Construction device and method for free-cutting pile head type bored pile

Abstract

The application relates to the technical field of bored pile construction, in particular to a bored pile construction device without cutting pile heads, which comprises an outer sleeve pipe and an inner isolation plate, a catheter passing hole is formed in the central position of the inner isolation plate, a main reinforcement passing hole is formed in the part close to the edge of the inner isolation plate, sliding openings are formed in the inner side wall of the catheter passing hole, two sliding openings are formed in the sliding openings, sealing blocks are respectively slid in the sliding openings, a plurality of guide holes are formed in the inner isolation plate, the guide holes are communicated with the sliding openings, and a feeding assembly for promoting the movement of the sealing blocks towards the central position of the inner isolation plate is arranged in the guide holes. The inner isolation plate has a limiting effect, so that the pouring height of the concrete is guaranteed; meanwhile, the two sealing blocks clamped on the outer side wall of the catheter also have a limiting effect, the amount of concrete overflowing through the catheter passing hole is reduced, the effect of breaking the bored pile head is realized, and the construction efficiency of the bored pile is improved.

Description

Technical Field

[0001] This application relates to the technical field of bored pile construction, and in particular to a bored pile construction device and construction method that does not require pile head cutting. Background Technology

[0002] Drilled cast-in-place piles are piles constructed by creating pile holes in the foundation soil on-site using methods such as mechanical drilling, steel pipe extrusion, or manual excavation, placing a reinforcing cage inside, and then pouring concrete into the holes. Because cast-in-place piles typically use self-compacting concrete, the upper part of the concrete has lower density and less coarse aggregate after self-compacting, resulting in lower concrete strength. Furthermore, since the longitudinal reinforcement of the pile needs to be separately connected to the reinforcement of the columns in the superstructure, most cast-in-place piles require pile breaking after completion in current technology.

[0003] Conventional pile breaking work involves chiseling or cutting the pile, which breaks the concrete above the pile to expose the longitudinal reinforcement. However, conventional pile breaking work is not only labor-intensive and time-consuming, but also causes significant damage or even destruction to the longitudinal reinforcement in the pile, which in turn affects the connection of subsequent reinforcement and the reliability of the structure.

[0004] Currently, Chinese patent CN217629902U discloses a non-destructive pile head isolation device for reinforced concrete cast-in-place piles, including a first cylinder; a second cylinder, coaxially fitted inside the first cylinder; and an annular plate, disposed between the first and second cylinders, with the outer side of the annular plate fixed to the first cylinder and the inner side of the annular plate fixed to the second cylinder, and multiple holes provided on the annular plate.

[0005] Although the aforementioned isolation device can effectively separate invalid pile heads from valid pile bodies, a large amount of concrete will still remain inside the second cylinder. After the cast-in-place pile solidifies, the concrete inside the second cylinder still needs to be removed. In addition, the concrete pouring guide pipe is connected to the inner wall of the second cylinder by a sliding connection. During the concrete pouring process, a large amount of concrete will still overflow, and it will still need to be removed after solidification. In summary, the aforementioned isolation device cannot effectively remove the pile head. Summary of the Invention

[0006] In order to achieve the effect of eliminating the need to break the pile head of bored cast-in-place piles and improve the construction efficiency of bored cast-in-place piles, this application provides a construction device and construction method for bored cast-in-place piles that eliminates the need to cut the pile head.

[0007] This application provides a construction device for bored piles that does not require pile head cutting, and adopts the following technical solution:

[0008] A construction device for bored piles without pile head cutting includes an outer sleeve and an inner isolation plate. The inner isolation plate is detachably connected inside the outer sleeve and is circular. A guide pipe through hole is passed through the center of the inner isolation plate, and a main reinforcement through hole is passed through the portion of the inner isolation plate near its edge. Several main reinforcement through holes are provided circumferentially. The device is characterized in that: a sliding port is provided on the inner sidewall of the guide pipe through hole, and two sliding ports are provided opposite each other. A sealing block slides in each sliding port. Several guide holes are provided on the inner isolation plate, and the guide holes communicate with the sliding ports. A feeding component is provided in the guide holes to promote the movement of the sealing block toward the center of the inner isolation plate.

[0009] By adopting the above technical solution, during construction, workers use hoisting equipment to lift the construction device onto the pile hole of the cast-in-place pile, and then slowly lower the device. Lowering stops when the lower surface of the inner isolation plate reaches the design elevation of the pile. Next, workers insert the grouting guide pipe into the pile hole through the guide pipe passage hole. When the guide pipe reaches the design position, the feeding component moves the sealing blocks towards the center of the inner isolation plate, so that the two sealing blocks clamp the outer wall of the guide pipe. Then, concrete is poured into the pile hole through the guide pipe. During the concrete pouring process, the inner isolation plate acts as a restraint to ensure the concrete pouring height, while the two sealing blocks clamped on the outer wall of the guide pipe also act as a restraint, reducing the amount of concrete overflowing through the guide pipe passage hole. This achieves the effect of avoiding the destruction of the pile head of the bored cast-in-place pile, improving the construction efficiency of the bored cast-in-place pile.

[0010] Preferably, the feeding assembly includes a feeding head, a connecting rod, and a feeding rod. The feeding head is elliptical, and the sidewall of the feeding head contacts the sidewall of the sealing block away from the center of the inner partition plate. The connecting rod is fixedly connected to the feeding head, and the feeding rod is rotatably connected to the connecting rod. The feeding rod extends out of the surface of the inner partition plate after passing through the guide hole, and the feeding rod is threadedly engaged with the inner sidewall of the guide hole.

[0011] By adopting the above technical solution, after the position of the conduit through the conduit through hole is fixed, the operator rotates the feed rod. The threaded engagement between the feed rod and the inner wall of the guide hole causes the feed rod to move downward. During the downward movement of the feed rod, the feed rod causes the connecting rod to drive the feed head downward. Since the feed head is elliptical, the sealing block that contacts the feed head gradually extends out from the sliding port until the sealing blocks on both sides are pressed against the outer wall of the conduit, thereby achieving the clamping of the conduit.

[0012] Preferably, the sealing block is provided with a reset assembly, which includes a reset spring, an abutment plate, and a plug. A reset sliding hole is formed on the inner wall of the conduit through hole, and a connecting hole communicating with the sliding port is formed on the inner wall of the reset sliding hole. The abutment plate is fixedly connected to the sealing block. The abutment plate enters the reset sliding hole after passing through the connecting hole. The plug is threadedly connected to the opening of the reset sliding hole. The reset spring is located between the plug and the abutment plate.

[0013] By adopting the above technical solution, as the sealing block gradually extends from the sliding port, the abutment plate gradually moves towards the plug, and the reset spring is compressed and gains elastic potential energy. When the conduit is filled, the operator rotates the feed rod in the opposite direction, and the feed rod moves upward, causing the connecting rod to drive the feed head upward. At this time, the elastic potential energy of the reset spring is released, causing the end of the sealing block near the inner isolation plate to fully enter the sliding port, thereby releasing the clamping of the sealing block on the conduit and making it easier for the operator to pull out the conduit.

[0014] Preferably, a tightening assembly is provided on the main rib through hole. The tightening assembly includes a tightening sleeve and a tightening nut. The tightening sleeve is threaded to the opening of the main rib through hole. A diameter reduction orifice is opened on the tube wall of the tightening sleeve away from the main rib through hole. Several diameter reduction orifices are opened along the circumference of the tightening sleeve. An external thread is provided on the outer side wall of the tightening sleeve. The tightening nut is threaded to the outside of the tightening sleeve.

[0015] By adopting the above technical solution, during operation, each main bar of the steel cage passes through the corresponding main bar through hole in sequence. Then, the worker rotates the tightening nut. As the tightening nut moves upward, the tightening sleeve gradually closes until the tightening sleeve clamps the main bar, thereby fixing the position between the device and the steel cage in this embodiment of the application.

[0016] Preferably, it also includes an expansion ring, which can be arranged in several layers outside the inner isolation plate according to the outer diameter of the cast-in-place pile. The main reinforcement has several holes along the circumference of the expansion ring, and the outer side wall of the inner isolation plate and the outer side wall of the expansion ring are respectively provided with abutting components.

[0017] By adopting the above technical solution, the expansion rings can be either not installed outside the inner isolation plate, or several layers can be installed outside the inner isolation plate, depending on the outer diameter of the cast-in-place pile. When the outer diameter of the cast-in-place pile to be constructed is the same as the outer diameter of the inner isolation plate, the expansion rings are not installed outside the inner isolation plate; when the outer diameter of the cast-in-place pile to be constructed is larger than the outer diameter of the inner isolation plate, workers install several layers outside the inner isolation plate according to the outer diameter of the cast-in-place pile, until the outer diameter of the circular plate formed by the several layers of expansion rings and the inner isolation plate is the same as the outer diameter of the cast-in-place pile to be constructed. The installation of expansion rings increases the applicability of the construction device, making it suitable for cast-in-place piles of more sizes.

[0018] Preferably, the clamping assembly includes a clamping head and a clamping screw. The outer side wall of the inner partition plate and the outer side wall of the expanding ring are respectively provided with feed holes. The feed holes communicate with the main rib through holes. The clamping screw is threaded into the main rib through hole on the inner side of the outermost expanding ring. The side wall of the clamping screw pushes the clamping head out of the outer side wall of the inner partition plate or the outer side wall of the expanding ring. The inner side wall of the expanding ring is provided with a limiting groove for accommodating the end of the clamping head.

[0019] By adopting the above technical solution, when several layers of expanding rings need to be fitted over the inner partition plate, the operator first places the expanding rings over the inner partition plate, ensuring that the upper and lower surfaces of the expanding rings are consistent with the upper and lower surfaces of the inner partition plate. Next, the operator tightens the clamping screws through the holes in the inner partition plate and the main ribs of the expanding rings on the inner side of the outermost expanding ring. When the clamping screws pass the clamping head, the side wall of the clamping screw pushes the clamping head out, causing the end of the clamping head to enter the limiting groove, thereby achieving the fitting between the expanding rings and the inner partition plate.

[0020] Preferably, the clamping head is provided with a rebound assembly, which includes an extension plate, a rebound spring, and a plug. The outer side wall of the inner isolation plate and the outer side wall of the expanding ring are respectively provided with receiving holes. The inner side wall of the receiving hole is provided with a through hole communicating with the feed hole. The extension plate is fixedly connected to the clamping head. The extension plate enters the receiving hole after passing through the through hole. The plug is threadedly connected to the opening of the receiving hole. The rebound spring is located between the plug and the extension plate.

[0021] By adopting the above technical solution, as the clamping head enters the limiting groove, the extension plate gradually moves towards the hole plug, and the rebound spring is compressed and acquires elastic potential energy. When construction is completed and the expansion ring needs to be removed, the worker rotates the clamping screw in the opposite direction so that the clamping screw is above the clamping head. At this time, the elastic potential energy of the rebound spring is released, causing the clamping head to fully enter the receiving hole, thereby releasing the locking of the expansion ring.

[0022] Preferably, the outer sleeve has a drain hole extending through its axial direction on its side wall.

[0023] By employing the above-mentioned technical solution, after pouring concrete into the pile hole, workers withdraw the guide pipe and insert a vibrator into the pile hole to compact the concrete, thereby improving the density of the pile. However, after vibration, the surface layer (i.e., the pile head) of the concrete has poor compaction. At this point, workers can introduce a drain pipe into the pile hole through the drain hole and then pump out the surface concrete. Next, workers reinsert the guide pipe for secondary pouring and secondary vibration to further improve the compaction of the pile head.

[0024] This application also provides a construction method for a drilled pile construction device that eliminates the need for pile head cutting, employing the following technical solution:

[0025] A construction method for a drilled cast-in-place pile construction device that eliminates the need for pile head cutting includes the following steps:

[0026] S1. Prefabrication device: Based on the outer diameter of the cast-in-place pile to be constructed, prefabricate the outer sleeve so that the inner diameter of the outer sleeve is equal to the outer diameter of the cast-in-place pile. At the same time, based on the inner diameter of the outer sleeve, determine the number of expansion rings. After connecting the expansion rings and the inner isolation plate as a whole, install them into the outer sleeve.

[0027] S2. Installation and Positioning: Use hoisting equipment to hoist the construction device to the pile hole of the cast-in-place pile, apply release agent to each concrete contact surface, and then slowly lower the device. During the lowering process, let the main bars of the steel cage pass through the corresponding main bar through holes in sequence. When the lower surface of the inner isolation plate reaches the design elevation of the cast-in-place pile, stop the lowering. At the same time, use the tightening components to clamp the main bars to fix the relative position between the construction device and the steel cage.

[0028] S3, One-time pouring: The grouting guide pipe is inserted into the pile hole of the grouting pile through the guide pipe through hole. When the guide pipe is lowered to the design position, the feeding component is used to make the sealing block move toward the center position of the inner isolation plate so that the two sealing blocks clamp the outer wall of the guide pipe.

[0029] S4. Vibrating concrete: Pull out the guide pipe and insert the vibrating equipment into the pile hole of the cast-in-place pile. The concrete is vibrated by the vibrating equipment to improve the compactness of the cast-in-place pile.

[0030] S5. Secondary pouring: Insert a drain pipe into the top of the pile hole through the drain hole to pump out the concrete with poor compaction in the top layer, and then repeat step S3 to perform secondary pouring.

[0031] S6. Pile head vibration: Pull out the guide pipe again and insert the vibration equipment into the pile head of the cast-in-place pile again to vibrate the concrete and improve the compactness of the pile head.

[0032] S7. Lifting off the device: After the concrete has hardened, use hoisting equipment to lift the device off the concrete.

[0033] By adopting the above technical solutions, on the one hand, the construction of bored piles using the construction device eliminates the need to break the pile head, thus improving the construction efficiency of bored piles. On the other hand, the combination of secondary pouring and secondary vibration solves the problem of poor compaction at the pile head of bored piles that do not require pile head breaking.

[0034] In summary, this application has the following beneficial technical effects:

[0035] 1. The inner isolation plate has a limiting function to ensure the pouring height of concrete. At the same time, the two sealing blocks sandwiched on the outer wall of the guide pipe also have a limiting function, reducing the amount of concrete overflowing through the hole of the guide pipe. This achieves the effect of eliminating the need to break the pile head of the bored pile and improves the construction efficiency of the bored pile.

[0036] 2. The expansion rings can be either not installed outside the inner isolation plate, or several layers can be installed outside the inner isolation plate, depending on the outer diameter of the cast-in-place pile. When the outer diameter of the cast-in-place pile to be constructed is the same as the outer diameter of the inner isolation plate, no expansion rings are installed outside the inner isolation plate. When the outer diameter of the cast-in-place pile to be constructed is larger than the outer diameter of the inner isolation plate, workers install several layers outside the inner isolation plate according to the outer diameter of the cast-in-place pile, until the outer diameter of the circular plate formed by the several layers of expansion rings and the inner isolation plate is the same as the outer diameter of the cast-in-place pile to be constructed. The installation of expansion rings increases the applicability of the construction device, making it suitable for cast-in-place piles of more sizes.

[0037] 3. On the one hand, the use of construction equipment for cast-in-place piles eliminates the need to break the pile head, improving the construction efficiency of bored cast-in-place piles. On the other hand, the combination of secondary pouring and secondary vibration solves the problem of poor compaction at the pile head of the non-destructible bored cast-in-place pile. Attached Figure Description

[0038] Figure 1 This is a cross-sectional view of the construction device for bored piles without cutting off the pile head, as shown in Example 1.

[0039] Figure 2 This is a schematic diagram illustrating the structure of the inner partition plate in Example 1.

[0040] Figure 3 This is a schematic diagram illustrating the structure of the outer jacket in Example 1.

[0041] Figure 4 This is a schematic diagram illustrating the structure of the expansion ring in Example 1.

[0042] Figure 5 This is embodied in Example 1. Figure 1Enlarged view of part A in the middle.

[0043] Figure 6 This is a schematic diagram illustrating the structure of the feeding component in Embodiment 1.

[0044] Figure 7 This is embodied in Example 1. Figure 1 Enlarged view of section B in the middle.

[0045] Explanation of reference numerals in the attached drawings: 1. Outer tube; 11. Sliding groove; 12. Slot; 13. Drain hole; 2. Inner partition plate; 21. Guide tube through hole; 22. Sliding port; 23. Sealing block; 231. Sealing rubber gasket; 24. Guide hole; 241. Large inner diameter section; 242. Small inner diameter section; 25. Reset sliding hole; 3. Expanding ring; 4. Slot; 41. Relief groove; 51. Feed head; 52. Connecting rod; 53. Feed rod; 61. Return spring; 62. Abutment plate; 63. Plug; 7. Main rib through hole; 81. Clamping head; 82. Clamping screw; 83. Feed hole; 84. Restriction groove; 85. Extension plate; 86. Rebound spring; 87. Hole plug; 88. Receiving hole; 89. Alignment groove; 891. Alignment ring; 91. Tightening sleeve; 911. Reduction in diameter; 92. Tightening nut; 93. External threaded tube. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0047] In order to achieve the effect of eliminating the need to break the pile head of bored cast-in-place piles and improve the construction efficiency of bored cast-in-place piles, this application discloses a construction device and construction method for bored cast-in-place piles that eliminates the need to cut the pile head.

[0048] Example 1

[0049] Reference Figure 1 This application discloses a construction device for bored piles without cutting off the pile head. The construction device for bored piles without cutting off the pile head includes an outer sleeve 1, an inner isolation plate 2, and an expansion ring 3.

[0050] Reference Figure 2 , Figure 3 , Figure 4 The inner isolation plate 2 is a circular plate, and the expansion ring 3 is a circular ring. The expansion ring 3 can be omitted from the outer side of the inner isolation plate 2 according to the outer diameter of the cast-in-place pile, or it can be set in several layers outside the inner isolation plate 2 according to the outer diameter of the cast-in-place pile. When the outer diameter of the cast-in-place pile to be constructed is the same as the outer diameter of the inner isolation plate 2, the expansion ring 3 is not set outside the inner isolation plate 2; when the outer diameter of the cast-in-place pile to be constructed is larger than the outer diameter of the inner isolation plate 2, the workers set several layers outside the inner isolation plate 2 according to the outer diameter of the cast-in-place pile, until the outer diameter of the circular plate formed by the several layers of expansion ring 3 and the inner isolation plate 2 is the same as the outer diameter of the cast-in-place pile to be constructed.

[0051] Reference Figure 1 and Figure 3 The outer tube 1 is a cylindrical structure open at both ends. Four sliding grooves 11 are formed along the axial direction on the inner wall of the outer tube 1. A retaining groove 12 is formed along the circumference of the inner wall of the outer tube 1. The groove 12 has one slot, and its depth is the same as the depth of the sliding grooves 11. The retaining groove 12 intersects with the sliding groove 11.

[0052] Reference Figure 1 and Figure 3 A locking block 4 is integrally formed on the outer wall of the inner partition plate 2 or the expanding ring 3. The locking block 4 is located near the bottom of the inner partition plate 2 or the expanding ring 3, and four locking blocks 4 are arranged along the circumference of the inner partition plate 2 or the expanding ring 3. The locking blocks 4 are arranged one-to-one with the sliding groove 11. During installation, the locking block 4 enters the locking groove 12 along the sliding groove 11. Then, the operator rotates the inner partition plate 2 or the expanding ring 3, so that the locking block 4 leaves the sliding groove 11 and enters the locking groove 12, thereby fixing the position of the inner partition plate 2 or the expanding ring 3 inside the outer tube 1.

[0053] When it is necessary to add an expansion ring 3 outside the inner isolation plate 2, the setting of the locking block 4 cannot achieve the fitting between the expansion ring 3 and the inner isolation plate 2. In order to facilitate the fitting, a relief groove 41 is opened on the inner side wall of the expansion ring 3 to accommodate the locking block 4. When the expansion ring 3 is fitted on the inner isolation plate 2, the locking block 4 is precisely embedded in the relief groove 41.

[0054] Reference Figure 1 and Figure 5 A conduit passage 21 is formed at the center of the inner partition plate 2. Two sliding ports 22 are formed on the inner wall of the conduit passage 21, facing each other. A sealing block 23 slides within each sliding port 22. The opposing sidewalls of the two sealing blocks 23 are arc-shaped to accommodate the arc-shaped outer wall of the conduit. Sealing rubber gaskets 231 are fixedly connected to the opposing sidewalls of the two sealing blocks 23. Several guide holes 24 are formed on the upper surface of the inner partition plate 2, communicating with the sliding ports 22. Feeding components are provided within the guide holes 24 to move the sealing blocks 23 towards the center of the inner partition plate 2 (for clarity, only two sets of feeding components are shown in the accompanying drawings; the others are not shown).

[0055] During construction, workers use hoisting equipment to lift the construction device onto the pile hole of the cast-in-place pile, and then slowly lower the device. Lowering stops when the lower surface of the inner isolation plate 2 or the circular plate composed of the inner isolation plate 2 and the expansion ring 3 reaches the design elevation of the cast-in-place pile. Next, workers insert the grouting guide pipe into the pile hole through the guide pipe through hole 21. When the guide pipe reaches the design position, the feeding assembly moves the sealing block 23 towards the center of the inner isolation plate 2, so that the two sealing blocks 23 clamp the outer wall of the guide pipe.

[0056] Then, concrete is poured into the pile hole through the guide pipe. During the concrete pouring process, the inner isolation plate 2 or the circular plate composed of the inner isolation plate 2 and the expansion ring 3 has a limiting effect to ensure the pouring height of the concrete. At the same time, the two sealing blocks 23 sandwiched on the outer wall of the guide pipe also have a limiting effect, reducing the amount of concrete overflowing through the hole 21 of the guide pipe. This achieves the effect of avoiding the destruction of the pile head of the bored pile and improves the construction efficiency of the bored pile.

[0057] Reference Figure 5 and Figure 6 The feed assembly includes a feed head 51, a connecting rod 52, and a feed rod 53.

[0058] Reference Figure 5 and Figure 6 The guide hole 24 includes a large inner diameter section 241 and a small inner diameter section 242. The inner diameter of the large inner diameter section 241 is larger than that of the small inner diameter section 242. The large inner diameter section 241 and the small inner diameter section 242 are interconnected and are arranged sequentially from top to bottom. The feed head 51 is elliptical, and its upper part is located in the large inner diameter section 241. The feed head 51 can move freely up and down within the large inner diameter section 241.

[0059] Reference Figure 5 and Figure 6 The lower part of the feed head 51 enters the sliding port 22, and the side wall of the feed head 51 contacts the side wall of the sealing block 23 away from the center of the inner partition plate 2. The connecting rod 52 is fixedly connected to the feed head 51. The lower part of the connecting rod 52 is located in the large inner diameter section 241, and the upper part of the connecting rod 52 is located in the small inner diameter section 242. The outer side wall of the connecting rod 52 is in contact with the inner side wall of the small inner diameter section 242, and the connecting rod 52 can move freely up and down in the small inner diameter section 242.

[0060] Reference Figure 5 and Figure 6 The feed rod 53 is rotatably connected to the connecting rod 52. The lower part of the feed rod 53 is located inside the small inner diameter section 242, and the upper part of the feed rod 53 extends out of the upper surface of the inner partition plate 2. The outer side wall of the feed rod 53 is provided with external threads, and the inner side wall of the small inner diameter section 242 is provided with internal threads. The feed rod 53 is threadedly engaged with the inner side wall of the guide hole 24.

[0061] Reference Figure 1 and Figure 5 A reset assembly is provided on the sealing block 23, which includes a reset spring 61, an abutment plate 62, and a plug 63.

[0062] Reference Figure 5 A reset sliding hole 25 is formed on the inner wall of the conduit passage hole 21, located above the sliding port 22. A connecting hole communicating with the sliding port 22 is formed on the inner wall of the reset sliding hole 25, with one end near the bottom of the reset sliding hole 25 and the other end extending through to the opening of the reset sliding hole 25. An abutment plate 62 is fixedly connected to the sealing block 23, and after passing through the connecting hole, the abutment plate 62 enters the reset sliding hole 25. A plug 63 is threadedly connected to the opening of the reset sliding hole 25, and a reset spring 61 is located between the plug 63 and the abutment plate 62.

[0063] After the conduit passes through the conduit through hole 21 and is fixed in place, the operator rotates the feed rod 53. The threaded engagement between the feed rod 53 and the inner wall of the guide hole 24 causes the feed rod 53 to move downward. During the downward movement of the feed rod 53, the feed rod 53 causes the connecting rod 52 to drive the feed head 51 to move downward. Since the feed head 51 is elliptical, the sealing block 23 that contacts the feed head 51 gradually extends out from the sliding port 22 until the sealing rubber pads 231 on both sides of the sealing block 23 are tightly attached to the outer wall of the conduit, thereby achieving clamping of the conduit.

[0064] As the sealing block 23 gradually extends from the sliding port 22, the abutment plate 62 gradually moves towards the plug 63, and the reset spring 61 is compressed and gains elastic potential energy. When the conduit is filled, the operator rotates the feed rod 53 in the opposite direction, causing the feed rod 53 to move upward, which in turn causes the connecting rod 52 to drive the feed head 51 upward. At this time, the elastic potential energy of the reset spring 61 is released, causing the end of the sealing block 23 near the inner isolation plate 2 to fully enter the sliding port 22, thereby releasing the clamping of the sealing block 23 on the conduit and making it easier for the operator to pull out the conduit.

[0065] Reference Figure 1 and Figure 7 The inner partition plate 2 and the expanding ring 3 each have several main rib through holes 7 along their circumference, with the main rib through holes 7 on the inner partition plate 2 positioned close to its edge. The outer walls of the inner partition plate 2 and the expanding ring 3 are respectively provided with clamping components (for clarity, only two sets of feeding components are shown in the accompanying drawings; the others are not shown). When the expanding ring 3 needs to be fitted over the inner partition plate 2, the clamping components enable a detachable connection between the inner partition plate 2 and the outer expanding ring 3.

[0066] Reference Figure 1 and Figure 7The clamping assembly includes a clamping head 81 and a clamping screw 82.

[0067] Reference Figure 7 The outer walls of the inner partition plate 2 and the outer walls of the expansion ring 3 are respectively provided with feed holes 83, which correspond one-to-one with the main rib through holes 7 and are connected to each other. The clamping screw 82 is threaded into the main rib through hole 7 on the inner side of the outermost expansion ring 3. The side wall of the clamping screw 82 pushes the clamping head 81 out of the outer wall of the inner partition plate 2 or the outer wall of the expansion ring 3. The inner side wall of the expansion ring 3 is provided with a limiting groove 84 for accommodating the end of the clamping head 81. In addition, in order to facilitate the passage of the clamping screw 82 through the clamping head 81, the end of the clamping screw 82 is set to be conical, and the end of the clamping head 81 facing the main rib through hole 7 is set to be round.

[0068] Reference Figure 7 The clamping head 81 is equipped with a rebound assembly, which includes an extension plate 85, a rebound spring 86, and a hole plug 87.

[0069] Reference Figure 7 The inner partition plate 2 and the outer wall of the expanding ring 3 each have a receiving hole 88, which is located above the feed hole 83. The inner wall of the receiving hole 88 has a through hole communicating with the feed hole 83, with one end near the bottom of the receiving hole 88 and the other end extending to the opening of the receiving hole 88. An extension plate 85 is fixedly connected to the clamping head 81. The extension plate 85 passes through the through hole and enters the receiving hole 88. A plug 87 is threaded into the opening of the receiving hole 88, and a rebound spring 86 is located between the plug 87 and the extension plate 85.

[0070] When several layers of expanding rings 3 need to be fitted over the inner partition plate 2, the operator first fits the expanding rings 3 over the inner partition plate 2, ensuring that the upper and lower surfaces of the expanding rings 3 are aligned with the upper and lower surfaces of the inner partition plate 2. Next, the operator tightens the clamping screw 82 through the hole 7 on the inner partition plate 2 and the main rib of the expanding ring 3 on the inner side of the outermost expanding ring 3. When the clamping screw passes the clamping head 81, the side wall of the clamping screw 82 pushes the clamping head 81 out, causing the end of the clamping head 81 to enter the limiting groove 84, thus achieving the fitting between the expanding ring 3 and the inner partition plate 2.

[0071] As the clamping head 81 enters the limiting groove 84, the extension plate 85 gradually moves towards the plug 87, and the rebound spring 86 is compressed and gains elastic potential energy. When it is necessary to remove the expanding ring 3, the operator rotates the clamping screw 82 in the opposite direction so that the clamping screw 82 is above the clamping head 81. At this time, the elastic potential energy of the rebound spring 86 is released, causing the clamping head 81 to fully enter the receiving hole 88, thereby releasing the locking of the expanding ring 3.

[0072] Reference Figure 1In addition, to align the upper and lower surfaces of the expansion ring 3 with the upper and lower surfaces of the inner partition plate 2, alignment grooves 89 are formed on the upper surfaces of the inner partition plate 2 and the expansion ring 3, with the alignment grooves 89 located near the edges of the inner partition plate 2 and the expansion ring 3. An alignment ring 891 is provided on the inner sidewall of the expansion ring 3, located at the top of the expansion ring 3 and flush with the upper surface of the expansion ring 3.

[0073] Reference Figure 1 A tightening assembly is provided on the main reinforcement through hole 7 (for clarity of the attached drawings, only two sets of feed assemblies are shown in the attached drawings, and the rest are not shown). The tightening assembly includes a tightening sleeve 91 and a tightening nut 92.

[0074] Reference Figure 1 A threaded pipe 93 is fixedly connected to the opening of the main reinforcement through hole 7. A tightening sleeve 91 is threaded onto the threaded pipe 93, thus connecting the tightening sleeve 91 to the opening of the main reinforcement through hole 7. A reduction diameter orifice 911 is formed on the pipe wall of the tightening sleeve 91 away from the main reinforcement through hole 7, with several reduction diameter orifices 911 along the circumference of the tightening sleeve 91. An external thread is provided on the outer wall of the tightening sleeve 91, and a tightening nut 92 is threaded onto the outside of the tightening sleeve 91.

[0075] When no expansion ring 3 is needed, the tightening assembly is installed on each of the main reinforcement through holes 7 of the inner isolation plate 2; when an expansion ring 3 is needed, the tightening assembly is installed on each of the outermost main reinforcement through holes 7. During operation, each main reinforcement of the steel cage passes through the corresponding main reinforcement through hole 7 in sequence, and then the operator rotates the tightening nut 92. As the tightening nut 92 moves upward, the tightening sleeve 91 gradually closes until the tightening sleeve 91 clamps the main reinforcement, thereby fixing the position between the device and the steel cage in this embodiment of the application.

[0076] Reference Figure 1 Two drainage holes 13 are axially extending along the side wall of the outer casing 1. After pouring concrete into the pile hole, the workers pull out the guide pipe and insert a vibrator into the pile hole to compact the concrete and improve its density. However, after vibration, the surface layer (i.e., the pile head) of the concrete has poor density. At this point, the workers can introduce a drainage pipe into the pile hole through the drainage holes 13 and then pump out the surface concrete. Next, the workers reinsert the guide pipe for secondary pouring and vibration to further improve the density of the pile head.

[0077] Example 2

[0078] This application provides a construction method for a drilled pile construction device that eliminates the need for pile head cutting, the steps of which are as follows:

[0079] S1. Prefabrication device: Based on the outer diameter of the cast-in-place pile to be constructed, prefabricate the outer sleeve 1 so that the inner diameter of the outer sleeve 1 is equal to the outer diameter of the cast-in-place pile. At the same time, based on the inner diameter of the outer sleeve 1, determine the number of expansion rings 3. After connecting the expansion rings 3 and the inner isolation plate 2 together through the clamping assembly, install them into the outer sleeve 1.

[0080] S2. Installation and Positioning: Using hoisting equipment, the device installed in S1 is hoisted to the pile hole of the cast-in-place pile. Release agent is applied to each concrete contact surface of the construction device. Then, the construction device is slowly lowered. During the lowering process, the main bars of the steel cage are passed through the corresponding main bar through hole 7 in sequence. When the lower surface of the inner isolation plate 2 reaches the design elevation of the cast-in-place pile, the lowering is stopped. At the same time, the main bars are clamped with tightening components to fix the relative position between the construction device and the steel cage.

[0081] S3, One-time pouring: The grouting guide pipe is inserted into the pile hole of the grouting pile through the guide pipe through hole 21. When the guide pipe is lowered to the design position, the feeding component is used to make the sealing block 23 move toward the center position of the inner isolation plate 2 so that the two sealing blocks 23 clamp the outer wall of the guide pipe.

[0082] S4. Vibrating concrete: Pull out the guide pipe and insert the vibrating equipment into the pile hole of the cast-in-place pile. The concrete is vibrated by the vibrating equipment to improve the compactness of the cast-in-place pile.

[0083] S5. Secondary pouring: Insert a drain pipe into the top of the pile hole through the drain hole 13 to pump out the concrete with poor compaction in the top layer, and then repeat the steps of S3 to perform secondary pouring.

[0084] S6. Pile head vibration: Pull out the guide pipe again and insert the vibration equipment into the pile head of the cast-in-place pile again to vibrate the concrete and improve the compactness of the pile head.

[0085] S7. Lifting device: After the concrete has hardened, the device will be lifted away using hoisting equipment.

[0086] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction device for bored cast-in-place piles without pile head cutting, comprising an outer sleeve (1) and an inner isolation plate (2), wherein the inner isolation plate (2) is detachably connected inside the outer sleeve (1), the inner isolation plate (2) is a circular plate, a guide pipe through hole (21) is provided at the center of the inner isolation plate (2), and a main reinforcement through hole (7) is provided near the edge of the inner isolation plate (2), wherein a plurality of main reinforcement through holes (7) are provided along the circumference, characterized in that: The guide tube has a sliding port (22) on its inner sidewall through the hole (21). There are two sliding ports (22) facing each other. A sealing block (23) slides in each sliding port (22). The inner isolation plate (2) has several guide holes (24). The guide holes (24) communicate with the sliding ports (22). The guide holes (24) are provided with a feeding component to make the sealing block (23) move toward the center of the inner isolation plate (2). The construction device for the non-cut pile head type bored cast-in-place pile also includes an expansion ring (3). The expansion ring (3) can be set in several layers outside the inner isolation plate (2) according to the outer diameter of the cast-in-place pile. The main reinforcement through the hole (7) has several openings along the circumference of the expansion ring (3). The outer sidewall of the inner isolation plate (2) and the outer sidewall of the expansion ring (3) are respectively provided with abutting components.

2. The construction device for bored piles without pile head cutting according to claim 1, characterized in that: The feeding assembly includes a feeding head (51), a connecting rod (52), and a feeding rod (53). The feeding head (51) is elliptical, and the sidewall of the feeding head (51) contacts the sidewall of the sealing block (23) away from the center of the inner isolation plate (2). The connecting rod (52) is fixedly connected to the feeding head (51), and the feeding rod (53) is rotatably connected to the connecting rod (52). The feeding rod (53) extends out of the surface of the inner isolation plate (2) after passing through the guide hole (24), and the feeding rod (53) is threadedly engaged with the inner sidewall of the guide hole (24).

3. The construction device for bored piles without pile head cutting according to claim 2, characterized in that: The sealing block (23) is provided with a reset assembly, which includes a reset spring (61), an abutment plate (62), and a plug (63). The inner wall of the conduit through hole (21) has a reset sliding hole (25). The inner wall of the reset sliding hole (25) has a connecting hole that communicates with the sliding port (22). The abutment plate (62) is fixedly connected to the sealing block (23). The abutment plate (62) enters the reset sliding hole (25) after passing through the connecting hole. The plug (63) is threadedly connected to the opening of the reset sliding hole (25). The reset spring (61) is located between the plug (63) and the abutment plate (62).

4. The construction device for bored piles without pile head cutting according to claim 1, characterized in that: The main reinforcement through hole (7) is provided with a tightening component, which includes a tightening sleeve (91) and a tightening nut (92). The tightening sleeve (91) is threaded to the opening of the main reinforcement through hole (7). The tightening sleeve (91) has a reduced diameter opening (911) on the tube wall away from the main reinforcement through hole (7). Several reduced diameter openings (911) are opened along the circumference of the tightening sleeve (91). The outer side wall of the tightening sleeve (91) is provided with an external thread. The tightening nut (92) is threaded to the outside of the tightening sleeve (91).

5. The construction device for bored piles without pile head cutting according to claim 1, characterized in that: The clamping assembly includes a clamping head (81) and a clamping screw (82). The outer side wall of the inner partition plate (2) and the outer side wall of the expansion ring (3) are respectively provided with feed holes (83). The feed holes (83) are connected to the main rib through hole (7). The clamping screw (82) is threaded into the main rib through hole (7) on the inner side of the outermost expansion ring (3). The side wall of the clamping screw (82) pushes the clamping head (81) out of the outer side wall of the inner partition plate (2) or the outer side wall of the expansion ring (3). The inner side wall of the expansion ring (3) is provided with a limiting groove (84) for accommodating the end of the clamping head (81).

6. The construction device for bored piles without pile head cutting according to claim 5, characterized in that: The clamping head (81) is provided with a rebound assembly, which includes an extension plate (85), a rebound spring (86), and a plug (87). The outer side wall of the inner isolation plate (2) and the outer side wall of the expansion ring (3) are respectively provided with receiving holes (88). The inner side wall of the receiving hole (88) is provided with a through hole communicating with the feed hole (83). The extension plate (85) is fixedly connected to the clamping head (81). The extension plate (85) enters the receiving hole (88) after passing through the through hole. The plug (87) is threadedly connected to the opening of the receiving hole (88). The rebound spring (86) is located between the plug (87) and the extension plate (85).

7. The construction device for bored piles without pile head cutting according to claim 1, characterized in that: The outer sleeve (1) has a drain hole (13) extending through its axial direction on the side wall.

8. A construction method for a drilled cast-in-place pile construction device without pile head cutting according to claim 7, characterized in that, Includes the following steps: S1. Prefabrication device: Based on the outer diameter of the cast-in-place pile to be constructed, prefabricate the outer sleeve (1) so that the inner diameter of the outer sleeve (1) is equal to the outer diameter of the cast-in-place pile. At the same time, based on the inner diameter of the outer sleeve (1), determine the number of expansion rings (3). After connecting the expansion rings (3) and the inner isolation plate (2) as a whole, install them into the outer sleeve (1). S2. Installation and positioning: The construction device is hoisted to the pile hole of the cast-in-place pile using hoisting equipment, and release agent is applied to each concrete contact surface. Then the device is slowly lowered. During the lowering process, the main bars of the steel cage are passed through the corresponding main bar through hole (7) in sequence. When the lower surface of the inner isolation plate (2) reaches the design elevation of the cast-in-place pile, the lowering is stopped. At the same time, the main bars are clamped using tightening components to fix the relative position between the construction device and the steel cage. S3, One-time pouring: The grouting conduit is inserted into the pile hole of the grouting pile through the conduit through hole (21). When the conduit is lowered to the design position, the feeding component is used to make the sealing block (23) move toward the center position of the inner isolation plate (2) so that the two sealing blocks (23) clamp the outer wall of the conduit. S4. Vibrating concrete: Pull out the guide pipe and insert the vibrating equipment into the pile hole of the cast-in-place pile. The concrete is vibrated by the vibrating equipment to improve the compactness of the cast-in-place pile. S5. Secondary pouring: Insert the drain pipe into the top of the pile hole through the drain hole (13) to pump out the concrete with poor compaction in the top layer, and then repeat the steps of S3 to perform secondary pouring. S6. Pile head vibration: Pull out the guide pipe again and insert the vibration equipment into the pile head of the cast-in-place pile again to vibrate the concrete and improve the compactness of the pile head. S7. Lifting device: After the concrete has hardened, the device will be lifted away using hoisting equipment.

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