Hoist for assembling prefabricated vertical shafts

Abstract

The utility model discloses a kind of lifting appliances for assembly type vertical shaft prefabricated pipe section hoisting, comprising: base frame;Pipe body limiting frame, including fixedly arranged on base frame fixed frame, and multiple limiting plates are arranged along the circumferential direction of prefabricated pipe section and fixedly arranged on fixed frame, first hoisting part for lifting equipment hanging is equipped on the fixed frame;Suspender, vertically slidingly set on the center of fixed frame corresponding to prefabricated pipe section, and first limiting part and second limiting part for respectively limiting upper movement and lower movement of suspender are set on suspender, and the top of suspender is equipped with second hoisting part for lifting equipment hanging, and the bottom of suspender is fixedly arranged with counterweight;Supporting rod assembly, supporting rod assembly is arranged as multiple groups along the circumferential direction of prefabricated pipe section;The lifting appliance for assembly type vertical shaft prefabricated pipe section hoisting provided in the application has the advantages of improving construction safety, ensuring hoisting accuracy and improving construction efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a lifting tool for hoisting prefabricated pipe sections in prefabricated vertical shafts. Background Technology

[0002] Prefabricated shaft construction is a modern construction method that involves vertically stacking multiple prefabricated pipe sections to form the shaft. Compared with traditional monolithic cast-in-place structures, this method significantly improves construction efficiency. Currently, the industry commonly uses a method of drilling holes in the prefabricated pipe sections to install lifting lugs, and then using lifting equipment to hook onto the lugs for hoisting operations. However, in the construction of prefabricated shafts with a depth exceeding 5 meters and more than 5 pipe sections, this traditional hoisting method has revealed many technical shortcomings.

[0003] First, the existing hoisting method poses serious safety hazards. After each precast pipe section is hoisted into place, workers must descend into the narrow vertical shaft to retrieve the hooks and disassemble the lifting lugs. Due to the limited space in deep shaft construction, personnel movement is extremely inconvenient, and frequent entry and exit from the shaft significantly increases the risk of accidents such as falls from heights. Second, the traditional hoisting method cannot guarantee the vertical accuracy of the precast pipe sections. When docking with lower pipe sections, the sections are prone to tilting, making alignment difficult, especially when installing sections near the bottom of the shaft. Workers often need to descend to the bottom to manually straighten them, further increasing construction risks. Furthermore, this hoisting method also suffers from low construction efficiency. Each pipe section requires individual installation and disassembly of the lifting lugs, making the entire hoisting process time-consuming and labor-intensive.

[0004] Therefore, it is necessary to develop and design a lifting tool for hoisting prefabricated pipe sections in assembled vertical shafts, which is expected to improve the verticality of the pipe sections during the hoisting process; at the same time, it eliminates the need for workers to go down into the shaft to disassemble the lifting lugs or unhook the hooks, thereby improving work efficiency and construction safety. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a lifting tool for hoisting prefabricated pipe sections in prefabricated vertical shafts. By using this lifting tool, the verticality of the pipe sections during the hoisting process can be improved. At the same time, it eliminates the need for workers to go down into the shaft to disassemble the lifting lugs or remove the hooks, thereby improving work efficiency and construction safety. It is particularly suitable for the construction of prefabricated vertical shafts with greater depth and a larger number of pipe sections.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lifting device for hoisting prefabricated pipe sections in assembled vertical shafts, comprising: a base frame; a pipe body limiting frame, including a fixed frame fixed to the top of the base frame, and multiple limiting plates arranged circumferentially along the prefabricated pipe section and fixed to the fixed frame, wherein the limiting plates are conformally configured to fit the inner wall of the prefabricated pipe section and are used to adhere to the inner wall of the prefabricated pipe section during use, and the fixed frame is provided with a first lifting part for attaching lifting equipment; a lifting rod, vertically slidably disposed on the fixed frame corresponding to the center of the prefabricated pipe section, and the lifting rod is provided with a first limiting part and a second limiting part for limiting the upward and downward movement of the lifting rod, respectively. The precast pipe section includes a second lifting section at the top of the boom for attaching lifting equipment, and a counterweight fixed at the bottom of the boom. The support rod assembly consists of multiple sets arranged circumferentially along the precast pipe section. Each support rod assembly includes: a guide cylinder horizontally fixed to the base frame; a support rod with a sliding inner sleeve within the guide cylinder, the inner end of which is attached to the side wall of the counterweight and can extend outwards during the upward movement of the counterweight. In use, the extended support rod is inserted into a pre-set insertion hole on the precast pipe section; and a return spring located between the guide cylinder and the support rod to provide a restoring force for the support rod during the downward movement of the counterweight.

[0007] Furthermore, the base frame includes a connecting assembly, an upper support ring and a lower support ring arranged coaxially at a set interval, and the connecting assembly includes multiple connecting rods evenly distributed along the circumference of the upper support ring, with the two ends of the connecting rods fixedly connected to the upper support ring and the lower support ring respectively.

[0008] Furthermore, the fixing frame is a cross-shaped frame body and is fixed to the top of the upper support ring. The limiting plates are fixed at the four ends of the cross-shaped frame body respectively. A rod guide sleeve is fixed at the center of the cross-shaped frame body, and the rod sliding inner sleeve is set in the rod guide sleeve.

[0009] Furthermore, the first limiting part is a first limiting sleeve fixed on the boom and located below the boom guide sleeve, and the second limiting part is a second limiting sleeve fixed on the boom and located above the boom guide sleeve.

[0010] Furthermore, the first hoisting part includes a fixed plate and a U-shaped lifting lug that is fixedly connected to the fixed plate by an inverted snap. The two ends of the fixed plate are respectively welded and fixed to any two adjacent support rods of the cross-shaped frame.

[0011] Furthermore, the upper part of the counterweight is a conical structure, and the lower part of the counterweight is a cylindrical structure, with a rounded transition at the transition point between the conical and cylindrical structures; and when the boom is at the upper stop position, the inner end of the support rod abuts against the side wall of the cylindrical structure, and when the boom is at the lower stop position, the inner end of the support rod abuts against the side wall of the conical structure.

[0012] Furthermore, the inner end of the support rod has a ball-head structure.

[0013] Furthermore, the support rod assembly consists of four groups, which are evenly distributed along the circumference of the lower support ring; the guide cylinder is arranged radially along the lower support ring and welded and fixed to the lower support ring.

[0014] Furthermore, the reset spring is inner sleeved in the guide cylinder, and the support rod is provided with an annular limiting platform. One end of the reset spring abuts against the guide cylinder, and the other end of the reset spring abuts against the annular limiting platform.

[0015] Furthermore, the second lifting part is a lifting ring welded and fixed to the top of the lifting rod.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The lifting device provided in this application for hoisting prefabricated pipe sections in prefabricated vertical shafts achieves rapid positioning and stable hoisting of prefabricated pipe sections by setting a pipe body limiting frame, a sliding lifting rod, and an automatically retractable support rod assembly. This avoids manual operation in the shaft and has the advantages of improving construction safety, ensuring hoisting accuracy, and increasing construction efficiency.

[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Reference numerals: 1-Base frame; 101-Upper support ring; 102-Lower support ring; 103-Connecting rod; 2-Pipe body limiting frame; 201-Fixing frame; 2011-First lifting part; 2011a-U-shaped lifting lug; 2011b-Fixing plate; 2012-Lifting rod guide sleeve; 202-Limiting plate; 3-Lifting rod; 301-Second limiting part; 302-First limiting part; 303-Second lifting part; 304-Counterweight block; 4-Support rod assembly; 401-Guide cylinder; 402-Support rod; 402a-Annular limiting platform; 403-Reset spring; 5-Prefabricated pipe section; 501-Insertion hole. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only for illustrating the basic concept of this utility model. Unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0023] Please see Figure 1-2 This embodiment discloses a lifting device for hoisting prefabricated pipe sections 5 in assembled vertical shafts, comprising: a base frame 1, a pipe body limiting frame 2, a lifting rod 3, and a support rod assembly 4, wherein:

[0024] The base frame 1 can adopt a ring frame structure or other support structures.

[0025] The pipe body limiting frame 2 includes a fixed frame 201 fixed to the top of the base frame 1, and multiple limiting plates 202 arranged circumferentially along the prefabricated pipe section 5 and fixed on the fixed frame 201. The limiting plates 202 are conformally set to the inner wall of the prefabricated pipe section 5 and are used to fit against the inner wall of the prefabricated pipe section 5 during use. The fixed frame 201 is provided with a first lifting part 2011 for attaching lifting equipment (such as an electric hoist). The number of limiting plates 202 of the pipe body limiting frame 2 can be adjusted according to the size of the prefabricated pipe section 5, and is usually 4-8. The first lifting part 2011 can be a lifting ring, lifting lug or other standard lifting structure.

[0026] The boom 3 is vertically slidably mounted on the fixed frame 201 at the center of the precast pipe section 5. The boom 3 has a first limiting part 302 and a second limiting part 301 for restricting its upward and downward movement, respectively. The top of the boom 3 has a second lifting part 303 for attaching to lifting equipment, and the bottom of the boom 3 has a counterweight 304 fixedly mounted. The boom 3 can be made of round steel or steel pipe. The second lifting part 303 can be a lifting ring, lifting lug, or other standard lifting structure. The boom 3 is positioned on the fixed frame 201 at the center of the precast pipe section 5 to ensure it coincides with the center of gravity of the pipe section. The first limiting part 302 prevents the boom 3 from sliding upwards, and the second limiting part 301 prevents the boom 3 from sliding downwards.

[0027] The support rod assembly 4, arranged in multiple groups along the circumference of the prefabricated pipe section 5, includes: a guide cylinder 401, horizontally fixed on the base frame 1; a support rod 402, slidably sleeved within the guide cylinder 401, with its inner end abutting against the side wall of the counterweight 304, and extending outwards during the upward movement of the counterweight 304; and a return spring 403, positioned between the guide cylinder 401 and the support rod 402, providing a restoring force for the support rod 402 during the downward movement of the counterweight 304. The support rod 402 is a round rod. The return spring 403 can be a compression spring, with the spring force ensuring reliable retraction of the support rod 402. It is understandable that the height of the base frame 1 is preferably more than half the length of the prefabricated pipe section 5, so as to ensure that after the lifting equipment is installed, the positions of the first lifting part 2011 and the second lifting part 303 are above the center of gravity of the pipe section. In this way, during the lifting process, the pipe section will naturally sag under the action of gravity, ensuring the verticality of the pipe body during the process of the pipe section being lowered.

[0028] This lifting device, through the cooperation of the pipe body limiting frame 2, the lifting rod 3, and the telescopic support rod 402, can stably lift the prefabricated pipe section 5 without the need to install lifting lugs on the pipe body. After the pipe section is lifted into place, no manual unhooking operation is required, which has the advantages of improving construction safety, ensuring lifting accuracy, and increasing construction efficiency. This lifting device can be implemented according to the following principle:

[0029] First, multiple insertion holes 501 for inserting support rods 402 are pre-set along the circumferential direction on the inner wall of the prefabricated pipe section 5.

[0030] Then install the lifting device: use lifting equipment (such as an electric hoist) to hook the first lifting part 2011 and lower the lifting device into the pipe section. The lowering position should be based on the position of the support rod 402 aligned with the insertion hole 501. Understandably, at this time, due to the gravity of the counterweight 304, the lifting rod 3 falls, and the support rod 402 is in the retracted state. The lifting device can fall smoothly into the pipe section. Since the limiting block of the pipe body limiting frame 2 is in contact with the inner wall of the pipe section, it can prevent the lifting rod 3 from tilting. The first lifting part 2011 is kept unloaded, so that the lifting device is in the position where the support rod 402 is aligned with the insertion hole 501. Then, the second lifting part 303 is hooked by another lifting device (such as an electric hoist) to lift the lifting rod 3, and the support rod 402 extends outward and is inserted into the corresponding insertion hole 501. Of course, it is understandable that during the design, the insertion hole 501 should be slightly larger than the diameter of the support rod 402 to ensure that the support rod 402 can be smoothly inserted into the insertion hole 501.

[0031] Then comes the pipe section lowering and docking process: the first lifting part 2011 is unloaded (the hook of the first lifting part 2011 is not removed, and the lifting rope is kept in a slack state), and the pipe section is lowered into the pit by hooking the lifting equipment of the second lifting part 303; it can be understood that under the action of the pipe section's own weight, the support rod 402 is always in the extended state and will not be retracted, which can ensure the safety of use.

[0032] Then, the lifting device retrieval process is as follows: the rope of the lifting equipment hooked on the first lifting part 2011 is straightened, and then the second lifting part 303 is unloaded (the lifting rope hooked on the second lifting part 303 is in a slack state). Under the action of the counterweight 304, the lifting rod 3 falls, and under the action of the return spring 403, the support rod 402 is retracted. Then, the lifting device hooked on the first lifting part 2011 is pulled out.

[0033] In this embodiment, the base frame 1 includes a connecting assembly, an upper support ring 101 and a lower support ring 102 arranged coaxially with a set interval, and the connecting assembly includes a plurality of connecting rods 103 evenly distributed around the upper support ring 101, and the two ends of the connecting rods 103 are fixedly connected to the upper support ring 101 and the lower support ring 102 respectively.

[0034] Specifically, the upper support ring 101 and the lower support ring 102 are circular steel structural components, and concentricity is ensured by CNC cutting. The connecting rods 103 can be made of threaded steel, and both ends are fixed to the support rings by welding. The set spacing is determined according to the length of the prefabricated pipe section 5, and preferably the set spacing is not less than half the length of the pipe section. As a preferred embodiment, the number of connecting rods 103 is 4-8, evenly distributed along the circumference to ensure uniform stress.

[0035] Therefore, this technical solution achieves lightweighting of the lifting device through a double-ring structure design. The upper support ring 101 is used to fix the pipe body limiting frame 2, and the lower support ring 102 is used to install the support rod 402 assembly 4. The connecting rod 103 reduces the overall weight while ensuring structural strength. Compared with existing technologies, this structure can effectively distribute the load during lifting and avoid deformation problems caused by local stress concentration.

[0036] In this embodiment, the fixing frame 201 is a cross-shaped frame body and is fixed to the top of the upper support ring 101. The four ends of the cross-shaped frame body are respectively fixed with limiting plates 202. A rod guide sleeve 2012 is fixed at the center of the cross-shaped frame body, and the rod 3 is slidably inner-fitted within the rod guide sleeve 2012. The cross-shaped frame body can be fixed to the upper support ring 101 by welding or bolting. Its material is preferably Q235B steel to ensure structural strength. The connection methods between the limiting plate 202 and the cross-shaped frame body include, but are not limited to, welding, riveting, or bolting. The rod guide sleeve 2012 can be made of seamless steel pipe, with its inner wall polished to reduce the coefficient of friction. The rod guide sleeve 2012 and the cross-shaped frame body are fixedly connected by welding. As a preferred embodiment, the clearance between the rod 3 and the rod guide sleeve 2012 is controlled within the range of 0.5-1mm, ensuring smooth sliding while effectively preventing wobbling. This technical solution achieves four-point positioning through a cross-shaped frame structure, forming a stable guiding system in conjunction with the central guide sleeve. Specifically, the cross-shaped frame evenly transmits the force of the pipe body limiting frame 2 to the upper support ring 101, and the four limiting plates 202 act synchronously on the inner wall of the prefabricated pipe section 5, effectively preventing the pipe section from tilting during hoisting. The guide sleeve 2012 of the lifting rod 3 ensures that the counterweight block 304 can move in a strictly vertical direction.

[0037] In this embodiment, the first limiting part 302 is a first limiting sleeve fixed on the boom 3 below the boom guide sleeve 2012, and the second limiting part 301 is a second limiting sleeve fixed on the boom 3 above the boom guide sleeve 2012. The first and second limiting sleeves can adopt a flange-type sleeve structure and be fixed to the designated position of the boom 3 by welding. Specifically, when the first limiting sleeve contacts the lower end face of the boom guide sleeve 2012, it forms a lower stop limit; when the second limiting sleeve contacts the upper end face of the boom guide sleeve 2012, it forms an upper stop limit. This technical solution achieves precise control of the boom 3's stroke by setting the first and second limiting sleeves. Specifically, when the boom 3 rises, the contact between the first limiting sleeve and the boom guide sleeve 2012 prevents the boom 3 from moving excessively upwards, causing the support rod 402 to disengage from the counterweight 304. When the boom 3 descends, the second limiting sleeve contacts the boom guide sleeve, ensuring that the support rod 402 is fully extended and maintains a stable supporting state. Therefore, during the hoisting of the precast pipe section 5, it ensures that the support rod 402 accurately reaches the working position and avoids construction accidents caused by limiting failure.

[0038] In this embodiment, the first hoisting part 2011 includes a fixing plate 2011b and a U-shaped lifting lug 2011a fixedly connected to the fixing plate 2011b by an inverted fastening. Both ends of the fixing plate 2011b are welded and fixed to any two adjacent support rods of the cross-shaped frame. Specifically, the U-shaped lifting lug 2011a is made of round steel with a diameter of 20-30mm, and the opening width is 50-80mm. The connection between the fixing plate 2011b and the support rods of the cross-shaped frame can be achieved using continuous fillet welds. This technical solution achieves a symmetrical arrangement of the hoisting force points by welding the fixing plate 2011b to adjacent support rods of the cross-shaped frame, which helps maintain balance during the hoisting process and enhances the structural stability of the cross-shaped frame. The inverted fastening installation of the U-shaped lifting lug 2011a effectively prevents the slings from coming off during hoisting. The welding connection between the fixing plate 2011b and the cross-shaped frame has the advantages of simple structure and direct force transmission.

[0039] In this embodiment, the upper part of the counterweight 304 is a conical structure, and the lower part is a cylindrical structure, with a rounded transition at the junction of the conical and cylindrical structures. When the boom 3 is at its upper stop position (boom pulled up), the inner end of the support rod 402 abuts against the side wall of the cylindrical structure; when the boom 3 is at its lower stop position (boom lowered), the inner end of the support rod 402 abuts against the side wall of the conical structure. Specifically, the conical structure design allows the support rod 402 to slide along the inclined plane during the downward movement of the counterweight 304, thus achieving automatic retraction under the action of the return spring 403. The cylindrical structure provides a stable radial support surface for the support rod 402, ensuring it remains horizontal in its extended state. The rounded transition avoids stress concentration and improves structural reliability. In a preferred embodiment, the cone angle of the conical surface can be set to 30°-45° to balance the smoothness of sliding of the support rod 402 with the structural strength. When the hanger 3 moves upward, the support rod 402 extends horizontally along the cylindrical surface and inserts into the pipe section's insertion hole; when the hanger 3 moves downward, the support rod 402 slides and retracts along the conical surface.

[0040] In this embodiment, the inner end of the support rod 402 is a ball-head structure. Specifically, the ball-head structure refers to the end of the support rod 402 that contacts the counterweight 304 being machined into a spherical curved surface. Therefore, this technical solution, by setting the contact end of the support rod 402 as a ball-head structure, allows the ball-head structure to slide along the conical surface of the counterweight 304 when the lifting rod 3 moves the counterweight 304 upward, effectively reducing sliding friction resistance; and when the support rod 402 is fully extended, the ball-head structure can adaptively adjust its angle to fit the pipe section insertion hole 501, avoiding localized stress concentration.

[0041] In this embodiment, the support rod assembly 4 consists of four groups, evenly distributed along the circumference of the lower support ring 102; the guide cylinder 401 is arranged radially along the lower support ring 102 and welded to it. Specifically, the number of support rod assemblies 4 is set to four groups, which ensures a uniformly distributed support force during the hoisting of the prefabricated pipe section 5, thereby improving the stability of the hoisting. The guide cylinder 401 is arranged radially along the lower support ring 102 and fixed to it by welding. This arrangement ensures the linear movement of the support rod 402 during extension and retraction, avoiding jamming or displacement caused by uneven force. The return spring 403 is sleeved inside the guide cylinder 401 and connected to the support rod 402 through the annular limiting platform 402a. This structural design provides sufficient return force when the counterweight 304 moves downward, ensuring that the support rod 402 can be quickly and accurately retracted. Therefore, this technical solution effectively solves the problems of uneven distribution of support force and difficulty in repositioning during the hoisting of prefabricated pipe sections 5 by optimizing the arrangement and structural design of the support rod assembly 4. Compared with existing technologies, this solution not only improves the stability and safety of hoisting but also simplifies the operation process and reduces the need for manual intervention, thereby significantly improving construction efficiency and operational safety.

[0042] In this embodiment, the return spring 403 is inner-sleeved within the guide cylinder 401, and the support rod 402 is provided with an annular limiting platform 402a. One end of the return spring 403 abuts against the guide cylinder 401, and the other end of the return spring 403 abuts against the annular limiting platform 402a. Specifically, the return spring 403 adopts a helical compression spring structure, and its outer diameter is clearance-fitted with the inner wall of the guide cylinder 401 to ensure that the spring does not deviate radially when compressed. The annular limiting platform 402a is machined and is integrally formed with the support rod 402. The width of the platform surface must be greater than the spring wire diameter to prevent the spring from embedding. The free length of the return spring 403 can be calculated and determined based on the stroke of the counterweight 304. In this technical solution, the double limiting structure formed by the annular limiting platform 402a and the guide cylinder 401 ensures the axial stability of the spring during operation and avoids mechanical interference caused by excessive retraction of the support rod 402.

[0043] In this embodiment, the second lifting part 303 is a lifting ring welded and fixed to the top of the lifting rod 3. Specifically, the lifting ring adopts a standard lifting ring and is rigidly connected to the top of the lifting rod 3 by full welding. Therefore, the lifting ring structure is simple and reliable, facilitating quick connection with various lifting equipment. This technical solution achieves efficient docking between the lifting device and the lifting equipment through a standardized lifting ring design. The welding fixing method ensures the connection strength.

[0044] Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A lifting tool for hoisting prefabricated pipe sections in assembled vertical shafts, characterized in that, include: Base frame; The pipe body limiting frame includes a fixed frame fixed to the top of the base frame, and multiple limiting plates arranged circumferentially along the precast pipe section and fixed on the fixed frame. The limiting plates are conformally set to the inner wall of the precast pipe section and are used to fit against the inner wall of the precast pipe section during use. The fixed frame is provided with a first lifting part for hanging lifting equipment. The boom is vertically slidably mounted on the fixed frame at the center of the precast pipe section. The boom is provided with a first limiting part and a second limiting part for limiting the upward and downward movement of the boom, respectively. The top of the boom is provided with a second lifting part for attaching lifting equipment, and the bottom of the boom is fixed with a counterweight. Support rod assemblies, wherein multiple sets of support rod assemblies are arranged circumferentially along the precast pipe section, and the support rod assemblies include: The guide tube is horizontally fixed on the base frame; The support rod has a sliding inner sleeve set in the guide cylinder, and the inner end of the support rod is attached to the side wall of the counterweight block. It can extend outward during the upward movement of the counterweight block. In use, after the support rod extends outward, it is used to insert into the pre-set insertion hole on the prefabricated pipe section. A return spring, located between the guide cylinder and the support rod, is used to provide a restoring force for the support rod during the downward movement of the counterweight.

2. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 1, characterized in that: The base frame includes a connecting assembly, an upper support ring and a lower support ring arranged coaxially at a set interval, and the connecting assembly includes multiple connecting rods evenly distributed along the circumference of the upper support ring, with the two ends of the connecting rods fixedly connected to the upper support ring and the lower support ring respectively.

3. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 2, characterized in that: The fixing frame is a cross-shaped frame body and is fixed to the top of the upper support ring. The limiting plates are fixed to the four ends of the cross-shaped frame body respectively. A guide sleeve for the suspension rod is fixed at the center of the cross-shaped frame, and the sliding inner sleeve of the suspension rod is disposed in the guide sleeve for the suspension rod.

4. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 3, characterized in that: The first limiting part is a first limiting sleeve fixed on the boom and located below the boom guide sleeve, and the second limiting part is a second limiting sleeve fixed on the boom and located above the boom guide sleeve.

5. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 3, characterized in that: The first hoisting part includes a fixed plate and U-shaped lifting lugs that are fixedly connected to the fixed plate. The two ends of the fixed plate are respectively welded and fixed to any two adjacent support rods of the cross-shaped frame.

6. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 2, characterized in that: The upper part of the counterweight is a conical structure, and the lower part of the counterweight is a cylindrical structure, with rounded corners at the transition between the conical and cylindrical structures. Furthermore, when the boom is at the upper stop position, the inner end of the support rod abuts against the side wall of the cylindrical structure, and when the boom is at the lower stop position, the inner end of the support rod abuts against the side wall of the conical structure.

7. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 6, characterized in that: The inner end of the support rod has a ball-head structure.

8. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 2, characterized in that: The support rod assembly consists of four groups, which are evenly distributed along the circumference of the lower support ring; The guide cylinder is arranged radially along the lower support ring and welded and fixed to the lower support ring.

9. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 8, characterized in that: The reset spring is inner sleeved in the guide cylinder, and the support rod is provided with an annular limiting platform. One end of the reset spring abuts against the guide cylinder, and the other end of the reset spring abuts against the annular limiting platform.

10. The lifting device for hoisting prefabricated pipe sections in assembled vertical shafts according to claim 1, characterized in that: The second lifting part is a lifting ring welded and fixed to the top of the lifting rod.

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