A simultaneous forward and reverse construction method suitable for subway tunneling first and then station construction

Abstract

This application discloses a simultaneous forward and reverse construction method applicable to subway tunnel construction, which involves constructing several upper subway station floors using the forward construction method, retaining the earthwork of several lower subway station floors, and reserving an earthwork transportation channel. The shield tunnel section of the subway station is completed during the forward construction of the upper subway station floors. After the shield tunnel section of the subway station is completed, the lower subway station floors are completed using the reverse construction method, and the earthwork of the lower subway station floors is transported out through the earthwork transportation channel, while the shield segments at the corresponding locations are removed. This application has the effect of reducing the adverse impact on the goal of achieving full line connection when the main structure of the subway station cannot be started as planned.

Description

Technical Field

[0001] The present invention relates to the field of subway station construction, and in particular to a simultaneous forward and reverse construction method suitable for subways that first build a tunnel and then a station. Background Art

[0002] The delay in the start of construction of the main structure of the station will also lead to conflicts between the construction period of the main structure of the subway station and the construction period of the tunnel, resulting in the tunnel not being completed on time and affecting the goal of achieving the node of full line connection. Summary of the Invention

[0003] In order to reduce the adverse impact on the goal of achieving full line connection when the main structure of the subway station cannot be started as planned, the present application provides a simultaneous forward and reverse construction method suitable for subway tunnels first and then stations.

[0004] The present application provides a simultaneous forward and reverse construction method for subway tunneling followed by stations, which adopts the following technical solutions:

[0005] A simultaneous forward and reverse construction method for subway tunnel construction followed by station construction includes the following steps:

[0006] Construction of retaining structures and temporary supports: Construction of retaining piles and temporary column piles. The location of the temporary column piles should avoid the designed location of the shield tunnel section of the subway station. Construction of the crown beam and the first concrete support should also be completed.

[0007] Construct the upper several subway station floors using the sequential construction method: excavate the earth and stone of the upper several subway station floors and complete the concrete support construction of the corresponding layers, retain the earth and stone of the lower several subway station floors, and then use the sequential construction method to construct the upper several subway station floors after excavation, and reserve a transportation channel for the earth and stone;

[0008] Shield construction: After the concrete support strength of the sequential construction method reaches the required level, and the concrete support strength of the corresponding layers of the upper subway station reaches the required level, the shield machine will excavate from one side of the retaining piles into the earth and rock inside the subway station, and continue to excavate forward through the subway station, leaving the subway station from the other side of the retaining piles, completing the construction of the shield section of the subway station;

[0009] The reverse construction method is used to construct the lower several floors of the subway station: After the construction of the shield section of the subway station is completed, the reverse construction method is used to construct the lower several floors of the subway station. The earth and stone of the lower several floors of the subway station are transported out from the earth and stone transportation channel, and the shield segments at the corresponding positions are broken at the same time.

[0010] By adopting the above technical solution, the present application adopts a combination of the forward construction method and the reverse construction method to construct the main structure of the subway station. The forward construction method is used to construct the upper several floors of the subway station, while the earth and stone of the lower several floors of the subway station are retained, so that the shield machine can smoothly pass through the subway station during the construction of the upper several floors of the subway station and complete the construction of the shield section of the subway station, thereby reducing the adverse impact on the tunnel construction period when the main structure of the subway station cannot be started as planned; the construction of the subway main structure and the construction of the shield section can overlap, and after the construction of the shield section is completed, the forward construction part of the subway station main body and the reverse construction part can be completed. The construction parts of the method can be carried out simultaneously, thereby improving construction efficiency and shortening the construction period of the main body of the subway station; since the internal supporting force of the retaining piles is weakened after the excavation of several upper layers of earth and stone, if the shield construction passes through the retaining piles at this time, it will cause greater disturbance to the retaining piles. The shield section of the subway station in this application is carried out after the strength of the concrete support constructed by the forward construction method meets the requirements. The concrete support improves the stability of the retaining piles after the excavation of several upper layers of earth and stone, and reduces the disturbance of the retaining piles by the shield construction; therefore, this application can reduce the adverse impact on the goal of the full line through node when the main structure of the subway station cannot be started as planned.

[0011] Preferably, the location where the retaining piles overlap with the designed subway station shield section is where the steel cage is tied with glass fiber reinforcement.

[0012] By adopting the above technical solution and using glass fiber reinforcement instead of ordinary reinforcement, it is possible to reduce the wear of the tool when the shield machine is excavating the retaining piles, thereby facilitating the excavation of the shield machine.

[0013] Preferably, when constructing retaining piles at a position that coincides with the designed shield section of the subway station, first drill the pile holes below the designed elevation, then backfill with concrete to the designed elevation. After the backfilled concrete solidifies, lower the steel cage, and finally cast the retaining piles to ensure that the position of the fiberglass reinforcement is aligned with the shield section.

[0014] By adopting the above technical solution, backfilling concrete at the bottom of the pile hole to the designed elevation is beneficial to keep the position of the fiberglass reinforcement aligned with the designed subway station shield section and reduce the position error of the retaining piles.

[0015] Preferably, after the shield tunneling section of the subway station is completed, the unfinished portions of the upper several floors of the subway station are constructed simultaneously with the lower several floors of the subway station.

[0016] By adopting the above-mentioned technical solution, construction can be carried out simultaneously upwards and downwards, which can improve the construction efficiency of the main structure of the subway station, shorten the construction period of the subway station, and facilitate the completion of the goal of connecting the entire line to the node.

[0017] Preferably, the method for removing the shield segments is as follows: first, the earth and stone on the upper part and both sides of the shield section of the subway station are excavated and transported away, and then an opening for people to enter and exit is cut on the shield segment in the middle of the shield section of the subway station, a through hole is drilled on the shield segment at intervals using a drilling rig, a hook bolt is installed in each through hole and the hook bolt is fixed to the shield segment using a nut, a cutting device is used to cut the shield segment into a ring containing the hook bolt, and finally the cut block shield segment is lifted away by connecting the hook bolt with a crane.

[0018] By adopting the above technical solution, the shield segments are broken in rings, and the breaking efficiency is high; the hook bolts are fixedly connected to the shield segments and provide crane connection points, which makes it easy for the crane to lift the shield segments away, and the lifting speed is fast.

[0019] Preferably, the cutting device includes a trolley, a bracket and a cutting machine, the bracket is rotatably connected to the trolley through a rotating shaft, a slide rail is radially installed on the bracket, the cutting machine is installed on the slide rail and can slide along the slide rail, the cutting machine is connected to a hydraulic cylinder, the axis of the hydraulic cylinder is parallel to the axis of the slide rail, and the hydraulic cylinder can drive the cutting machine to move along the slide rail.

[0020] By adopting the above technical solution, the hydraulic cylinder extends and moves the cutting machine closer to the shield segment, so that the cutting machine can cut through the shield segment. The bracket is then rotated to drive the cutting machine to circle the shield segment, thereby cutting the shield segment in a circle and completing the cutting of the shield segment at that position. The hydraulic cylinder then drives the cutting machine to retract and pushes the trolley forward to the next cutting position, and the cutting operation is performed again. This cycle is repeated to complete the cutting of the shield segment in the entire shield section of the subway station.

[0021] Preferably, the trolley includes a frame and a plurality of wheels, the plurality of wheels are respectively mounted on the circumference of the frame through the wheel frames, and the distance between the wheel frames and the center line of the frame is adjustable.

[0022] By adopting the above technical solution, the distance between the wheel frame and the center line of the frame is adjusted so that each wheel can be attached to the inner wall of the shield segment, keeping the frame stable, which is beneficial to the cutting operation of the cutting machine.

[0023] Preferably, the rotating shaft is connected to a handle, and the handle is provided on a side of the trolley facing away from the bracket.

[0024] By adopting the above technical solution, by shaking the handle behind the trolley, the bracket can be driven to rotate, thereby operating the cutting machine to cut the shield pipe segment.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. This application adopts a combination of the sequential construction method and the reverse construction method to construct the main structure of the subway station. The sequential construction method is used to construct the upper several floors of the subway station, while the earth and stone of the lower several floors of the subway station are retained, so that the shield machine can smoothly pass through the subway station during the construction of the upper several floors of the subway station and complete the construction of the shield section of the subway station, thereby reducing the adverse impact on the tunnel construction period when the main structure of the subway station cannot be started as planned; the construction of the subway main structure and the construction of the shield section can overlap, and after the construction of the shield section is completed, the sequential construction part and the reverse construction part of the subway station main body can be The tunneling process can be carried out simultaneously, thereby improving construction efficiency and shortening the construction period of the main structure of the subway station. Since the internal supporting force of the retaining piles is weakened after the excavation of several layers of earth and stone in the upper part, if the shield construction passes through the retaining piles at this time, it will cause great disturbance to the retaining piles. The shield section of the subway station in this application is carried out after the strength of the concrete support constructed by the sequential construction method reaches the required level. The concrete support improves the stability of the retaining piles after the excavation of several layers of earth and stone in the upper part, and reduces the disturbance of the retaining piles by the shield construction. Therefore, this application can reduce the adverse impact on the goal of the full line connection node when the main structure of the subway station cannot be started as planned.

[0027] 2. After the shield tunneling section of the subway station is completed, it will be possible to simultaneously carry out both forward and reverse construction, improving the construction efficiency of the main structure of the subway station, shortening the construction period of the subway station, and facilitating the completion of the entire line through the node goal;

[0028] 3. Before cutting the shield segments, the hook bolts are installed first to provide a crane connection point, which makes it easier for the crane to lift the shield segments away and the lifting speed is fast; the shield segments are broken in rings, which has high breaking efficiency and is conducive to recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flowchart of a simultaneous forward and reverse construction method applicable to a subway tunnel-first and station-later construction method according to the first embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the working conditions of earth excavation at the underground first and second floors of the subway station in Example 1 of the present application.

[0031] Figure 3 This is a schematic diagram of the working conditions of the negative second floor middle plate construction in Example 1 of the present application.

[0032] Figure 4 This is a schematic diagram of the construction conditions of the side walls and central columns of the negative second floor of Example 1 of the present application.

[0033] Figure 5 It is a schematic diagram of the working conditions of the top plate construction of Example 1 of the present application.

[0034] Figure 6This is a schematic diagram of the working conditions of the negative third floor middle plate construction in Example 1 of the present application.

[0035] Figure 7 This is a schematic diagram of the construction conditions of the negative third floor side walls and central columns of Example 1 of the present application.

[0036] Figure 8 It is a schematic diagram of the working conditions of the base plate construction of Example 1 of the present application.

[0037] Figure 9 This is a schematic diagram of the construction conditions of the negative fourth floor side walls and central columns of Example 1 of the present application.

[0038] Figure 10 This is a schematic diagram of the working conditions for the simultaneous construction of the negative third floor middle plate, negative second floor side walls and center column in Example 2 of the present application.

[0039] Figure 11 This is a schematic diagram of the working conditions for the simultaneous construction of the basement level 1 middle plate and the basement level 3 side walls and center columns of Example 2 of the present application.

[0040] Figure 12 This is a schematic diagram of the working conditions for the simultaneous construction of the base plate, the side walls of the first basement floor, and the central column in Example 2 of the present application.

[0041] Figure 13 This is a schematic diagram of the working conditions for the simultaneous construction of the top plate, the negative fourth floor side walls and the central column of Example 2 of the present application.

[0042] Figure 14 It is a structural schematic diagram of the cutting device of Example 3 of the present application.

[0043] Description of reference numerals:

[0044] 1. Retaining piles; 2. Temporary column piles; 3. First concrete support; 4. Second concrete support; 5. Third concrete support; 6. Middle plate of the second negative floor; 7. Shield tunnel section of subway station; 8. Side walls and center column of the second negative floor; 9. Middle plate of the first negative floor; 10. Side walls and center column of the first negative floor; 11. Top plate; 12. Middle plate of the third negative floor; 13. Side walls and center column of the third negative floor; 14. Bottom plate; 15. Side walls and center column of the fourth negative floor; 16. Trolley; 17. Cutting machine; 18. Bracket; 19. Hydraulic cylinder; 20. Slide rail; 21. Rotating shaft; 22. Handle. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-14 This application is described in further detail.

[0046] The embodiment of the present application discloses a simultaneous forward and reverse construction method applicable to subway tunnel construction followed by station construction.

[0047] Example 1

[0048] The subway station in this embodiment has four floors, and the shield tunnel section passes through the negative fourth floor. Figure 1 A simultaneous forward and reverse construction method for subway tunnel construction followed by station construction includes the following steps:

[0049] Construction of enclosure structure and temporary support: refer to Figure 2 , construct retaining pile 1 and temporary column pile 2, and complete the waterstop curtain jet grouting. Pre-embed anchor bars at the corresponding locations of retaining pile 1 and temporary column pile 2. Where retaining pile 1 overlaps with the designed subway station shield section 7, fiberglass reinforcement is used to secure the steel cage. The fiberglass reinforcement extends one meter beyond the edge of the designed cross-section of subway station shield section 7. Temporary column pile 2 is positioned away from the designed location of subway station shield section 7. Then, construction of the crown beam and the first concrete support 3 is completed.

[0050] The construction of the underground first and second floors of the subway station is carried out in a sequential manner: the earthwork of the underground first floor subway station is excavated, and the second concrete support 4 is constructed, and the inter-pile net shotcrete construction is carried out at the same time. The earthwork of the underground second floor subway station is excavated, and the third concrete support 5 is constructed, and the inter-pile net shotcrete construction is carried out at the same time. The earthwork of the underground second floor subway station is excavated to the bottom of the underground second floor middle plate 6. Figure 3 Then, level the base, construct the ground formwork, strip out the pre-buried anchor bars on the retaining piles 1 and temporary column piles 2 corresponding to the position of the negative second floor middle plate 6, tie the negative second floor middle plate 6 steel bars and connect the stripped negative second floor anchor bars, and cast the negative second floor middle plate 6. Figure 4 After the strength of the negative second floor middle plate 6 reaches the required level, the third concrete support 5 is removed and the negative second floor side wall and middle column 8 are constructed. Figure 5 After the strength of the second-basement side walls and the center column 8 reaches the required level, the anchor bars pre-buried on the retaining piles 1 and the temporary column piles 2 at the corresponding positions of the first-basement middle plate 9 are stripped out, the first-basement formwork is built, the first-basement middle plate 9 reinforcement is tied and connected to the stripped-out first-basement anchor bars, and the first-basement middle plate 9 is cast. After the strength of the first-basement middle plate 9 reaches the required level, the second concrete support 4 is removed, and the first-basement side walls and the center column 10 are constructed. After the strength of the first-basement side walls and the center column 10 reaches the required level, the anchor bars pre-buried on the retaining piles 1 and the temporary column piles 2 at the corresponding positions of the top plate 11 are stripped out, the top plate 11 formwork is built, the top plate 11 reinforcement is tied and connected to the stripped-out top plate 11 anchor bars, and the top plate 11 is cast. Earthwork transportation channels are reserved in the second-basement middle plate 6, the first-basement middle plate 9, and the top plate 11.

[0051] Shield construction: refer to Figure 3 、 Figure 4 and Figure 5After the third concrete support 5 reached the required strength, the shield machine entered the earthwork of the underground subway station on the fourth floor below ground, starting from the location of the fiberglass reinforced retaining pile 1. It then continued its excavation, exiting the underground subway station on the other side of the fiberglass reinforced retaining pile 1, completing the construction of the subway station shield section 7. The construction of the subway station shield section 7 was carried out simultaneously with the construction of the second-basement middle slab 6, the first-basement middle slab 9, and the top slab 11.

[0052] Reverse construction method for underground third and fourth floor subway stations: Figure 6 After the construction of the subway station shield section 7 is completed, the earth and stone of the underground subway station on the third floor will be excavated downwards through the reserved earth and stone transportation channel. The anchor bars pre-buried on the retaining piles 1 and temporary column piles 2 corresponding to the position of the third floor middle plate 12 will be stripped out. The third floor formwork will be built, the third floor middle plate 12 steel bars will be tied and connected with the stripped third floor anchor bars. The third floor middle plate 12 will be cast. The earth and stone transportation channel will also be reserved for the third floor middle plate 12. Figure 7 After the strength of the negative third floor middle plate 12 reaches the required level, the negative third floor side walls and center columns 13 are constructed. Figure 8 After the strength of the side walls and central columns 13 of the negative third floor reaches the required level, continue to excavate the earth and stone of the negative fourth floor subway station, break the shield pipe segments in the negative fourth floor subway station, and then carry out comprehensive grounding construction and bottom plate 14 construction. Figure 9 , then the construction of the negative fourth floor side wall and the middle column 15 is carried out, the first concrete support 3 is removed, and then the temporary column pile 2 is removed, and finally the reserved hole and the internal structure are sealed.

[0053] The following method can be used for the construction of retaining piles 1 at a position that coincides with the designed shield section 7 of the subway station: first drill the pile hole below the designed elevation, then backfill it with concrete to the designed elevation. After the backfilled concrete solidifies, lower the steel cage, and finally cast the retaining piles 1, ensuring that the position of the fiberglass reinforcement is aligned with the shield section to reduce the position error of the retaining piles 1.

[0054] The implementation principle of the simultaneous forward and reverse construction method for subway tunnels first and stations later is as follows: the application adopts a combination of forward and reverse construction methods to construct the main structure of the subway station, adopts the forward construction method to construct several upper subway station floors, and retains the earth and stone of several lower subway station floors. The shield construction is carried out after the strength of the concrete support constructed by the forward construction method meets the requirements. The shield construction is carried out simultaneously during the construction of the first-floor subway station and the second-floor subway station, thereby reducing the adverse impact on the tunnel construction period when the main structure of the subway station cannot be started as planned, and shortening the construction period.

[0055] Example 2

[0056] The difference from the first embodiment is that the shield section 7 of the subway station is penetrated after the construction of the third concrete support 5 is completed and before the pouring of the negative second floor middle plate 6 is completed. Figure 10 The earthwork excavation of the underground subway station on the third floor was carried out simultaneously with the removal of the third concrete support 5, and the construction of the underground third floor middle plate 12 was carried out simultaneously with the construction of the underground second floor side wall and middle column 8. Figure 11 The construction of the basement floor middle plate 9 is carried out simultaneously with the construction of the basement floor side wall and center column 13. Figure 12 The earthwork excavation and shield segment removal of the underground subway station on the fourth floor were carried out simultaneously with the demolition of the second concrete support 4. The construction of the underground first floor side wall and central column 10 was carried out simultaneously with the construction of the comprehensive grounding and bottom plate 14. Figure 13 The construction of the top plate 11 is carried out simultaneously with the construction of the negative fourth floor side walls and the central column 15.

[0057] The operating principle of the above-described embodiment is as follows: the subway station shield tunnel section 7 is completed before the pouring of the second-basement middle slab 6. This allows for excavation of earthwork on the third and fourth-basement subway stations. Starting from the second-basement middle slab 6, construction can proceed both upwards and downwards simultaneously, improving construction efficiency. Furthermore, the removal of concrete supports is carried out simultaneously with earthwork excavation, facilitating the transportation and management of earthwork and waste materials. The construction of the side walls and center columns is synchronized with the corresponding middle slab construction, facilitating the storage and use of materials such as rebar and concrete, easing management, improving construction safety, increasing efficiency, and shortening the construction period.

[0058] Example 3

[0059] The difference from Example 2 is that the method for breaking the shield segment is: first, the earth and stone on the upper part and both sides of the subway station shield section 7 are excavated and transported away, and then an opening for people to enter and exit is cut on the shield segment in the middle of the subway station shield section 7, and a through hole is drilled on the shield segment at intervals using a drill rig, a hook bolt is installed in each through hole and the hook bolt is fixed to the shield segment using a nut, and a cutting device is used to cut the shield segment into a ring containing the hook bolt, and finally the cut block shield segment is lifted away by connecting the hook bolt with a crane.

[0060] Reference Figure 14The cutting device includes a trolley 16, a bracket 18, and a cutter 17. The bracket 18 is rotatably connected to the trolley 16 via a rotating shaft 21. The rotating shaft 21 is connected to a handle 22. The handle 22 is located on the side of the trolley 16 facing away from the bracket 18. The bracket 18 can be rotated by rotating the handle 22. A slide rail 20 is radially mounted on the bracket 18. The cutter 17 is slidably mounted on the slide rail 20 and can slide along the slide rail 20. The cutter 17 is connected to a hydraulic cylinder 19. The cylinder body of the hydraulic cylinder 19 is fixed to the slide rail 20. The piston rod of the hydraulic cylinder 19 is fixedly connected to the cutter 17. The axis of the hydraulic cylinder 19 is parallel to the axis of the slide rail 20. The hydraulic cylinder 19 can drive the cutter 17 to move along the slide rail 20. The trolley 16 includes a frame and multiple wheels. The wheels are mounted on the circumference of the frame via the wheel frames. The wheel frames are fixedly connected to the frame via screws and nuts. By adjusting the extension length of the screws, the distance between the wheel and the centerline of the frame can be adjusted, so that each wheel can be attached to the inner wall of the shield segment, maintaining the stability of the trolley 16 and reducing its shaking. The frame and bracket 18 are fixedly connected by multiple rods, which are fixedly connected by bolts. The trolley 16 can be disassembled and assembled. It is first disassembled outside the shield segment and moved into the shield segment, and then assembled inside the shield segment. The annular shield segment cut by the cutting device can be pushed by equipment such as a bulldozer, so that the annular shield segment rolls to the earthwork transportation channel and is then lifted out of the subway station by a crane.

[0061] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A simultaneous forward and reverse construction method for subway tunnel construction followed by station construction, characterized in that: The steps include: Construction of retaining structures and temporary supports: Construction of retaining piles and temporary column piles. The location of the temporary column piles should avoid the designed location of the shield tunnel section of the subway station. Construction of the crown beam and the first concrete support should also be completed. Construct the upper several subway station floors using the sequential construction method: excavate the earth and stone of the upper several subway station floors and complete the concrete support construction of the corresponding layers, retain the earth and stone of the lower several subway station floors, and then use the sequential construction method to construct the upper several subway station floors after excavation, and reserve a transportation channel for the earth and stone; Shield construction: After the concrete support constructed by the sequential construction method reaches the required strength, the shield machine excavates from one side of the retaining pile into the earth and rock inside the subway station, and continues to excavate through the subway station, leaving the subway station from the other side of the retaining pile, completing the construction of the shield section of the subway station; Reverse construction of the lower several subway station floors: After the shield tunnel section of the subway station is completed, the reverse construction of the lower several subway station floors is used. The earth and stone of the lower several subway station floors are transported out through the earth and stone transportation channel, and the shield segments at the corresponding positions are broken at the same time; After the shield tunneling section of the subway station is completed, the unfinished sections of the upper several floors of the subway station will be constructed simultaneously with the lower several floors of the subway station; The method for removing the shield segments is as follows: first, the earth and rock on the upper part and both sides of the shield section of the subway station are excavated and removed. Then, an opening for people to enter and exit is cut on the shield segment in the middle of the shield section of the subway station. A through hole is drilled on the shield segment at regular intervals using a drilling rig. A hook bolt is installed in each through hole and fixed to the shield segment using a nut. The shield segment is cut into a ring containing the hook bolt using a cutting device. Finally, the cut block shield segment is lifted away by connecting the hook bolt with a crane. The cutting device includes a trolley, a bracket and a cutting machine. The bracket is rotatably connected to the trolley through a rotating shaft. A slide rail is radially installed on the bracket. The cutter is installed on the slide rail and can slide along the slide rail. The cutter is connected to a hydraulic cylinder. The axis of the hydraulic cylinder is parallel to the axis of the slide rail. The hydraulic cylinder can drive the cutter to move along the slide rail.

2. The method for simultaneous forward and reverse construction of a subway tunnel first and then a station according to claim 1 is characterized in that: Glass fiber reinforcement is used to tie the steel cage where the retaining piles overlap with the designed shield section of the subway station.

3. The method for simultaneous forward and reverse construction of a subway tunnel before a station according to claim 2 is characterized in that: When constructing retaining piles at a position that coincides with the designed shield section of the subway station, first drill the pile holes below the designed elevation, then backfill with concrete to the designed elevation. After the backfill concrete solidifies, lower the steel cage, and finally cast the retaining piles to ensure that the position of the fiberglass reinforcement is aligned with the shield section.

4. The method for simultaneous forward and reverse construction of a subway tunnel before a station according to claim 1 is characterized in that: The trolley comprises a frame and a plurality of wheels, wherein the plurality of wheels are respectively mounted on the circumference of the frame through wheel frames, and the distance between the wheel frames and the center line of the frame can be adjusted.

5. The method for simultaneous forward and reverse construction of a subway tunnel before a station according to claim 1 is characterized in that: The rotating shaft is connected with a handle, and the handle is arranged on a side of the trolley facing away from the bracket.

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