Precast concrete pipe joint vertical hoisting tool and construction method thereof

Abstract

The invention provides a prefabricated concrete pipe joint vertical hoisting tool and a construction method thereof. The hoisting tool comprises a chassis, a fixed part, a sliding part, a hoisting ring and a plurality of supporting parts, the bottom end of the fixing piece is connected to the chassis; the hanging ring is arranged at the top of the fixing part; the sliding piece is in sliding connection with the fixed piece and can reciprocate in the length direction of the fixed piece; the supporting piece comprises a first supporting rod and a second supporting rod; the bottom end of the second supporting rod is hinged to the base plate, the top end of the second supporting rod is provided with a supporting part used for abutting against the inner wall of the pipe joint, and a connecting part is arranged between the bottom end and the top end of the second supporting rod. One end of the first supporting rod is hinged to the sliding piece, and the other end is hinged to the connecting part. According to the invention, the vertical hoisting of the pipe joint is safer, the assembly and disassembly are more convenient, the hoisting operation time is saved, and the pipe joint can be effectively prevented from being damaged; and the stability, reliability and safety of the pipe joints in the hoisting process are improved, and the pipe joint hoisting device can be suitable for pipe joints with different pipe diameters and is convenient to recycle.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe segment hoisting, and in particular relates to a vertical hoisting tool for a precast concrete pipe segment and a construction method thereof. Background Art

[0002] In the construction process of building projects and municipal engineering, some pipe segments often need to be lifted vertically, especially prefabricated concrete pipe segments with larger diameter (≥1.5m), shorter length (≤3m), and heavier weight (≥5 tons), which usually require a lifting angle of ≤2°. In the existing technology, fixed lifting devices or wire rope bundling methods are mostly used for pipe segment lifting operations. However, fixed lifting devices cannot adapt to pipe segments of different diameters or lengths, and the lifting devices need to be replaced frequently, which is time-consuming and labor-intensive. In addition, direct contact between the lifting devices and the pipe segments can easily cause indentations on the surface of the pipe segments or internal cracks. The use of wire rope bundling can easily lead to uneven force on the pipe segments, which are prone to shaking or tilting during lifting, posing a safety hazard and failing to meet strict vertical lifting requirements. In addition, in the above two methods, the lifting devices need to be welded or assembled on site, and the lifting height and angle need to be adjusted. The operation is cumbersome and difficult, which seriously affects construction efficiency. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a precast concrete pipe segment vertical lifting tool and a construction method thereof, which makes the vertical lifting of the pipe segment safer and the installation and removal more convenient, saves the time of the lifting operation, and can effectively prevent the pipe segment from being damaged.

[0004] The technical solution adopted by the present invention is: a vertical lifting tool for precast concrete pipe sections, comprising: a chassis, a fixing part, a sliding part, a lifting ring and a plurality of support parts; the bottom end of the fixing part is connected to the chassis; the lifting ring is arranged at the top end of the fixing part; the sliding part is slidably connected to the fixing part and can move back and forth along the length direction of the fixing part; the support part comprises a first support rod and a second support rod; the bottom end of the second support rod is hinged to the chassis, and the top end is provided with a support portion for abutting against the inner wall of the pipe section, and a connecting portion is provided between the bottom end and the top end of the second support rod; one end of the first support rod is hinged to the sliding part, and the other end is hinged to the connecting portion.

[0005] Furthermore, the support members are evenly arranged around the fixing member in the circumferential direction.

[0006] Furthermore, projections of the first support rod and the second support rod on the chassis extend along the radial direction of the fixing member.

[0007] Furthermore, the sliding member is sleeved on the fixing member, and the inner diameter of the sliding member is larger than the outer diameter of the fixing member.

[0008] Furthermore, a plurality of first hinge seats are evenly arranged on the circumference of the outer wall of the sliding member, the connecting portion is provided with a second hinge seat, and the chassis is provided with a third hinge seat. The first hinge seat, the second hinge seat and the second hinge seat all include pin shafts, and the pin shafts are all arranged perpendicular to the radial direction of the fixing member.

[0009] Furthermore, the support portion includes an anti-slip support foot, the anti-slip support foot includes an anti-slip surface arranged back to the fixing member, and the anti-slip surface is provided with a flexible pad.

[0010] Furthermore, the first support rod is a telescopic rod with adjustable length.

[0011] Furthermore, the first support rod includes an adjusting member and connecting rods provided at both ends of the adjusting member. The adjusting member is a cavity structure with openings at both ends. The connecting rod is threadedly connected to the adjusting member.

[0012] Furthermore, the second support rod includes a plurality of detachably connected support sections, and adjacent support sections are connected by bolts.

[0013] The construction method using any of the above-mentioned precast concrete pipe segment vertical lifting tools comprises the following steps:

[0014] Move the sliding piece along the fixing piece toward the lifting ring to retract the supporting piece inward;

[0015] placing the precast concrete pipe segment vertical lifting tool into the precast concrete pipe segment;

[0016] Controlling the sliding member to move toward the bottom end of the fixing member so that the supporting portion abuts against the inner wall of the precast concrete pipe segment, and adjusting the length of the first supporting rod so that the supporting portion abuts against the inner wall of the precast concrete pipe segment;

[0017] connecting the lifting ring to the lifting equipment;

[0018] After the hoisting operation is completed, the length of the first support rod is adjusted to separate the support portion from the inner wall of the precast concrete pipe segment, and the vertical hoisting tool of the precast concrete pipe segment is completely removed.

[0019] The advantages and positive effects of the present invention are:

[0020] (1) By setting up a chassis, fixings, sliding parts, lifting rings and multiple supporting parts, the vertical lifting of the pipe section is safer and the installation and removal are more convenient, which saves the time of the lifting operation and effectively prevents the pipe section from being damaged.

[0021] (2) The sliding part is designed to be sleeved on the fixed part so that the sliding part can move freely along the fixed part; the bottom end of the second support rod is hinged to the chassis, one end of the first support rod is hinged to the sliding part, and the other end is hinged to the connecting part; the first support rod and the second support rod are evenly arranged around the fixed part, and the projections of the first support rod and the second support rod on the chassis extend along the radial direction of the fixed part, thereby improving the stability of the support connection structure, not only making the circumferential force of the pipe section more balanced, but also improving the reliability and safety of the pipe section during the lifting process.

[0022] (3) The setting of sliding parts and supporting parts makes it applicable to precast concrete pipe sections of different pipe diameters, realizing overall installation and removal, making it more convenient for turnover and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the connection between a fixing member and a supporting member according to a specific embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection between the first support rod and the second support rod according to a specific embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the connection between the support member and the chassis according to a specific embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the use of a specific embodiment of the present invention.

[0028] In the picture:

[0029] 1. Chassis; 11. Third articulated seat; 2. Fixing member; 3. Sliding member; 31. First articulated seat; 4. Support member; 41. Second support rod; 411. Second articulated seat; 412. Support portion; 42. First support rod; 421. Adjusting member; 422. Connecting rod; 5. Lifting ring; 6. Pipe joint. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0031] The embodiment of the present invention provides a vertical lifting tool for precast concrete pipe segments, such as Figures 1 to 5As shown, the vertical lifting tool for the precast concrete pipe segment 6 includes: a chassis 1, a fixing member 2, a sliding member 3, a lifting ring 5 and a plurality of support members 4; the bottom end of the fixing member 2 is connected to the chassis 1; the lifting ring 5 is arranged at the top end of the fixing member 2; the sliding member 3 is slidably connected to the fixing member 2 and can move back and forth along the length direction of the fixing member 2; the support member 4 includes a first support rod 42 and a second support rod 41; the bottom end of the second support rod 41 is hinged to the chassis 1, and the top end is provided with a support portion 412 for abutting against the inner wall of the pipe segment 6, and a connecting portion is provided between the bottom end and the top end of the second support rod 41; one end of the first support rod 42 is hinged to the sliding member 3, and the other end is hinged to the connecting portion. It should be noted that, since the sliding member 3 can slide along the fixing member 2, and the first support rod 42 is hingedly connected to the sliding member 3, then by moving the sliding member 3, one end of the first support rod 42 can be driven to move along the length direction of the fixing member 2 and rotate around the hinge point between it and the sliding member 3; and the other end of the first support rod 42 is hingedly connected to the second support rod 41. Therefore, when the first support rod 42 moves along the length direction of the fixing member 2, the relative angle between the second support rod 41 and the fixing member 2 can be adjusted, thereby making the second support rod 4 The support portion 412 at the top of the pipe segment 6 moves away from or close to the fixing member 2 to abut against the inner wall of the pipe segment 6 or the inner wall of the joint; when the support portion 412 abuts against the inner wall of the pipe segment 6, the support member 4 provides an oblique upward supporting force to the pipe segment 6. The supporting force can be decomposed into a horizontal component and a vertical component. The horizontal component forms an effective positive pressure on the side wall of the pipe segment 6, so that an upward friction force is generated between the support portion 412 and the pipe segment 6 during the lifting process, which, together with the vertical component of the supporting force, resists the weight of the pipe segment 6 itself, thereby achieving stable and safe lifting of the pipe segment 6.

[0032] By using the above-mentioned vertical lifting tool for the precast concrete pipe segment 6, when it is needed, first place it as a whole in the pipe segment 6, then adjust the sliding member 3 to move along the fixing member 2 toward its bottom end, so that the supporting portion 412 of the second support rod 41 is away from the fixing member 2, until multiple supporting portions 412 are all in contact with the inner wall of the pipe segment 6, and then connect the lifting ring 5 on the top of the fixing member 2 with the lifting equipment. Since the lifting equipment forms an upward pulling force on the lifting ring 5 and the fixing member 2 during lifting, the fixing member 2 has an upward movement trend relative to the sliding member 3, thereby causing the supporting member 2 to move upward. The part 412 is pressed against the inner wall of the pipe segment 6, forming sufficient supporting force for the pipe segment 6 to realize the vertical lifting of the pipe segment 6; and after the pipe segment 6 is lifted into place, the sliding member 3 is adjusted to move toward its top along the fixing member 2, so that the supporting part 412 of the second support rod 41 is close to the fixing member 2, so that the supporting part 412 is separated from the inner wall of the pipe segment 6, and the vertical lifting tool of the precast concrete pipe segment 6 can be removed as a whole; compared with the existing lifting method, the present application is not only safer and more convenient to install and disassemble, but also saves the time of lifting operation, and can effectively prevent the pipe segment 6 from being damaged.

[0033] It should be noted that, in the above embodiment, the shape of the chassis 1 is much smaller than the shape of the pipe section 6 to be hoisted, so that the overall hoisting tool can be placed inside the pipe section 6; the second support rod 41 has a sufficient length to enable it to cooperate with the first support rod 42 and abut against the inner wall of the pipe section 6; the first support rod 42 has a sufficient length so that the support portion 412 of the second support rod 41 can expand outward to a sufficient range after being away from the fixing member 2 to adapt to the current status of the pipe section 6; preferably, the length of the first support rod 42 should satisfy that when it is perpendicular to the fixing member 2, the second support rod 41 is inclined outward relative to the fixing member 2.

[0034] Furthermore, in the embodiment of the present application, the support members 4 are evenly arranged around the fixing member 2. That is, the first support rods 42 and the second support rods 41 are evenly arranged around the fixing member 2, and the support portions 412 are also evenly arranged around the fixing member 2. This enables the multiple support portions 412 to form a uniform supporting force on the pipe segment 6 when they abut against the inner wall of the pipe segment 6, making the circumferential force on the pipe segment 6 more balanced, which is conducive to improving the stability and safety of the pipe segment 6 during the lifting process.

[0035] Furthermore, in the embodiment of the present application, the projections of the first support rod 42 and the second support rod 41 on the chassis 1 extend along the radial direction of the fixing member 2 . It should be noted that, through this arrangement, one end of the first support rod 42 is hinged to the sliding member 3, and its axis, hinge point and the axis of the fixing member 2 are in the same vertical plane; the other end of the first support rod 42 is hinged to the second support rod 41, and its axis, hinge point and the second support rod 41 are in the same vertical plane; the axis of the second support rod 41 and the hinge point on the chassis 1 are in the same vertical plane, so the axis of the first support rod 42, the axis of the second support rod 41 and the above-mentioned hinge point are all in the same vertical plane. By rationally arranging the hinge point and the axis of the support member 4, the connection structure of the support member 4 is confined to a two-dimensional plane. This arrangement not only avoids lateral forces (such as lateral swing or torsion) that may occur in three-dimensional space, significantly improves the structure's anti-deviability in the vertical direction, but also makes the first support rod 42 and the second support rod 41 only bear axial force, avoids the generation of bending moment, improves the stability of the connection structure of the support member 4, avoids deformation or stiffness reduction after long-term use, and improves reliability of use.

[0036] Furthermore, in the embodiment of the present application, the sliding member 3 is sleeved on the fixed member 2, and its inner diameter is larger than the outer diameter of the fixed member 2. The sliding member 3 is used to drive one end of the first support to move along the length direction of the fixed member 2. The inner diameter of the sliding member 3 is larger than the outer diameter of the fixed member 2, and the two form a clearance fit to reduce the friction resistance between the sliding member 3 and the fixed member 2, allowing the sliding member 3 to move freely along the fixed member 2. It should be noted that the inner diameter of the sliding member 3 should not be too large to prevent the movement path of the sliding member 3 from deviating radially from the fixed member 2, so that the sliding member 3 can drive multiple supports 4 to move in the same motion state, ensuring that the distance between the multiple support portions 412 and the fixed member 2 is substantially the same during movement, and can simultaneously abut against the inner wall of the pipe segment 6, so that the force applied to the pipe segment 6 is more uniform. At the same time, the sliding member 3 is sleeved on the fixed member 2, so that the sliding member 3 has a larger range of movement, so that the distance between the support portion 412 and the fixed member 2 has a larger adjustable range to adapt to pipe segments 6 of different diameters.

[0037] In some other embodiments of the present application, the fixing member 2 can also be configured to have multiple sliding grooves arranged along its axial direction, and the sliding member 3 is slidably connected in the sliding groove, which can also realize the sliding cooperation between the sliding member 3 and the fixing member 2; other structural forms that can realize the sliding connection between the sliding member 3 and the fixing member 2 can also be adopted, which is not limited here.

[0038] Furthermore, in the embodiments of the present application, Figures 2 to 4 As shown, a plurality of first hinge seats 31 are evenly arranged around the outer wall of the sliding member 3, a second hinge seat 411 is provided at the connecting portion, and a third hinge seat 11 is provided at the chassis 1. The first hinge seat 31, the second hinge seat 411, and the second hinge seat 411 all include pins, and the pins are all arranged perpendicular to the radial direction of the fixing member 2. Specifically, one end of the first support rod 42 is connected to the first hinge seat 31, and the pin of the first hinge seat 31 passes perpendicularly through the end of the first support rod 42; the other end of the first support rod 42 is connected to the second hinge seat 411 of the second support rod 41, and the pin of the second hinge seat 411 is parallel to the pin of the first hinge seat 31 and passes perpendicularly through the end of the first support rod 42; the bottom end of the second support rod 41 is connected to the third hinge seat 11 of the chassis 1, and the pin of the third hinge seat 11 is parallel to the pin of the second hinge seat 411 and passes perpendicularly through the bottom end of the second support rod 41. Through this arrangement, the first support rod 42 can rotate around the first articulated seat 31, the first support rod 42 and the second support rod 41 can rotate relative to each other, and the second support rod 41 can rotate around the third articulated seat 11, forming multi-angle coordinated cooperation, which can not only ensure the stability of the overall structure and the smooth rotation of each component, but also make the overall structure more compact, avoid mutual influence between components, facilitate the expansion and contraction of the overall support member 4, and improve the stability of the structure and the convenience of using lifting tools.

[0039] Furthermore, in an embodiment of the present application, the support portion 412 includes an anti-slip support foot, and the anti-slip support foot includes an anti-slip surface arranged back to the fixing member 2, and the anti-slip surface is provided with a flexible pad; specifically, the flexible pad has good toughness and anti-deformation properties, and can be compressed and deformed when the anti-slip support foot abuts against the inner wall of the pipe segment 6, so as to ensure that there is sufficient contact area between the anti-slip surface and the inner wall of the pipe segment 6, which can achieve an anti-slip effect on the one hand, and avoid hard contact between the anti-slip support foot and the pipe segment 6 at the same time, thereby forming protection for the inner wall of the pipe segment 6 to prevent it from being scratched or squeezed due to the supporting force of the support member 4.

[0040] Furthermore, in an embodiment of the present application, the first support rod 42 is a telescopic rod with adjustable length. In the present application, since the sliding member 3 can automatically slide along the fixing member 2, when the sliding member 3 is located at different positions of the fixing member 2, the distance between the support portion 412 of the support member 4 and the fixing member 2 is different, so that it can be adapted to pipe sections 6 of different diameters; it is understandable that when the first support rod 42 is perpendicular to the fixing rod, the distance between the support portion 412 of the second support rod 41 and the fixing member 2 is the largest, that is, the length of the first support rod 42 limits the maximum pipe diameter that the lifting tool can be applied to; therefore, in the present application, by setting the first support rod 42 as a telescopic rod with adjustable length, the lifting tool can have a wider range of adjustment for the distance between the support portion 412 and the fixing member 2, and can be applied to the lifting of pipe sections 6 of larger diameters.

[0041] Furthermore, in the above embodiment, the first support rod 42 also has an auxiliary installation function. Specifically, when the integral lifting tool is placed inside the pipe segment 6, the position of the sliding member 3 is first adjusted so that the support portion 412 makes initial contact with the inner wall of the pipe segment 6. Then, by adjusting the length of the first support rod 42 to extend it, the support portion 412 can be pressed against the inner wall of the pipe segment 6, thereby improving the reliability and convenience of the connection between the lifting tool and the pipe segment 6.

[0042] In an optional technical solution of the above embodiment, the first support rod 42 includes an adjusting member 421 and a connecting rod 422 arranged at both ends of the adjusting member 421. The adjusting member 421 is a cavity structure with openings at both ends, and the connecting rod 422 is threadedly connected to the adjusting member 421; specifically, one end of the connecting rod 422 is provided with an external thread, and the two ends of the adjusting member 421 are provided with internal threads adapted thereto, and the threaded end of the connecting member extends into the cavity of the adjusting member 421. By rotating the adjusting member 421, the length of the two connecting members extending into the adjusting member 421 can be adjusted, thereby adjusting the overall length of the first support rod 42.

[0043] Furthermore, the second support rod 41 includes several detachably connected support sections, and adjacent support sections are connected by bolts; through this arrangement, the adjustment range of the distance between the support portion 412 of the second support rod 41 and the fixing member 2 is further increased, so that the lifting tool can be suitable for pipe sections 6 of different diameters.

[0044] The present application also proposes a construction method using the above-mentioned precast concrete pipe segment vertical lifting tool, comprising the following steps:

[0045] S1. Move the sliding member 3 along the fixing member 2 toward the lifting ring 5 to retract the supporting member 4 inwards.

[0046] S2, placing the vertical lifting tool of the precast concrete pipe segment 6 into the precast concrete pipe segment 6;

[0047] Specifically, the vertical lifting tool for the precast concrete pipe segment 6 is placed at a set height inside the precast concrete pipe segment 6 so that the operator can manually operate the sliding member 3 to move above the pipe segment 6;

[0048] S3. Control the sliding member 3 to move toward the bottom end of the fixing member 2 so that the supporting portion 412 abuts against the inner wall of the precast concrete pipe segment 6. Adjust the length of the first supporting rod 42 so that the supporting portion 412 abuts against the inner wall of the precast concrete pipe segment 6.

[0049] Specifically, in this step, the first support rod 42 is adjusted to extend;

[0050] S4, connecting the lifting ring 5 to the lifting equipment;

[0051] S5. After the hoisting operation is completed, the length of the first support rod 42 is adjusted to separate the support portion 412 from the inner wall of the precast concrete pipe segment 6, and the vertical hoisting tool of the precast concrete pipe segment 6 is completely removed.

[0052] The advantages and positive effects of the present invention are:

[0053] (1) By setting up a chassis, fixings, sliding parts, lifting rings and multiple supporting parts, the vertical lifting of the pipe section is safer and the installation and removal are more convenient, which saves the time of the lifting operation and effectively prevents the pipe section from being damaged.

[0054] (2) The sliding part is designed to be sleeved on the fixed part so that the sliding part can move freely along the fixed part; the bottom end of the second support rod is hinged to the chassis, one end of the first support rod is hinged to the sliding part, and the other end is hinged to the connecting part; the first support rod and the second support rod are evenly arranged around the fixed part, and the projections of the first support rod and the second support rod on the chassis extend along the radial direction of the fixed part, thereby improving the stability of the support connection structure, not only making the circumferential force of the pipe section more balanced, but also improving the reliability and safety of the pipe section during the lifting process.

[0055] (3) The setting of sliding parts and supporting parts makes it applicable to precast concrete pipe sections of different pipe diameters, realizing overall installation and removal, making it more convenient for turnover and reducing construction costs.

[0056] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A vertical lifting tool for precast concrete pipe segments, characterized in that: include: A chassis, a fixing part, a sliding part, a lifting ring and multiple support parts; the bottom end of the fixing part is connected to the chassis; the lifting ring is arranged at the top end of the fixing part; the sliding part is slidably connected to the fixing part and can move back and forth along the length direction of the fixing part; the support part includes a first support rod and a second support rod; the bottom end of the second support rod is hinged to the chassis, and the top end is provided with a support part for abutting against the inner wall of the pipe section, and a connecting part is provided between the bottom end and the top end of the second support rod; one end of the first support rod is hinged to the sliding part, and the other end is hinged to the connecting part.

2. The vertical lifting tool for precast concrete pipe segments according to claim 1 is characterized in that: The support members are evenly arranged around the fixing member in a circumferential direction.

3. The vertical lifting tool for precast concrete pipe segments according to claim 2, characterized in that: Projections of the first support rod and the second support rod on the chassis extend along a radial direction of the fixing member.

4. The vertical lifting tool for precast concrete pipe segments according to any one of claims 1 to 3, characterized in that: The sliding member is sleeved on the fixing member, and the inner diameter of the sliding member is larger than the outer diameter of the fixing member.

5. The vertical lifting tool for precast concrete pipe segments according to claim 4 is characterized in that: The outer wall of the sliding member is evenly circumferentially provided with a plurality of first hinge seats, the connecting portion is provided with a second hinge seat, and the chassis is provided with a third hinge seat. The first hinge seat, the second hinge seat and the second hinge seat all include pin shafts, and the pin shafts are all arranged perpendicular to the radial direction of the fixing member.

6. The vertical lifting tool for precast concrete pipe segments according to claim 5, characterized in that: The support portion includes an anti-slip support foot, and the anti-slip support foot includes an anti-slip surface arranged back to the fixing member, and the anti-slip surface is provided with a flexible pad.

7. The vertical lifting tool for precast concrete pipe segments according to claim 1, 2, 3 or 6, characterized in that: The first support rod is a telescopic rod with adjustable length.

8. The vertical lifting tool for precast concrete pipe segments according to claim 7, characterized in that: The first support rod includes an adjusting member and connecting rods provided at both ends of the adjusting member. The adjusting member is a cavity structure with openings at both ends. The connecting rod is threadedly connected to the adjusting member.

9. The vertical lifting tool for precast concrete pipe segments according to claim 8, characterized in that: The second support rod includes a plurality of detachably connected support sections, and adjacent support sections are connected by bolts.

10. A construction method using the vertical lifting tool for precast concrete pipe segments according to any one of claims 1 to 9, characterized in that: The following steps are involved: Move the sliding piece along the fixing piece toward the lifting ring to retract the supporting piece inward; placing the precast concrete pipe segment vertical lifting tool into the precast concrete pipe segment; Controlling the sliding member to move toward the bottom end of the fixing member so that the supporting portion abuts against the inner wall of the precast concrete pipe segment, and adjusting the length of the first supporting rod so that the supporting portion abuts against the inner wall of the precast concrete pipe segment; connecting the lifting ring to the lifting equipment; After the hoisting operation is completed, the length of the first support rod is adjusted to separate the support portion from the inner wall of the precast concrete pipe segment, and the vertical hoisting tool of the precast concrete pipe segment is completely removed.

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