A pile head structure for cast-in-place piles

Abstract

This utility model belongs to the field of pile head breaking technology for cast-in-place piles, specifically a pile head structure for cast-in-place piles, including a pile cap, a first overflow hole, and a sleeve. The pile cap is located at the elevation of the reinforcing cage and is fixedly connected to the reinforcing cage. The diameter of the pile cap is the same as the diameter of the cast-in-place pile. A central hole for a concrete pump pipe to pass through is opened at the center of the pile cap. Multiple first overflow holes are arranged in a centrally symmetrical manner on the pile cap. The sleeve is supported on the top of the pile cap and is fitted onto the outside of the reinforcing bars in a corresponding manner. This reduces the probability of the reserved reinforcing bars being cut during the later breaking of the pile head, improves the efficiency of pile head breaking, and protects the pile body below the designed pile elevation from damage.

Description

Technical Field

[0001] This utility model relates to the field of pile head removal technology for cast-in-place piles; specifically, this utility model relates to a pile head structure for cast-in-place piles. Background Technology

[0002] In construction engineering, cast-in-place piles are widely used in various foundation projects due to their high bearing capacity and strong adaptability. However, after the cast-in-place piles are constructed, the excess concrete at the top of the pile (i.e., the "virtual pile head") needs to be removed to ensure an effective connection between the pile body and the pile cap or ground beam. The traditional method for removing the pile head involves first using a cutting machine to circumferentially cut the pile head, drilling holes, and driving in expansion bolts, followed by manual removal using a pneumatic hammer. However, this method still has significant drawbacks in practical applications. When circumferentially cutting the pile head, it is easy to cut the pre-reserved reinforcing steel bars in the pile head, and it is also easy to cause collateral damage to the concrete below the designed pile top elevation. Secondary concrete repair of the damaged pile head is required later, resulting in slow construction speed and serious uncertainty in construction quality. Utility Model Content

[0003] In view of this, the present invention provides a pile head structure for cast-in-place piles, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0004] To achieve the aforementioned objectives, this utility model provides a pile head structure for cast-in-place piles, including a pile cap, a first overflow hole, and a sleeve. The pile cap is located at the elevation of the reinforcing cage and is fixedly connected to the reinforcing cage. The diameter of the pile cap is the same as the diameter of the cast-in-place pile. A central hole for a concrete pump pipe to pass through is provided at the center of the pile cap. Multiple first overflow holes are arranged in a centrally symmetrical manner on the pile cap. The sleeve is supported on the top of the pile cap and is fitted onto the outside of the reinforcing steel bars one by one.

[0005] Preferably, it further includes an overflow pipe, a second overflow hole, and an upper ring plate. The bottom end of the overflow pipe is connected to the first overflow hole, the second overflow hole is located at the bottom of the side of the overflow pipe, the upper ring plate is fixed to the reinforcing bar, and the upper ring plate presses down on the top end of the overflow pipe. The sleeve passes through the upper ring plate.

[0006] Preferably, it further includes a lower ring plate, a sleeve groove, and a first sleeve ring. The lower ring plate is bolted to the bottom of the upper ring plate, the sleeve passes through the lower ring plate, the first sleeve ring is circular and fixedly disposed outside the sleeve, a circular sleeve groove is provided between the upper ring plate and the lower ring plate, the inner diameter of the sleeve groove is larger than the outer diameter of the first sleeve ring, and the first sleeve ring is located inside the sleeve groove.

[0007] Preferably, a lower extension block is provided on the circumferential surface of the lower ring plate, an upper extension block is provided on the circumferential surface of the upper ring plate, a bolt is rotatably provided on the top of the lower extension block, and the upper extension block is threadedly connected to the bolt.

[0008] Preferably, it also includes a pipe cap, which is threaded onto the top of the reinforcing bar and presses down on the sleeve, and multiple pipe caps are provided in a centrally symmetrical distribution.

[0009] Preferably, it further includes a limiting groove, which is provided corresponding to the side wall of the first overflow hole, and the bottom end of the overflow pipe is inserted into the limiting groove.

[0010] Preferably, it further includes a limiting ring, one of which is provided at the top of each of the first overflow holes, the inner diameter of the limiting ring being adapted to the inner diameter of the first overflow hole, and the limiting groove being provided on the inner wall surface of the limiting ring.

[0011] Preferably, the device further includes a cone, a plug, and a handle. The tip of the cone faces downward, the second overflow hole is located directly below the side of the cone, the cone slides axially with the overflow pipe, the top of the cone is rotatably fitted with the plug, the plug passes through the upper ring plate, and the handle is vertically fixed to the top of the plug.

[0012] Preferably, the system further includes a chute and a slider. The chute is disposed on the inner side wall of the overflow pipe and is in the shape of an inverted "L". The slider is slidably disposed in the chute and is fixedly connected to the insert rod.

[0013] Preferably, it further includes a second collar and a circular groove. The second collar is fixedly disposed at the top end of the overflow pipe, and the circular groove is disposed on the lower surface of the upper plate. The second collar is located inside the circular groove, and the inner diameter of the circular groove is larger than the outer diameter of the second collar.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This application uses a pile cap as a rigid isolation layer. When breaking the pile head later, drilling holes around the top edge of the pile cap and driving in expansion bolts will make it easy for the pile head to separate from the pile body, thus increasing the speed of pile head breaking in cast-in-place piles.

[0015] 2. This application isolates the reserved steel bars from the concrete by installing a sleeve on the reserved steel bars above the design elevation of the pile top, thus protecting the steel bars and effectively reducing the probability of the reserved steel bars being cut. It can also be quickly separated from the steel bars during hoisting after the pile head is broken.

[0016] 3. This application installs an overflow pipe at the top of the first overflow hole and removes the overflow pipe when the concrete initially sets, so that the concrete forms a void area at the top of the first overflow hole after forming. This allows for precise positioning of the first overflow hole during subsequent demolition, facilitating the demolition and separation of the pile head and improving the efficiency of pile head demolition.

[0017] 4. This application, by removing the overflow pipe and sleeve after the concrete has initially set, and then by setting the first and second sleeves, can adapt to the changes in the relative positions of the reinforcing bars and overflow holes on different cast-in-place piles. The overflow pipe and sleeve can be reused multiple times, reducing construction costs.

[0018] 5. This application uses a cone that can slide axially inside the overflow pipe to clean the overflow pipe and the second overflow hole after the concrete is extracted from the overflow pipe. Attached Figure Description

[0019] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings: Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model; Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the overflow pipe and the second overflow hole in Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of the pile cap, limiting groove, and limiting ring of Embodiment 2 of this utility model; Figure 5 This is a bottom view of the upper ring plate in Embodiment 2 of this utility model; Figure 6 This is a cross-sectional view of the lower ring plate in Embodiment 2 of this utility model; Figure 7 This is a cross-sectional view of the sleeve and cap according to Embodiment 2 of this utility model; Figure 8 This is a cross-sectional view of the overflow pipe in Embodiment 2 of this utility model; Figure 9 This is a front view of the insert rod and cone in Embodiment 2 of this utility model.

[0020] Reference numerals in the attached drawings: 1-Pile cap; 2-First overflow hole; 3-Sleeve; 4-Overflow pipe; 5-Second overflow hole; 6-Upper ring plate; 7-Lower ring plate; 8-Sleeve groove; 9-First sleeve ring; 10-Lower extension block; 11-Upper extension block; 12-Bolt; 13-Pipe cap; 14-Limiting groove; 15-Limiting ring; 16-Cone; 17-Insertion rod; 18-Handle; 19-Sliding groove; 20-Sliding block; 21-Second sleeve ring; 22-Circular groove; 23-Lifting ring. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Example 1 like Figure 1 As shown, a pile head structure for cast-in-place piles includes a pile cap 1, a first overflow hole 2, and a sleeve 3. The pile cap 1 is located at the elevation of the reinforcing cage and is fixedly connected to the reinforcing cage. The diameter of the pile cap 1 is the same as the diameter of the cast-in-place pile. A central hole for a concrete pump pipe to pass through is opened at the center of the pile cap 1. Multiple first overflow holes 2 are arranged in a centrally symmetrical manner on the pile cap 1. The sleeve 3 is supported on the top of the pile cap 1 and is fitted onto the outside of the reinforcing steel bars one by one.

[0023] During the fabrication of the reinforcing cage for the cast-in-place pile, the design elevation of the pile top is measured on the reinforcing cage. Then, a pile cap 1 of the same size as the diameter of the cast-in-place pile is welded at this position. The pile cap 1 is a metal product with a thickness of about mm. The periphery of the pile cap 1 is turned down to protect the pile body below the elevation of the cast-in-place pile during the demolition of the cast-in-place pile, thus preventing damage to the pile body below the elevation. A central hole is reserved in the center of the pile cap 1 to allow the concrete pump pipe to pass through smoothly. Multiple first overflow holes 2 are set on the top of the pile cap 1 in a circumferential direction to ensure dense grouting, prevent voids below the pile cap 1, and control over-grouting. A sleeve 3 is installed on the pre-reserved steel bar above the design elevation of the pile top to isolate the pre-reserved steel bar from the concrete, protect the steel bar, and effectively reduce the probability of the pre-reserved steel bar being cut. It can be quickly separated from the steel bar when the pile head is broken and hoisted. The pile cap 1, as a rigid isolation layer, can be drilled around the pile head and driven into the pile body when the pile head is broken in the later stage. The pile head will then be easily separated from the pile body, which will improve the speed of pile head breaking.

[0024] Example 2 like Figures 2 to 9As shown, a pile head structure for cast-in-place piles also includes an overflow pipe 4, a second overflow hole 5, and an upper ring plate 6. The bottom end of the overflow pipe 4 is connected to the first overflow hole 2. The second overflow hole 5 is located at the bottom of the side of the overflow pipe 4. The upper ring plate 6 is fixed to the reinforcing bar and presses down on the top end of the overflow pipe 4. The sleeve 3 passes through the upper ring plate 6.

[0025] The overflow pipe 4 is connected above the first overflow hole 2. When pouring concrete, the concrete overflows from below the first overflow pipe 4 into the overflow pipe 4 and is blocked by the overflow pipe 4. The concrete flows out through the second overflow hole 5. The upper ring plate 6 is fixed to the steel bar, which stably keeps the overflow pipe 4 in a compressed state. After the concrete has initially set, when the overflow pipe 4 is pulled out, a void area is formed above the first overflow hole 2. During subsequent demolition, the construction personnel can better locate the position of the first overflow hole 2 and achieve precise drilling. With the pile cap 1, it is easier to separate the pile head from the pile body below the elevation and improve the efficiency of pile head demolition.

[0026] The pile head structure of the cast-in-place pile of this application also includes a lower ring plate 7, a sleeve groove 8 and a first sleeve ring 9. The lower ring plate 7 is bolted to the bottom of the upper ring plate 6, and the sleeve 3 passes through the lower ring plate 7. The first sleeve ring 9 is circular and fixedly installed outside the sleeve 3. A circular sleeve groove 8 is provided between the upper ring plate 6 and the lower ring plate 7. The inner diameter of the sleeve groove 8 is larger than the outer diameter of the first sleeve ring 9, and the first sleeve ring 9 is located inside the sleeve groove 8.

[0027] The first ring 9 is located inside the groove 8 and is supported by the lower ring plate 7. The upper ring plate 6 is located above the lower ring plate 7. Both the upper ring plate 6 and the sleeve 3 are stably supported by the lower ring plate 7. There is a deviation in the relative position of different reinforcing bars. The sleeve 3 is fitted outside the reinforcing bars. The inner diameter of the groove 8 is larger than the outer diameter of the first ring 9. The first ring 9 can undergo a certain horizontal displacement within the groove 8. The sleeve 3 can adapt to the deviation in the relative position of different reinforcing bars.

[0028] A lower extension block 10 is provided on the circumferential surface of the lower ring plate 7, and an upper extension block 11 is provided on the circumferential surface of the upper ring plate 6. A bolt 12 is rotatably provided on the top of the lower extension block 10, and the upper extension block 11 is threadedly connected to the bolt 12.

[0029] The lower ring plate 7 is supported by the sleeve 3, which is fitted onto the reinforcing bar. The lower ring plate 7 and the upper ring plate 6 are connected by bolts 12. Rotating the bolts 12 fixes the upper ring plate 6 and the lower ring plate 7, thereby improving the overall structural stability.

[0030] The pile head structure of the cast-in-place pile in this application also includes a pipe cap 13, which is threaded onto the top of the reinforcing bar and presses down on the sleeve 3. Multiple pipe caps 13 are arranged in a centrally symmetrical manner.

[0031] The cap 13 is located at the top of the sleeve 3. After the sleeve 3 is fitted onto the outside of the reinforcing bar, the cap 13 is threaded to the top of the reinforcing bar. When the cap 13 is rotated, it moves downward and presses down on the sleeve 3, so that the sleeve 3 is fixed by the reinforcing bar. The bottom of the sleeve 3 is close to the top of the pile cap 1. The lower ring plate 7 is fixed by the sleeve 3. The upper ring plate 6 is bolted to the lower ring plate 7 and fixed by the lower ring plate 7.

[0032] The pile head structure of the cast-in-place pile in this application also includes a limiting groove 14, which is provided corresponding to the side wall of the first overflow hole 2, and the bottom end of the overflow pipe 4 is inserted into the limiting groove 14.

[0033] The overflow pipe 4 is positioned within the limiting groove 14 to locate the first overflow groove. The bottom of the overflow pipe 4 is inserted into the limiting groove 14 to prevent misalignment between the overflow pipe 4 and the first overflow hole 2.

[0034] The pile head structure of the cast-in-place pile of this application also includes a limiting ring 15, which is provided at the top of each first overflow hole 2. The inner diameter of the limiting ring 15 is adapted to the inner diameter of the first overflow hole 2, and the limiting groove 14 is provided on the inner wall surface of the limiting ring 15.

[0035] The limiting groove 14 is formed on the inner wall surface of the limiting ring 15. After the overflow pipe 4 is inserted into the limiting ring 15, the inner wall surface of the overflow pipe 4 can fit with the inner wall surface of the first limiting groove 14.

[0036] The pile head structure of the cast-in-place pile of this application also includes a cone 16, a rod 17 and a handle 18. The tip of the cone 16 faces downward, and the second overflow hole 5 is located directly below the side of the cone 16. The cone 16 slides in axial direction with the overflow pipe 4. The top of the cone 16 is rotatably fitted with the rod 17, which passes through the upper ring plate 6. The handle 18 is vertically fixed to the top of the rod 17.

[0037] The tip of the vertebral body 16 points downwards, and the protruding part on the side of the vertebral body 16 is located inside the second overflow hole 5. When the vertebral body 16 is in the highest position, the top surface of the protruding part on the side of the vertebral body 16 is in contact with the inner top surface of the second overflow hole 5. When pouring concrete, the vertebral body 16 is in the highest position, and the tip of the vertebral body 16 points downwards. The concrete overflows from the first overflow hole 2 into the overflow pipe 4 and contacts the tip of the bottom of the vertebral body 16, making it easier to flow to the second overflow hole 5 and dispersing the upward pressure of the concrete on the overflow pipe 4. The insert rod 17 controls the cone 16 to slide axially within the overflow pipe 4. The protruding part on the side of the cone 16 slides axially within the second overflow hole 5. When the concrete initially sets, the overflow pipe 4 is pulled out of the concrete. Pushing the handle 18 downwards can cause the cone 16 to slide axially downwards within the overflow pipe 4. The concrete remaining in the overflow pipe 4 can be pushed out of the overflow pipe 4 by the cone 16. The concrete in the second overflow hole 5 can be pushed out by the protruding part on the side of the cone 16, thus cleaning the concrete in the overflow pipe 4 and the second overflow hole 5.

[0038] The pile head structure of the cast-in-place pile of this application also includes a groove 19 and a slider 20. The groove 19 is provided on the inner side wall of the overflow pipe 4 and is in the shape of an inverted "L". The slider 20 is slidably provided in the groove 19 and is fixedly connected to the insertion rod 17.

[0039] When pouring concrete, the slider 20 is located in the horizontal section of the chute 19, the insert rod 17 is supported by the chute 19, and the cone 16 can be stably held in the highest position. When cleaning the concrete in the overflow pipe 4, the slider 20 is moved to the vertical section of the chute 19 by rotating the handle 18. At this time, the cone 16 can slide axially in the overflow pipe 4.

[0040] The pile head structure of the cast-in-place pile of this application also includes a second collar 21 and a circular groove 22. The second collar 21 is fixedly installed at the top of the overflow pipe 4, and the circular groove 22 is installed on the lower surface of the upper plate. The second collar 21 is located inside the circular groove 22, and the inner diameter of the circular groove 22 is larger than the outer diameter of the second collar 21.

[0041] The second ring 21 is located in the circular groove 22, between the upper ring plate 6 and the lower ring plate 7. The lower surface of the upper ring plate 6 and the top surface of the lower ring plate 7 are in contact. The second ring 21 is supported by the lower ring plate 7. The inner diameter of the circular groove 22 is larger than the outer diameter of the second ring 21. The second ring 21 can be offset to a certain extent in the circular groove 22 to adapt to the different relative positions between the first overflow holes 2. The top of the upper ring plate 6 is provided with four lifting rings 23 evenly distributed along the circumference. When the concrete initially sets, the pipe cap 13 is removed from the top of the reinforcing bar, and the upper ring plate 6 is vertically lifted by the lifting rings 23. The upper ring plate 6 and the lower ring plate 7 are threadedly connected. The lower ring plate 7 is lifted along with the upper ring plate 6. At this time, the sleeve 3 is separated from the reinforcing bar, and the overflow pipe 4 is separated from the limiting groove 14.

[0042] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.

Claims

1. A pile head structure for cast-in-place piles, characterized in that, The pile cap (1), the first overflow hole (2), and the sleeve (3) are included. The pile cap (1) is located at the elevation of the reinforcing cage and is fixedly connected to the reinforcing cage. The diameter of the pile cap (1) is the same as the diameter of the cast-in-place pile. A central hole for the concrete pump pipe to pass through is opened at the center of the pile cap (1). Multiple first overflow holes (2) are arranged in a centrally symmetrical manner on the pile cap (1). The sleeve (3) is supported on the top of the pile cap (1) and is fitted onto the outside of the reinforcing steel in a corresponding manner.

2. The pile head structure of a cast-in-place pile as described in claim 1, characterized in that, It also includes an overflow pipe (4), a second overflow hole (5) and an upper ring plate (6). The bottom end of the overflow pipe (4) is connected to the first overflow hole (2). The second overflow hole (5) is located at the bottom of the side of the overflow pipe (4). The upper ring plate (6) is fixed on the reinforcing bar and the upper ring plate (6) presses down on the top end of the overflow pipe (4). The sleeve (3) passes through the upper ring plate (6).

3. The pile head structure of a cast-in-place pile as described in claim 2, characterized in that, It also includes a lower ring plate (7), a sleeve groove (8) and a first sleeve ring (9). The lower ring plate (7) is bolted to the bottom of the upper ring plate (6). The sleeve (3) passes through the lower ring plate (7). The first sleeve ring (9) is circular and fixedly disposed outside the sleeve (3). A circular sleeve groove (8) is provided between the upper ring plate (6) and the lower ring plate (7). The inner diameter of the sleeve groove (8) is larger than the outer diameter of the first sleeve ring (9), and the first sleeve ring (9) is located inside the sleeve groove (8).

4. The pile head structure of a cast-in-place pile as described in claim 3, characterized in that, The lower ring plate (7) has a lower extension block (10) on its circumferential surface, and the upper ring plate (6) has an upper extension block (11) on its circumferential surface. The top of the lower extension block (10) is rotatably provided with a bolt (12), and the upper extension block (11) is threadedly connected to the bolt (12).

5. The pile head structure of a cast-in-place pile as described in claim 4, characterized in that, It also includes a cap (13), which is threaded onto the top of the reinforcing bar and presses down on the sleeve (3). Multiple caps (13) are provided in a centrally symmetrical arrangement.

6. The pile head structure of a cast-in-place pile as described in claim 2, characterized in that, It also includes a limiting groove (14), which is provided on the side wall of the first overflow hole (2), and the bottom end of the overflow pipe (4) is inserted into the limiting groove (14).

7. The pile head structure of a cast-in-place pile as described in claim 6, characterized in that, It also includes a limiting ring (15), one of which is provided at the top of each of the first overflow holes (2). The inner diameter of the limiting ring (15) is adapted to the inner diameter of the first overflow hole (2), and the limiting groove (14) is provided on the inner wall surface of the limiting ring (15).

8. The pile head structure of a cast-in-place pile as described in claim 2, characterized in that, It also includes a cone (16), a rod (17) and a handle (18). The tip of the cone (16) is facing down. The second overflow hole (5) is located directly below the side of the cone (16). The cone (16) slides in axial direction with the overflow pipe (4). The top of the cone (16) is rotatably fitted with the rod (17). The rod (17) passes through the upper ring plate (6). The handle (18) is vertically fixed to the top of the rod (17).

9. The pile head structure of a cast-in-place pile as described in claim 8, characterized in that, It also includes a chute (19) and a slider (20). The chute (19) is disposed on the inner side wall of the overflow pipe (4) and the chute (19) is in the shape of an inverted "L". The slider (20) is slidably disposed in the chute (19) and the slider (20) is fixedly connected to the plug rod (17).

10. The pile head structure of a cast-in-place pile as described in claim 3, characterized in that, It also includes a second collar (21) and a circular groove (22). The second collar (21) is fixedly disposed at the top of the overflow pipe (4), and the circular groove (22) is disposed on the lower surface of the upper ring plate (6). The second collar (21) is located inside the circular groove (22), and the inner diameter of the circular groove (22) is greater than the outer diameter of the second collar (21).

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