Structure for launching jacking pipe in subway station and construction method

Abstract

The structure for launching the jacking pipe in the subway station comprises a launching well, an inner partition wall and a back wall, and the launching well is located in the subway station; the inner partition wall is arranged on the side wall of the launching well; the back wall is at least partially connected with the inner partition 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. The invention further discloses a construction method for pipe jacking starting in the subway station. The construction method comprises the steps that S1, the enclosure structure is constructed on the first negative layer of the station body; s2, when the main structure of the station is constructed, a starting well opening is reserved, a back wall and an inner partition wall are arranged in the starting well, and construction is conducted in the same period; s3, an auxiliary pipe jacking receiving well is constructed; and S4, after pipe jacking starting and receiving are completed, hole sealing treatment is conducted on the station main body structure, and after pipe jacking construction is completed, a back wall and a haunching area are chiseled away. The bearing capacity of the back wall can be enhanced.

Description

Technical Field

[0001] This application relates to the technical field of pipe jacking construction, and particularly to a structure and construction method for pipe jacking starting within a subway station. Background Art

[0002] The pipe jacking construction process is widely applied in current underground municipal structures and is particularly common in the ancillary projects of subway stations, usually to avoid the impacts brought by open-cut construction to surrounding buildings, important pipelines, and main traffic.

[0003] Common subway pipe jacking construction generally starts in the ancillary structure. For some special underground structures, it is difficult to start pipe jacking in the ancillary structure. However, adding a pipe jacking starting shaft outside the station will correspondingly increase project investment, extend the construction period, and at the same time have high requirements for the surrounding environment and space during construction.

[0004] In the prior art, the back wall is vertically arranged and is usually only connected to the side wall of the starting shaft. During the pipe jacking construction process, when the thrust applied by the pipe jacking is too large, the back wall may receive too large a reaction force. In this case, the structural stability of the back wall is easily affected, and it is easy to cause the back wall to deform or collapse. The generated deformation will not only affect the bearing capacity of the back wall but also easily cause serious damage to the overall structure of the starting shaft, and even trigger the collapse of the soil body, affecting construction safety.

[0005] Therefore, there is room for further improvement in the structure of pipe jacking starting in the prior art. Summary of the Invention

[0006] The purpose of this application is to provide a structure and construction method for pipe jacking starting within a subway station to solve the technical problems raised in the background art, such as the difficulty of pipe jacking starting in subway stations, the excessive reaction force during pipe jacking, which easily leads to a decline in the structural stability of the back wall, and the risk of collapse.

[0007] To achieve the above purpose, this application provides a structure for pipe jacking starting within a subway station, including:

[0008] A starting shaft, which is located within the subway station;

[0009] An internal partition wall, which is arranged on the side wall of the starting shaft;

[0010] A back wall, at least part of which is connected to the internal partition wall and at least part of which extends in a direction away from the starting shaft;

[0011] Among them, the back wall is a T-shaped structure and is used to bear the reaction force of the backrest during pipe jacking construction;

[0012] The rear wall includes a first support portion and a second support portion. The first support portion is connected to the second support portion, and both the first support portion and the second support portion extend to the horizontal direction of the subway station floor slab and are connected to the subway station floor slab.

[0013] Compared with the prior art, the launching shaft is located inside the subway station, making full use of the main space of the station for pipe jacking launching, which can avoid adding a new pipe jacking launching shaft outside the station, reduce project investment and shorten the construction period, and is less affected by the surrounding environment. The structure for pipe jacking launching inside the subway station in this application is to set a T-shaped rear wall. The anti-bending bearing capacity of the rear wall can provide driving force for the pipe jacking, overcome the unfavorable condition of no passive earth pressure inside the station, and enable the pipe jacking launching inside the station to have the implementation conditions. The existence of the rear wall can also prevent the collapse of the soil body, protect the construction area, enhance the bearing capacity of the rear wall, and reduce the risk of collapse and deformation. By setting the first support portion and the second support portion, the reaction force during pipe jacking can be well transmitted to the wall of the first basement floor of the subway station, effectively bearing the load generated during the pipe jacking construction process, reducing the deformation and displacement of the rear wall, and ensuring construction safety.

[0014] Preferably, it further includes a middle longitudinal beam. At least part of the bottom of the middle longitudinal beam is connected to the inner partition wall and at least part is connected to the rear wall. The middle longitudinal beam is arranged parallel to the inner partition wall;

[0015] Wherein, the middle longitudinal beam is provided with a haunch area, and the reaction force during pipe jacking acts on the station roof slab and the middle slab through the rear wall.

[0016] In this embodiment, the reaction force during pipe jacking acts on the inner partition wall and the middle longitudinal beam through the rear wall. The rear wall disperses the reaction force to the station roof slab and the middle slab, which helps to evenly distribute the load, reduce local stress concentration, thereby reducing the risk of damage to the rear wall, effectively enhancing the stability of the launching shaft, and can also prevent the rear wall from deforming or collapsing due to the reaction force generated during the pipe jacking process.

[0017] Preferably, it further includes a steel backrest. At least part of the steel backrest is connected to the rear wall, and the steel backrest is used to bear the reaction force of the backrest during pipe jacking construction.

[0018] In this embodiment, during the pipe jacking construction process, the reaction force of the backrest during pipe jacking construction will be transmitted through these connections, evenly dispersing the reaction force to the rear wall and the inner partition wall, avoiding local stress concentration, reducing the deformation and displacement of the structure, and ensuring construction safety.

[0019] Preferably, the launching shaft is provided with an entrance and exit for the pipe jacking to drill in, and the entrance and exit is located on the side opposite to the rear wall;

[0020] 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 shaft to strengthen the strength of the entrance and exit of the launching shaft.

[0021] 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 launching shaft, which can provide additional support to strengthen the strength of the entrance and exit of the launching shaft and prevent the entrance and exit from deforming or collapsing due to loads during the pipe jacking construction process.

[0022] Preferably, the first support portion includes a plurality of first vertical ribs and second vertical ribs. The first vertical ribs are provided on the two sides of the first support portion corresponding to the entrance and exit of the launching shaft, and the second vertical ribs are provided on the other two sides of the first support portion.

[0023] Both the first vertical ribs and the second vertical ribs are provided on the longitudinal extension line of the first support portion.

[0024] In this embodiment, both the first vertical ribs and the second vertical ribs are provided on the longitudinal extension line of the first support portion. Taking the ground as a horizontal reference plane, it means that the first vertical ribs and the second vertical ribs are perpendicular to the ground and form an angle of 90° with the ground. The first vertical ribs and the second vertical ribs can effectively resist vertical loads and ensure the stability of the back wall during use.

[0025] Preferably, the second support portion includes a plurality of first reinforcing ribs and second reinforcing ribs. The second reinforcing ribs are provided on the side of the second support portion away from the first support portion, and the first reinforcing ribs are provided on the opposite two sides of the second support portion. The first reinforcing ribs are arranged in parallel with the first vertical ribs.

[0026] Both the first reinforcing ribs and the second reinforcing ribs are provided on the longitudinal extension line of the second support portion.

[0027] In this embodiment, both the first reinforcing ribs and the second reinforcing ribs are provided on the longitudinal extension line of the second support portion. Taking the ground as a horizontal reference plane, it means that the first reinforcing ribs and the second reinforcing ribs are perpendicular to the ground and form an angle of 90° with the ground. The first reinforcing ribs and the second reinforcing ribs can effectively resist vertical loads and ensure the stability of the back wall during use.

[0028] Preferably, the first support portion further includes a plurality of first transverse ribs and second transverse ribs. At least part of the first transverse ribs cooperate with the first vertical ribs, and at least part of the second transverse ribs cooperate with the second vertical ribs to achieve support during pipe jacking.

[0029] Wherein, at least part of the second transverse ribs are located in the internal partition wall.

[0030] In this embodiment, during the jacking of the pipe jacking, the back wall will be subjected to shear forces and influences. The presence of the first transverse reinforcement and the second transverse reinforcement can effectively resist these shear forces, prevent the structure of the back wall from being damaged. At the same time, the cooperation between the first transverse reinforcement and the first vertical reinforcement, and the cooperation between the second transverse reinforcement and the second vertical reinforcement can optimize the load transfer path, so that the load can be more evenly distributed to the entire back wall structure, reduce local stress concentration, reduce the risk of structural damage, enhance the overall compressive performance of the back wall, and ensure that during the pipe jacking process, the first support part and the second support part can effectively bear the load from the pipe jacking and maintain the stability of the back wall structure.

[0031] Preferably, the second support part further includes a plurality of first support bars and second support bars. At least part of the first support bar cooperates with the second vertical reinforcement and at least part of it cooperates with the first reinforcement bar to achieve the support during the pipe jacking.

[0032] At least part of the second support bar is connected to the second reinforcement bar and at least part of it extends in a direction away from the first support part.

[0033] In this embodiment, the first support bar and the second support bar can improve the shear resistance of the back wall. During the pipe jacking process, the back wall will be subjected to shear forces and influences. The presence of the first support bar and the second support bar can effectively resist these shear forces and prevent the structure of the back wall from being damaged.

[0034] Preferably, the second support part further includes a plurality of third support bars. At least part of the third support bar cooperates with the first reinforcement bar and at least part of it cooperates with the second support bar to achieve the support during the pipe jacking.

[0035] In this embodiment, the third support bar can effectively provide the shear resistance of the back wall. The cooperation between the third support bar and the second reinforcement bar can optimize the load transfer path, so that the load can be more evenly distributed to 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.

[0036] This application also provides a construction method for pipe jacking starting in a subway station, including the following steps:

[0037] Step S1: Construct the retaining structure for the first basement floor of the station main body.

[0038] Step S2: When constructing the station main body structure, reserve an opening for the starting shaft, set a back wall and an internal partition wall in the starting shaft, and construct them synchronously.

[0039] Step S3: Construct the auxiliary pipe jacking receiving well.

[0040] Step S4: After the pipe jacking starts and is received, seal the holes of the main structure of the station. After the pipe jacking construction is completed, chisel off the back wall and the haunch area;

[0041] Among them, in step S4, it specifically further includes:

[0042] Step S41: Chisel off the second support part of the back wall, retain the first support part, and retain the inner partition wall and the middle longitudinal beam;

[0043] Or,

[0044] According to the building function requirements, determine the scope of the back wall to be chiseled off, and retain or chisel off the back wall as a whole.

[0045] Compared with the prior art, in the construction method for pipe jacking starting inside a subway station provided in the embodiment of the present application, when constructing the main structure of the station, the back wall and the inner partition wall are set simultaneously, which can better form a connected whole with the top plate and the middle plate of the station structure, thereby improving the bearing capacity of bearing the back force after the pipe jacking starts, helping to improve the construction efficiency and reduce the construction period. After the pipe jacking starts and is received, sealing the holes of the main structure can effectively prevent the influence on the structure during the construction process and ensure the stability of the structure. Among them, when chiseling off the back wall, flexibly selecting to retain or chisel off as a whole according to the building function requirements can better adapt to the actual situation and design requirements. Brief Description of the Drawings

[0046] Figure 1 is a schematic top plate structure diagram of the structure and construction method for pipe jacking starting inside a subway station provided in an embodiment of the present application;

[0047] Figure 2 is a schematic middle plate structure diagram of the structure and construction method for pipe jacking starting inside a subway station provided in an embodiment of the present application;

[0048] Figure 3 is a sectional structure diagram of A - A in 2;

[0049] Figure 4 is a schematic back wall reinforcement diagram of the structure and construction method for pipe jacking starting inside a subway station provided in an embodiment of the present application;

[0050] Figure 5 is a schematic back wall reinforcement diagram of the structure and construction method for pipe jacking starting inside a subway station provided in an embodiment of the present application.

[0051] Reference Signs:

[0052] 1, starting shaft; 2, inner partition wall; 3, back wall; 4, middle longitudinal beam; 5, support beam; 6, strengthened concealed column; 7, steel backrest; 8, temporary steel platform;

[0053] 11. Entrance and exit; 31. First support part; 32. Second support part; 41. Haunch area;

[0054] 311. First vertical reinforcement; 312. Second vertical reinforcement; 313. First horizontal reinforcement; 314. Second horizontal reinforcement; 321. First strengthening reinforcement; 322. Second strengthening reinforcement; 323. First support reinforcement; 324. Second support reinforcement; 325. Third support reinforcement. Detailed implementation manner

[0055] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the following provides a detailed, clear, and complete description of the present disclosure in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0056] In the description of the present application, if the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0057] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present application.

[0058] The following further describes the present application in detail with reference to the accompanying drawings. See, for example, Figures 1 to 5 Description.

[0059] A structure and construction method for pipe jacking starting inside a subway station provided in this embodiment are applied in the technical field of pipe jacking construction. As shown in Figures 1 to 5 This embodiment provides a structure for pipe jacking starting inside a subway station, which is applied in the technical field of pipe jacking construction. Specifically, as shown in Figures 1 to 5As shown in the figure, it includes a launching shaft 1, an internal partition wall 2 and a back wall 3. The launching shaft 1 is located inside the subway station, mainly on the first basement floor of the subway station. By making full use of the space on the first basement floor of the main body of the station for pipe jacking launching, it avoids adding a new pipe jacking launching shaft 1 outside the station, reduces project investment and shortens the construction period, and is less affected by the surrounding environment. The internal partition wall 2 is arranged on the side wall of the launching shaft 1. The internal partition wall 2 is a concrete wall. There are at least two back walls 3. The internal partition wall 2 is arranged between the two back walls 3. At least part of the back wall 3 is connected to the internal partition wall 2. At least part of the back wall 3 extends in a direction away from the launching shaft 1. The back wall 3 can provide necessary support, can bear the soil pressure and other external loads generated during the pipe jacking construction process, ensure the stability and safety of the pipe jacking, and the combination of the back wall 3 and the internal partition wall 2 can reduce the concrete consumption, meeting the development requirements of green and low-carbon in the construction industry.

[0060] Among them, the back wall 3 is a T-shaped structure. The back wall 3 is used to bear the reaction force of the backrest during pipe jacking construction. The flexural bearing capacity of the back wall can provide driving force for the pipe jacking and overcome the unfavorable condition of no passive earth pressure inside the station, enabling the pipe jacking launching inside the station to have the implementation conditions. The existence of the back wall 3 can also prevent the collapse of the soil body, protect the construction area, enhance the bearing capacity of the back wall 3, and reduce the risk of collapse.

[0061] Specifically, as Figures 1 to 5 shown in the figure, 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. Both the first support part 31 and the second support part 32 extend to the horizontal direction of the subway station floor slab and are connected to the subway station floor slab, which can provide additional support and effectively enhance the overall stability of the back wall 3. The first support part 31 and the second support part 32 can expand the contact range during 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 first basement floor of the subway station, effectively bearing the load generated during the pipe jacking construction process, reducing the deformation and displacement of the back wall 3, and ensuring construction safety. One side of the first support part 31 facing the launching shaft 1 is in the same plane as the internal partition wall 2. In the horizontal direction, the width of the first support part 31 is L1, and the width of the second support part 32 is L2, where L1 < L2. The length of the first support part 31 is L3, and the length of the second support part 32 is L4, L3 > L4. The longer design of the first support part 31 can effectively transmit the load to the back wall 3 and the internal partition wall 2, enhancing the bearing capacity of the overall structure.

[0062] Among them, the cross-sectional dimensions of the first support part 31 and the second support part 32 need to be designed according to the structural stress calculation. In this embodiment, the cross-sectional dimension L1 of the first support part 31 can be taken as 0.7 m, and L3 can be taken as 2 m; the cross-sectional dimension L2 of the second support part 32 can be taken as 2.25 m, and L4 can be taken as 1 m.

[0063] Furthermore, as Figures 1 to 3 shown, it further includes a middle longitudinal beam 4. At least part of the bottom of the middle longitudinal beam 4 is connected to the inner partition wall 2 and at least part is connected to the back wall 3. The middle longitudinal beam 4 is arranged parallel to the inner partition wall 2. The middle longitudinal beam 4 straddles the top of the back wall 3 and is connected to the back wall 3. The side of the middle longitudinal beam 4 facing the launching shaft 1 is parallel to the inner partition wall 2. The middle longitudinal beam 4 is made by arranging multiple steel bars in a staggered manner and then pouring concrete. The middle longitudinal beam 4 is provided with a haunch area 41. The haunch area 41 is arranged at the middle position of the middle longitudinal beam 4. The haunch area 41 adopts a reinforced concrete structure. The haunch area 41 is used to enhance the bearing capacity and stability of the middle longitudinal beam 4. Among them, the reaction force during the jacking of the pipe jacking acts on the station roof slab and the middle slab through the back wall 3. The back wall 3 distributes the reaction force to the station roof slab and the middle slab, which helps to evenly distribute the load and reduce local stress concentration, thereby reducing the risk of damage to the back wall 3 and effectively enhancing the stability of the launching shaft 1. It can also prevent the back wall 3 from deforming or collapsing due to the reaction force generated during the pipe jacking process.

[0064] Furthermore, as Figure 3 shown, it further includes a steel backrest 7. At least part of the steel backrest 7 is connected to the back wall 3. The steel backrest 7 is used to bear the back reaction force during the pipe jacking construction. During the pipe jacking construction process, the back reaction force will be transmitted through these connections, evenly dispersing the reaction force to the back wall 3 and the inner partition wall 2, avoiding local stress concentration, reducing the deformation and displacement of the structure, and ensuring the construction safety.

[0065] Furthermore, as Figure 2 shown, the launching shaft 1 is provided with an entrance / exit 11 for the pipe jacking to drill into. The entrance / exit 11 is located on the side opposite to the back wall 3, that is, the entrance / exit 11 is arranged opposite to the back wall 3. The aperture of the entrance / exit 11 is larger than the diameter of the pipe jacking to ensure that the pipe jacking can smoothly drill in. Among them, support beams 5 are arranged on both sides of the entrance / exit 11. The support beams 5 are set as post-cast ring beams. The support beams 5 are connected to the side wall of the launching shaft 1, which can provide additional support, effectively enhancing the strength and stability of the entrance / exit 11, and is used to strengthen the strength of the entrance / exit 11 of the launching shaft 1 to prevent the entrance / exit 11 from deforming or collapsing due to the load during the pipe jacking construction process. On the side of the support beam 5 far from the entrance / exit 11, there are strengthening concealed columns 6. The support beam 5 is connected to the strengthening concealed columns 6. The strengthening concealed columns 6 can help to disperse the load applied to the entrance / exit 11, reduce local stress concentration, enhance the strength and stability of the entrance / exit 11, and improve the construction efficiency.

[0066] Further, as Figure 4 shown, the first support portion 31 includes a plurality of first vertical bars 311 and second vertical bars 312. Both the first vertical bars 311 and the second vertical bars 312 are made of HRB400 steel bars. The first vertical bars 311 are arranged on both sides of the first support portion 31 corresponding to the entrance 11 of the launching shaft 1, and the second vertical bars 312 are arranged on the other two sides of the first support portion 31. The first vertical bars 311 and the second vertical bars 312 are on different sides. In this embodiment, the number of the first vertical bars 311 on each side can be 15, and the number of the second vertical bars 312 on each side can be 3 to enhance the stability of the back wall 3. Both the first vertical bars 311 and the second vertical bars 312 are arranged on the longitudinal extension line of the first support portion 31. Taking the ground as the horizontal reference plane, it means that the first vertical bars 311 and the second vertical bars 312 are perpendicular to the ground and form an angle of 90° with the ground. The first vertical bars 311 and the second vertical bars 312 can effectively resist the vertical load and ensure the stability of the back wall 3 during use. The spacing of the plurality of first vertical bars 311 is arranged according to the design requirements, and the spacing of the plurality of second vertical bars 312 is also arranged according to the design requirements. The diameters of the first vertical bars 311 and the second vertical bars 312 are the same. In this embodiment, HRB400 steel bars with a diameter of 28 can be selected. The first vertical bars 311 and the second vertical bars 312 enclose a rectangle, which can effectively transfer the load to the underlying structure or foundation to enhance the bearing capacity of the back wall 3.

[0067] Further, as Figure 4As shown in the figure, the second support part 32 includes multiple first reinforcing ribs 321 and second reinforcing ribs 322. The second reinforcing ribs 322 are arranged on the side of the second support part 32 away from the first support part 31. The first reinforcing ribs 321 are arranged on the opposite two sides of the second support part 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 rib 311. Both the first reinforcing ribs 321 and the second reinforcing ribs 322 are arranged on the longitudinal extension line of the second support part 32. Taking the ground as the horizontal reference plane, it means that the first reinforcing ribs 321 and the second reinforcing ribs 322 are perpendicular to the ground and form an angle of 90° with the ground. The first reinforcing ribs 321 and the second reinforcing ribs 322 can effectively resist the vertical load and ensure the stability of the back wall 3 during use. The spacing between the multiple first reinforcing ribs 321 is arranged according to the design requirements. The number of the first reinforcing ribs 321 can be 20. The first reinforcing ribs 321 are arranged in two rows, with 10 corresponding to each row. The first reinforcing ribs 321 in this embodiment can be selected as HRB400 grade steel bars with a diameter of 32; in this embodiment, the spacing between two adjacent second reinforcing ribs 322 is 150 mm. The number of the second reinforcing ribs 322 on each side in this embodiment can be selected as 13. The second reinforcing ribs 322 in this embodiment can be selected as HRB400 grade steel bars with a diameter of 22 and a spacing of 150 mm. The first reinforcing ribs 321 and the second reinforcing ribs 322 enclose a rectangle, which can effectively transfer the load to the underlying structure or foundation to enhance the bearing capacity of the back wall 3.

[0068] Further, as Figure 5As shown, the first support portion 31 further includes a plurality of first transverse ribs 313 and second transverse ribs 314. The first transverse ribs 313 and the second transverse ribs 314 are configured as stirrups. At least part of the first transverse ribs 313 cooperate with the first vertical ribs 311, and at least part of the second transverse ribs 314 cooperate with the second vertical ribs 312 to achieve support during the jacking of the jacking pipe. The first transverse ribs 313 are sleeved on the first vertical ribs 311 and the second vertical ribs 312, and then fixedly connected by binding. Finally, concrete is poured for fixed molding. The first transverse ribs 313 and the second transverse ribs 314 can improve the shear resistance of the structure. During the jacking of the jacking pipe, the back wall 3 will be subjected to shear forces and influences. The presence of the first transverse ribs 313 and the second transverse ribs 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 ribs 313 and the first vertical ribs 311, and the cooperation between the second transverse ribs 314 and the second vertical ribs 312 can optimize the load transfer path, so that the load can be more evenly distributed to 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 to ensure that during the jacking of the jacking pipe, the first support portion 31 and the second support portion 32 effectively bear the load from the jacking pipe and maintain the stability of the back wall 3 structure. Among them, with the ground as the horizontal reference plane, the first transverse ribs 313 and the second transverse ribs 314 are parallel to the ground. The first transverse ribs 313 and the second transverse ribs 314 can be HRB400 grade steel bars with a diameter of 20 and a spacing of 100. At least part of the second transverse ribs 314 is located in the inner partition wall 2, which can effectively distribute the load evenly to the walls or floors of the first basement floor of the subway station, improving the safety and stability of the launch shaft 1.

[0069] Further, as Figure 5As shown, the second support portion 32 further includes a plurality of first support ribs 323 and second support ribs 324. The first support ribs 323 and second support ribs 324 are arranged as stirrups. At least a part of the first support rib 323 cooperates with the second vertical rib 312, and at least a part of the first support rib 323 cooperates with the first reinforcing rib 321 to achieve the support during the jacking of the jacking pipe. At least a part of the second support rib 324 is connected to the second reinforcing rib 322, and the second support rib 324 extends in a direction away from the first support portion 31. At least a part of the first support rib 323 is sleeved on the first vertical rib 311, the first reinforcing rib 321 and the second reinforcing rib 322, and at least a part of the second support rib 324 is sleeved on the third reinforcing rib, and then fixed and connected by binding. Finally, concrete is poured for fixed molding. The first support rib 323 and the second support rib 324 can improve the shear resistance of the back wall 3. During the jacking of the jacking pipe, 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 to the entire back wall 3 structure, reduce local stress concentration, and reduce the risk of structural damage, enhancing the overall compressive performance of the back wall 3 and ensuring that during the jacking of the jacking pipe, the first support portion 31 and the second support portion 32 can effectively bear the load from the jacking pipe and maintain the stability of the back wall 3 structure. Among them, with the ground as the horizontal reference plane, the first support rib 323 and the second support rib 324 are arranged parallel to the ground. The first support rib 323 and the second support rib 324 can be HRB400 grade steel bars with a diameter of 20 and a spacing of 100. A plurality of first support ribs 323 and second support ribs 324 are arranged at a spacing of 100, and the number of the first support rib 323 and the second support rib 324 is arranged according to the number required by the design.

[0070] Further, as Figure 5As shown, the second support part 32 further includes a plurality of third support ribs 325. The third support ribs 325 are configured as stirrups. At least part of the third support ribs 325 cooperate with the first reinforcing ribs 321, and at least part of the third support ribs 325 cooperate with the second support ribs 324 to achieve the support during the jacking of the jacking pipe. Among them, the third support ribs 325 are arranged parallel to the first transverse rib 313. Taking the ground as the horizontal reference plane, the third support ribs 325 are arranged parallel to the ground. The third support ribs 325 can be selected as HRB400 grade steel bars with a diameter of 16 and a spacing of 100. The third support ribs 325 are arranged side by side. In this embodiment, at least 3 are arranged in each row, and they are arranged on the side of the second support part 32 away from the inner partition wall 2. The third support ribs 325 can effectively provide the shear resistance of the back wall 3. The cooperation between the third support ribs 325 and the second reinforcing ribs 322 can optimize the load transfer path, so that the load can be more evenly distributed to 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.

[0071] This embodiment also provides a construction method for the jacking pipe starting in the subway station, including the following steps:

[0072] Step S1: Construct the retaining structure for the first basement floor of the station main body;

[0073] Step S2: When constructing the station main body structure, reserve the opening of the starting shaft 1, and set the back wall 3 and the inner partition wall 2 in the starting shaft 1 and construct them synchronously;

[0074] Step S3: Construct the auxiliary jacking pipe receiving well;

[0075] Step S4: After the jacking pipe starts and is received, perform hole sealing treatment on the station main body structure. After the jacking pipe construction is completed, chisel off the back wall 3 and the haunch area 41;

[0076] Among them, in step S4, it specifically further includes:

[0077] Step S41: Chisel off the second support part 32 of the back wall 3, retain the first support part 31, and retain the inner partition wall 2 and the middle longitudinal beam 4;

[0078] Or,

[0079] According to the building function requirements, determine the scope of chiseling off the back wall 3, and retain or chisel off the back wall 3 as a whole.

[0080] In this embodiment, the main enclosure structure refers to the main structural part of the station, including walls, roof slabs, etc., which are responsible for bearing and protecting the internal space of the station. First, the main enclosure structure is constructed. Secondly, when constructing the main structure of the station, the roof slab and middle slab of the first basement floor of the subway station need to be reserved with a shaft opening for the launching shaft 1. The size of the shaft opening is 8.5m×7.6m, and 500mm is extended outward on both sides of the width of the pipe jacking pipe section to ensure that the pipe jacking can pass smoothly. The net height of the launching space is 8.7m. In the direction of vertical pipe jacking, it is the space height required for the pipe jacking to start, and this height needs to be guaranteed during construction to meet the requirements of pipe jacking construction. At the same time, a back wall 3 and an internal partition wall 2 are set and constructed synchronously, which can better form a connected whole with the roof slab and middle slab of the station structure, thereby improving the bearing capacity of the back support after the pipe jacking starts. Thirdly, a pipe jacking receiving well for the auxiliary structure also needs to be constructed, so that the pipe jacking can be smoothly received after the pipe jacking construction is completed. Finally, after the pipe jacking starts and is received, the roof slab of the main structure is sealed. After the pipe jacking construction is completed, the back wall 3 and the haunch area are chiseled, which can effectively prevent the influence on the structure during the construction process and ensure the stability of the structure.

[0081] Among them, when chiseling the back wall 3, it can be flexibly selected to retain or chisel it as a whole according to the building function requirements, which can better adapt to the actual situation and design requirements.

[0082] It should be noted that in this embodiment, when chiseling the back wall 3, the second support part 32 of the back wall 3 can be selected to be chiseled, and the first support part 31 can be retained, because the second support part 32 is added for the force requirement of the pipe jacking start. After the pipe jacking starts and is stressed, it can be selected not to be retained. Therefore, the second support part 32 of the back wall 3 is chiseled.

[0083] As Figure 3 shown, the launching position of the pipe jacking is set on the first basement floor, usually the underground floor of the station. Since the station often has 2 to 3 floors, it is necessary to build a 1 to 2 - layer temporary steel platform 8 for pipe jacking launching from the bottom slab of the station to facilitate construction operations.

[0084] The above has introduced this application in detail. Specific examples are used in this article to elaborate on the principle and implementation mode of this application. The description of the above embodiments is only used to help understand this application and its core idea. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A structure for launching pipe jacking in a subway station, characterized in that: include: A departure shaft (1), the departure shaft (1) being located in a subway station; An inner partition wall (2), wherein the inner partition wall (2) is arranged on a side wall of the launch well (1); A rear wall (3), wherein the rear wall (3) is at least partially connected to the inner partition wall (2) and at least partially extends in a direction away from the launch shaft (1); Wherein, the rear wall (3) is a T-shaped structure, and the rear wall (3) is used to bear the rearward reaction force during the pipe jacking construction; The rear wall (3) comprises a first supporting portion (31) and a second supporting portion (32), the first supporting portion (31) being connected to the second supporting portion (32), and the first supporting portion (31) and the second supporting portion (32) both extending to the horizontal direction of the subway station floor and being connected to the subway station floor.

2. The structure for pipe jacking in subway stations according to claim 1, characterized in that: It also includes a middle longitudinal beam (4), the bottom of which is at least partially connected to the inner partition wall (2) and at least partially connected to the back wall (3), and the middle longitudinal beam (4) is arranged parallel to the inner partition wall (2); The middle longitudinal beam (4) is provided with an armpit area (41), and the reaction force of the jacking pipe during jacking acts on the station top plate and the middle plate through the back wall (3).

3. The structure for pipe jacking in a subway station according to claim 1, characterized in that: It also includes a steel backrest (7), which is at least partially connected to the rear wall (3) and is used to bear the backrest reaction force during the jacking construction.

4. The structure for launching pipe jacking in a subway station according to claim 1, characterized in that: The launching well (1) is provided with an entrance (11) for drilling a jacking pipe, and the entrance (11) is located on a side opposite to the rear wall (3); Support beams (5) are provided on both sides of the entrance and exit (11), and the support beams (5) are connected to the side walls of the launching shaft (1) to strengthen the strength of the entrance and exit (11) of the launching shaft (1).

5. The structure for launching pipe jacking in a subway station according to claim 4, characterized in that: The first support portion (31) comprises a plurality of first vertical ribs (311) and second vertical ribs (312), the first vertical ribs (311) being arranged on two sides of the first support portion (31) corresponding to the entrance (11) of the launch well (1), and the second vertical ribs (312) being arranged on the other two sides of the first support portion (31); The first vertical rib (311) and the second vertical rib (312) are both arranged on the longitudinal extension line of the first support portion (31).

6. The structure for launching pipe jacking in a subway station according to claim 5, characterized in that: The second support portion (32) comprises a plurality of first reinforcing ribs (321) and second reinforcing ribs (322), the second reinforcing ribs (322) being arranged on a side of the second support portion (32) away from the first support portion (31), the first reinforcing ribs (321) being arranged on two opposite sides of the second support portion (32), and the first reinforcing ribs (321) being arranged in parallel with 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 supporting portion (32).

7. The structure for pipe jacking in a subway station according to claim 6, characterized in that: The first support portion (31) further comprises a plurality of first transverse ribs (313) and second transverse ribs (314), wherein the first transverse ribs (313) at least partially cooperate with the first vertical ribs (311), and the second transverse ribs (314) at least partially cooperate with the second vertical ribs (312), so as to achieve support for the jacking of the jacking pipe; Wherein, the second transverse rib (314) is at least partially located in the inner partition wall (2).

8. The structure for launching pipe jacking in a subway station according to claim 7, characterized in that: The second support portion (32) further comprises a plurality of first support ribs (323) and second support ribs (324), wherein 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 achieve support for the jacking of the jacking pipe; The second supporting rib (324) is at least partially connected to the second reinforcing rib (322), and at least partially extends in a direction away from the first supporting portion (31).

9. The structure for pipe jacking in a subway station according to claim 8, characterized in that: The second support portion (32) further comprises a plurality of third support ribs (325), wherein 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 achieve support when the jacking pipe is pushed.

10. A construction method for pipe jacking in a subway station, characterized in that: The method comprises the structure for launching pipe jacking in a subway station as claimed in any one of claims 1 to 9, and the method comprises the following steps: Step S1: construct the enclosure structure on the underground first floor of the station body; Step S2: When constructing the main structure of the station, a starting shaft opening is reserved, and a back wall and an inner partition wall are set up in the starting shaft, and the construction is carried out simultaneously; Step S3: construct an auxiliary jacking pipe receiving well; Step S4: After the jacking pipe is initiated and received, the main structure of the station is sealed, and after the jacking pipe construction is completed, the back wall and the armpit area are chiseled out; Wherein, in step S4, specifically also includes: Step S41: chiseling away the second supporting portion of the rear wall, retaining the first supporting portion, and retaining the inner partition wall and the middle longitudinal beam; or, According to the functional requirements of the building, determine the scope of the back wall to be removed, and retain or remove the back wall as a whole.

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