A steel cage hoisting device for prestressed reinforced concrete pipes

Abstract

This invention relates to the field of hoisting equipment, and more particularly to a hoisting device for the reinforcing cage of a prestressed reinforced concrete pipe, comprising a cross steel frame, hoisting ropes, and hoisting rings; the cross steel frame is connected to several hoisting ropes; all hoisting ropes are connected to a hoisting ring. This invention first hoists the reinforcing cage into the outer mold, and then hoists the two together to the inner column, thereby completing the hoisting and assembly of the outer mold, inner column, and reinforcing cage. Compared with existing technologies, this method effectively avoids the problem of the heavy mold damaging the reinforcing cage due to misalignment between the outer mold and the reinforcing cage. It also solves the problem of difficulty in adjusting the position of the reinforcing cage after it has entered the mold. By changing the hoisting sequence, this invention avoids the risk of damaging the reinforcing cage due to misalignment and facilitates adjusting the position of the reinforcing cage within the mold. Finally, the outer mold and reinforcing cage can be hoisted together to the inner column. The entire process is quick and the placement is neat.

Description

Technical Field

[0001] This invention relates to the field of hoisting equipment, and more particularly to a hoisting device for the reinforcing cage of a prestressed reinforced concrete pipe. Background Technology

[0002] Prestressed concrete pipes are circular pressure pipes made by placing a reinforcing cage inside the pipe wall during casting. The reinforcing cage applies circumferential prestress to the concrete during the casting process. The existing concrete pipe manufacturing process is as follows: the reinforcing cage is hoisted onto the base plate of the outer mold, the outer mold is then placed on the reinforcing cage, the base plate and the outer mold are fixed, and then the outer mold and the reinforcing cage are hoisted onto the cylindrical inner mold. The inner mold passes through the middle of the base plate into the outer mold and the reinforcing cage, so that the reinforcing cage is confined within the annular space between the outer mold and the inner mold. Concrete is then poured into this space to bury the reinforcing cage and form a concrete pipe.

[0003] In the current operation, directly placing the outer mold onto the reinforcing cage has defects: if the two are not aligned, the excessively heavy mold can easily crush the reinforcing cage when it moves down. In addition, if the reinforcing cage becomes eccentric after being placed into the mold, it is difficult to adjust. An eccentric reinforcing cage will cause the concrete wall of the pipe to be thicker on one side and thinner on the other side, which will result in uneven stress on the finished concrete pipe and affect its load-bearing capacity. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, such as the damage to the steel cage caused by the misalignment between the outer mold and the steel cage when the outer mold is lowered, the present invention provides a steel cage hoisting device for prestressed reinforced concrete pipes.

[0005] The technical solution of this invention is: a hoisting device for the reinforcing cage of a prestressed reinforced concrete pipe, comprising a cross steel frame; a steel hook fixed to the top of the cross steel frame; further comprising hoisting ropes, a lifting ring, a hook, a lifting assembly, and a laser positioning assembly; the cross steel frame is connected to several hoisting ropes; all hoisting ropes are connected to a lifting ring; several lifting rods are rotatably connected to the lifting ring; a sliding ring is slidably connected to the lifting ring; flanges for limiting the sliding ring are provided at the top and bottom of the outer circumference of the lifting ring; several pull ropes are connected to the sliding ring; a lifting assembly for pulling the pull ropes is installed on the cross steel frame; a hook for hoisting the outer mold is installed on the cross steel frame; and a laser positioning assembly for positioning the outer mold and the reinforcing cage is connected to the cross steel frame.

[0006] Optionally, the lifting assembly includes: a motor and a take-up roller; several motors are mounted on a cross steel frame; the output shaft of each motor is fixedly connected to a take-up roller; each pull rope is wound around a take-up roller.

[0007] Optionally, the laser positioning assembly includes: an electric push rod, a positioning rod, and a laser light; a cross-shaped steel frame connects several electric push rods; each electric push rod has a positioning rod fixed to its telescopic end for determining the outer diameter of the reinforcing cage; and each positioning rod has a laser light for positioning the reinforcing cage installed at its bottom.

[0008] Optionally, it also includes an arc-shaped diffuser plate; each positioning rod has a diffuser plate installed at its bottom to change the shape of the laser beam.

[0009] Optionally, it also includes guide rods, movable plates, elastic elements, and fixed pulley blocks; a cross steel frame is fixedly connected to several guide rods; each guide rod is slidably connected to a movable plate; an elastic element connects the movable plate to the guide rod; each electric push rod is mounted on a corresponding movable plate; each movable plate is equipped with a fixed pulley block that drives the lifting rope to move; each lifting rope passes through the corresponding fixed pulley block.

[0010] Optionally, the inner bottom edge of the ring can be angled.

[0011] Optionally, it also includes ball wheels; each positioning rod is equipped with several ball wheels to reduce friction.

[0012] Alternatively, the hoisting rope passes through the cross-shaped steel frame.

[0013] Optionally, the hook is designed to prevent detachment.

[0014] Optionally, it also includes a second motor and a second take-up roller; several second motors are mounted on the cross steel frame; each output shaft of the second motor is fixedly connected to a second take-up roller; each suspension rope is wound around a second take-up roller.

[0015] The beneficial effects are as follows: This invention first hoists the reinforcing cage into the outer mold, and then hoists the two together to the inner column, thereby completing the hoisting and assembly of the outer mold, inner column and reinforcing cage; compared with the prior art, this method can effectively avoid the problem of the heavy mold crushing the reinforcing cage due to misalignment between the outer mold and the reinforcing cage. At the same time, it also solves the problem of the inconvenience of adjusting the position of the reinforcing cage after it is put into the mold. By changing the hoisting sequence, this invention avoids the risk of crushing the reinforcing cage due to misalignment, and also facilitates the adjustment of the position of the reinforcing cage in the mold. Finally, the outer mold and the reinforcing cage can be hoisted together to the inner column. The whole process is quick and the placement is neat. By adapting the positioning rod to the outer diameter of the rebar cage and using a laser light to project the outer diameter outline of the rebar cage, a visual reference is provided for the alignment and placement of the outer mold, which facilitates the quick alignment and positioning of the rebar cage with the outer mold and ensures that the rebar cage can be smoothly lowered into the outer mold. Multiple positioning rods are used to press against the inner wall of the outer mold as a reference, which in turn moves the lifting rope, lifting ring and steel cage. Finally, the steel cage is accurately positioned concentric with the outer mold and then placed into the outer mold. This avoids the steel cage being eccentric with the outer mold. If one side of the steel cage is closer to the inner wall of the outer mold, the subsequent pouring of concrete will result in uneven support strength of the steel cage on the concrete. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the hoisting of the outer mold and the reinforcing cage according to the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the steel cage hoisting device for the prestressed reinforced concrete pipe of the present invention; Figure 3 This is an exploded view of the outer mold, base plate, inner column, outer mold, and reinforcing cage of the present invention; Figure 4 This is a three-dimensional structural diagram of the lifting rod of the present invention in a vertical state; Figure 5 This is a three-dimensional structural diagram of the lifting rope, lifting ring, guide rod, electric push rod, and positioning rod of the present invention; Figure 6 This is a front view of the lifting rope, lifting ring, guide rod, electric push rod, and positioning rod of the present invention.

[0017] Among them: 1-cross steel frame, 2-lifting rope, 3-lifting ring, 31-motor one, 32-winding roller one, 301-lifting rod, 302-slip ring, 303-pull rope, 4-hook, 5-guide rod, 501-moving plate, 502-elastic element, 6-electric push rod, 7-positioning rod, 701-laser light, 702-diffuser plate, 703-ball wheel, 8-fixed pulley block, 91-motor two, 92-winding roller two, 1111-outer mold, 1112-base plate, 1113-inner column, 2222-reinforcing cage. Detailed Implementation

[0018] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, lateral, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0019] Example 1: As Figures 1-6 As shown, a steel cage hoisting device for a prestressed reinforced concrete pipe includes a cross steel frame 1; a steel lifting buckle is bolted to the top of the cross steel frame 1. It also includes lifting ropes 2, lifting rings 3, hooks 4, lifting components, and laser positioning components; the cross steel frame 1 is connected to four lifting ropes 2; all lifting ropes 2 are connected to lifting rings 3 via hooks; four lifting rods 301 are rotatably connected to the lifting rings 3 via torsion springs; slip rings 302 are slidably connected to the lifting rings 3; flanges are provided at the top and bottom of the outer circumference of the lifting rings 3; four pull ropes 303 are connected to the slip rings 302; the lifting components are installed on the cross steel frame 1; all pull ropes 303 are wound around the lifting components; hooks 4 are connected to the lower side of each side of the cross steel frame 1 via iron chains; laser positioning components are connected to the lower side of each side of the cross steel frame 1.

[0020] The lifting assembly includes: a motor 31 and a take-up roller 32; four motors 31 are mounted on the cross steel frame 1; each motor 31 output shaft is fixed to a take-up roller 32; each pull rope 303 is wound around a take-up roller 32, the motor 31 drives the take-up roller 32 to wind and unwind the pull rope 303, causing the slip ring 302 to move up and down relative to the lifting ring 3, thereby changing the posture of the lifting rod 301.

[0021] The laser positioning assembly includes: an electric push rod 6, a positioning rod 7, and a laser light 701; an electric push rod 6 is connected to the lower side of each side of the cross steel frame 1; a downwardly extending positioning rod 7 is fixed to the telescopic end of each electric push rod 6; a laser light 701 is installed at the bottom of each positioning rod 7.

[0022] It also includes a diffuser plate 702; a diffuser plate 702 is installed at the bottom of each positioning rod 7; the diffuser plate 702 is arc-shaped, so that the light from the laser lamp 701 shines downward in an arc.

[0023] It also includes guide rods 5, movable plates 501, elastic elements 502, and fixed pulley groups 8; each side of the cross steel frame 1 is fixedly connected to a guide rod 5; each guide rod 5 is slidably connected to a movable plate 501; an elastic element 502 is connected between the movable plate 501 and the guide rod 5; the elastic element 502 is a tension spring; each electric push rod 6 is installed on the corresponding movable plate 501; each movable plate 501 is equipped with a fixed pulley group 8; each hoisting rope 2 passes through the corresponding fixed pulley group 8.

[0024] The inner bottom edge of the lifting ring 3 is set at an angle to facilitate the fitting of the lifting ring 3 onto the inner column 1113.

[0025] It also includes ball wheels 703; each positioning rod 7 has three ball wheels 703 installed in a vertical arrangement.

[0026] The hoisting rope 2 passes through the cross steel frame 1 to reduce the swing amplitude of the hoisting rope 2 during hoisting and movement, thereby improving stability.

[0027] Hook 4 is designed to prevent detachment and enhance the stability of the connection during lifting.

[0028] The hoisting steps of this invention are as follows: Before hoisting the reinforcing cage 2222, first connect the crane to the steel hooks of the cross steel frame 1, then hoist the cross steel frame 1 above the outer mold 1111. Next, hook each of the hooks 4 onto the outer mold 1111, then hoist the outer mold 1111 onto the base plate 1112, and lock the bottom of the outer mold 1111 to the base plate 1112. Assemble the outer mold 1111 and base plate 1112 into place. Then, release the hooks 4 from the outer mold 1111, and control the crane to move the cross steel frame 1 and lifting rings 3 above the reinforcing cage 2222, aligning the lifting rings 3 with the reinforcing cage 2222. Inside, the control motor 31 drives the take-up roller 32 to release the pull rope 303. The slip ring 302 slides downward relative to the lifting ring 3, releasing the restriction on the lifting rod 301. The torsion spring between the lifting rod 301 and the lifting ring 3 is released, causing the lifting rod 301 to flip from a vertical state to a horizontal state. Then, the control crane lowers the cross steel frame 1, causing the lifting ring 3 to move downward into the rebar cage 2222. When the lifting ring 3 enters the rebar cage 2222, the horizontally positioned lifting rod 301 touches the rebar cage 2222, is lifted upward, flipped, and the corresponding torsion spring is compressed, and the rebar cage is moved into the horizontal position. The lifting ring 3 can be smoothly lowered into the rebar cage 2222. When the top of the lifting rod 301 passes the topmost rebar ring of the rebar cage 2222, the torsion spring will drive the lifting rod 301 to flip downwards again, so that the lifting rod 301 is finally stuck between the top rebar ring and the second rebar ring. At this time, the crane is controlled to lift the cross steel frame 1 and the lifting ring 3. The lifting ring 3 moves upward, and the lifting rod 301 will abut against the top rebar ring. Then, when the lifting ring 3 moves upward, it will lift the entire rebar cage 2222 through the lifting rod 301. After that, the crane is controlled to lift the cross steel frame 1, the lifting ring 3, and the rebar cage 2222 to the outer mold 111. Above 1, align the steel cage 2222 with the outer mold 1111, and then lower the steel cage 2222 into the outer mold 1111; then hook the hook 4 with the outer mold 1111, and use a crane to lift the invention, the outer mold 1111 and the steel cage 2222 together, move them above the inner column 1113, and then lower the outer mold 1111 and the steel cage 2222. The inner column 1113 will pass through the hole in the bottom plate 1112 into the outer mold 1111 and the steel cage 2222, completing the hoisting and assembly of the outer mold 1111, the inner column 1113 and the steel cage 2222;First, the crane moves the lifting ring 3 downwards, causing the lifting rod 301 to contact the second layer of reinforcing bars and be lifted and flipped. The top of the lifting rod 301 does not contact the first layer of reinforcing bars. Then, the control motor 31 drives the winding roller 32 to wind up the pull rope 303. The pull rope 303 pulls the slip ring 302 upwards relative to the lifting ring 3, which in turn lifts the lifting rod 301 upwards. The lifting rod 301 compresses the torsion spring and flips back to a vertical position, no longer contacting the reinforcing cage 2222. Then, the connection between the hook 4 and the outer mold 1111 is released. The crane moves the cross steel frame 1 and the lifting ring 3 upwards, allowing the lifting ring 3 to be easily removed from the reinforcing cage 2222, thus detaching the invention from the reinforcing cage 2222. Finally, concrete is poured between the outer mold 1111 and the inner column 1113 to bury the reinforcing cage 2222, forming a concrete pipe.

[0029] Before the lifting ring 3 lifts the rebar cage 2222 and transports it into the outer mold 1111, the bottom of the positioning rod 7 is lower than the top of the rebar cage 2222. The electric push rod 6 is controlled to retract, causing the positioning rod 7 to rest against the outside of the rebar cage 2222. At this time, the diameter of the circle formed by the positioning rods 7 is approximately the outer diameter of the rebar cage 2222. The laser light 701 at the bottom of the positioning rod 7 shines downward, projecting the size of the outer diameter of the rebar cage 2222 below. Then, the rebar cage 2222 is lifted above the outer mold 1111. If the rebar cage 2222 is not aligned with the outer mold 1111, the light from the laser light 701 will shine on the upper edge of the outer mold 1111. In this case, the position of the rebar cage 2222 is adjusted by moving the crane until the light from the laser light 701 shines only on the inside of the outer mold 1111. This indicates that the rebar cage 2222 is aligned with the inside of the outer mold 1111. When the rebar cage 2222 is lowered, it will not collide with the outer mold 1111 and can be smoothly placed into the outer mold 1111.

[0030] After the reinforcing cage 2222 is placed into the outer mold 1111, because the outer diameter of the reinforcing cage 2222 is smaller than the inner diameter of the outer mold 1111, the reinforcing cage 2222 inevitably becomes eccentric with the outer mold 1111 after entering. One side of the reinforcing cage 2222 is closer to the inner wall of the outer mold 1111. This will cause uneven support strength of the reinforcing cage 2222 on the concrete during subsequent concrete pouring. Consequently, after the reinforcing cage 2222 is placed into the outer mold 1111, the bottom of the reinforcing cage 2222 should not contact the base plate 1112, and the reinforcing cage 2222 should still be in a suspended state. At this time, if... Figure 6As shown, the bottom of the positioning rod 7 enters the outer mold 1111. Then, all electric push rods 6 are controlled to extend synchronously. The positioning rod 7 closer to the outer mold 1111 will be pushed against its inner wall by the ball wheel 703, which in turn pushes the electric push rod 6. The electric push rod 6 pushes the moving plate 501 along the guide rod 5 and stretches the elastic element 502. The moving plate 501 drives the fixed pulley group 8 to move towards the center of the outer mold 1111. The fixed pulley group 8 pushes the corresponding lifting rope 2, causing the lifting rope 2 to move the lifting ring 3 and the reinforcing cage 2222, adjusting the position of the reinforcing cage 2222 until all electric push rods 6 extend and all positioning rods 7 contact the inner wall of the outer mold 1111. The reinforcing cage 2222 is then adjusted. Positioned concentrically with the outer mold 1111, the cross steel frame 1 and lifting ring 3 are then lowered by a crane to completely lower the reinforcing cage 2222 onto the base plate 1112. During this process, the positioning rod 7 moves downward close to the inner wall of the cross steel frame 1 with the help of the ball wheel 703, limiting the distance between the reinforcing cage 2222 and the inner wall of the outer mold 1111 to remain the same, ensuring the quality of the subsequent concrete pouring. Furthermore, when the outer mold 1111 and the reinforcing cage 2222 are hoisted onto the inner column 1113, the positioning rod 7 remains pressed against the inner wall of the outer mold 1111, limiting the position between the outer mold 1111 and the reinforcing cage 2222 to prevent the outer mold 1111 and the reinforcing cage 2222 from tilting or misaligning during hoisting.

[0031] Based on the above steps, we can see that the present invention has the following effects: First, the present invention lifts the reinforcing cage 2222 and places it into the outer mold 1111. Then, the outer mold 1111 and the reinforcing cage 2222 are hoisted together onto the inner column 1113, completing the hoisting and assembly of the outer mold 1111, the inner column 1113, and the reinforcing cage 2222. Compared to the existing method of fitting the outer mold 1111 onto the reinforcing cage 2222, where the outer mold 1111 and the reinforcing cage 2222 are not aligned, the excessively heavy outer mold 1111 is prone to crushing the reinforcing cage 2222, and the reinforcing cage 2222 is difficult to adjust after being fitted into the outer mold 1111, the present invention avoids the misaligned outer mold 1111 crushing the reinforcing cage 2222 by changing the hoisting sequence. At the same time, it also facilitates the adjustment of the position between the reinforcing cage 2222 and the outer mold 1111, and subsequently, the outer mold 1111 and the reinforcing cage 2222 can be hoisted together onto the inner column 1113. The operation is quick and the placement is neat.

[0032] The positioning rod 7 is adapted to the outer diameter of the rebar cage 2222. The laser light 701 projects the size of the outer diameter of the rebar cage 2222 and the position of the outer mold 1111 for alignment reference. This facilitates the quick alignment and positioning of the rebar cage 2222 and the outer mold 1111, preventing the rebar cage 2222 from failing to fit into the outer mold 1111 when it is lowered.

[0033] Multiple positioning rods 7 are used to press against the inner wall of the outer mold 1111, thereby moving the lifting rope 2, lifting ring 3 and reinforcing cage 2222. The reinforcing cage 2222 is accurately positioned concentrically with the outer mold 1111, and then the reinforcing cage 2222 is placed into the outer mold 1111. This prevents the reinforcing cage 2222 from being eccentric with the outer mold 1111. If one side of the reinforcing cage 2222 is closer to the inner wall of the outer mold 1111, the subsequent pouring of concrete will result in uneven support strength of the reinforcing cage 2222 on the concrete.

[0034] Example 2: Based on Example 1, as follows Figure 2 , Figure 5 ,and Figure 6 As shown, it also includes a second motor 91 and a second take-up roller 92; four second motors 91 are installed on the cross steel frame 1; each second motor 91 output shaft is fixedly connected to a second take-up roller 92; each lifting rope 2 is wound on a second take-up roller 92; the second take-up roller 92 rotates to wind up and unwind the lifting rope 2 to adjust the length of the lifting rope 2.

[0035] The operation steps for using this embodiment are as follows: Typically, the welded steel cage 2222 at the construction site is horizontal. However, due to its large size and weight, it is inconvenient to lift it vertically and place it into the outer mold 1111. In this case, the present invention can directly hoist the horizontally positioned steel cage 2222. First, a crane is used to lift the cross steel frame 1 to the vicinity of the steel cage 2222. Then, motor 2 91 drives the winding roller 2 92 to release the hoisting rope 2 (motor 1 31 synchronously drives the winding roller 1 32 to release the pull rope 303, allowing the slip ring 302 to move freely). The lifting rod 301 is not restricted during the movement, and the lifting ring 3 will move away from the cross steel frame 1. Because the lifting rope 2 is released to a sufficient length, the range of motion of the lifting ring 3 increases. The worker then adjusts the lifting ring 3 to a horizontal position concentric with the rebar cage 2222, and moves the lifting ring 3 from one side of the rebar cage 2222 into its interior. At this time, the lifting rod 301 is not restricted by the slip ring 302 and is in a rotatable state. When the lifting ring 3 enters the rebar cage 2222, the direction of the lifting rod 301 is perpendicular to the axis of the lifting ring 3, and it will touch... The reinforcing cage 2222 is tilted and rotated into a retracted state aligned with the axis of the lifting ring 3, allowing the lifting ring 3 to smoothly enter the reinforcing cage 2222. Once inside, the lifting ring 3 is positioned to one side of the cage. When the lifting rod 301 moves between the reinforcing rings of the cage 2222, the torsion spring releases, causing the lifting rod 301 to rotate perpendicular to the axis of the lifting ring 3, allowing it to fit through the gap in the reinforcing cage 2222. The lifting ring 3 is then secured by the lifting rod 301. Hold the reinforcing cage 2222, then control the crane to lift the cross steel frame 1, and at the same time control the motor 2 91 to drive the winding roller 2 92 to wind up the lifting rope 2, so that the lifting ring 3 moves the reinforcing cage 2222 closer to the cross steel frame 1, and the lifting ring 3 is locked with one side of the horizontally lying reinforcing cage 2222. The reinforcing cage 2222 is lifted by the lifting ring 3 and changes from horizontal to vertical. Then, the crane moves the present invention and the reinforcing cage 2222 together and puts the reinforcing cage 2222 into the outer mold 1111.

[0036] Based on the above steps, we can see that the present invention also has the following effects: When dealing with a horizontally positioned rebar cage 2222, this invention increases the range of motion of the lifting ring 3 by releasing the lifting rope 2, allowing it to change its posture and enter the rebar cage 2222, where it is engaged. The rebar cage 2222 is then lifted, with the lifting ring 3 engaged on one side, causing one side of the rebar cage 2222 to be lifted first, thus changing it from a horizontal to a vertical position. Afterward, the rebar cage 2222 can be directly transported to the outer mold 1111. Compared to existing methods for lifting large horizontally positioned rebar cages 2222, which require using specialized lifting equipment to hold both ends of the cage, changing the posture by varying the rope lengths at both ends, and then disassembling the ropes on the bottom side before placing the cage into the outer mold 1111, this invention achieves the posture change and placement of the rebar cage 2222 into the outer mold 1111 in one continuous process, significantly improving efficiency.

[0037] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A hoisting device for a reinforcing cage of a prestressed reinforced concrete pipe, comprising a cross steel frame (1); a steel lifting buckle is fixedly connected to the top of the cross steel frame (1); characterized in that: It also includes a lifting rope (2), a lifting ring (3), a hook (4), a lifting assembly and a laser positioning assembly; several lifting ropes (2) are connected to the cross steel frame (1); all the lifting ropes (2) are connected to the lifting ring (3); several lifting rods (301) are rotatably connected to the lifting ring (3); a slip ring (302) is fitted on the lifting ring (3) and slidably connected, and the top and bottom of the outer circumference of the lifting ring (3) are provided with flanges for limiting the slip ring (302); several pull ropes (303) are connected to the slip ring (302); a lifting assembly for raising and lowering the pull ropes (303) is installed on the cross steel frame (1); a hook (4) for lifting the outer mold (1111) is installed on the cross steel frame (1); a laser positioning assembly for positioning the outer mold (1111) and the steel cage (2222) is connected to the cross steel frame (1).

2. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 1, characterized in that: The lifting assembly includes: a motor (31) and a take-up roller (32); several motors (31) are mounted on the cross steel frame (1); the output shaft of each motor (31) is fixed to a take-up roller (32); each pull rope (303) is wound around a take-up roller (32).

3. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 1, characterized in that: The laser positioning assembly includes: an electric push rod (6), a positioning rod (7), and a laser light (701); a cross steel frame (1) is connected to several electric push rods (6); each electric push rod (6) has a positioning rod (7) fixed to its telescopic end for determining the outer diameter of the steel cage (2222); each positioning rod (7) has a laser light (701) installed at its bottom for positioning the steel cage (2222).

4. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 3, characterized in that: It also includes an arc-shaped diffuser plate (702); each positioning rod (7) has a diffuser plate (702) installed at the bottom to change the irradiation shape of the laser lamp (701).

5. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 4, characterized in that: It also includes guide rods (5), movable plates (501), elastic elements (502) and fixed pulley groups (8); a cross steel frame (1) is fixedly connected to several guide rods (5); each guide rod (5) is slidably connected to a movable plate (501); an elastic element (502) is connected between the movable plate (501) and the guide rod (5); each electric push rod (6) is installed on the corresponding movable plate (501); each movable plate (501) is equipped with a fixed pulley group (8) that drives the hoisting rope (2) to move; each hoisting rope (2) passes around the corresponding fixed pulley group (8).

6. A rebar cage hoisting device for a prestressed reinforced concrete pipe according to any one of claims 1-5, characterized in that: The inner bottom edge of the hanging ring (3) is set at an angle.

7. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 3, characterized in that: It also includes ball wheels (703); each positioning rod (7) is equipped with several ball wheels (703) to reduce friction.

8. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 5, characterized in that: The suspension rope (2) is threaded through the cross steel frame (1).

9. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 8, characterized in that: The hook (4) is designed to prevent it from coming off.

10. The steel cage hoisting device for a prestressed reinforced concrete pipe according to claim 9, characterized in that: It also includes a second motor (91) and a second take-up roller (92); several second motors (91) are mounted on the cross steel frame (1); each output shaft of the second motor (91) is fixed to a second take-up roller (92); each rope (2) is wound around a second take-up roller (92).

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