A safe hoisting device for prefabricated pipe piles

Abstract

The utility model relates to pipe pile hoisting technical field discloses a safe hoisting device of prefabricated pipe pile, including outer fixed part, be provided with the suspension department on outer fixed part, and the first end of outer fixed part is provided with the open mouth, and the open mouth is suitable for along the axial direction of outer fixed part and is set up on the pipe pile end portion, adjusting assembly, adjusting assembly sets up on the second end of outer fixed part, and adjusting assembly includes telescopic sleeve, and the telescopic direction of telescopic sleeve is parallel to the radial direction of outer fixed part and sets up. The telescopic sleeve of adjusting assembly of the utility model sets up on the second end of outer fixed part, is parallel to the radial direction, and abuts the inner wall of pipe pile under the action of driving force, can effectively make up the influence of pipe pile outer diameter size difference, ensure that the outer wall surface of pipe pile and outer fixed part inner chamber surface are closely and abut, compared with the inner fixed type and avoid the loosening and falling risk of fixed part, compared with the outer fixed type and enhance the fixed tightness, prevent pipe pile from relatively sliding, tilting or separating in hoisting, hoisting and carrying, improve hoisting operation safety and stability.

Description

Technical Field

[0001] This utility model relates to the field of pipe pile hoisting technology, specifically to a safe hoisting device for precast pipe piles. Background Technology

[0002] Prestressed concrete pipe piles are hollow cylindrical precast concrete components manufactured using pre-tensioning prestressing technology and centrifugal molding. They mainly consist of the pile body, end plates, and steel sleeves. With their significant advantages such as high single-pile bearing capacity, stable and reliable quality, high construction efficiency, and environmental friendliness, they are widely used in the foundation construction of various projects, including industrial and civil buildings, bridges, and ports.

[0003] In the hoisting operation of prestressed concrete pipe piles, hoisting devices are typically used to fix the pipe piles. Currently, the mainstream hoisting devices can be divided into two categories: internal fixing and external fixing. Internal fixing hoisting devices require fixing components to be installed inside the pipe pile. However, during hoisting, if the pipe pile shakes or experiences uneven stress, the fixing components are prone to loosening and falling off, significantly increasing the risk of the pipe pile falling. External fixing hoisting devices mainly rely on clamps and other components to hold the pipe pile from the outside. However, slight differences in the outer diameter of different pipe piles make it difficult for the external fixing device to fit tightly against the pipe pile. During lifting and transportation, the pipe pile is prone to relative sliding, tilting, or even detaching from the hoisting device, which not only seriously threatens the safety of the hoisting operation but may also cause significant harm to surrounding personnel and equipment. Utility Model Content

[0004] In view of this, the present invention provides a safe hoisting device for precast pipe piles to solve the problem of unstable fixation of pipe piles by hoisting devices in the hoisting operation of prestressed pipe piles in the prior art.

[0005] This utility model provides a safe hoisting device for precast pipe piles, including:

[0006] The external fixing component is cylindrical, and a suspension part is provided on the external fixing component. The first end of the external fixing component is provided with an opening, which is suitable for being sleeved on the end of the pipe pile along the axial direction of the external fixing component.

[0007] An adjustment component is provided on the second end of the external fixator. The adjustment component includes a telescopic sleeve, the telescopic sleeve being arranged in a telescopic direction parallel to the radial direction of the external fixator. When the external fixator is sleeved on the end of the pipe pile, the telescopic sleeve is adapted to abut against the inner wall of the pipe pile under the action of driving force, while the outer wall surface of the pipe pile abuts against the inner cavity surface of the external fixator.

[0008] Optionally, the adjustment assembly further includes an adjustment member and an adjustment rod. The external fixing member has an adjustment hole in the axial direction on its second end. The adjustment rod is inserted into the adjustment hole. The adjustment member is fixedly disposed on the first end of the adjustment rod. The telescopic kit is disposed on the second end of the adjustment rod. The adjustment member is pushed axially by an external force to move the adjustment rod in the axial direction and to make the telescopic kit extend and retract in the radial direction.

[0009] Optionally, the telescopic kit includes:

[0010] At least one set of telescopic structures, the telescopic structure including at least two telescopic members, the telescopic members including a first segment and a second segment, one end of the first segment being provided with an abutment part, and the other end being rotatably connected to one end of the second segment;

[0011] At least one telescopic pusher is fixedly mounted on the adjusting rod, and the other end of the second section of the telescopic pusher is rotatably connected to the telescopic pusher;

[0012] The first limiting tube is fixedly installed in the adjusting hole along the axial direction of the external fixing member. The adjusting rod is inserted into the first limiting tube. The first limiting tube is provided with a first clearance hole suitable for avoiding the movement of the second segment.

[0013] Multiple second limiting tubes are provided, the telescopic member is adapted to the second limiting tube, the second limiting tube is arranged on the first limiting tube along the radial direction of the external fixing member, the first segment is at least partially arranged in the second limiting tube, the abutting part is exposed in the second limiting tube, and the second limiting tube is provided with a second clearance hole suitable for avoiding the movement of the second segment.

[0014] Optionally, the outer circumferential surface of the adjusting rod is provided with an external thread, and a portion of the inner wall surface of the first limiting tube is provided with an internal thread that mates with it. By rotating the adjusting member, the adjusting rod can be moved axially within the first limiting tube.

[0015] Optionally, the telescopic structure is provided in two sets, with the two sets of telescopic structures spaced apart on the adjusting rod along the axial direction of the external fixing member.

[0016] Optionally, each set of telescopic structures includes two telescopic members, which are coaxially arranged on both sides of the adjusting rod.

[0017] Optionally, the first limiting tube is provided with a limiting component, the limiting component including a limiting ring disposed in the first limiting tube and a limiting member connected to the adjusting rod through an elastic member. When the telescopic member abuts against the inner wall of the pipe pile, the limiting member is engaged in the limiting ring.

[0018] Optionally, the limiting member is a right-angled triangular pyramid limiting member, with one right-angled side of the right-angled triangular pyramid limiting member located near the telescopic member and the other right-angled side located near the adjusting rod.

[0019] Optionally, the axial length of the external fixing member is 20%-30% of the length of the pipe pile.

[0020] Optionally, the inner diameter of the external fixing member is at most 2% larger than the outer diameter of the pipe pile.

[0021] Beneficial effects

[0022] The safety hoisting device for precast pipe piles provided by this utility model includes an external fixing component, which is cylindrical, with a suspension part provided on the external fixing component, and an opening at the first end of the external fixing component, the opening being adapted to be sleeved on the end of the pipe pile along the axial direction of the external fixing component; and an adjustment component, which is disposed on the second end of the external fixing component, the adjustment component including a telescopic sleeve, the telescopic sleeve being arranged parallel to the radial direction, when the external fixing component is sleeved on the end of the pipe pile, the telescopic sleeve being adapted to abut against the inner wall of the pipe pile under the action of driving force, while the outer wall surface of the pipe pile abuts against the inner cavity surface of the external fixing component. This precast pipe pile safety hoisting device features an open design where the external fixing component is fitted onto the end of the pipe pile, allowing for rapid installation. The suspension portion on the external fixing component facilitates hoisting operations. The telescopic assembly of the adjustment component is located at the second end of the external fixing component, parallel to the radial direction. Under the action of driving force, it abuts against the inner wall of the pipe pile, effectively compensating for the influence of differences in the outer diameter of the pipe pile. This ensures a tight fit between the outer wall surface of the pipe pile and the inner cavity surface of the external fixing component. Compared to internal fixing, this avoids the risk of the fixing component loosening and falling off. Compared to external fixing, it enhances the tightness of the fixation, preventing the pipe pile from sliding, tilting, or detaching during lifting and transportation, thus improving the safety and stability of the hoisting operation. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional schematic diagram of a safe hoisting device for precast pipe piles according to an embodiment of the present utility model;

[0025] Figure 2 This is a cross-sectional schematic diagram of the first end side of the external fixing member in an embodiment of this utility model;

[0026] Figure 3 This is a cross-sectional schematic diagram of the second end side of the external fixing member in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the limiting member in an embodiment of the present utility model;

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. External fixing component; 11. Suspension part; 21. Adjusting component; 22. Adjusting rod; 31. Telescopic component; 311. First section; 312. Second section; 32. Telescopic pushing component; 33. First limiting tube; 34. Second limiting tube; 41. Limiting ring; 42. Limiting component; 5. Pipe pile. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, a safe hoisting device for precast pipe piles is provided, comprising:

[0033] The external fixing member 1 is cylindrical, and a suspension part 11 is provided on the external fixing member 1. The first end of the external fixing member 1 is provided with an opening, which is suitable for being sleeved on the end of the pipe pile 5 along the axial direction of the external fixing member 1.

[0034] An adjustment component is provided on the second end of the outer fixing member 1. The adjustment component includes a telescopic sleeve. The telescopic sleeve is arranged in a direction parallel to the radial direction of the outer fixing member 1. When the outer fixing member 1 is sleeved on the end of the pipe pile 5, the telescopic sleeve is adapted to abut against the inner wall of the pipe pile 5 under the action of driving force, while the outer wall surface of the pipe pile 5 abuts against the inner cavity surface of the outer fixing member 1.

[0035] The safety hoisting device for precast pipe piles provided in this embodiment can be quickly installed by using an open design where the outer fixing part 1 is fitted onto the end of the pipe pile 5. The suspension part 11 on the outer fixing part 1 facilitates hoisting operations. The telescopic kit of the adjustment component is set at the second end of the outer fixing part 1, parallel to the radial direction of the outer fixing part 1. Under the action of driving force, it abuts against the inner wall of the pipe pile 5, which can effectively compensate for the influence of the difference in the outer diameter of the pipe pile 5 and ensure that the outer wall surface of the pipe pile 5 is tightly abutted against the inner cavity surface of the outer fixing part 1. Compared with the internal fixing type, it avoids the risk of the fixing part loosening and falling off. Compared with the external fixing type, it enhances the fixing tightness and prevents the pipe pile 5 from sliding, tilting or falling off during hoisting and transportation, thereby improving the safety and stability of hoisting operations.

[0036] It should be noted that the specific dimensions of the external fastener 1 need to be customized according to the dimensions of the pipe pile 5 to be hoisted.

[0037] Specifically, the allowable deformation rate of the concrete pipe diameter is generally 2%, which determines that the inner diameter of the external fastener 1 can be at most 2% larger than the outer diameter of the pipe pile 5. Based on the customized design of the ratio of the inner diameter of the external fastener 1 to the outer diameter of the pipe pile 5, it is possible to ensure that a reasonable deformation space is reserved between the external fastener 1 and the pipe pile 5 to meet the deformation requirements of the concrete pipe, and to ensure that the external fastener 1 and the pipe pile 5 have sufficient contact area to improve the fixing effect.

[0038] Furthermore, the axial length of the external fixing member 1 is 20%-30% of the length of the pipe pile 5.

[0039] It should be noted that the axial length of the external fixing component 1 is selected as 20%-30% of the length of the pipe pile 5, mainly based on the structural characteristics and stress conditions of the pipe pile 5. During the hoisting process, the ends of the pipe pile 5 need to withstand significant tensile and shear forces. This length range can cover the critical stress areas at the ends of the pipe pile 5, ensuring the effective contact area between the external fixing component 1 and the pipe pile 5, while avoiding increasing the weight and cost of the device due to excessive length, or causing unstable fixation due to excessive shortness. At the same time, considering the size specifications of most pipe piles 5 and the actual construction operation space, this range can be adapted to different types of pipe piles 5, ensuring applicability in various engineering scenarios.

[0040] It is easy to understand that using an external fixing component 1 with an axial length of 20%-30% of the length of the pipe pile 5 can, on the one hand, ensure that the ends of the pipe pile 5 are fully fixed while maintaining the lightness of the hoisting device, reducing the difficulty of worker operation and the load pressure on the equipment, and improving hoisting efficiency; on the other hand, this length range can effectively disperse the stress during the hoisting of the pipe pile 5, avoid excessive local stress causing damage to the pipe pile 5 or failure of fixation, and enhance the safety of hoisting operations; in addition, a uniform length range facilitates production and standardized management, reduces the adaptation problems caused by the size difference of the external fixing component 1, and reduces production and maintenance costs.

[0041] Specifically, the suspension part 11 can be a lifting ring or a hook, depending on actual needs.

[0042] Furthermore, the adjustment assembly also includes an adjustment member 21 and an adjustment rod 22. The outer fixing member 1 has an adjustment hole in the axial direction on the second end. The adjustment rod 22 is inserted into the adjustment hole. The adjustment member 21 is fixedly installed on the first end of the adjustment rod 22. The telescopic kit is installed on the second end of the adjustment rod 22. The adjustment member 21 is pushed axially by an external force to move the adjustment rod 22 in the axial direction and to make the telescopic kit telescopic in the radial direction.

[0043] It should be noted that the pipe pile 5 can be quickly fixed by manual adjustment, which is low in cost and easy for on-site workers to operate.

[0044] In an optional embodiment, the adjustment mechanism can be electrically driven, replacing the adjusting member 21 with an electric push rod. The extension and retraction of the electric push rod is remotely controlled by a controller, which in turn drives the adjusting rod 22 and the telescopic kit to move. Furthermore, the telescopic kit can be replaced with a clamping block made of elastic rubber, utilizing elastic deformation to better adapt to uneven surfaces of the pipe pile 5.

[0045] Furthermore, the telescopic kit includes:

[0046] At least one set of telescopic structures, the set of telescopic structures includes at least two telescopic members 31, the telescopic member 31 includes a first section 311 and a second section 312, one end of the first section 311 is provided with an abutment part, and the other end is rotatably connected to one end of the second section 312.

[0047] At least one telescopic pusher 32 is fixedly mounted on the adjusting rod 22, and the other end of the second section 312 of the telescopic pusher 31 is rotatably connected to the telescopic pusher 32.

[0048] The first limiting tube 33 is fixedly installed in the adjusting hole along the axial direction of the outer fixing member 1. The adjusting rod 22 is inserted into the first limiting tube 33. The first limiting tube 33 is provided with a first clearance hole suitable for avoiding the movement of the second section 312.

[0049] Multiple second limiting tubes 34, telescopic members 31 are adapted to the second limiting tubes 34, the second limiting tubes 34 are arranged on the first limiting tubes 33 in the radial direction of the outer fixing member 1, the first section 311 is at least partially arranged in the second limiting tubes 34, the abutting part is exposed outside the second limiting tubes 34, and the second limiting tubes 34 are provided with a second clearance hole suitable for avoiding the movement of the second section 312.

[0050] Specifically, during installation, the first limiting fitting 33 is first fixed axially into the adjusting hole, and the adjusting rod 22 is inserted into the first limiting fitting 33. Multiple second limiting fittings 34 are fixed radially onto the first limiting fitting 33. At least part of the first section 311 of the telescopic member 31 is placed inside the corresponding second limiting fitting 34, with the abutting portion protruding from the second limiting fitting 34. The first section 311 and the second section 312 of the telescopic member 31 are rotatably connected, and the other end of the second section 312 is rotatably connected to the telescopic pusher 32, which is fixed to the adjusting rod 22. When the pipe pile 5 needs to be fixed, the adjusting member 21 is pushed to move the adjusting rod 22 axially, causing the telescopic pusher 32 to move accordingly, rotating the second section 312 of the telescopic member 31 around the connection point, and pushing the first section 311 radially out of the second limiting fitting 34 until the abutting portion tightly abuts against the inner wall of the pipe pile 5.

[0051] In simple terms, the telescopic kit, through multiple sets of telescopic structures and the telescopic pusher 32, can apply abutment force to the inner wall of the pipe pile 5 from multiple directions, ensuring that the pipe pile 5 is subjected to uniform force and effectively preventing the pipe pile 5 from tilting during hoisting. The first limiting pipe 33 and the second limiting pipe 34 guide and limit the movement of the telescopic component 31, preventing the telescopic component 31 from deviating during operation and ensuring the stability and reliability of the telescopic action. This structural design allows the telescopic kit to flexibly adapt to pipe piles 5 of different sizes, enhancing the versatility of the hoisting device. At the same time, the segmented rotating connection of the telescopic component 31 can better fit the uneven surface of the inner wall of the pipe pile 5, improving the tightness and firmness of the fixation.

[0052] Specifically, the abutment part is an arc-shaped metal wire with a certain degree of toughness, and multiple wires can be set to increase the contact area with the inner wall of the pipe pile 5.

[0053] Furthermore, the outer circumferential surface of the adjusting rod 22 is provided with an external thread, and a portion of the inner wall surface of the first limiting tube 33 is provided with an internal thread that mates with it. By rotating the adjusting member 21, the adjusting rod 22 can move axially within the first limiting tube 33.

[0054] In a straightforward manner, the outer circumferential surface of the adjusting rod 22 is threaded into the inner wall of the first limiting fitting 33. The axial movement of the adjusting rod 22 is achieved by rotating the adjusting component 21. Compared to axial pushing, rotating the adjusting component 21 requires less effort and is easier to control, reducing the labor intensity of workers and improving installation efficiency. The threaded drive enables fine and precise adjustments, allowing for flexible adjustment of the telescopic kit's extension and retraction degree according to the actual size and surface condition of the pipe pile 5, ensuring a tight fit between the contact part and the inner wall of the pipe pile 5. In terms of stability, the self-locking characteristic formed by the threaded connection makes it difficult for the adjusting rod 22 to shift after it is fixed, effectively preventing the telescopic kit from loosening due to external forces during hoisting, further enhancing the safety and reliability of the pipe pile 5 hoisting, and also extending the service life of the hoisting device.

[0055] Furthermore, the telescopic structure consists of two sets, which are spaced apart on the adjusting rod 22 along the axial direction of the outer fixing member 1.

[0056] In an optional embodiment, the number of telescopic structures can be changed to one set, three sets or even more. One set is suitable for simplified fixing of smaller diameter pipe piles 5, while three sets or more can enhance the fixing effect on large diameter or heavy pipe piles 5. Alternatively, two sets of telescopic structures can be evenly distributed along the circumference of the outer fixing member 1 on the same cross section of the adjusting rod 22 to make the pipe pile 5 more evenly stressed.

[0057] Furthermore, a telescopic structure includes two telescopic components 31, which are coaxially arranged on both sides of the adjusting rod 22.

[0058] In an alternative embodiment, the two coaxial telescopic members 31 can be replaced with three or more coaxially arranged members to enhance the clamping force against the inner wall of the pipe pile 5.

[0059] Furthermore, a limiting component is provided on the first limiting tube 33. The limiting component includes a limiting ring 41 disposed in the first limiting tube 33 and a limiting member 42 connected to the adjusting rod 22 through an elastic member. When the telescopic member 31 abuts against the inner wall of the pipe pile 5, the limiting member 42 is engaged in the limiting ring 41.

[0060] In a straightforward manner, when the expansion joint 31 abuts against the inner wall of the pipe pile 5, the limiting member 42, under the action of the elastic member, engages with the limiting ring 41, effectively preventing the adjusting rod 22 from rotating or shifting unexpectedly due to vibration or impact during hoisting. This ensures that the expansion joint 31 maintains a stable abutment state and prevents the pipe pile 5 from loosening. The elastic member provides the pre-tightening force required for engagement and allows the adjusting rod 22 to be adjusted slightly within a certain range, ensuring that the expansion joint 31 fits tightly against the inner wall of the pipe pile 5. This structure also enables automatic locking after the expansion joint 31 is in place, reducing manual repeated inspection and adjustment operations, improving hoisting efficiency, and enhancing the overall reliability and safety of the hoisting device.

[0061] Furthermore, the limiting member 42 is a right-angled triangular pyramid limiting member, with one right-angled side of the right-angled triangular pyramid limiting member being located near the telescopic member 31, and the other right-angled side being located near the adjusting rod 22.

[0062] It should be noted that the right-angled triangular pyramid limiting component, with its sharp corner and distinct edges, can quickly and accurately engage with the limiting ring 41, forming a stable engagement that effectively restricts the movement of the adjusting rod 22. The right-angled edges are positioned close to the telescopic component 31 and the adjusting rod 22, which can reasonably distribute the force within the limited space, ensuring that the limiting component 42 is not easily deformed or displaced when subjected to external forces during hoisting, and ensuring that the telescopic component 31 stably abuts against the inner wall of the pipe pile 5. At the same time, this shape of the limiting component 42 is easy to process and manufacture, reducing production costs, and is convenient to install and disassemble, facilitating later maintenance and repair.

[0063] In an optional embodiment, a hemispherical limiting member can also be used, which uses its rounded curved surface to form a surface contact with the limiting ring 41 to distribute the force and reduce wear; or a wedge-shaped limiting member can be used to enhance the limiting effect through the self-locking characteristics of the inclined surface.

[0064] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A safe hoisting device for precast pipe piles, characterized in that, include: The external fixing member (1) is cylindrical, and a suspension part (11) is provided on the external fixing member (1). The first end of the external fixing member (1) is provided with an opening, which is suitable for being sleeved on the end of the pipe pile (5) along the axial direction of the external fixing member (1). An adjustment component is provided on the second end of the external fixing member (1). The adjustment component includes a telescopic kit. The telescopic kit is arranged in a direction parallel to the radial direction of the external fixing member (1). When the external fixing member (1) is sleeved on the end of the pipe pile (5), the telescopic kit is adapted to abut against the inner wall of the pipe pile (5) under the action of driving force, while the outer wall surface of the pipe pile (5) abuts against the inner cavity surface of the external fixing member (1).

2. The safety hoisting device for precast pipe piles according to claim 1, characterized in that, The adjustment assembly further includes an adjustment member (21) and an adjustment rod (22). The external fixing member (1) has an adjustment hole in the axial direction on its second end. The adjustment rod (22) is inserted into the adjustment hole. The adjustment member (21) is fixedly installed on the first end of the adjustment rod (22). The telescopic kit is installed on the second end of the adjustment rod (22). The adjustment member (21) is pushed axially by an external force to move the adjustment rod (22) in the axial direction and to make the telescopic kit perform telescopic movements in the radial direction.

3. The safety hoisting device for precast pipe piles according to claim 2, characterized in that, The telescopic kit includes: At least one set of telescopic structures, the telescopic structure including at least two telescopic members (31), the telescopic member (31) including a first section (311) and a second section (312), one end of the first section (311) is provided with an abutment part, and the other end is rotatably connected to one end of the second section (312); At least one telescopic pusher (32) is fixedly mounted on the adjusting rod (22), and the other end of the second section (312) of the telescopic member (31) is rotatably connected to the telescopic pusher (32); The first limiting tube (33) is fixedly installed in the adjusting hole along the axial direction of the external fixing member (1). The adjusting rod (22) is inserted into the first limiting tube (33). The first limiting tube (33) is provided with a first clearance hole suitable for avoiding the movement of the second segment (312). Multiple second limiting tubes (34), the telescopic member (31) is adapted to the second limiting tubes (34), the second limiting tubes (34) are arranged on the first limiting tubes (33) in the radial direction of the external fixing member (1), the first segment (311) is at least partially arranged in the second limiting tubes (34), the abutting part is exposed on the second limiting tubes (34), and the second limiting tubes (34) are provided with a second clearance hole suitable for avoiding the movement of the second segment (312).

4. The safety hoisting device for precast pipe piles according to claim 3, characterized in that, The adjusting rod (22) has an external thread on its outer circumferential surface, and the inner wall of the first limiting tube (33) has an internal thread that mates with it. By rotating the adjusting member (21), the adjusting rod (22) can move axially within the first limiting tube (33).

5. The safe hoisting device for precast pipe piles according to any one of claims 3-4, characterized in that, The telescopic structure consists of two sets, which are spaced apart on the adjusting rod (22) along the axial direction of the external fixing member (1).

6. The safety hoisting device for precast pipe piles according to claim 5, characterized in that, Each telescopic structure includes two telescopic components (31), which are coaxially arranged on both sides of the adjusting rod (22).

7. The safety hoisting device for precast pipe piles according to any one of claims 3-4, characterized in that, The first limiting pipe fitting (33) is provided with a limiting component, which includes a limiting ring (41) disposed in the first limiting pipe fitting (33) and a limiting member (42) connected to the adjusting rod (22) through an elastic member. When the telescopic member (31) abuts against the inner wall of the pipe pile (5), the limiting member (42) is engaged in the limiting ring (41).

8. The safety hoisting device for precast pipe piles according to claim 7, characterized in that, The limiting member (42) is a right-angled triangular pyramid limiting member. One right-angled side of the right-angled triangular pyramid limiting member is located near the telescopic member (31), and the other right-angled side is located near the adjusting rod (22).

9. The safety hoisting device for precast pipe piles according to any one of claims 1-4, characterized in that, The axial length of the external fixing member (1) is 20%-30% of the length of the pipe pile (5).

10. The safety hoisting device for precast pipe piles according to any one of claims 1-4, characterized in that, The inner diameter of the external fastener (1) is at most 2% larger than the outer diameter of the pipe pile (5).

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