A connecting structure, a precast pile and a cutoff wall groove wall reinforcing system

Abstract

The utility model discloses a connecting structure, precast pile and seepage prevention wall groove wall reinforcing system relates to ground foundation reinforcing technical field. The connecting structure includes male head spare and female head spare: the male head spare contains first sleeve, axle stem, locking sleeve and T type head, and axle stem can rotate relative to first sleeve, and locking sleeve restricts its axial movement, and the female head spare contains second sleeve, inner positioning axle and outer positioning sleeve, and outer positioning sleeve is equipped with rectangular hole, and T type head is locked after the rotation of the perforation, and the positioning screw reinforcement is established between axle stem and locking sleeve. The precast pile is axially spliced by a plurality of pile body units through above connecting structure. The seepage prevention wall groove wall reinforcing system is equipped with precast pile between the both sides of groove wall at intervals, can balance the lateral pressure of groove wall, adapts complex geology, and the construction is convenient and environmental protection, solves the stability and economic insufficiency problem of existing mud wall, steel sheet pile.

Description

Technical Field

[0001] This utility model relates to the field of foundation reinforcement technology, specifically to a connection structure, precast piles, and anti-seepage wall trench reinforcement system. Background Technology

[0002] In the construction of anti-seepage walls, "trenching" is a key process, which requires mechanical excavation to form a continuous trench-shaped space, and then pouring concrete or anti-seepage materials into the trench to form the wall.

[0003] Currently, trenching for seepage prevention walls is mostly carried out using techniques such as hydraulic grab trenching, impact drilling, or milling. However, trenching operations are constrained by complex geological conditions and construction environments. When constructing in soft soil or gravel strata, the risk of trench wall instability increases significantly. This is because soft soil and gravel strata have low cohesion and weak shear strength, and the lateral pressure imbalance of the trench wall during trenching can easily lead to collapse.

[0004] To address the issue of trench wall collapse, existing technologies primarily employ solutions such as mud slurry wall protection and sheet pile support. Mud slurry wall protection relies on a mud cake formed by the mud to balance the pressure on the trench walls. However, in strata with high sand and gravel content and high permeability, the mud is prone to loss, the mud cake formation is ineffective, and the stability of the wall protection is difficult to guarantee. While sheet pile support offers strong resistance to lateral displacement, its construction costs are high, and problems such as pile deformation are prone to occur during deep trench construction.

[0005] In summary, existing anti-seepage wall reinforcement technologies still have shortcomings in terms of adaptability, stability, and economy. Therefore, developing a precast pile structure with reliable structure, strong adaptability, convenient construction, and reasonable cost, along with a matching anti-seepage wall reinforcement system, has become an urgent need to promote the upgrading of anti-seepage wall construction technology and ensure project safety. Utility Model Content To solve the above-mentioned technical problems, this utility model proposes a precast pile structure and a seepage prevention wall reinforcement system.

[0006] The technical solution to the technical problem solved by this utility model is as follows: Firstly, this technical solution proposes a connection structure, including a male connector and a female connector detachably connected to the male connector, wherein: The male head includes a first sleeve, a shaft, and a locking sleeve. One end of the shaft is inserted into the first sleeve and can rotate relative to the first sleeve. A locking sleeve for restricting the axial movement of the shaft is sleeved on the shaft, and the locking sleeve is threadedly connected to the first sleeve. A T-head is fixedly connected to the other end of the shaft. The T-head includes a rod and a head connected to one end of the rod. The female head component includes a second sleeve, an inner positioning shaft, and an outer positioning sleeve. The inner positioning shaft is built into the second sleeve and threadedly connected to the second sleeve. The outer positioning sleeve is threadedly connected to the end of the second sleeve. The outer positioning sleeve has a rectangular hole, and a gap is left between the outer positioning sleeve and the inner positioning shaft to form a rotation space for the head to rotate. The head can pass through the rectangular hole and enter the rotation space, and when the head rotates, it can be misaligned with the rectangular hole. A positioning screw for positioning the shaft is also connected between the shaft and the locking sleeve.

[0007] Preferably, the first sleeve has a first through hole; the second sleeve has a second through hole, and the first through hole and the second through hole are coaxially arranged.

[0008] Preferably, one end of the shaft is provided with a first insertion hole, and one end of the inner positioning shaft is provided with a second insertion hole corresponding to the first insertion hole.

[0009] Preferably, the shaft has a locking hole, and the locking sleeve has a screw hole, with the screw hole engaging with the positioning screw in the locking hole.

[0010] Preferably, the outer wall of the shaft has a flange, the flange forming a shoulder relative to the shaft, and one end of the locking sleeve is positioned at the end face of the shoulder.

[0011] Secondly, this technical solution proposes a precast pile, comprising several axially connected pile units, with adjacent pile units connected by the aforementioned connection structure.

[0012] Preferably, the pile unit is provided with a reinforcing cage, the reinforcing cage includes a plurality of circumferentially arranged vertical bars, the vertical bars are connected with stirrups, one end of the vertical bar is fixedly connected to the male end piece, and the other end is fixedly connected to the female end piece.

[0013] Preferably, the pile unit has a threaded sleeve pre-embedded at least at the end located on the male end.

[0014] Preferably, it also includes a pile tip, which is bolted to the bottommost pile unit; the pile tip has a central hole in which a threaded rod is inserted, and one end of the threaded rod is threadedly connected to the threaded sleeve.

[0015] Thirdly, this technical solution also proposes a seepage-proof wall trench reinforcement system, in which several precast piles are installed at intervals on both sides of the seepage-proof wall trench.

[0016] The above technical solution has the following advantages or beneficial effects: 1. The connection structure designed in this scheme has the advantages of being stable and reliable. The male head is axially limited by the cooperation of the shaft and locking sleeve. The T-head can be inserted through the rectangular hole of the female head and then rotated to lock. The shaft is further positioned by the positioning screw, so that the adjacent pile units are tightly connected, improving the overall structural integrity and mechanical transmission efficiency of the precast pile.

[0017] 2. The precast piles adopt a modular assembly design. Adjacent pile units can be quickly connected through standardized male and female connectors. Only T-head insertion, rotation locking and positioning screw installation are required to achieve splicing, which greatly simplifies the operation process and improves on-site work efficiency.

[0018] 3. The pile unit can be prefabricated in the factory in advance. The connection between the vertical bars of the steel cage and the male and female connectors is completed in the factory in a standardized manner, which not only ensures the processing accuracy, but also reduces the labor and time costs of on-site construction. The connection structure uses conventional metal components, the materials are easy to obtain and the cost is controllable, which can significantly reduce the total cost of the project compared with the steel sheet pile support scheme.

[0019] 4. By intermittently arranging precast piles on both sides of the trench wall, bidirectional support is formed from the outside of the trench wall. The structural strength of the precast piles themselves offsets the lateral pressure on the trench wall, effectively addressing the collapse problem caused by low cohesion and weak shear strength in soft soil and gravel strata, thus reducing the risk of trench wall instability. Furthermore, the spacing between the precast piles and the trench wall can be flexibly adjusted, allowing for optimization of pile spacing based on trench depth and stratum characteristics, further enhancing the targeted and stable reinforcement effect. Attached Figure Description

[0020] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0021] Figure 1 This is a cross-sectional view of the assembled connection structure proposed in this utility model.

[0022] Figure 2 yes Figure 1 The structural cross-sectional view of the male and female connectors after they are separated in the connection structure.

[0023] Figure 3 yes Figure 1 An exploded view of Zhonggong Headpiece.

[0024] Figure 4 yes Figure 1 Exploded view of the motherboard assembly.

[0025] Figure 5 This is a three-dimensional view of the precast pile unit in this utility model.

[0026] Figure 6 This is a schematic diagram of the precast pile structure formed after the precast pile units are assembled.

[0027] Figure 7 yes Figure 6 A cross-sectional view of the structure along the AA direction.

[0028] Figure 8 yes Figure 5 A bottom view of a precast pile unit.

[0029] Figure 9 This is a top view of the anti-seepage wall trench reinforcement system proposed in this utility model.

[0030] Figure 10 This is a cross-sectional view of the anti-seepage wall trench reinforcement system proposed in this utility model from the frontal view.

[0031] Explanation of reference numerals in the attached figures: 1. Male connector; 11. First sleeve; 12. First through hole; 13. Shaft; 14. Flange; 15. Hex nut; 16. Locking sleeve; 161. Screw hole; 17. Positioning screw; 18. T-head; 131. First insertion hole; 132. Locking hole; 2. Female head; 21. Second sleeve; 22. Inner positioning shaft; 221. Second insertion hole; 222. Hexagonal inner hole; 23. Outer positioning sleeve; 231. Rectangular hole; 24. Rotation space; 3. Pile unit; 31. Vertical reinforcement; 32. Threaded sleeve; 4. Pile tip; 41. Threaded rod; 5. Anti-seepage wall trench. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] Example 1: like Figure 1 - Figure 4 As shown, this embodiment proposes a connection structure, including a male connector 1 and a female connector 2 detachably connected to the male connector 1, wherein: The male connector 1 includes a first sleeve 11, a shaft 13, and a locking sleeve 16. One end of the shaft 13 is inserted into the first sleeve 11 and can rotate relative to the first sleeve 11. The upper end of the shaft 13 is positioned and fitted against the upper inner end of the first sleeve 11. A locking sleeve 16 is fitted on the shaft 13 to restrict its axial movement. The locking sleeve 16 has a mounting hole through which the shaft 13 can pass. The diameter of the mounting hole is slightly larger than the outer diameter of the shaft 13. The locking sleeve 16 is threaded to the first sleeve 11 and is installed using a detachable assembly method. A T-head 18 is fixedly connected to the other end of the shaft 13. The T-head 18 includes a rod and a head connected to one end of the rod. The head is a rectangular block, and the rod is a cylindrical structure. The T-head is fixed by welding or integral forging to ensure lossless force transmission.

[0034] The locking sleeve 16 can effectively limit the axial movement of the shaft 13, ensuring that the shaft 13 always remains in the preset installation position when under force, and preventing the connection from becoming loose.

[0035] The female head component 2 includes a second sleeve 21, an inner positioning shaft 22, and an outer positioning sleeve 23. The inner positioning shaft 22 is built into the second sleeve 21 and threadedly connected to the second sleeve 21, forming a concealed design. The outer positioning sleeve 23 is threadedly connected to the end of the second sleeve 21. The outer positioning sleeve 23 has a rectangular hole 231, and there is a gap between the outer positioning sleeve 23 and the inner positioning shaft 22 to form a rotation space 24 for the head to rotate. The head can pass through the rectangular hole 231 and enter the rotation space 24. When the head rotates, it can be misaligned with the rectangular hole 231, thereby completing the locking connection between the male head component 1 and the female head component 2.

[0036] In this embodiment, for ease of operation, the inner positioning shaft 22 is provided with an inner hexagonal hole 222.

[0037] The rectangular head can penetrate the rectangular hole 231 of the outer positioning sleeve 23 in a specific direction. After entering the rotation space 24, the shaft 13 only needs to be rotated by a certain angle (such as 90°) so that the rectangular head can be misaligned with the rectangular hole 231. At this time, the head is blocked by the inner wall of the outer positioning sleeve 23 and cannot pass through the rectangular hole 231 in the opposite direction, thereby achieving the initial mechanical locking of the male head 1 and the female head 2.

[0038] To prevent the shaft 13 from rotating in the opposite direction due to external vibration or force after the T-head is rotated and locked, thus causing locking failure, a positioning screw 17 is added between the shaft 13 and the locking sleeve 16. Specifically, a positioning screw 17 for positioning the shaft 13 is also connected between the shaft 13 and the locking sleeve 16. The positioning screw 17 is used to achieve the locking connection between the shaft 13 and the locking sleeve 16, which is convenient to operate.

[0039] In this embodiment, a hexagonal nut 15 is connected to the outer wall of the shaft 13 to facilitate rotation of the shaft 13.

[0040] In this embodiment, the cross-sectional shape of the first sleeve 11 and the second sleeve 21 is an n-shaped structure. The first sleeve 11 is provided with a first through hole 12; the second sleeve 21 is provided with a second through hole, and the first through hole 12 and the second through hole are coaxially arranged.

[0041] One end of the shaft 13 is provided with a first insertion hole 131, and one end of the inner positioning shaft 22 is provided with a second insertion hole 221 corresponding to the first insertion hole 131. The first insertion hole 131, the first through hole 12, the second insertion hole 221, and the second through hole are all arranged coaxially, which facilitates insertion and fixing with the vertical reinforcement 31 of the reinforcing cage. This design ensures that when the male and female connectors 2 are connected, the central axes of each component are completely coincident, avoiding local stress concentration caused by eccentricity and extending the service life of the connection structure.

[0042] The specific installation method for positioning screw 17 is as follows: The shaft 13 has a locking hole 132, and the locking sleeve 16 has a screw hole 161. The screw hole 161 and the locking hole 132 are fitted with a positioning screw 17. Specifically, the side wall of the shaft 13 has a radial locking hole 132 corresponding to the installation position of the locking sleeve 16, and the side wall of the locking sleeve 16 has a screw hole 161 with internal threads. When the T-head is rotated to the locking position, the positioning screw 17 is passed through the screw hole 161 of the locking sleeve 16 and screwed into the locking hole 132 of the shaft 13, thus fixing the shaft 13 and the locking sleeve 16. This not only restricts the rotational freedom of the shaft 13, but also further enhances the axial limiting effect of the locking sleeve 16 on the shaft 13. Moreover, the screw installation and removal can be done with just a conventional wrench, making construction very convenient.

[0043] In this embodiment, in order to facilitate the installation of the locking sleeve 16, the outer wall of the shaft 13 has a flange 14. The diameter of the flange 14 is slightly smaller than the inner diameter of the first sleeve 11. The flange 14 forms a shoulder relative to the shaft 13. One end of the locking sleeve 16 is positioned at the end face of the shoulder so as to achieve axial positioning of the shaft 13.

[0044] Application results: The connection structure designed in this scheme has the advantages of being stable and reliable. The male head 1 achieves axial positioning through the cooperation of the shaft 13 and the locking sleeve 16. The T-head can pass through the rectangular hole 231 of the female head 2 and then rotate to lock. Combined with the positioning screw 17, the shaft 13 is further positioned, so that the adjacent pile units 3 are tightly connected, improving the overall structural integrity and mechanical transmission efficiency of the precast pile.

[0045] Example 2: like Figure 5 - Figure 8As shown, this embodiment proposes a precast pile, comprising several axially connected pile units 3, with adjacent pile units 3 connected by the aforementioned connection structure. The precast pile of this embodiment adopts a modular splicing design, consisting of several standardized pile units 3 connected in series axially. Adjacent pile units 3 are removably and stably connected by the aforementioned male-female connector 1-female connector 2 connection structure.

[0046] Specifically, the pile unit 3 is equipped with a reinforcing cage, which includes several circumferentially arranged vertical bars 31. Stirrups are connected to the vertical bars 31. One end of each vertical bar 31 is fixedly connected to the male connector 1, and the other end is fixedly connected to the female connector 2. The vertical bars 31 are respectively inserted into the first sleeve 11 and the second sleeve 21 and then welded to fix them.

[0047] In this embodiment, the pile unit 3 can be formed by casting C30-C40 commercial concrete, and the pile unit 3 can use recycled construction waste aggregate to replace part of the natural aggregate, which meets the needs of green building development.

[0048] In some embodiments, the pile unit 3 has a threaded sleeve 32 pre-embedded at least at the end located on the male end 1. During pre-embedding, the threaded sleeve 32 is first welded and fixed to the peripheral vertical bars 31 of the reinforcing cage, with no less than two weld points, to ensure that the threaded sleeve 32 will not shift due to vibration during concrete pouring; at the same time, a plastic protective plug is inserted into the threaded sleeve 32 to prevent concrete slurry from entering the threaded hole and causing blockage. The protective plug can be removed when connecting the pile tip 4 later. The operation is convenient and can ensure the thread accuracy.

[0049] In some embodiments, the pile tip 4 is further included, which is bolted to the bottommost pile unit 3. The pile tip 4 has a central hole in which a threaded rod 41 is inserted. One end of the threaded rod 41 is threadedly connected to the threaded sleeve 32. The pile tip 4 is made of cast steel or C40 high-strength concrete and is conical in shape. The diameter of the pile tip 4 is the same as the diameter of the pile unit 3 to ensure that the force transmission is eccentric.

[0050] Application results: Firstly, the precast piles adopt a modular assembly design. Adjacent pile units 3 can be quickly connected through standardized male head parts 1 and female head parts 2. Only T-head insertion, rotation locking and installation of positioning screws 17 are required to achieve splicing, which greatly simplifies the operation process and improves on-site operation efficiency.

[0051] Secondly, the pile unit 3 can be prefabricated in the factory in advance. The connection between the vertical bars 31 of the steel cage and the male head 1 and female head 2 is completed in the factory in a standardized manner, which not only ensures the processing accuracy, but also reduces the labor and time costs of on-site construction. The connection structure uses conventional metal components, the materials are easy to obtain and the cost is controllable, which can significantly reduce the total cost of the project compared with the steel sheet pile support scheme.

[0052] Example 3: like Figure 9 - Figure 10 As shown, this embodiment also proposes a wall reinforcement system for the anti-seepage wall trench 5, in which several precast piles are installed at intervals on both sides of the anti-seepage wall trench 5. The precast piles are strictly arranged on both sides of the anti-seepage wall trench 5 to form a two-way clamping protection for the trench wall.

[0053] Construction process of precast piles: 1. Measurement and positioning: Based on the design axis of anti-seepage wall trench 5, use a total station to mark the pile positions of precast piles to ensure that the pile position deviation is ≤ ±50mm; at the same time, in conjunction with the geological survey report, confirm the stratum conditions at the pile position and formulate a pile driving response plan in advance.

[0054] 2. Site preparation and equipment debugging: Level the construction site, remove obstacles around the pile positions, and ensure that the pile driving equipment can be moved smoothly.

[0055] 3. On-site assembly: Axial assembly of pile unit 3 3.1 Pile Unit 3 Splicing: The first pile unit 3 is hoisted to the pile position using hoisting equipment and adjusted to a vertical position; then the second pile unit 3 is hoisted, so that the T-shaped head of the male head 1 of the pile unit 3 is aligned with the rectangular hole 231 of the outer positioning sleeve 23 of the female head 2 of the first pile unit 3.

[0056] 3.2 Locking Connection: Insertion and rotation: Insert the T-head along the long side of the rectangular hole 231 and enter the rotation space 24 between the outer positioning sleeve 23 and the inner positioning shaft 22. Rotate the shaft 13 90° clockwise or counterclockwise to make the head of the T-head misaligned with the rectangular hole 231, thus completing the initial mechanical locking. Fixing with positioning screw 17: Pass positioning screw 17 through the screw hole 161 of locking sleeve 16 and screw it into the locking hole 132 of shaft 13 to achieve rigid fixation between shaft 13 and locking sleeve 16, preventing T-head from rotating in the opposite direction and loosening.

[0057] 3.3 Multi-unit splicing repetition: Follow the steps described above to sequentially assemble the subsequent pile units 3 until the total length of the precast piles reaches the design requirements.

[0058] 4. Installation of pile tip 4: The pile tip 4 is bolted to the bottom pile unit 3 to ensure smooth pile sinking.

[0059] 5. Pile operation: Select the pile driving method according to the geological characteristics to ensure that the pile body is driven into the soil to the designed depth and to ensure that the precast piles are in place.

[0060] Application results: By intermittently arranging precast piles on both sides of the anti-seepage wall trench 5, bidirectional support is formed from the outside of the trench 5. The structural strength of the precast piles themselves offsets the lateral pressure on the trench wall, specifically addressing the collapse problem caused by low cohesion and weak shear strength in soft soil and gravel strata, thus reducing the risk of trench wall instability. Furthermore, the spacing between the precast piles and the trench wall can be flexibly adjusted, optimizing the pile spacing according to the trench wall depth and stratum characteristics, further enhancing the targetedness and stability of the reinforcement effect.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] Although the specific embodiments of the utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the utility model. Based on the technical solution of the utility model, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the utility model.

Claims

1. A connection structure comprising a male connector (1) and a female connector (2) detachably connected to the male connector (1), characterized in that: The male head (1) includes a first sleeve (11), a shaft (13), and a locking sleeve (16). One end of the shaft (13) is inserted into the first sleeve (11) and the shaft (13) can rotate relative to the first sleeve (11). A locking sleeve (16) for restricting the axial movement of the shaft (13) is sleeved on the shaft (13). The locking sleeve (16) is threadedly connected to the first sleeve (11). A T-head (18) is fixedly connected to the other end of the shaft (13). The T-head (18) includes a rod and a head connected to one end of the rod. The female head component (2) includes a second sleeve (21), an inner positioning shaft (22), and an outer positioning sleeve (23). The inner positioning shaft (22) is built into the second sleeve (21) and threadedly connected to the second sleeve (21). The outer positioning sleeve (23) is threadedly connected to the end of the second sleeve (21). The outer positioning sleeve (23) has a rectangular hole (231), and there is a gap between the outer positioning sleeve (23) and the inner positioning shaft (22) to form a rotation space (24) for the head to rotate. The head can pass through the rectangular hole (231) and enter the rotation space (24). When the head rotates, it can be misaligned with the rectangular hole (231). A positioning screw (17) for positioning the shaft (13) is also connected between the shaft (13) and the locking sleeve (16).

2. The connection structure according to claim 1, characterized in that: The first sleeve (11) has a first through hole (12); the second sleeve (21) has a second through hole, and the first through hole (12) and the second through hole are coaxially arranged.

3. The connection structure according to claim 1, characterized in that: The shaft (13) has a first insertion hole (131) at one end, and the inner positioning shaft (22) has a second insertion hole (221) at one end corresponding to the first insertion hole (131).

4. The connection structure according to claim 1, characterized in that: The shaft (13) has a locking hole (132), and the locking sleeve (16) has a screw hole (161). The screw hole (161) and the locking hole (132) are connected to the positioning screw (17).

5. The connection structure according to claim 1, characterized in that: The outer wall of the shaft (13) has a flange (14), which forms a shoulder relative to the shaft (13), and one end of the locking sleeve (16) is positioned at the end face of the shoulder.

6. A precast pile, comprising a plurality of axially connected pile units (3), characterized in that: The adjacent pile units (3) are connected by the connection structure described in any one of claims 1-5.

7. A precast pile according to claim 6, characterized in that: The pile unit (3) is provided with a steel cage, which includes several circumferentially arranged vertical bars (31). The vertical bars (31) are connected with stirrups. One end of the vertical bar (31) is fixedly connected to the male head (1), and the other end is fixedly connected to the female head (2).

8. A precast pile according to claim 6, characterized in that: The pile unit (3) has a threaded sleeve (32) pre-embedded at least at the end located on the male end (1).

9. A precast pile according to claim 8, characterized in that: It also includes a pile tip (4), which is bolted to the bottom pile body unit (3); the pile tip (4) has a central hole, in which a threaded rod (41) is inserted, and one end of the threaded rod (41) is threadedly connected to the threaded sleeve (32).

10. A seepage-proof wall trench reinforcement system, characterized in that: Several precast piles as described in any one of claims 6-9 are installed at intervals on both sides of the anti-seepage wall trench.

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