Pipe jacking open caisson structure

Abstract

The utility model relates to the technical field of pipe-jacking open caissons, in particular to a pipe-jacking open caisson structure which comprises an open caisson body, the open caisson body comprises a first assembly well, a second assembly well, a third assembly well and a fourth assembly well, and a connecting assembly is arranged on the inner side of the open caisson body. The connecting assembly comprises a first pouring hole, a first clamping groove, a first clamping block, a first fixing rib, a second pouring hole, a second clamping groove, a second clamping block, a second fixing rib, a third pouring hole, a third clamping groove, a third clamping block and a third fixing rib. Concrete sealing blocks are poured into the first clamping groove, the second clamping groove and the third clamping groove. The multiple groups of prefabricated assembly wells are mutually spliced, the installation and transportation efficiency of the open caisson body is improved, meanwhile, concrete is poured into the clamping grooves through the pouring holes, the connecting positions of the multiple groups of assembly wells are sealed, and the sealing performance of the connecting positions of the multiple groups of assembly wells is improved while the connecting strength of the multiple groups of assembly wells is improved; and the waterproof performance of the open caisson body is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of pipe jacking caisson technology, and specifically to a pipe jacking caisson structure. Background Technology

[0002] To ensure smooth traffic flow in urban areas and reduce the surface excavation area for underground projects, pipe jacking is mainly used in undergrounding or renovation projects for rainwater, sewage, and communication and power pipelines. As an important component of pipe jacking, the construction progress of the working shaft has a significant impact on the overall project progress. To improve the construction progress, prefabricated assembled caissons are usually used. To improve the stability of the connection between the two sets of assembled modules, connectors are usually used for connection.

[0003] Among them, announcement number CN221919493U discloses a prefabricated assembly structure for pipe jacking caissons, including several sets of assembly mechanisms connected in sequence in the vertical direction; the setting of the connecting components facilitates the rapid assembly of the assembly mechanism, and pipe jacking caissons of different sizes can be assembled as needed, with high connection stability, quick and convenient assembly, improved assembly quality, and improved processing efficiency.

[0004] However, this caisson structure has lower sealing performance compared to a monolithic cast-in-place caisson structure. Since the caisson is located deep underground, groundwater can easily seep into the caisson through the joints of the components during long-term use, which can easily corrode the equipment inside the caisson and affect the safety of the equipment.

[0005] Therefore, it is necessary to invent a pipe jacking shaft structure to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a jacking shaft structure to solve the problem of low sealing performance in the technology, which allows groundwater to easily seep into the shaft through the joints of the fittings, affecting the safety of equipment use.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a jacking caisson structure, comprising a caisson body, the caisson body including a first assembly caisson, a second assembly caisson, a third assembly caisson and a fourth assembly caisson, a connecting assembly provided on the inner side of the caisson body, the connecting assembly including a first injection hole, a first snap-fit ​​groove, a first snap-fit ​​block, a first fixing rib, a second injection hole, a second snap-fit ​​groove, a second snap-fit ​​block, a second fixing rib, a third injection hole, a third snap-fit ​​groove, a third snap-fit ​​block and a third fixing rib, the first snap-fit ​​groove, the second snap-fit ​​groove and the third snap-fit ​​groove are filled with concrete sealing blocks.

[0008] By adopting the above technical solution, multiple sets of assembly wells are prefabricated and fixed together by multiple sets of snap-fit ​​grooves and snap-fit ​​blocks, which improves the splicing accuracy. At the same time, concrete is poured into the snap-fit ​​grooves through multiple sets of injection holes, and concrete sealing blocks are used to seal the connection points of the multiple sets of assembly wells. This not only improves the connection strength of the multiple sets of assembly wells, but also improves the sealing performance of the connection points, thereby effectively improving the waterproof performance of the caisson body, preventing groundwater from seeping into the interior, and improving the safety of the equipment inside the caisson body.

[0009] Optionally, the upper surface of the first assembly well is provided with a plurality of first injection holes, the first snap-fit ​​groove is provided at the lower end of the first assembly well, and the lower end of the first injection hole communicates with the first snap-fit ​​groove.

[0010] By adopting the above technical solution, the first injection hole is used to inject concrete into the interior of the first snap-fit ​​groove.

[0011] Optionally, the first snap-fit ​​block is cast at the upper end of the second assembly well, and multiple sets of first fixing ribs are fixedly connected to the upper side of the first snap-fit ​​block. Multiple sets of second injection holes are opened on the surface of the first snap-fit ​​block, and the second snap-fit ​​groove is opened at the lower end of the second assembly well. The lower end of the second injection hole communicates with the second snap-fit ​​groove.

[0012] By adopting the above technical solution, the first snap-fit ​​block is snapped into the interior of the first snap-fit ​​groove to splice the first assembly well and the second assembly well, and the second injection hole is used to inject concrete into the interior of the second snap-fit ​​groove.

[0013] Optionally, the second snap-fit ​​block is cast on the upper end of the third assembly well, and multiple sets of second fixing ribs are fixedly connected to the upper side of the second snap-fit ​​block. Multiple sets of third injection holes are opened on the surface of the second snap-fit ​​block, and the third snap-fit ​​groove is opened at the lower end of the third assembly well. The lower end of the third injection hole communicates with the third snap-fit ​​groove.

[0014] By adopting the above technical solution, the second snap-fit ​​block is snapped into the interior of the second snap-fit ​​groove to splice the second assembly well and the third assembly well, and the third injection hole is used to inject concrete into the interior of the third snap-fit ​​groove.

[0015] Optionally, the third snap-fit ​​block is cast at the upper end of the fourth assembly well, and multiple sets of third fixing ribs are fixedly connected to the upper side of the third snap-fit ​​block. A bottom sealing concrete layer is cast on the lower side inside the fourth assembly well, and a waterstop strip is cast on the upper side of the bottom sealing concrete layer.

[0016] By adopting the above technical solution, the third snap-fit ​​block is snapped into the interior of the third snap-fit ​​groove to splice the third assembly well and the fourth assembly well. The bottom sealing concrete is used to seal the lower end of the caisson body, and the water-stop strip is used to prevent groundwater from seeping into the bottom of the caisson body.

[0017] Optionally, a side baffle is poured at the outer edge of the upper end of the first assembly well, and two sets of concrete top covers are snapped at the inner edge of the upper end of the first assembly well. A caisson climbing opening is opened at the rear end of the concrete top cover on the right side.

[0018] By adopting the above technical solution, the concrete top cover is used to seal the upper end of the caisson body, and the caisson access opening is used to enter and exit the interior of the caisson body, which facilitates the maintenance of the equipment inside the caisson body.

[0019] Optionally, a first reserved hole is provided on the front surface of the third assembly well, and a first equipment pipe is connected inside the first reserved hole. Two sets of second reserved holes are provided on the right side of the third assembly well, and a second equipment pipe is connected inside the second reserved hole.

[0020] By adopting the above technical solution, the diameter of the first equipment pipe is 800mm and the diameter of the second equipment pipe is 500mm. The first equipment pipe is inserted into the first reserved hole and the second equipment pipe is inserted into the second reserved hole. The gap is sealed with concrete.

[0021] Optionally, water-stopping piles are poured around the perimeter of the caisson body, and foundation treatment piles are poured at the bottom of the caisson body.

[0022] By adopting the above technical solution, the diameter of the water-stopping piles and the foundation treatment piles is 600mm. Both are injected using the high-pressure jet grouting method. The water-stopping piles are used to block the surrounding groundwater and further reduce the impact of groundwater on the caisson body. At the same time, multiple sets of foundation treatment piles reinforce the foundation on the lower side of the caisson body, improve the stability of the caisson body, and prevent the caisson body from sinking.

[0023] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0024] 1. This utility model improves the ease of installation by using multiple sets of prefabricated assembly wells spliced ​​together. At the same time, concrete is poured into multiple sets of interlocking grooves through multiple injection holes, and concrete sealing blocks are used to seal the connection points of the multiple sets of assembly wells. This not only improves the connection strength of the multiple sets of assembly wells, but also improves the sealing performance of the connection points, thereby effectively improving the waterproof performance of the caisson body, preventing groundwater from seeping into the interior, and improving the safety of the equipment inside the caisson body.

[0025] 2. This utility model involves casting water-stop piles around the caisson body and casting foundation treatment piles on the underside of the caisson body. The water-stop piles block the surrounding groundwater, further reducing the impact of groundwater on the caisson body. At the same time, multiple sets of foundation treatment piles reinforce the foundation on the underside of the caisson body, improving the stability of the caisson body and preventing it from sinking. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the external structure of the caisson body of this utility model;

[0028] Figure 3 This is a schematic diagram of the internal structure of the caisson body of this utility model;

[0029] Figure 4 This is a schematic diagram of the upper structure of the first and second assembly wells of this utility model;

[0030] Figure 5 This is a schematic diagram of the lower structure of the first and second assembly wells of this utility model;

[0031] Figure 6 This is a schematic diagram of the upper structure of the third and fourth assembly wells of this utility model;

[0032] Figure 7 This is a schematic diagram of the lower structure of the third and fourth assembly wells of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Caisson body; 2. First assembly well; 21. First injection hole; 22. First locking groove; 23. Side baffle; 24. Concrete top cover; 25. Caisson opening; 3. Second assembly well; 31. First locking block; 32. First fixing bar; 33. Second injection hole; 34. Second locking groove; 4. Third assembly well; 41. Second locking block; 42. Second fixing bar; 43. Third injection hole; 44. First reserved hole; 45. First equipment pipe; 46. Second reserved hole; 47. Second equipment pipe; 48. Third locking groove; 5. Fourth assembly well; 51. Third locking block; 52. Third fixing bar; 53. Bottom sealing concrete layer; 54. Waterstop strip; 6. Concrete sealing block; 7. Waterstop pile; 8. Foundation treatment pile. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0036] This utility model provides, for example Figures 1 to 7The illustrated caisson structure includes a caisson body 1, which comprises a first assembly caisson 2, a second assembly caisson 3, a third assembly caisson 4, and a fourth assembly caisson 5. A connecting assembly is provided on the inner side of the caisson body 1. The connecting assembly includes a first injection hole 21, a first locking groove 22, a first locking block 31, a first fixing rib 32, a second injection hole 33, a second locking groove 34, a second locking block 41, a second fixing rib 42, a third injection hole 43, a third locking groove 48, a third locking block 51, and a third fixing rib 52. Concrete sealing blocks 6 are injected into the interior of the first locking groove 22, the second locking groove 34, and the third locking groove 48. Water-stop piles 7 are injected around the perimeter of the caisson body 1, and foundation treatment piles 8 are injected at the bottom of the caisson body 1.

[0037] During construction, multiple sets of foundation treatment piles 8 are first cast using high-pressure jet grouting on the underside of the caisson body 1. The characteristic value of the bearing capacity of a single pile is not less than 150kN, and the characteristic value of the bearing capacity of the composite foundation is not less than 135kPa. The foundation treatment piles 8 reinforce the foundation under the caisson body 1, improve the bearing capacity of the foundation, and enhance the stability and structural strength of the caisson body 1. At the same time, multiple sets of single-row water-stop piles 7 with a diameter of 600mm are cast using high-pressure jet grouting on the outside of the caisson body 1. The two sets of water-stop piles 7 overlap by 200mm to block the groundwater around the caisson body 1, reduce the infiltration of groundwater, and reinforce the surrounding soil to avoid affecting nearby buildings. Next, the caisson body 1 is sunk. After the sunk is completed, the bottom of the caisson body 1 is sealed. Then, trenchless pipeline construction is carried out.

[0038] In addition, the first assembly well 2, the second assembly well 3, the third assembly well 4 and the fourth assembly well 5 are all made of C30 concrete with a permeability grade of P8. The steel bars inside the first assembly well 2, the second assembly well 3, the third assembly well 4 and the fourth assembly well 5 are HPB300 grade and HRB400 grade.

[0039] See Figures 4 to 7The upper surface of the first assembly well 2 has multiple sets of first injection holes 21. A first snap-fit ​​groove 22 is opened at the lower end of the first assembly well 2, and the lower end of the first injection hole 21 communicates with the first snap-fit ​​groove 22. A first snap-fit ​​block 31 is cast into the upper end of the second assembly well 3. Multiple sets of first fixing ribs 32 are fixedly connected to the upper side of the first snap-fit ​​block 31. Multiple sets of second injection holes 33 are opened on the surface of the first snap-fit ​​block 31. A second snap-fit ​​groove 34 is opened at the lower end of the second assembly well 3, and the lower end of the second injection hole 33 communicates with the first snap-fit ​​groove 22. The two clamping grooves 34 are interconnected. The second clamping block 41 is cast at the upper end of the third assembly well 4. Multiple sets of second fixing ribs 42 are fixedly connected to the upper side of the second clamping block 41. Multiple sets of third injection holes 43 are opened on the surface of the second clamping block 41. The third clamping groove 48 is opened at the lower end of the third assembly well 4. The lower end of the third injection hole 43 is connected to the third clamping groove 48. The third clamping block 51 is cast at the upper end of the fourth assembly well 5. Multiple sets of third fixing ribs 52 are fixedly connected to the upper side of the third clamping block 51.

[0040] Specifically, during the sinking of the caisson body 1, the fourth assembly caisson 5, the third assembly caisson 4, the second assembly caisson 3, and the first assembly caisson 2 are sequentially assembled. The third assembly caisson 4 is erected above the fourth assembly caisson 5, and the third locking block 51 is locked inside the third locking groove 48. Then, the second assembly caisson 3 is erected above the third assembly caisson 4, and the second locking block 41 is locked inside the second locking groove 34. Next, the first assembly caisson 2 is erected above the second assembly caisson 3, and the first locking block 31 is locked inside the first locking groove 22. After the caisson body 1 is sunk to the designated position, it is then filled through the first injection hole 21, the second injection hole 33, and the third injection hole 43. C30 concrete is then poured into the interior of the third locking groove 48, the second locking groove 34, and the first locking groove 22, forming a concrete sealing block 6. Simultaneously, the first fixing rib 32, the second fixing rib 42, and the third fixing rib 52 are fixed inside the concrete sealing block 6, improving the connection strength between the fourth assembly well 5, the third assembly well 4, the second assembly well 3, and the first assembly well 2. Furthermore, the concrete sealing block 6 seals the interior of the third locking groove 48, the second locking groove 34, and the first locking groove 22, improving the sealing performance between these three areas.

[0041] See Figure 2 and Figure 3A side baffle 23 is poured at the outer edge of the upper end of the first assembly well 2. Two sets of concrete top covers 24 are snapped at the inner edge of the upper end of the first assembly well 2. A caisson climbing opening 25 is opened at the rear end of the right concrete top cover 24. A first reserved hole 44 is opened on the front surface of the third assembly well 4. A first equipment pipe 45 is connected inside the first reserved hole 44. Two sets of second reserved holes 46 are opened on the right side of the third assembly well 4. A second equipment pipe 47 is connected inside the second reserved hole 46. A bottom sealing concrete layer 53 is poured on the lower side of the interior of the fourth assembly well 5. A waterstop strip 54 is poured on the upper side of the bottom sealing concrete layer 53.

[0042] It should be added that the side baffle 23 and the first assembly well 2 are cast as a whole, the concrete top cover 24 overlaps the upper end of the first assembly well 2, and the gaps are sealed with C30 concrete to prevent rainwater from seeping in. At the same time, after the caisson body 1 is sunk to the designated position, it is sealed with C30 underwater concrete to form a bottom sealing concrete layer 53 at the lower end of the fourth assembly well 5. Then, a waterstop strip 54 is poured on the upper side of the bottom sealing concrete layer 53 to further improve the waterproofness of the caisson body 1. Next, the first equipment pipe 45 and the second equipment pipe 47 are constructed using trenchless technology.

[0043] The working principle of this utility model is as follows: Multiple sets of prefabricated assembly wells are spliced ​​together to improve the ease of installation. At the same time, concrete is poured into multiple sets of interlocking grooves through multiple sets of injection holes. Concrete sealing blocks 6 are used to seal the connection points of the multiple sets of assembly wells. This improves the connection strength and sealing performance of the multiple sets of assembly wells, thereby effectively improving the waterproof performance of the caisson body 1, preventing groundwater from seeping into the interior, and improving the safety of the equipment inside the caisson body 1. In addition, by pouring water-stop piles 7 around the caisson body 1 and foundation treatment piles 8 on the lower side of the caisson body 1, the water-stop piles 7 block the surrounding groundwater, further reducing the impact of groundwater on the caisson body 1. At the same time, the multiple sets of foundation treatment piles 8 reinforce the foundation on the lower side of the caisson body 1, improving the stability of the caisson body 1 and preventing the caisson body 1 from sinking.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A pipe jacking caisson structure, comprising a caisson body (1), characterized in that: The caisson body (1) includes a first assembly caisson (2), a second assembly caisson (3), a third assembly caisson (4) and a fourth assembly caisson (5). A connecting component is provided on the inner side of the caisson body (1). The connecting component includes a first injection hole (21), a first snap-fit ​​groove (22), a first snap-fit ​​block (31), a first fixing rib (32), a second injection hole (33), a second snap-fit ​​groove (34), a second snap-fit ​​block (41), a second fixing rib (42), a third injection hole (43), a third snap-fit ​​groove (48), a third snap-fit ​​block (51), and a third fixing rib (52). Concrete sealing blocks (6) are injected into the interior of the first snap-fit ​​groove (22), the second snap-fit ​​groove (34) and the third snap-fit ​​groove (48).

2. The caisson structure according to claim 1, characterized in that: The upper surface of the first assembly well (2) is provided with multiple sets of first injection holes (21), and the first snap-fit ​​groove (22) is provided at the lower end of the first assembly well (2). The lower end of the first injection hole (21) is connected to the first snap-fit ​​groove (22).

3. The caisson structure according to claim 1, characterized in that: The first snap-fit ​​block (31) is cast at the upper end of the second assembly well (3). Multiple sets of first fixing ribs (32) are fixedly connected to the upper side of the first snap-fit ​​block (31). Multiple sets of second injection holes (33) are opened on the surface of the first snap-fit ​​block (31). The second snap-fit ​​groove (34) is opened at the lower end of the second assembly well (3). The lower end of the second injection hole (33) is connected to the second snap-fit ​​groove (34).

4. The caisson structure according to claim 1, characterized in that: The second snap-fit ​​block (41) is cast on the upper end of the third assembly well (4). Multiple sets of second fixing ribs (42) are fixedly connected to the upper side of the second snap-fit ​​block (41). Multiple sets of third injection holes (43) are opened on the surface of the second snap-fit ​​block (41). The third snap-fit ​​groove (48) is opened at the lower end of the third assembly well (4). The lower end of the third injection hole (43) is connected to the third snap-fit ​​groove (48).

5. A caisson structure according to claim 1, characterized in that: The third snap-fit ​​block (51) is cast on the upper end of the fourth assembly well (5). Multiple sets of third fixing bars (52) are fixedly connected to the upper side of the third snap-fit ​​block (51). A bottom sealing concrete layer (53) is cast on the lower side inside the fourth assembly well (5). A waterstop strip (54) is cast on the upper side of the bottom sealing concrete layer (53).

6. The caisson structure according to claim 1, characterized in that: A side baffle (23) is poured at the outer edge of the upper end of the first assembly well (2), and two sets of concrete top covers (24) are snapped at the inner edge of the upper end of the first assembly well (2). A caisson climbing opening (25) is opened at the rear end of the concrete top cover (24) on the right side.

7. A pipe jacking caisson structure according to claim 1, characterized in that: The front surface of the third assembly well (4) is provided with a first reserved hole (44), and the first reserved hole (44) is connected to a first equipment pipe (45). The right side of the third assembly well (4) is provided with two sets of second reserved holes (46), and the second reserved holes (46) are connected to a second equipment pipe (47).

8. A caisson structure according to claim 1, characterized in that: Water-stopping piles (7) are poured around the caisson body (1), and foundation treatment piles (8) are poured at the bottom of the caisson body (1).

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