Back wall structure, pipe jacking well and pipe jacking well construction method

Abstract

The application discloses a back wall structure, a pipe jacking well and a pipe jacking well construction method. The pipe jacking well comprises the back wall structure. The back wall structure comprises steel plates, a plurality of the steel plates are arranged, the plurality of the steel plates are sequentially overlapped in the front-rear direction to form a back wall force body, a plurality of connecting assemblies are arranged, the plurality of the connecting assemblies are arranged on the left side, the right side and the upper side of the back wall force body respectively, each of the connecting assemblies comprises a connecting plate, and the connecting plate is arranged in the front-rear direction and connected with each of the steel plates. The back wall structure has sufficient strength and rigidity, has low manufacturing difficulty, can greatly shorten the construction period of the pipe jacking well, and has low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe jacking construction, in particular to a back wall structure, a pipe jacking well and a pipe jacking well construction method. BACKGROUND

[0002] With the improvement of the level of science and technology and the ability of engineering construction, the demand for traffic system optimization is increasing, which accelerates the process of urbanization and the speed of engineering construction is also faster and faster. In the main road of the city with heavy traffic or more underground pipelines, the construction of pipe network is increasing, in order to avoid the pipeline, the pipe jacking construction method is needed to bury the pipeline to a deeper underground during the construction process.

[0003] The back wall is an important structure for providing support force for the jack during the pipe jacking construction process, which needs to have enough strength and stiffness. The back wall in the existing engineering is generally a reinforced concrete layer. When the back wall is made, it needs to be bound, supported, poured and maintained, which is a relatively complicated process. After all the processes are completed, a long production cycle is needed, which affects the construction progress. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a back wall structure, a pipe jacking well and a pipe jacking well construction method.

[0005] The solution to the technical problem of the present application is:

[0006] A back wall structure comprises:

[0007] A plurality of steel plates are provided, and the plurality of steel plates are stacked in sequence along the front-rear direction to form a back wall force body;

[0008] A plurality of connecting assemblies are provided, and the plurality of connecting assemblies are respectively arranged on the left side, the right side and the upper side of the back wall force body. Each connecting assembly comprises a connecting plate which extends along the front-rear direction and is connected to each steel plate.

[0009] The present application has at least the following beneficial effects: when the back wall is made, a plurality of steel plates are stacked and connected by connecting assemblies, without the need for binding, supporting, pouring and other processes. The production cycle of the back wall is shorter, which greatly shortens the pipe jacking construction time. When the pipe jacking construction is carried out, the back wall structure is arranged in the pre-excavated foundation pit to bear the pipe jacking reaction force. Since a plurality of steel plates are stacked in the back wall structure to form a back wall force body along the front-rear direction, the strength and stiffness of the back wall structure are greatly improved, which can simultaneously bear the action of the horizontal force outside the pit and the concentrated load action force of the pipe jacking forward jacking. In addition, the force bearing surface of the steel plate in contact with the pipe jacking is flat, which can transmit the pipe jacking reaction force to the entire back wall force body and the foundation pit wall behind the back wall force body in the form of surface load.

[0010] As a further improvement of the above technical solution, each group of the connecting assembly further comprises a plurality of locking members, each locking member in the same group of connecting assembly corresponds to a steel plate, and the connecting plate is detachably connected with the steel plate through the locking member. The steel plates are locked to form a whole through the locking members, so as to obtain the back wall force body, and the connection is convenient.

[0011] As a further improvement of the above technical solution, the locking member is a connecting bolt, the connecting bolt is provided with a threaded end and an operating end, the operating end is provided with a lifting ring, the side surface of the steel plate is provided with a threaded hole, the connecting plate is provided with a through hole, the through hole is correspondingly arranged with the threaded hole, and the threaded end is arranged in the through hole and connected with the hole wall of the threaded hole. In this way, the assembly of the back wall structure is more simple and convenient, and the connecting bolt with the lifting ring can provide a fulcrum for the hoisting equipment to lift the back wall structure, which is beneficial to the construction.

[0012] A pipe jacking well comprises a steel sheet pile and a back wall structure according to any one of the above technical solutions, and the back wall structure is connected with the steel sheet pile. Since the pipe jacking well is provided with the back wall structure, it is beneficial to the subsequent pipe jacking construction. The back wall structure can provide support force for the pipe, the pipe reaction force is transmitted to the entire back wall force body and the steel sheet pile located at the rear side of the back wall force body in the form of surface load, and the steel sheet pile has the advantages of high strength, convenient construction and convenient disassembly, can disperse the load to a larger area, avoid the settlement of the pipe jacking well, and thus maintain the stability of the project.

[0013] A pipe jacking well construction method comprises the following steps:

[0014] Setting a steel sheet pile;

[0015] Excavating a foundation pit;

[0016] Sealing the bottom of the foundation pit with plain concrete;

[0017] Assembling a back wall structure;

[0018] Installing the assembled back wall structure in the foundation pit and fixing it with the steel sheet pile;

[0019] The back wall structure comprises a steel plate and a connecting assembly, the steel plate is provided with a plurality of steel plates, the plurality of steel plates are sequentially overlapped in the front-rear direction to form a back wall force body, the connecting assembly is provided with a plurality of groups, and the plurality of groups of connecting assemblies are respectively arranged on the left side, the right side and the upper side of the back wall force body. Each group of the connecting assembly comprises a connecting plate, and the connecting plate is arranged in the front-rear direction and connected with each steel plate.

[0020] The top pipe well formed through the above steps has good stability, and the construction method is simple, the quality of the project cannot excessively depend on the experience of the construction personnel in the construction process, and the problem of the open caisson can be solved; the formed top pipe well can provide good supporting force for the top pipe construction, the reaction force of the top pipe is transmitted to the entire back wall stress body and the steel sheet pile located at the rear side of the back wall stress body in the form of surface load, the strength and rigidity of the back wall structure are high, and the back wall structure can simultaneously bear the action of the horizontal force outside the pit and the concentrated load action force of the forward jacking of the top pipe.

[0021] As a further improvement of the above technical solution, the step of arranging the steel sheet piles comprises the following steps:

[0022] Measuring and positioning to determine pile points;

[0023] Excavating a guide trench according to the pile points;

[0024] Arranging the steel sheet piles in the guide trench in a screen type driving manner to form pile pits;

[0025] Arranging a supporting structure in the pile pit.

[0026] The steel sheet piles are arranged through the screen type driving manner, and the steel sheet piles are not easy to bend, twist, tilt and the like when being driven into the guide trench, and the construction precision is higher; the supporting structure is arranged in the pile pit formed by the steel sheet piles, and the supporting structure can fix the pile pit, and further improve the safety of the construction, and avoid the problems such as the inclination of the open caisson.

[0027] As a further improvement of the above technical solution, the supporting structure comprises four waist beams and four inclined braces, the four waist beams and the four inclined braces are all provided in four, the four waist beams are respectively connected with four inner wall surfaces of the front, rear, left and right of the pile pit, the four waist beams are sequentially connected in a mouth-shaped manner, and the two ends of the inclined brace are respectively connected with two adjacent waist beams. The waist beam provides a connecting position for the arrangement of the inclined brace, and can provide a supporting force for the circumferential wall of the pile pit formed by the steel sheet piles, and the inclined brace can further reinforce the four corners of the pile pit, and the waist beam and the inclined brace jointly improve the safety of the construction.

[0028] As a further improvement of the above technical solution, the step of assembling the back wall structure comprises the following steps:

[0029] Providing the connecting plate;

[0030] Holes are formed on the connecting plate, and the number of the holes is the same as that of the steel sheets, and the holes are arranged in the front-rear direction;

[0031] Threaded holes are formed on the upper side, the left side and the right side of each steel sheet;

[0032] The connecting plate with the through hole is arranged on the upper side, left side and right side of the steel plate, and the through hole corresponds to the threaded hole;

[0033] The connecting plate and the steel plate are connected by the connecting bolt.

[0034] The connecting plate and the steel plate are connected by the connecting bolt, which is convenient for installation and disassembly, facilitates the reuse of the steel plate and the connecting plate, and the assembled back wall structure has good strength and rigidity.

[0035] As a further improvement of the above technical solution, the connecting bolt is provided with a threaded end and an operating end, the threaded end is arranged in the through hole and matched with the threaded hole, and the operating end is provided with a lifting ring for connecting with a lifting device. Since the operating end is provided with the lifting ring, the lifting device can provide a fulcrum for lifting the back wall structure, without the need for additionally installing a hanging component, which is more conducive to construction and can reduce the number of parts.

[0036] As a further improvement of the above technical solution, the step of installing the assembled back wall structure in the foundation pit and fixing the steel sheet pile includes the following steps:

[0037] The back wall structure is arranged in the foundation pit, and the rear surface of the back wall structure has a gap with the steel sheet pile;

[0038] The back wall structure is sequentially welded and fixed to the steel sheet pile from bottom to top by spot welding.

[0039] The connection between the back wall structure and the steel sheet pile is achieved by welding, which has high stability, and the welding process is simple and easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly described below. Obviously, the described drawings are only some of the embodiments of the present application, not all embodiments, and those skilled in the art can obtain other design schemes and drawings from these drawings without creative labor.

[0041] Figure 1 is a structural schematic diagram of the back wall structure of the embodiment of the present application;

[0042] Figure 2 is Figure 1 is a sectional view in the A-A direction of

[0043] Figure 3 is a plan view of the pipe jacking well of the embodiment of the present application;

[0044] Figure 4 is a schematic diagram of the internal structure of a pipe jacking well according to an embodiment of the present application;

[0045] Figure 5 is a flowchart of a pipe jacking well construction method according to an embodiment of the present application;

[0046] Figure 6 is a flowchart of step S100 in Figure 5

[0047] Figure 7 is a flowchart of step S400 in Figure 5

[0048] Figure 8 is a flowchart of step S500 in Figure 5

[0049] Reference signs: 600, back wall structure; 610, steel plate; 620, connecting plate; 621, mounting groove; 630, connecting bolt; 631, lifting ring; 640, gasket; 700, steel sheet pile; 710, construction floor; 800, waist beam; 900, diagonal brace. DETAILED DESCRIPTION

[0050] Embodiments of the present application will be described in detail below with reference to the drawings, in which like or similar components that have the same or similar functions are designated by like reference numerals throughout the several views. The embodiments described below are merely exemplary for explaining the present application, and should not be construed as limiting the present application.

[0051] In the description of the present application, if the orientation description such as up, down, front, back, left, right, etc. is indicated or implied, the orientation or positional relationship based on the orientation or positional relationship shown in the drawings is merely for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0052] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more. Greater than, less than, more than, etc. are understood to exclude the number itself, and above, below, etc. are understood to include the number itself. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0053] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.​​​

[0054] Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments, other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor, all fall within the scope of protection of the present application. Various technical features in the present application can be combined with each other without conflict.

[0055] The back wall is an important structure for providing support force for the jack in the pipe jacking construction process, and needs to have sufficient strength and rigidity. The back wall in the existing project is generally a reinforced concrete layer. When the back wall is made, binding, formwork erection, pouring and maintenance are needed, and the process is relatively complicated. After all is completed, a long manufacturing period is needed, which affects the construction progress.

[0056] With reference to Figures 1 to 4 The embodiment of the present application provides a back wall structure 600 which can be applied to pipe jacking well construction, can reduce the manufacturing difficulty of the back wall structure 600, thereby reducing the pipe jacking construction difficulty, can shorten the construction period, and has low cost.

[0057] Specifically, the back wall structure 600 comprises a plurality of steel plates 610 and a plurality of connecting assemblies. In the embodiment, the steel plates 610 are provided in three pieces, and the three steel plates 610 are sequentially stacked along the front-rear direction and combined into one body to form a back wall force body.

[0058] Of course, the steel plates 610 can also be provided in other quantities, such as four pieces, five pieces, etc.

[0059] It can be understood that since the plurality of steel plates 610 are stacked along the front-rear direction to form the back wall force body, the strength and rigidity of the back wall structure 600 are greatly improved, can simultaneously bear the action of the horizontal force outside the pit and the concentrated load action force of the pipe jacking forward, and the flatness of the stress surface is good, the pipe reaction force can be transmitted to the entire back wall force body and the pit wall behind the back wall force body in the form of surface load.

[0060] In the embodiment, the upper side, the left side and the right side of the three steel plates 610 are respectively locked by the connecting assemblies. In the embodiment, each connecting assembly comprises a connecting plate 620, the connecting plate 620 extends along the front-rear direction, the front end of the connecting plate 620 reaches the front end of the back wall force body, and the rear end of the connecting plate 620 reaches the rear end of the back wall force body, and the side walls of the three steel plates 610 are connected with the same connecting plate 620. Through the connecting action of the connecting plate 620, the three steel plates 610 are combined into one body and kept fixed.

[0061] In the embodiment, the front side of the steel plate 610 is a square with a side length of 2 meters, which has a sufficient force receiving area, and the thickness of the steel plate 610 is 0.1 meters, which has sufficient strength and is easy to connect with the connecting plate 620.

[0062] It can be understood that the connection between the connecting plate 620 and the steel plate 610 can be achieved by welding or locking by using locking members such as connecting bolts 630. In the same group of connecting assemblies, a plurality of locking members are included, the number of locking members is the same as the number of steel plates 610, and each locking member corresponds to a steel plate 610. Using locking members to connect the steel plate 610 and the connecting plate 620 can achieve detachable connection between the steel plate 610 and the connecting plate 620, and the disassembled steel plate 610 and connecting plate 620 are easier to store, which is conducive to the reuse of the steel plate 610 and the connecting plate 620, and further saves costs.

[0063] In the embodiment, the locking member is a connecting bolt 630, and each group of connecting assemblies includes three connecting bolts 630. The connecting bolt 630 has a threaded end, and the upper side, left side and right side of the steel plate 610 are provided with threaded holes which are matched with the threaded end of the connecting bolt 630. The connecting plate 620 is provided with three through holes arranged in the front-rear direction, and when the connecting plate 620 is arranged on the side of the back wall force body, the three through holes correspond to the threaded holes of the three steel plates 610 respectively, the threaded end of the connecting bolt 630 can pass through the through hole and be inserted into the threaded hole to achieve threaded connection with the steel plate 610.

[0064] It can be understood that the connecting bolt 630 also has an operating end for rotating the connecting bolt 630 to screw the connecting bolt 630 into the threaded hole. In the embodiment, the operating end is provided with a lifting ring 631. The lifting ring 631 can provide a fulcrum for lifting equipment to lift the back wall structure 600, which is more conducive to the subsequent installation of the back wall structure 600.

[0065] In the embodiment, the connecting plate 620 is provided with a mounting groove 621 which penetrates the front and rear end faces of the connecting plate 620. The mounting groove 621 of the connecting plate 620 located on the upper side of the back wall force body is opened with a notch towards the upper side; the mounting groove 621 of the connecting plate 620 located on the left side of the back wall force body is opened with a notch towards the left side; and the mounting groove 621 of the connecting plate 620 located on the right side of the back wall force body is opened with a notch towards the right side. The through hole is arranged on the mounting groove 621, the connecting bolt 630 is inserted into the mounting groove 621, and the lifting ring 631 extends out of the notch of the mounting groove 621.

[0066] In the embodiment, the connecting assembly further comprises a gasket 640 made of steel material, which is sleeved on the connecting bolt 630 and arranged between the threaded end of the connecting bolt 630 and the lifting ring 631, and abuts against the side wall of the steel plate 610. It can be understood that the gasket 640 can prevent the connecting bolt 630 from loosening the connection between the steel plate 610 and the connecting plate 620, and protect the connecting plate 620 and the connecting bolt 630.

[0067] It can be understood that the connection of the three steel plates 610 is realized by the connecting assembly, which takes into account the characteristics of convenient, fast, simple and repeated use, greatly improves the efficiency of the assembled back wall structure 600 and the installed back wall structure 600, and thus shortens the construction period.

[0068] It can be understood that multiple groups of connecting assemblies can be arranged on the same side of the back wall force body, such as the three groups of connecting assemblies arranged on the upper side, the left side and the right side of the back wall force body in the embodiment. The three groups of connecting assemblies on the upper side are arranged in the left-right direction, and the three groups of connecting assemblies on the left side and the right side are arranged in the up-down direction. In the embodiment, the connecting assemblies are arranged symmetrically left and right to ensure that the left and right forces of the back wall force body are evenly distributed.

[0069] Another embodiment of the present application provides a pipe jacking well, which is described with reference to Figure 3 and Figure 4 The pipe jacking well comprises a steel sheet pile 700 and the back wall structure 600 according to any one of the above embodiments. After the steel sheet pile 700 is arranged, the steel sheet pile 700 can form a pile pit, and subsequent foundation pit excavation can be performed along the inner wall of the pile pit. The back wall structure 600 is arranged in the subsequently excavated foundation pit, and the rear end surface of the back wall structure 600 is connected with the inner wall surface of the pile pit formed by the steel sheet pile 700. During construction, the pipe jacking is pushed forward from the inner front wall of the foundation pit, and the rear end of the pipe jacking exerts a counterforce on the front end surface of the back wall structure 600. The counterforce of the pipe jacking is transmitted to the entire back wall force body and the wall surface of the steel sheet pile 700 behind the back wall force body in the form of surface load.

[0070] It can be understood that the traditional pipe jacking well generally adopts the form of a reinforced concrete caisson structure or a reinforced concrete top-down method structure. The overall integrity and stability of the reinforced concrete structure can be guaranteed, but the construction period is long, the construction technology requirement is high, the cost is high, and moreover, the sinking process of the caisson structure is prone to sinking too fast, which may lead to problems such as inclination of the caisson or difficulty in sinking, and the construction personnel need to correct the deviation and take appropriate sinking measures in time, which increases the complexity of construction.

[0071] In the embodiment, the steel sheet pile 700 is used to form a pile pit, and the back wall structure 600 and the steel sheet pile 700 can transmit the reaction force of the jack thrust to the soil in the rear part of the foundation pit, thereby solving the problem of too fast sinking of the caisson, and the steel sheet pile 700 has the advantages of high strength, convenient construction, convenient disassembly, and the like, and can disperse the load to a large area to avoid excessive pressure and settlement, thereby maintaining the stability of the project.

[0072] In the embodiment, the pipe jacking well further comprises a support structure for supporting the steel sheet pile 700, further ensuring the safety of construction and the stability of the steel sheet pile 700. Specifically, the support structure comprises four waist beams 800 and four inclined braces 900, the four waist beams 800 and the four inclined braces 900 are arranged in the pile pit formed by the steel sheet pile 700, the four waist beams 800 are respectively connected with the front, rear, left and right inner walls of the pile pit and are arranged at the upper part of the pile pit, the four waist beams 800 are connected end to end and surround a support frame in the shape of a mouth, and the inclined braces 900 are arranged at the four corners of the support frame and are respectively connected with the two adjacent waist beams 800 at two ends.

[0073] The embodiment of the present application further provides a pipe jacking well construction method which can realize the layout of the pipe jacking well in the above embodiment, and specifically comprises the following steps S100, S200, S300, S400 and S500. Figure 5

[0074] The step S100 is to arrange the steel sheet pile 700, which can more safely excavate the foundation pit and realize pipe jacking construction, and specifically comprises the following steps S110, S120, S130 and S140, which are described below with reference to Figure 6 The step S110 is to measure and locate to determine the pile point. The step S120 is to excavate a guide trench according to the pile point. The step S130 is to arrange the steel sheet pile 700 in the guide trench in a screen type driving manner to form a pile pit. The step S140 is to arrange a support structure in the pile pit.

[0075] In the step S110, the position of pipe jacking construction is calculated and planned in advance to avoid low pipelines. In the step S120, a positioning guide beam can be used to guide after the guide trench is excavated to ensure the verticality of the steel sheet pile 700 in the step S130. In the step S130, 10 to 20 steel sheet piles 700 are inserted into the guide trench in a row to form a screen, and then are driven, so that the steel sheet pile 700 is not prone to defects such as buckling, twisting and tilting, the driving precision is high, and the closed and closed pile pit is easy to realize. The step S140 can ensure the safety of subsequent foundation pit excavation and the stability of the construction project.

[0076] ​In the embodiment, the steel sheet pile 700 is a dense-drawing Larsen steel sheet pile, which is convenient to construct and simple to operate. In the construction process, the trench does not need to be excavated too much, and the amount of soil taken is small. Therefore, the steel sheet pile 700 can effectively save labor costs and shorten the construction period. Compared with traditional concrete products, the steel sheet pile 700 is more time-saving, labor-saving and cost-saving, has a long service life, and can be reused.

[0077] It can be understood that the support structure includes the waist beam 800 and the inclined brace 900, and the specific connection mode of the support structure has been described in the above embodiment, which will not be repeated here. The waist beam 800 is made of double-spliced I-beams. When the support structure is arranged, the end of the waist beam 800 is welded to the steel sheet pile 700 through a lifting rib, and a triangular support frame is arranged below the position where the waist beam 800 is welded to the steel sheet pile 700 to strengthen and fix the waist beam 800.

[0078] In step S200, the foundation pit is excavated. After the steel sheet pile 700 forms the pile pit, the soil in the pile pit is excavated to obtain the foundation pit. The foundation pit is used to place the back wall structure 600, and the top pipe and the pipe jacking machine can be placed to a proper underground depth position from above the foundation pit, so that the pipe can be buried at a deeper underground position.

[0079] In step S300, the foundation pit is sealed with plain concrete. The use of plain concrete for sealing can increase the stability of the steel sheet pile 700. The plain concrete sealing can solve the problem of uneven bottom surface and form a construction bottom plate 710. In the embodiment, after the foundation pit is excavated to the bottom, 500mm-thick plain concrete is immediately used for sealing to ensure the quality of the sealing.

[0080] In step S400, the back wall structure 600 is assembled. The back wall structure 600 is any back wall structure 600 proposed in the above embodiments, which includes a plurality of steel sheets 610 and a connecting assembly. The back wall structure 600 has been described in detail in the above embodiments, which will not be repeated here.

[0081] The back wall structure 600 is simple to assemble. In the embodiment, the assembly of the back wall structure 600 includes steps S410, S420, S430, S440 and S450, which are described with reference to Figure 7 .

[0082] In step S410, the connecting plate 620 is provided. The connecting plate 620 can be provided with a mounting groove 621, which penetrates the front and rear end faces of the connecting plate 620. The connecting plate 620 with the mounting groove 621 is more convenient. The connecting plate 620 in the embodiment is made of steel.

[0083] In step S420, a plurality of through holes are formed on the connecting plate 620, which are arranged in the front-rear direction. In the embodiment, the through holes are arranged in the mounting groove 621.

[0084] Step S430, threaded holes are formed on the upper side, left side and right side of each steel plate 610. It can be understood that the completion order of step S420 and step S430 is not limited, step S420 can be completed first, or step S430 can be completed first.

[0085] Step S440, the connecting plate 620 with the through hole is arranged on the upper side, left side and right side of the steel plate 610, and the through hole corresponds to the threaded hole.

[0086] Step S450, the connecting plate 620 and the steel plate 610 are connected by using the connecting bolt 630. The connecting bolt 630 is provided with a threaded end and an operating end, the threaded end is inserted through the through hole of the connecting plate 620 and is connected with the threaded hole on the steel plate 610 through threaded connection, so that the connection between the connecting plate 620 and the steel plate 610 is completed.

[0087] Step S500, the assembled back wall structure 600 is installed in the foundation pit and fixed with the steel sheet pile 700. Step S500 includes step S510 and step S520, which are described with reference to Figure 8 .

[0088] Step S510, the back wall structure 600 is arranged in the foundation pit, and the rear surface of the back wall structure 600 has a gap with the steel sheet pile 700. In this embodiment, the operating end of the connecting bolt 630 is a lifting ring 631, which can provide a connecting fulcrum for hoisting equipment, and the assembled back wall structure 600 can be conveniently sent into the foundation pit by using the hoisting equipment.

[0089] Step S520, the back wall structure 600 and the steel sheet pile 700 are fixed by spot welding. It can be understood that the gap between the back wall structure 600 and the steel sheet pile 700 is to make it more convenient to spot weld, and the fixing between the back wall structure 600 and the steel sheet pile 700 is realized by spot welding, which has good connection stability. In this embodiment, five welding points are arranged between the back wall structure 600 and the steel sheet pile 700, which are arranged in the up-down direction, and can achieve the required connection strength. During the welding process, the spot welding is performed from bottom to top.

[0090] The pipe jacking well construction method of this embodiment has lower technical requirements for construction personnel compared with the construction method using reinforced concrete open caisson structure, the construction personnel has less deviation and needs to take sinking measures, the construction complexity is greatly reduced, and the cost is low and the construction period is short.

[0091] The preferred embodiments of the present application have been disclosed with specific reference to a preferred embodiment. A person with ordinary skill in the art understands that variations in, or replacements for, the preferred embodiments described herein can be made without departing from the spirit of the application. These equivalent variations or replacements are also encompassed within the scope of the claims defined below.

Claims

1. A back wall structure, characterized by, The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction.

2. A pipe jacking shaft, characterized in that The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction.

3. A pipe jacking construction method characterized by, The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction.

4. The pipe jacking construction method according to claim 3, characterized by, The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction.

5. The pipe jacking method according to claim 4, characterized in that, The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction.

6. The pipe jacking construction method according to claim 3, characterized by, The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to the technical field of construction. The utility model relates to a back wall structure and a method for assembling the same, and belongs to The connecting plate with the through hole is arranged on the upper side, left side and right side of the steel plate, and the through hole corresponds to the threaded hole; The connecting plate and the steel plate are connected by using a connecting bolt.

7. The pipe jacking construction method according to claim 3, characterized by, The step of mounting the assembled back wall structure in the foundation pit and fixing the steel sheet pile includes the following steps: The back wall structure is arranged in the foundation pit, and the back surface of the back wall structure has a gap with the steel sheet pile; The back wall structure is sequentially welded and fixed with the steel sheet pile from bottom to top by spot welding.

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