Balance beam for pipe piece hoisting and hoisting method thereof

Abstract

The invention relates to the field of shield segment hoisting, in particular to a balance beam for segment hoisting and a hoisting method.The balance beam for segment hoisting comprises a cross beam, a hoisting tool, two hoisting frames and two height adjusting mechanisms, the two hoisting frames are fixedly installed at the two ends of the cross beam, and the hoisting tool is arranged in the middle of the cross beam in a lifting mode; each height adjusting mechanism comprises a chain wheel, a brake, a fixed pulley, a first steel cable, a chain and a second steel cable, the first steel cable, the chain and the second steel cable are sequentially connected, the brake is used for limiting or releasing rotation of the chain wheel, the two fixed pulleys are installed on the cross beam, each sling assembly sequentially bypasses the lower portion of one chain wheel, and the upper portion of one fixed pulley is connected to the sling. And the chain is meshed with the chain wheel. According to the embodiment of the invention, the lifting action of the lifting appliance is realized through the lifting of the lifting hook of the duct piece crane and the dead weights of the cross beam, the lifting appliance and the duct piece, so that the height of the lifting appliance is changed on line, an additional power source is not needed, the clearance of the balance beam is low, and the structural strength of the balance beam is not changed.

Description

Technical Field

[0001] The present invention relates to the field of shield segment hoisting, and particularly to a balance beam for segment hoisting.

[0002] The present invention also relates to a hoisting method for the balance beam for segment hoisting. Background Art

[0003] Currently, in subway shield tunnels, due to different formations, tunnel diameters, etc., the segment specifications used are also different. To improve the applicable range of the equipment, the performance of the shield rear support system should be compatible with 6m - 6.6m to meet the construction of segments with different diameters. However, when applying a shield that meets 6m segments to 6.6m segments, the height difference between the segment crane and the segment vehicle will increase accordingly, resulting in the balance beam being unable to reach the segment hoisting hole when the segment crane hoists the lowest layer of segments on the segment vehicle.

[0004] To solve this problem, the balance beam disclosed in the prior art (such as publication number CN205370602U) adopts a modular design. When the staff applies the shield to larger segments, they can adaptively adjust the shape of the balance beam to reduce the height of its hoisting bolt 25.

[0005] However, this design will significantly increase the height of the balance beam itself, affecting its application in the existing double - curved beam shield segment hoisting system (Optimized Design of Shield Segment Hoisting System · Wang Dajiang). At the same time, the increase in the bending amplitude of the balance beam will reduce the structural strength of the balance beam. In order to make up for the loss of the structural strength of the balance beam, designers have to increase the weight of the balance beam, further increasing the power consumption of the segment crane. Summary of the Invention

[0006] The purpose of the present invention is to provide a balance beam for segment hoisting, which aims to adjust the height of the hoisting tool of the balance beam on - line on the premise of not increasing the net clearance of the balance beam itself as much as possible, not reducing the structural strength of the balance beam, and not adding an additional power source.

[0007] To solve the above - mentioned technical problems, the present invention specifically provides the following technical solutions: A balance beam for pipe segment lifting, comprising a crossbeam, a hanger, two hangers and two height adjustment mechanisms, wherein the two hangers are fixedly installed at both ends of the crossbeam, the hanger can be arranged in the middle of the crossbeam in a lifting manner, the hanger is used to connect the pipe segments, and the two height adjustment mechanisms are symmetrically arranged on both sides of the hanger; wherein each height adjustment mechanism comprises a sprocket, a brake, a fixed pulley and a sling assembly, wherein each sling assembly comprises a first steel cable, a chain and a second steel cable connected in sequence, each of the hangers is respectively connected to a sprocket and a brake, the sprocket can rotate around a horizontal axis, the brake is used to limit or release the rotation of the sprocket, the two fixed pulleys are installed on the crossbeam and are symmetrically arranged on both sides of the hanger, each of the sling assembly passes through the bottom of one sprocket and the top of one fixed pulley in turn to connect to the hanger, and the chain is meshed with the sprocket.

[0008] Furthermore, the crossbeam includes two first channel steels that are arranged in parallel and symmetrically, and a plurality of steel plates vertically connecting the two first channel steels, the steel plates are provided with holes for the sling assembly to pass through, the hanger includes a first bearing seat welded at both ends of the two first channel steels, the sprocket is connected to the first bearing seat through a rotating shaft, the brake is fixedly mounted on one side of the hanger, and the brake is transmission-connected to the rotating shaft.

[0009] Furthermore, the hanger is tilted upward so that the axis of the sprocket is higher than the center of gravity of the balance beam for lifting the pipe segment in the direction of gravity.

[0010] Furthermore, two guide columns are arranged on both sides of the sling, and the guide columns are welded to the cross beam. The guide columns include a vertically arranged second channel steel and a slide rail fixedly connected to the second channel steel. Slide blocks slidably connected to the slide rail are arranged on both sides of the sling.

[0011] Furthermore, the net distance between the two guide posts is greater than the maximum lateral swing amplitude of the hanger within the working range.

[0012] Furthermore, a second bearing seat is installed on the top end of the guide column, and the fixed pulley is connected to the second bearing seat via a rotating shaft.

[0013] Further, the sling includes a third bearing block, a first connecting shaft, a second connecting shaft, a bolt seat, and a hoisting bolt. The third bearing block and the slider are an integral part. The first connecting shaft is vertically arranged and rotatably connected to the third bearing block. The second connecting shaft is horizontally arranged and rotatably connected to the first connecting shaft. The bolt seat is fixedly connected to the second connecting shaft. The hoisting bolt is vertically arranged and detachably and rotatably connected to the bolt seat.

[0014] Further, the bolt seat includes a tube body with an opening on one side. The tube body is fixedly connected to the second connecting shaft. The opening direction of the tube body is perpendicular to the axis of the second connecting shaft.

[0015] Further, a supporting plate with a stepped hole is arranged at the bottom of the tube body. The stepped hole is coaxial with the tube body. The step of the stepped hole is in clearance fit with the head of the hoisting bolt. The hole of the stepped hole is in clearance fit with the rod part of the hoisting bolt. One side of the stepped hole is open, and the opening direction of the stepped hole is parallel to the opening direction of the tube body.

[0016] A hoisting method for a segment hoisting balance beam. The hoisting method uses the segment hoisting balance beam. The hoisting method includes the following steps: the step of changing the segment hoisting balance beam to the first working condition. The sling is not connected to the segment. The weight of the sling is less than the weight of the cross beam. After the brake releases the sprocket, the sprocket rotates, causing the lengths of the sling assemblies on both sides of the sprocket to change, thereby causing the cross beam to descend and the sling to ascend. After the sling ascends to the maximum height, the brake restricts the sprocket again; the step of changing the segment hoisting balance beam to the second working condition. The sling is connected to the segment. The total weight of the sling and the segment is greater than the weight of the cross beam. After the brake releases the sprocket, the sprocket rotates, causing the lengths of the sling assemblies on both sides of the sprocket to change, thereby causing the sling and the segment to descend, while the cross beam ascends. After the sling descends to the minimum height, the brake restricts the sprocket again, and then the sling and the segment are separated; the step of changing the segment hoisting balance beam to the third working condition. The sling is connected to the segment, and after the segment rotates 90 degrees, the segment crane lowers the segment to a temporary bearing platform so that the segment is supported. The weight of the sling is less than the weight of the cross beam. After the brake releases the sprocket, the sprocket rotates, causing the lengths of the sling assemblies on both sides of the sprocket to change, thereby causing the cross beam to descend and the sling to ascend. After the sling ascends to the maximum height, the brake restricts the sprocket again, and then the segment crane hoists the segment again.

[0017] The present application has the following beneficial effects compared with the prior art: In an embodiment of the present invention, the lifting of the hook of the segment crane, as well as the self-weights of the crossbeam, the lifting appliance, and the segment, are utilized to achieve the lifting movement of the lifting appliance, thereby changing the height of the lifting appliance online without the need for an additional power source. Moreover, the clearance of the balance beam is relatively low, and the structural strength of the balance beam remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are merely exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0019] Figure 1 The front view of the first working condition of the embodiment of the present invention; Figure 2 The front view of the second working condition of the embodiment of the present invention; Figure 3 The top view of the first working condition of the embodiment of the present invention; Figure 4 For Figure 3 The cross-sectional view in the A-A direction of Figure 5 The perspective view of the first working condition of the embodiment of the present invention, and the enlarged view of its partial structure; Figure 6 The assembly drawing of the embodiment of the present invention; Figure 7 The assembly drawing of the lifting appliance of the embodiment of the present invention; The reference numerals in the drawings are respectively represented as follows: 1 - Crossbeam; 11 - First bearing seat; 12 - Guide post; 13 - Second bearing seat; 2 - Lifting appliance; 21 - Third bearing seat; 22 - First connecting shaft; 23 - Second connecting shaft; 24 - Bolt seat; 241 - Pipe body; 242 - Supporting plate; 243 - Step hole; 25 - Lifting bolt; 26 - Handle; 3 - Hanger; 4 - Sprocket; 5 - Brake; 6 - Fixed pulley; 7 - Suspension cable assembly; 71 - First steel cable; 72 - Chain; 73 - Second steel cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] The present invention provides a balance beam for segment hoisting, hereinafter referred to as the balance beam. Its advantages are as follows: The net space of the balance beam itself is slightly increased without changing the straightness and structural strength of the balance beam. The height of the lifting tool 2 can be adjusted by the self-weights of the balance beam and the segment, and no additional power source is required.

[0022] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the two ends of the balance beam are suspended by two segment cranes (not shown in the figure). The balance beam includes: a cross beam 1, a lifting tool 2, two hanging brackets 3 and two height adjusting mechanisms. The two hanging brackets 3 are fixedly installed at both ends of the cross beam 1. The lifting tool 2 is arranged in the middle of the cross beam 1 in a liftable manner. The lifting tool 2 is used to connect the segment. The two height adjusting mechanisms are symmetrically arranged on both sides of the lifting tool 2.

[0023] Each height adjusting mechanism includes a sprocket 4, a brake 5, a fixed pulley 6 and a sling assembly 7. Among them, each sling assembly 7 includes a first steel cable 71, a chain 72 and a second steel cable 73 connected in sequence. Each hanging bracket 3 is respectively connected to a sprocket 4 and a brake 5. The sprocket 4 can rotate around a horizontal axis. The brake 5 is used to restrict or release the rotation of the sprocket 4. The two fixed pulleys 6 are installed on the cross beam 1 and are symmetrically arranged on both sides of the lifting tool 2 respectively. Each sling assembly 7 sequentially passes under a sprocket 4, above a fixed pulley 6 and is connected to one side of the lifting tool 2, and the chain 72 meshes with the sprocket 4.

[0024] Among them, the first steel cable 71 is used to connect to the hook of the segment crane. Through the lifting and lowering of the hook of the segment crane, as well as the self-weights of the cross beam 1, the lifting tool 2 and the segment, the lifting and lowering action of the lifting tool 2 is realized, so as to change the height of the lifting tool 2 online.

[0025] Refer to Figure 1 In the first working condition shown, the lifting tool 2 is not connected to the segment. At this time, the weight of the lifting tool 2 is less than the weight of the cross beam 1. After the brake 5 releases the sprocket 4, the sprocket 4 rotates, causing the lengths of the sling assemblies 7 on both sides of the sprocket 4 to change, and then causing the cross beam 1 to descend and the lifting tool 2 to rise. After the lifting tool 2 rises to the maximum height, the brake 5 restricts the sprocket 4 again. At this time, the balance beam is used to hoist segments with a smaller diameter and a higher height during transportation.

[0026] Refer to Figure 2In the second working condition shown, the spreader 2 is connected to the segment. At this time, the total weight of the spreader 2 and the segment is greater than the weight of the crossbeam 1. After the brake 5 releases the sprocket 4, the sprocket 4 rotates, causing the lengths of the sling assemblies 7 on both sides of the sprocket 4 to change, and then causing the spreader 2 and the segment to descend, while the crossbeam 1 ascends. After the spreader 2 descends to the minimum height, the brake 5 restricts the sprocket 4 again. At this time, the spreader 2 and the segment can be separated, and the balance beam can be used to hoist segments with a larger diameter and a lower height during transportation.

[0027] In addition, there is also a third working condition (not shown in the figure). The spreader 2 is connected to the segment. After the segment rotates 90 degrees, the segment crane lowers the segment to a temporary bearing platform. At this time, the segment is supported, and the weight of the spreader 2 is less than the weight of the crossbeam 1. After the brake 5 releases the sprocket 4, the sprocket 4 rotates, causing the lengths of the sling assemblies 7 on both sides of the sprocket 4 to change, and then causing the crossbeam 1 to descend and the spreader 2 to ascend. After the spreader 2 ascends to the maximum height, the brake 5 restricts the sprocket 4 again. Then the segment crane hoists the segment again. At this time, the total height of the balance beam and the segment is the smallest. At this time, it is not necessary to separate the spreader 2 and the segment, and the balance beam can be used in occasions where the height of the transportation space is relatively low and the clearance requirement for the balance beam is relatively high, such as in the second half of the double-curved beam shield segment hoisting and transportation system.

[0028] Further, referring to Figure 4 、 Figure 5 and Figure 6 。

[0029] The crossbeam 1 includes two first channel steels arranged in parallel and symmetrically, and several steel plates vertically connecting the two first channel steels. The steel plates are provided with holes for the sling assemblies 7 to pass through. The hanger 3 includes first bearing seats 11 welded to both ends of the two first channel steels. The sprocket 4 is connected to the first bearing seats 11 through a rotating shaft. The brake 5 is fixedly installed on one side of the hanger 3, and the brake 5 is drivingly connected to the rotating shaft.

[0030] Preferably, the hanger 3 is inclined upward, so that the axis of the sprocket 4 is higher than the center of gravity of the entire balance beam (including the crossbeam 1 and the spreader 2 without carrying the segment) in the direction of gravity, to ensure the stability of the balance beam when it is lifted and avoid overturning.

[0031] Two guide columns 12 are arranged on both sides of the spreader 2. The guide columns 12 are welded to the crossbeam 1. The guide columns 12 include vertically arranged second channel steels and slide rails fixedly connected to the second channel steels. Sliders slidably connected to the slide rails are arranged on both sides of the spreader 2. Second bearing seats 13 are installed at the tops of the guide columns 12. The fixed pulley 6 is connected to the second bearing seats 13 through a rotating shaft.

[0032] Preferably, the net distance between the two guide posts 12 is greater than the maximum lateral swing amplitude that the spreader 2 may generate within the normal working range, so as to ensure the normal use of the spreader 2.

[0033] Further, referring to Figure 7 。

[0034] The spreader 2 includes: a third bearing seat 21, a first connecting shaft 22, a second connecting shaft 23, a bolt seat 24, and a lifting bolt 25.

[0035] The third bearing seat 21 and the slider are an integral part. The first connecting shaft 22 is vertically arranged and rotatably connected to the third bearing seat 21. The second connecting shaft 23 is horizontally arranged and rotatably connected to the first connecting shaft 22. The bolt seat 24 is fixedly connected to the second connecting shaft 23. The lifting bolt 25 is vertically arranged and detachably and rotatably connected to the bolt seat 24.

[0036] The third bearing seat 21, the first connecting shaft 22, the second connecting shaft 23, and the bolt seat 24 form a universal joint connecting the cross beam 1 and the lifting bolt 25. This design is used to ensure that the lifting bolt 25 has sufficient degrees of freedom, so that the lifting bolt 25 can be flexibly aligned and screwed into the threaded lifting hole on the segment by relying on its own rotation.

[0037] Preferably, a detachable handle 26 is provided on one side of the bolt seat 24. The handle 26 is used for the staff to hold the bolt seat 24 and rotate it 90 degrees, so as to rotate the direction of the segment.

[0038] Preferably, the bolt seat 24 includes a pipe body 241 with an opening on one side. The pipe body 241 is fixedly connected to the second connecting shaft 23. The opening direction of the pipe body 241 is perpendicular to the axis of the second connecting shaft 23. This design is used to limit the swing angle of the bolt seat 24, so that the swing angle of the bolt seat 24 is limited to 0° to +90°, where 0° refers to the angle when the axis of the bolt seat 24 is vertical.

[0039] Preferably, a supporting plate 242 with a stepped hole 243 is provided at the bottom of the pipe body 241. The stepped hole 243 is coaxial with the pipe body 241. The step of the stepped hole 243 has a clearance fit with the head of the lifting bolt 25, and the hole of the stepped hole 243 has a clearance fit with the rod portion of the lifting bolt 25. One side of the stepped hole 243 is open, and the opening direction of the stepped hole 243 is parallel to the opening direction of the pipe body 241. This design allows the staff to take out or insert the lifting bolt 25 from one side of the pipe body 241.

[0040] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the embodiments of the present invention.

Claims

1. A balance beam for segment hoisting, characterized in that: The invention comprises a crossbeam (1), a hanger (2), two hangers (3) and two height adjustment mechanisms, wherein the two hangers (3) are fixedly mounted at two ends of the crossbeam (1), the hanger (2) is arranged in the middle of the crossbeam (1) in a manner capable of being raised or lowered, the hanger (2) is used to connect pipe segments, and the two height adjustment mechanisms are symmetrically arranged on both sides of the hanger (2); Each height adjustment mechanism comprises a sprocket (4), a brake (5), a fixed pulley (6) and a sling assembly (7), wherein each sling assembly (7) comprises a first steel cable (71), a chain (72) and a second steel cable (73) connected in sequence, each of the hangers (3) is respectively connected to a sprocket (4) and a brake (5), the sprocket (4) is capable of rotating around a horizontal axis, the brake (5) is used to limit or release the rotation of the sprocket (4), two fixed pulleys (6) are mounted on the crossbeam (1) and are symmetrically arranged on both sides of the sling (2), each sling assembly (7) is connected to the sling (2) by passing through the bottom of a sprocket (4) and the top of a fixed pulley (6), and the chain (72) is meshed with the sprocket (4).

2. A balance beam for segment hoisting according to claim 1, characterized in that: The crossbeam (1) comprises two first channel steels which are arranged in parallel and symmetrically, and a plurality of steel plates which vertically connect the two first channel steels, wherein the steel plates are provided with holes for the sling assembly (7) to pass through, and the hanger (3) comprises a first bearing seat (11) which is welded to both ends of the two first channel steels, and the sprocket (4) is connected to the first bearing seat (11) via a rotating shaft, and the brake (5) is fixedly mounted on one side of the hanger (3), and the brake (5) is drivingly connected to the rotating shaft.

3. A balance beam for segment hoisting according to claim 2, characterized in that: The hanger (3) is arranged to tilt upward, so that the axis of the sprocket (4) is higher than the center of gravity of the balance beam for segment hoisting in the direction of gravity.

4. The balance beam for segment hoisting according to claim 1, characterized in that: Two guide columns (12) are arranged on both sides of the sling (2), and the guide columns (12) are welded to the crossbeam (1). The guide columns (12) include a second vertically arranged channel steel and a slide rail fixedly connected to the second channel steel. Slide blocks slidably connected to the slide rails are arranged on both sides of the sling (2).

5. A balance beam for segment hoisting according to claim 4, characterized in that: The net distance between the two guide columns (12) is greater than the maximum lateral swing amplitude of the sling (2) within the working range.

6. A balance beam for segment hoisting according to claim 4, characterized in that: A second bearing seat (13) is mounted on the top end of the guide column (12), and the fixed pulley (6) is connected to the second bearing seat (13) via a rotating shaft.

7. A balance beam for segment hoisting according to claim 1, wherein the sling (2) includes a third bearing block (21), a first connecting shaft (22), a second connecting shaft (23), a bolt seat (24) and a hoisting bolt (25). The third bearing block (21) and the slider are an integral part. The first connecting shaft (22) is vertically arranged and rotatably connected to the third bearing block (21). The second connecting shaft (23) is horizontally arranged and rotatably connected to the first connecting shaft (22). The bolt seat (24) is fixedly connected to the second connecting shaft (23). The hoisting bolt (25) is vertically arranged and detachably and rotatably connected to the bolt seat (24).

8. A balance beam for segment hoisting according to claim 7, wherein the bolt seat (24) includes a pipe body (241) with an opening on one side. The pipe body (241) is fixedly connected to the second connecting shaft (23). The opening direction of the pipe body (241) is perpendicular to the axis of the second connecting shaft (23).

9. A balance beam for segment hoisting according to claim 8, wherein a supporting plate (242) with a stepped hole (243) is arranged at the bottom of the pipe body (241). The stepped hole (243) is coaxial with the pipe body (241). The step of the stepped hole (243) is in clearance fit with the head of the hoisting bolt (25). The hole of the stepped hole (243) is in clearance fit with the rod part of the hoisting bolt (25). One side of the stepped hole (243) is open, and the opening direction of the stepped hole (243) is parallel to the opening direction of the pipe body (241).

10. A hoisting method for a balance beam for segment hoisting, wherein the hoisting method uses the balance beam for segment hoisting according to any one of claims 1-9, and the hoisting method includes the following steps: The step of changing the balance beam for segment hoisting to the first working condition. The sling (2) is not connected to the segment. The weight of the sling (2) is less than the weight of the cross beam (1). After the brake (5) releases the sprocket (4), the sprocket (4) rotates, causing the lengths of the sling assemblies (7) on both sides of the sprocket (4) to change, thereby causing the cross beam (1) to descend and the sling (2) to ascend. After the sling (2) ascends to the maximum height, the brake (5) restricts the sprocket (4) again. The step of changing the balance beam for segment hoisting to the second working condition. The sling (2) is connected to the segment. The total weight of the sling (2) and the segment is greater than the weight of the cross beam (1). After the brake (5) releases the sprocket (4), the sprocket (4) rotates, causing the lengths of the sling assemblies (7) on both sides of the sprocket (4) to change, thereby causing the sling (2) and the segment to descend, while the cross beam (1) ascends. After the sling (2) descends to the minimum height, the brake (5) restricts the sprocket (4) again, and then the sling (2) and the segment are separated. The steps for the balance beam for segment hoisting to change to the third working condition are as follows. The spreader (2) is connected to a segment. After the segment rotates 90 degrees, the segment crane lowers the segment to a temporary bearing platform so that the segment is supported. The weight of the spreader (2) is less than the weight of the cross beam (1). After the brake (5) releases the sprocket (4), the sprocket (4) rotates, causing the lengths of the sling assemblies (7) on both sides of the sprocket (4) to change, thereby causing the cross beam (1) to descend and the spreader (2) to ascend. After the spreader (2) ascends to the maximum height, the brake (5) restricts the sprocket (4) again, and then the segment crane hoists the segment again.

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