Hoisting device for mounting arch bridge main beam on cable crane
By combining cable cranes and lifting devices, the main beams of the arch bridge were transported precisely, overcoming the limitations imposed by geographical conditions and water levels on construction, thus improving construction efficiency and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-03-31
AI Technical Summary
The splicing and assembly of the main beam of an arch bridge is easily restricted by geographical conditions and affected by water levels, making continuous construction difficult, which leads to slow construction progress and increased costs.
Design a lifting device for cable cranes, including a main beam support structure, a lateral movement mechanism, and lifting components. The cable crane lifts the main beam support structure from both sides of the arch bridge and moves it along the length of the arch bridge through the lateral movement mechanism, thereby achieving precise transportation of the main beam segment and replacing the barge transport method.
This eliminated the limitations imposed by geographical conditions and water levels on the splicing and assembly of the main beams of the arch bridge, reduced construction costs, and accelerated the construction progress.
Smart Images
Figure CN224062271U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of arch bridge installation and construction technology, and in particular to a lifting device for installing the main beam of an arch bridge using a cable crane. Background Technology
[0002] During the installation and construction of arch bridges, the arch frame is typically erected first, followed by the assembly of the main girder. Part of the main girder is located below the arch frame, and part is located outside the arch frame area. Currently, two methods are commonly used for assembling the main girder segment located below the arch frame. One method involves constructing a temporary road beneath the main girder and then using large transport vehicles to directly transport the girder segment to the lifting position. The other method involves using cable cranes erected on both sides of the arch bridge to lift the girder segment onto barges in the river, and then using the barges to transport it to the lifting position under the arch frame.
[0003] However, the first method is limited by geographical conditions due to the construction of access roads, making it difficult to be widely applied; the second method occupies a large area of the waterway when barges are working, affecting the passage of ships in the waterway, and is easily affected by water levels, making continuous construction impossible, which greatly delays the construction progress and increases the construction cost. Utility Model Content
[0004] This utility model aims to solve at least one of the technical problems existing in the related art. To this end, this utility model proposes a lifting device for installing the main beam of an arch bridge using a cable crane, so as to solve the problems that the splicing and assembly of the main beam of an arch bridge is easily restricted by geographical conditions, easily affected by water levels, and difficult to carry out continuous construction.
[0005] This utility model provides a lifting device for installing the main beam of an arch bridge using a cable crane. The lifting device includes:
[0006] The main beam support structure consists of two parallel, spaced-apart trusses and a connecting frame that links the two.
[0007] A transverse movement mechanism is installed on the top surface of the main beam support structure to support the main beam segment and drive the main beam segment to slide.
[0008] The hoisting component is connected to the truss and protrudes vertically from the top surface of the main beam support structure;
[0009] The main beam support structure is located below the arch bridge and its two ends protrude from the arch bridge. The two main cables of the cable crane are located above the arch bridge and are symmetrically distributed on both sides of the arch bridge, for extending downwards to connect with the lifting components via hooks.
[0010] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided, wherein the truss is provided with an upper chord, a lower chord, and web members connecting the upper chord and the lower chord;
[0011] The two upper chords are parallel to each other and extend horizontally, and the two lower chords are arranged directly below the upper chords, corresponding to each other. The web members are inclined horizontally.
[0012] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided, wherein the lateral movement mechanism extends in the same direction as the truss, and at least four of the lateral movement mechanisms are symmetrically distributed on both sides of the main beam support structure and connected to the truss.
[0013] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided. The lateral movement mechanism includes a guide rail and a sliding seat. The guide rail is fixed to the top surface of the upper chord and is arranged parallel to the extension direction of the upper chord. The sliding seat is located above the guide rail and its lower end is slidably connected to the guide rail. The upper end of the sliding seat is used to support the main beam segment.
[0014] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided. The lateral movement mechanism includes a threaded rod parallel to the upper chord. The threaded rod is installed on the upper chord and can rotate about its own central axis.
[0015] The sliding seat is provided with a threaded through hole, and the threaded rod is engaged with the threaded through hole and passes through the sliding seat.
[0016] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided. The lateral movement mechanism includes a reaction seat disposed at the end of the upper chord. One end of the threaded rod is movably engaged with the reaction seat, which provides a horizontal force to drive the sliding seat to move when the threaded rod is rotated.
[0017] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided. The lateral movement mechanism includes a driving component, which is disposed in the reaction seat on the side opposite to the guide rail. The output end of the driving component is connected to the threaded rod and is arranged to coincide with the central axis, for rotating the threaded rod.
[0018] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided, wherein two adjacent web members and the upper chord or the lower chord form an isosceles triangle.
[0019] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided, which further includes a guide chain fixing rope provided on the main beam support structure to prevent the main beam segment from shifting or overturning during lifting.
[0020] According to the present invention, a lifting device for installing the main beam of an arch bridge using a cable crane is provided. The lifting component consists of two strip plates and a connecting block arranged in an "H" shape, and through holes are respectively opened at both ends of the strip plates.
[0021] The above-mentioned technical solutions of this utility model, including one or more, have at least one of the following technical effects: the length of the main beam support structure is greater than the width of the arch bridge; the cable crane can lift the main beam support structure from both sides of the arch bridge and move it along the length of the arch bridge; and the main beam support structure is equipped with a transverse movement mechanism. The main beam segment is first lifted by the main cable hook of the cable crane and lowered onto the main beam support structure along the outside of the arch bridge. Then, it is moved from the outside of the arch bridge to directly below the arch bridge via the transverse movement mechanism. Finally, the main cable hook lifts the support structure and moves it along the length of the arch bridge to the designed position for installation. Thus, the main beam segment can be accurately transported to the lifting position below the arch bridge via the main beam support structure and the transverse movement mechanism, replacing the method of transporting the main beam segment by barge for positioning and lifting. This eliminates the limitations imposed by geographical conditions, water levels, and other factors on the extension and assembly of the main beam of the arch bridge, reduces construction costs, and accelerates the construction progress.
[0022] In addition to the technical problems solved by this utility model, the technical features of the technical solutions constituted by this utility model, and the advantages brought about by these technical features, as described above, other technical features of this utility model and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or can be learned through the practice of this utility model. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the arch bridge structure in this utility model.
[0025] Figure 2 This is a schematic diagram of the lifting device used by the cable crane to install the main beam of an arch bridge in one scenario according to this utility model.
[0026] Figure 3This is a schematic diagram of the lifting device for installing the main beam of an arch bridge using a cable crane in another scenario according to this utility model.
[0027] Figure 4 This is a schematic diagram of the lifting device for installing the main beam of an arch bridge using a cable crane in another scenario according to this utility model.
[0028] Figure 5 This is a top view of the main beam support structure in this utility model.
[0029] Figure 6 This is a side view of the main beam support structure in this utility model.
[0030] Figure 7 for Figure 6 Enlarged schematic diagram of partial view A in the middle.
[0031] Figure 8 for Figure 6 Enlarged schematic diagram of partial view B in the middle.
[0032] Figure 9 for Figure 8 Side view of the hoisting component.
[0033] Figure label:
[0034] 1. Main beam support structure; 11. Truss; 111. Upper chord; 112. Lower chord; 113. Web member; 12. Connecting frame; 2. Lateral movement mechanism; 21. Guide rail; 22. Sliding seat; 221. Threaded through hole; 23. Threaded rod; 24. Reaction seat; 25. Driving component; 3. Lifting component; 31. Connecting block; 32. Strip plate; 321. Through hole; 4. Cable crane; 41. Main cable hook; 5. Guide chain fixing rope; 60. Arch bridge; 61. Main beam of arch bridge; 610. Main beam segment; 62. Arch frame; 70. Ground. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0036] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0037] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.
[0038] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0040] In the existing technology, when installing an arch bridge, the common practice is to first erect an arch frame 62, and then assemble the main beam 61 of the arch bridge using several main beam segments 610.
[0041] like Figure 1 As shown, part of the main girder 61 of the arch bridge is located below the arch frame 62, and part is located outside the area of the arch frame 62. Currently, there are two common methods for assembling the main girder segment 610 located below the arch frame 62. One method is to first construct a temporary road under the main girder 61 of the arch bridge, and then transport the main girder segment 610 to be installed directly to the lifting position using large transport vehicles. The other method is to use cable cranes 4 erected on both sides of the arch bridge 60 to lift the main girder segment 610 to be installed onto barges in the river, and then use the barges to transport it to the lifting position under the arch frame 62. However, both of these methods are easily affected by terrain limitations or water levels, which can delay the construction progress and increase construction costs.
[0042] like Figures 2 to 9 As shown in the embodiments of this utility model, a lifting device for installing the main beam of an arch bridge using a cable crane is introduced, which can solve the above-mentioned problems.
[0043] The lifting device mainly includes the main beam support structure 1, the transverse movement mechanism 2, the lifting components 3, and the cable crane 4.
[0044] Specifically, the main beam support structure 1 has two trusses 11 arranged in parallel at intervals, and a connecting frame 12 located between the two trusses 11 for connecting the two.
[0045] A lateral movement mechanism 2 is disposed on the top surface of the main beam support structure 1 to support the main beam segment 610. After the main beam segment 610 is placed on the main beam support structure 1, the lateral movement mechanism 2 can drive the main beam segment 610 to slide relative to the main beam support structure 1 along its extension direction. A hoisting component 3 is connected to the truss 11 and protrudes vertically from the top surface of the main beam support structure 1.
[0046] Specifically, the main beam support structure 1 is located below the arch bridge 60. Furthermore, the length of the main beam support structure 1 is greater than the width of the arch bridge 60, so that both ends of the main beam support structure 1 protrude from the arch bridge 60 in the width direction, so as to facilitate the hoisting of the main beam support structure 1 from above the arch bridge 60.
[0047] In addition, two cable cranes 4 are symmetrically distributed on both sides of the arch bridge 60 above the arch bridge 60, which are used to extend the main cable hook 41 downwards to connect with the hoisting component 3.
[0048] In this embodiment, the length of the main beam support structure 1 is greater than the width of the arch bridge 60. The cable crane 4 can lift the main beam support structure 1 from both sides of the arch bridge 60 and move it along the length of the arch bridge 60. A transverse movement mechanism 2 is provided on the main beam support structure 1. The main beam segment 610 is first lifted by the main cable hook 41 of the cable crane 4 and lowered onto the main beam support structure 1 along the outside of the arch bridge. Then, it is moved from the outside of the arch bridge to directly below the arch bridge via the transverse movement mechanism 2. Finally, the main cable hook 41 lifts the main beam support structure 1 and moves it along the length of the arch bridge to the designed position for installation. Thus, the main beam segment 610 can be accurately transported to the lifting position below the arch bridge 60 via the main beam support structure 1 and the transverse movement mechanism 2, replacing the method of transporting the main beam segment 610 by barge for positioning and lifting. This eliminates the limitations imposed by geographical conditions, water levels, and other factors on the extension and assembly of the main beam 61 of the arch bridge, reducing construction costs and accelerating the construction progress.
[0049] Based on the above embodiments, another embodiment of this utility model introduces a main beam support structure 1 with greater rigidity to avoid bending when bearing the main beam segment 610.
[0050] like Figure 5 and Figure 6 As shown, the truss 11 is provided with an upper chord 111, a lower chord 112, and a web member 113 connecting the upper chord 111 and the lower chord 112. The upper chord 111 and the lower chord 112 are made of channel steel.
[0051] Specifically, the two upper chord members 111 are parallel to each other and extend horizontally; the two lower chord members 112 are corresponding one-to-one with the upper chord members 111 and are arranged parallel to each other directly below the upper chord members 111; the web members 113 are inclined in the horizontal direction, so that the bending deformation of the upper chord members 111 and the lower chord members 112 can be reduced by the support of the web members 113, thereby increasing the overall stiffness of the truss 11.
[0052] Based on the above embodiments, another embodiment of the present invention introduces a transverse movement mechanism 2 that enables the main beam segment 610 to slide smoothly on the main beam support structure 1.
[0053] like Figure 5 and Figure 6 As shown, the lateral movement mechanism 2 extends in the same direction as the truss 11, and at least four of the lateral movement mechanisms 2 are symmetrically distributed on both sides of the main beam support structure 1. Furthermore, the lateral movement mechanism 2 is connected to the truss 11.
[0054] Specifically, two trusses 11 are symmetrically distributed on both sides of the main beam support structure 1. Each truss 11 has a transverse movement mechanism 2 on its upper chord 111.
[0055] Based on the above embodiments, another embodiment of the present invention introduces a transverse movement mechanism 2 that enables the main beam segment 610 to slide smoothly.
[0056] The lateral movement mechanism 2 includes a guide rail 21 and a sliding seat 22. The guide rail 21 is fixed to the top surface of the upper chord 111 and is arranged parallel to the extension direction of the upper chord 111. The sliding seat 22 is located above the guide rail 21 and is slidably connected to the guide rail 21 at its lower end. The upper end of the sliding seat 22 is higher than the guide rail 21 and is used to support the main beam segment 610.
[0057] Based on the above embodiments, another embodiment of the present invention introduces a transverse movement mechanism 2 that can drive the main beam segment 610 to slide with a small force.
[0058] like Figure 6 and Figure 7 As shown, the lateral movement mechanism 2 includes a threaded rod 23 parallel to the upper chord 111. The threaded rod 23 is mounted on the upper chord 111. Furthermore, the threaded rod 23 is rotatable about its own central axis.
[0059] Correspondingly, the sliding seat 22 is provided with a threaded through hole 221. The threaded rod 23 is connected to the threaded through hole 221 and passes through the sliding seat 22, so that the sliding seat 22 can be moved along the threaded rod 23 by rotating the threaded rod 23, which greatly reduces the force required to drive the main beam segment 610 to move.
[0060] In another embodiment of this utility model, a transverse movement mechanism 2 is introduced to facilitate the rotation of the threaded rod 23.
[0061] like Figure 6 As shown, the lateral movement mechanism 2 includes a reaction seat 24 disposed at the end of the upper chord 111. One end of the threaded rod 23 is movably engaged with the reaction seat 24, providing a horizontal force to drive the sliding seat 22 to move when the threaded rod 23 is rotated.
[0062] Furthermore, the transverse mechanism 2 also includes a drive element 25 for driving the threaded rod 23 to rotate.
[0063] The driving component 25 is disposed in the reaction seat 24 on the side opposite to the guide rail 21. The output end of the driving component 25 is connected to the threaded rod 23 and is arranged to coincide with the central axis, allowing the threaded rod 23 to be rotated. The driving component 25 can be configured as a motor.
[0064] Based on the above embodiments, another embodiment of this utility model introduces a main beam support structure 1 with greater rigidity to avoid bending when bearing the main beam segment 610.
[0065] In the truss 11, two adjacent web members 113 form an isosceles triangle with the upper chord 111 or the lower chord 112. The bending deformation of the upper chord 111 and the lower chord 112 can be reduced by the support of the web members 113, thereby increasing the overall stiffness of the truss 11.
[0066] like Figures 2 to 4 As shown, in another embodiment of the present invention, a lifting device is introduced that can better fix the main beam segment 610 to the main beam support structure 1.
[0067] The lifting device also includes a guide chain fixing rope 5 installed on the main beam support structure 1. The guide chain fixing rope 5 passes through the main beam section 610 from bottom to top and is wound around it. At the same time, the end of the guide chain fixing rope 5 is connected to the truss 11, which can prevent the main beam section 610 from shifting or overturning during the lifting.
[0068] Furthermore, such as Figure 8 and Figure 9 As shown, the hoisting component 3 is arranged in an "H" shape, consisting of two strip plates 32 and a connecting block 31. Through holes 321 are provided at both ends of the strip plates 32 for connecting the upper chord 111 and the main cable hook 41.
[0069] like Figures 2 to 4 As shown, when installing the main girder 61 of the arch bridge, the main girder support structure 1 is placed on the ground 70 on the bank. First, a cable crane 4 lifts the main girder segment 610 to be installed onto the main girder support structure 1. It should be noted that at this time, the main girder segment 610 is offset from the set position of the main girder 61 of the arch bridge.
[0070] Then, the lateral movement mechanism 2 drives the main beam segment 610 to slide on the main beam support structure 1, aligning the main beam segment 610 with the set position in the width direction of the main beam 61 of the arch bridge. Finally, the cable crane 4, which lifts the main beam segment 610, connects the main cable hook 41 to the lifting component 3, lifts the main beam support structure 1 from both sides of the arch bridge 60, and moves the main beam support structure 1 along the length direction of the arch bridge 60, so that the main beam segment 610 is accurately transported to directly below the position to be spliced on the main beam 61 of the arch bridge. The cable crane 4 then lifts the main beam segment 610 vertically upward and completes the connection.
[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
[0072] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A hoisting device for hoisting a main girder of a cable crane mounted arch bridge, characterized in that, The utility model relates to a kind of arch bridge construction method, including: Main girder support structure (1), two trusses (11) are provided with parallel spacing and connecting frame (12) connecting both are provided with; Transverse mechanism (2), it is provided in the top surface of the main girder support structure (1), for receiving main girder section (610) and can drive main girder section (610) to slip; Hoisting component (3) is connected with the truss (11), and vertically protrude on the top surface of the main girder support structure (1); Wherein, the main girder support structure (1) is arranged below arch bridge (600) and its both ends respectively protrude on arch bridge (600), and the main cable of cable crane is arranged above arch bridge and symmetrically distributed on the both sides of arch bridge, for stretching out main cable hook (41) and the hoisting component (3) is connected with downward.
2. The hoisting device for the main girder of a cable crane mounted arch bridge according to claim 1, characterized in that, The truss (11) is provided with upper chord (111), lower chord (112) and web (113) connecting the upper chord (111) and the lower chord (112); Wherein, two the upper chord (111) is parallel and is arranged along horizontal direction, two the lower chord (112) is correspondingly arranged below the upper chord (111) with the upper chord (111) one to one and parallel, the web (113) is arranged obliquely to horizontal direction.
3. The hoisting device for the installation of the main girder of a cable crane arch bridge according to claim 2, characterized in that, The transverse mechanism (2) is arranged along the same direction with the truss (11), and at least four the transverse mechanism (2) is symmetrically distributed on the both sides of the main girder support structure (1) and is connected with the truss (11).
4. A hoisting device for use in the installation of a deck of a cable-stayed arch bridge according to claim 2 or 3, characterized in that The transverse mechanism (2) includes guide rail (21) and sliding seat (22), the guide rail (21) is fixed to the top surface of the upper chord (111) and is arranged parallel to the extension direction of the upper chord (111), the sliding seat (22) is arranged above the guide rail (21) and is slidably connected with the guide rail (21) by its lower end, and the upper end of the sliding seat (22) is used to receive main girder section (610).
5. The hoisting device for the main girder of a cable crane mounted arch bridge according to claim 4, characterized in that, The transverse mechanism (2) includes screw rod (23) parallel to the upper chord (111), and the screw rod (23) is mounted on the upper chord (111) and can rotate around its own central axis. The sliding seat (22) is provided with a threaded hole (221), and the threaded rod (23) is connected with the threaded hole (221) and penetrates the sliding seat (22).
6. The hoisting device for the installation of the main girder of a cable crane arch bridge according to claim 5, characterized in that, The transverse mechanism (2) includes counterforce seat (24) arranged at the end of the upper chord (111), and one end of the threaded rod (23) is movably connected to the counterforce seat (24), for providing horizontal force to drive the sliding seat (22) to move when rotating the threaded rod (23).
7. The hoisting device for the installation of the main girder of a cable crane arch bridge according to claim 6, characterized in that, The transverse mechanism (2) includes driving member (25), and the driving member (25) is arranged on the side of the counterforce seat (24) away from the guide rail (21), and the output end of the driving member (25) is connected with the threaded rod (23) and is arranged coaxially with the central axis, for rotating the threaded rod (23).
8. The hoisting device for the installation of the main girder of a cable crane arch bridge according to claim 2, characterized in that, Two adjacent the web (113) and the upper chord (111) or the lower chord (112) constitute an isosceles triangle.
9. The hoisting device for the main girder of the cable crane mounted arch bridge according to any one of claims 1-3, characterized in that, Also included is a guide chain fixing rope (5) arranged on the girder support structure (1) to prevent the girder segment (610) from moving and overturning during hoisting.
10. The hoisting device for use in the installation of the main girder of a cable crane arch bridge according to claim 1, characterized in that, The hoisting member (3) is arranged in an "H" shape by two strip-shaped plates (32) and a connecting block (31), and through holes (321) are formed at two ends of the strip-shaped plates (32) respectively.