Back wall structure for pipe jacking starting

Abstract

The back wall structure for pipe jacking starting is applied to the technical field of pipe jacking construction, the back wall structure for pipe jacking starting comprises a starting well, an inner wall and a back wall, and the starting well is located in a subway station; the inner wall is arranged on the side wall of the launching well; the back wall is at least partially connected with the inner wall and at least partially extends in the direction away from the starting well. Wherein the back wall is of a T-shaped structure, and the back wall is used for bearing back leaning reaction force during pipe jacking construction. According to the back wall structure for pipe jacking starting, pushing force can be provided for pipe jacking through the bending bearing capacity of the T-shaped back wall, the adverse condition that no passive earth pressure exists in a station is overcome, pipe jacking starting in the station has the implementation condition, and due to the existence of the back wall, soil collapse can be prevented, the construction area can be protected, and the bearing capacity of the back wall is enhanced; and the risks of collapse and deformation are reduced.

Description

Technical Field

[0001] This application relates to the field of pipe jacking construction technology, specifically to a back wall structure for pipe jacking initiation. Background Technology

[0002] Pipe jacking construction technology is widely used in underground municipal structures, and is especially common in subway station ancillary projects. It is usually used to avoid the impact of open-cut construction on surrounding buildings, important pipelines and main traffic.

[0003] In general, subway pipe jacking construction starts in the auxiliary structure. However, some special underground structures make it difficult to start the pipe jacking in the auxiliary structure. However, adding a pipe jacking starting shaft outside the station will increase the project investment, extend the construction period, and require higher requirements for the surrounding environment and space during construction.

[0004] In existing technologies, the back wall is vertically installed and is usually only connected to the side wall of the launching shaft. During pipe jacking construction, when the thrust applied by the pipe jacking is too large, the back wall may be subjected to excessive reaction force. In this case, the structural stability of the back wall is easily affected, which can easily lead to deformation or collapse of the back wall. The resulting deformation will not only affect the load-bearing capacity of the back wall, but also easily cause serious damage to the overall structure of the launching shaft, and even cause the collapse of the soil, affecting construction safety.

[0005] Therefore, the existing pipe jacking initiation structure has room for further improvement. Utility Model Content

[0006] In view of this, and in response to the technical problem of difficulty in starting pipe jacking in subway stations in the prior art, this application provides a back wall structure for starting pipe jacking. While meeting the functional requirements of underground stations, by setting a back wall in the main body of the station, the bending bearing capacity of the back wall provides the driving force for pipe jacking, overcoming the unfavorable condition of no passive earth pressure in the station, and making pipe jacking starting in the station feasible.

[0007] To achieve the above objectives, this application provides the following technical solution: a back wall structure for pipe jacking starting, comprising:

[0008] The launching shaft is located inside the subway station;

[0009] The inner wall is located on the side wall of the launching well;

[0010] A back wall, which is at least partially connected to the inner wall and extends at least partially toward a direction away from the launching well;

[0011] The back wall is a T-shaped structure, which is used to bear the reaction force of the pipe jacking construction.

[0012] Compared with existing technologies, the launching shaft is located inside the subway station, making full use of the station's main space for pipe jacking launch. This avoids the need for additional launching shafts outside the station, reducing project investment and shortening the construction period, and is less affected by the surrounding environment. The structure for pipe jacking launch inside the subway station in this application involves setting up a T-shaped back wall. The bending bearing capacity of the back wall can provide driving force for pipe jacking, overcoming the unfavorable condition of no passive earth pressure inside the station, making pipe jacking launch inside the station feasible. The presence of the back wall can also prevent soil collapse, protect the construction area, enhance the bearing capacity of the back wall, and reduce the risk of collapse and deformation.

[0013] The back wall includes a first support part and a second support part, the first support part is connected to the second support part, and the first support part and the second support part are at least partially connected to the inner wall.

[0014] Both the first and second support sections extend horizontally to the subway station floor slab and connect with it.

[0015] In this embodiment, by setting up a first support and a second support, the reaction force during the jacking of the pipe can be effectively transmitted to the wall of the underground floor of the subway station, effectively bearing the load generated during the jacking construction, reducing the deformation and displacement of the back wall, and ensuring construction safety.

[0016] Preferably, it also includes a central longitudinal beam, the bottom of which is at least partially connected to the inner wall and at least partially connected to the rear wall, and the central longitudinal beam is arranged parallel to the inner wall;

[0017] The central longitudinal beam is equipped with a haunch area, and the reaction force of the jacking pipe during jacking is applied to the station roof and central slab through the back wall.

[0018] In this embodiment, the reaction force during the jacking of the pipe is applied to the inner wall and the middle longitudinal beam through the back wall. The back wall disperses the reaction force to the station roof and middle slab, which helps to evenly distribute the load, reduce local stress concentration, thereby reducing the risk of damage to the back wall, effectively enhancing the stability of the starting shaft, and also preventing the back wall from deforming or collapsing due to the reaction force generated during the jacking process.

[0019] Preferably, it also includes a steel backrest, which is at least partially connected to the back wall and is used to bear the reaction force of the backrest during pipe jacking construction.

[0020] In this embodiment, during the pipe jacking construction process, the reaction force of the pipe jacking is transmitted through these connections, and the reaction force is evenly distributed to the back wall and the inner wall, avoiding local stress concentration, reducing structural deformation and displacement, and ensuring construction safety.

[0021] Preferably, the starting well is provided with an inlet and outlet for jacking pipe drilling, the inlet and outlet being located on the side opposite to the back wall, and the inlet and outlet being provided corresponding to the first support part;

[0022] Support beams are provided on both sides of the entrance and exit, and the support beams are connected to the side wall of the launching well to strengthen the entrance and exit of the launching well.

[0023] In this embodiment, by providing support beams on both sides of the entrance and exit, the strength and stability of the entrance and exit can be effectively enhanced. The support beams are connected to the side wall of the starting shaft and can provide additional support to strengthen the strength of the entrance and exit of the starting shaft and prevent the entrance and exit from deforming or collapsing due to load during the pipe jacking construction process.

[0024] Preferably, the first support portion includes multiple first vertical ribs and second vertical ribs. The first vertical ribs are arranged on both sides of the first support portion corresponding to the inlet and outlet of the launching well, and the second vertical ribs are arranged on the other two sides of the first support portion.

[0025] Both the first vertical rib and the second vertical rib are located on the longitudinal extension line of the first support.

[0026] In this embodiment, both the first vertical rib and the second vertical rib are arranged on the longitudinal extension line of the first support. With the ground as the horizontal plane as the reference plane, it means that the first vertical rib and the second vertical rib are perpendicular to the ground and form a 90° angle with the ground. The first vertical rib and the second vertical rib can effectively resist vertical loads and ensure the stability of the back wall during use.

[0027] Preferably, the second support portion includes multiple first reinforcing ribs and second reinforcing ribs. The second reinforcing ribs are disposed on the side of the second support portion away from the first support portion, and the first reinforcing ribs are disposed on opposite sides of the second support portion. The first reinforcing ribs are disposed parallel to the first vertical ribs.

[0028] Both the first reinforcing rib and the second reinforcing rib are arranged on the longitudinal extension line of the second support.

[0029] In this embodiment, both the first and second reinforcing ribs are arranged on the longitudinal extension line of the second support. With the ground as the horizontal plane as the reference plane, the first and second reinforcing ribs are perpendicular to the ground and form a 90° angle with the ground. The first and second reinforcing ribs can effectively resist vertical loads and ensure the stability of the back wall during use.

[0030] Preferably, the first support portion further includes a plurality of first transverse ribs and second transverse ribs, wherein the first transverse ribs at least partially cooperate with the first vertical ribs, and the second transverse ribs at least partially cooperate with the second vertical ribs, so as to provide support for the jacking of the pipe.

[0031] The second transverse reinforcement is located at least partially within the inner wall.

[0032] In this embodiment, during the pipe jacking process, the back wall is subjected to shear forces and influences. The presence of the first and second transverse ribs can effectively resist these shear forces and prevent structural damage to the back wall. At the same time, the cooperation between the first transverse rib and the first vertical rib, and the cooperation between the second transverse rib and the second vertical rib, can optimize the load transfer path, so that the load can be more evenly distributed throughout the entire back wall structure, reducing local stress concentration, reducing the risk of structural damage, enhancing the overall compressive strength of the back wall, and ensuring that the first and second support parts effectively bear the load from the pipe jacking during the pipe jacking process, maintaining the stability of the back wall structure.

[0033] Preferably, the second support part further includes a plurality of first support ribs and second support ribs, wherein the first support ribs at least partially cooperate with the second vertical ribs and at least partially cooperate with the first reinforcing ribs to provide support during the jacking of the pipe.

[0034] The second support rib is at least partially connected to the second reinforcing rib and extends at least partially in a direction away from the first support portion.

[0035] In this embodiment, the first and second support bars can improve the shear resistance of the back wall. During the jacking process, the back wall will be subjected to shear forces and influences. The presence of the first and second support bars can effectively resist these shear forces and prevent the structure of the back wall from being damaged.

[0036] Preferably, the second support portion further includes a plurality of third support ribs, which at least partially cooperate with the first reinforcing rib and at least partially cooperate with the second support rib to provide support during the jacking of the pipe.

[0037] In this embodiment, the third supporting bar can effectively provide the shear resistance of the back wall. The cooperation between the third supporting bar and the second reinforcing bar can optimize the load transfer path, so that the load can be more evenly distributed in the entire back wall structure, reduce local stress concentration, reduce the risk of structural damage, and enhance the overall compressive performance of the back wall. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the top plate structure of the back wall structure for pipe jacking starting provided in one embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the middle plate structure of the back wall structure for pipe jacking starting provided in one embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the cross-sectional structure of AA in section 2;

[0041] Figure 4 This is a schematic diagram of the reinforcement of the back wall structure for pipe jacking starting provided in one embodiment of this application;

[0042] Figure 5 This is a schematic diagram of the reinforcement of the back wall of the back wall structure for pipe jacking in one embodiment of this application.

[0043] Figure label:

[0044] 1. Launching shaft; 2. Inner wall; 3. Back wall; 4. Central longitudinal beam; 5. Support beam; 6. Reinforced concealed column; 7. Steel backing; 8. Temporary steel platform;

[0045] 11. Entrance / Exit; 31. First Support Section; 32. Second Support Section; 41. Armpit Area;

[0046] 311. First vertical reinforcement; 312. Second vertical reinforcement; 313. First horizontal reinforcement; 314. Second horizontal reinforcement; 321. First reinforcing reinforcement; 322. Second reinforcing reinforcement; 323. First supporting reinforcement; 324. Second supporting reinforcement; 325. Third supporting reinforcement. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0048] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0049] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0050] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 5 illustrate.

[0051] This embodiment provides a structure for starting pipe jacking in a subway station, which is applied in the field of pipe jacking construction technology. Specifically, as shown in the example... Figures 1 to 5As shown, the structure includes a launching shaft 1, an inner wall 2, and a back wall 3. The launching shaft 1 is located inside the subway station, primarily on the first basement level. This fully utilizes the space on the first basement level of the station for pipe jacking, avoiding the need for a new launching shaft 1 outside the station, thus reducing project investment and shortening the construction period, and minimizing impact from the surrounding environment. The inner wall 2 is a concrete wall within the station and is located on the side wall of the launching shaft 1. There are at least two back walls 3, with the inner wall 2 positioned between two back walls 3. The back walls 3 are at least partially connected to the inner walls 2 and extend at least partially away from the launching shaft 1. The back walls 3 provide necessary support, capable of withstanding soil pressure and other external loads generated during pipe jacking construction, ensuring the stability and safety of the pipe jacking. Furthermore, the combination of the back walls 3 and the inner walls 2 reduces concrete usage, meeting the requirements of green and low-carbon development in the construction industry.

[0052] Among them, the back wall 3 is a T-shaped structure. The back wall 3 is used to bear the reaction force of the back wall during the pipe jacking construction. The bending bearing capacity of the back wall can provide the driving force for the pipe jacking and overcome the unfavorable condition of no passive earth pressure in the station, so that the pipe jacking in the station can be started. The existence of the back wall 3 can also prevent the collapse of the soil, protect the construction area, enhance the bearing capacity of the back wall 3, and reduce the risk of collapse.

[0053] Specifically, such as Figures 1 to 5 As shown, the back wall 3 includes a first support part 31 and a second support part 32. The first support part 31 is connected to the second support part 32, and both the first support part 31 and the second support part 32 are at least partially connected to the inner wall 2. Both the first support part 31 and the second support part 32 extend to the horizontal direction of the subway station floor slab and connect with the subway station floor slab, providing additional support and effectively enhancing the overall stability of the back wall 3. The first support part 31 and the second support part 32 can expand the contact range with the pipe jacking construction, making the force transmission more uniform. By setting the first support part 31 and the second support part 32, the reaction force during pipe jacking can be well transmitted to the wall or floor slab of the subway station's basement level, effectively bearing the load generated during pipe jacking construction, reducing the deformation and displacement of the back wall 3, and ensuring construction safety. The side of the first support 31 facing the starting well 1 is on the same plane as the inner wall 2. In the horizontal direction, the width of the first support 31 is L1 and the width of the second support 32 is L2, where L1 < L2. The length of the first support 31 is L3 and the length of the second support 32 is L4, where L3 > L4. The longer design of the first support 31 can effectively transfer the load to the back wall 3 and the inner wall 2, enhancing the load-bearing capacity of the overall structure.

[0054] The cross-sectional dimensions of the first support part 31 and the second support part 32 need to be designed based on the structural stress calculation. In this embodiment, the cross-sectional dimensions of the first support part 31, L1, can be 0.7m and L3 can be 2m; the cross-sectional dimensions of the second support part 32, L2, can be 2.25m and L4 can be 1m.

[0055] Furthermore, such as Figures 1 to 3 As shown, it also includes a central longitudinal beam 4. The bottom of the central longitudinal beam 4 is at least partially connected to the inner wall 2 and at least partially connected to the back wall 3. The central longitudinal beam 4 is arranged parallel to the inner wall 2 and spans across the top of the back wall 3, connecting to it. The side of the central longitudinal beam 4 facing the starting manhole 1 is parallel to the inner wall 2. The central longitudinal beam 4 is constructed by interlacing multiple steel bars and then pouring concrete. The central longitudinal beam 4 has a haunch area 41, which is located in the middle of the central longitudinal beam 4. The haunch area 41 is made of reinforced concrete and is used to enhance the load-bearing capacity and stability of the central longitudinal beam 4. The reaction force during the jacking process is applied to the station roof and middle slabs through the back wall 3. The back wall 3 disperses the reaction force to the station roof and middle slabs, which helps to distribute the load evenly, reduce local stress concentration, thereby reducing the risk of damage to the back wall 3, effectively enhancing the stability of the starting shaft 1, and preventing the back wall 3 from deforming or collapsing due to the reaction force generated during the jacking process.

[0056] Furthermore, such as Figure 3 As shown, it also includes a steel backrest 7, which is at least partially connected to the back wall 3. The steel backrest 7 is used to bear the backrest reaction force during pipe jacking construction. During pipe jacking construction, the backrest reaction force will be transmitted through these connections, and the reaction force will be evenly distributed to the back wall 3 and the inner wall 2 to avoid local stress concentration, reduce structural deformation and displacement, and ensure construction safety.

[0057] Furthermore, such as Figure 2 As shown, the starting shaft 1 is equipped with an inlet / outlet 11 for jacking pipe drilling. The inlet / outlet 11 is located on the opposite side of the back wall 3, that is, the inlet / outlet 11 is set opposite to the back wall 3. The inlet / outlet 11 is correspondingly set with the first support part 31. The diameter of the inlet / outlet 11 is larger than the diameter of the jacking pipe to ensure that the jacking pipe can be drilled smoothly. Support beams 5 are provided on both sides of the inlet / outlet 11. The support beams 5 are set as post-cast ring beams and are connected to the sidewall of the starting shaft 1, providing additional support and effectively enhancing the strength and stability of the inlet / outlet 11. This strengthens the strength of the inlet / outlet 11 of the starting shaft 1 and prevents the inlet / outlet 11 from deforming or collapsing due to load during pipe jacking construction. A reinforcing hidden column 6 is provided on the side of the support beam 5 away from the inlet / outlet 11. The support beam 5 is connected to the reinforcing hidden column 6. The reinforcing hidden column 6 helps to distribute the load applied to the inlet / outlet 11, reduce local stress concentration, enhance the strength and stability of the inlet / outlet 11, and improve construction efficiency.

[0058] Furthermore, such as Figure 4 As shown, the first support 31 includes multiple first vertical ribs 311 and second vertical ribs 312. Both the first vertical ribs 311 and the second vertical ribs 312 are made of HRB400 steel bars. The first vertical ribs 311 are arranged on both sides of the first support 31 corresponding to the entrance 11 of the launching well 1, and the second vertical ribs 312 are arranged on the other two sides of the first support 31. The first vertical ribs 311 and the second vertical ribs 312 are on different sides. In this embodiment, the number of first vertical ribs 311 on each side can be 15, and the number of second vertical ribs 312 on each side can be 3 to enhance the stability of the back wall 3. Both the first vertical rib 311 and the second vertical rib 312 are arranged on the longitudinal extension line of the first support 31. With the ground as the horizontal plane as the reference plane, this means that the first vertical rib 311 and the second vertical rib 312 are perpendicular to the ground, forming a 90° angle with the ground. The first vertical rib 311 and the second vertical rib 312 can effectively resist vertical loads and ensure the stability of the back wall 3 during use. The spacing of the multiple first vertical ribs 311 is arranged according to the design requirements, and the spacing of the multiple second vertical ribs 312 is also arranged according to the design requirements. The first vertical ribs 311 and the second vertical ribs 312 have the same diameter. In this embodiment, HRB400 steel bars with a diameter of 28 mm can be selected. The first vertical ribs 311 and the second vertical ribs 312 form a rectangle, which can effectively transfer the load to the structure or foundation below, thereby enhancing the load-bearing capacity of the back wall 3.

[0059] Furthermore, such as Figure 4As shown, the second support portion 32 includes multiple first reinforcing ribs 321 and second reinforcing ribs 322. The second reinforcing ribs 322 are located on the side of the second support portion 32 away from the first support portion 31, while the first reinforcing ribs 321 are located on opposite sides of the second support portion 32. The first reinforcing ribs 321 and the second reinforcing ribs 322 are on different sides. The first reinforcing ribs 321 are arranged parallel to the first vertical ribs 311. Both the first reinforcing ribs 321 and the second reinforcing ribs 322 are located on the longitudinal extension line of the second support portion 32. With the ground as the horizontal plane as the reference plane, it is shown that the first reinforcing ribs 321 and the second reinforcing ribs 322 are perpendicular to the ground and form a 90° angle with the ground. The first reinforcing ribs 321 and the second reinforcing ribs 322 can effectively resist vertical loads and ensure the stability of the back wall 3 during use. The spacing of the multiple first reinforcing bars 321 is arranged according to the design requirements. The number of first reinforcing bars 321 can be 20, and the first reinforcing bars 321 are set in two rows, with 10 bars in each row. In this embodiment, the first reinforcing bars 321 can be HRB400 grade steel bars with a diameter of 32 mm. In this embodiment, the spacing between two adjacent second reinforcing bars 322 is 150 mm. In this embodiment, the number of second reinforcing bars 322 on each side can be 13. In this embodiment, the second reinforcing bars 322 can be HRB400 grade steel bars with a diameter of 22 mm and a spacing of 150 mm. The first reinforcing bars 321 and the second reinforcing bars 322 form a rectangle, which can effectively transfer the load to the structure or foundation below to enhance the bearing capacity of the back wall 3.

[0060] Furthermore, such as Figure 5As shown, the first support 31 also includes multiple first transverse reinforcement bars 313 and second transverse reinforcement bars 314. The first transverse reinforcement bars 313 and second transverse reinforcement bars 314 are configured as stirrups. The first transverse reinforcement bars 313 are at least partially connected with the first vertical reinforcement bars 311, and the second transverse reinforcement bars 314 are at least partially connected with the second vertical reinforcement bars 312 to provide support during the jacking of the pipe. The first transverse reinforcement bars 313 are sleeved on the first vertical reinforcement bars 311 and the second vertical reinforcement bars 312, and then fixed by binding. Finally, concrete is poured to fix and shape the structure. The first transverse reinforcement bars 313 and second transverse reinforcement bars 314 can improve the shear resistance of the structure. During the jacking of the pipe, the back wall 3 will... Under the influence of shear forces, the presence of the first transverse rib 313 and the second transverse rib 314 can effectively resist these shear forces and prevent the structure of the back wall 3 from being damaged. At the same time, the cooperation between the first transverse rib 313 and the first vertical rib 311, and the cooperation between the second transverse rib 314 and the second vertical rib 312, can optimize the load transfer path, so that the load can be more evenly distributed throughout the entire back wall 3 structure, reduce local stress concentration, reduce the risk of structural damage, enhance the overall compressive strength of the back wall 3, and ensure that the first support part 31 and the second support part 32 can effectively bear the load from the jacking pipe during the jacking process, and maintain the stability of the back wall 3 structure. With the ground as the horizontal plane as the reference plane, the first transverse reinforcement 313 and the second transverse reinforcement 314 are parallel to the ground. The first transverse reinforcement 313 and the second transverse reinforcement 314 can be HRB400 grade steel bars with a diameter of 20 and a spacing of 100. The second transverse reinforcement 314 is located at least partially in the inner wall 2, which can effectively distribute the load evenly to the walls or floors of the underground floor of the subway station, thereby improving the safety and stability of the launching shaft 1.

[0061] Furthermore, such as Figure 5As shown, the second support portion 32 also includes multiple first support ribs 323 and second support ribs 324. The first support ribs 323 and second support ribs 324 are configured as stirrups. The first support ribs 323 at least partially cooperate with the second vertical ribs 312 and at least partially cooperate with the first reinforcing ribs 321 to provide support during the jacking of the pipe. The second support ribs 324 at least partially connect with the second reinforcing ribs 322 and extend in a direction away from the first support portion 31. The first support ribs 323 at least partially sleeve the first vertical ribs 311, the first reinforcing ribs 321, and the second reinforcing ribs 322. The second support ribs 324 at least partially sleeve the third reinforcing ribs, and are then fixedly connected by binding. Finally, concrete is poured to fix and shape the structure. The first support rib 323 and the second support rib 324 can improve the shear resistance of the back wall 3. During the jacking process, the back wall 3 will be subjected to shear forces and influences. The presence of the first support rib 323 and the second support rib 324 can effectively resist these shear forces and prevent the structure of the back wall 3 from being damaged. At the same time, the cooperation between the first support rib 323 and the first vertical rib 311, and the cooperation between the second support rib 324 and the third reinforcing rib, can optimize the load transfer path, so that the load can be more evenly distributed in the entire back wall 3 structure, reduce local stress concentration, reduce the risk of structural damage, enhance the overall compressive performance of the back wall 3, and ensure that the first support part 31 and the second support part 32 can effectively bear the load from the jacking pipe during the jacking process, and maintain the stability of the back wall 3 structure. With the ground as the horizontal plane as the reference plane, the first support bar 323 and the second support bar 324 are set parallel to the ground. The first support bar 323 and the second support bar 324 can be selected as HRB400 grade steel bars with a diameter of 20 and a spacing of 100. Multiple first support bars 323 and second support bars 324 are set with a spacing of 100. The number of first support bars 323 and second support bars 324 is arranged according to the number required by the design.

[0062] Furthermore, such as Figure 5As shown, the second support part 32 also includes a plurality of third support ribs 325. The third support ribs 325 are configured as stirrups. The third support ribs 325 at least partially cooperate with the first reinforcing ribs 321 and at least partially cooperate with the second support ribs 324 to provide support during the jacking of the pipe. The third support ribs 325 are arranged parallel to the first transverse ribs 313. With the ground as the horizontal plane as the reference plane, the third support ribs 325 are arranged parallel to the ground. The third support ribs 325 can be selected with a diameter of 16 and a spacing of 1. The HRB400 grade steel bars are 00, and the third support bars 325 are arranged side by side. In this embodiment, at least 3 bars are set in each row. They are set on the side of the second support 32 away from the inner wall 2. The third support bars 325 can effectively provide the shear resistance of the back wall 3. The cooperation between the third support bars 325 and the second reinforcing bars 322 can optimize the load transfer path, so that the load can be more evenly distributed in the entire back wall 3 structure, reduce local stress concentration, reduce the risk of structural damage, and enhance the overall compressive performance of the back wall 3.

[0063] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A back wall structure for pipe jacking starting, characterized in that, include: Launching shaft (1), which is located inside the subway station; Inner wall (2), the inner wall (2) is set on the side wall of the starting well (1); The back wall (3) is at least partially connected to the inner wall (2) and extends at least partially toward the direction away from the starting well (1); The back wall (3) is a T-shaped structure and is used to bear the reaction force of the pipe jacking construction.

2. The back wall structure for pipe jacking starting as described in claim 1, characterized in that, The back wall (3) includes a first support part (31) and a second support part (32), the first support part (31) and the second support part (32) are connected, and the first support part (31) and the second support part (32) are at least partially connected to the inner wall (2); Both the first support section (31) and the second support section (32) extend to the horizontal direction of the subway station floor slab and are connected to the subway station floor slab.

3. The back wall structure for pipe jacking starting as described in claim 1, characterized in that, It also includes a central longitudinal beam (4), the bottom of which is at least partially connected to the inner wall (2) and at least partially connected to the back wall (3), and the central longitudinal beam (4) is arranged parallel to the inner wall (2); Among them, the central longitudinal beam (4) is provided with a haunch area (41), and the reaction force of the jacking pipe during jacking is applied to the station roof and middle plate through the back wall (3).

4. The back wall structure for pipe jacking starting as described in claim 1, characterized in that, It also includes a steel backrest (7), which is at least partially connected to the back wall (3) and is used to bear the backrest reaction force during pipe jacking construction.

5. The back wall structure for pipe jacking starting as described in claim 2, characterized in that, The starting well (1) is provided with an inlet (11) for jacking pipe drilling. The inlet (11) is located on the side opposite to the back wall (3). The inlet (11) is provided in correspondence with the first support part (31). The entrance (11) is provided with support beams (5) on both sides. The support beams (5) are connected to the side wall of the launching well (1) to strengthen the strength of the entrance (11) of the launching well (1).

6. The back wall structure for pipe jacking starting as described in claim 5, characterized in that, The first support part (31) includes multiple first vertical ribs (311) and second vertical ribs (312). The first vertical ribs (311) are arranged on both sides of the first support part (31) corresponding to the inlet (11) of the starting well (1), and the second vertical ribs (312) are arranged on the other two sides of the first support part (31). The first vertical rib (311) and the second vertical rib (312) are both located on the longitudinal extension line of the first support part (31).

7. The back wall structure for pipe jacking starting as described in claim 6, characterized in that, The second support part (32) includes multiple first reinforcing ribs (321) and second reinforcing ribs (322). The second reinforcing ribs (322) are disposed on the side of the second support part (32) away from the first support part (31). The first reinforcing ribs (321) are disposed on opposite sides of the second support part (32). The first reinforcing ribs (321) are disposed parallel to the first vertical ribs (311). The first reinforcing rib (321) and the second reinforcing rib (322) are both arranged on the longitudinal extension line of the second support part (32).

8. The back wall structure for pipe jacking starting as described in claim 7, characterized in that, The first support part (31) also includes a plurality of first transverse ribs (313) and second transverse ribs (314). The first transverse ribs (313) cooperate with the first vertical ribs (311) at least in part, and the second transverse ribs (314) cooperate with the second vertical ribs (312) at least in part, so as to achieve support for the jacking of the pipe. The second transverse reinforcement (314) is located at least partially in the inner wall (2).

9. The back wall structure for pipe jacking starting as described in claim 8, characterized in that, The second support part (32) also includes a plurality of first support ribs (323) and second support ribs (324). The first support ribs (323) cooperate at least partially with the second vertical ribs (312) and at least partially with the first reinforcing ribs (321) to provide support for the jacking of the pipe. The second support rib (324) is at least partially connected to the second reinforcing rib (322) and extends at least partially in a direction away from the first support portion (31).

10. The back wall structure for pipe jacking starting as described in claim 9, characterized in that, The second support part (32) also includes a plurality of third support ribs (325), which at least partially cooperate with the first reinforcing rib (321) and at least partially cooperate with the second support rib (324) to provide support for the jacking of the pipe.

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