Turnout foundation structure of straddle type single-rail low-mounted line and construction method thereof
阅读说明:本技术 跨座式单轨低置线路的道岔基础结构及其施工方法 (Turnout foundation structure of straddle type single-rail low-mounted line and construction method thereof ) 是由 康承磊 谢淼 张健 焦世杰 盘法侦 李晓娜 杨昆 王海蝶 于 2020-06-30 设计创作,主要内容包括:本发明提供了一种跨座式单轨低置线路的道岔基础结构及其施工方法,道岔基础结构包括用于支撑道岔梁的多个墩台,多个墩台沿道岔梁的长度方向间隔布设;墩台包括承载道岔梁的承载组件以及支撑承载组件的多个钻孔灌注桩,钻孔灌注桩的底端穿过软弱地层后伸入持力层,顶端支撑于承载组件的底端。该道岔基础结构能够用于场地受限地段,且墩台结构设计灵活,可以根据不同位置的地段特性及受力情况,分别对每个墩台进行设计;每个墩台的承载组件与多个钻孔灌注桩构成刚性承力结构,承担道岔梁转动传递的压力、拉力、弯矩和扭矩,钻孔灌注桩穿过软弱地层后伸入持力层,降低道岔梁在转动过程中的变形,确保道岔基础结构的刚度,满足其长期稳定性的要求。(The invention provides a turnout foundation structure of a straddle type monorail low-lying line and a construction method thereof, wherein the turnout foundation structure comprises a plurality of abutments for supporting a turnout beam, and the abutments are arranged at intervals along the length direction of the turnout beam; the pier comprises a bearing assembly for bearing the turnout beam and a plurality of cast-in-situ bored piles for supporting the bearing assembly, wherein the bottom ends of the cast-in-situ bored piles penetrate through the weak stratum and then extend into the bearing layer, and the top ends of the cast-in-situ bored piles are supported at the bottom ends of the bearing assembly. The turnout foundation structure can be used in a section with a limited site, the pier structure is flexible in design, and each pier can be designed according to the characteristics and stress conditions of the section at different positions; the bearing assembly of each abutment and the plurality of cast-in-situ bored piles form a rigid bearing structure to bear the pressure, the tension, the bending moment and the torque transmitted by the rotation of the turnout beam, and the cast-in-situ bored piles penetrate through a weak stratum and then extend into a bearing layer to reduce the deformation of the turnout beam in the rotation process, ensure the rigidity of the turnout foundation structure and meet the requirement of long-term stability.)
1. The utility model provides a straddle type single track puts switch foundation structure of circuit low which characterized in that: the turnout pier comprises a plurality of abutments for supporting a turnout beam, wherein the abutments are arranged at intervals along the length direction of the turnout beam; the pier is including bearing the load-bearing component and the support of switch roof beam a plurality of drilling bored concrete piles of load-bearing component, the bottom of drilling bored concrete pile stretches into the holding power layer after passing weak stratum, the top support in the bottom of load-bearing component.
2. The turnout foundation structure of claim 1, wherein the bearing assembly comprises a bearing platform arranged at the top end of the cast-in-situ bored pile and a boss fixed on the bearing platform, and the top end of the boss bears the turnout beam; the projection area of the boss in the horizontal plane is smaller than that of the bearing platform in the horizontal plane.
3. The switch foundation structure of claim 2, wherein the lower portion of the cap is buried in the ground; and/or the presence of a gas in the gas,
and a connecting bolt is embedded at the top of the boss.
4. The turnout foundation structure of claim 2, wherein the cast-in-situ bored pile is connected with the bearing platform through a steel bar; and/or the bearing platform is connected with the boss through a steel bar.
5. The switch foundation structure of claim 1, further comprising a concrete pad disposed between the bored pile and the bearing assembly.
6. The switch infrastructure of claim 5, wherein a projected area of the concrete pad in a horizontal plane is greater than a projected area of the load bearing assembly in a horizontal plane.
7. A construction method of a turnout foundation structure, which is applied to the turnout foundation structure of any one of claims 1-6, comprises the following steps:
s1, constructing a plurality of cast-in-situ bored piles, wherein the cast-in-situ bored piles are distributed at intervals, and one end, far away from the turnout beam, of each cast-in-situ bored pile penetrates through the weak stratum and extends into the bearing layer;
s2, constructing a bearing assembly at the top ends of the plurality of cast-in-situ bored piles, so that the bearing assembly is fixed on the plurality of cast-in-situ bored piles, and the construction of a single abutment is completed;
and S3, repeating the step S1 to the step S2, and manufacturing a plurality of abutments arranged at intervals.
8. The construction method of the turnout foundation structure according to claim 7, wherein the step S2 specifically comprises:
constructing a concrete cushion layer at the top ends of the cast-in-situ bored piles, and fixing the concrete cushion layer on the cast-in-situ bored piles; and constructing a bearing platform of the bearing assembly on the concrete cushion layer, constructing a boss of the bearing assembly at the top end of the bearing platform, and completing construction of a single pier.
9. The construction method of the turnout foundation structure of claim 7, wherein the step S1 is preceded by the following steps:
and excavating a construction platform, wherein the depth of the construction platform is 1/4-3/4 of the thickness of the bearing platform of the bearing assembly.
10. The construction method of the turnout foundation structure of claim 7, wherein the step S1 further comprises: embedding steel bars at the top of the cast-in-situ bored pile to connect the bearing assembly; and/or
The step S2 further includes: and embedding a connecting bolt at the top of the bearing component.
Technical Field
The invention relates to the technical field of straddle type monorail traffic engineering, in particular to a turnout foundation structure of a straddle type monorail low-level line and a construction method thereof.
Background
The straddle type single rail mainly takes an overhead structure, the track change of the train is realized by a turnout beam and a track supporting beam of a low-positioned line connected with the turnout beam, the turnout beam is integrally connected with the track supporting beam in the same direction after rotating for a certain angle, but the rotation of the turnout beam easily causes the uneven deformation of the lower foundation of the turnout beam, and the normal track change and the riding comfort of the train are influenced when the deformation is serious. The measures taken in the prior art are mostly to place the turnout foundation structure in a section with relatively high and uniform foundation rigidity so as to meet the stability requirement of the turnout foundation structure, but the turnout foundation structure cannot keep long-term stability usually, and meanwhile, a large amount of maintenance and repair cost is also needed.
Disclosure of Invention
The invention provides a turnout foundation structure of a straddle type monorail low-lying line and a construction method thereof, and aims to solve the technical problem that the turnout foundation structure in the prior art is unstable or not lasting in stability.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a turnout foundation structure of a straddle type monorail low-lying line, which comprises a plurality of abutments for supporting a turnout beam, wherein the abutments are distributed at intervals along the length direction of the turnout beam; the pier is including bearing the load-bearing component and the support of switch roof beam a plurality of drilling bored concrete piles of load-bearing component, the bottom of drilling bored concrete pile stretches into the holding power layer after passing weak stratum, the top support in the bottom of load-bearing component.
Furthermore, the bearing assembly comprises a bearing platform arranged at the top end of the cast-in-situ bored pile and a boss fixed on the bearing platform, and the top end of the boss bears the turnout beam; the projection area of the boss in the horizontal plane is smaller than that of the bearing platform in the horizontal plane.
Furthermore, the lower part of the bearing platform is buried in the ground; and/or a connecting bolt is embedded at the top of the boss.
Further, the cast-in-situ bored pile is connected with the bearing platform through a steel bar; and/or the bearing platform is connected with the boss through a steel bar.
Further, switch foundation structure still includes the concrete cushion, the concrete cushion set up in the bored concrete pile with between the bearing component.
Further, the projected area of the concrete cushion layer in the horizontal plane is larger than the projected area of the bearing assembly in the horizontal plane.
According to another aspect of the present invention, there is provided a construction method of a turnout foundation structure, which is applied to the turnout foundation structure, and includes the following steps:
s1, constructing a plurality of cast-in-situ bored piles, wherein the cast-in-situ bored piles are distributed at intervals, and one end, far away from the turnout beam, of each cast-in-situ bored pile penetrates through the weak stratum and extends into the bearing layer;
s2, constructing a bearing assembly at the top ends of the plurality of cast-in-situ bored piles, so that the bearing assembly is fixed on the plurality of cast-in-situ bored piles, and the construction of a single abutment is completed;
and S3, repeating the step S1 to the step S2, and manufacturing a plurality of abutments arranged at intervals.
Further, the step S2 specifically includes: constructing a concrete cushion layer at the top ends of the cast-in-situ bored piles, and fixing the concrete cushion layer on the cast-in-situ bored piles; and constructing a bearing platform of the bearing assembly on the concrete cushion layer, constructing a boss of the bearing assembly at the top end of the bearing platform, and completing construction of a single pier.
Further, the step S1 is preceded by the following steps: and excavating a construction platform, wherein the depth of the construction platform is 1/4-3/4 of the thickness of the bearing platform of the bearing assembly.
Further, the step S1 further includes: embedding steel bars at the top of the cast-in-situ bored pile to connect the bearing assembly; and/or said step S2 further comprises: and embedding a connecting bolt at the top of the bearing component.
The turnout foundation structure of the straddle type monorail low-lying line, provided by the invention, has the advantages that the plurality of abutments are distributed at intervals for commonly bearing turnout beams, the turnout foundation structure can be used in a section with a limited site, the abutments are flexible in structural design, and each abutment can be respectively designed according to the characteristics and stress conditions of the sections at different positions; in addition, each pier comprises a bearing component and a plurality of cast-in-situ bored piles, the bearing component and the cast-in-situ bored piles form a rigid bearing structure to bear pressure, tension, bending moment and torque transmitted by the rotation of the turnout beam, and the cast-in-situ bored piles penetrate through a weak stratum and then extend into a bearing layer, so that the deformation of the turnout beam in the rotation process can be reduced, the rigidity of the turnout foundation structure is ensured, and the requirement of long-term stability of the turnout foundation structure is met.
Drawings
Fig. 1 is a schematic longitudinal section view of a turnout foundation structure of a straddle-type monorail low-lying line provided by the embodiment of the invention;
FIG. 2 is a top view of a turnout foundation structure of a straddle-type monorail low-lying line provided by an embodiment of the invention;
fig. 3 is a flowchart of a construction method of a turnout foundation structure provided by an embodiment of the present invention.
Description of reference numerals:
10. pier abutment; 11. drilling a cast-in-place pile; 12. a bearing platform; 13. a boss; 14. a concrete cushion; 15. a connecting bolt; 20. a weak formation; 30. a support layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. In the description of the present invention, the related orientation or positional relationship is based on the orientation or positional relationship shown in fig. 1, wherein "top" and "bottom" refer to the top-bottom direction of fig. 1. It is to be understood that such directional terms are merely used to facilitate describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must be constructed and operated in a particular orientation and therefore should not be considered as limiting the invention.
Referring to fig. 1 and 2, in a first aspect of the embodiments of the present application, there is provided a turnout foundation structure of a straddle-type monorail low-lying line, including a plurality of
The switch foundation structure of this application embodiment lays a plurality of
The turnout foundation structure is applied to a straddle type single-rail low-position line, the rigidity of the turnout foundation structure can be obviously improved, the long-term stability of the turnout foundation structure is ensured, the turnout foundation structure is applicable to wide section conditions, the conventional design that the turnout foundation structure can be only placed at the position with good foundation rigidity and uniform bearing capacity in the prior art is broken through, and the turnout foundation structure is flexible in design; meanwhile, the maintenance work amount of the turnout foundation structure can be reduced, the structure is simple, the occupied area is small, and the construction controllability is strong.
In some embodiments, the bearing assembly comprises a
The turnout foundation structure has the advantages that pressure, tension, bending moment and torque generated when the turnout beam rotates are directly applied to the
In some embodiments,
In other embodiments, referring to fig. 1 and 2, a connecting
In some embodiments, referring to fig. 1, the switch foundation structure further includes a concrete pad 14, the concrete pad 14 being disposed between the
Further, the projected area of the concrete pad 14 in the horizontal plane is larger than the projected area of the load bearing assembly in the horizontal plane. Specifically, the concrete pad 14 has a thickness of at least 0.1m and extends outwardly a length greater than or equal to 100mm compared to the
In a second aspect of the embodiments of the present application, there is also provided a construction method of a turnout foundation structure, which is applied to the turnout foundation structure described above, with reference to fig. 3, and includes the following steps: s1, constructing a plurality of cast-in-situ
In the embodiment of the application, the
Specifically, the diameter of cast-in-situ
In some embodiments, step S2 specifically includes: constructing a concrete cushion 14 on the top ends of the plurality of cast-in-situ
In some embodiments, step S1 is preceded by the steps of: and excavating the construction platform, wherein the depth of the construction platform is 1/4-3/4 of the thickness of the bearing
The construction method of the turnout foundation structure in the embodiment of the application is as follows:
1. leveling the field of the construction site, excavating the construction platform according to the slope ratio of 1: 1, wherein the excavation depth is about 2/3 of the thickness of the bearing
2. And constructing the cast-in-situ
3. And after the concrete solidification period of the cast-in-situ
4. After the construction platform is tamped and leveled, the concrete pad 14 is cast in place, so that the concrete pad 14 is horizontally arranged, has a thickness of 0.1m and extends 100mm in length compared with the bearing
5. And after the solidification period of the concrete cushion layer 14 is finished, binding the steel bars pre-embedded in the cast-in-situ
6. And after the concrete setting period of the bearing
7. And (5) repeating the steps 1-6, manufacturing a plurality of
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
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