Auxiliary hoisting device for underground laid large-diameter cement pipe and operation method of auxiliary hoisting device

Abstract

The invention belongs to the technical field of large-diameter cement pipe hoisting, and particularly relates to an underground laid large-diameter cement pipe hoisting auxiliary device and an operation method thereof.The underground laid large-diameter cement pipe hoisting auxiliary device is characterized in that the underground laid large-diameter cement pipe hoisting auxiliary device comprises a hoisting tool, a hoisting lug, a buffering cushion and a balance weight mechanism, and the hoisting tool is of an unequal-height U-shaped structure and comprises a long edge, a short edge and a connecting edge connecting the long edge and the short edge; the outer end of the long edge is connected with a counterweight mechanism, a plurality of lifting lugs are arranged on the outer side of the long edge side by side, a buffer cushion is arranged on the short edge, the length of the short edge is not smaller than that of a lifted pipe section, during lifting, the lifting appliance is in a horizontal state, an opening faces one side, and the buffer cushion is supported on the inner wall of a cement pipe; and the lifting lug is connected with a crane hook head. The device has the beneficial effects that two cement pipe sections can be directly butted in place at the ditch bottom by utilizing the device, and after the pipe sections are mounted and butted, the device can be conveniently withdrawn from a pipe orifice on the other side, so that the damage to the large-diameter cement pipe in the hoisting process is effectively prevented; and potential safety and quality hazards are eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of large-diameter cement pipe hoisting, and in particular relates to an auxiliary device for hoisting underground large-diameter cement pipes and an operating method thereof. Background Art

[0002] Large-diameter cement pipes typically range in diameter from 500mm to 3000mm and in length from 2m to 2.5m. They are typically laid directly underground. Large-diameter cement pipes have two main connection methods: socket and spigot connection and tongue-and-groove connection. Installation and connection within the trench requires a crane to lift the pipe. Conventional lifting operations typically involve two methods. One method uses the pipe ends on either side of the pipe section as lifting points. This method, limited by the lifting equipment at the pipe end connection, cannot be directly connected using a crane. This requires significant manpower and equipment for secondary adjustments, which is time-consuming and labor-intensive, and poses significant safety risks. The other method involves a bottom-to-bottom bundling method. While this method allows for direct connection of the two pipe sections using a crane, bundling large-diameter cement pipes is complex. Furthermore, since the pipes sit directly at the bottom of the trench, it is difficult to remove the steel rope buckles trapped underneath the pipes after installation, which is also time-consuming and labor-intensive. Both of these lifting methods can damage the cement pipes to varying degrees. Summary of the Invention

[0003] The purpose of the present invention is to provide an auxiliary device for lifting underground large-diameter cement pipes and an operating method thereof, which overcomes the shortcomings of the existing technology. By using the auxiliary device for lifting, the cement pipe section is inserted into the cement pipe section from the pipe opening on one side of the cement pipe section, and the cement pipe section is directly lifted. The device can be used to directly connect the two pipe sections into place at the bottom of the trench. After the pipe sections are installed and connected, the device can be conveniently withdrawn from the pipe opening on the other side, which is safe and efficient, and can also ensure that the cement pipe section is not damaged.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] One of the technical solutions: An auxiliary device for lifting large-diameter cement pipes laid underground, including a lifting device, a lifting lug, a buffer pad and a counterweight mechanism. The lifting device is a U-shaped structure of unequal height, including a long side, a short side and a connecting side connecting the long side and the short side. The outer end of the long side is connected to the counterweight mechanism, and multiple lifting lugs are arranged side by side on the outer side of the long side. A buffer pad is provided on the short side. The length of the short side is not less than the length of the pipe section to be lifted. During lifting, the lifting device is in a horizontal state with the opening facing one side, and the buffer pad supports the inner wall of the cement pipe; the lifting lug is connected to the crane hook head through a wire rope and a clamp.

[0006] Furthermore, the buffer pad is an annular rubber structure, fixedly connected to the short side, and the number is 2-3.

[0007] Furthermore, the buffer pad is made of a modified rubber tire, and both sides of the buffer pad are connected to the short sides by pins for limiting.

[0008] Furthermore, the large-diameter cement pipe is a socket-and-spigot type or a tongue-and-groove type cement pipe with a diameter specification of 500mm-3000mm.

[0009] Furthermore, the counterweight mechanism includes an externally threaded rod and a counterweight nut, the counterweight nut is matched and connected to the externally threaded rod, and an operating handle is provided on the outer periphery of the counterweight nut.

[0010] The thread length of the external threaded rod is 100-300 mm, and the weight of the counterweight nut is 2-20 kg.

[0011] Technical Solution 2: An operating method for an auxiliary device for lifting underground large-diameter cement pipes, including setting the center of gravity, trial lifting the counterweight, lifting the pipe body, and removing the lifting device. The specific operating steps are as follows:

[0012] 1) Assign the center of gravity and determine the appropriate lifting lugs according to the center of gravity of the pipe to be lifted on the short side of the sling, ensuring that the lifting lugs and the center of gravity of the pipe to be lifted are on the same plumb line;

[0013] 2) Test hoisting of the counterweight: the crane performs a no-load test hoist on the spreader, and the position of the counterweight nut on the external threaded rod is adjusted by the operating handle to ensure that the spreader can maintain a horizontal state under no-load conditions;

[0014] 3) Hoisting the pipe body: insert the short side of the lifting tool into the free end of the pipe section to be hoisted, start the crane to lift the pipe section to be hoisted until it is hoisted to the assembly position and inserted into the pipe end of the other pipe section. Finally, use external force to completely insert the pipe section to be hoisted into the pipe end of the other pipe section.

[0015] 4) Withdraw the lifting device. After the lifting is completed, withdraw the lifting device from the free end of the pipe section to be lifted, and then continue the lifting operation of the next pipe section.

[0016] Furthermore, the external force comes from a forklift or a crowbar, and the external force acts on the bottom pipe opening of the suspended pipe section.

[0017] Furthermore, the specifications of the sling are adapted according to the specifications of the pipe section to be suspended, specifically including the length of the short side, the adjustment length of the externally threaded rod and the weight of the counterweight nut.

[0018] Furthermore, the pipe section to be hoisted is placed on the pipe body bracket before hoisting to prevent accidental rolling.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) By using the lifting auxiliary device, the cement pipe section is inserted into the cement pipe section from the pipe opening on one side, and the cement pipe section is directly lifted. The device can be used to directly connect the two pipe sections at the bottom of the trench. After the pipe sections are installed and connected, the device can be easily withdrawn from the pipe opening on the other side. The operation is very convenient and smooth.

[0021] 2) The use of the lifting auxiliary device makes the entire lifting system safer and more efficient, greatly improving the lifting efficiency and effectively preventing damage to large-diameter cement pipes during the lifting process;

[0022] 3) The method of the present invention saves large-scale machine costs and labor costs, and eliminates safety and quality risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the working state of an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a spreader in an embodiment of the present invention;

[0025] In the figure: 1-sling, 2-lifting ear, 3-clamp, 4-wire rope, 5-counterweight nut, 6-crane hook, 7-external threaded rod, 8-buffer pad, 9-cement pipe section, 10-operating handle, 11-pin, 12-short side, 13-long side, 14-connecting side. DETAILED DESCRIPTION

[0026] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying any creative work.

[0028] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.

[0029] See Figure 1-2, is a schematic structural diagram of an auxiliary device for lifting underground large-diameter cement pipes according to the present invention, comprising a sling 1, a lifting lug 2, a buffer pad 8, and a counterweight mechanism. The sling 1 is a U-shaped structure of unequal height, comprising a long side 13, a short side 12, and a connecting side 14 connecting the long side and the short side. The outer end of the long side 13 is connected to the counterweight mechanism. A plurality of lifting lugs 2 are arranged side by side on the outer side of the long side 13. A buffer pad 8 is provided on the short side 12. The length of the short side 12 is not less than the length of the cement pipe section 9 to be lifted. During lifting, the sling 1 is in a horizontal state with its opening facing one side, and the buffer pad 8 supports the inner wall of the cement pipe; the lifting lug 2 is connected to the crane hook head 6 via a steel wire rope 4 and a clamp 3. The specifications of the sling 1 are adapted to the specifications of the cement pipe section 9 to be lifted, specifically including the length of the short side 12, the adjustable length of the externally threaded rod 7, and the weight of the counterweight nut 5. The sling 1 is made of steel with sufficient rigidity, such as channel steel or H-shaped steel.

[0030] The buffer pad 8 is an annular rubber structure, fixedly connected to the short side 12, and the number is 2-3. In the embodiment, the buffer pad 8 is made of a rubber tire, and the two sides of the buffer pad 8 are connected to the short side 12 by the latch 11 for limiting.

[0031] The large-diameter cement pipe applicable to the present invention is a socket-and-spigot type or a tongue-and-groove type cement pipe with a diameter specification of 500mm-3000mm.

[0032] The counterweight mechanism includes an externally threaded rod 7 and a counterweight nut 5 . The counterweight nut 5 is matched and connected to the externally threaded rod 7 . An operating handle 10 is provided on the outer periphery of the counterweight nut 5 .

[0033] The thread length of the external threaded rod 7 is 100-300 mm, and the weight of the counterweight nut 5 is 2-20 kg.

[0034] The present invention provides an operating method for an auxiliary device for lifting underground large-diameter cement pipes, including setting the center of gravity, trial lifting the counterweight, lifting the pipe body, and withdrawing the lifting device. The specific operating steps are as follows:

[0035] 1) Determine the center of gravity. According to the center of gravity of the pipe section 9 to be lifted on the short side 12 of the sling 1, determine the appropriate lifting lug 2. Ensure that the center of gravity of the lifting lug 2 and the pipe section 9 to be lifted are on the same plumb line.

[0036] 2) Test hoisting of the counterweight: the crane performs a no-load test hoist on the spreader 1. The position of the counterweight nut 5 on the external threaded rod 7 is adjusted by operating the handle 10 to ensure that the spreader 1 can maintain a horizontal state when it is no-loaded;

[0037] 3) Hoisting of the pipe body: insert the short side 12 of the hoisting device 1 into the free end pipe opening of the hoisted cement pipe section 9, start the crane to lift the hoisted cement pipe section 9, until the hoisted cement pipe section 9 is hoisted to the assembly position and inserted into the pipe opening of another pipe section, and finally use external force to completely insert the hoisted cement pipe section 9 into the pipe opening of another pipe section; the external force comes from a forklift or a crowbar, and the external force acts on the bottom pipe opening of the hoisted pipe section 9.

[0038] 4) Remove the lifting device. After the lifting is completed, remove the lifting device 1 from the free end of the pipe section 9 to continue the lifting operation of the next pipe section. The pipe section 9 should be placed on the pipe body bracket before lifting to prevent accidental rolling during operation and eliminate safety hazards.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for lifting underground large-diameter cement pipes, characterized in that: It includes a sling, a lifting lug, a buffer pad and a counterweight mechanism. The sling is a U-shaped structure with unequal heights, including a long side, a short side and a connecting side connecting the long side and the short side. The outer end of the long side is connected to the counterweight mechanism, and multiple lifting lugs are arranged side by side on the outer side of the long side. A buffer pad is provided on the short side. The length of the short side is not less than the length of the pipe section to be lifted. During lifting, the sling is in a horizontal state with the opening facing one side, and the buffer pad supports the inner wall of the cement pipe; the lifting lug is connected to the crane hook head through a wire rope and a clamp.

2. The auxiliary device for lifting underground large-diameter cement pipes according to claim 1, characterized in that: The buffer pad is an annular rubber structure, fixedly connected to the short side, and the number is 2-3.

3. The auxiliary device for lifting underground large-diameter cement pipes according to claim 2, characterized in that: The buffer pad is made of a modified rubber tire, and both sides of the buffer pad are connected with the short sides through pins for limiting.

4. The auxiliary device for lifting underground large-diameter cement pipes according to claim 1, characterized in that: The large-diameter cement pipe is a socket-and-spigot type or a tongue-and-groove type cement pipe with a diameter specification of 500mm-3000mm.

5. The auxiliary device for lifting underground large-diameter cement pipes according to claim 1, characterized in that: The counterweight mechanism includes an externally threaded rod and a counterweight nut. The counterweight nut is matched and connected to the externally threaded rod, and an operating handle is provided on the outer periphery of the counterweight nut.

6. The auxiliary device for lifting underground large-diameter cement pipes according to claim 5, characterized in that: The thread length of the external threaded rod is 100-300 mm, and the weight of the counterweight nut is 2-20 kg.

7. The method for operating the auxiliary device for lifting underground large-diameter cement pipes according to claims 1-6, characterized in that: It includes setting the center of gravity, trial lifting the counterweight, lifting the pipe body and removing the lifting equipment. The specific steps are as follows: 1) Assign the center of gravity and determine the appropriate lifting lugs according to the center of gravity of the pipe to be lifted on the short side of the sling, ensuring that the lifting lugs and the center of gravity of the pipe to be lifted are on the same plumb line; 2) Test hoisting of the counterweight: the crane performs a no-load test hoist on the spreader, and the position of the counterweight nut on the external threaded rod is adjusted by the operating handle to ensure that the spreader can maintain a horizontal state under no-load conditions; 3) Hoisting the pipe body: insert the short side of the lifting tool into the free end of the pipe section to be hoisted, start the crane to lift the pipe section to be hoisted until it is hoisted to the assembly position and inserted into the pipe end of the other pipe section. Finally, use external force to completely insert the pipe section to be hoisted into the pipe end of the other pipe section. 4) Withdraw the lifting device. After the lifting is completed, withdraw the lifting device from the free end of the pipe section to be lifted, and then continue the lifting operation of the next pipe section.

8. The method for operating the auxiliary device for lifting underground large-diameter cement pipes according to claim 7, characterized in that: The external force comes from a forklift or a crowbar, and acts on the bottom pipe opening of the suspended pipe section.

9. The method for operating the auxiliary device for lifting underground large-diameter cement pipes according to claim 7, characterized in that: The specifications of the lifting device are adapted according to the specifications of the pipe section to be lifted, specifically including the length of the short side, the adjustable length of the external threaded rod and the weight of the counterweight nut.

10. The method for operating the auxiliary device for lifting underground large-diameter cement pipes according to claim 7, characterized in that: The pipe section to be hoisted is placed on the pipe body bracket before hoisting to prevent accidental rolling.

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