阅读说明：本技术 地铁车站轨顶风道的支撑架体施工方法 (Construction method of support frame body of subway station rail top air duct ) 是由 黄日生 叶社保 吴永哲 张志宇 刘小海 孙鹏飞 彭志刚 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种地铁车站轨顶风道的支撑架体施工方法,方法中,铺设底板以及位于底板上的台车轨道；安装台车,台车包括支撑桁架系统、行走移动系统和安全防护系统,支撑桁架系统经由横梁和立柱构成门式架体,行走移动系统连接于门式架体的底部；吊装台车于台车轨道,使得行车轮支承于台车轨道上；台车上搭设支架,在支架上铺设模板,在模板上进行轨顶风道的钢筋安装和混凝土浇筑后,拆除模板,台车沿台车轨道移动到下一施工段后铺设模板,继续轨顶风道的钢筋安装和混凝土浇筑,循环直到轨道风道施工完成。地铁车站轨顶风道的支撑架体施工方法能够实现轨顶风道与盾构区间隧道同步施工。(The invention discloses a support frame construction method of a rail top air duct of a subway station, wherein in the method, a bottom plate and a trolley rail positioned on the bottom plate are paved; installing a trolley, wherein the trolley comprises a support truss system, a walking moving system and a safety protection system, the support truss system forms a door type frame body through a cross beam and an upright post, and the walking moving system is connected to the bottom of the door type frame body; hoisting the trolley on the trolley track to enable the travelling wheels to be supported on the trolley track; and (3) erecting a support on the trolley, laying a template on the support, removing the template after the reinforcing steel bar installation and concrete pouring of the rail top air channel are carried out on the template, laying the template after the trolley moves to the next construction section along the trolley track, continuing the reinforcing steel bar installation and concrete pouring of the rail top air channel, and circulating until the construction of the track air channel is completed. The construction method of the support frame body of the rail top air duct of the subway station can realize synchronous construction of the rail top air duct and the shield interval tunnel.)

1. A construction method of a support frame body of a rail top air duct of a subway station is characterized by comprising the following steps,

firstly, laying a bottom plate and a trolley track on the bottom plate;

the second step is that: the trolley is installed and comprises a supporting truss system, a walking moving system and a safety protection system, wherein the supporting truss system forms a portal frame body through a cross beam and an upright post, the walking moving system is connected to the bottom of the portal frame body and comprises travelling wheels and a support arranged at the bottom of the portal frame body, the safety protection system is connected to the top of the portal frame body and comprises a protection railing;

the third step: hoisting the trolley on the trolley track to enable the travelling wheels to be supported on the trolley track;

the fourth step: erecting supports on a trolley, wherein a plurality of I-shaped steel or channel steel is laid on the trolley at intervals in the longitudinal direction to form a main ridge, a panel is laid on the main ridge, and the supports are erected layer by layer according to the sequence of vertical rods, transverse rods and inclined rods;

the fifth step: and laying a template on the support, removing the template after the reinforcing steel bars of the rail top air channel are installed and concreted on the template, laying the template after the trolley moves to the next construction section along the trolley track, continuing the reinforcing steel bar installation and concreting of the rail top air channel, and circulating until the construction of the rail air channel is finished.

2. The construction method of the support frame body of the rail top air duct of the subway station as claimed in claim 1, wherein in the second step, said cross beam comprises double-spliced I-shaped steel, said upright comprises double-spliced channel steel, said portal frame body further comprises a connecting beam between the upright, and said cross beam on the upper part and the top of the upright is provided with inclined struts.

3. The construction method of the support frame body of the rail top air duct of the subway station as claimed in claim 1, wherein in the second step, said portal frame body is a hollow structure for allowing a shield electric power cart to pass through.

4. The construction method of the support frame body of the rail top air duct of the subway station as claimed in claim 1, wherein in the fourth step, said support is a fastener steel pipe support which is detachably connected with the bogie.

5. The method of claim 1, wherein the support comprises a jack.

6. The method as claimed in claim 1, wherein the support frame of the rail head duct of the subway station has a longitudinal straightness less than two hundredths of the total length and a horizontal straightness between the cross bars less than four hundredths of the total length.

7. The method as claimed in claim 1, wherein the support frame of the rail head duct of the subway station has a longitudinal straightness less than two hundredths of the total length and a horizontal straightness between the cross bars less than four hundredths of the total length.

8. The construction method of the support frame body of the rail top air duct of the subway station as claimed in claim 1, wherein a transverse interval and a longitudinal interval of said support frame are not more than 0.9 m.

9. The method of claim 1, wherein the trolley rail is made of channel steel.

10. The construction method of the support frame body of the rail top air duct of the subway station as claimed in claim 1, wherein the height of the guard rail is 1.2 m, and the distance between the columns of the guard rail is 0.6 m.

Technical Field

The invention relates to the technical field of subway station rail top air duct installation, in particular to a support frame body construction method of a subway station rail top air duct.

Background

The rail top air duct is an important internal structural component in a ventilation system of a subway station, is suspended at the junction position of a middle plate and a structural side wall of the station, is limited by the structural space and the particularity of the position where the structural space is located, and is not generally poured with a main body of the station at the same time. The train marshalling of shield construction is operated on the station bottom plate and just below the designed position of the rail top air duct, and the inevitable mutual influence exists with the construction of the rail top air duct. According to the traditional technical scheme, a full scaffold is erected as a construction supporting system after the construction of the station shield interval tunnel is completed, the construction period generally needs 3 months, and the whole construction period is too long. Along with the increase of the demand degree of each city on the subway, each region construction unit has shorter and shorter requirements on the subway construction period, so that the feasibility research on the synchronous construction of the rail top air duct and the shield interval tunnel can well make up the current situation, and the method has important reference significance and good popularization prospect on the construction of the rail top air duct of the subway station in the future.

The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a support frame body construction method of a rail top air duct of a subway station, which realizes synchronous construction of the rail top air duct and a shield interval tunnel, and provides the following technical scheme for realizing the aim:

the invention discloses a construction method of a support frame body of a rail top air duct of a subway station, which comprises the following steps:

firstly, laying a bottom plate and a trolley track on the bottom plate;

the second step is that: the trolley is installed and comprises a supporting truss system, a walking moving system and a safety protection system, wherein the supporting truss system forms a portal frame body through a cross beam and an upright post, the walking moving system is connected to the bottom of the portal frame body and comprises travelling wheels and a support arranged at the bottom of the portal frame body, the safety protection system is connected to the top of the portal frame body and comprises a protection railing;

the third step: hoisting the trolley on the trolley track to enable the travelling wheels to be supported on the trolley track;

the fourth step: erecting supports on a trolley, wherein a plurality of I-shaped steel or channel steel is laid on the trolley at intervals in the longitudinal direction to form a main ridge, a panel is laid on the main ridge, and the supports are erected layer by layer according to the sequence of vertical rods, transverse rods and inclined rods;

the fifth step: and laying a template on the support, removing the template after the reinforcing steel bars of the rail top air channel are installed and concreted on the template, laying the template after the trolley moves to the next construction section along the trolley track, continuing the reinforcing steel bar installation and concreting of the rail top air channel, and circulating until the construction of the rail air channel is finished.

In the construction method of the support frame body of the rail top air channel of the subway station, in the second step, the cross beam comprises double-spliced I-shaped steel, the stand column comprises double-spliced channel steel, the door type frame body further comprises a connecting beam arranged between the stand columns, and the cross beams on the upper portions of the stand columns and at the top portions of the stand columns are provided with inclined struts.

In the construction method of the support frame body of the rail top air duct of the subway station, in the second step, the door type frame body is of a hollow structure capable of passing through the shield storage battery car.

In the construction method of the support frame body of the rail top air duct of the subway station, in the fourth step, the support is a fastener steel pipe support which is detachably connected with the trolley.

In the construction method of the support frame body of the rail top air duct of the subway station, the support comprises a jack.

In the construction method of the support frame body of the rail top air duct of the subway station, the longitudinal straightness of a bottom layer horizontal frame of the support is less than two percent of the total length, and the levelness among the cross rods is less than four percent of the total length.

In the construction method of the support frame body of the rail top air duct of the subway station, the longitudinal straightness of a bottom layer horizontal frame of the support is less than two percent of the total length, and the levelness among the cross rods is less than four percent of the total length.

In the construction method of the support frame body of the rail top air duct of the subway station, the transverse distance and the longitudinal distance of the support are not more than 0.9 m.

In the construction method of the support frame body of the rail top air duct of the subway station, the trolley rail is made of channel steel.

In the construction method of the support frame body of the rail top air duct of the subway station, the height of the protective railing is 1.2 meters, and the distance between the upright posts of the protective railing is 0.6 m.

In the technical scheme, the construction method and the assembly method of the support frame body of the rail top air duct of the subway station have the following beneficial effects: compared with the prior art, the construction method of the support frame body of the air duct at the top of the subway station rail has the advantages of high overall rigidity and high stability. The trolley adopts double-spliced I-shaped steel as a structural main beam, double-spliced channel steel is a stand column, double-spliced channel steel connecting beams are added around the frame body, inclined struts are assisted at corners, all components are fully welded and firmly connected, the overall structural rigidity of the trolley is high, mid-span deflection can be effectively controlled, and the construction quality of the rail top air channel structure is effectively guaranteed. Construction is convenient, the trolley is fully paved with the walkway plates as an operation platform, then the fastener steel pipe support is erected on the trolley and used for directly supporting the system of the rail top air duct structure, the screw rod of the fastener support is integrally adjusted downwards after the construction of the section of structure is completed so that the template is separated from the structure, and then the trolley and the fastener support on the trolley are integrally moved to the next construction section. Avoiding the support from being assembled and disassembled. The cross operation is not interfered mutually. The trolley adopts a portal frame mode, so that the shield storage battery car can freely pass through the lower part of the trolley, the upper part of the trolley is a rail top air channel operation platform, two projects are isolated in space, and synchronous construction of the shield and the rail top air channel becomes possible. .

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic flow chart of a construction method of a support frame of a rail top duct of a subway station according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

In one embodiment, the construction method of the support frame body of the rail top air duct of the subway station comprises the following steps,

firstly, laying a bottom plate and a trolley track on the bottom plate;

the second step is that: the trolley is installed and comprises a supporting truss system, a walking moving system and a safety protection system, wherein the supporting truss system forms a portal frame body through a cross beam and an upright post, the walking moving system is connected to the bottom of the portal frame body and comprises travelling wheels and a support arranged at the bottom of the portal frame body, the safety protection system is connected to the top of the portal frame body and comprises a protection railing;

the third step: hoisting the trolley on the trolley track to enable the travelling wheels to be supported on the trolley track;

the fourth step: erecting supports on a trolley, wherein a plurality of I-shaped steel or channel steel is laid on the trolley at intervals in the longitudinal direction to form a main ridge, a panel is laid on the main ridge, and the supports are erected layer by layer according to the sequence of vertical rods, transverse rods and inclined rods;

the fifth step: and laying a template on the support, installing and pouring concrete on the template, then removing the template, laying the template after the trolley moves to the next construction section along the trolley track, continuing the installation of the steel bars and the pouring of the concrete in the rail top air channel, and circulating until the construction of the rail air channel is finished.

In the preferable embodiment of the construction method of the support frame body of the rail top air channel of the subway station, in the second step, the cross beam comprises double-spliced I-shaped steel, the stand column comprises double-spliced channel steel, the door type frame body further comprises a connecting beam arranged between the stand columns, and the cross beams on the upper portions of the stand columns and at the top portions of the stand columns are provided with inclined struts.

In the preferable embodiment of the construction method of the support frame body of the rail top air duct of the subway station, in the second step, the portal frame body is a hollow structure which can pass through the shield storage battery car.

In the preferred embodiment of the construction method of the support frame body of the rail top air duct of the subway station, in the fourth step, the support is a fastener steel pipe support which is detachably connected with the trolley.

In a preferred embodiment of the construction method of the support frame body of the rail top air duct of the subway station, the support comprises a jack.

In the preferable embodiment of the construction method of the support frame body of the rail top air duct of the subway station, the longitudinal straightness of the bottom layer horizontal frame of the support is less than two percent of the total length, and the levelness among the cross rods is less than four percent of the total length.

In the preferable embodiment of the construction method of the support frame body of the rail top air duct of the subway station, the longitudinal straightness of the bottom layer horizontal frame of the support is less than two percent of the total length, and the levelness among the cross rods is less than four percent of the total length.

In the preferable embodiment of the construction method of the support frame body of the rail top air duct of the subway station, the transverse distance and the longitudinal distance of the support frame are not more than 0.9 m.

In a preferred embodiment of the construction method of the support frame body of the rail top air duct of the subway station, the trolley rail is made of channel steel.

In the preferable embodiment of the construction method of the support frame body of the rail top air duct of the subway station, the height of the protective railing is 1.2 m, and the distance between the upright posts of the protective railing is 0.6 m.

In one embodiment, the steel structure trolley comprises a support truss system, a walking movement system and a safety protection system.

The support truss system is formed by welding a cross beam and an upright post which are made of section steel, double-spliced I-shaped steel is used as a bottom longitudinal main beam and a top transverse main beam, double-spliced channel steel is used as an upright post, and the cross beam and the upright post form a portal frame body in a full welding mode; in order to ensure the integral stability of the frame body, through-long channel steel is welded at certain intervals longitudinally to serve as a connecting beam so as to reduce the slenderness ratio of the upright column; the upper parts of the stand columns and the top cross beam are additionally provided with the inclined struts, the cantilever ends of the top cross beam and the maximum bending moment of the midspan are changed, the beam flexibility is reduced, and further the structural deformation of the cast-in-place rail top air duct is controlled.

The traveling moving system comprises traveling wheels, rails and supports, the traveling wheels are installed below a longitudinal main beam, phi 300mm steel casting wheels are adopted, 4 traveling wheels are configured on each section of device and serve as trolley moving devices, and after structural construction is completed, the trolley and the upper frame body integrally move to the next construction section. The track adopts 80# channel steel, and the back-off is on the structure bottom plate to expansion bolts is fixed. The support adopts the jack, fills up in walking roof beam below at the track top wind channel construction stage to reduce the device wheel pressure, and play the fixed action, prevent the device displacement.

The safety protection system is characterized in that a protection railing fence protection system is arranged around the top of the trolley, so that the safety of operators is guaranteed. The protection railing adopts the preparation of 3cm angle steel, and 1.2 meters high, vertically faces the sky side along the platform truck and arranges, and railing stand interval 60cm arranges together, vertically sets up 3 railings, forms all around confined face limit protection system, guarantees construction safety.

The steel structure trolley is a movable portal truss, spans two shield transport trains, provides a construction platform above the steel structure trolley, carries out the construction of the rail top air channel, can be hoisted and placed to the bottom plate after being welded on the ground, and then runs to the construction area through the traveling and moving system. Longitudinal channel steel is uniformly laid on the trolley to serve as a main beam of the upper frame body, and the self weight of the rail top air channel structure is transferred to the steel structure trolley; a fastener type steel pipe support system is erected on the channel steel main beam and used as a direct bearing support of the rail top air channel.

Referring to fig. 1, in one embodiment, before the trolley is manufactured and the formwork support frame is erected, an engineering technical responsible person should carry out technical safety delivery to manufacturing, erecting and using personnel according to the requirements of a construction scheme.

The trolley tracks are laid on the bottom plate, the trolley tracks are made of 80# channel steel and are reversely buckled on the structural bottom plate, the trolley tracks are fixed through expansion bolts, the trolley tracks are laid along the lower edge of the axillary angle of the bottom plate close to the side wall, and the outer sides of the trolley tracks are calculated according to the width of the trolley.

And (4) checking and accepting steel products, steel pipes, fasteners and the like, and strictly forbidding using unqualified products.

In one embodiment, the trolley is manufactured on the ground in advance, blanking is performed accurately according to the structural drawing of the trolley, the double-spliced component is welded firmly, and stiffening rib plates are additionally arranged inside the component. All structural components of the trolley are welded by adopting an E55 type welding rod, the periphery of the trolley is fully welded, the welding quality of all connecting points needs to be carefully checked after the trolley is manufactured, and welding missing cannot occur. For the convenience of construction and hoisting, the protective handrail on the trolley is not welded on the ground, and the welding is completed in the station after the trolley goes into the well.

After the trolley is machined and manufactured, firstly, a 25t truck crane is adopted to hoist the trolley to a range of hoisting of a gantry crane, and then the gantry crane is hoisted to the bottom plate from the end well. The total weight of the single-section trolley is about 7.8t, 4 steel wire ropes with the diameter of 24mm, the length of 9m and the tensile strength of 1770N/mm2 are hoisted at 4 points to ensure hoisting safety, and 12t of shackles are adopted for shackle hoisting. The lifting points are arranged at the peripheral corners of the top beam. Guardrail bar is prevented in the inside welding of station after platform truck hoists to take one's place, and the railing adopts the preparation of 3cm angle steel, and 1.2 meters high is vertically faced the empty side along the platform truck and is arranged, and railing stand interval 60cm is arranged together, vertically sets up 3 railings.

In one embodiment, 12# I-steel or 12# channel steel is laid on a trolley surface layer longitudinally after the trolley is hoisted in place, the distance is 900mm, the local distance is 600mm, the distance between the main ridges is adjusted according to the distance between the trolley upper support vertical rods and is consistent with the transverse distance between the trolley upper support vertical rods, and the I-steel or the channel steel is spot-welded with the trolley structure and the trolley upper support.

In one embodiment, after the trolley panel is laid, the fastener type steel pipe support is lifted on the panel, and the support is erected layer by layer according to the sequence of the vertical rod, the transverse rod and the inclined rod. The longitudinal straightness of the bottom horizontal frame is less than or equal to L/200; the levelness between the cross bars is less than or equal to L/400. The vertical and horizontal rods and the vertical rods are connected and fastened through fasteners at each step. The verticality of the whole height of the bracket is less than L/500; the maximum allowable deviation should be less than 100 mm.

In one embodiment, the rail top air ducts of the standard section of the station all use trolleys as a bottom layer supporting system, fastener type steel pipe scaffolds are adopted on the panels of the trolleys, wood templates with the thickness of 15mm are adopted on the panels, an A-type phi 48 x 3.2 steel pipe support is adopted as a fastener type support, the vertical distance between upright rods of the upper supports of the two types of typical sections is 1200mm, the transverse distance is 900mm, and an upright rod is transversely arranged below an inner partition wall or a side wall of the rail top air duct so as to ensure that the bearing capacity of the upright rods below the side wall meets the requirement. Because the clear height of the upper part of the trolley from the bottom plate of the rail top air duct is only 945mm, the bracket is only provided with two horizontal rod pieces, the distance between the bottom horizontal rod piece and the trolley panel is 150mm, and the distance between the top horizontal rod piece and the bottom horizontal rod piece is 400 mm. The specific support parameter design is shown in table 1 below:

table 1 table support parameter design table

Because the whole body of the frame body is low, the frame body is not provided with the diagonal rods longitudinally, and the frame body is transversely provided with one diagonal rod every 3 spans.

In one embodiment, the width of the first station rail top air duct between 24-25 shafts, the width of the second station rail top air duct between 4-5 shafts, and the width of the third station rail top air duct between 3-4 shafts and 22-23 shafts exceed the width of a trolley, a trolley matched floor fastener type steel pipe scaffold is adopted in the area to serve as a rail top air duct formwork supporting system, an upper bracket of the trolley is consistent with a typical cross section arrangement mode, a wood formwork with the thickness of 15mm is adopted in an area formwork outside the trolley, a floor fastener type steel pipe bracket is adopted by a phi 48 multiplied by 3.2 steel pipe bracket, the longitudinal distance between vertical rods of the bracket is 1200mm, the transverse distance is 900mm, and a vertical rod is transversely additionally arranged below the side wall of the rail top air duct to ensure that the bearing capacity of the vertical rod under the side wall meets the requirement. The standard step pitch is 1200mm, and top layer and bottom horizontal pole are for cooperating the horizontal pole height adjustment on the platform truck to be 900mm, and the pole of sweeping the floor is 135mm from the bottom plate face, and the outside from the top down sets up vertical bridging around the console mode support body, sets up horizontal bridging on bottom and the top layer horizontal pole, and the inside every 3 strides of support body sets up one horizontal bridging.

The steel structure is used as a rail top air duct support frame body, and has reference and guidance significance for the rail top air duct structure construction of the same type of station, particularly a shield bidirectional originating station in future. By means of the Madass structural software analysis and construction monitoring technology, construction is always in a safe and controllable range, safety risks are reduced, and expected effects are achieved by field implementation. The steel structure trolley is adopted as a construction method of the rail top air duct support frame, the synchronous construction purpose of the interval shield and the rail top air duct structure is successfully realized, and a complete construction technology of the rail top air duct structure is provided. Construction period is about 1.5 months, influences the implementation of electromechanical shop rail, and the combined use of steel structure platform truck and template system provides the solution thinking for the shield well shutoff, adopts steel structure platform truck back shop rail and shield to construct in step, and the shop rail implementation can advance 1.5 months and enter the field, has improved the rate of utilization of steel structure platform truck simultaneously.

Finally, it should be noted that: the embodiments described are only a part of the embodiments of the present application, and not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments in the present application belong to the protection scope of the present application.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.