Hydraulic splitting breaking construction device and process for composite casing pipe with built-in pile head

Abstract

The invention discloses a pile head built-in composite sleeve hydraulic splitting breaking construction device and process, and relates to the technical field of building construction.The pile head built-in composite sleeve hydraulic splitting breaking construction device comprises a cast-in-place pile body and a cast-in-place pile head, the cast-in-place pile head is detachably installed at the top end of the cast-in-place pile body through a splitting steel wedge, and annular grooves are formed in the elevation positions of the cast-in-place pile body and the cast-in-place pile head; a hydraulic breaking mechanism used for limiting movement of the splitting steel wedges is further installed on the cast-in-place pile head through assembly screws, pile body main reinforcements penetrate through the cast-in-place pile body and the cast-in-place pile head in the axial direction, the ends, located in the cast-in-place pile head, of the pile body main reinforcements are sleeved with PVC sleeves, and pile body pile breaking holes distributed in the circumferential direction of the annular groove are formed in the cast-in-place pile body. In the using process, by presetting the pile body broken pile hole, the pile head broken pile hole and the clamping and positioning structure of the splitting steel wedge, the working procedure of drilling splitting holes on site in the prior art is omitted, and a drilling machine and an operator do not need to be additionally input.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a hydraulic splitting and breaking construction device and process for pile head embedded composite sleeve. Background Technology

[0002] Drilled piles are widely used as the core foundation form for infrastructure projects such as bridges and high-rise buildings due to their advantages such as reliable quality and strong adaptability to geological formations.

[0003] According to the "Technical Specification for Building Pile Foundations", in order to ensure the strength of the pile body concrete, the concrete at the top of the pile needs to be poured to 0.5 to 1.0m above the design elevation during the construction of cast-in-place piles (some projects even exceed the design elevation by 2 to 3m). This excess pile head needs to be removed before the subsequent construction of the pile cap or tie beam. At present, the industry has developed a variety of construction methods for pile head removal. Among them, the core principle of the sleeve isolation integral removal method is to place the isolation sleeve on the outside of the longitudinal main reinforcement at the pile head before the steel cage is lowered. After the pile body concrete is poured and cured to the design strength, the pile head is separated from the pile body by hydraulic splitting and other methods, and then the pile head is removed as a whole by lifting equipment.

[0004] When using the hydraulic splitting method to separate the pile body and pile head, the PVC plastic pipe is inserted into the surface of the exposed main reinforcement and sonic logging pipe of the reinforcing cage during the construction of cast-in-place piles. The pipe isolates the concrete at the pile head from the reinforcing steel. During the removal process, after circumferential cutting at the pile head elevation, multiple splitting holes are drilled symmetrically, and a hydraulic splitting machine is inserted to split the pile head and remove it as a whole. However, when splitting the pile body and pile head, splitting holes need to be drilled at the corresponding positions on the pile head as the working positions of the hydraulic splitting mechanism. The drilling process requires additional drilling equipment, and the splitting method is prone to causing uneven concrete splitting surfaces on the column body, requiring manual secondary repair. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a hydraulic splitting and breaking construction device and process for pile head with built-in composite sleeve. The problem to be solved is that when the pile body and pile head are separated by hydraulic splitting, a splitting hole needs to be drilled at the corresponding position on the pile head as the working position of the hydraulic splitting mechanism. The drilling process requires additional drilling equipment, and the splitting method is prone to causing uneven concrete splitting surface of the column body, which requires manual secondary repair.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic splitting and breaking construction device with a built-in composite sleeve in the pile head, comprising a cast-in-place pile body and a cast-in-place pile head. The cast-in-place pile head is disassembled and installed at the top of the cast-in-place pile body via a splitting steel wedge. The pile head of both the cast-in-place pile body and the cast-in-place pile head has an annular groove at an elevation. The cast-in-place pile head is also equipped with a hydraulic breaking mechanism for restricting the movement of the splitting steel wedge by mounting screws. The main reinforcement of the pile body is axially inserted through both the cast-in-place pile body and the cast-in-place pile head, and a PVC sleeve is fitted at one end of the main reinforcement of the pile body located in the cast-in-place pile head.

[0008] The cast-in-place pile body is provided with pile body break holes distributed around the annular groove in the circumferential direction. The cast-in-place pile body is also provided with pile body locking blocks and docking holes corresponding to the pile body break holes in the circumferential direction. The docking holes are located on the end of the cast-in-place pile body near the pile head, and the pile body break holes and docking holes are set in correspondence with each other.

[0009] The pile head is fixedly equipped with a lifting ring for hoisting. The bottom end of the pile head is provided with a split end that matches the top end of the pile body. A reinforcing ring is fixedly installed at one end of the split end that extends into the pile body. The split end is provided with a pile head break hole and a pile head locking block corresponding to the pile body break hole along its circumference. One end of the pile head locking block extends into the docking hole. The end of the split steel wedge that passes through the pile body break hole is located in the pile head break hole and is in contact with the reinforcing ring.

[0010] As a preferred embodiment of the hydraulic splitting and breaking construction device with built-in composite sleeve in the pile head described in this invention, the splitting steel wedge is provided with a first slot and a second slot that are adapted to the pile head locking block and the pile body locking block, respectively. The pile head locking block is U-shaped and has a through groove for the splitting steel wedge to pass through. The splitting steel wedge is installed in the overlapping pile body break hole and pile head break hole by engaging with the pile head locking block through the first slot and the pile head locking block through the second slot and the pile body locking block.

[0011] As a preferred embodiment of the hydraulic splitting and breaking construction device for the pile head with built-in composite sleeve described in this invention, wherein: a limiting wedge surface is provided at one end of the splitting steel wedge located outside the pile body break hole, and an anti-detachment protrusion integrally formed with the splitting steel wedge is fixedly installed on the limiting wedge surface, the anti-detachment protrusion being located outside the pile body break hole and abutting against and connected to the outer wall of the cast-in-place pile body.

[0012] As a preferred embodiment of the hydraulic splitting and breaking construction device for the pile head with built-in composite sleeve described in this invention, the hydraulic breaking mechanism includes an assembly end fixedly installed at one end of the grouting pile head away from the splitting end, and the assembly end has an assembly screw hole along its circumference that is threadedly connected to the assembly screw.

[0013] As a preferred embodiment of the hydraulic splitting and breaking construction device for the pile head with built-in composite sleeve described in this invention, the hydraulic breaking mechanism includes a hydraulic seat sleeved outside the grouting pile head. The hydraulic seat is disassembled and installed on the splitting end by means of mounting screws passing through mounting screw holes. A traction slide seat driven by a hydraulic breaking push rod is also provided in the hydraulic seat and above the splitting end. Splitting clamp arms corresponding to the splitting steel wedges are respectively hinged to the traction slide seat.

[0014] As a preferred embodiment of the hydraulic splitting and breaking construction device with built-in composite sleeve in the pile head described in this invention, the hydraulic base is provided with a clearance groove for traction sliding of the slide block, and the bottom end of the splitting clamp arm is provided with a wedge end that matches the limiting wedge surface.

[0015] As a preferred embodiment of the hydraulic splitting and breaking construction device for the pile head built-in composite sleeve described in this invention, the splitting clamp arm is further provided with a clamp arm guide groove corresponding to its shape, and the splitting clamp arm is also respectively equipped with a guide pin shaft adapted to the clamp arm guide groove, and the two ends of the guide pin shaft extend to the inner wall of the hydraulic seat respectively.

[0016] As a preferred embodiment of the hydraulic splitting and breaking construction device for the pile head with built-in composite sleeve described in this invention, the main reinforcement of the pile body and the PVC sleeve are sealed with waterproof tape.

[0017] A process for a hydraulic splitting and breaking construction device with a built-in composite sleeve in pile head, characterized by comprising the following steps:

[0018] Step 1: When the device is needed, firstly, during the processing stage of the cast-in-place pile reinforcement cage, place the PVC sleeve on the section of the main reinforcement of the pile corresponding to the head of the cast-in-place pile, and seal the gap between the two with waterproof tape.

[0019] Step two: The pre-positioning of the two is completed by the docking hole of the cast-in-place pile body and the pile head locking block of the split end of the cast-in-place pile head, so as to ensure that the split hole of the pile body and the split hole of the pile head are precisely aligned, and the split end extends into the interior of the cast-in-place pile body.

[0020] Step 3: Insert the splitting steel wedge into the overlapping pile body break hole and pile head break hole, and position it by engaging with the pile head locking block and pile body locking block through the first and second slots respectively. Then, use assembly screws to fix the hydraulic seat to the assembly end to ensure that the wedge end is in contact with the limiting wedge surface.

[0021] Step 4: Pour concrete for the cast-in-place pile. After the concrete has cured to the design strength, start the external hydraulic control system to drive the hydraulic breaking push rod to lift and lower the traction slide, causing the splitting clamp arm to swing and generate radial splitting force, which pushes the splitting steel wedge to split the cast-in-place pile head along the annular groove.

[0022] Step 5: Shut down the hydraulic control system, remove the splitting steel wedges, and use lifting rings to lift the entire grouting pile head away with lifting equipment to complete the pile head breaking operation.

[0023] In summary, the present invention has at least one of the following beneficial effects:

[0024] 1. This invention eliminates the need for on-site drilling of splitting holes in existing processes by pre-setting the pile body break hole, the pile head break hole, and the snapping steel wedge locking and positioning structure, thus eliminating the need for additional drilling rigs and operators.

[0025] 2. The present invention uses a pre-set weak stress surface in the annular groove, a reinforcing ring to evenly disperse the splitting force, and a guide pin to limit the swing angle of the splitting clamp arm, so that the grouting pile head is evenly split along the annular groove, ensuring that the splitting surface is flat and no manual secondary repair is required.

[0026] 3. The present invention effectively isolates the pile head concrete from the pile body main reinforcement by installing a PVC sleeve on the main reinforcement section of the pile body inside the grouting pile head and sealing the gap between the two with waterproof tape, preventing cement slurry from seeping in and causing the two to bond together. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is an exploded perspective view of the present invention;

[0030] Figure 3 This is a cross-sectional view of the present invention;

[0031] Figure 4 This is a structural diagram of the hydraulic breaking mechanism of the present invention;

[0032] Figure 5 This is a structural diagram of the traction slide and splitting clamp arm of the present invention.

[0033] Figure 6 This is a structural diagram of the filling pile head of the present invention;

[0034] Figure 7 This is a structural diagram of the cast-in-place pile of the present invention;

[0035] Figure 8 This is a structural diagram of the splitting steel wedge of the present invention;

[0036] Figure 9 For the present invention Figure 3 Enlarged structural diagram of part A.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Cast-in-place pile body; 11. Annular groove; 12. Pile body break hole; 121. Pile body locking block; 13. Butt joint hole; 2. Cast-in-place pile head; 21. Lifting ring; 22. Splitting end; 221. Reinforcing ring; 222. Pile head break hole; 223. Pile head locking block; 23. Assembly end; 231. Assembly screw hole; 3. Splitting steel wedge; 31. First locking groove; 32. Second locking groove; 33. Limiting wedge surface; 331. Anti-detachment protrusion; 4. Hydraulic breaking mechanism; 41. Hydraulic seat; 411. Avoidance groove; 42. Hydraulic breaking push rod; 421. Traction slide; 43. Splitting clamp arm; 431. Wedge surface end; 432. Clamp arm guide groove; 44. Guide pin shaft; 5. Assembly screw; 6. Main reinforcement of pile body; 61. PVC sleeve. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] This invention discloses a hydraulic splitting and breaking construction device and process for pile head embedded composite sleeve.

[0041] Example 1

[0042] Reference Figure 1-9This invention provides a hydraulic splitting and breaking construction device and process for pile head with built-in composite sleeve. The device includes a cast-in-place pile body 1 and a cast-in-place pile head 2. The pile head 2 is detached and installed at the top of the cast-in-place pile body 1 via a splitting steel wedge 3. Both the pile head and the cast-in-place pile body 1 and the pile head 2 have annular grooves 11 at elevation points. A hydraulic breaking mechanism 4 for restricting the movement of the splitting steel wedge 3 is also installed on the pile head 2 via mounting screws 5. The main reinforcing bars 6 of the pile body 1 and the pile head 2 are axially penetrating each other, and a PVC sleeve 61 is fitted at one end of each main reinforcing bar 6 located in the pile head 2. A groove 1 surrounds the annular groove 11 on the pile body 1. The pile body 1 has pile body break holes 12 distributed around it. Around its circumference, there are also pile body locking blocks 121 and connecting holes 13 corresponding to the pile body break holes 12. The connecting holes 13 are located on the end of the pile body 1 closest to the pile head 2, and the pile body break holes 12 and connecting holes 13 are correspondingly arranged. A lifting ring 21 for hoisting is fixedly installed on the outside of the pile head 2. The bottom end of the pile head 2 has a split end 22 adapted to the top end of the pile body 1. A reinforcing ring 221 is fixedly installed at one end of the split end 22 extending into the pile body 1. Along its circumference, the split end 22 has pile head break holes 222 and pile head locking blocks 223 corresponding to the pile body break holes 12, and one end of the pile head locking block 223 extends into the connecting hole. In hole 13, one end of the splitting steel wedge 3, passing through the pile body break hole 12, is located in the pile head break hole 222 and is connected to the reinforcing ring 221. The cast-in-place pile body 1 is the main load-bearing structure of the device, and the cast-in-place pile head 2 is the over-filled and laitance part that needs to be broken. It is designed as a detachable structure and can be connected to the cast-in-place pile body 1 through the splitting steel wedge 3. The annular groove 11 is an embedded annular groove that is hidden inside when the cast-in-place pile head 2 is not hoisted. The hydraulic breaking mechanism 4 can be detachably installed through the mounting screws 5 and can restrict the axial and radial movement of the splitting steel wedge 3. The main reinforcement 6 of the pile body is the core load-bearing component of the pile body. The PVC sleeve 61 is sleeved on the main reinforcement section inside the cast-in-place pile head 2 and adopts a waterproof sealing design, which can effectively isolate the pile head concrete from the main reinforcement of the pile body. 6. When the pile body 1 and the pile head 2 are connected, the pile body 12 and the pile head 222 overlap to form the installation channel for the splitting steel wedge 3. The docking hole 13 can realize the pre-positioning of the pile body 1 and the pile head 2. The lifting ring 21 is welded and fixed to the outside of the pile head 2 with high-strength steel. Its bearing capacity matches the weight of the pile head 2. It is used for lifting and cleaning during the splitting and separation process of the pile head. The reinforcing ring 221 is welded and fixed with annular steel plate, which can improve the structural strength of the splitting end 22 and prevent the splitting end 22 from deforming during the splitting process. At the same time, it abuts against the splitting steel wedge 3 and can evenly distribute the splitting force transmitted by the steel wedge to the circumference of the splitting end 22, ensuring that the pile head is neatly separated along the annular groove 11.

[0043] The splitting steel wedge 3 is provided with a first slot 31 and a second slot 32 that are adapted to the pile head locking block 223 and the pile body locking block 121, respectively. The pile head locking block 223 is U-shaped and has a through groove for the splitting steel wedge 3 to pass through. The splitting steel wedge 3 is installed in the overlapping pile body break hole 12 and pile head break hole 222 by engaging with the pile head locking block 223 through the first slot 31 and the pile head locking block 223, and engaging with the pile body locking block 121 through the second slot 32. The splitting steel wedge 3 is made of high-strength alloy steel and has good compressive and shear resistance, and can withstand the huge splitting force transmitted by the hydraulic breaking mechanism 4. The first slot 31 and the second slot 32 are respectively opened on both sides of the splitting steel wedge 3. The size and shape of the slots are adapted to the pile head locking block 223 and the pile body locking block 121. The body locking block 121 is fully compatible. Through the locking connection under the action of gravity, it can realize the bidirectional positioning of the splitting steel wedge 3 with the cast-in-place pile body 1 and the cast-in-place pile head 2. It can not only restrict the axial movement of the steel wedge, but also prevent radial displacement under the action of splitting force. The through groove of the pile head locking block 223 is slightly larger than the cross-sectional size of the splitting steel wedge 3, which facilitates the smooth insertion, installation and removal of the splitting steel wedge 3 when the cast-in-place pile head 2 is lifted. At the same time, the inverted U-shaped structure can form a ring-shaped limit for the splitting steel wedge 3 when the cast-in-place pile head 2 is connected, so that it can only slide along the radial limit of the cast-in-place pile head 2. The locking installation method does not require the use of additional fasteners, which is convenient for assembly and can greatly improve construction efficiency. Compared with the existing method of inserting steel wedges after drilling, no additional holes are required.

[0044] The splitting steel wedge 3 has a limiting wedge surface 33 at one end outside the pile break hole 12, and an anti-detachment protrusion 331 integrally formed with the splitting steel wedge 3 is fixedly installed on the limiting wedge surface 33. The anti-detachment protrusion 331 is located outside the pile break hole 12 and abuts against the outer wall of the cast-in-place pile body 1. The core function of the limiting wedge surface 33 is to convert the axial driving force transmitted by the hydraulic breaking mechanism 4 into radial splitting force, so as to realize the separation of the cast-in-place pile head 2 and the cast-in-place pile body 1. The anti-detachment protrusion 331 is integrally formed with the splitting steel wedge 3, which can effectively restrict the splitting steel wedge 3 from moving into the pile body.

[0045] The hydraulic breaking mechanism 4 includes an assembly end 23 fixedly installed at the end of the grouting pile head 2 away from the splitting end 22. The assembly end 23 has an assembly screw hole 231 along its circumference that is threadedly connected to the assembly screw 5. The assembly end 23 can provide a stable installation foundation for the hydraulic breaking mechanism 4, and through the assembly screw hole 231, it can be precisely matched with the assembly screw 5. The threaded connection method makes the connection firm, the disassembly convenient, and facilitates the reuse of the hydraulic breaking mechanism 4.

[0046] The hydraulic breaking mechanism 4 includes a hydraulic seat 41 sleeved on the outside of the grouting pile head 2. The hydraulic seat 41 is disassembled and installed on the splitting end 22 by mounting screws 5 passing through mounting screw holes 231. The hydraulic seat 41 and the upper part of the splitting end 22 are also provided with a traction slide 421 driven by a hydraulic breaking push rod 42. Splitting clamp arms 43 corresponding to the splitting steel wedges 3 are respectively hinged on the traction slide 421. After the hydraulic seat 41 is sleeved and installed, it fits tightly against the outer wall of the grouting pile head 2. The hydraulic breaking push rod 42 is hydraulically driven and connected to an external hydraulic control system, which can realize the precise extension and retraction of its piston rod. The traction slide 421 slides with the hydraulic seat 41 and can move up and down along the clearance groove 411 of the hydraulic seat 41 under the drive of the hydraulic breaking push rod 42. It converts the axial extension and retraction of the push rod into the swinging motion of the splitting clamp arms 43 and applies force to all the splitting steel wedges 3 to achieve uniform circumferential splitting of the pile head.

[0047] The hydraulic base 41 is provided with a clearance groove 411 for the lifting and sliding of the traction slide 421. The bottom end of the splitting clamp arm 43 is provided with a wedge end 431 that is adapted to the limiting wedge surface 33. The clearance groove 411 can provide guidance and clearance space for the lifting and sliding of the traction slide 421 and the swinging of the splitting clamp arm 43. The inclination angle of the wedge end 431 is completely consistent with the limiting wedge surface 33 of the splitting steel wedge 3. After fitting, it can achieve surface contact to ensure that the splitting force is transmitted evenly.

[0048] The splitting clamping arm 43 is also provided with a clamping arm guide groove 432 corresponding to its shape, and the splitting clamping arm 43 is also equipped with a guide pin 44 that is adapted to the clamping arm guide groove 432. The two ends of the guide pin 44 extend to the inner wall of the hydraulic seat 41. When the splitting clamping arm 43 swings, the guide pin 44 can slide relative to the clamping arm guide groove 432, restricting the swing trajectory of the splitting clamping arm 43, ensuring that the clamping arm swings accurately corresponds to the limiting wedge surface 33 of the splitting steel wedge 3, and when it is in the vertical section, it limits the maximum swing angle of the splitting clamping arm 43 through its own dead point.

[0049] The main reinforcement 6 of the pile body and the PVC sleeve 61 are sealed with waterproof tape. The waterproof tape can effectively prevent cement slurry from seeping into the gap between the PVC sleeve 61 and the main reinforcement 6 of the pile body during the pouring of the cast-in-place pile, and ensure that the main reinforcement 6 of the pile body can be smoothly separated from the concrete on the cast-in-place pile head 2 when the pile head 2 is split and broken later.

[0050] When using this device to separate the pile body and pile head, the first step is to assemble before construction. During the processing of the cast-in-place pile reinforcement cage, the PVC sleeve 61 is fitted onto the section of the main reinforcement 6 of the pile body corresponding to the cast-in-place pile head 2, and the gap between the two is sealed with waterproof tape to isolate the concrete of the cast-in-place pile head 2 from the main reinforcement 6 of the pile body. Then, the cast-in-place pile body 1 and the cast-in-place pile head 2 are connected. The connection hole 13 of the cast-in-place pile body 1 is matched with the pile head locking block 223 of the split end 22 of the cast-in-place pile head 2 to complete the pre-positioning of the two and ensure that the pile body break hole 12 of the cast-in-place pile body 1 and the pile head break hole 222 of the cast-in-place pile head 2 are precisely aligned to form the installation channel of the splitting steel wedge 3. At the same time, the split end 22 extends into the interior of the cast-in-place pile body 1, and the reinforcing ring 221 at its end is in the preset stress position.

[0051] The splitting steel wedge 3 is inserted into the overlapping pile body break hole 12 and pile head break hole 222. Using the first slot 31 and the second slot 32 on both sides, it is gravity-locked with the pile head locking block 223 and the pile body locking block 121 respectively, completing the bidirectional positioning of the splitting steel wedge 3 and restricting its axial and radial movement. At the same time, one end of the splitting steel wedge 3 abuts against the reinforcing ring 221, and the anti-dislodgement protrusion 331 at the other end abuts tightly against the outer wall of the grouting pile body 1 to prevent the steel wedge from falling into the pile body. Then, by using the assembly screw 5, the hydraulic seat 41 of the hydraulic breaking mechanism 4 is fixed to the assembly end 23 of the grouting pile head 2 to ensure that the hydraulic seat 41 is tightly fitted with the outer wall of the grouting pile head 2, and the wedge end 431 at the bottom of the splitting clamp arm 43 is precisely fitted with the limiting wedge surface 33 of the splitting steel wedge 3 to restrict the movement of the splitting steel wedge 3.

[0052] After the overall assembly of the device is completed, the concrete pouring operation of the cast-in-place pile is carried out. At this time, the annular groove 11 is hidden inside the pile head as an embedded annular groove. The reinforcing ring 221 can enhance the structural strength of the splitting end 22. When the pile body concrete is cured to the design strength and the pile head needs to be broken, the external hydraulic control system is activated to drive the hydraulic breaking push rod 42 of the hydraulic breaking mechanism 4 to extend and retract, and drive the traction slide 421 to move up and down along the clearance groove 411 of the hydraulic seat 41. The lifting motion of the traction slide 421 is converted into the swing motion of the splitting clamp arm 43 through the hinge connection. When the splitting clamp arm 43 swings, the guide pin 44 slides relative to the clamp arm guide groove 432 to ensure that the wedge end 431 is always tightly fitted with the limiting wedge surface 33 of the splitting steel wedge 3. At the same time, the axial driving force transmitted by the hydraulic push rod is converted into radial splitting force by the wedge surface mating structure, which acts on the splitting steel wedge 3.

[0053] The splitting steel wedge 3 transmits the radial splitting force to the reinforcing ring 221, and distributes it evenly to the circumference of the splitting end 22 of the grouting pile head 2 through the reinforcing ring 221. Combined with the pre-set weak stress surface of the annular groove 11, the grouting pile head 2 is evenly split along the annular groove 11, ensuring that the splitting surface is flat. In this process, when the guide pin 44 slides to the vertical section of the clamping arm guide groove 432, it limits the maximum swing angle of the splitting clamping arm 43 through its own dead point, avoiding overload damage to the pile body and ensuring its overall integrity.

[0054] After the pile head and pile body are split and separated, the hydraulic control system is turned off, the splitting steel wedge 3 is removed, and the entire pile head 2 is lifted away by hoisting equipment using the lifting ring 21 welded on the outside of the grouting pile head 2. The inverted U-shaped through groove of the pile head locking block 223 facilitates the simultaneous lifting and smooth removal of the splitting steel wedge 3, thus completing the pile head breaking operation. Furthermore, due to the isolation effect of the PVC sleeve 61, the main reinforcement 6 of the pile body can be smoothly separated from the pile head concrete without additional treatment.

[0055] A process for a hydraulic splitting and breaking construction device with a built-in composite sleeve in the pile head includes the following steps:

[0056] Step 1: When the device is needed, firstly, during the processing stage of the cast-in-place pile reinforcement cage, the PVC sleeve 61 is fitted onto the section of the main reinforcement 6 of the pile body corresponding to the cast-in-place pile head 2, and the gap between the two is sealed with waterproof tape.

[0057] Step 2: The pre-positioning of the two is completed by the cooperation of the docking hole 13 of the cast-in-place pile body 1 and the pile head locking block 223 of the split end 22 of the cast-in-place pile head 2, so as to ensure that the pile body break hole 12 and the pile head break hole 222 are precisely aligned, and the split end 22 extends into the interior of the cast-in-place pile body 1.

[0058] Step 3: Insert the splitting steel wedge 3 into the overlapping pile body break hole 12 and pile head break hole 222. The wedge is engaged and positioned with the pile head locking block 223 and the pile body locking block 121 through the first slot 31 and the second slot 32, respectively. Then, use the assembly screw 5 to fix the hydraulic seat 41 to the assembly end 23 to ensure that the wedge end 431 is in contact with the limiting wedge surface 33.

[0059] Step 4: Pour concrete for the cast-in-place pile. After the concrete has cured to the design strength, start the external hydraulic control system to drive the hydraulic breaking push rod 42 to lift and lower the traction slide 421, causing the splitting clamp arm 43 to swing and generate radial splitting force, which pushes the splitting steel wedge 3 to split the cast-in-place pile head 2 along the annular groove 11.

[0060] Step 5: Shut down the hydraulic control system, remove the splitting steel wedge 3, and use the lifting ring 21 to lift the entire grouting pile head 2 away with the hoisting equipment to complete the pile head breaking operation.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hydraulic splitting and demolition construction device with an embedded composite sleeve in the pile head, characterized in that: The pile includes a cast-in-place pile body (1) and a cast-in-place pile head (2). The cast-in-place pile head (2) is disassembled and installed on the top of the cast-in-place pile body (1) by means of a splitting steel wedge (3). The pile heads of the cast-in-place pile body (1) and the cast-in-place pile head (2) are provided with an annular groove (11) at the elevation. The cast-in-place pile head (2) is also equipped with a hydraulic breaking mechanism (4) for limiting the movement of the splitting steel wedge (3) by means of mounting screws (5). The main reinforcement bars (6) of the pile body (1) and the cast-in-place pile head (2) are both provided with a main reinforcement bar (6) through the axial direction. The main reinforcement bar (6) of the pile body is provided with a PVC sleeve (61) at one end of the cast-in-place pile head (2). The cast-in-place pile body (1) is provided with pile body break holes (12) distributed around the annular groove (11) in the circumferential direction. The cast-in-place pile body (1) is also provided with pile body locking blocks (121) and connecting holes (13) corresponding to the pile body break holes (12) in the circumferential direction. The connecting holes (13) are located on one end of the cast-in-place pile body (1) near the cast-in-place pile head (2), and the pile body break holes (12) and connecting holes (13) are arranged corresponding to each other. The grouting pile head (2) is fixedly installed with a lifting ring (21) for hoisting. The bottom end of the grouting pile head (2) is provided with a split end (22) that matches the top end of the grouting pile body (1). The split end (22) extends into the grouting pile body (1) and is fixedly installed with a reinforcing ring (221). The split end (22) is provided with a pile head break hole (222) and a pile head locking block (223) corresponding to the pile body break hole (12) along its circumference. One end of the pile head locking block (223) extends into the docking hole (13). The split steel wedge (3) passes through the pile body break hole (12) and is located in the pile head break hole (222), and is connected to the reinforcing ring (221).

2. The hydraulic splitting and breaking construction device for pile head embedded composite sleeve according to claim 1, characterized in that, The splitting steel wedge (3) is provided with a first slot (31) and a second slot (32) that are adapted to the pile head locking block (223) and the pile body locking block (121). The pile head locking block (223) is U-shaped and has a through slot for the splitting steel wedge (3) to pass through. The splitting steel wedge (3) is installed in the pile body broken pile hole (12) and the pile head broken pile hole (222) that overlap each other by engaging with the first slot (31) and the pile head locking block (223) and engaging with the second slot (32) and the pile body locking block (121).

3. The hydraulic splitting and breaking construction device for pile head embedded composite sleeve according to claim 2, characterized in that, The splitting steel wedge (3) has a limiting wedge surface (33) at one end outside the pile body break hole (12), and an anti-dislodgement protrusion (331) integrally formed with the splitting steel wedge (3) is fixedly installed on the limiting wedge surface (33). The anti-dislodgement protrusion (331) is located outside the pile body break hole (12) and abuts against the outer wall of the cast-in-place pile body (1).

4. The hydraulic splitting and breaking construction device for pile head embedded composite sleeve according to claim 1, characterized in that, The hydraulic breaking mechanism (4) includes an assembly end (23) fixedly installed at one end of the grouting pile head (2) away from the splitting end (22). The assembly end (23) has an assembly screw hole (231) that is threadedly connected to the assembly screw (5) along its circumference.

5. The hydraulic splitting and breaking construction device for pile head embedded composite sleeve according to claim 1, characterized in that, The hydraulic breaking mechanism (4) includes a hydraulic seat (41) sleeved outside the grouting pile head (2). The hydraulic seat (41) is disassembled and installed on the splitting end (22) by means of mounting screws (5) passing through mounting screw holes (231). The hydraulic seat (41) and above the splitting end (22) are also provided with a traction slide (421) driven by a hydraulic breaking push rod (42). The traction slide (421) is respectively hinged to a splitting clamp arm (43) corresponding to the splitting steel wedge (3).

6. The hydraulic splitting and breaking construction device for pile head embedded composite sleeve according to claim 5, characterized in that, The hydraulic base (41) is provided with a clearance groove (411) for lifting and sliding of the traction slide (421), and the bottom end of the splitting clamp arm (43) is provided with a wedge end (431) that is compatible with the limiting wedge surface (33).

7. The hydraulic splitting and breaking construction device for pile head embedded composite sleeve according to claim 5, characterized in that, The splitting clamping arm (43) is also provided with a clamping arm guide groove (432) corresponding to its shape, and the splitting clamping arm (43) is also provided with a guide pin (44) that is compatible with the clamping arm guide groove (432). The two ends of the guide pin (44) extend to the inner wall of the hydraulic seat (41).

8. The hydraulic splitting and breaking construction device for pile head embedded composite sleeve according to claim 1, characterized in that, The main reinforcement (6) of the pile body and the PVC sleeve (61) are sealed with waterproof tape.

9. A process for a hydraulic splitting and breaking construction device for pile head with built-in composite sleeve, applied to the hydraulic splitting and breaking construction device for pile head with built-in composite sleeve as described in claim 8, characterized in that: Includes the following steps: Step 1: When the device is needed, firstly, during the processing stage of the cast-in-place pile reinforcement cage, the PVC sleeve (61) is fitted onto the section of the main reinforcement (6) of the pile body corresponding to the cast-in-place pile head (2), and the gap between the two is sealed with waterproof tape. Step 2: The pre-positioning of the two is completed by the docking hole (13) of the cast-in-place pile body (1) and the pile head locking block (223) of the split end (22) of the cast-in-place pile head (2), ensuring that the pile body break hole (12) and the pile head break hole (222) are precisely aligned, so that the split end (22) extends into the interior of the cast-in-place pile body (1); Step 3: Insert the splitting steel wedge (3) into the overlapping pile body broken pile hole (12) and pile head broken pile hole (222), and use the first slot (31) and the second slot (32) to engage and position with the pile head locking block (223) and the pile body locking block (121) respectively. Then use the assembly screw (5) to fix the hydraulic seat (41) to the assembly end (23) to ensure that the wedge end (431) is in contact with the limiting wedge surface (33). Step 4: Pour concrete for the cast-in-place pile. After the concrete has cured to the design strength, start the external hydraulic control system to drive the hydraulic breaking push rod (42) to lift the traction slide (421), so that the splitting clamp arm (43) swings to generate radial splitting force, pushing the splitting steel wedge (3) to split the cast-in-place pile head (2) along the annular groove (11). Step 5: Shut down the hydraulic control system, remove the splitting steel wedge (3), and use the lifting ring (21) to lift the grouting pile head (2) as a whole through the hoisting equipment to complete the pile head breaking operation.

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