A pile head directional crack inducing device and breaking method

Abstract

The present application relates to pile head breaking technology field, provide a kind of pile head directional crack inducing device and breaking method, device includes mobile car body, bottom is provided with mobile wheel, front end movably sets up extension assembly, extension assembly front end movably sets up centering support assembly, mobile car body both sides are provided with limiting component, mobile car body is movably provided with feed assembly, feed assembly is provided with transposition component, transposition component is provided with hole forming assembly and slit forming assembly, can drive hole forming assembly and slit forming assembly transposition, mobile car body rear end is provided with water tank and mobile handle.The present application can reduce the labor intensity of construction personnel, improve the precision and efficiency of pile head hole, and set directional slit structure, can be opened in the hole in the pile head slit, improve the efficiency of construction, the practicability of device is good.

Description

Technical Field

[0001] This invention relates to the field of pile head demolition technology, specifically to a pile head directional crack induction device and demolition method. Background Technology

[0002] Concrete pile head breaking refers to the construction process in building engineering of removing the excess portion of the top of a concrete pile that exceeds the design elevation, using mechanical or manual methods. It typically employs equipment such as hydraulic breakers and pneumatic drills, or combines this with a circumferential cutting process to first cut and then break the pile, precisely controlling the breaking area and avoiding damage to the effective portion of the pile body. Its purpose is to provide a smooth interface for subsequent construction of foundations and other structures, while also facilitating the inspection of pile integrity and the quality of reinforcement anchorage.

[0003] Alternatively, static crushing technology can be used. Static crushing technology involves mixing a crushing agent into a slurry and injecting it into the borehole at the top of the pile. During the hydration reaction of the crushing agent, the volume expands and generates radial expansion pressure. Due to the low tensile strength of brittle materials such as concrete, cracks are generated and gradually develop until the structure breaks. This technology has a high level of safety.

[0004] When using static crushing technology, drilling is required in the pile body. The general drilling method is for workers to use hand-held drills. However, this method requires high skill from the workers, who need to maintain hand stability during drilling to avoid deviations. This results in lower construction quality and efficiency. Furthermore, when using static crushing technology, the direction of cracking within the hole is difficult to control, and cracks may extend downwards to the bottom of the pile head, causing a decline in the quality of the concrete pile. Therefore, it is necessary to control the development of cracks inside the pile head hole, determine the boundary of static splitting, and ensure that the pile head demolition is limited to a fixed elevation range. This requires the use of directional demolition.

[0005] Therefore, in order to address the above problems, a pile head directional crack induction device and demolition method are proposed to solve these problems. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by developing a directional crack induction device and demolition method for pile heads. This invention can reduce the labor intensity of construction workers, improve the accuracy and efficiency of pile head drilling, and, with its directional cracking structure, can create cracks in the holes drilled inside the pile head, thereby improving construction efficiency. The device is highly practical.

[0007] To achieve the above objectives, the present invention employs the following technical solution: A pile head directional crack induction device includes a mobile vehicle body with wheels at the bottom. An extension component is movably mounted at the front end of the vehicle body, and a centering support component is movably mounted at the front end of the extension component. The centering support component is used to contact the outer wall of the concrete pile head. Limiting components are mounted on both sides of the vehicle body. The limiting components are used to connect to the concrete pile head and, in conjunction with the centering support components, limit the relative position between the vehicle body and the pile head. A feeding component is movably mounted on the vehicle body, and a shifting component is mounted on the feeding component to drive the shifting component to move. The shifting component is equipped with an opening component and a cracking component, which can drive the opening component and the cracking component to shift positions. A water tank and a moving handle are mounted at the rear end of the vehicle body.

[0008] Preferably, the extension assembly includes an extension plate, an extension groove for accommodating the extension plate is formed on the mobile vehicle body, the extension plate is slidably disposed in the extension groove, and an extension screw is rotatably disposed in the extension groove along the sliding direction of the extension plate. One end of the extension screw passes through the mobile vehicle body and is connected to an extension power component, which is disposed on the mobile vehicle body. The extension screw is threadedly connected to the extension plate and can change its connection length with the extension plate by rotation. A limiting groove parallel to the axis of the extension screw is formed through one side of the extension groove, and a limiting pin is provided on the extension plate, which is slidably disposed in the limiting groove.

[0009] Preferably, the centering support assembly includes a bidirectional lead screw, which is rotatably mounted on the side of the extension plate away from the moving vehicle body. The axis of the bidirectional lead screw is horizontal to the ground and perpendicular to the sliding direction of the extension plate. The two ends of the bidirectional lead screw are symmetrically threaded to sliding seats. Rotating the bidirectional lead screw can adjust the distance between the sliding seats. Contact rollers are rotatably mounted on each sliding seat, and the contact rollers are used to contact the side wall of the pile head.

[0010] Preferably, the limiting assembly includes a roller and a support roller. The roller is rotatably mounted on the moving vehicle body, and its axis is perpendicular to the ground, i.e., parallel to the axis of the pile head. The roller is connected to a limiting power component, which is mounted on the moving vehicle body. A binding strap is wound around the roller, and a connector is provided at one end of the binding strap. The connectors on the binding straps of the limiting assemblies on both sides can be connected to each other for gripping the outer wall of the pile head. The support roller is rotatably mounted on the moving vehicle body, and its axis is parallel to the axis of the roller. It is used to contact the side of the binding strap away from the pile head and can support the binding strap to prevent friction between the binding strap and the moving vehicle body.

[0011] Preferably, the feeding assembly includes a movable seat, which is slidably mounted on the moving vehicle body with the sliding direction parallel to the sliding direction of the extension plate. The movable seat is threadedly connected to a feed screw, which is rotatably mounted on the moving vehicle body with its axis parallel to the sliding direction of the movable seat. One end of the feed screw is connected to a feeding power component, which is mounted on the moving vehicle body. A guide rod and a lifting screw are mounted on the movable seat, with their axes parallel to each other and perpendicular to the axis of the feed screw. The ends of the guide rod and the lifting screw furthest from the movable seat are connected via an upper top plate. A lifting power component is mounted on the upper top plate, with its output end connected to one end of the lifting screw. The lifting screw is rotatably mounted between the movable seat and the upper top plate.

[0012] Preferably, the shifting assembly includes a shifting seat, which is slidably mounted on the guide rod and threadedly connected to the lifting screw. A rotating plate is rotatably mounted on the shifting seat, and there is no contact between the rotating plate and the lifting screw. The rotating plate is connected to a rotational power component, which is mounted on the shifting seat and is used to drive the rotating plate to rotate.

[0013] Preferably, the rotating plate is L-shaped, with the corner of the L-shape rotatably mounted on the shifting seat. A driven gear is mounted on the rotating plate, with its axis colinear with the axis of rotation of the rotating plate, to drive the rotating plate to rotate. The driven gear meshes with the driving gear, which is located at the output end of the rotating power component.

[0014] Preferably, the hole-opening assembly includes a hole-opening power component, which is disposed at one end of the rotating plate. The output end of the hole-opening power component is connected to a drill bit, and the drill bit is replaceable. When opening a hole, the axis of the drill bit is located on the symmetrical plane of the sliding seats at both ends of the bidirectional lead screw.

[0015] Preferably, the slit-opening assembly includes a high-pressure water pump, the inlet of which is connected to a water tank, and the outlet of which is connected to a cutting head. A nozzle is installed on the cutting head, and the end of the nozzle away from the cutting head is connected to the nozzle. The water outlet direction of the nozzle is perpendicular to the length direction of the nozzle. The cutting head is detachably mounted on an angle adjustment sleeve, which is rotatably mounted on an angle mounting seat. The angle adjustment sleeve is connected to an angle adjustment power component, which is mounted on a rotating plate and used to drive the angle adjustment sleeve to rotate. The axis of rotation of the angle adjustment sleeve is perpendicular to the axis of the lifting screw. The angle mounting seat is located at the other end of the rotating plate. When opening the slit, the axis of the nozzle is located on the symmetrical plane of the sliding seats at both ends of the bidirectional screw. A support shaft is detachably installed at one end of the nozzle near the nozzle head, and the length of the support shaft is adjustable. The support shaft is located on the side of the nozzle away from the water outlet direction of the nozzle head.

[0016] The present invention also provides a method for directional breaking of pile heads, including the above-mentioned pile head directional crack induction device, and further including the following steps: Step 1: Laying out the hole positions. Based on the diameter of the pile head, lay out the line above the predetermined cutting position at the pile head height, and locate the opening positions on the side wall of the pile head. The axis of each opening is perpendicular to the axis of the pile head. Determine the number of holes according to the following formula. Where N is the number of holes, rounded up, D is the diameter of the pile head, and s is the distance between the outermost ends of adjacent holes. The higher the concrete strength grade, the smaller the value of s; Based on the calculated number of holes, the position of each hole is evenly positioned circumferentially on the sidewall of the pile head, without needing to avoid the position of the reinforcing cage inside the pile head. The hole diameter and depth are calculated based on the diameter of the pile head, where the hole diameter... And d is not less than 22 mm and not more than 40 mm, hole depth ; Step 2: Device positioning. Select the diameter and length of the drill bit according to the hole depth and diameter to be drilled, and install it on the output end of the drilling power unit. Then move the pile head directional crack induction device to one side of the pre-crushed pile head. Adjust the distance between the two contact rollers according to the diameter of the pile head so that the side wall of the pile head is in contact with the surface of the contact rollers. Then pull out the binding straps on both sides so that the binding straps on both sides wrap around the pile head from both sides to the rear side of the pile head. With the device position as the front side of the pile head, connect the binding straps on both sides through the connector. The limiting power unit tightens the binding straps so that the device is held on the pile head by the binding straps. Step 3: Drilling. Rotate the rotating plate so that the axis of the drill bit and the axis of the pile head are in the same plane and perpendicular to the axis of the pile head. Adjust the height of the drill bit so that the height of the drill bit axis is consistent with the height of the axis of the pre-drilled hole. Rotate the entire device to make the axis of the drill bit collinear with the axis of the pre-drilled hole. Adjust the extension of the extension plate according to the length of the drill bit so that the contact roller can always contact the side wall of the pile head. Then start the drilling power component and the feed power component to drill the hole in the side wall of the pile head. After drilling one hole, take out the core. First loosen the binding belt, then rotate the entire device to make the axis of the drill bit collinear with the axis of the next pre-drilled hole. Then tighten the binding belt and drill the hole at that position until all holes are drilled. Step 4: Opening the slot. Rotate the rotating plate so that the axis of the nozzle is in the same plane as the axis of the pile head, and the axis of the nozzle is perpendicular to the axis of the pile head. Adjust the height of the nozzle so that the height of the nozzle axis is consistent with the height of the opened hole axis. Then, adjust the length of the support shaft according to the hole diameter so that the distance from the end of the support shaft to the nozzle axis is half the hole diameter, which facilitates the contact and support of the support shaft with the inner wall of the hole. Start the feed power unit to insert the nozzle into the hole. Adjust the spray direction of the nozzle as needed. Then start the high-pressure water pump. The nozzle sprays high-pressure water. At the same time, the feed power unit drives the nozzle to move along the length of the hole to open an induction groove on the inner wall of the hole. The depth of the induction groove is not less than 2 mm. Open the induction groove in all holes in sequence to complete the opening. Step 5: Device relocation. Separate the connectors of the binding straps, retract the binding straps, and then move the device away from the pile head or to the next pre-treated pile head. Step Six: Clean the hole. Use a high-pressure blower to blow out excess water and concrete residue from the opening to ensure that there is no water or residue in the hole. Step 7: Prepare grout and fill holes. Mix calcium oxide and water in a mass ratio of 3:1 to form a grouting agent slurry. Then add 0.5% by volume of thickener. Mix the slurry evenly with a mixer. Then use a grouting gun with an extension pipe to inject grout into the hole. After the hole is grouted, use a sealing device to plug the hole opening. Step 8: Break the pile head. After the breaking agent expands and the pile head is broken, clean up the concrete blocks and remove the remaining small amount of pile head above the predetermined height using other methods, such as a small cutting machine, for precise removal, thus completing the pile head demolition.

[0017] The effects described in the invention are merely those of the embodiments, and not all the effects of the invention. The above technical solution has the following advantages: 1. This invention, by setting up a hole-opening component, can open a transverse hole at the pre-crushing position of the pile head. The hole-opening component is set on the feeding component and can move automatically up and down and back and forth, replacing the traditional hand-held equipment used by construction workers to open holes, reducing the labor intensity of workers and improving the efficiency of hole opening. 2. By setting a limiting component, the present invention can connect the device to the pile head, preventing the device from tipping over or changing position during drilling, thus affecting the accuracy of the drilling position. In addition, the limiting component, together with the centering support component, ensures that the device is always aligned with the axis of the pile head when drilling, improving the accuracy and stability of drilling. At the same time, the extension component is set up to replace the drill bit of different lengths with the drilling component, which can meet the drilling needs of pile heads of various diameters, making the device more practical. 3. By setting a slit-opening component, the present invention can open an inducing slit in the hole of the pile head, and the direction of the slit can be adjusted so that the crack extends in a specific direction when breaking, thereby improving the controllability of pile head breaking; and by setting a replacement component, which is equipped with a hole-opening component and a slit-opening component, it is used to change the position of the hole-opening component and the slit-opening component, so as to facilitate different processing of the pile head and improve the practicality of the device. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0019] Figure 1 This is a schematic diagram of the overall structure of the device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the device for removing the extension plate according to an embodiment of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the connection structure between the extension plate and the centering support assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the device for removing the extension plate according to an embodiment of the present invention. Figure 2 ; Figure 5 This is a schematic diagram illustrating the structure of the transposition component according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the angle mounting base and angle adjusting sleeve according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure where the rotating plate and the transposition seat are separated according to an embodiment of the present invention; Figure 8 This is a top view of the hole opened after the device of this invention is connected to the pile head in an embodiment of the invention; Figure 9 This is a top view schematic diagram of the device of the present invention after it is connected to the pile head and then the slot is opened; Figure 10 This is a schematic diagram illustrating the direction of the single-layer hole and the induced groove on the pile head according to an embodiment of the present invention; Figure 11 This is a schematic diagram illustrating the direction of the double-layered holes and induced grooves on the pile head according to an embodiment of the present invention. Figure 12 This is a schematic diagram of the three layers of holes and the direction of the induced groove on the pile head, according to an embodiment of the present invention.

[0020] In the diagram: 1. Moving vehicle body; 2. Extension assembly; 3. Centering support assembly; 4. Limiting assembly; 5. Feeding assembly; 6. Positioning assembly; 7. Opening assembly; 8. Slotting assembly; 9. Water tank; 10. Moving handle; 11. Moving wheel; 12. Extension groove; 13. Limiting groove; 14. Pile head; 15. Hole; 16. Induction groove; 21. Extension plate; 22. Extension screw; 23. Limiting pin; 31. Bidirectional screw; 32. Sliding seat; 33. Contact roller; 41. Winding roller; 42. Support roller; 43. Limiting power component. ; 44. Restraint belt; 45. Connector; 51. Moving seat; 52. Feed screw; 53. Feed power component; 54. Guide rod; 55. Lifting screw; 56. Top plate; 57. Lifting power component; 61. Shifting seat; 62. Rotating plate; 63. Rotation power component; 64. Driven gear; 65. Driving gear; 71. Drilling power component; 72. Drill bit; 81. Cutting head; 82. Nozzle; 83. Nozzle; 84. Angle adjustment sleeve; 85. Angle mounting seat; 86. Angle adjustment power component; 87. Support shaft. Detailed Implementation

[0021] 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.

[0022] Example 1 like Figures 1-7 As shown, a pile head directional crack induction device includes a mobile vehicle body 1. The bottom of the mobile vehicle body 1 is equipped with casters 11, which are omnidirectional. The mobile vehicle body 1 is moved manually by pushing or pulling, or by connecting a motor to the casters 11. An extension component 2 is movably mounted at the front end of the mobile vehicle body 1. A centering support component 3 is movably mounted at the front end of the extension component 2. The centering support component 3 is used to contact the outer surface of the concrete pile head 14. Limiting components 4 are provided on both sides of the mobile vehicle body 1. The limiting components 4 are used to connect the concrete pile head 14 and, in conjunction with the centering support component 3, to maintain the connection between the mobile vehicle body 1 and the pile head 14. The relative positions of the pile heads 14 are defined. A feeding component 5 is movably mounted on the mobile vehicle body 1. A shifting component 6 is mounted on the feeding component 5. The feeding component 5 is used to move the shifting component 6. An opening component 7 and a slotting component 8 are mounted on the shifting component 6. The shifting component 6 can drive the opening component 7 and the slotting component 8 to shift positions, so that the opening component 7 and the slotting component 8 contact the pile head 14 in sequence. A water tank 9 and a moving handle 10 are mounted at the rear end of the mobile vehicle body 1. The water tank 9 is used to store water and can supply water to the opening component 7 and the slotting component 8. The moving handle 10 facilitates the operation of the device by the construction personnel.

[0023] In an optional embodiment, the extension assembly 2 includes an extension plate 21. An extension groove 12 for accommodating the extension plate 21 is formed on the mobile vehicle body 1. The extension plate 21 is slidably disposed in the extension groove 12, and an extension screw 22 is rotatably disposed in the extension groove 12 along the sliding direction of the extension plate 21. One end of the extension screw 22 passes through the mobile vehicle body 1 and is connected to the output end of the extension power component. The extension power component is a motor and is disposed on the mobile vehicle body 1. The extension screw 22 is threadedly connected to the extension plate 21 and can change its connection length with the extension plate 21 by rotation, so that the extension plate 21 extends out of the extension groove 12. A limiting groove 13 with its length direction parallel to the axis of the extension screw 22 is formed through one side of the extension groove 12. A limiting pin 23 is provided on the extension plate 21 and is slidably disposed in the limiting groove 13 to prevent the extension plate 21 from extending too far and falling out of the extension groove 12, thereby improving the safety of the device.

[0024] In an optional embodiment, the centering support assembly 3 includes a bidirectional lead screw 31, which is rotatably mounted on the side of the extension plate 21 away from the moving vehicle body 1. The axis of the bidirectional lead screw 31 is horizontal to the ground and perpendicular to the sliding direction of the extension plate 21. Sliding seats 32 are symmetrically arranged at both ends of the bidirectional lead screw 31, and the sliding seats 32 are threadedly connected to the bidirectional lead screw 31. The sliding seats 32 are slidably connected to the extension plate 21. Rotating the bidirectional lead screw 31 can adjust the distance between the sliding seats 32. Contact rollers 33 are rotatably mounted on each sliding seat 32. The axes of the contact rollers 33 are all perpendicular to the ground. The surface of the contact rollers 33 is used to contact the surface of the side wall of the pile head 14. One end of the bidirectional lead screw 31 is provided with a rotating handle, which makes it convenient for the operator to rotate the bidirectional lead screw 31 to adjust the distance between the contact rollers 33. In another embodiment, one end of the bidirectional lead screw 31 is connected to the output end of a small motor. The motor is located on one side of the extension plate 21 and is used to drive the bidirectional lead screw 31 to rotate, thereby reducing labor intensity and preventing the outer wall of the pile head 14 from touching other parts of the device other than the contact rollers 33 when contacting pile heads 14 of different diameters.

[0025] In an optional embodiment, the limiting component 4 includes a roller 41 and a support roller 42. The roller 41 is rotatably mounted on the moving vehicle body 1, and its axis is perpendicular to the ground, i.e., parallel to the axis of the pile head 14. One end of the roller 41 is connected to the output end of the limiting power component 43, which is a motor and mounted on the moving vehicle body 1. A restraining strap 44 is wound around the roller 41. The restraining strap 44 is of sufficient length, with one end connected to the roller 41 and the other end having a connector 45. The connectors 45 on the restraining straps 44 of the two limiting components 4 can be connected to each other for gripping the outer wall of the pile head 14. Preferably... The connector 45 uses a common metal buckle. The plug end and buckle end of the buckle are respectively connected to the restraint straps 44 of the limiting components 4 on both sides, achieving a quick connection effect and good economy. The support roller 42 is rotatably mounted on the moving vehicle body 1, and the axis of the support roller 42 is parallel to the axis of the winding roller 41. The support roller 42 is used to contact the side of the restraint strap 44 away from the pile head 14 and to support the restraint strap 44, avoiding friction between the restraint strap 44 and the moving vehicle body 1, thus improving service life. When in use, the restraint strap 44 is connected and held on the outside of the pile head 14, and the limiting power component 43 is tightened to achieve the gripping of the pile head 14.

[0026] In an optional embodiment, the feed assembly 5 includes a movable seat 51, which is slidably mounted on the movable vehicle body 1, with its sliding direction parallel to the sliding direction of the extension plate 21. The movable seat 51 is threadedly connected to a feed screw 52, ​​which is rotatably mounted on the movable vehicle body 1, with its axis parallel to the sliding direction of the movable seat 51. One end of the feed screw 52 is connected to the output end of a feed power component 53, which is a motor mounted on the movable vehicle body 1. A guide rod 54 and a lifting screw 5 are mounted on the movable seat 51. 5. The axes of the guide rod 54 and the lifting screw 55 are parallel to each other and perpendicular to the axis of the feed screw 52. The ends of the guide rod 54 and the lifting screw 55 away from the moving seat 51 are connected through the upper top plate 56. The upper top plate 56 is provided with a lifting power component 57, which is a motor. The output end of the lifting power component 57 is connected to one end of the lifting screw 55. The lifting screw 55 is rotatably disposed between the moving seat 51 and the upper top plate 56. Preferably, at least two guide rods 54 are provided to improve the stability of the connection between the feed assembly 5 and the shifting assembly 6.

[0027] In an optional embodiment, the shifting assembly 6 includes a shifting seat 61, which is slidably disposed on the guide rod 54 and threadedly connected to the lifting screw 55. A rotating plate 62 is rotatably disposed on the shifting seat 61, and the axis of rotation of the rotating plate 62 is collinear with the axis of rotation of the lifting screw 55. There is no contact between the rotating plate 62 and the lifting screw 55 to avoid the rotating plate 62 affecting the rotation of the lifting screw 55. The rotating plate 62 is connected to the output end of a rotating power component 63, which is a motor disposed on the shifting seat 61 and is used to drive the rotating plate 62 to rotate.

[0028] In an optional embodiment, the rotating plate 62 is L-shaped, with the corner of the L-shape rotatably mounted on the shifting seat 61. A driven gear 64 is mounted on the rotating plate 62, with the axis of the driven gear 64 being colinear with the axis of rotation of the rotating plate 62, for driving the rotating plate 62 to rotate. The driven gear 64 meshes with the driving gear 65, which is located at the output end of the rotating power component 63 to drive the rotating plate 62 to rotate.

[0029] In an optional embodiment, a semi-circular rotary guide groove is formed on the movable seat 51, with the center of the rotary guide groove located on the axis of rotation of the rotating plate 62. Slider blocks are provided at the bottom of both ends of the rotating plate 62. The sliders are cylindrical and are slidably disposed in the rotary guide groove for sliding along the length of the rotary guide groove, which improves the stability and accuracy of the rotation positioning when the rotating plate 62 rotates. The rotating plate 62 stops rotating when the sliders contact the ends of the rotary guide groove, making the repositioning more accurate.

[0030] In an optional embodiment, the hole-opening assembly 7 includes a hole-opening power component 71, which is a motor and is located at one end of the rotating plate 62. The output end of the hole-opening power component 71 is connected to a drill bit 72, and the drill bit 72 is replaceable. Preferably, the hole-opening assembly 7 directly adopts a commercially available electric water drill, which is more economical, and the drill bit 72 can be replaced. When opening a hole, the axis of the drill bit 72 is located on the symmetrical plane of the sliding seats 32 at both ends of the bidirectional lead screw 31, so that the axis of the drill bit 72 can be aligned with the axis of the pile head 14 when opening a hole.

[0031] In an optional embodiment, the slit-cutting assembly 8 includes a high-pressure water pump connected to a power source, which can be a battery or a generator, and is electrically connected to other power components. The inlet of the high-pressure water pump is connected to the bottom of the water tank 9, and the outlet of the high-pressure water pump is connected to the cutting head 81 through a retractable, flexible pipe capable of withstanding high pressure. The cutting head 81 is a mixing component of a common waterjet cutting device, used to mix water and abrasive to improve the cutting effect. Since the depth of the concrete slit cut by this device does not need to be too deep, the requirements for the cutting medium do not need to be too high. Only high-pressure water is needed to cut the concrete slit, avoiding the problem of the overall size of the equipment being too large and inconvenient to move and use. The output end of the cutting head 81 is provided with a nozzle 82. The length of the nozzle 82 meets the depth requirement of the deepest hole 15 to be cut. The end of the nozzle 82 away from the cutting head 81 is connected to a nozzle 83. The nozzle 83 is a nozzle of a common waterjet cutting device. The water outlet direction of the nozzle 83 is perpendicular to the length direction of the nozzle 82, and is used to cut the inner wall of the hole 15.

[0032] In an optional embodiment, the cutting head 81 is detachably mounted on the angle adjusting sleeve 84, which includes two semi-cylindrical sleeve pieces connected by bolts. The angle adjusting sleeve 84 is rotatably mounted on the angle mounting seat 85. The angle adjusting sleeve 84 is connected to the output end of the angle adjusting power component 86, which is mounted on the rotating plate 62 and is used to drive the angle adjusting sleeve 84 to rotate relative to the angle mounting seat 85. The axis of rotation of the angle adjusting sleeve 84 is perpendicular to the axis of the lifting screw 55. The angle mounting seat 85 is located at the end of the rotating plate 62 away from the hole assembly 7. When the slit is opened, the axis of the nozzle 82 is located on the symmetrical plane of the sliding seats 32 at both ends of the bidirectional screw 31. In an optional embodiment, a worm gear is provided on one of the sleeves of the angle adjusting sleeve 84. The axis of the worm gear is collinear with the axis of rotation of the angle adjusting sleeve 84. The worm gear is connected to a worm, which is rotatably mounted on the rotating plate 62. One end of the worm is connected to the output end of the angle adjusting power component 86. The worm is used to drive the worm gear to rotate, thereby rotating the angle adjusting sleeve 84 and adjusting the water outlet direction of the nozzle 83.

[0033] In an optional embodiment, an indicator line is provided on the angle adjustment sleeve 84, and a scale is provided on the angle mounting base 85 corresponding to the indicator line. Positioning lines are provided on both the cutting head 81 and the angle adjustment sleeve 84. When the positioning lines coincide and the indicator line points to the middle position of the scale, the water outlet direction of the nozzle 83 is directly upward, that is, parallel to the axis of the lifting screw 55. This makes it convenient for the staff to observe the rotation angle of the angle adjustment sleeve 84, making the orientation of the water outlet end of the nozzle 83 more accurate.

[0034] In an optional embodiment, a support shaft 87 is detachably mounted on one end of the nozzle 82 near the nozzle 83, and the length of the support shaft 87 is adjustable. The support shaft 87 is located on the side of the nozzle 82 away from the water outlet direction of the nozzle 83. Preferably, the support shaft is threaded onto a sheath, which is located at the end of the nozzle 82 near the nozzle 83, and the axis of the support shaft is perpendicular to the axis of the nozzle 82. By changing the length of the threaded connection between the support shaft and the sheath, the distance between the end of the support shaft away from the nozzle and the nozzle can be adjusted to accommodate holes of different diameters. This avoids excessive reaction force on the nozzle 82 when the nozzle 83 sprays water, which may cause the nozzle 82 to bend, thus improving the stability of the opening. More preferably, the end of the support shaft away from the nozzle is set as an arc surface to avoid damage to the inner wall of the hole when it slides in contact with the inner wall of the hole, which would affect the effect of directional crushing of the pile head.

[0035] In an optional embodiment, a control component is also included. The control component is disposed on the movable handle 10 and can be a commonly available control button or remote control, so as to enable the rapid start and stop of each power component on the device.

[0036] Example 2 like Figures 8-9 As shown, a method for directional pile head demolition, using the aforementioned pile head directional crack induction device, further includes the following steps: Step 1: Laying out the hole positions. Based on the diameter of the pile head, lay out the line 4 cm above the predetermined cutting position at the pile head height, and locate the opening positions on the side wall of the pile head. The axis of the openings should be perpendicular to the axis of the pile head. Determine the number of holes according to the following formula. Where N is the number of holes, rounded up, D is the diameter of the pile head, and s is the distance between the outermost ends of adjacent holes. The higher the concrete strength grade, the smaller the value of s; Based on the calculated number of holes, the position of each hole is evenly positioned circumferentially on the sidewall of the pile head, without needing to avoid the position of the reinforcing cage inside the pile head. The drilling assembly can directly cut the reinforcing cage during drilling. The hole diameter and depth are calculated based on the diameter of the pile head, where the hole diameter... And d is not less than 22 mm and not more than 40 mm, hole depth ; Step 2: Device positioning. Select the diameter and length of drill bit 72 according to the hole depth and diameter to be drilled, and install it at the output end of the drilling power unit 71. Then move the directional crack induction device of pile head 14 to one side of the pre-crushed pile head 14. Adjust the distance between the two contact rollers 33 according to the diameter of the pile head 14 so that the side wall of the pile head 14 is in contact with the surface of the contact rollers 33. Then pull out the binding straps 44 on both sides so that the binding straps 44 on both sides wrap around the pile head 14 to the rear side of the pile head 14. With the device position as the front side of the pile head 14, connect the binding straps 44 on both sides through the connector 45. Start the limiting power unit 43 to tighten the binding straps 44 so that the device is held on the pile head 14 by the binding straps 44. Step 3: Drilling. Rotate the rotating plate 62 so that the axis of the drill bit 72 is in the same plane as the axis of the pile head 14, and the axis of the drill bit 72 is perpendicular to the axis of the pile head 14. Adjust the height of the drill bit 72 so that the height of the axis of the drill bit 72 is consistent with the height of the axis of the pre-drilled hole 15. Rotate the entire device to make the axis of the drill bit 72 collinear with the axis of the pre-drilled hole 15. Adjust the extension of the extension plate 21 according to the length of the drill bit 72 so that the contact roller 33 can always contact the side wall of the pile head 14. Then start the drilling power component 71 and the feed power component 53 to drill the side wall of the pile head 14. When drilling, the operator can hold the moving handle 10 to improve the stability of the device. After drilling a hole 15, take out the core. First loosen the binding belt 44, then rotate the entire device so that the axis of the drill bit 72 is collinear with the axis of the next pre-drilled hole 15. Then tighten the binding belt 44 to drill the hole at that position until all holes are drilled. Step 4: Open the slit. Rotate the rotating plate 62 so that the axis of the nozzle 82 is in the same plane as the axis of the pile head 14, and the axis of the nozzle 82 is perpendicular to the axis of the pile head 14. Adjust the height of the nozzle 82 so that the height of the nozzle 82's axis is consistent with the height of the opened hole's axis. Then, adjust the length of the support shaft 87 according to the hole diameter so that the distance from the end of the support shaft 87 to the axis of the nozzle 82 is half the hole diameter, facilitating contact and support between the support shaft 87 and the inner wall of the hole. Start the feed power unit. 53. Insert the nozzle 83 into the hole 15, adjust the spray angle of the nozzle 83 as needed, and ensure that the spray direction of the bottommost hole 15 is not downward. Then start the high-pressure water pump, and the nozzle 83 sprays out a high-pressure water stream. At the same time, the feed power component 53 drives the nozzle 83 to move along the length of the hole 15 to open the guide groove 16 on the inner wall of the hole 15. The depth of the guide groove 16 is not less than 2 mm. Open the guide groove 16 in all the holes 15 in sequence to complete the slit opening. Step 5: Device relocation. Separate the connector of the binding strap 44, retract the binding strap 44, and then move the device away from the pile head 14 or to the next pre-treated pile head 14. Step 6: Clean the hole. Use a high-pressure blower to blow out excess water and concrete residue from the opening of hole 15, ensuring that there is no water or residue in hole 15. At the same time, since the opening of hole 15 is wet due to the water cutting in the early stage, the step of spraying water into hole 15 can be reduced. Spraying a small amount of water into the hole can improve the adhesion of the grout. Step 7: Prepare and fill the holes with slurry. Mix calcium oxide and water at a mass ratio of 3:1 to form a slurry. Then add 0.5% by volume of thickener, hydroxypropyl methylcellulose, to the slurry to improve its adhesion in the transverse holes 15. Mix the slurry evenly with a stirrer. Then use a grouting gun with an extension tube to inject slurry into the holes 15. After the holes 15 are grouted, use a sealing device to plug the openings of the holes 15. The sealing device is a conical rubber plug, which can adapt to various hole diameters 15. Alternatively, explosion-proof yellow mud can be used for sealing, which is more economical. Step 8: Break the pile head 14. After the pile head 14 is broken, clean up the concrete block and remove the remaining small amount of pile head 14 above the predetermined height using other methods, such as a small cutting machine, to make precise cuts and complete the demolition of the pile head 14.

[0037] Example 3 Based on Example 2, for pile heads 14 with a lower expected demolition height, such as pile heads 14 less than 0.5 meters, only one layer of circumferentially arranged holes 15 needs to be opened on its outer wall. The guiding grooves 16 inside the holes 15 are located on the left, right, and top sides of the holes 15. Figure 10 As shown.

[0038] Example 4 Based on Example 2, for pile heads 14 with a high expected breaking height, i.e., pile heads 14 with a height of 0.5 meters or more, multiple layers of circumferentially arranged holes 15 need to be opened along its length, and the height difference between each layer of holes 15 is 0.5 meters, so that the volume of the broken pieces of the pile head 14 is convenient for subsequent cleaning. The positions of two adjacent layers of holes 15 are staggered, and the guiding direction of the guiding grooves 16 in each layer of holes 15 is different.

[0039] In the case of double-layered holes 15, the guide groove 16 of the bottom layer of holes 15 is located on the left and right sides of the hole 15 and on the upper side of the hole 15, pointing towards the nearest hole 15 in the upper layer of holes 15. The guide groove 16 of the upper layer of holes 15 is located on the top of the hole 15 and on the lower side of the hole 15, pointing towards the nearest hole 15 in the lower layer of holes 15. Figure 11 As shown; When there are three or more layers of holes 15, the orientation of the bottom and top holes 15 and their guiding grooves 16 is consistent with the orientation of the guiding grooves 16 of the upper and lower layers of the double-layer holes 15. The orientation of the guiding groove 16 of the middle hole 15 is towards the nearest adjacent upper and lower layer hole 15. Figure 12 As shown, this allows for higher crushing efficiency and better quality of the pile head 14, and facilitates subsequent cleaning operations.

[0040] All aspects not detailed in this invention are conventional technical means known to those skilled in the art.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pile head directional crack induction device, comprising a mobile vehicle body (1), wherein the bottom of the mobile vehicle body (1) is provided with moving wheels (11), characterized in that, The front end of the mobile vehicle body (1) is equipped with an extension component (2), and the front end of the extension component (2) is equipped with a centering support component (3). The centering support component (3) is used to contact the outer wall of the concrete pile head. The mobile vehicle body (1) is equipped with a limiting component (4) on both sides. The limiting component (4) is used to connect the concrete pile head and, together with the centering support component (3), limits the relative position between the mobile vehicle body (1) and the pile head. The mobile vehicle body (1) is equipped with a feeding component (5), and the feeding component (5) is equipped with a shifting component (6) to drive the shifting component (6) to move. The shifting component (6) is equipped with an opening component (7) and a slotting component (8) to drive the opening component (7) and the slotting component (8) to shift. The rear end of the mobile vehicle body (1) is equipped with a water tank (9) and a moving handle (10). The centering support assembly (3) includes a bidirectional screw (31), which is rotatably mounted on the side of the extension plate (21) away from the moving vehicle body (1). The axis of the bidirectional screw (31) is horizontal to the ground and perpendicular to the sliding direction of the extension plate (21). Sliding seats (32) are symmetrically arranged at both ends of the bidirectional screw (31), and the sliding seats (32) are threadedly connected to the bidirectional screw (31). The sliding seats (32) are slidably connected to the extension plate (21). Rotating the bidirectional screw (31) can adjust the distance between the sliding seats (32). Contact rollers (33) are rotatably mounted on the sliding seats (32). The axis of the contact rollers (33) is perpendicular to the ground. The contact rollers (33) are used to contact the side wall of the pile head. The limiting component (4) includes a roller (41) and a support roller (42). The roller (41) is rotatably mounted on the moving vehicle body (1). The axis of the roller (41) is perpendicular to the ground. The roller (41) is connected to a limiting power component (43). The limiting power component (43) is mounted on the moving vehicle body (1). A binding strap (44) is wound on the roller (41). A connector (45) is provided at one end of the binding strap (44). The connectors (45) on the binding straps (44) of the two limiting components (4) can be connected to each other to be used to hold the outer wall of the pile head. The support roller (42) is rotatably mounted on the moving vehicle body (1). The axis of the support roller (42) is parallel to the axis of the roller (41). It is used to contact the side of the binding strap (44) away from the pile head and can support the binding strap (44) to avoid friction between the binding strap (44) and the moving vehicle body (1). The feed assembly (5) includes a movable seat (51), which is slidably mounted on the moving car body (1) with its sliding direction parallel to the sliding direction of the extension plate (21). The movable seat (51) is threadedly connected to a feed screw (52), which is rotatably mounted on the moving car body (1) with its axis parallel to the sliding direction of the movable seat (51). One end of the feed screw (52) is connected to a feed power component (53), which is mounted on the moving car body (1). A guide rod (54) and a lifting screw (55) are provided on the upper part of the feed screw (52). The axes of the guide rod (54) and the lifting screw (55) are parallel to each other and perpendicular to the axis of the feed screw (52). The ends of the guide rod (54) and the lifting screw (55) away from the moving seat (51) are connected through the upper top plate (56). A lifting power component (57) is provided on the upper top plate (56). The output end of the lifting power component (57) is connected to one end of the lifting screw (55). The lifting screw (55) is rotatably positioned between the moving seat (51) and the upper top plate (56). The shifting assembly (6) includes a shifting seat (61), which is slidably mounted on the guide rod (54) and threadedly connected to the lifting screw (55). A rotating plate (62) is rotatably mounted on the shifting seat (61), and there is no contact between the rotating plate (62) and the lifting screw (55). The rotating plate (62) is connected to a rotating power component (63), which is mounted on the shifting seat (61) and is used to drive the rotating plate (62) to rotate. The slit assembly (8) includes a high-pressure water pump. The inlet of the high-pressure water pump is connected to a water tank (9), and the outlet of the high-pressure water pump is connected to a cutting head (81). A nozzle (82) is installed on the cutting head (81). The end of the nozzle (82) away from the cutting head (81) is connected to a nozzle (83). The water outlet direction of the nozzle (83) is perpendicular to the length direction of the nozzle (82). The cutting head (81) is detachably mounted on an angle adjusting sleeve (84). The angle adjusting sleeve (84) is rotatably mounted on an angle mounting base (85). The angle adjusting sleeve (84) is connected to an angle adjusting power component (86). 6) Set on the rotating plate (62) to drive the angle adjustment sleeve (84) to rotate. The axis of rotation of the angle adjustment sleeve (84) is perpendicular to the axis of the lifting screw (55). The angle mounting seat (85) is set at the other end of the rotating plate (62). When the slit is opened, the axis of the nozzle (82) is located on the symmetrical plane of the sliding seats (32) at both ends of the double screw (31). The end of the nozzle (82) near the nozzle (83) is detachably equipped with a support shaft (87), and the length of the support shaft (87) can be adjusted. The support shaft (87) is located on the side of the nozzle (82) away from the water outlet direction of the nozzle (83).

2. The pile head directional crack induction device according to claim 1, characterized in that: The extension assembly (2) includes an extension plate (21). An extension groove (12) for accommodating the extension plate (21) is opened on the mobile vehicle body (1). The extension plate (21) is slidably disposed in the extension groove (12). An extension screw (22) is rotatably disposed in the extension groove (12) along the sliding direction of the extension plate (21). One end of the extension screw (22) passes through the mobile vehicle body (1) and is connected to an extension power component. The extension power component is disposed on the mobile vehicle body (1). The extension screw (22) is threadedly connected to the extension plate (21) and can change its connection length with the extension plate (21) by rotation. A limiting groove (13) parallel to the axis of the extension screw (22) is opened through one side of the extension groove (12). A limiting pin (23) is provided on the extension plate (21) and is slidably disposed in the limiting groove (13).

3. The pile head directional crack induction device according to claim 1, characterized in that: The rotating plate (62) is L-shaped, and the corner of the L-shape is rotatably mounted on the shift seat (61). A driven gear (64) is mounted on the rotating plate (62), and the axis of the driven gear (64) is co-linear with the axis of rotation of the rotating plate (62) to drive the rotating plate (62) to rotate. The driven gear (64) meshes with the driving gear (65), and the driving gear (65) is located at the output end of the rotating power component (63).

4. The pile head directional crack induction device according to claim 1, characterized in that: The hole-opening assembly (7) includes a hole-opening power component (71), which is located at one end of the rotating plate (62). The output end of the hole-opening power component (71) is connected to the drill bit (72), and the drill bit (72) can be replaced. When opening a hole, the axis of the drill bit (72) is located on the symmetrical plane of the sliding seats (32) at both ends of the two-way lead screw (31).

5. A method for directional demolition of pile heads, comprising the pile head directional crack induction device as described in claim 1, characterized in that, It also includes the following steps: Step 1: Laying out the hole positions. Based on the diameter of the pile head, lay out the line above the predetermined cutting position at the pile head height, and locate the opening positions on the side wall of the pile head. The axis of each opening is perpendicular to the axis of the pile head. Determine the number of holes according to the following formula. Where N is the number of holes, rounded up; D is the diameter of the pile head; and s is the distance between the outermost ends of adjacent holes. ; Based on the calculated number of holes, the position of each hole is evenly positioned circumferentially on the sidewall of the pile head, without needing to avoid the position of the reinforcing cage inside the pile head. The hole diameter and depth are calculated based on the diameter of the pile head, where the hole diameter... And d is not less than 22 mm and not more than 40 mm, hole depth ; Step 2: Device positioning. Select the diameter and length of the drill bit according to the hole depth and diameter to be drilled, and install it at the output end of the drilling power unit. Then move the pile head directional crack induction device to one side of the pre-crushed pile head. Adjust the distance between the two contact rollers according to the diameter of the pile head so that the side wall of the pile head is in contact with the surface of the contact rollers. Then pull out the binding straps on both sides so that the binding straps on both sides wrap around the pile head from both sides to the rear side of the pile head. Connect the binding straps on both sides through the connector. The limiting power unit tightens the binding straps so that the device is held on the pile head by the binding straps. Step 3: Drilling. Rotate the rotating plate so that the axis of the drill bit and the axis of the pile head are in the same plane and perpendicular to the axis of the pile head. Adjust the height of the drill bit so that the height of the drill bit axis is consistent with the height of the axis of the pre-drilled hole. Rotate the entire device to make the axis of the drill bit collinear with the axis of the pre-drilled hole. Adjust the extension of the extension plate according to the length of the drill bit so that the contact roller can always contact the side wall of the pile head. Then start the drilling power component and the feed power component to drill the hole in the side wall of the pile head. After drilling one hole, take out the core. First loosen the binding belt, then rotate the entire device to make the axis of the drill bit collinear with the axis of the next pre-drilled hole. Then tighten the binding belt and drill the hole at that position until all holes are drilled. Step 4: Opening the slot. Rotate the rotating plate so that the axis of the nozzle is in the same plane as the axis of the pile head, and the axis of the nozzle is perpendicular to the axis of the pile head. Adjust the height of the nozzle so that the height of the nozzle axis is consistent with the height of the opened hole axis. Then, adjust the length of the support shaft according to the hole diameter so that the distance from the end of the support shaft to the nozzle axis is half the hole diameter, which facilitates the support shaft to contact and support the inner wall of the hole. Start the feed power unit and insert the nozzle into the hole. Adjust the spray direction of the nozzle as needed, and the spray direction must not be downward. Then start the high-pressure water pump, and the nozzle sprays high-pressure water. At the same time, the feed power unit drives the nozzle to move along the length of the hole to open the guide groove on the inner wall of the hole. Open the guide groove in all holes in sequence to complete the opening. Step 5: Device relocation. Separate the connectors of the binding straps, retract the binding straps, and then move the device away from the pile head or to the next pre-treated pile head. Step Six: Clean the hole. Use a high-pressure blower to blow out excess water and concrete residue from the opening to ensure that there is no water or residue in the hole. Step 7: Prepare grout and fill holes. Mix calcium oxide and water in a mass ratio of 3:1 to form a grouting agent slurry. Then add 0.5% by volume of thickener. Mix the slurry evenly with a mixer. Then use a grouting gun with an extension pipe to inject grout into the hole. After the hole is grouted, use a sealing device to plug the hole opening. Step 8: Break the pile head. After the breaking agent expands and the pile head is broken, clean up the concrete blocks and remove the remaining small amount of pile head above the predetermined height using other methods to complete the pile head demolition.

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