Method for constructing interface between subway station and auxiliary main body structure

Abstract

The application discloses a subway station and subsidiary main body structure interface construction method, which comprises the following steps: excavating earthwork between the main body structure bored pile and the subsidiary structure bored pile; constructing a corbel connected with the main body structure bored pile in the construction space; constructing a subsidiary structure bottom plate, wherein the subsidiary structure bottom plate is connected with the corbel, and a post-poured strip located above the corbel is reserved on the subsidiary structure bottom plate; removing part of the supporting beam and part of the main body structure bored pile above the corbel, and setting a lattice column in the vacancy of the main body structure bored pile to support the suspended main body structure crown beam; integrally pouring concrete for the post-poured strip and the corresponding part of the lattice column; and cutting off the lattice column outside the concrete after the post-poured strip concrete reaches the predetermined strength. The application has the effect of reducing the construction process of the temporary connection between the station main body structure and the subsidiary structure, and effectively shortening the construction period.

Description

Technical Field

[0001] This invention relates to the field of subway station construction technology, and in particular, to a construction method for the interface between a subway station and its ancillary main structure. Background Technology

[0002] The reasons for the long construction period of underground stations in urban rail transit include the large size of the stations, the impact of tunnel boring on ancillary construction, and the long cycle of traffic diversion and side-laying. The ancillary construction with a long construction period is the ventilation shaft construction, mainly because the impact of the removal of retaining piles on the cap beam can only be eliminated after the completion of the main structure roof slab construction.

[0003] The basic conditions for trial operation of urban rail transit include ventilation shafts and two or more entrances / exits. However, the construction of ventilation shafts requires the removal of many main station retaining piles. Before removing these retaining piles, a second layer of steel supports must be dismantled. The condition for dismantling the second layer of steel supports is that the base slab construction is completed and reaches the required strength. The temporary connection between the base slab and the main structure's bored piles becomes a challenge. Traditional construction methods involve reserving a post-cast strip in the base slab, using I-beams to temporarily support the bored piles of the main structure at the post-cast strip, and then dismantling the bored piles and temporary supports in sections to construct the base slab. Each section consists of 2 to 4 bored piles, resulting in numerous construction steps and a long construction period. Summary of the Invention

[0004] This invention provides a construction method for the interface between a subway station and its auxiliary main structure, in order to solve the technical problem of multiple construction procedures and long construction cycles in the existing temporary connection between the ventilation shaft base plate and the main structure of the subway station.

[0005] According to one aspect of the present invention, a construction method for the interface between a subway station and its ancillary main structure is provided, comprising the following steps: constructing bored piles for the main structure and bored piles for the ancillary structure, and constructing a support beam between the bored piles of the main structure and the bored piles of the ancillary structure; excavating earth between the bored piles of the main structure and the bored piles of the ancillary structure to form a construction space; constructing a corbel connected to the bored piles of the main structure within the construction space; constructing the base plate of the ancillary structure, the base plate of the ancillary structure being connected to the corbel, and a post-cast strip reserved on the base plate of the ancillary structure above the corbel; removing part of the support beam and part of the bored piles of the main structure above the corbel, and setting a lattice column in the gap of the bored piles of the main structure to support the suspended main structure cap beam; integrally pouring concrete with the post-cast strip and the corresponding part of the lattice column; and cutting off the lattice column located outside the concrete after the concrete of the post-cast strip reaches a predetermined strength.

[0006] By adopting the above technical solution, the support beam can support the main structure bored piles and auxiliary structure bored piles, avoiding deformation of the main structure bored piles and auxiliary structure bored piles after earthwork excavation. The corbel can support the base plate of the auxiliary structure. By replacing some of the main structure piles with lattice columns and casting the lattice columns and the post-cast strip of the auxiliary structure base plate as a whole, a stable connection is formed between the auxiliary structure base plate and the main structure bored piles. Since the lattice columns can support the suspended main structure cap beam, more main structure bored piles and support beams can be removed at one time during construction, and construction can be completed in one construction section. In contrast, traditional construction methods require multiple constructions because the main structure bored piles are not supported after removal, and only 2-4 piles can be removed in each section. Therefore, this solution can reduce the construction procedures for temporary connections between the station's main structure and auxiliary structure, effectively shortening the construction cycle.

[0007] Optionally, in the step of dismantling part of the main structure bored piles above the support beam and corbel, and replacing the dismantled main structure bored piles with lattice columns, the lattice columns are spaced apart, and the main structure bored piles between adjacent lattice columns remain suspended.

[0008] By adopting the above technical solution, and based on calculations and actual construction experience, after removing the main structure bored piles, it is not necessary to set up lattice columns at each removal location. A lattice column is installed every other main structure bored pile, which can ensure the stability of connection and support, reduce the amount of construction work, and further shorten the construction period.

[0009] Optionally, in the step of dismantling part of the supporting beam and the main structure bored piles above the corbel, and setting lattice columns in the gap of the main structure bored piles to support the suspended main structure crown beam, 400mm-600mm of the main structure bored pile main reinforcement is retained in the dismantled section, and the lattice column is fixedly connected to the retained main structure bored pile main reinforcement.

[0010] By adopting the above technical solution, the connection between the main reinforcement of the lattice column and the main structure bored pile can improve the stability of the connection between the lattice column and the main structure bored pile, enabling the lattice column to withstand greater loads.

[0011] Optionally, the lattice column includes an upper column and a lower column. The step of setting the lattice column in the gap of the main structure bored pile to support the suspended main structure cap beam includes the following steps: fixing the top of the upper column to the main reinforcement of the upper main structure bored pile; fixing the bottom of the lower column to the main reinforcement of the lower column structure pile; and fixing the bottom of the upper column to the top of the lower column.

[0012] By adopting the above technical solution, if a whole lattice column is directly installed in the gap of the main structure bored pile, the main reinforcement of the main structure bored pile will interfere with the installation of the lattice column during the dismantling process. By dividing the lattice column into upper and lower sections for installation, the upper and lower columns can be inserted between the main reinforcements respectively during installation, which can reduce the impact of the main reinforcement of the main structure bored pile on the installation process and make the lattice column easier to install.

[0013] Optionally, a first connecting plate is provided at the top of the upper column and the bottom of the lower column. A connecting rib is provided on the first connecting plate. One end of the connecting rib is parallel to the first connecting plate and fixedly connected to the first connecting plate, and the other end of the connecting rib is parallel to the main rib and fixedly connected to the main rib.

[0014] By adopting the above technical solution, the connecting bar can connect the main reinforcement of the lattice column and the main structure bored pile together; and one end of the connecting bar is parallel to the first connecting plate, and the other end of the connecting bar is parallel to the main reinforcement, which can increase the connection area between the connecting bar and the first connecting plate and between the connecting bar and the main reinforcement, respectively, making the connection more stable.

[0015] Optionally, a second connecting plate is provided at the bottom end of the upper column and the top end of the lower column. The fixed connection between the bottom end of the upper column and the top end of the lower column includes the following steps: attaching the second connecting plate of the upper column and the second connecting plate of the lower column together; and fixing the second connecting plate of the upper column and the second connecting plate of the lower column by means of bolt connection or welding.

[0016] By adopting the above technical solution, the upper column and the lower column are connected by a second connecting plate. The two second connecting cover plates fit together to stably transmit the load, so that the upper column and the lower column will not slip or misalign when bearing a large load, and the structure is more stable.

[0017] Optionally, before the step of integrally pouring concrete with the post-pouring strip and the corresponding part of the lattice column, the following steps are also included: welding a water-stop steel plate on the lattice column, the water-stop steel plate surrounding the lattice column along the direction perpendicular to the length of the lattice column; during the process of integrally pouring concrete with the post-pouring strip and the corresponding part of the lattice column, the concrete covers the water-stop steel plate.

[0018] By adopting the above technical solution, the waterstop steel plate can improve the waterproof performance of the connection between the main structure and the auxiliary structure of the station. The waterstop steel plate can be directly welded and fixed to the lattice column, so that the waterstop steel plate can remain stable during the concrete pouring process without the need for additional fixing.

[0019] Optionally, the post-cast strip is provided with a reinforcing bar, and the main structure of the station is provided with a steel bar connector. Before the step of pouring concrete integrally with the post-cast strip and the corresponding lattice column, the following step is also included: passing the reinforcing bar through the lattice column and connecting it with the steel bar connector.

[0020] By adopting the above technical solution, the steel bars of the auxiliary structure base plate and the steel bars of the main structure are directly connected through steel bar splices, which can further improve the stability of the connection between the auxiliary structure base plate and the main structure.

[0021] Optionally, after connecting the reinforcing bars through the lattice column and the rebar connector, the following steps are also included: planting rebars on the main structure of the station, with the planted rebars extending through the lattice steel to the post-cast strip of the auxiliary structure base slab.

[0022] By adopting the above technical solution, when the angle steel on the lattice column is obstructed or the number of steel bar connectors reserved on the main structure is insufficient, the steel bar can be effectively densified by rebar installation, thereby improving the connection strength between the auxiliary structure base plate and the main structure.

[0023] Optionally, after the lattice column located outside the concrete is removed after the post-cast strip concrete reaches the predetermined strength, the following steps are also included: constructing the top slab of the auxiliary structure, the top slab of the auxiliary structure is located above the bottom slab of the auxiliary structure, and the top slab of the auxiliary structure is connected to the main structure bored piles and the auxiliary structure bored piles respectively; constructing the auxiliary structure waterproof layer on the upper surface of the top slab of the auxiliary structure.

[0024] By adopting the above technical solution, the waterproof layer of the auxiliary structure can be directly applied after the construction of the roof slab, which can prevent water in the soil above the roof slab from seeping into the auxiliary structure and improve its waterproofness.

[0025] Optionally, after constructing the waterproof layer of the auxiliary structure on the upper surface of the auxiliary structure top plate, the following step is further included: constructing a waterproof chamfer on the side of the auxiliary structure waterproof layer close to the main structure bored pile.

[0026] By adopting the above technical solutions, the waterproof performance can be further improved.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Ensure the stability of the connection between the auxiliary structure base plate and the main structure, while accelerating the construction progress of the interface between the auxiliary structure and the main structure, and shortening the construction cycle. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This is a flowchart of the construction method for the interface between the subway station and its ancillary main structure according to the present invention;

[0031] Figure 2This is a cross-sectional schematic diagram of the interface between the subway station and the auxiliary main structure of the present invention;

[0032] Figure 3 This is a longitudinal cross-sectional schematic diagram of the interface between the subway station and the auxiliary main structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the base plate and bracket of the auxiliary structure of the present invention;

[0034] Figure 5 This is a top view of the lattice column of the present invention;

[0035] Figure 6 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0036] Figure 7 This is a diagram showing the arrangement of the lattice columns of the present invention;

[0037] Figure 8 This is a schematic diagram of the waterproof structure of the lattice column of the present invention;

[0038] Figure 9 This is a schematic diagram of the waterproof structure of the top plate of the auxiliary structure of the present invention.

[0039] Legend:

[0040] 1. First connecting plate; 2. Main structure bored pile; 3. Main reinforcement of bored pile; 4. Lattice column; 5. Connecting reinforcement; 6. Second connecting plate; 7. Reinforcement bar; 8. Corbel; 9. Auxiliary structure base plate; 10. Post-cast strip; 11. Reinforcing bar connector; 12. Main structure middle plate; 13. Angle steel; 14. Weld; 15. Waterstop steel plate; 16. Main structure capping beam; 17. Auxiliary structure steel support; 18. Auxiliary structure capping beam; 19. Auxiliary structure concrete support; 20. Auxiliary structure bored pile; 21. Waterproof chamfer; 22. Auxiliary structure waterproof layer; 23. Auxiliary structure top plate. Detailed Implementation

[0041] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0042] The following is in conjunction with the appendix Figure 1 —9 provides further details regarding this application.

[0043] This application discloses a construction method for the interface between a subway station and its ancillary main structure.

[0044] Reference Figure 2 and Figure 3The structure of the interface between the subway station and the auxiliary main structure is shown, including the main structure bored pile 2 and the auxiliary structure bored pile 20. The main structure bored pile 2 is equipped with a corbel 8, and the main structure bored pile 2 is equipped with a main structure cap beam at the top. The auxiliary structure bored pile 20 is equipped with an auxiliary structure cap beam 18 at the top. From bottom to top, the auxiliary structure bottom plate 9, auxiliary structure steel support 17, auxiliary structure top plate 23, and auxiliary structure concrete support 19 are arranged between the main structure bored pile 2 and the auxiliary structure bored pile 20.

[0045] Reference Figure 1 The construction method for the interface between the subway station and its ancillary main structure includes the following steps:

[0046] Step S100: After the main structure bored pile 2 and the auxiliary structure bored pile 20 are completed, a support beam is constructed between the main structure bored pile 2 and the auxiliary structure bored pile 20.

[0047] In step S200, earthwork is excavated between the main structure bored pile 2 and the auxiliary structure bored pile 20 to form a construction space, and a support beam is constructed between the main structure bored pile 2 and the auxiliary structure bored pile 20.

[0048] The supporting beams include concrete supports 19 and steel supports 17. Before excavation of the station's ancillary foundation pit, monitoring points for pile top horizontal displacement, pile top vertical displacement, support pile horizontal displacement, groundwater level, pipeline settlement, and surface settlement were arranged according to design requirements. Horizontal and vertical monitoring points for the capping beam were also added, and initial values ​​were collected. The earthwork for the station's ancillary construction was excavated in layers and sections. After the earthwork reached the bottom, a 30cm margin was left for manual excavation, followed by layout. Finally, manual excavation was carried out to the bottom elevation of the foundation pit.

[0049] In step S300, the corbel 8 and the auxiliary structure base slab are integrally cast within the construction space. The corbel 8 is connected to the main structure bored pile 2, and a post-cast strip 10 is reserved on the auxiliary structure base slab above the corbel. In a specific embodiment, the post-cast strip 10 is 1m long, and the length of the pre-reserved reinforcing bar on the base slab is 800mm.

[0050] Reference Figure 4 In one specific embodiment, the thickness of the corbel 8 is 400mm, and the transverse and longitudinal reinforcement 7 of the corbel 8 are both 20@150mm to ensure the strength of the corbel 8.

[0051] Step S400: Remove part of the supporting beam and the main structure bored pile 2 above the corbel 8, and set up lattice column 4 in the empty part of the main structure bored pile 2 to support the suspended main structure crown beam.

[0052] In one specific implementation, after the base slab concrete reaches 80% strength, according to the segmentation diagram of the auxiliary main structure, the first section of auxiliary structural steel support 17 is removed, and part of the main structure bored piles 2 is cut off. The cut portion extends from above the top surface of the corbel 8 to below the top surface of the auxiliary main structure's top slab, with a maximum length of 6 piles cut at a time. The cutting method uses a combination of wire sawing and manual demolition. The length of the main reinforcement 3 of the main structure bored piles cut off is 500mm. The lattice column 4 is installed immediately after the main structure bored piles 2 are cut off. The connection between the lattice column 4 and the main reinforcement 3 of the main structure bored piles enhances the stability of the connection between the lattice column 4 and the main structure bored piles 2, enabling the lattice column 4 to withstand greater loads.

[0053] Refer to Figure 5 and Figure 6 The lattice column 4 includes an upper column and a lower column. The upper and lower columns are identical in shape and symmetrically arranged. The top of the upper column and the bottom of the lower column are both provided with a first connecting plate 1, and the bottom of the upper column and the top of the lower column are both provided with a second connecting plate 6. When installing the lattice column 4, the top of the upper column is fixedly connected to the main reinforcement 3 of the bored pile of the upper main structure, the bottom of the lower column is fixedly connected to the main reinforcement of the pile of the lower column structure, and then the bottom of the upper column is fixedly connected to the top of the lower column.

[0054] A connecting bar 5 is provided on the first connecting plate 1. One end of the connecting bar 5 is parallel to the first connecting plate 1, and the other end of the connecting bar 5 is parallel to the main reinforcement. When installing the upper and lower columns, the connecting bar 5 is welded and fixed to the first connecting plate 1 and to the main reinforcement. The connecting bar 5 can connect the main reinforcement of the lattice column 4 and the main structure bored pile 2 together. Moreover, the fact that one end of the connecting bar 5 is parallel to the first connecting plate 1 and the other end of the connecting bar 5 is parallel to the main reinforcement can increase the connection area between the connecting bar 5 and the first connecting plate 1 and between the connecting bar 5 and the main reinforcement, respectively, making the connection more stable.

[0055] The steps for fixing the bottom of the upper column to the top of the lower column are as follows: attaching the second connecting plate 6 of the upper column and the second connecting plate 6 of the lower column together; and fixing the second connecting plate 6 of the upper column and the second connecting plate 6 of the lower column by means of bolt connection or welding.

[0056] Reference Figure 7 In one specific implementation, both the upper and lower columns are 800mm high. The first connecting plate 1 is a 1cm thick steel plate with a diameter of 1m, and the second connecting plate 6 is a 2cm thick steel plate. The upper and lower columns of the lattice column 4 can be prefabricated. In the step of replacing the demolished main structure bored piles 2 with the lattice columns 4, the lattice columns 4 are spaced apart, and the main structure bored piles 2 between adjacent lattice columns 4 remain suspended. During construction, monitoring data is collected at each stage, information-based construction is implemented, and a truck crane is used for installation.

[0057] In step S500, the post-cast strip 10 of the base plate and the corresponding lattice column 4 are integrally cast with concrete.

[0058] The main structure has pre-installed rebar connectors 11 on the slab 12. Before the step of integrally pouring concrete with the post-cast strip 10 and the corresponding lattice column 4, the following step is also included: passing the reinforcing bars through the lattice column 4 and connecting them with the rebar connectors 11. The lattice column 4 includes angle steel 13. When the angle steel 13 structure is obstructed or the number of pre-installed rebar connectors 11 on the main structure is insufficient, the rebar can be effectively densified by rebar anchoring, thereby improving the strength of the connection between the auxiliary structure base slab 9 and the main structure.

[0059] Reference Figure 8 Before pouring concrete, a waterstop steel plate 15 is welded to the angle steel 13 of the lattice column 4. The waterstop steel plate 15 surrounds the lattice column 4 along the length perpendicular to it. During the process of pouring concrete integrally with the post-pouring strip 10 and the corresponding part of the lattice column 4, the concrete covers the waterstop steel plate 15. The waterstop steel plate 15 can improve the waterproof performance of the connection between the main structure and the auxiliary structure of the station. The waterstop steel plate 15 is directly welded and fixed to the lattice column 4, so that the waterstop steel plate 15 can remain stable during the concrete pouring process without the need for additional fixing.

[0060] The lattice column 4 between the auxiliary structure base plate 9 and the auxiliary structure top plate 23 is cut with oxy-acetylene. The cut lattice steel can be recycled and reused, which can reduce costs.

[0061] Step S600, refer to Figure 9 After the concrete in the post-cast strip reaches the predetermined strength, the lattice column located outside the concrete is removed.

[0062] In step S700, construct the auxiliary structure top slab 23, which is located above the auxiliary structure bottom slab 9. Construct an auxiliary structure waterproof layer 22 on the upper surface of the top slab 23. After constructing the auxiliary structure waterproof layer 22 on the upper surface of the top slab 23, construct a waterproof chamfer 21 on the side of the auxiliary structure waterproof layer 22 closest to the main structure drilled pile 2. The waterproof chamfer 21 is made of poured concrete, adding an extra layer of waterproofing to further enhance waterproofing performance. After completing the construction of the auxiliary structure top slab 23 and related waterproofing structures, remove the auxiliary structure concrete support 19 and perform backfilling.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for the interface between a subway station and its ancillary main structure, characterized in that, Includes the following steps: After the main structure bored piles (2) and auxiliary structure bored piles (20) are completed, earthwork is excavated between the main structure bored piles (2) and auxiliary structure bored piles (20) to form a construction space, and a support beam is constructed between the main structure bored piles (2) and auxiliary structure bored piles (20). Within the construction space, a corbel (8) connected to the main structure bored pile (2) is constructed, and an auxiliary structure base plate (9) is constructed. The auxiliary structure base plate (9) is connected to the corbel (8), and a post-pouring strip (10) located above the corbel (8) is reserved on the auxiliary structure base plate (9). Remove part of the main structure bored piles (2) above the supporting beams and corbels (8) so that the removed part can be incorporated into the post-cast strip (10), and set lattice columns (4) in the gap of the main structure bored piles (2) to support the suspended main structure crown beam. The post-cast strip (10) of the auxiliary structural base plate (9) is integrally cast with the corresponding lattice column (4) using concrete; After the concrete in the post-cast strip (10) reaches the predetermined strength, the lattice column (4) located outside the concrete is removed.

2. The construction method for the interface between a subway station and its ancillary main structure according to claim 1, characterized in that, In the step of dismantling the main structure bored piles (2) above the supporting beams and corbels (8) and replacing the dismantled main structure bored piles (2) with lattice columns (4) for support, the lattice columns (4) are spaced apart, and the main structure bored piles (2) between adjacent lattice columns (4) remain suspended.

3. The construction method for the interface between a subway station and its ancillary main structure according to claim 1, characterized in that, In the step of removing the main structure bored piles (2) above the supporting beam and corbel (8) and setting up lattice columns (4) in the gap of the main structure bored piles (2) to support the suspended main structure crown beam, the main structure bored pile main reinforcement (3) of the main structure is retained in the demolished section, and the lattice column (4) is fixedly connected to the main structure bored pile main reinforcement (3).

4. The construction method for the interface between the subway station and its ancillary main structure according to claim 3, characterized in that, The lattice column (4) includes an upper column and a lower column. The step of setting the lattice column (4) in the gap of the main structure bored pile (2) to support the suspended cap beam includes the following steps: The top of the upper column is fixedly connected to the main reinforcement (3) of the bored pile of the upper main structure; The bottom end of the lower column is fixedly connected to the main reinforcement (3) of the bored pile of the main structure below; The bottom of the upper column is fixedly connected to the top of the lower column.

5. The construction method for the interface between the subway station and its ancillary main structure according to claim 4, characterized in that, The top of the upper column and the bottom of the lower column are both provided with a first connecting plate (1). A connecting bar (5) is provided on the first connecting plate (1). One end of the connecting bar (5) is parallel to the first connecting plate (1) and is fixedly connected to the first connecting plate (1). The other end of the connecting bar (5) is parallel to the main reinforcement (3) of the bored pile and is fixedly connected to the main reinforcement (3) of the bored pile.

6. The construction method for the interface between the subway station and its ancillary main structure according to claim 4, characterized in that, The bottom end of the upper column and the top end of the lower column are both provided with a second connecting plate (6). The fixed connection between the bottom end of the upper column and the top end of the lower column includes the following steps: The second connecting plate (6) of the upper column and the second connecting plate (6) of the lower column are attached together; The second connecting plate (6) of the upper column and the second connecting plate (6) of the lower column are fixedly connected by bolts or welding.

7. The construction method for the interface between a subway station and its ancillary main structure according to claim 1, characterized in that, Before the step of integrally casting concrete with the post-cast strip (10) and the corresponding partial lattice column (4), the following steps are also included: A waterstop steel plate (15) is welded onto the lattice column (4), and the waterstop steel plate (15) surrounds the lattice column (4) along the length direction perpendicular to the lattice column (4); During the process of pouring concrete together with the post-cast strip (10) and the corresponding lattice column (4), the concrete is covered with a water-stop steel plate (15).

8. The construction method for the interface between a subway station and its ancillary main structure according to claim 7, characterized in that, The post-cast strip (10) is pre-reserved with reinforcing bars, and the main structure of the station is pre-reserved with steel bar connectors (11). Before the step of integrally casting concrete with the post-cast strip (10) and the corresponding lattice column (4), the following steps are also included: The reinforcing bar is passed through the lattice column (4) and connected to the reinforcing bar connector (11).

9. The construction method for the interface between a subway station and its ancillary main structure according to claim 8, characterized in that, After the step of connecting the reinforcing bar through the lattice column (4) to the reinforcing bar connector (11), the following steps are also included: planting reinforcing bars on the main structure of the station, with the planted reinforcing bars extending through the lattice steel to the post-cast strip (10) of the auxiliary structure base plate (9).

10. The construction method for the interface between a subway station and its ancillary main structure according to claim 1, characterized in that, After the concrete of the post-cast strip (10) reaches the predetermined strength, the lattice column (4) located outside the concrete is removed, and the following steps are also included: The construction of the auxiliary structure top plate (23) is located above the auxiliary structure bottom plate (9). The auxiliary structure top plate (23) is connected to the main structure bored pile (2) and the auxiliary structure bored pile (20) respectively. An auxiliary structure waterproof layer (22) is constructed on the upper surface of the auxiliary structure top slab (23).

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