A leak-proof structure for the joint of bored cast-in-place piles for foundation pit retaining

Abstract

The present invention discloses a leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining, which includes a connecting pipe, a connecting tube and a buffer mechanism. A first pipe sleeve is fixedly sleeved on the side wall of the connecting tube, and four straight cylinders are symmetrically and fixedly connected to the inner wall of the first pipe sleeve. A threaded rod is rotatably connected to the inner wall of each straight cylinder. In the present invention, through the cooperation of the slider, the telescopic rod and the return spring, the bolt can be driven to insert into the limiting groove. Through the cooperation of the bolt and the limiting groove, the disc can be limited, so that the vertical rod can be prevented from rotating, thereby preventing the device from loosening, improving the sealing effect of the device, and preventing the phenomenon of concrete leakage at the joint; through the cooperation of the second pipe sleeve, the sliding rod and the buffer spring, the device can be buffered, preventing the joint of the connecting pipe and the connecting tube from being misaligned due to the external sediment pressure, and further preventing the phenomenon of concrete leakage at the joint of the connecting pipe and the connecting tube.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-leakage of the joints of cast-in-place piles in foundation pits, and particularly relates to an anti-leakage structure for the joints of bored cast-in-place piles for foundation pit retaining. Background Art

[0002] Bored cast-in-place piles are a type of pile foundation that is currently widely used. They have a high degree of mechanization, large single-pile bearing capacity, and strong pile body stiffness. Existing cast-in-place piles usually consist of multiple main cage longitudinal bars and multiple stirrups surrounding the outer periphery of the main cage longitudinal bars. In karst areas, due to the existence of karst caves, it will have a significant impact on pile foundation construction. When encountering a karst cave during the drilling construction process, a casing is often used as a good retaining wall. However, often in the process of pouring underwater concrete, due to excessive pressure, leakage of concrete occurs at the joint of the casing, resulting in a large amount of material loss and even causing pile breakage accidents.

[0003] In response to the above problems, a patent with the publication number CN216809864U discloses an anti-leakage structure for the joints of bored cast-in-place piles for foundation pit retaining, including a connecting pipe and a connecting tube. A fixing ring is fixed on the circumferential side of the connecting pipe...... Through the design of the connecting pipe, connecting tube, flange, protective tube, casing and collar, the fastening bolt and the flange cooperate to complete the connection and installation of the connecting pipe and the connecting tube. At the same time, the first annular sealing strip of the casing and the second annular sealing strip of the collar are both closely attached to the circumferential side of the connecting tube, preventing leakage of concrete at the joint of the connecting pipe and the connecting tube, and improving the safety of the bored cast-in-place pile.

[0004] In the above technology, the connecting tube and the connecting pipe are fixedly installed by fastening bolts. However, under the extrusion force of the external soil for a long time, the bolts are prone to loosen, resulting in a reduction in the sealing effect of the device, and thus leakage of concrete occurs at the joint.

[0005] In response to the above problems, we propose an anti-leakage structure for the joints of bored cast-in-place piles for foundation pit retaining. Summary of the Invention

[0006] The purpose of the present invention is to solve the defect in the prior art that "in the above technology, the connecting tube and the connecting pipe are fixedly installed by fastening bolts. However, under the extrusion force of the external soil for a long time, the bolts are prone to loosen, resulting in a reduction in the sealing effect of the device, and thus leakage of concrete occurs at the joint", and thus propose an anti-leakage structure for the joints of bored cast-in-place piles for foundation pit retaining.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A leak-proof structure for the joint of bored cast-in-place piles for foundation pit retaining, comprising a connecting pipe, a connecting tube and a buffer mechanism. A first pipe sleeve is fixedly sleeved on the side wall of the connecting tube. Four straight tubes are symmetrically and fixedly connected to the inner wall of the first pipe sleeve. A threaded rod is rotatably connected to the inner wall of each straight tube. A threaded sleeve is meshed and connected to each threaded rod. A push plate is fixedly connected to the opposite side of each threaded sleeve. A push rod is fixedly connected to the lower end surface of each push plate. The lower end of each push rod penetrates through the lower end surface of the straight tube and is rotatably connected to a clamping plate. A clamping block is fixedly connected to the upper end surface of each clamping plate. A first annular mounting plate is fixedly sleeved on the side wall of the connecting tube. A second annular mounting plate is fixedly sleeved on the side wall of the connecting pipe. Sealing rings are fixedly connected to the opposite ends of the first annular mounting plate and the second annular mounting plate. A vertical rod is fixedly connected to the upper end of each threaded rod. The upper end of each vertical rod penetrates through the upper end surfaces of the straight tube and the first pipe sleeve and is fixedly connected to a knob. A disc is fixedly sleeved on each vertical rod. Four cross plates are symmetrically and fixedly connected to the side wall of the connecting tube. A sliding groove is formed in the upper end surface of each cross plate. A slider is slidably connected in each sliding groove. A plug is fixedly connected to the opposite side of each slider. A plurality of limiting grooves are symmetrically and equally spaced on the side wall of each disc. The opposite end of each plug penetrates through the sliding groove and abuts in the limiting groove.

[0009] Preferably, the buffer mechanism includes a second pipe sleeve fixedly sleeved on the first pipe sleeve. Four fixed cylinders are symmetrically and fixedly connected to the side wall of the first pipe sleeve. A plurality of sliding rods are symmetrically and fixedly connected to the inner wall of the second pipe sleeve. The other end of each sliding rod penetrates through the side wall of the fixed cylinder and is fixedly connected to a fixing plate.

[0010] Preferably, telescopic rods are fixedly connected in a plurality of the sliding grooves. The telescopic end of each telescopic rod is fixedly connected to the side wall of the slider. A return spring is sleeved on each telescopic rod. The two ends of each return spring are respectively fixedly connected to the side wall of the slider and the inner wall of the sliding groove. A connecting rod is rotatably connected to the upper end surface of each slider. The other end of each connecting rod is rotatably connected to a short rod.

[0011] Preferably, four fixing blocks are symmetrically and fixedly connected to the inner wall of the first pipe sleeve. A positioning groove is formed in the opposite side of each fixing block. A limiting rod is fixedly connected to the opposite side of a plurality of the clamping plates. The other end of each limiting rod is slidably connected in the positioning groove.

[0012] Preferably, a plurality of the sliding rods are slidably connected in the inner wall of the fixed cylinder. A buffer spring is sleeved on each sliding rod. The two ends of each buffer spring are respectively fixedly connected to the inner wall of the second pipe sleeve and the side wall of the fixed cylinder.

[0013] Preferably, the upper ends of the four short rods all penetrate through the upper end surface of the first sleeve and are fixedly connected with a pull plate. Each short rod is slidably connected in the inner wall of the first sleeve, and multiple pins are slidably connected in the inner wall of the cross plate.

[0014] Preferably, the four push rods are all slidably connected in the inner wall of the straight cylinder. The four vertical rods are all rotatably connected in the inner walls of the straight cylinder and the first sleeve, and the opposite ends of the connecting pipe and the connecting tube abut against each other.

[0015] Preferably, the upper end surface of each clamping plate abuts against, and four clamping grooves are symmetrically formed in the lower end surface of the first annular mounting plate. The upper end surface of each clamping block abuts against the clamping groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Through the cooperation of the vertical rod, the threaded rod and the threaded sleeve, the push plate can be driven to move upward. The push plate can drive the clamping plate to move upward through the push rod. The clamping plate can press the first annular mounting plate, so that the first annular mounting plate is closely attached to the second annular mounting plate, thereby limiting and fixing the connecting pipe and the connecting tube. Moreover, the connecting seam of the connecting tube and the connecting pipe can be sealed through the sealing ring, increasing the sealing performance of the device;

[0018] 2. Through the cooperation of the slider, the telescopic rod and the return spring, the pin can be driven to insert into the limiting groove. Through the cooperation of the pin and the limiting groove, the disc can be limited, thereby preventing the vertical rod from rotating, preventing the device from loosening, improving the sealing effect of the device, and preventing the phenomenon of concrete leakage at the connecting seam;

[0019] 3. Through the cooperation of the second sleeve, the sliding rod and the buffer spring, the device can play a buffering role, preventing the connecting seam of the connecting tube and the connecting pipe from being displaced due to the external sediment pressure, and further preventing the phenomenon of concrete leakage at the connecting seam of the connecting tube and the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front sectional structure schematic diagram of a leakage prevention structure for the joint of a bored cast-in-place pile for foundation pit enclosure proposed by the present invention;

[0021] Figure 2 Proposed by the present invention Figure 1 The enlarged structure schematic diagram at A1 in;

[0022] Figure 3 Proposed by the present invention Figure 1 The enlarged structure schematic diagram at A2 in;

[0023] Figure 4 Proposed by the present invention Figure 1 The enlarged structure schematic diagram at A3 in;

[0024] Figure 5 A schematic diagram of the three-dimensional structure of a disc in a foundation pit retaining bored pile joint leakage prevention structure proposed by the present invention;

[0025] In the figure: 1 connecting pipe, 2 connecting pipe, 3 first pipe sleeve, 4 straight tube, 5 threaded rod, 6 threaded sleeve, 7 push plate, 8 push rod, 9 clamping plate, 10 clamping block, 11 first annular mounting plate, 12 second annular mounting plate, 13 limit plate, 14 fixed block, 15 limit rod, 16 vertical rod, 17 disk, 18 horizontal plate, 19 slider, 20 telescopic rod, 21 return spring, 22 latch, 23 connecting rod, 24 short rod, 25 pull plate, 26 second pipe sleeve, 27 fixed tube, 28 slide rod, 29 fixed plate, 30 buffer spring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Reference Figures 1-5, a leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining, including a connecting pipe 1, a connecting tube 2 and a buffer mechanism. A first pipe sleeve 3 is fixedly sleeved on the side wall of the connecting tube 2. Four straight tubes 4 are symmetrically and fixedly connected to the inner wall of the first pipe sleeve 3. A threaded rod 5 is rotatably connected to the inner wall of each straight tube 4. A threaded sleeve 6 is engaged with each threaded rod 5. A push plate 7 is fixedly connected to the opposite side of each threaded sleeve 6. A push rod 8 is fixedly connected to the lower end surface of each push plate 7. The lower end of each push rod 8 penetrates through the lower end surface of the straight tube 4 and is rotatably connected to a clamping plate 9. A clamping block 10 is fixedly connected to the upper end surface of each clamping plate 9. A first annular mounting plate 11 is fixedly sleeved on the side wall of the connecting tube 2. A second annular mounting plate 12 is fixedly sleeved on the side wall of the connecting pipe 1. Sealing rings are fixedly connected to the opposite ends of the first annular mounting plate 11 and the second annular mounting plate 12. A vertical rod 16 is fixedly connected to the upper end of each threaded rod 5. The upper end of each vertical rod 16 penetrates through the upper end surfaces of the straight tube 4 and the first pipe sleeve 3 and is fixedly connected to a knob. A disc 17 is fixedly sleeved on each vertical rod 16. Four cross plates 18 are symmetrically and fixedly connected to the side wall of the connecting tube 2. A chute is opened on the upper end surface of each cross plate 18. A slider 19 is slidably connected in each chute. A bolt 22 is fixedly connected to the opposite side of each slider 19. A plurality of limiting grooves are symmetrically and equally spaced on the side wall of each disc 17. The opposite end of each bolt 22 penetrates through the chute and abuts in the limiting groove. Through the cooperation of the vertical rod 16, the threaded rod 5 and the threaded sleeve 6, the push plate 7 can be driven to move upward. The push plate 7 can drive the clamping plate 9 to move upward through the push rod 8. The clamping plate 9 can press the first annular mounting plate 11, so that the first annular mounting plate 11 is closely attached to the second annular mounting plate 12, thereby limiting and fixing the connecting tube 2 and the connecting pipe 1. Moreover, the connection seam between the connecting pipe 1 and the connecting tube 2 can be sealed through the sealing ring, increasing the sealing performance of the device.

[0029] Among them, the buffer mechanism includes a second pipe sleeve 26. The second pipe sleeve 26 is fixedly sleeved on the first pipe sleeve 3. Four fixed cylinders 27 are symmetrically and fixedly connected to the side wall of the first pipe sleeve 3. A plurality of sliding rods 28 are symmetrically and fixedly connected to the inner wall of the second pipe sleeve 26. The other end of each sliding rod 28 penetrates through the side wall of the fixed cylinder 27 and is fixedly connected to a fixing plate 29. The fixing plate 29 can play a role in limiting the sliding rod 28.

[0030] Among them, telescopic rods 20 are fixedly connected in multiple sliding grooves. The telescopic ends of each telescopic rod 20 are fixedly connected to the side wall of the slider 19. A return spring 21 is sleeved on each telescopic rod 20. Both ends of each return spring 21 are respectively fixedly connected to the side wall of the slider 19 and the inner wall of the sliding groove. The upper end surface of each slider 19 is rotatably connected to a connecting rod 23. The other end of each connecting rod 23 is rotatably connected to a short rod 24. Through the cooperative setting of the slider 19, the telescopic rod 20 and the return spring 21, the bolt 22 can be driven to insert into the limiting groove. Through the cooperative setting of the bolt 22 and the limiting groove, the disc 17 can be limited, so that the vertical rod 16 can be prevented from rotating, the device can be prevented from loosening, the sealing effect of the device can be improved, and the phenomenon of concrete leakage at the connection seam can be prevented.

[0031] Among them, four fixing blocks 14 are symmetrically and fixedly connected to the inner wall of the first pipe sleeve 3. Positioning grooves are formed on the opposite sides of each fixing block 14. Limiting rods 15 are fixedly connected to the opposite sides of the multiple clamping plates 9. The other end of each limiting rod 15 is slidably connected in the positioning groove. The limiting rod 15 can limit the clamping plate 9.

[0032] Among them, multiple sliding rods 28 are all slidably connected in the inner wall of the fixed cylinder 27. A buffer spring 30 is sleeved on each sliding rod 28. Both ends of each buffer spring 30 are respectively fixedly connected to the inner wall of the second pipe sleeve 26 and the side wall of the fixed cylinder 27. Through the cooperative setting of the second pipe sleeve 26, the sliding rod 28 and the buffer spring 30, the device can be buffered, and the connection seam between the connecting pipe 1 and the connecting pipe 2 can be prevented from being misaligned due to the external sediment pressure, and the phenomenon of concrete leakage at the connection seam between the connecting pipe 1 and the connecting pipe 2 can be further prevented.

[0033] Among them, the upper ends of the four short rods 24 all penetrate through the upper end surface of the first pipe sleeve 3 and are fixedly connected to a pulling plate 25. Each short rod 24 is slidably connected in the inner wall of the first pipe sleeve 3. Multiple bolts 22 are all slidably connected in the inner wall of the cross plate 18. The bolt 22 can limit the disc 17.

[0034] Among them, the four push rods 8 are all slidably connected in the inner wall of the straight cylinder 4. The four vertical rods 16 are all rotatably connected in the inner walls of the straight cylinder 4 and the first pipe sleeve 3. The opposite ends of the connecting pipe 2 and the connecting pipe 1 are abutted against each other. The push rod 8 can drive the clamping plate 9 to move.

[0035] Among them, the upper end surface of each clamping plate 9 abuts against. Four card slots are symmetrically formed on the lower end surface of the first annular mounting plate 11. The upper end surface of each clamping block 10 abuts in the card slot. The clamping plate 9 can make the first annular mounting plate 11 fit tightly on the second annular mounting plate 12.

[0036] In the present invention, during installation, one end of the connecting pipe 1 is abutted against the connecting pipe 2, the lower end of the connecting pipe 2 is inserted into the connecting pipe 1, the first annular mounting plate 11 is abutted against the second annular mounting plate 12, and then the clamping plate 9 is rotated to align the limiting rod 15 with the positioning groove. The pull plate 25 is pulled upward. The pull plate 25 will drive the short rod 24 to move upward. The short rod 24 drives the slider 19 to move relatively through the connecting rod 23 and compress the return spring 21. The slider 19 will drive the bolt 22 to move and disengage from the limiting groove. Then the knob is rotated. The knob will drive the vertical rod 16 to rotate. The vertical rod 16 will drive the threaded rod 5 to rotate. The threaded rod 5 will drive the threaded sleeve 6 to move upward. The threaded sleeve 6 will drive the push rod 8 to move upward through the push plate 7. The push rod 8 will drive the clamping plate 9 to move upward and make the limiting rod 15 slide in the positioning groove. The positioning groove can position the clamping plate 9. The clamping plate 9 moves upward and abuts against the first annular mounting plate 11 and makes the clamping block 10 abut in the clamping groove. The clamping plate 9 can squeeze the first annular mounting plate 11, so that the first annular mounting plate 11 is closely attached to the second annular mounting plate 12, thereby the first annular mounting plate 11 and the second annular mounting plate 12 can be limited and fixed, and thus the connecting pipe 2 and the connecting pipe 1 can be fixed and limited. Moreover, the sealing ring can seal the device;

[0037] Further, when the pull plate 25 is released, the slider 19 is reset under the elastic force of the return spring 21, so that the slider 19 moves away from each other. The slider 19 will drive the bolt 22 to move away from each other and abut against the limiting groove. The cooperation of the bolt 22 and the limiting groove can limit the disc 17, thereby preventing the vertical rod 16 from rotating, thereby preventing the device from loosening, improving the sealing effect of the device, and thus preventing the phenomenon of concrete leakage at the connection seam;

[0038] Further, a second pipe sleeve 26 is sleeved on the first pipe sleeve 3. When the device is extruded by external sediment, through the cooperation of the second pipe sleeve 26, the sliding rod 28 and the buffer spring 30, the device can be buffered, preventing the connection seam between the connecting pipe 1 and the connecting pipe 2 from being misaligned under the pressure of external sediment, and further preventing the phenomenon of concrete leakage at the connection seam between the connecting pipe 1 and the connecting pipe 2.

[0039] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining, comprising a connecting pipe (1), a connecting tube (2) and a buffer mechanism, characterized in that, A first pipe sleeve (3) is fixedly sleeved on the side wall of the connecting pipe (2). Four straight cylinders (4) are symmetrically and fixedly connected to the inner wall of the first pipe sleeve (3). A threaded rod (5) is rotatably connected to the inner wall of each straight cylinder (4). A threaded sleeve (6) is meshed and connected to each threaded rod (5). A push plate (7) is fixedly connected to the opposite side of each threaded sleeve (6). A push rod (8) is fixedly connected to the lower end surface of each push plate (7). The lower end of each push rod (8) penetrates through the lower end surface of the straight cylinder (4) and is rotatably connected to a clamping plate (9). A clamping block (10) is fixedly connected to the upper end surface of each clamping plate (9). A second annular mounting plate (12) is fixedly sleeved on the side wall of the connecting pipe (2). A first annular mounting plate (11) is fixedly sleeved on the side wall of the connecting pipe (1). Sealing rings are fixedly connected to the opposite ends of the first annular mounting plate (11) and the second annular mounting plate (12). A vertical rod (16) is fixedly connected to the upper end of each threaded rod (5). The upper end of each vertical rod (16) penetrates through the upper end surfaces of the straight cylinder (4) and the first pipe sleeve (3) and is fixedly connected to a knob. A disc (17) is fixedly sleeved on each vertical rod (16). Four cross plates (18) are symmetrically and fixedly connected to the side wall of the connecting pipe (2). A chute is formed in the upper end surface of each cross plate (18). A slider (19) is slidably connected in each chute. A plug pin (22) is fixedly connected to the opposite side of each slider (19). A plurality of limiting grooves are symmetrically and equally spaced on the side wall of each disc (17). The opposite end of each plug pin (22) penetrates through the chute and abuts in the limiting groove; An expansion rod (20) is fixedly connected in each of the plurality of chutes. The telescopic end of each expansion rod (20) is fixedly connected to the side wall of the slider (19). A return spring (21) is sleeved on each expansion rod (20). The two ends of each return spring (21) are respectively fixedly connected to the side wall of the slider (19) and the inner wall of the chute. A connecting rod (23) is rotatably connected to the upper end surface of each slider (19). The other end of each connecting rod (23) is rotatably connected to a short rod (24); The upper ends of the four short rods (24) penetrate through the upper end surface of the first pipe sleeve (3) and are fixedly connected to a pulling plate (25). Each short rod (24) is slidably connected in the inner wall of the first pipe sleeve (3). The plurality of plug pins (22) are slidably connected in the inner wall of the cross plate (18).

2. The leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining according to claim 1, characterized in that, The buffer mechanism includes a second pipe sleeve (26). The second pipe sleeve (26) is fixedly sleeved on the first pipe sleeve (3). Four fixed cylinders (27) are symmetrically and fixedly connected to the side wall of the first pipe sleeve (3). A plurality of sliding rods (28) are symmetrically and fixedly connected to the inner wall of the second pipe sleeve (26). The other end of each sliding rod (28) penetrates through the side wall of the fixed cylinder (27) and is fixedly connected to a fixing plate (29).

3. The leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining according to claim 1, characterized in that, Four fixing blocks (14) are symmetrically and fixedly connected to the inner wall of the first sleeve (3). Positioning grooves are formed in the opposite sides of each fixing block (14). Limiting rods (15) are fixedly connected to the opposite sides of the plurality of clamping plates (9). The other ends of each limiting rod (15) are slidably connected in the positioning grooves.

4. The leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining according to claim 2, characterized in that, The plurality of sliding rods (28) are all slidably connected in the inner wall of the fixed cylinder (27). A buffer spring (30) is sleeved on each sliding rod (28). The two ends of each buffer spring (30) are respectively fixedly connected to the inner wall of the second sleeve (26) and the side wall of the fixed cylinder (27).

5. The leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining according to claim 1, characterized in that, The four push rods (8) are all slidably connected in the inner wall of the straight cylinder (4). The four vertical rods (16) are all rotatably connected in the inner walls of the straight cylinder (4) and the first sleeve (3). The opposite ends of the connecting pipe (2) and the connecting pipe (1) are in contact with each other.

6. The leakage prevention structure for the joint of bored cast-in-place piles for foundation pit retaining according to claim 1, characterized in that, Four card slots are symmetrically formed in the lower end face of the first annular mounting plate (11). The upper end face of each card block (10) abuts against the card slot.

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