阅读说明：本技术 一种城市轨道交通板式道岔结构的施工方法 (Construction method of plate type turnout structure of urban rail transit ) 是由 沈国芳 张明 文竹 鲁海龙 马海民 马鹏飞 王刚产 赵宗哲 李学亮 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种城市轨道交通板式道岔结构的施工方法,该方法包括：一、构建待施工轨道的轨道基础控制网；二、凿毛待施工板式道岔区的轨道基础；三、测量放样待施工板式道岔区的轨道中心线控制点和多个道岔板的道岔板安装边线；四、绑扎待施工板式道岔区的多个自密实混凝土板钢筋网；五、铺设待施工板式道岔区的道岔板拼装层；六、浇筑待施工板式道岔区的多个自密实混凝土板；七、安装待施工板式道岔区的道岔钢轨和扣件。本发明能够大大提高道岔板的精调精度,能够保证道岔板的拼装精度,同时,通过改善自密实混凝土的灌浆条件,能够提高自密实混凝土板的成型质量,从而提高板式道岔结构的施工质量。(The invention discloses a construction method of a plate type turnout structure of urban rail transit, which comprises the following steps: firstly, constructing a track foundation control network of a track to be constructed; secondly, chiseling a track foundation of a plate type turnout area to be constructed; thirdly, measuring a track central line control point of a lofting plate type turnout area to be constructed and turnout plate mounting side lines of a plurality of turnout plates; fourthly, binding a plurality of self-compacting concrete slab reinforcing steel bar meshes of the plate type turnout area to be constructed; fifthly, laying a turnout plate assembly layer of the plate type turnout area to be constructed; sixthly, pouring a plurality of self-compacting concrete slabs in the plate type turnout area to be constructed; seventhly, installing turnout steel rails and fasteners in the plate type turnout area to be constructed. The invention can greatly improve the fine adjustment precision of the turnout plate, can ensure the assembly precision of the turnout plate, and can improve the forming quality of the self-compacting concrete plate by improving the grouting condition of the self-compacting concrete, thereby improving the construction quality of the plate type turnout structure.)

1. A construction method of a plate type turnout structure of urban rail transit comprises a rail foundation (5), a self-compacting concrete layer laid on the rail foundation (5), a turnout plate assembly layer laid on the self-compacting concrete layer and turnout steel rails (1) installed on the turnout plate assembly layer through fasteners (2), wherein the self-compacting concrete layer comprises a plurality of self-compacting concrete plates (4) which are sequentially arranged, a self-compacting concrete plate reinforcing mesh (4-1) is arranged in each self-compacting concrete plate (4), the turnout plate assembly layer comprises a plurality of turnout plates (3) which are sequentially arranged, the turnout plates (3) correspond to the self-compacting concrete plates (4) one by one, grouting holes (3-1) and exhaust holes (3-2) are formed in the top surface of each turnout plate (3), hoisting holes (3-3) are formed in the left side face of the turnout plate (3) and the right side face of the turnout plate (3), and a plurality of nylon pipes (3-4) for mounting the fasteners (2) are pre-buried in the turnout plate (3); the method is characterized in that: the construction method comprises the following steps:

step one, constructing a track foundation control network of a track to be constructed:

step 101, constructing a track foundation control network of a track to be constructed by taking an existing elevation measurement control network and a GPS plane control network as references, wherein the track foundation control network comprises a plurality of pairs of track foundation control points (8) which are distributed at equal intervals along the length direction of the track to be constructed, and each pair of track foundation control points (8) comprises two track foundation control points (8) which are symmetrically distributed on the tunnel walls on the left side and the right side of the track to be constructed;

102, measuring and checking the precision of the track foundation control network to obtain the three-dimensional coordinates of each track foundation control point (8);

secondly, chiseling a track foundation (5) of the plate type turnout area to be constructed;

step three, measuring a track central line control point of the lofting plate type turnout zone to be constructed and turnout plate mounting side lines of a plurality of turnout plates:

301, taking the three-dimensional coordinates of a track foundation control point (8) in a plate type turnout area to be constructed as a reference, and performing measurement lofting of a track central line control point on the surface of a track foundation (5) in the plate type turnout area to be constructed;

step 302, taking the three-dimensional coordinates of a track foundation control point (8) in the plate type turnout zone to be constructed as a reference, and performing measurement lofting on turnout plate installation side lines of a plurality of turnout plates (3) on the surface of a track foundation (5) in the plate type turnout zone to be constructed; the number of the turnout plate installation side lines of any turnout plate (3) is four, the four turnout plate installation side lines form a turnout plate assembly area (7) together, the four turnout plate installation side lines are a turnout plate left side installation side line (6-1), a turnout plate right side installation side line (6-2), a turnout plate front side installation side line (6-3) and a turnout plate rear side installation side line (6-4), the vertical distance between the turnout plate left side installation side line (6-1) and the left side face of the turnout plate (3) is recorded as a left side installation side line offset distance L1, the vertical distance between the turnout plate right side installation side line (6-2) and the right side face of the turnout plate (3) is recorded as a right side installation side line offset distance L2, and L2 is recorded as L1; the vertical distance between the front side mounting edge line (6-3) of the turnout plate and the front side face of the turnout plate (3) is recorded as a front side mounting edge line offset distance L3, the vertical distance between the rear side mounting edge line (6-4) of the turnout plate and the rear side face of the turnout plate (3) is recorded as a rear side mounting edge line offset distance L4, and L4 is equal to L3 and equal to 0;

step four, binding a plurality of self-compacting concrete slab reinforcing steel bar meshes of the plate type turnout area to be constructed:

a plurality of self-compacting concrete slab reinforcing mesh (4-1) are respectively bound in the turnout slab assembling areas (7), and the height of the self-compacting concrete slab reinforcing mesh (4-1) is adjusted by adopting a mode of arranging a plurality of cushion blocks under the self-compacting concrete slab reinforcing mesh (4-1), so that the self-compacting concrete slab reinforcing mesh (4-1) is positioned in the middle of the self-compacting concrete slab (4);

step five, laying a turnout plate assembly layer of a plate turnout area to be constructed:

the installation method of the multiple turnout plates (3) in the turnout plate assembly layer is the same, and the installation method of any turnout plate (3) specifically comprises the following steps:

step 501, preliminarily positioning a turnout plate:

the turnout slab is characterized in that a lifting device and a conveying device are adopted to convey the turnout slab (3) to a turnout slab assembling area (7), four temporary supports are respectively placed at four corners of a self-compacting concrete slab reinforcing mesh (4-1) in the turnout slab assembling area (7), and the heights of the temporary supports are higher than that of the self-compacting concrete slab reinforcing mesh (4-1); then, taking the four installation edge lines of the turnout plate for lofting measurement in the step 302 as initial positioning reference lines of the turnout plate (3), and placing the turnout plate (3) on the four temporary supports;

step 502, roughly adjusting a turnout plate:

installing three-way regulators (11) in the hoisting holes (3-3), roughly adjusting the plane positions of the turnout plates (3) by using four turnout plate installation sidelines for lofting measured in the step 302 as rough adjustment reference lines of the turnout plates (3) and using at least two three-way regulators (11) to respectively measure a left side installation sideline offset distance L1, a right side installation sideline offset distance L2, a front side installation sideline offset distance L3 and a rear side installation sideline offset distance L4, and stopping the rough adjustment plates (3) when the size deviation of the left side installation sideline offset distance L1, the size deviation of the right side installation sideline offset distance L2, the size deviation of the front side installation sideline offset distance L3 and the size deviation of the rear side installation turnout offset distance L4 are not more than +/-5 mm;

step 503, fine adjustment of the turnout plate:

step 5031, installing prisms (9) in nylon pipes (3-4) at four corners of a turnout plate (3), and measuring three-dimensional coordinates of the four prisms (9) by using a total station instrument with a three-dimensional coordinate of a track basic control point (8) at a plate type turnout area to be constructed as a reference to obtain three-dimensional measured coordinates of the four corners of the turnout plate (3);

step 5032, comparing the three-dimensional measured coordinates of the four corners of the turnout plate (3) with the three-dimensional design coordinates of the four corners of the turnout plate (3) in real time by using a computer, and finely adjusting the elevation position and the plane position of the turnout plate (3) by using at least two three-way regulators (11); the adjustment sequence of the elevation position and the plane position of the fine adjustment turnout plate (3) is as follows: the elevation position of the turnout plate (3) is adjusted firstly by adopting a diagonal adjustment mode, and then the plane position of the turnout plate (3) is adjusted;

when the size deviation between the three-dimensional measured coordinate of any one of the three-dimensional measured coordinates of the four corners of the turnout plate (3) and the set three-dimensional design coordinate exceeds +/-1 mm, continuing to finely adjust the turnout plate (3); when the size deviation between the three-dimensional measured coordinates of the four corners in the three-dimensional measured coordinates of the four corners of the turnout plate (3) and the set three-dimensional design coordinates does not exceed +/-1 mm, stopping fine adjustment of the turnout plate (3), and detaching the four prisms (9);

step six, pouring a plurality of self-compacting concrete slabs in the plate type turnout area to be constructed:

the pouring method of a plurality of self-compacting concrete slabs (4) is the same, and the pouring method of any self-compacting concrete slab (4) comprises the following steps:

601, arranging a self-compacting concrete slab forming template assembly around the periphery of a self-compacting concrete slab reinforcing mesh (4-1) to form a self-compacting concrete pouring cavity between the self-compacting concrete slab forming template assembly and a turnout slab (3);

the self-compacting concrete slab forming template assembly comprises four side templates, wherein two adjacent side templates are formed by corner templates (10-3), and an exhaust pipe (10-3-1) is arranged on each corner template (10-3);

step 602, installing a flow guide pipe (12) in the grouting hole (3-1), and pouring self-compacting concrete into the flow guide pipe (12) by using a grouting device to form a self-compacting concrete slab (4);

step seven, installing turnout steel rails and fasteners in the plate turnout area to be constructed:

and after the strength of the self-compacting concrete slabs (4) poured in the sixth step reaches more than 70% of the design strength, dismantling the self-compacting concrete slab forming formwork assembly and the three-way regulator (11), and then installing turnout steel rails (1) and fasteners (2) on the upper surface of the turnout slab assembly layer to complete the construction of the plate type turnout structure of the plate type turnout area to be constructed.

2. The construction method of the urban rail transit plate type turnout structure according to claim 1, characterized in that: in step 602, the grouting device comprises a grouting funnel (13) connected with the draft tube (12), a chute (15) arranged above the grouting funnel (13), and a hopper mixer for pouring self-compacting concrete into the chute (15), the hopper mixer comprises a frame (17), a hopper (18) arranged on the frame (17) and a stirring mechanism arranged in the hopper (18), the stirring mechanism comprises a fixed frame (19-1) fixedly arranged at the top end of the hopper (18), a motor (19-2) fixedly arranged on the fixed frame (19-1) and a stirring paddle (19-3) driven by the motor (19-2), a first bracket (14) for supporting is arranged at the bottom of the grouting funnel (13), the bottom of the chute (15) is provided with a second bracket (16) for supporting.

3. The construction method of the urban rail transit plate type turnout structure according to claim 2, characterized in that: in step 602, the temperature of the self-compacting concrete poured into the draft tube (12) ranges from 5 ℃ to 25 ℃, and the height of the draft tube (12) ranges from 0.5m to 1 m.

4. The construction method of the urban rail transit plate type turnout structure according to claim 1, characterized in that: the offset distance L1 of the left side installation sideline and the offset distance L2 of the right side installation sideline are positive integers, and the value range of the offset distance L1 of the left side installation sideline and the value range of the offset distance L2 of the right side installation sideline are both 90 mm-150 mm.

Technical Field

The invention belongs to the technical field of urban rail transit engineering, and particularly relates to a construction method of an urban rail transit plate type turnout structure.

Background

In an urban railway line, construction of a turnout structure is a weak link of urban railway construction. In the construction of traditional subway switch and whole railway roadbed, mainly adopt the mode shaping subway switch and whole railway roadbed of cast in situ, not only polluted the environment, made the noise, still increased workman's intensity of labour, the construction operation environment is poor, and the quality control means is relatively weak. At present, a plate type turnout structure and a plate type track bed structure are commonly used in a ballastless track, the structural forms of a plurality of track plates in the plate type track bed structure are the same, the size is small, the weight is light, the transportation and the adjustment are convenient, and the structural forms of a plurality of turnout plates in the plate type turnout structure are different, and the size and the weight are different, so that the installation precision of the turnout plates is not convenient to adjust in the process of assembling the turnout plates, the turnout plates are difficult to adjust in place quickly and accurately by adopting a traditional turnout plate fine adjustment mode, and the construction period is influenced; meanwhile, when a self-compacting concrete layer below the turnout slab is cast and formed in situ, one-time casting is required, and multiple times of casting cannot be performed, and due to the fact that the casting area of the self-compacting concrete layer is large, the traditional method of pumping concrete is adopted, the phenomena of non-compact casting, pipe blockage, pipe explosion and the like are easy to occur, and the engineering quality is influenced; therefore, the construction method of the urban rail transit plate type turnout structure capable of improving the turnout plate assembling precision is provided.

Disclosure of Invention

The invention aims to solve the technical problem that the defects in the prior art are overcome, and provides a construction method of an urban rail transit plate type turnout structure, which is simple in structure and reasonable in design, the precision of a rail foundation control net is checked through measurement, the elevation position and the plane position of the turnout plate are finely adjusted by using a three-way adjuster based on the three-dimensional coordinate of a rail foundation control point in a plate type turnout area to be constructed, the fine adjustment precision of the turnout plate can be greatly improved, the assembly precision of the turnout plate can be ensured, and meanwhile, the forming quality of the self-compacting concrete plate can be improved through improving the grouting condition of the self-compacting concrete, so that the construction quality of the plate type turnout structure is improved.

In order to solve the technical problems, the invention adopts the technical scheme that: a construction method of an urban rail transit plate type turnout structure comprises a rail foundation, a self-compacting concrete layer laid on the rail foundation, a turnout plate assembly layer laid on the self-compacting concrete layer and turnout steel rails installed on the turnout plate assembly layer through fasteners, wherein the self-compacting concrete layer comprises a plurality of self-compacting concrete plates which are sequentially arranged, a self-compacting concrete plate reinforcing mesh is arranged in each self-compacting concrete plate, the turnout plate assembly layer comprises a plurality of turnout plates which are sequentially arranged, the turnout plates correspond to the self-compacting concrete plates one by one, grouting holes and exhaust holes are formed in the top surface of each turnout plate, hoisting holes are formed in the left side surface of each turnout plate and the right side surface of each turnout plate, and a plurality of nylon pipes for installing fasteners are pre-embedded in each turnout plate; the method is characterized in that: the construction method comprises the following steps:

step one, constructing a track foundation control network of a track to be constructed:

step 101, constructing a track foundation control network of a track to be constructed by taking an existing elevation measurement control network and a GPS plane control network as references, wherein the track foundation control network comprises a plurality of pairs of track foundation control points which are distributed at equal intervals along the length direction of the track to be constructed, and each pair of track foundation control points comprises two track foundation control points which are symmetrically distributed on the tunnel walls at the left side and the right side of the track to be constructed;

102, measuring and checking the precision of the track foundation control network to obtain a three-dimensional coordinate of each track foundation control point;

secondly, chiseling a track foundation of a plate type turnout area to be constructed;

step three, measuring a track central line control point of the lofting plate type turnout zone to be constructed and turnout plate mounting side lines of a plurality of turnout plates:

step 301, taking the three-dimensional coordinates of the track foundation control points in the plate type turnout area to be constructed as a reference, and performing measurement lofting on the track central line control points on the surface of the track foundation in the plate type turnout area to be constructed;

step 302, taking the three-dimensional coordinates of the track foundation control points in the plate type turnout zone to be constructed as a reference, and performing measurement lofting on turnout plate installation sidelines of a plurality of turnout plates on the surface of the track foundation in the plate type turnout zone to be constructed; the number of the turnout plate mounting edge lines of any turnout plate is four, the four turnout plate mounting edge lines form a turnout plate assembly area together, the four turnout plate mounting edge lines are respectively a turnout plate left side mounting edge line, a turnout plate right side mounting edge line, a turnout plate front side mounting edge line and a turnout plate rear side mounting edge line, the vertical distance between the turnout plate left side mounting edge line and the left side surface of the turnout plate is recorded as a left side mounting edge line offset distance L1, the vertical distance between the turnout plate right side mounting edge line and the right side surface of the turnout plate is recorded as a right side mounting edge line offset distance L2, and L2 is recorded as L1; the vertical distance between the front side installation sideline of the turnout plate and the front side surface of the turnout plate is recorded as a front side installation sideline offset distance L3, the vertical distance between the rear side installation sideline of the turnout plate and the rear side surface of the turnout plate is recorded as a rear side installation sideline offset distance L4, and L4 is equal to L3 is equal to 0;

step four, binding a plurality of self-compacting concrete slab reinforcing steel bar meshes of the plate type turnout area to be constructed:

respectively binding a plurality of self-compacting concrete slab reinforcing steel bar meshes in the turnout slab splicing areas, and adjusting the heights of the self-compacting concrete slab reinforcing steel bar meshes in a mode of supporting a plurality of cushion blocks under the self-compacting concrete slab reinforcing steel bar meshes so that the self-compacting concrete slab reinforcing steel bar meshes are positioned in the middle of the self-compacting concrete slab;

step five, laying a turnout plate assembly layer of a plate turnout area to be constructed:

the installation method of a plurality of turnout plates in the turnout plate assembly layer is the same, and the installation method of any turnout plate specifically comprises the following steps:

step 501, preliminarily positioning a turnout plate:

transporting the turnout slab to a turnout slab assembling area by adopting hoisting equipment and transportation equipment, and respectively placing four temporary supports at four corners of a self-compacting concrete slab reinforcing mesh in the turnout slab assembling area, wherein the heights of the temporary supports are higher than that of the self-compacting concrete slab reinforcing mesh; then, taking the four installation edge lines of the turnout plate for lofting measurement in the step 302 as initial positioning reference lines of the turnout plate, and placing the turnout plate on the four temporary supports;

step 502, roughly adjusting a turnout plate:

installing three-way regulators in the hoisting holes, roughly adjusting the plane positions of the turnout plates by taking the four turnout plate installation sidelines for lofting measured in the step 302 as rough adjustment reference lines of the turnout plates, respectively measuring a left side installation sideline offset distance L1, a right side installation sideline offset distance L2, a front side installation sideline offset distance L3 and a rear side installation sideline offset distance L4 by using a triangular steel plate ruler, and stopping roughly adjusting the turnout plates when the size deviation of the left side installation sideline offset distance L1, the size deviation of the right side installation sideline offset distance L2, the size deviation of the front side installation sideline offset distance L3 and the size deviation of the rear side installation sideline offset distance L4 are not more than +/-5 mm;

step 503, fine adjustment of the turnout plate:

step 5031, arranging prisms in nylon tubes at four corners of a turnout plate, and measuring three-dimensional coordinates of the four prisms by using a total station to obtain three-dimensional measured coordinates of the four corners of the turnout plate by taking the three-dimensional coordinates of a track foundation control point in a plate turnout area to be constructed as a reference;

step 5032, comparing the three-dimensional measured coordinates of the four corners of the turnout plate with the three-dimensional design coordinates of the four corners of the turnout plate in real time by using a computer, and finely adjusting the elevation position and the plane position of the turnout plate by using at least two three-way adjusters; the adjusting sequence of the elevation position and the plane position of the fine adjustment turnout plate is as follows: firstly, adjusting the elevation position of the turnout plate and then adjusting the plane position of the turnout plate in a diagonal adjustment mode;

when the size deviation between the three-dimensional measured coordinate of any one of the four three-dimensional measured coordinates of the turnout plate and the set three-dimensional design coordinate exceeds +/-1 mm, continuing to finely adjust the turnout plate; when the size deviation between the three-dimensional measured coordinates of the four corners in the three-dimensional measured coordinates of the four corners of the turnout plate and the set three-dimensional design coordinates of the turnout plate does not exceed +/-1 mm, stopping fine adjustment of the turnout plate, and detaching the four prisms;

step six, pouring a plurality of self-compacting concrete slabs in the plate type turnout area to be constructed:

the pouring method of a plurality of self-compacting concrete slabs is the same, and the pouring method of any self-compacting concrete slab comprises the following steps:

601, arranging a self-compacting concrete slab forming template assembly around the periphery of a reinforcing mesh of a self-compacting concrete slab, so that a self-compacting concrete pouring cavity is formed between the self-compacting concrete slab forming template assembly and a turnout slab;

the self-compacting concrete slab forming template assembly comprises four side templates, wherein two adjacent side templates are formed by corner templates, and the corner templates are provided with exhaust pipes;

step 602, installing a flow guide pipe in the grouting hole, pouring self-compacting concrete into the flow guide pipe by using a grouting device, and forming a self-compacting concrete slab;

step seven, installing turnout steel rails and fasteners in the plate turnout area to be constructed:

and after the strength of the self-compacting concrete slabs poured in the sixth step reaches more than 70% of the design strength, removing the self-compacting concrete slab forming die plate component and the three-way regulator, and then installing turnout steel rails and fasteners of the plate type turnout area to be constructed on the upper surface of the turnout plate assembly layer to complete the construction of the plate type turnout structure of the plate type turnout area to be constructed.

The construction method of the plate type turnout structure of the urban rail transit is characterized by comprising the following steps of: in step 602, the cementer including be used for with honeycomb duct connection's grout funnel, setting are in the chute of grout funnel top with be used for to the hopper mixer of self-compaction concrete pours in the chute, the hopper mixer includes the frame, installs hopper in the frame is with installing rabbling mechanism in the hopper, rabbling mechanism includes fixed mounting and is in mount, the fixed mounting on hopper top motor on the mount and by motor drive's stirring rake, the bottom of grout funnel is provided with the first support that is used for the support, the bottom of chute is provided with the second support that is used for the support.

The construction method of the plate type turnout structure of the urban rail transit is characterized by comprising the following steps of: in step 602, the temperature of the self-compacting concrete poured into the draft tube ranges from 5 ℃ to 25 ℃, and the height of the draft tube 12 ranges from 0.5m to 1 m.

The construction method of the plate type turnout structure of the urban rail transit is characterized by comprising the following steps of: the offset distance L1 of the left side installation sideline and the offset distance L2 of the right side installation sideline are positive integers, and the value range of the offset distance L1 of the left side installation sideline and the value range of the offset distance L2 of the right side installation sideline are both 90 mm-150 mm.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the precision of the track foundation control network is measured and checked to obtain the high-precision track foundation control network, the precision of the measurement lofting of the track central line control point and the turnout plate installation sidelines of a plurality of turnout plates can be improved, the accurate three-dimensional coordinates of the track foundation control point can be provided for the fine adjustment of the turnout plates, and the splicing precision of the turnout plates can be ensured.

2. The invention obtains the three-dimensional measured coordinates of four corners of the turnout plate by adopting the total station to measure the three-dimensional coordinates of four prisms, and when the elevation position and the plane position of the turnout plate are finely adjusted, the three-dimensional coordinates of the track basic control point positioned in the turnout area of the plate to be constructed are taken as a reference, so that the fine adjustment precision of the turnout plate can be greatly improved.

3. According to the invention, the exhaust pipes are arranged on the corner template, when the self-compacting concrete is poured, gas in the self-compacting concrete pouring cavity can be exhausted through the four exhaust pipes, so that the flow of the self-compacting concrete in the self-compacting concrete pouring cavity is facilitated, the incomplete pouring of the four corners in the self-compacting concrete pouring cavity can not occur, the forming quality of the self-compacting concrete slab is improved, and the pouring method of the self-compacting concrete slab is refined.

4. The construction method has simple flow and reasonable design, reduces the construction difficulty and is convenient for popularization and application.

In conclusion, the track foundation control net has a simple structure and a reasonable design, the precision of the track foundation control net is measured and checked, the three-dimensional coordinates of the track foundation control points in the plate type turnout zone to be constructed are taken as the reference, the elevation position and the plane position of the turnout plate are finely adjusted by the three-way regulator, the fine adjustment precision of the turnout plate can be greatly improved, the assembly precision of the turnout plate can be ensured, and meanwhile, the forming quality of the self-compacting concrete plate can be improved by improving the grouting condition of the self-compacting concrete, so that the construction quality of the plate type turnout structure is improved.

The invention is described in further detail below with reference to the figures and examples.

Drawings

FIG. 1 is a flow chart of the construction method of the present invention.

Fig. 2 is a schematic structural diagram of the plate type turnout structure of the invention.

Fig. 3 is a schematic view of the installation relationship of multiple turnout plates according to the present invention.

Fig. 4 is a schematic diagram of the position relationship between any one of the switch plates and the mounting edge line of the switch plate for lofting measurement.

Fig. 5 is a schematic view of the installation relationship of any switch plate and prism of the present invention.

Fig. 6 is a schematic view of the use state of the self-compacting concrete layer formed by pouring according to the present invention.

Description of reference numerals:

1-turnout steel rail; 2, a fastener; 3, a turnout plate;

3-1-grouting holes; 3-2-exhaust holes; 3-lifting hole;

3-4-nylon tube; 4-self-compacting concrete slabs;

4-1-self-compacting concrete slab reinforcing mesh; 5, a track foundation;

6-1, installing a sideline on the left side of the turnout plate; 6-2-installing a sideline on the right side of the turnout plate;

6-3, installing a sideline on the front side of the turnout plate; 6-4, installing a sideline at the rear side of the turnout plate;

7-a turnout slab laying area; 8-track base control points; 9-a prism;

10-1-sideform; 10-3-corner template; 10-3-1-vent-pipe;

11-three-way regulator; 12-a flow guide pipe; 13-grouting hopper;

14 — a first support; 15-chute; 16 — a second support;

17-a frame; 17-1-lifting ear plates; 18-a hopper;

19-1-a mount; 19-2-motor; 19-3-stirring paddle;

20-a steel wire rope; 21-drainage ditch.

Detailed Description

As shown in fig. 1 to 5, the construction method of the plate type turnout structure of the urban rail transit comprises a rail foundation 5, a self-compacting concrete layer laid on the rail foundation 5, a turnout plate assembly layer laid on the self-compacting concrete layer and a turnout steel rail 1 installed on the turnout plate assembly layer through a fastener 2, wherein the self-compacting concrete layer comprises a plurality of self-compacting concrete plates 4 which are sequentially laid, a self-compacting concrete plate reinforcing mesh 4-1 is arranged in each self-compacting concrete plate 4, the turnout plate assembly layer comprises a plurality of turnout plates 3 which are sequentially laid, the turnout plates 3 are in one-to-one correspondence with the self-compacting concrete plates 4, grouting holes 3-1 and exhaust holes 3-2 are arranged on the top surface of each turnout plate 3, hoisting holes 3-3 are arranged on the left side surface of each turnout plate 3 and the right side surface of each turnout plate 3, a plurality of nylon pipes 3-4 for installing the fasteners 2 are pre-embedded on the turnout plate 3; the construction method comprises the following steps:

as shown in fig. 1 and 3, step one, constructing a track foundation control network of a track to be constructed:

step 101, constructing a track foundation control network of a track to be constructed by taking an existing elevation measurement control network and a GPS plane control network as references, wherein the track foundation control network comprises a plurality of pairs of track foundation control points 8 which are distributed at equal intervals along the length direction of the track to be constructed, and each pair of track foundation control points 8 comprises two track foundation control points 8 which are symmetrically distributed on the tunnel walls at the left side and the right side of the track to be constructed;

102, measuring and checking the precision of the track foundation control network to obtain a three-dimensional coordinate of each track foundation control point 8;

in this embodiment, through measuring the check to the precision of track basis control network, can realize laying the purpose of high accuracy track basis control network, can improve the precision of the turnout board installation sideline measurement lofting of track central line control point and a plurality of turnout boards, can provide accurate track basis control point 8's three-dimensional coordinate for the fine tuning of turnout board, can guarantee the precision of assembling of turnout board.

Secondly, chiseling a track foundation 5 of the plate type turnout area to be constructed;

in this embodiment, before the switch board installation sideline of measurement laying-out track central line control point and a plurality of switch board, need treat the track basis 5 in construction board formula switch district and chisel hair, the track basis 5 after the chisel hair on the surface shaping self-compaction concrete layer, help being connected between self-compaction concrete layer and the track basis 5, during the in-service use, after utilizing the air compressor machine to chisel hair to track basis 5, still need clear up the surface of track basis 5 makes the surface of track basis 5 is clean and tidy, no debris.

Step three, measuring a track central line control point of the lofting plate type turnout zone to be constructed and turnout plate mounting side lines of a plurality of turnout plates:

step 301, taking the three-dimensional coordinates of a track foundation control point 8 in a plate type turnout area to be constructed as a reference, and performing measurement lofting of a track central line control point on the surface of a track foundation 5 in the plate type turnout area to be constructed;

as shown in fig. 4, step 302, taking the three-dimensional coordinates of the track foundation control points 8 in the plate type turnout zone to be constructed as the reference, and performing measurement lofting of the turnout plate installation sidelines of the multiple turnout plates 3 on the surface of the track foundation 5 in the plate type turnout zone to be constructed; the number of the turnout plate installation edge lines of any turnout plate 3 is four, the four turnout plate installation edge lines form a turnout plate assembly area 7 together, the four turnout plate installation edge lines are a turnout plate left side installation edge line 6-1, a turnout plate right side installation edge line 6-2, a turnout plate front side installation edge line 6-3 and a turnout plate rear side installation edge line 6-4 respectively, the vertical distance between the turnout plate left side installation edge line 6-1 and the left side face of the turnout plate 3 is recorded as a left side installation edge line offset distance L1, the vertical distance between the turnout plate right side installation edge line 6-2 and the right side face of the turnout plate 3 is recorded as a right side installation edge line offset distance L2, and L2 is equal to L1; the vertical distance between the front side installation sideline 6-3 of the turnout plate and the front side surface of the turnout plate 3 is recorded as a front side installation sideline offset distance L3, the vertical distance between the rear side installation sideline 6-4 of the turnout plate and the rear side surface of the turnout plate 3 is recorded as a rear side installation sideline offset distance L4, and L4 is equal to L3 is equal to 0;

in this embodiment, when ligature a plurality of self-compaction concrete slab reinforcing bar net 4-1 and assemble a plurality of switch board 3, the track center line control point of all needing to measure the loft and the switch board installation sideline of a plurality of switch board are as the datum line, because the quantity of any switch board 3's switch board installation sideline is four, and four switch board installation sideline forms a switch board jointly and assembles district 7, can guarantee the mounted position of a plurality of self-compaction concrete slab reinforcing bar net 4-1, can confirm the precision of assembling of switch board 3.

Step four, binding a plurality of self-compacting concrete slab reinforcing steel bar meshes of the plate type turnout area to be constructed:

respectively binding a plurality of self-compacting concrete slab reinforcing mesh 4-1 in the turnout slab assembling areas 7, and adjusting the height of the self-compacting concrete slab reinforcing mesh 4-1 in a mode of arranging a plurality of cushion blocks under the self-compacting concrete slab reinforcing mesh 4-1 so as to enable the self-compacting concrete slab reinforcing mesh 4-1 to be positioned in the middle of the self-compacting concrete slab 4;

in the embodiment, the strength and the stability of the self-compacting concrete slab 4 can be improved by arranging the self-compacting concrete slab reinforcing mesh 4-1, and the self-compacting concrete slab reinforcing mesh 4-1 can be positioned in the middle of the self-compacting concrete slab 4 by arranging a plurality of cushion blocks under the self-compacting concrete slab reinforcing mesh 4-1 on a turnout slab assembly layer of a plate turnout area to be constructed and adjusting the height of the self-compacting concrete slab reinforcing mesh 4-1;

step five, laying a turnout plate assembly layer of a plate turnout area to be constructed:

as shown in fig. 1, 2 and 3, the installation methods of the multiple switch plates 3 in the switch plate assembly layer are the same, and the installation method of any switch plate 3 specifically includes the following steps:

step 501, preliminarily positioning a turnout plate:

the turnout slab 3 is transferred to a turnout slab assembling area 7 by adopting hoisting equipment and transportation equipment, four temporary supports are respectively placed at four corners of a self-compacting concrete slab reinforcing mesh 4-1 in the turnout slab assembling area 7, and the heights of the temporary supports are higher than that of the self-compacting concrete slab reinforcing mesh 4-1; then, taking the four installation edge lines of the turnout plate for lofting measurement in the step 302 as initial positioning reference lines of the turnout plate 3, and placing the turnout plate 3 on the four temporary supports;

in this embodiment, four temporary supports are respectively placed at four corners of the self-compacting concrete slab mesh reinforcement 4-1, and since the height of the temporary supports is higher than that of the self-compacting concrete slab mesh reinforcement 4-1, when the turnout slab 3 is placed on four temporary supports, the turnout slab 3 is jointly supported by the four temporary supports, and the turnout slab 3 does not contact with the self-compacting concrete slab mesh reinforcement 4-1, so that the self-compacting concrete slab mesh reinforcement 4-1 is prevented from being inclined, and the forming quality of the self-compacting concrete slab 4 is ensured.

Step 502, roughly adjusting a turnout plate:

as shown in fig. 4, 5 and 6, installing three-way regulators 11 in the hoisting holes 3-3, roughly adjusting the plane positions of the turnout plates 3 by using the four turnout plate installation sidelines for lofting measured in step 302 as rough adjustment reference lines of the turnout plates 3, using at least two three-way regulators 11 to roughly adjust the plane positions of the turnout plates 3, respectively measuring a left side installation sideline offset distance L1, a right side installation sideline offset distance L2, a front side installation sideline offset distance L3 and a rear side installation sideline offset distance L4 by using triangular steel plate rulers, and stopping the rough adjustment of the turnout plates 3 when the size deviation of the left side installation sideline offset distance L1, the size deviation of the right side installation sideline offset distance L2, the size deviation of the front side installation sideline offset distance L3 and the size deviation of the rear side installation sideline offset distance L4 are not more than ± 5 mm;

when the three-way adjuster is in actual use, the connecting piece is installed in the hoisting hole 3-3, the compaction piece is placed on the surface of the track foundation 5, the vertical displacement adjusting piece is manually screwed, and the vertical elevation of the plate 3 can be adjusted; manually screwing a first adjusting bolt, and adjusting the turnout plate 3 at the longitudinal position along the axial direction of the first adjusting bolt; manual second adjusting bolt of revolving soon can adjust switch board 3 at the transverse position along second adjusting bolt's axial direction, consequently, utilizes three-way regulator 11 can realize the regulation to switch board 3 about, around, about three side, easy operation, it is more convenient to adjust, excellent in use effect.

In this embodiment, the number of the lifting holes 3-3 on the left side surface of the turnout plate 3 is two, the number of the lifting holes 3-3 on the right side surface of the turnout plate 3 is two, and the two lifting holes 3-3 on the left side surface of the turnout plate 3 correspond to the two lifting holes 3-3 on the right side surface of the turnout plate 3, so that when the turnout plate 3 is roughly adjusted, four turnout plate installation side lines for lofting measured in the step 302 are used as rough adjustment reference lines of the turnout plate 3, and the four three-way regulators 11 are adopted for simultaneous adjustment, so that the assembly precision and the assembly efficiency of the turnout plate 3 can be improved.

Step 503, fine adjustment of the turnout plate:

as shown in fig. 5, in step 5031, installing prisms 9 in nylon pipes 3-4 at four corners of a turnout plate 3, and measuring three-dimensional coordinates of the four prisms 9 by using a total station to obtain three-dimensional measured coordinates of the four corners of the turnout plate 3 with reference to three-dimensional coordinates of a track basic control point 8 at a plate turnout area to be constructed;

step 5032, comparing the three-dimensional measured coordinates of the four corners of the turnout plate 3 with the three-dimensional design coordinates of the four corners of the turnout plate 3 in real time by using a computer, and finely adjusting the elevation position and the plane position of the turnout plate 3 by using at least two three-way adjusters 11; the adjustment sequence of the elevation position and the plane position of the fine adjustment turnout plate 3 is as follows: firstly, adjusting the elevation position of the turnout plate 3 and then adjusting the plane position of the turnout plate 3 in a diagonal adjustment mode;

when the size deviation between the three-dimensional measured coordinate of any one of the three-dimensional measured coordinates of the four corners of the turnout plate 3 and the set three-dimensional design coordinate exceeds +/-1 mm, continuing to finely adjust the turnout plate 3; when the size deviation between the three-dimensional measured coordinates of the four corners in the three-dimensional measured coordinates of the four corners of the turnout plate 3 and the set three-dimensional design coordinates does not exceed +/-1 mm, stopping fine adjustment of the turnout plate 3, and removing the four prisms 9;

in this embodiment, the three-dimensional coordinates of the four prisms 9 are measured by the total station, the three-dimensional measured coordinates of the four corners of the switch board 3 are obtained, compared with the prior art, because the accuracy of the track basic control network is checked by measuring in step 102, the position accuracy of each track basic control point 8 is improved, therefore, when the elevation position and the plane position of the switch board 3 are finely adjusted, the three-dimensional coordinates of the track basic control points 8 located in the to-be-constructed plate type switch area are taken as the reference, the fine adjustment accuracy of the switch board 3 can be greatly improved, meanwhile, through multiple times of measurement, when the diagonal adjustment mode is adopted, the elevation position of the switch board 3 is adjusted first, and then the plane position of the switch board 3 is adjusted, the switch board 3 can be finely adjusted in place quickly, and the working efficiency is improved.

Step six, pouring a plurality of self-compacting concrete slabs in the plate type turnout area to be constructed:

the pouring method of a plurality of self-compacting concrete slabs 4 is the same, and the pouring method of any self-compacting concrete slab 4 comprises the following steps:

as shown in fig. 6, step 601, arranging a self-compacting concrete slab forming formwork assembly around the periphery of the self-compacting concrete slab reinforcing mesh 4-1, so as to form a self-compacting concrete pouring cavity between the self-compacting concrete slab forming formwork assembly and the turnout slab 3;

the self-compacting concrete slab forming template assembly comprises four side templates, two adjacent side templates are formed by corner templates 10-3, and an exhaust pipe 10-3-1 is arranged on each corner template 10-3;

in this embodiment, the four side formworks are a front side formwork 10-1, a rear side formwork, a left side formwork 10-2 and a right side formwork respectively, the front side formwork 10-1, the rear side formwork and the right side formwork are straight rectangular formworks, and the left side formwork 10-2 is an arc formwork matched with the left side surface of the turnout plate 3.

In the embodiment, the exhaust pipe 10-3-1 is arranged on the corner template 10-3, so that when the self-compacting concrete is poured, gas in a self-compacting concrete pouring cavity can be exhausted through the four exhaust pipes 10-3-1, the flow of the self-compacting concrete in the self-compacting concrete pouring cavity is facilitated, the incomplete pouring phenomenon of four corners in the self-compacting concrete pouring cavity can not occur, and the forming quality of the self-compacting concrete plate 4 is improved.

Step 602, installing a flow guide pipe 12 in a grouting hole 3-1, pouring self-compacting concrete into the flow guide pipe 12 by using a grouting device, and forming a self-compacting concrete plate 4;

step seven, installing turnout steel rails and fasteners in the plate turnout area to be constructed:

and after the strength of the self-compacting concrete slabs 4 poured in the sixth step reaches more than 70% of the design strength, removing the self-compacting concrete slab forming die plate component and the three-way regulator 11, and then installing turnout steel rails 1 and fasteners 2 on the upper surface of the turnout plate assembly layer to complete the construction of the plate type turnout structure of the plate type turnout area to be constructed.

As shown in fig. 2, in this embodiment, after the construction of the plate type turnout structure of the plate type turnout area to be constructed is completed, the drainage ditch 21 located at both sides of the plate type turnout is cast and formed.

In this embodiment, as shown in fig. 6, in step 602, the grouting device includes a grouting funnel 13 connected to the draft tube 12, a chute 15 disposed above the grouting funnel 13, and a hopper mixer for pouring self-compacting concrete into the chute 15, the hopper mixer includes a frame 17, a hopper 18 mounted on the frame 17, and a stirring mechanism mounted in the hopper 18, the stirring mechanism includes a fixed frame 19-1 fixedly mounted at a top end of the hopper 18, a motor 19-2 fixedly mounted on the fixed frame 19-1, and a stirring paddle 19-3 driven by the motor 19-2, the bottom of the grouting funnel 13 is provided with a first support 14 for supporting, and the bottom of the chute 15 is provided with a second support 16 for supporting.

When urban rails are constructed in a tunnel, when concrete pumping equipment is used for pouring self-compacting concrete, the concrete pumping equipment cannot enter the tunnel, a long-distance pumping pipeline is needed, the phenomena of non-compact pouring, pipe blockage, pipe explosion and the like are easy to occur, so that the pouring of the self-compacting concrete cannot be continuously carried out, and the forming quality of the self-compacting concrete plate 4 is influenced, therefore, in the embodiment, the grouting device comprises a grouting funnel 13, a chute 15 and a hopper mixer, the hopper mixer comprises a frame 17, a hopper 18 and a stirring mechanism, when the self-compacting concrete pouring device is actually used, the grouting funnel 13 is supported on the top surface of the turnout plate 3 by a first support 14, the chute 15 is supported on the top surface of the turnout plate 3 by a second support 16, the bottom end of the grouting funnel 13 is connected with a guide pipe 12, the self-compacting concrete is formed by stirring and mixing in the hopper mixer, then the hopper mixer is lifted to the position above the chute, and to chute 15 internal inclination self-compaction concrete, self-compaction concrete circulates to the grout funnel 13 in through chute 15, circulates to honeycomb duct 12 in by the grout funnel 13 in to get into the self-compaction concrete pouring intracavity, need not adopt long distance pump sending pipeline, be difficult to appear pouring phenomenons such as incompact, stifled pipe, explosion, and the grout is effectual, convenient to popularize and apply.

In this embodiment, the range of the inclination angle of the chute 15 is 10 ° to 15 °.

In actual use, when the inclination angle of the chute 15 is smaller than 10 degrees, the speed of the self-compacting concrete flowing into the grouting hopper 13 through the chute 15 is slow, and the self-compacting concrete deposition phenomenon is easy to occur in the chute 15; when the inclination of chute 15 was greater than 15, the accumulational phenomenon of self-compaction concrete easily appeared in grout funnel 13, all is not favorable to the grout of self-compaction concrete, influences the shaping quality of self-compaction concrete slab 4.

As shown in fig. 6, in this embodiment, a hoisting ear plate 17-1 for installing a steel cable 20 is disposed on the frame 17.

In this embodiment, in step 602, the temperature of the self-compacting concrete poured into the draft tube 12 ranges from 5 ℃ to 25 ℃, and the height of the draft tube 12 ranges from 0.5m to 1 m.

In this embodiment, the temperature of the self-compacting concrete poured into the draft tube 12 ranges from 5 ℃ to 25 ℃, which is because: when the temperature of the self-compacting concrete is less than 5 ℃, the flowing of the self-compacting concrete is not facilitated, and when the temperature of the self-compacting concrete is more than 25 ℃, the forming of the self-compacting concrete plate 4 is not facilitated.

In this embodiment, when the height of the draft tube 12 is less than 0.5m, the draft tube 12 cannot play a role of guiding the self-compacting concrete, and the draft tube 12 can perform secondary mixing on the self-compacting concrete flowing into the draft tube 12 through the grouting funnel 13, which is beneficial to improving the smoothness of the flow of the self-compacting concrete; when the height of the draft tube 12 is larger than 1m, the draft tube 12 is easily blocked, and the pouring of the self-compacting concrete is interrupted, so that the value range of the height of the draft tube 12 is 0.5 m-1 m.

As shown in fig. 2, 3, and 4, in this embodiment, the left side installation sideline offset distance L1 and the right side installation sideline offset distance L2 are both positive integers, and the value range of the left side installation sideline offset distance L1 and the value range of the right side installation sideline offset distance L2 are both 90mm to 150 mm.

During the time of the actual use, when setting for the value of left side installation sideline offset distance L1 with right side installation sideline offset distance L2, the main factor of considering has two: the first consideration is: in order to realize the measurement lofting of the left side installation sideline offset distance L1 and the right side installation sideline offset distance L2 on the track base 5, the distance between the left side surface of the turnout plate 3 and the left side line of the track base 5 and the distance between the right side surface of the turnout plate 3 and the right side line of the track base 5, therefore, the left side installation sideline offset distance L1 should be smaller than the distance between the left side surface of the turnout plate 3 and the left side line of the track base 5, and the right side installation sideline offset distance L2 should be smaller than the distance between the right side surface of the turnout plate 3 and the right side line of the track base 5; the second consideration is: the convenience of the operator for measuring by adopting a triangular steel plate ruler and the convenience for operating the three-way regulator 11; therefore, the value range of the left side installation sideline offset distance L1 and the value range of the right side installation sideline offset distance L2 are both 90 mm-150 mm;

in this embodiment, the interval between the left surface of switch board 3 and the left side line of track basis 5 and the interval between the right flank of switch board 3 and the right sideline of track basis 5 are 200mm, and the measuring range of the right-angle side of triangle steel plate ruler is 130mm, consequently, work as left side installation sideline offset distance L1 with right side installation sideline offset distance L2 all is less than when 90mm, or work as left side installation sideline offset distance L1 with right side installation sideline offset distance L2 all is greater than when 150mm, all be inconvenient for operating personnel adopt triangle steel plate ruler to measure and adopt three-way regulator 11 to adjust the elevation position and the plane position of switch board 3.

In this embodiment, the value range of the left side installation sideline offset distance L1 and the right side installation sideline offset distance L2 are both 100mm, so that an operator can conveniently measure by using a triangular steel plate ruler and adjust the plane position of the turnout plate 3 by using the three-way adjuster 11.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.