Stable hoisting device for cutting pile head of steel pipe pile

Abstract

The invention relates to the technical field of steel pipe pile hoisting, in particular to a stable hoisting device for a steel pipe pile cutting pile head. The device comprises a hoisting connecting assembly and a holding unit, the lifting connection assembly comprises a triangular lifting appliance and a lifting rope connected with the triangular lifting appliance, the upper end of the triangular lifting appliance is used for being detachably connected with external lifting equipment, and the lifting rope is detachably connected with the enclasping unit and used for stably transmitting lifting force; the enclasping unit is of an annular structure matched with the outer wall of the steel pipe pile, the enclasping amplitude can be adjusted in the radial direction, and the enclasping unit is matched with steel pipe piles of different diameter specifications. The enclasping amplitude of the enclasping unit of the device can be adjusted in the radial direction, the device can adapt to steel pipe piles with different diameters without replacing equipment, and the input cost is reduced. The adjustable clasping force enables the clasping unit to be tightly attached to the pile body, so that radial deviation and axial falling during cutting and hoisting are avoided, and the construction safety is guaranteed; the holding unit fixes the pile body in a non-destructive attaching mode, the pile body structure is prevented from being damaged by punching and welding, and the follow-up use performance is ensured.

Description

Technical Field

[0001] This invention relates to the field of steel pipe pile hoisting technology, specifically to a stable hoisting device for cutting the pile head of a steel pipe pile. Background Technology

[0002] During the construction of the steel pipe pile foundation wharf, after the steel pipe piles are driven into the water according to the design requirements, the excess upper part of the pile body needs to be cut off, removed, and hoisted to land. These cut steel pipes will be welded and extended for reuse in subsequent pile foundation construction. To ensure the smooth installation of subsequent upper longitudinal and transverse beams and other structures, all cut joints of the steel pipe piles must meet the stringent requirements of uniform elevation and high levelness.

[0003] The cutting of steel pipe piles is carried out entirely on water, making the work complex and challenging. The lengths of the steel pipe piles to be cut vary considerably, ranging from 7-8 meters to relatively short ones, with pile diameters generally exceeding 1 meter. Traditional cutting methods have several drawbacks: temporary scaffolding must be erected before construction; then, two symmetrical lifting holes must be cut at the top of the steel pipe pile; the pile is secured with shackles and wire ropes; a land crane applies appropriate tension to the wire ropes to maintain pile stability; finally, an oxy-acetylene torch is used to cut the steel pipe pile around its circumference at a uniform elevation. After cutting, the upper steel pipe is hoisted ashore, but the previously cut lifting holes need to be repaired before they can be welded to other steel pipes for reuse in piling. This hole repair process is not only time-consuming but also damages the original structural integrity of the steel pipe pile, affecting the quality and safety of the pile in subsequent use.

[0004] Chinese patent CN202423182190.1 discloses a "Pile Head Lifting Device" (publication number CN223480584U). This device includes a first lifting rope assembly and a hook. At least one side of the pile head bottom has a through hole. A portion of the first lifting rope assembly extends into the pile head from the open top, forming a U-shaped section, which exits through the through hole. The lower end of the first lifting rope assembly wraps around the top of the pile head and connects to the hook on the outside of the pile head, with the U-shaped section and the hook engaging. However, this device has some drawbacks: it requires a pre-drilled through hole at the bottom of the pile head. The device uses the first lifting rope assembly, whose U-shaped section extends into the pile head and exits through the through hole at the bottom, to cooperate with the hook, forming a closed loop with the U-shaped section, the lower end of the rope, and the hook to fix the pile head. This still requires drilling holes in the pile head beforehand, which damages the original structural integrity of the steel pipe pile. Furthermore, the through hole can easily lead to localized stress concentration in the pile body, affecting the quality and safety of the pile body in subsequent use. Summary of the Invention

[0005] To address the problems of the prior art, this invention provides a stable hoisting device for cutting the pile head of a steel pipe pile. This device achieves a stable connection with the pile body without the need for destructive drilling at the pile head, without damaging the pile structure throughout the process. It maximizes the preservation of the original integrity of the steel pipe pile and ensures the structural safety and reliability for subsequent welding extensions and reuse.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stable hoisting device for cutting the pile head of a steel pipe pile, comprising a hoisting connection assembly and a clamping unit; the hoisting connection assembly includes a triangular lifting tool and a lifting rope connected to the triangular lifting tool, the upper end of the triangular lifting tool being detachably connected to external hoisting equipment, and the lifting rope being detachably connected to the clamping unit for stably transmitting the hoisting force; the clamping unit is an annular structure adapted to the outer wall of the steel pipe pile, capable of radially adjusting the clamping amplitude to adapt to steel pipe piles of different diameters, and the adjustable clamping force ensures that the clamping unit is tightly fitted to the outer wall of the steel pipe pile, ensuring that the pile body does not shift or fall off during the hoisting process of cutting the pile head.

[0007] With the above structural design, the triangular lifting device disperses the lifting force through multi-point force distribution. Combined with the detachable connection between the lifting rope and the clamping unit, it achieves stable transmission of lifting force, preventing force concentration during lifting and thus avoiding pile swaying. The clamping unit can adjust the clamping amplitude radially, adapting to steel pipe piles of different diameters without equipment replacement, reducing construction equipment investment costs. The adjustable clamping force ensures a tight fit between the clamping unit and the outer wall of the steel pipe pile, structurally preventing radial displacement and axial detachment of the pile during cutting and lifting, ensuring construction safety. The clamping unit fixes the pile through a "tight fit rather than destructive connection," avoiding damage to the structural integrity of the steel pipe pile caused by drilling, welding, and other processing, ensuring the subsequent performance of the pile.

[0008] Preferably, the clamping unit includes two arc-shaped clamping plates hinged to each other at one end, an anti-slip pad fixedly connected to the inner wall of the arc-shaped clamping plate, a connecting plate fixedly connected to the other end of the arc-shaped clamping plate, and a connecting bolt passing through the connecting plate. The two arc-shaped clamping plates together form a ring structure adapted to the steel pipe pile. The upper and lower ends of the arc-shaped clamping plates are both fixedly connected to a first lifting lug for detachable connection with the lifting rope.

[0009] The above structural design is simple and easy to operate: the arc-shaped clamping plate adopts an openable structure, which is convenient for quick installation or disassembly, and is suitable for the needs of efficient on-site construction; by tightening / loosening the connecting bolts, the encirclement range of the two arc-shaped clamping plates can be precisely adjusted, thereby controlling the clamping force, ensuring the reliability of the fixation, and avoiding excessive clamping that could damage the pile; the anti-slip pad on the inner wall of the arc-shaped clamping plate increases the friction coefficient with the outer wall of the steel pipe pile, and together with the positive pressure applied by the bolts, forms a double anti-slip guarantee, which is especially suitable for steel pipe piles with slightly rough or damp surfaces; the upper and lower ends of the arc-shaped clamping plate are equipped with first lifting lugs, which form a multi-point symmetrical connection with the lifting rope, ensuring that the pile is subjected to uniform force during lifting, avoiding the tilting of the pile caused by unilateral force, and providing a basis for horizontal cutting.

[0010] Preferably, the clamping unit includes a clamping cylinder for clamping the outer wall of the steel pipe pile, a positioning post for clamping the inner wall of the steel pipe pile, an outer clamping airbag detachably connected to the inner wall of the clamping cylinder, an inner clamping airbag detachably connected to the positioning post, a first inflation branch pipe fixedly connected to the outer clamping airbag, a second inflation branch pipe fixedly connected to the inner clamping airbag, an inflation main pipe connected to the first and second inflation branch pipes, and a high-pressure air pump connected to the inflation main pipe. The upper and lower ends of the clamping cylinder are both fixedly connected to outer lifting lugs for detachable connection to a lifting rope. An inner lifting lug is fixedly connected to the positioning post, and a first rope is detachably connected to the inner lifting lug. The first rope is used to connect the triangular lifting device. The clamping unit is provided with a marking component for marking the cutting position of the steel pipe pile.

[0011] The above structural design features bidirectional clamping: the outer clamping airbag clamps the outer wall of the steel pipe pile, while the inner clamping airbag clamps the outer wall of the positioning column, forming a "double-sided clamping and inner support" fixing structure. This completely eliminates radial movement of the pile body, resulting in greater stability during lifting and cutting. The airbags are made of flexible material, which, after inflation, flexibly conforms to the pile wall, avoiding localized stress concentration that may occur during mechanical clamping. This effectively protects the outer coating and inner structure of the steel pipe pile, making it particularly suitable for thin-walled steel pipe piles. The inflation system consists of a high-pressure air pump, a main inflation pipe, and branch pipes. The system can precisely adjust the air pressure inside the airbag, thereby controlling the clamping force and adapting to steel pipe piles of different wall thicknesses and materials, avoiding insufficient or excessive clamping force. The concentric design of the clamping cylinder and the positioning column, combined with the synchronous expansion of the inner and outer airbags, ensures that the steel pipe pile and the lifting device are positioned coaxially, so that the pile body is not eccentric or tilted during lifting, improving the levelness of the cutting surface. The inner lifting lug and the first rope, together with the triangular lifting device, form a double lifting connection of "outer lifting rope + inner rope", further distributing the force and avoiding safety hazards caused by the failure of a single connection point.

[0012] Preferably, the outer clamping airbag is an annular airbag structure adapted to the curvature of the inner wall of the clamping cylinder. The outer ring surface of the outer clamping airbag is detachably connected to the inner wall of the clamping cylinder. Multiple sets of outer clamping airbags are provided, and adjacent outer clamping airbags are connected through an outer connecting tube. The inner clamping airbag is an annular airbag structure adapted to the curvature of the outer wall of the positioning post. The inner ring surface of the inner clamping airbag is detachably connected to the outer wall of the positioning post. Multiple sets of inner clamping airbags are provided, and adjacent inner clamping airbags are connected through an inner connecting tube.

[0013] By adopting the above structural design, multiple sets of vertically distributed airbags increase the contact area with the pile, making the clamping force evenly distributed along the pile axis, avoiding local stress concentration caused by a single set of airbags, and reducing the risk of pile deformation. By connecting adjacent airbags vertically through outer and inner connecting pipes, the same type of airbags can be expanded synchronously with a single inflation, ensuring that the clamping force of each airbag is consistent and avoiding pile displacement caused by uneven expansion of airbags. Multiple sets of airbags vertically form an "axial limit", effectively preventing the pile from sliding vertically along the axis during lifting or cutting, further improving construction stability.

[0014] Preferably, the outer ring surface of the outer clamping airbag is fixedly connected to an outer hook and loop fastener male surface, and the inner wall of the clamping cylinder is fixedly connected to an outer hook and loop fastener female surface. The outer clamping airbag and the clamping cylinder are bonded and fixed together by corresponding outer hook and loop fastener male surfaces and outer hook and loop fastener female surfaces. The inner ring surface of the inner clamping airbag is fixedly connected to an inner hook and loop fastener male surface, and the outer wall of the positioning post is fixedly connected to an inner hook and loop fastener female surface. The inner clamping airbag and the positioning post are bonded and fixed together by corresponding inner hook and loop fastener male surfaces and inner hook and loop fastener female surfaces.

[0015] The above structural design makes assembly and disassembly convenient and efficient: the Velcro's "fit-and-separate" fixing method allows for quick installation or removal of airbags without tools, significantly shortening the time for equipment debugging and airbag replacement, and improving construction efficiency; when airbags are worn or aged, the corresponding airbags can be removed and replaced individually without replacing the entire clamping unit, reducing consumable costs and increasing equipment reuse rate.

[0016] Preferably, the inner ring surface of the outer clamping airbag and the outer ring surface of the inner clamping airbag are both provided with concave and convex textures.

[0017] The above structural design increases the contact roughness between the airbag and the steel pipe pile wall and the positioning column wall. Compared with a smooth airbag, it effectively prevents the relative sliding between the pile and the airbag. The "interlocking" effect of the concave and convex texture can limit the small displacement of the pile, especially during cutting operations, to avoid pile displacement caused by vibration and further improve the accuracy of the cutting position.

[0018] Preferably, the marking assembly includes a slider that slides along the outer peripheral wall of the clamping cylinder, a vertical support cylinder fixedly connected to the slider, a vertical rod passing through the vertical support cylinder, a clamping bolt threaded through the cylinder wall of the vertical support cylinder, a transverse support cylinder fixedly connected to the bottom end of the vertical rod, a transverse threaded rod threaded through the transverse support cylinder, and a marking pen fixedly connected to the front end of the transverse threaded rod, wherein the end face of the clamping bolt abuts against the outer wall of the vertical rod.

[0019] With the above structural design, the integrated marking component acts directly on the clamping unit, enabling rapid marking of the cutting position after hoisting and positioning. This avoids cutting errors caused by pile displacement in traditional marking methods, improving cutting accuracy. The slider can slide circumferentially along the outer wall of the clamping cylinder, adapting to different circumferential cutting positions. The vertical rod is fixed by clamping bolts, allowing adjustment of the marking height. The horizontal threaded rod can fine-tune the distance between the marking pen and the pile, achieving three-dimensional precise positioning with cutting errors controlled to the millimeter level. No additional positioning support is required; marking is performed directly using the clamping unit, simplifying the operation process and reducing the labor intensity of construction personnel. The marking position can be flexibly adjusted according to construction drawings, meeting both flat cutting requirements and adapting to special cutting scenarios such as oblique cutting, demonstrating strong versatility.

[0020] Preferably, a plurality of leveling bubbles are fixedly connected to the outer peripheral wall of the clamping cylinder, and the leveling bubbles are evenly distributed along the circumferential direction of the outer peripheral wall of the clamping cylinder.

[0021] With the above structural design, multiple circumferentially distributed leveling bubbles can reflect the horizontal state of the clamping cylinder from all directions. Construction personnel can quickly determine whether the clamping unit is horizontal without repeatedly checking around the pile, thus improving debugging efficiency. The horizontality of the clamping cylinder directly determines the horizontality of the steel pipe pile cutting surface. Real-time calibration with leveling bubbles can ensure that the cutting reference surface is horizontal, avoiding the tilting of the cutting surface caused by the tilting of the pile body in traditional construction, and improving the quality of pile head cutting. During the lifting process, the verticality of the pile body can be observed through leveling bubbles, which facilitates timely adjustment of the lifting equipment posture, avoids uneven force caused by the tilting of the pile body, and reduces the lifting safety risks.

[0022] Compared with the prior art, the beneficial effects of the present invention are: The clamping unit of this device allows for radial adjustment of the clamping amplitude, enabling it to adapt to steel pipe piles of different diameters without requiring equipment replacement, thus reducing investment costs. Its adjustable clamping force ensures a tight fit between the clamping unit and the pile body, preventing radial displacement and axial detachment during cutting and lifting, and guaranteeing construction safety. Simultaneously, the clamping unit secures the pile body through a non-destructive bonding method, avoiding damage to the pile structure from drilling and welding, and ensuring subsequent performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the lifting connection assembly of the present invention; Figure 4 This is a schematic diagram of the structure of one embodiment of the clamping unit of the present invention; Figure 5 For the present invention Figure 4 A top-view structural diagram of the mid-section; Figure 6 This is a schematic diagram of another embodiment of the clamping unit of the present invention; Figure 7 For the present invention Figure 6 A top-down structural diagram of the mid-section. Detailed Implementation

[0024] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 This invention provides a technical solution: a stable hoisting device for cutting pile heads of steel pipe piles, including a hoisting connection assembly 1 and a clamping unit 2; the hoisting connection assembly 1 includes a triangular lifting tool 11 and a lifting rope 12 connected to the triangular lifting tool 11. The upper end of the triangular lifting tool 11 is used for detachable connection with external hoisting equipment. The triangular lifting tool 11 is hooked on the hook of a truck crane. The lifting rope 12 is detachably connected to the clamping unit 2 for stable transmission of hoisting force; at least one set of clamping units 2 is provided, and slings are provided between the clamping units 2 arranged coaxially. The clamping unit 2 is a ring structure adapted to the outer wall of the steel pipe pile 9, which can adjust the clamping amplitude radially to adapt to steel pipe piles 9 of different diameters. The adjustable clamping force ensures that the clamping unit 2 is tightly attached to the outer wall of the steel pipe pile 9, ensuring that the pile body does not shift or fall off during the hoisting of the cut pile head.

[0025] As one embodiment of the clamping unit, the clamping unit includes two arc-shaped clamping plates 31 hinged to each other at one end, an anti-slip pad 32 fixedly connected to the inner wall of the arc-shaped clamping plate 31, a connecting plate 33 fixedly connected to the other end of the arc-shaped clamping plate 31, and a connecting bolt 34 passing through the connecting plate 33. The two arc-shaped clamping plates 31 together form a ring structure adapted to the steel pipe pile 9. The upper and lower ends of the arc-shaped clamping plates 31 are fixedly connected to a first lifting lug 35 for detachable connection with the lifting rope 12. When multiple clamping units are required, the upper and lower adjacent arc-shaped clamping plates 31 are connected by a sling.

[0026] Two arc-shaped clamping plates 31 are symmetrically arranged, and their curvature is adapted to the outer wall of the steel pipe pile 9. One end of the two arc-shaped clamping plates 31 is hinged to each other to form an openable clamping structure, so as to quickly fit onto the outer periphery of the steel pipe pile 9 or remove it from the steel pipe pile 9. The inner wall of each arc-shaped clamping plate 31 is fixedly connected with an anti-slip pad 32. The anti-slip pad 32 is made of rubber with a high coefficient of friction. The inner surface of the anti-slip pad 32 has transverse anti-slip textures to increase the frictional resistance with the outer wall of the steel pipe pile 9, while avoiding damage to the coating of the outer wall of the steel pipe pile 9 by rigid contact. The other end of each arc-shaped clamping plate 31 away from the hinge end extends vertically outward to form a connecting plate 33. The connecting plate 33 has corresponding openings. A through bolt hole is provided, through which a connecting bolt 34 and a matching lock nut are inserted. By tightening the connecting bolt 34, the inner diameter of the two arc-shaped clamping plates 31 can be adjusted, so that the anti-slip pad 32 fits tightly against the outer wall of the steel pipe pile 9 of different diameters, thereby forming a stable clamping force. The upper and lower ends of the arc-shaped clamping plates 31 are symmetrically fixedly connected with first lifting lugs 35. Each first lifting lug 35 has a connecting hole for threading the lifting rope 12. The first lifting lugs 35 and the lifting rope 12 are detachably connected by a shackle. The symmetrically distributed first lifting lugs 35 at the upper and lower ends can evenly transmit the lifting force to the arc-shaped clamping plates 31, ensuring that the steel pipe pile 9 is balanced and does not tilt during the lifting process.

[0027] When the steel pipe pile is cut to a long length or requires enhanced clamping stability, multiple clamping units need to be set up. The arc-shaped clamping plates 31 of two adjacent clamping units are fixedly connected by slings. The first lifting lug 35 at the lower end of the arc-shaped clamping plate 31 in the upper clamping unit corresponds one-to-one with the first lifting lug 35 at the upper end of the arc-shaped clamping plate 31 in the lower clamping unit. The two ends of the slings are detachably connected to the corresponding first lifting lugs 35 above and below by wire rope clamps. The length of the slings can be adjusted according to actual construction needs, so that multiple clamping units are evenly distributed along the axial direction of the steel pipe pile. The synergistic effect of multiple clamping units can increase the axial contact length with the steel pipe pile, further disperse the clamping force, and effectively suppress the radial offset and axial movement of the steel pipe pile during lifting or cutting. At the same time, the linkage fixation of the slings ensures that multiple clamping units are subjected to force synchronously, avoiding fixation failure caused by overload of a single clamping unit. This method is suitable for stable lifting of the cut pile head of large-diameter, long-body steel pipe piles.

[0028] Work steps: Step 1: First, adjust the opening and closing range of the clamping unit 2 according to the diameter specifications of the steel pipe pile 9: loosen the connecting bolts 34 of the arc-shaped clamping plate 31, open the two arc-shaped clamping plates 31 around the hinge end, and put them on the designated position of the area to be cut of the steel pipe pile 9. Then tighten the connecting bolts 34 so that the anti-slip pad 32 on the inner wall of the arc-shaped clamping plate 31 is tightly attached to the outer wall of the steel pipe pile 9. Utilize the positive pressure converted from the bolt preload, combined with the high friction coefficient and transverse anti-slip texture of the anti-slip pad 32, to form an initial stable clamping.

[0029] If the steel pipe pile 9 is long or requires enhanced stability, multiple sets of clamping units 2 can be set coaxially along the axial direction of the steel pipe pile 9. The first lifting lugs 35 of adjacent clamping units are connected one-to-one by slings, so that multiple sets of clamping units are evenly distributed along the pile body to form an axial multi-point clamping structure.

[0030] Step Two: The triangular lifting device 11 of the lifting connection assembly 1 is hooked onto the hook of the external truck crane, and the lifting rope 12 is detachably connected to the first lifting lug 35 of the uppermost clamping unit through the wire rope clamp.

[0031] The triangular lifting device 11 disperses the lifting force through a three-point force-bearing structure, avoiding the concentrated transmission of force; the first lifting lugs 35, which are symmetrically distributed at the upper and lower ends, ensure that the tension of the lifting rope 12 is evenly applied to the arc-shaped clamping plate 31, and then transmitted to the outer wall of the steel pipe pile 9, so as to ensure that the pile body is balanced during lifting and there is no risk of unilateral tilting.

[0032] Step 3: The ring structure and adjustable clamping force of the clamping unit 2 ensure that the anti-slip pad 32 remains in close contact with the outer wall of the steel pipe pile 9. Workers mark the positions on the steel pipe pile 9 for cutting. After cutting, an external truck crane is activated. The lifting force is transmitted sequentially to the clamping unit 2 through the triangular lifting device 11, the lifting rope 12, and the first lifting lug 35. The friction between the clamping unit 2 and the steel pipe pile 9 is then converted into an upward lifting force, achieving a stable lifting of the pile head. During the lifting process, the balanced force characteristics of the triangular lifting device 11 combined with the stable clamping effect of the clamping unit ensures the safe lifting of the pile head to the designated position. After the operation is completed, the clamping unit can be quickly disassembled by loosening the connecting bolts 34, and the lifting ropes can be released to disassemble the clamping unit, adapting it to subsequent construction needs.

[0033] As another embodiment of the clamping unit, the clamping unit includes a clamping cylinder 41 for clamping the outer wall of the steel pipe pile, a positioning post 42 for clamping the inner wall of the steel pipe pile, an outer clamping airbag 43 detachably connected to the inner wall of the clamping cylinder 41, an inner clamping airbag 44 detachably connected to the positioning post 42, a first inflation branch pipe 48 fixedly connected to the outer clamping airbag 43, a second inflation branch pipe 47 fixedly connected to the inner clamping airbag 44, and a connection between the first inflation branch pipe 48 and the second inflation branch pipe 47. The system includes an inflation main pipe 49, a high-pressure air pump 40 connected to the inflation main pipe 49, an outer lifting lug 45 fixedly connected to the upper and lower ends of the clamping cylinder 41 for detachable connection with the lifting rope 12, an inner lifting lug 46 fixedly connected to the positioning column 42, a first rope 81 detachably connected to the inner lifting lug 46 for connecting the triangular lifting device 11, a marking component for marking the cutting position of the steel pipe pile on the clamping unit 2, and the high-pressure air pump 40 mounted on the truck crane and moving with the truck crane.

[0034] The clamping cylinder 41 is an annular cylindrical structure adapted to the curvature of the outer wall of the steel pipe pile 9. It is made of high-strength alloy material and its inner diameter is larger than that of a conventional steel pipe pile. It provides space for the installation and expansion of the outer clamping airbag 43. The positioning column 42 is set at the coaxial center of the clamping cylinder 41. It is a cylindrical solid structure and its outer diameter is smaller than that of a conventional steel pipe pile. It is used to insert into the steel pipe pile 9 to provide inner support.

[0035] The outer clamping airbag 43 is an annular airbag structure adapted to the curvature of the inner wall of the clamping cylinder 41. The outer ring surface of the outer clamping airbag 43 is detachably connected to the inner wall of the clamping cylinder 41. Multiple sets of outer clamping airbags 43 are provided, and adjacent outer clamping airbags 43 are connected through an outer connecting pipe 91. The inner clamping airbag 44 is an annular airbag structure adapted to the curvature of the outer wall of the positioning post 42. The inner ring surface of the inner clamping airbag 44 is detachably connected to the outer wall of the positioning post 42. Multiple sets of inner clamping airbags 44 are provided, and adjacent inner clamping airbags 44 are connected through an inner connecting pipe 92.

[0036] The outer ring surface of the outer clamping airbag 43 is fixedly connected to an outer hook and loop fastener male surface 711, and the inner wall of the clamping cylinder 41 is fixedly connected to an outer hook and loop fastener female surface 712. The outer clamping airbag 43 and the clamping cylinder 41 are fixedly bonded together by correspondingly attaching and bonding the outer hook and loop fastener male surface 711 and the outer hook and loop fastener female surface 712. The inner ring surface of the inner clamping airbag 44 is fixedly connected to an inner hook and loop fastener male surface 721, and the outer wall of the positioning post 42 is fixedly connected to an inner hook and loop fastener female surface 722. The inner clamping airbag 44 and the positioning post 42 are fixedly bonded together by correspondingly attaching and bonding the inner hook and loop fastener male surface 721 and the inner hook and loop fastener female surface 722.

[0037] The inner ring surface of the outer clamping airbag 43 and the outer ring surface of the inner clamping airbag 44 are both provided with concave and convex textures.

[0038] The inner wall of the clamping cylinder 41 has multiple annular mounting surfaces evenly distributed along the axial direction. Each mounting surface is fixedly connected to an outer hook and loop fastener female surface 712 for detachable installation of the outer clamping airbag 43. The outer clamping airbag 43 is a closed-loop annular airbag that precisely fits the mounting surface of the inner wall of the clamping cylinder 41. Its outer ring surface is fixedly provided with an outer hook and loop fastener male surface 711 that matches the outer hook and loop fastener female surface 712. The hook and loop fasteners are detachably bonded and fixed by corresponding fasteners, ensuring that the airbag fits the inner wall of the clamping cylinder 41 completely without wrinkles or gaps, and is easy to install and remove. Multiple sets of outer clamping airbags 43 are provided (preferably 2-4 sets). The upper and lower adjacent outer clamping airbags 43 are connected in series through the outer connecting pipe 91 to achieve synchronous inflation and expansion. The inner ring surface of each set of outer clamping airbags 43 is provided with evenly distributed concave and convex textures to increase the friction coefficient with the outer wall of the steel pipe pile 9 and improve the clamping and anti-slip effect.

[0039] The outer wall of the positioning post 42 is axially aligned with the position of the outer clamping airbag 43 and is fixedly connected with an inner Velcro female surface 722 for detachable installation of the inner clamping airbag 44. The inner clamping airbag 44 is a closed-loop annular airbag adapted to the curvature of the outer wall of the positioning post 42. Its inner ring surface is fixedly provided with an inner Velcro male surface 721 adapted to the inner Velcro female surface 722. Detachable bonding and fixation are achieved through Velcro fastening, ensuring that the inner clamping airbag 44 is coaxially aligned and tightly fitted with the outer wall of the positioning post 42. Multiple sets of inner clamping airbags 44 are also provided, corresponding one-to-one with the outer clamping airbags 43. The upper and lower adjacent inner clamping airbags 44 are connected in series through the inner connecting tube 92. Its outer ring surface is also provided with concave and convex textures to enhance the friction with the inner wall of the steel pipe pile 9, forming a two-way anti-slip fixation with the outer clamping airbag 43.

[0040] One end of the first inflation branch pipe 48 is fixedly connected to the uppermost set of outer clamping airbags 43, and the other end is connected to the inflation main pipe 49, used to deliver high-pressure gas to all the series-connected outer clamping airbags 43; one end of the second inflation branch pipe 47 is fixedly connected to the uppermost set of inner clamping airbags 44, and the other end is connected to the inflation main pipe 49, used to deliver high-pressure gas to all the series-connected inner clamping airbags 44; the inflation main pipe 49 is equipped with a bidirectional control valve, which can control the inflation / deflation rhythm of the outer and inner clamping airbags respectively, ensuring that the bidirectional clamping force is applied synchronously; the high-pressure air pump 40 is fixedly connected to the end of the inflation main pipe 49 away from the branch pipe, which can provide a stable high-pressure air source. By adjusting the output pressure of the air pump, the degree of airbag expansion can be precisely controlled, thereby adjusting the clamping force, adapting to steel pipe piles 9 with different wall thicknesses and materials, avoiding excessive clamping that damages the pile body or insufficient clamping force that leads to slippage.

[0041] The outer lifting lugs 45 are symmetrically fixedly connected to the upper and lower end faces of the clamping cylinder 41, with at least three lugs on each end face, evenly distributed around the circumference of the clamping cylinder 41. Each outer lifting lug 45 has a connection hole and is detachably connected to the lifting rope 12 via a shackle, ensuring that the lifting force is evenly transmitted to the clamping cylinder 41 and preventing the clamping cylinder from shifting under force. The inner lifting lugs 46 are fixedly connected to the top of the positioning column 42 in a circular array. Each inner lifting lug 46 is detachably connected to the first rope 81 via a wire rope clamp. The end of the first rope 81 away from the inner lifting lug 46 converges and connects to the triangular lifting device 11, forming a double lifting connection structure of "outer lifting rope + inner rope", which further disperses the lifting force and ensures the coaxiality of the clamping cylinder 41 and the positioning column 42, preventing relative displacement between the two during the lifting process.

[0042] When the steel pipe pile is cut to a long length or requires enhanced clamping stability, and multiple sets of clamping units 2 are required, multiple sets of second ropes 82 are installed between clamping units 2. The clamping cylinders 41 and positioning columns 42 of two adjacent sets of clamping units are detachably connected by the second ropes 82. The outer lifting lugs 45 at the upper and lower ends of each clamping cylinder 41 correspond one-to-one. The two ends of the second rope 82 are fixed to the corresponding outer lifting lugs 45 by wire rope clamps. The inner lifting lugs 46 at the upper and lower ends of the positioning column 42 correspond one-to-one. The two ends of the second rope 82 are fixed to the corresponding inner lifting lugs 46 by wire rope clamps, ensuring that multiple sets of clamping cylinders 41 are parallel and evenly distributed along the axial direction of the steel pipe pile 9, with the spacing set according to the length and stability requirements of the steel pipe pile.

[0043] The marking assembly includes a slider 51 that slides along the outer peripheral wall of the clamping cylinder 41, a vertical support cylinder 52 fixedly connected to the slider 51, a vertical rod 53 passing through the vertical support cylinder 52, a clamping bolt 57 threaded through the cylinder wall of the vertical support cylinder 52, a transverse support cylinder 54 fixedly connected to the bottom end of the vertical rod 53, a transverse threaded rod 55 threaded through the transverse support cylinder 54, and a marking pen 56 fixedly connected to the front end of the transverse threaded rod 55. The end face of the clamping bolt 57 abuts against the outer wall of the vertical rod 53.

[0044] The slider 51 can slide freely and be positioned along the circumference of the clamping cylinder 41 to adapt to different circumferential cutting position requirements; the vertical support cylinder 52 is vertically fixedly connected to the outer wall of the slider 51, and its interior is a hollow structure for inserting the vertical rod 53; the vertical rod 53 can slide up and down along the vertical support cylinder 52 to adjust the height of the marking pen 56; the clamping bolt 57 is threaded through the cylinder wall of the vertical support cylinder 52, and a rubber pad is fixedly connected to the end face of the clamping bolt 57, which abuts against the outer wall of the vertical rod 53. By tightening the clamping bolt, the vertical rod 53 can be fixed at the target height to ensure that it does not break during the marking process. The horizontal support cylinder 54 is vertically fixed to the bottom end of the vertical rod 53. It has an internal thread that matches the external thread of the horizontal threaded rod 55. The horizontal threaded rod 55 passes through the horizontal support cylinder 54 and its extension length can be adjusted by rotation. A marking pen 56 is fixedly connected to its front end. The marking pen 56 is made of wear-resistant and easily colored pen tip material, which can clearly mark the cutting line on the outer wall of the steel pipe pile 9. By sliding the slider 51 and adjusting the height of the vertical rod 53 and the extension length of the horizontal threaded rod 55, the three-dimensional precise positioning of the cutting position can be achieved, ensuring that the cutting line is straight and accurate, and providing a clear benchmark for subsequent cutting operations.

[0045] Multiple leveling bubbles 6 are fixedly connected to the outer peripheral wall of the clamping cylinder 41. The leveling bubbles 6 are evenly distributed along the circumference of the outer peripheral wall of the clamping cylinder 41 and are used to monitor the horizontal state of the clamping cylinder 41 in real time. Construction personnel can quickly adjust the posture of the device by observing the leveling bubbles to ensure that the clamping unit is in horizontal position, thereby ensuring the horizontality of the cutting surface of the steel pipe pile 9 and avoiding cutting errors caused by device tilting.

[0046] Working principle: Step 1: Hook the triangular lifting device 11 onto the hook of the truck crane, and detachably connect the lifting rope 12 to the outer lifting lug 45 at the upper end of the clamping cylinder 41 using a wire rope clamp. At the same time, connect one end of the first rope 81 to the inner lifting lug 46 at the top of the positioning column 42, and then converge and fix the other end to the triangular lifting device 11. When the cutting length of the steel pipe pile 9 is long or when enhanced stability is required, multiple sets of clamping units 2 are arranged coaxially along the axial direction of the steel pipe pile 9. The upper and lower units are mechanically fixed by the second rope 82. The outer lifting lugs 45 of the upper and lower adjacent clamping cylinders 41 correspond one-to-one, and the inner lifting lugs 46 of the positioning column 42 correspond one-to-one. The two ends of the second rope 82 are fixed to the corresponding outer lifting lugs 45 by wire rope clamps, and the two ends of the second rope 82 are fixed to the corresponding inner lifting lugs 46 by wire rope clamps. This ensures that the multiple sets of clamping cylinders 41 are parallel and evenly distributed along the axial direction of the steel pipe pile 9, and the spacing is set according to the length and stability requirements of the steel pipe pile 9.

[0047] Step 2: Hoist the clamping unit 2 above the steel pipe pile 9, insert the positioning column 42 coaxially into the inside of the steel pipe pile 9, and fit the clamping cylinder 41 onto the outside of the steel pipe pile 9; The high-pressure air pump 40 is moved to the work area with the truck crane. The inflation main pipe 49 is sealed and connected to the high-pressure air pump 40. The two-way control valve on the inflation main pipe 49 is opened. After the high-pressure air pump 40 is started, it outputs a stable high-pressure air source. The gas is diverted through the inflation main pipe 49 to the first inflation branch pipe 48 and the second inflation branch pipe 47, and injected into the series-connected outer clamping airbag 43 and inner clamping airbag 44, respectively, to achieve bidirectional synchronous inflation and expansion.

[0048] After the outer clamping airbag 43 expands, it fits tightly against the outer wall of the steel pipe pile 9, and after the inner clamping airbag 44 expands, it precisely abuts against the inner wall of the steel pipe pile 9, forming a bidirectional clamping force of "outer clamp and inner support". By adjusting the output pressure of the high-pressure air pump 40 (adjustable from 0.3 to 0.8 MPa), the degree of airbag expansion can be precisely controlled, thus adapting to steel pipe piles 9 of different diameters and wall thicknesses. At the same time, the concave and convex textures on the inner ring surface of the outer clamping airbag 43 and the outer ring surface of the inner clamping airbag 44 greatly increase their friction coefficient with the pile wall. Combined with the bidirectional clamping force, it prevents the pile from slipping during lifting or cutting.

[0049] The horizontal status of the clamping unit 2 is monitored in real time by the leveling bubbles 6 evenly distributed around the outer circumference of the clamping cylinder 41. The construction personnel adjust the posture of the device until all leveling bubbles 6 show horizontality, ensuring that the clamping unit 2 is parallel to the cutting reference surface, thus providing a basic guarantee for the horizontality of the cutting surface.

[0050] Once the pressure of the outer clamping airbag 43 and the inner clamping airbag 44 reaches the pressure standard required for lifting, the lifting operation can be carried out.

[0051] Step 3: Adjust the marking position by sliding slider 51 around the clamping cylinder 41, slide the vertical rod 53 up and down to match the cutting height, and rotate the horizontal threaded rod 55 to adjust the extension length of the marking pen 56 so that the pen tip fits tightly against the outer wall of the steel pipe pile 9; tighten the clamping bolt 57 on the vertical support cylinder 52, so that the rubber pad on its end face abuts against the outer wall of the vertical rod 53 to prevent the rod from loosening during marking; slide slider 51 around the pile body to draw a straight and precise closed cutting line, achieving three-dimensional precise positioning of the cutting position. Step 4: After the steel pipe pile 9 is cut, start the truck crane. The lifting force is transmitted to the clamping unit 2 through the triangular lifting tool 11, the lifting rope 12 / first rope 81, the outer lifting lug 45 / inner lifting lug 46 in sequence. Then, the friction between the clamping unit and the pile body is converted into an upward lifting force to achieve stable lifting of the pile head.

[0052] After the pile head is lifted to the designated position, the high-pressure air pump 40 is turned off, the two-way control valve is opened to release the gas in the airbag, the outer clamping airbag 43 and the inner clamping airbag 44 contract and reset, and disengage from the wall of the steel pipe pile 9, so that the next steel pipe pile 9 can be lifted, which is adapted to subsequent cyclic operations and greatly improves construction efficiency.

[0053] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0054] The present invention has been described above with reference to preferred embodiments, but the scope of protection of the present invention is not limited thereto. All technical solutions falling within the scope of the claims are within the scope of protection of the present invention. Various modifications can be made to the present invention, and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A stable hoisting device for cutting pile head of a steel pipe pile, characterized in that: The utility model provides a kind of steel pipe pile cutting device, including hoisting connection component (1) and embrace unit (2);The hoisting connection component (1) includes triangular spreader (11), and the triangular spreader (11) upper end is used to be detachably connected with external hoisting equipment, and the hoisting rope (12) is detachably connected with embrace unit (2), for stable transmission hoisting force;The embrace unit (2) is annular structure adapted to the outer wall of steel pipe pile, can adjust embrace amplitude along radial direction, adapts steel pipe pile of different diameter specifications, and the embrace unit (2) is tightly combined with the outer wall of steel pipe pile by adjustable embrace force, ensure that pile body is not deviated, not off in the process of cutting pile head hoisting.

2. The stable hoisting device for cutting pile head of a steel pipe pile according to claim 1, characterized in that: The embrace unit includes two pieces of arc-shaped embrace plate (31) hinged to each other at one end, anti-slip pad (32) fixedly connected to the inner wall of the arc-shaped embrace plate (31), connecting plate (33) fixedly connected to the other end of the arc-shaped embrace plate (31), connecting bolt (34) threaded in the connecting plate (33), two pieces of arc-shaped embrace plate (31) form an annular structure adapted to the steel pipe pile, and the upper end and the lower end of the arc-shaped embrace plate (31) are fixedly connected to the first lifting lug (35) for detachable connection with the hoisting rope (12).

3. The stable hoisting device for cutting pile head of a steel pipe pile according to claim 1, characterized in that: The embrace unit includes embrace cylinder (41) for embracing the outer wall of steel pipe pile, positioning column (42) for embracing the inner wall of steel pipe pile, outer side embrace air bag (43) detachably connected to the inner wall of the embrace cylinder (41), inner side embrace air bag (44) detachably connected to the positioning column (42), first inflation branch pipe (48) fixedly connected to the outer side embrace air bag (43), second inflation branch pipe (47) fixedly connected to the inner side embrace air bag (44), inflation main pipe (49) in communication with the first inflation branch pipe (48) and the second inflation branch pipe (47), high-pressure air pump (40) in communication with the inflation main pipe (49), the upper end and the lower end of the embrace cylinder (41) are fixedly connected to the outer side lifting lug (45) for detachable connection with the hoisting rope (12), the positioning column (42) is fixedly connected with the inner side lifting lug (46), the inner side lifting lug (46) is detachably connected with the first rope (81), and the first rope (81) is used to connect the triangular spreader (11); The embrace unit (2) is provided with a marking assembly for marking the cutting position of the steel pipe pile.

4. The stable hoisting device for cutting pile head of a steel pipe pile according to claim 3, characterized in that: The outer side holding air bag (43) is a ring-shaped air bag structure matched with the curvature of the inner wall of the holding cylinder (41), the outer ring surface of the outer side holding air bag (43) is detachably connected to the inner wall of the holding cylinder (41), the outer side holding air bag (43) is provided in multiple groups, and the upper and lower adjacent outer side holding air bags (43) are connected through the outer side connecting pipe (91); the inner side holding air bag (44) is a ring-shaped air bag structure matched with the curvature of the outer wall of the positioning column (42), the inner ring surface of the inner side holding air bag (44) is detachably connected to the outer wall of the positioning column (42), and the inner side holding air bag (44) is provided in multiple groups, and the upper and lower adjacent inner side holding air bags (44) are connected through the inner side connecting pipe (92).

5. The stable hoisting device for cutting pile head of a steel pipe pile according to claim 4, characterized in that: The outer ring surface of the outer side holding air bag (43) is fixedly connected with an outer side Velcro male face (711), the inner wall of the holding cylinder (41) is fixedly connected with an outer side Velcro female face (712), the outer side holding air bag (43) and the holding cylinder (41) are fixedly bonded through corresponding bonding of the outer side Velcro male face (711) and the outer side Velcro female face (712); the inner ring surface of the inner side holding air bag (44) is fixedly connected with an inner side Velcro male face (721), the outer wall of the positioning column (42) is fixedly connected with an inner side Velcro female face (722), and the inner side holding air bag (44) and the positioning column (42) are fixedly bonded through corresponding bonding of the inner side Velcro male face (721) and the inner side Velcro female face (722).

6. The stable hoisting device for cutting pile head of a steel pipe pile according to claim 4, characterized in that: The inner ring surface of the outer side holding air bag (43) and the outer ring surface of the inner side holding air bag (44) are provided with concave-convex textures.

7. The stable hoisting device for cutting pile head of a steel pipe pile according to claim 3, characterized in that: The marking assembly comprises a sliding block (51) sliding along the outer peripheral wall of the holding cylinder (41), a vertical supporting cylinder (52) fixedly connected to the sliding block (51), a vertical straight rod (53) penetratingly arranged in the vertical supporting cylinder (52), a compression bolt (57) threadedly penetratingly arranged on the cylinder wall of the vertical supporting cylinder (52), a horizontal supporting cylinder (54) fixedly connected to the bottom end of the vertical straight rod (53), a horizontal threaded rod (55) threadedly penetratingly arranged in the horizontal supporting cylinder (54), and a marking pen (56) fixedly connected to the front end of the horizontal threaded rod (55), and the end surface of the compression bolt (57) abuts against the outer wall of the vertical straight rod (53).

8. The stable hoisting device for cutting pile head of a steel pipe pile according to claim 7, characterized in that: A plurality of level bubbles (6) are fixedly connected to the outer peripheral wall of the holding cylinder (41), and the level bubbles (6) are uniformly distributed in the circumferential direction of the outer peripheral wall of the holding cylinder (41).

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