Rectangular top pipe working well structure and construction method thereof

Abstract

The application discloses a rectangular top pipe working well structure and a construction method, which comprises a starting well and a receiving well arranged at two ends of a working hole where a top pipe is needed to be inserted; the starting well and the receiving well are both rectangular working wells and both comprise two opposite end walls and two opposite side walls; one end wall of the starting well is provided with a working hole insertion end, and the other end wall is a starting well bearing wall for bearing the load when the top pipe is inserted; one end wall of the receiving well is provided with a working hole ejection end, and the other end wall is a receiving well bearing wall for bearing the load when the top pipe is inserted; a backstop wall and a jacking device comprising a counterforce device are arranged in the starting well from the starting well bearing wall to the working hole direction, and the top pipe is inserted into the working hole through the jacking device; a lock chain is arranged in the top pipe; one end of the lock chain is connected with the receiving well bearing wall, and the other end is connected with the counterforce device of the jacking device. The application can improve the construction efficiency, reduce the construction cost and be safer and more reliable.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction technology, and in particular to the structure of a rectangular pipe jacking working shaft and its construction method. Background Technology

[0002] Pipe jacking, as an underground engineering construction method, is widely used in projects that cross urban pipelines and buildings, and sometimes in projects that cross key urban roads. Compared with shield tunnel construction and shallow buried tunnel construction, it has advantages such as fewer joints, simpler procedures, and shorter construction period.

[0003] Pipe jacking is the first stage in subway tunnel construction. Current pipe jacking launching shaft construction requires excavation of the foundation pit, reinforcement binding, formwork erection, concrete pouring, and backfilling. This process is costly, risky, and results in weak contact between the walls and the surrounding soil, leading to a lack of overall integrity. If the external retaining structure were entirely constructed using bored piles, the cost would be very high, the environmental impact would be significant, and the efficiency would be low.

[0004] Furthermore, after the pipe jacking machine begins operation in the launching shaft, it spends a considerable amount of time grinding the working shaft wall and excavating the channel for the machine to operate. Removing the retaining structure's steel plates or reinforced concrete causes wear and tear on the machine head, further consuming more time and money.

[0005] Therefore, how to improve construction efficiency while reducing construction costs has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of the above-mentioned deficiencies of the prior art, the present invention provides a rectangular pipe jacking working well structure and its construction method, the purpose of which is to improve construction efficiency while reducing construction costs, and to make it safer and more reliable.

[0007] To achieve the above objectives, the present invention discloses a rectangular pipe jacking working well structure, including a launching well and a receiving well disposed at both ends of the working hole into which the pipe needs to be jacked.

[0008] Both the launching well and the receiving well are rectangular working wells, each including two opposing end walls and two opposing side walls.

[0009] One end wall of the launching shaft is provided with the working hole jacking end, and the other end wall is the launching shaft bearing wall that bears the load when the jacking pipe is jacked in;

[0010] One end wall of the receiving well is provided with the working hole ejection end, and the other end wall is the receiving well bearing wall that bears the load when the jacking pipe is pushed in;

[0011] An inclined slope structure is provided upwards from the bearing wall of the launching well and the bearing wall of the receiving well;

[0012] Inside the launching shaft, a rear support wall and a jacking device including a reaction force device are provided from the launching shaft bearing wall toward the working hole. The jacking device is used to push the jacking pipe into the working hole.

[0013] The jacking pipe is equipped with a chain;

[0014] One end of the chain is connected to the receiving well support wall, and the other end is connected to the rear seat wall.

[0015] Preferably, the outer side of each sidewall of the launching shaft and the receiving shaft is temporarily supported by steel sheet piles.

[0016] Preferably, multiple bored piles are provided on the outer side of both the launching well bearing wall and the receiving well bearing wall;

[0017] Concrete is sprayed between every two adjacent bored piles to form a closed waterstop wall.

[0018] Preferably, a reaction support is provided between the reaction device and the rear wall; a top iron is provided between the reaction device and the jacking pipe.

[0019] Preferably, the bottom of both the launching well and the receiving well are provided with a pad layer and a crossbeam from bottom to top;

[0020] The crossbeam is equipped with steel rails according to the movement trajectory of the jacking pipe.

[0021] More preferably, the subbase is a composite subbase, comprising a lower layer of crushed stone and an upper layer of concrete.

[0022] Preferably, each side wall and each end wall of the launching well and the receiving well are reinforced with steel bars.

[0023] Preferably, the inner diameter of the working hole is at least 20 cm ± 5% larger than the outer diameter of the jacking pipe.

[0024] The present invention also provides a construction method for a rectangular pipe jacking working well structure, characterized by comprising the following steps:

[0025] Step 1: Starting from the bearing wall of the launching well and the bearing wall of the receiving well, cut a portion of the soil upwards to form an inclined slope structure.

[0026] Step 2: Multiple bored piles are installed on the outer side of both the starting well bearing wall and the receiving well bearing wall, and concrete is sprayed between every two adjacent bored piles to form a closed waterstop wall;

[0027] Step 3: After laying out the area around the launching well and the receiving well, excavate the corresponding foundation pits, set the working holes in the launching well and the receiving well, and fill the working holes with soft soil to seal them;

[0028] Step 4: Lay a cushion layer and reinforcing steel bars for the crossbeams at the bottom of the launching well and the receiving well, and cast the crossbeams together with the corresponding end walls and side walls as a whole;

[0029] Step 5: Set up a jacking device including a reaction device and a steel rail, and install a jacking pipe on the steel rail. Connect the rear wall and the receiving well support wall through the chain.

[0030] Step 6: Start the jacking device to carry out pipe jacking operations.

[0031] Preferably, in step 3, before excavating the foundation pit, steel sheet piles are used for temporary support on the outer side of each of the side walls of the launching well and the receiving well.

[0032] The beneficial effects of this invention are:

[0033] By setting an inclined slope structure, the present invention allows for shorter bored piles installed after excavation. This not only effectively supports the soil outside the foundation pit, preventing soil collapse, but also improves work efficiency and saves construction costs.

[0034] This invention improves the integrity and strength of the working well by arranging crossbeams at the bottom and casting the entire structure.

[0035] This invention reduces wear on the jacking head during pipe jacking by reserving a working hole, thereby improving work efficiency.

[0036] This invention connects two working wells with a chain to form a whole, which increases the jacking thrust on one side of the starting well reaction device and improves the stability and safety of the overall structure of the starting well.

[0037] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0038] Figure 1 A schematic diagram of an embodiment of the present invention is shown.

[0039] Figure 2 This diagram shows a longitudinal cross-sectional view of the completed rail arrangement in one embodiment of the present invention.

[0040] Figure 3 This diagram shows a planar structure of the completed rail arrangement according to an embodiment of the present invention. Detailed Implementation

[0041] Example

[0042] like Figure 1 As shown, the rectangular pipe jacking working well structure includes a launching well 11 and a receiving well 12 located at both ends of the working hole 3 into which the pipe jacking 15 needs to be inserted.

[0043] Both the launching well 11 and the receiving well 12 are rectangular working wells, each including two opposite end walls and two opposite side walls.

[0044] One end wall of the launching shaft 11 is provided with a working hole 3 for the jacking end, and the other end wall is the launching shaft bearing wall 2, which bears the load when the jacking pipe is jacked in;

[0045] One end wall of the receiving well 12 is provided with a working hole 3 for the top outlet, and the other end wall is a receiving well bearing wall 14 that bears the load when the jacking pipe is pushed in;

[0046] An inclined slope structure is provided from the starting well bearing wall 2 of the starting well 11 and the receiving well bearing wall 14 of the receiving well 12 upwards;

[0047] Inside the launching shaft 11, a rear seat wall 4 and a jacking device including a reaction device 6 are provided from the launching shaft bearing wall 2 toward the working hole 3. The jacking device pushes the jacking pipe 15 into the working hole 3.

[0048] A chain 13 is installed inside the jacking pipe 15;

[0049] One end of the chain 13 is connected to the receiving well support wall 14, and the other end is connected to the rear seat wall 4.

[0050] The sloping structure of the present invention, starting from the bearing wall 2 of the starting well and the bearing wall 14 of the receiving well, makes the length of the bored pile 1 set on the outside shorter, which can save costs. Vehicles can also travel on the sloping structure in the later stage, which facilitates the transportation of materials and equipment.

[0051] The crossbeam 9 not only improves the overall integrity of the working shaft, but also serves as an operating platform for small excavation equipment inside the pipe jacking machine head. The jacking device, including the reaction device 6, and the rail 8 are arranged on the crossbeam 9, which is more stable and safer than directly laying the rail.

[0052] Filling the working hole 3 with soft soil to seal it can prevent collapse and soil erosion, while eliminating the need for the grinding work of breaking the traditional working well wall when the pipe jacking machine head is advancing, thus improving jacking efficiency and reducing wear on the machine head.

[0053] The reaction device 6 and the receiving well bearing wall 14 of the receiving well 12 are connected by a cable chain 13, so that the receiving well bearing wall 14 can bear part of the load of the reaction device 6 during jacking, provide part of the jacking thrust of the launching well, avoid insufficient jacking force caused by cutting soil on one side of the launching well, and improve the stability and safety of the launching well.

[0054] In some embodiments, the outer side of each side wall of the launching shaft 11 and the receiving shaft 12 is temporarily supported by sheet piles.

[0055] In some embodiments, multiple bored piles 1 are provided on the outer sides of both the launching well bearing wall 2 and the receiving well bearing wall 14;

[0056] Concrete is sprayed between every two adjacent bored piles to form a closed waterstop wall.

[0057] In some embodiments, a reaction support 5 is provided between the reaction device 6 and the rear wall 4; a top iron 7 is provided between the reaction device 6 and the jacking pipe.

[0058] In some embodiments, the bottom of both the launching well 11 and the receiving well 12 are provided with a pad layer 10 and a crossbeam 9 from bottom to top;

[0059] A steel rail 8 is provided on the crossbeam 9 according to the moving trajectory of the jacking pipe 15.

[0060] In some embodiments, the subbase 10 is a composite subbase, comprising a lower layer of crushed stone and an upper layer of concrete.

[0061] In some embodiments, each side wall and each end wall of the launching well 11 and the receiving well 12 are reinforced with steel bars.

[0062] In some embodiments, the inner diameter of the working hole 3 is at least 20 cm ± 5% larger than the outer diameter of the jacking pipe 15.

[0063] like Figures 1 to 3 As shown, the present invention also provides a construction method for a rectangular pipe jacking working well structure, characterized by comprising the following steps:

[0064] Step 1: Starting from the starting well bearing wall 2 of the starting well 11 and the receiving well bearing wall 14 of the receiving well 12, cut the soil upwards to form an inclined slope structure.

[0065] Step 2: Multiple bored piles 1 are installed on the outer side of both the starting well bearing wall 2 and the receiving well bearing wall 14, and concrete is sprayed between every two adjacent bored piles 1 to form a closed waterstop wall.

[0066] Step 3: After laying out the layout around the launching well 11 and receiving well 12, excavate the corresponding foundation pits, set up working holes 3 in the launching well 11 and receiving well 12, and fill the working holes 3 with soft soil to seal them.

[0067] Step 4: Lay the foundation layer 10 and the reinforcing steel of the crossbeam 9 at the bottom of the launching well 11 and the receiving well 12, and cast the crossbeam 9 together with the corresponding end wall and the corresponding side wall as a whole.

[0068] Step 5: Set up a jacking device including a reaction device 6 and a steel rail 8, and install a jacking pipe 15 on the steel rail 8. Connect the rear seat wall 4 and the receiving well bearing wall 14 through a chain 13.

[0069] Step 6: Start the jacking device to carry out pipe jacking operations.

[0070] In some embodiments, in step 3, before excavating the foundation pit, temporary support is provided on the outer side of each side wall of the launching well 11 and the receiving well 12 using sheet piles.

[0071] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A construction method for a rectangular pipe jacking working shaft structure, comprising a launching shaft (11) and a receiving shaft (12) set at both ends of a working hole (3) into which the pipe jacking (15) needs to be inserted; characterized in that: The launching well (11) and the receiving well (12) are both rectangular working wells, each including two opposite end walls and two opposite side walls; One end wall of the starting well (11) is provided with the working hole (3) jacking end, and the other end wall is the starting well bearing wall (2) that bears the load when the jacking pipe is jacked in. One end wall of the receiving well (12) is provided with the working hole (3) ejection end, and the other end wall is the receiving well bearing wall (14) that bears the load when the jacking pipe is pushed in. An inclined slope structure is provided upwards from the starting well bearing wall (2) of the starting well (11) and the receiving well bearing wall (14) of the receiving well (12); Inside the starting well (11), a rear seat wall (4) and a jacking device including a reaction device (6) are provided from the starting well bearing wall (2) toward the working hole (3). The jacking device pushes the jacking pipe (15) into the working hole (3). The jacking pipe (15) is equipped with a chain (13); One end of the chain (13) is connected to the receiving well support wall (14), and the other end is connected to the rear seat wall (4); The outer side of each of the side walls of the launching shaft (11) and the receiving shaft (12) is temporarily supported by steel sheet piles; The construction process is as follows: Step 1: Starting from the bearing wall (2) of the starting well (11) and the bearing wall (14) of the receiving well (12), cut part of the soil upward to form an inclined slope structure. Step 2: Multiple bored piles (1) are installed on the outer side of both the starting well bearing wall (2) and the receiving well bearing wall (14), and concrete is sprayed between every two adjacent bored piles (1) to form a closed waterstop wall; Step 3: After laying out the layout around the launching well (11) and the receiving well (12), excavate the corresponding foundation pit, set the working hole (3) in the launching well (11) and the receiving well (12), and fill the working hole (3) with soft soil to seal the hole; Step 4: Lay a cushion layer (10) and reinforcing steel bars for the crossbeam (9) at the bottom of the launching well (11) and the receiving well (12), and cast the crossbeam (9) together with the corresponding end wall and the corresponding side wall into a whole; Step 5: Set up a jacking device including a reaction device (6) and a rail (8), and set up a jacking pipe (15) on the rail (8), and connect the rear seat wall (4) and the receiving well bearing wall (14) through the chain (13); Step 6: Start the jacking device to carry out pipe jacking operations.

2. The construction method of the rectangular pipe jacking working well structure according to claim 1, characterized in that, Multiple bored piles (1) are provided on the outer sides of both the launching well bearing wall (2) and the receiving well bearing wall (14). Concrete is sprayed between every two adjacent bored piles (1) to form a closed waterstop wall.

3. The construction method of the rectangular pipe jacking working well structure according to claim 1, characterized in that, A reaction support (5) is provided between the reaction device (6) and the rear seat wall (4); a top iron (7) is provided between the reaction device (6) and the jacking pipe.

4. The construction method of the rectangular pipe jacking working well structure according to claim 1, characterized in that, The bottom of both the launching well (11) and the receiving well (12) are provided with a pad layer (10) and a crossbeam (9) from bottom to top. The crossbeam (9) is provided with rails (8) according to the movement trajectory of the jacking pipe (15).

5. The construction method of the rectangular pipe jacking working well structure according to claim 4, characterized in that, The cushion layer (10) is a composite cushion layer, consisting of crushed stone at the bottom and concrete at the top.

6. The construction method of the rectangular pipe jacking working well structure according to claim 1, characterized in that, Each side wall and each end wall of the launching well (11) and the receiving well (12) are reinforced with steel bars.

7. The construction method of the rectangular pipe jacking working well structure according to claim 1, characterized in that, The inner diameter of the working hole (3) is 20 cm ± 5 cm larger than the outer diameter of the jacking pipe (15).

8. The construction method of the rectangular pipe jacking working well structure according to claim 1, characterized in that, In step 3, before excavating the foundation pit, steel sheet piles are used for temporary support on the outside of each of the side walls of the launching well (11) and the receiving well (12).

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