Supporting member, foundation pit support system and construction method of subway station

Abstract

The present application provides a support member, a foundation pit support system, and a construction method for a subway station. The support member is used in the foundation pit support system for constructing a subway station, and includes a chord member and a connecting member. The two chord members are spaced apart from each other, and the two ends of each chord member are respectively connected to the enclosure of the foundation pit support system, and at least the two ends of the upper chord member are detachably connected to the enclosure. The connecting member is connected between the upper chord member and the lower chord member. In the support member provided in the present application, since it is spliced ​​with prefabricated chord members and connecting members, the upper chord member can be dismantled and reused after the construction is completed, and the lower chord member can be used in the station roof to continue to provide support for the station roof, thereby reducing the difficulty of construction.

Description

Technical Field

[0001] The present application relates to the technical field of subway station construction, and in particular to a supporting member, a foundation pit support system, and a construction method for a subway station. Background Art

[0002] During the construction of subway stations, in order to prevent the soil around the foundation pit from collapsing and flowing into the foundation pit, affecting the normal station construction work, the foundation pit needs to be supported. Usually, the retaining body is used for enclosure before excavation, and then the supporting components are used to support the retaining body after excavation to prevent the retaining body from failing. As part of the support system in the foundation pit, the supporting components undertake a lot of support work.

[0003] In current technology, support components are usually formed in one piece by pouring concrete. Therefore, after the support work is completed, all support components need to be dismantled, resulting in a long construction period and a large workload, which results in a high degree of construction difficulty. Summary of the invention

[0004] In view of this, the embodiments of the present application hope to provide a support structure, a foundation pit support system and a construction method for a subway station to solve the problem of high difficulty in subway station construction.

[0005] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present application provides a support member for use in a foundation pit support system for constructing a subway station. The support member comprises: a chord member, two chord members are arranged at intervals up and down, and the two ends of each chord member are respectively connected to the enclosure of the foundation pit support system, and at least the two ends of the upper chord member are detachably connected to the enclosure; and a connecting member connected between the upper chord member and the lower chord member.

[0006] Furthermore, the chord member includes a plurality of spliced ​​intermediate chords and end chords respectively spliced ​​at both ends of the plurality of intermediate chords; adjacent intermediate chords and the end chords and the middle chord are connected via a flange structure.

[0007] Furthermore, the connecting member includes: a first connecting member, whose two ends are orthogonally connected to the upper chord member and the lower chord member respectively; and a second connecting member, one end of which is arranged at the connection between one of the first connecting members and the upper chord member, and the other end is arranged at the connection between another adjacent first connecting member and the lower chord member.

[0008] Further, two adjacent second connecting members are symmetrically arranged relative to the first connecting member; and / or, a distance between two adjacent first connecting members is 1 m to 3 m.

[0009] Further, an upper intermediate chord, a lower intermediate chord and at least one of the first connecting members form an intermediate splicing unit; and / or an upper end chord, a lower end chord and at least one of the first connecting members form an end splicing unit.

[0010] Further, the connecting member also includes a third connecting member, and the two third connecting members are symmetrically arranged in the middle of the supporting member; one end of each of the third connecting members is arranged in the middle of the upper chord member, and the other end is arranged at the connection between the adjacent first connecting member and the lower chord member; or, one end of each of the third connecting members is arranged in the middle of the lower chord member, and the other end is arranged at the connection between the adjacent first connecting member and the upper chord member.

[0011] The supporting member provided in the embodiment of the present application is formed by splicing prefabricated chord members and connectors, so that after the support work is completed, the upper chord members and connectors can be removed, and the lower chord members can be retained. The lower chord members, as part of the station roof, continue to provide support for the station roof. In this way, the removal of the lower chord members can be avoided, resource utilization is improved, construction time is saved, and construction difficulty is reduced.

[0012] A second aspect of an embodiment of the present application provides a foundation pit support system, comprising: a retaining body, in which a foundation pit is excavated; and a supporting member as described in any one of the above embodiments, wherein a plurality of the supporting members are arranged at intervals on the retaining body and are located above the foundation pit.

[0013] Furthermore, the enclosure body includes an enclosure wall, a crown beam and a retaining wall. The foundation pit is formed by excavating inside the enclosure wall. The crown beam is connected to the top of the enclosure wall, and the retaining wall is connected to the upper part of the crown beam. The upper chord member is detachably connected to the crown beam, and the lower chord member is connected to the enclosure wall.

[0014] Furthermore, the crown beam is provided with a first embedded connecting piece, and the upper chord member is detachably connected to the crown beam via the first embedded connecting piece.

[0015] Furthermore, the foundation pit support system also includes a support body located in the foundation pit, and two ends of the support body are connected to two opposite walls of the enclosure body.

[0016] The foundation pit support system provided in the embodiment of the present application has the same technical effect as any of the supporting components described above, and will not be repeated here.

[0017] A third aspect of the embodiments of the present application provides a construction method for a subway station, using the foundation pit support system described in any one of the above embodiments. The construction method includes:

[0018] Constructing the enclosure of the foundation pit support system;

[0019] excavating a foundation pit within the enclosure to a preset first depth;

[0020] installing the support member on the enclosure;

[0021] Excavating the foundation pit to a preset second depth;

[0022] Construct the main frame of the station, leaving the station roof empty;

[0023] Dismantle the main frame of the supporting member and retain the chord member at the lower part of the supporting member;

[0024] The station roof is constructed at the position of the lower chord member.

[0025] The construction method of the subway station provided in the embodiment of the present application has the same technical effect as the foundation pit support system provided by any of the above embodiments, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a foundation pit support system provided in one embodiment of the present application;

[0027] Figure 2a A front view of a middle chord provided in one embodiment of the present application in one direction;

[0028] Figure 2b for Figure 2a A side view of the flange structure; and

[0029] Figure 3 A flowchart of a subway station construction method provided in one embodiment of the present application.

[0030] Description of reference numerals:

[0031] 100. Support member; 1. Chord member; 11. Intermediate chord member; 12. End chord member; 21. Intermediate splicing unit; 22. End splicing unit; 3. Flange structure; 31. Mounting hole; 4. Connector; 41. First connector; 42. Second connector; 43. Third connector.

[0032] 200, enclosure; 210, enclosure wall; 211, second embedded connector; 220, crown beam; 221, first embedded connector; 230, retaining wall; 300, support body.

[0033] 410, station roof; 420, station middle plate; 430, station bottom plate. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0035] The orientation terms described in this application are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0036] During the construction of the foundation pit of the subway station, usually before excavation, the enclosure 200 is constructed first, and then the foundation pit support system is continuously constructed in the foundation pit while excavating from top to bottom. When the bottom is dug, the subway station is built from bottom to top. In the process of building the subway station, part of the structure of the foundation pit support system is removed from bottom to top. As the first support of the foundation pit support system, the support member 100 is installed first, and is removed last when the station top plate 410 needs to be built. Therefore, the support member 100 undertakes important support work in the foundation pit support system. In the prior art, the support member 100 is usually cast on site with concrete. After the support work is completed, the support member 100 is usually removed by chiseling, and then the station top plate 410 is rebuilt at the corresponding position. This not only causes a longer construction period, but also causes a certain degree of waste of resources.

[0037] In view of this, a first aspect of an embodiment of the present application provides a support member 100 for use in a foundation pit support system for constructing a subway station. Figure 1 The supporting member 100 includes a chord member 1 and a connecting member 4. The two chord members 1 are arranged at intervals in the upper and lower parts, and the two ends of each chord member 1 are respectively connected to the enclosure 200 of the foundation pit support system, and at least the two ends of the upper chord member 1 are detachably connected to the enclosure 200. The connecting member 4 is connected between the upper chord member 1 and the lower chord member 1.

[0038] In one embodiment, see Figure 1, taking the application of the support member 100 provided in the present application in the foundation pit support system as an example. The foundation pit support system includes a retaining body 200 and a support member 100. A foundation pit is formed by excavating inside the retaining body 200. A plurality of support members 100 are arranged on the retaining body 200 at intervals and are located above the foundation pit. By arranging the support member 100 between two parallel walls inside the retaining body 20, a resistance force perpendicular to the inner wall of the foundation pit is provided to the retaining body 200, thereby improving the support strength of the retaining body 200. In order to ensure that the retaining body 200 has sufficient support strength, the support member 100 is required to have a relatively high strength. The support member 100 provided in the present application is connected between the upper and lower parallel chord members 1 using a prefabricated connector 4 to form the support member 100.

[0039] When it is necessary to build the station roof 410, the upper chord member 1 and the connecting member 4 are removed, while the lower chord member 1 is retained. A plurality of chord members 1 spaced apart in the horizontal direction are staggeredly connected with a plurality of connecting beams (not shown) to together constitute a part of the frame structure of the station roof 410. Finally, concrete is poured on the frame structure to form the station roof 410.

[0040] The supporting member 100 provided in the embodiment of the present application is formed by splicing prefabricated chord members 1 and connectors 4, so that after the support work is completed, the upper chord members 1 and connectors 4 can be removed, and the lower chord members 1 are retained. The lower chord members 1 serve as part of the station roof 410 and continue to provide support for the station roof 410. In this way, not only can the upper chord members 1 be reused after being removed, but also the removal of the lower chord members 1 can be avoided, which improves resource utilization and saves construction time, thereby reducing construction difficulty.

[0041] Preferably, in order to ensure the supporting strength of the chord member 1 and the connecting member 4 and reduce the cost, the chord member 1 and the connecting member 4 are both cast by concrete.

[0042] In one embodiment, see Figure 1 In the support member 100 provided in the present application, the chord member 1 includes a plurality of spliced ​​intermediate chords 11 and end chords 12 spliced ​​at both ends of the plurality of intermediate chords 11. The adjacent intermediate chords 11 and the end chords 12 and the intermediate chords 11 are connected by flange structures 3, see Figure 2a and Figure 2b The chord member 1 is formed by splicing a plurality of intermediate chords 11 and end chords 12 at both ends. The number of intermediate chords 11 can be flexibly selected during the assembly process according to the length required during construction.

[0043] Specifically, see Figure 2a and Figure 2bThe flange structure 3 is arranged at the end of the middle chord 11 or the end chord 12, and a mounting hole 31 is formed around it near the boundary. The adjacent middle chords 11, or the middle chord 11 and the end chord 12 cooperate with each other through the flange structure 3. After the mounting holes 31 of the two flange structures 3 are aligned, they can be fastened with fasteners. When it is necessary to remove, the fasteners can be removed. This connection method is simple and efficient, easy to disassemble and assemble, and easy to reuse the middle chord 11 and the end chord 12.

[0044] In one embodiment, see Figure 1 In the support member 100 provided in the present application, the connector 4 includes a first connector 41 and a second connector 42. The two ends of the first connector 41 are orthogonally connected to the upper chord member 1 and the lower chord member 1, respectively. One end of the second connector 42 is arranged at the connection between a first connector 41 and the upper chord member 1, and the other end is arranged at the connection between another adjacent first connector 41 and the lower chord member 1. By arranging the first connector 41 to be orthogonally connected to the upper chord member 1 and the lower chord member 1, respectively, the first connector 41 provides a supporting force in the vertical direction for the chord member 1. The second connector 22 is arranged obliquely to provide a supporting force in the oblique direction for the chord member 1, further improving the supporting strength of the support member 100 to the enclosure 200.

[0045] Further, in one embodiment, see Figure 1 In the support member 100 provided by the present application, two adjacent second connectors 42 are symmetrically arranged relative to the first connector 41. Thus, a three-point support is formed at the connection between the first connector 41 and the two second connectors 42 at the upper chord member 1 and the lower chord member 1, respectively, and the two adjacent second connectors 42 apply symmetrical forces to the upper chord member 1 or the lower chord member 1, which is conducive to the support member 100 being in a stable equilibrium state.

[0046] In one embodiment, in the support structure 100 provided by the present application, in order to ensure the strength of the support structure 100 itself and prevent the accident of failure of supporting the enclosure 200, the distance between two adjacent first connecting members 41 is 1m to 3m, for example, it can be 1m, 1.5m, 1.8m, 2m, 2.4m, 2.7m or 3m, etc., to avoid the interval between the first connecting members 41 being too long, which will cause the strength of the support structure 100 to be low and thus insufficient to provide effective support for the enclosure 200.

[0047] In one embodiment, see Figure 1In the support member 100 provided in the present application, an upper intermediate chord 11, a lower intermediate chord 11 and at least one first connecting member 41 constitute an intermediate splicing unit 21. Specifically, the intermediate splicing unit 21 may include one first connecting member 41, or may include two or more first connecting members 41, which may be selected according to actual construction requirements. During on-site construction, the intermediate splicing unit 21 may be spliced ​​as a whole. In this way, the prefabricated intermediate splicing unit 21 may be spliced ​​before construction, further reducing the time for on-site construction.

[0048] In one embodiment, see Figure 1 In the support member 100 provided by the present application, an upper end chord rod 12, a lower end chord rod 12 and at least one first connecting member 41 form an end splicing unit 22. Like the middle splicing unit 21, the end splicing unit 22 can be spliced ​​before construction to avoid assembling one by one on site, thereby reducing the construction difficulty and saving on-site construction time.

[0049] It can be understood that when the middle splicing unit 21 and the end splicing unit 22 are used at the same time, during the on-site construction process, it is only necessary to splice several middle splicing units 21 between the two end splicing units 22 to complete the assembly of the on-site support component 100, which greatly reduces the time for assembly and disassembly of the on-site support component 100.

[0050] It should be noted that the middle splicing unit 21 can be formed by pouring concrete separately with the middle chord 11 and the first connecting piece 41, and then connected together by the connecting piece to form the middle splicing unit 21, or it can be formed in one piece during the concrete pouring process. Similarly, the end splicing unit 22 can be formed by pouring concrete separately with the end chord 12 and the first connecting piece 41, and then connected together by the connecting piece to form the end splicing unit 22, or it can be formed in one piece during the concrete pouring process.

[0051] In one embodiment, see Figure 1In the support member 100 provided in the present application, the connector 4 also includes a third connector 43, and two third connectors 43 are symmetrically arranged in the middle of the support member 100. One end of each third connector 43 is arranged in the middle of the upper chord member 1, and the other end is arranged at the connection between the adjacent first connector 41 and the lower chord member 1. It can be understood that compared with the two-node support of the first connector 41 and the second connector 42, the combination of the two third connectors 43 and one first connector forms a three-point support, which can provide a stronger support strength for the support member 100. When the support member 100 provides support for the enclosure 200 at both ends, the middle part of the support member 100 will be subjected to a large bending stress. By arranging two third connectors 43 and one first connector in the middle part of the support member 100, the structural strength of the middle part can be improved, and the support member 100 can be prevented from deformation or fracture.

[0052] Optionally, in an embodiment not shown, in the support member 100 provided by the present application, one end of each third connecting member 43 is arranged at the middle of the lower chord member 1, and the other end is arranged at the connection between the adjacent first connecting member 41 and the upper chord member 1. This embodiment has the same technical effect as the technical solution in the previous embodiment in which one end of the third connecting member is arranged at the middle of the upper chord member 1, and will not be described in detail here.

[0053] The second aspect of the embodiment of the present application provides a foundation pit support system. Figure 1 The foundation pit support system includes a protection body 200 and a support member 100 provided in any one of the above embodiments, and a foundation pit is formed by excavating inside the protection body 200. A plurality of support members 100 are arranged on the protection body 200 at intervals and are located above the foundation pit.

[0054] The foundation pit support system provided in the embodiment of the present application has the same technical effect as the support member 100 provided in any of the above embodiments, and will not be described in detail here.

[0055] Further, in one embodiment, see Figure 1In the foundation pit support system provided by the present application, the enclosure 200 includes a enclosure wall 210, a crown beam 220 and a retaining wall 230. A foundation pit is formed by excavating inside the enclosure wall 210, the crown beam 220 is connected to the top of the enclosure wall 210, and the retaining wall 230 is connected to the upper part of the crown beam 220. The upper chord member 1 is detachably connected to the crown beam 220, and the lower chord member 1 is connected to the enclosure wall 210. It can be understood that since the upper chord member 1 needs to be removed after the support work is completed, it is necessary to set a detachable connection between the chord member 1 and the enclosure 200, and by connecting the upper chord member 1 to the crown beam 220, it is not only convenient to connect the upper chord member 1 to the enclosure 200, but also convenient to remove it. The lower chord member 1 needs to be retained to continue to provide support for the station roof 410. Therefore, the lower chord member 1 and the enclosure 200 can be permanently connected. The tighter the connection between the two, the higher the support reliability.

[0056] It is understandable that the connection between the upper chord member 1 and the crown beam 220, and the lower chord member 1 and the enclosure wall 210 can be connected by flange connection, or pre-embedded connectors can be embedded in the enclosure wall 210 and the crown beam 220. Since the lower chord member 1 and the enclosure wall 210 can be permanently connected, they can be connected by pouring concrete at the connection between the two, or by welding.

[0057] In a preferred embodiment, see Figure 1 In the foundation pit support system provided by the present application, the crown beam 220 has a first embedded connector 221, and the upper chord member 1 is detachably connected to the crown beam 220 through the first embedded connector 221. Specifically, the first embedded connector 221 can be an embedded anchor bolt or a bolt, and in this case, the upper chord member 1 should have an assembly hole that matches it. The first embedded connector 221 not only improves the connection strength between the upper chord member 1 and the crown beam 220, but also improves the convenience of connecting the two.

[0058] In one embodiment, see Figure 1 In the foundation pit support system provided by the present application, the enclosure wall 210 has a second embedded connector 211, and the lower chord member 1 is connected to the enclosure wall 210 through the second embedded connector 211. Specifically, the first embedded connector 221 can be an embedded anchor bolt or bolt, and in this case, the lower chord member 2 should have an assembly hole that matches it. In addition, since the lower chord member 2 and the enclosure wall 210 can be permanently connected, a steel member can also be embedded at the matching point of the two, and the connection between the two can be achieved by welding.

[0059] In one embodiment, see Figure 1, the foundation pit support system provided in the present application also includes a support body 300 located in the foundation pit. The two ends of the support body 300 are connected to two opposite walls of the enclosure 200. It can be understood that as the excavation depth of the foundation pit increases, it is not enough to rely solely on the support structure 100 to provide support for the enclosure 200. It is necessary to continuously install the support body 300 on the walls at both ends of the enclosure 200 to provide effective support for the enclosure 200. Depending on the depth of the foundation pit and the distance between the two opposite walls of the enclosure 200 in the foundation pit, the supporting force required by the enclosure 200 is also different. Therefore, an appropriate number of support bodies 300 can be set according to the needs of on-site construction.

[0060] In one embodiment, in the foundation pit support system provided in the present application, the support body 300 is made of steel. It can be understood that steel has high bending strength and is reusable, which can not only meet the support requirements but also improve resource utilization.

[0061] It should be noted that in the process of constructing the station floor 430, the station middle plate 420 and the station roof 410 from bottom to top in the subway station, it is necessary to dismantle the support body 300 one by one in a timely manner so that the support body 300 can provide support for the enclosure 200 while not affecting the construction work of the subway station.

[0062] The third aspect of the embodiment of the present application provides a construction method for a subway station, see Figure 3 , using the foundation pit support system provided by any one of the above embodiments, the construction method includes:

[0063] S1, the enclosure 200 of the construction foundation pit support system;

[0064] S2, excavating a foundation pit in the enclosure 200 to a preset first depth;

[0065] S3, installing the support member 100 on the enclosure 200;

[0066] S4, excavating the foundation pit to a preset second depth;

[0067] S5. Construct the main frame of the station, leaving the station roof 410 empty;

[0068] S6, dismantling the main frame of the supporting member 100, and retaining the chord member 1 at the lower part of the supporting member 100;

[0069] S7. Constructing the station roof 410 at the position of the lower chord member 1.

[0070] The construction method of the subway station provided in the embodiment of the present application has the same technical effect as the foundation pit support system provided in any of the above embodiments, and will not be repeated here.

[0071] It should be noted that, during the excavation of the foundation pit, the support member 100 needs to be installed between the walls opposite to the enclosure 200, and the preset first depth in step S2 is the depth at which the support member 100 can be constructed, which is determined according to the preset installation position of the support member 100. The foundation pit is continued to be excavated. During the excavation of the foundation pit, the support body 300 needs to be installed at a corresponding depth according to the bearing capacity of the enclosure 200 and the width of the foundation pit.

[0072] According to the designed position of the station floor 430, when the second preset depth is reached, that is, when the station floor 430 can be constructed, the digging is stopped and the main frame of the station is constructed, including the station floor 430, the station wall, the station stand columns and the station middle plate 420. It can be understood that in the process of constructing the main frame of the station from bottom to top, the support body 300 should be removed from bottom to top in sequence.

[0073] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A supporting member used in a foundation pit support system for constructing a subway station, characterized in that: The supporting member comprises: A chord member, wherein two chord members are arranged at intervals in an upper and lower direction, and both ends of each chord member are respectively connected to the enclosure of the foundation pit support system, and at least both ends of the upper chord member are detachably connected to the enclosure; and A connecting member connected between the upper chord member and the lower chord member; The chord member at the lower portion is permanently connected to the enclosure; A plurality of chord members spaced apart in the horizontal direction are staggeredly connected with a plurality of connecting beams to form together a part of the frame structure of the station roof; the supporting member is formed by splicing the prefabricated chord members and the connecting members.

2. The support member according to claim 1, characterized in that The chord member includes a plurality of spliced ​​middle chords and end chords respectively spliced ​​at both ends of the plurality of middle chords; The adjacent middle chord bars and the end chord bars and the middle chord bars are connected via flange structures.

3. The support member according to claim 2, characterized in that The connecting piece comprises: A first connecting member, two ends of which are orthogonally connected to the upper chord member and the lower chord member respectively; and A second connecting member, one end of which is arranged at the connection between one of the first connecting members and the upper chord member, and the other end of which is arranged at the connection between another adjacent first connecting member and the lower chord member.

4. The support member according to claim 3, characterized in that Two adjacent second connecting members are symmetrically arranged relative to the first connecting member; and / or, The distance between two adjacent first connecting members is 1m to 3m.

5. The support member according to claim 3, characterized in that An upper intermediate chord, a lower intermediate chord and at least one of the first connecting members form an intermediate splicing unit; and / or, An upper end chord, a lower end chord and at least one first connecting member form an end splicing unit.

6. The support member according to claim 3, characterized in that The connecting member further comprises a third connecting member, and two third connecting members are symmetrically arranged in the middle of the supporting member; One end of each of the third connecting members is arranged at the middle of the upper chord member, and the other end is arranged at the connection between the adjacent first connecting member and the lower chord member; or, One end of each of the third connecting members is arranged at the middle of the lower chord member, and the other end is arranged at the connection between the adjacent first connecting member and the upper chord member.

7. A foundation pit support system, characterized in that: include: A retaining body, wherein a foundation pit is formed by excavating inside the retaining body; as well as The supporting structure described in any one of claims 1 to 6, wherein a plurality of the supporting structures are arranged at intervals on the enclosure and are located above the foundation pit.

8. The foundation pit support system according to claim 7, characterized in that: The enclosure body includes an enclosure wall, a crown beam and a retaining wall. The foundation pit is formed by excavating the enclosure wall. The crown beam is connected to the top of the enclosure wall, and the retaining wall is connected to the upper part of the crown beam. The upper chord member is detachably connected to the crown beam, and the lower chord member is connected to the enclosure wall.

9. The foundation pit support system according to claim 8, characterized in that: The crown beam is provided with a first embedded connecting piece, and the upper chord member is detachably connected to the crown beam via the first embedded connecting piece.

10. The foundation pit support system according to any one of claims 7 to 9, characterized in that: The foundation pit support system also includes a support body located in the foundation pit, and two ends of the support body are connected to two opposite walls of the enclosure.

11. A method for constructing a subway station, using the foundation pit support system according to any one of claims 7 to 10, characterized in that: The construction method comprises: Constructing the enclosure of the foundation pit support system; excavating a foundation pit within the enclosure to a preset first depth; installing the support member on the enclosure; Excavating the foundation pit to a preset second depth; Construct the main frame of the station, leaving the station roof empty; Dismantle the main frame of the supporting member and retain the chord member at the lower part of the supporting member; The station roof is constructed at the position of the lower chord member.

Images