Construction method of close-to-suspension bridge front anchor room

Abstract

The application relates to a suspension bridge front anchor chamber close method construction method, which comprises the following steps: step one: digging a foundation pit of a front anchor chamber at a predetermined position and building an anchor stock, and then hoisting a plurality of steel cables to front anchor surfaces of anchor stocks at two ends of a suspension bridge; step two: respectively passing two ends of the plurality of steel cables through front anchor surface anchor pads of the anchor stocks at the two ends of the suspension bridge and anchoring the steel cables to the anchor stocks; step three: folding the plurality of steel cables to form main cables of the suspension bridge; step four: erecting a scaffold on the steel cables scattered at the ends of the main cables, erecting a transverse support beam on the top of the foundation pit at the steel cable dense position, and continuously erecting the scaffold based on the support beam; step five: erecting a top cover formwork on the top of the scaffold; and step six: pouring concrete in the top cover formwork to form a top cover to close the foundation pit and form the front anchor chamber. The application has the effect of conveniently erecting a scaffold above the main cable dense position to pour a top cover above the front anchor chamber and improving the safety of a top cover formwork structure.

Description

Technical Field

[0001] This application relates to the field of bridge construction, and in particular to a method for constructing suspension bridges using the method of close proximity to the front anchorage. Background Technology

[0002] When constructing the main cable of a suspension bridge, anchors are manufactured at both ends of the suspension bridge to anchor the main cable and improve its stability. After the main cable is anchored, a front anchor chamber is usually built at the location of the anchor to enclose the anchor and the main cable, thereby protecting the anchor, the main cable and the cable anchoring unit.

[0003] The existing method involves first constructing anchors in the foundation pit to anchor the multiple steel cables in the main cable to the anchors. Then, scaffolding is erected in the foundation pit, except where the main cable is located, to support the top cover template of the front anchor chamber. After pouring concrete on the top cover template, the top cover of the front anchor chamber is formed, thus sealing the connection between the anchor and the main cable.

[0004] Regarding the aforementioned technologies, when a thicker front anchor chamber roof needs to be constructed, more scaffolding needs to be erected. However, in areas where the main cable steel cables are densely packed, it is difficult for construction workers to erect scaffolding, making the load-bearing capacity of the scaffolding insufficient to support the roof formwork, which can easily lead to a quality accident such as roof collapse. Summary of the Invention

[0005] In order to improve the safety of the top cover formwork structure by erecting scaffolding above the dense main cable area and pouring the top cover above the front anchorage, this application provides a construction method for the front anchorage of a suspension bridge by close proximity.

[0006] The suspension bridge front anchorage chamber proximity construction method provided in this application includes: Step 1: Excavate the foundation pit of the front anchor chamber at the predetermined location and construct the anchor. After passing both ends of several steel cables through the gantry of the suspension bridge, hoist them to the front anchor face of the anchor at both ends of the suspension bridge. Step 2: Pass the two ends of several steel cables through the front anchor plates of the anchors at both ends of the suspension bridge and anchor them to the anchors; Step 3: Join several steel cables together to form the main cable of the suspension bridge; Step 4: Erect scaffolding inside the pit, and erect horizontal support beams at the top of the pit where the steel cables are dense, and continue to erect scaffolding based on the support beams; Step 5: Install the top cover template at the top of the scaffolding; Step Six: Pour concrete inside the top cover template to form the top cover, which closes the foundation pit and forms the front anchor chamber.

[0007] By adopting the above technical solution, construction workers insert the steel cables at the ends of the main cable into the corresponding anchor plates to anchor them to the anchor. Then, all the steel cables are gathered together to form the main cable. At this time, the part of the main cable end far from the front anchor surface is too dense to place the scaffolding columns. Therefore, a horizontal support beam is erected directly above the dense part of the main cable, and the scaffolding is erected on the support beam. The scaffolding columns do not need to pass through the dense part of the main cable to support the top cover formwork. This support method uses the foundation pit and support beam as the foundation without further construction on the main cable. The scaffolding is used to stably support the top cover formwork at the dense part of the main cable, reducing the risk of the top cover collapsing during construction and thus increasing the structural stability of the top cover.

[0008] Preferably, the main cable in the front anchor chamber includes a scattering portion near the front anchor surface and a converging portion away from the front anchor surface; a plurality of the steel cables of the scattering portion are staggered in the height direction of the front anchor surface and are arranged in a straight line in the horizontal direction in the width direction; The method for erecting scaffolding in the foundation pit includes: passing the horizontal column of the scaffolding through the radiating part, installing the vertical column of the scaffolding on the horizontal column, and when encountering the steel cable of the radiating part in the vertical direction, moving the vertical column horizontally to the gap between the adjacent steel cables and installing it on the horizontal column, and continuing to erect the horizontal column and the vertical column on the vertical column until the erection of the scaffolding is completed.

[0009] By adopting the above technical solution, because the steel cables in the scattering section are misaligned in the vertical direction, it is difficult for the scaffolding columns to pass directly through the scattering section as a whole. Therefore, multiple horizontal columns of the scaffolding are first inserted in the horizontal direction, and then the columns are placed between two adjacent steel cables and connected to the horizontal columns to complete the scaffolding construction. By converting the horizontal columns, the columns that are difficult to place vertically are passed through the steel cables in the scattering section, so that the columns can exist stably in the scattering section and support the top cover of the foundation pit. Moreover, the main cable is located in the middle of the foundation pit. The columns are inserted in the scattering section of the main cable to support the top cover formwork in the middle position of the foundation pit, which can effectively improve the support of the scaffolding for the top cover formwork and reduce the risk of the top cover collapsing from the center during construction.

[0010] Preferably, the uprights are fixedly connected to the horizontal columns to form a complete frame according to the gap between the anchor plates on the front anchor surface, and the uprights correspond to the gap between the steel cables of the radiating part; the complete frame is provided in a plurality of such frames and arranged in a direction away from the front anchor surface to close to the front anchor surface; The method of step two includes: placing several of the frames vertically in the foundation pit, and then passing the steel cable through the frames and the front anchor surface; The method for erecting scaffolding in the foundation pit includes: using a lifting device to hoist the first complete scaffold until it is wedged into the gap of the radiating section, continuing to move the remaining complete scaffolds, and fixing the moved complete scaffolds in the foundation pit. By adopting the above technical solution, because the steel cable in the middle has a small lateral displacement during the tightening process, and the steel cable passes through the anchor plate and is anchored to the anchor, the column can avoid the misaligned steel cable moving along the length of the main cable by following the gap between the anchor plates. The columns and crossbars are pre-connected to form a whole frame. After the steel cable is anchored to the anchor, the whole frame is moved along the extension direction of the main cable until it is stuck in the gap of the steel cable in the radiating part. At this time, the whole frame is fixed, and the columns are fixed in the radiating part. This reduces the difficulty for construction workers to fix the scaffolding in the dense steel cable, which leads to a decrease in the overall structural stability of the whole frame. It is beneficial to improve the stability between the columns and crossbars, thereby improving the load-bearing capacity of the whole frame for the top cover formwork. At the same time, multiple whole frames are slid on the radiating part to fill the gaps in the radiating part, increasing the number of scaffolds at this position, thereby improving the load-bearing capacity of the scaffolding for the top cover formwork at this position, and further enhancing the stability of the top cover formwork at the top of the foundation pit.

[0011] Preferably, the lifting device includes a movable gantry frame; The method for erecting scaffolding in the foundation pit further includes: while using the movable gantry crane to move the entire scaffolding away from the anchor, the entire scaffolding is raised.

[0012] By adopting the above technical solution, since the main cable is set at an inclination, when the entire frame is moved along the main cable, the movable gantry slides horizontally while moving the entire frame vertically upward, so that the entire frame can move along the inclination main cable.

[0013] Preferably, the method of erecting a transverse support beam at the top of the foundation pit where steel cables are densely packed includes: using the movable gantry crane to hoist the crossbeam to directly above the converging part, and then connecting both ends of the support beam to the side wall of the foundation pit.

[0014] By adopting the above technical solution and using a movable gantry crane to hoist the support beam, construction workers only need to fix the support beam after hoisting it before they can start erecting scaffolding on the support beam, which reduces the labor costs of construction workers moving the support beam.

[0015] Preferably, the method of using a lifting device to move several of the entire frames in sequence includes: first anchoring all the steel cables to the anchor, and then starting to move the entire frame.

[0016] By adopting the above technical solution, if the entire frame is moved before all the steel cables are installed on the anchor, the subsequent steel cables need to pass through multiple frames at different locations when anchoring, which increases the difficulty of construction.

[0017] Preferably, several of the frames are placed vertically in the pit: fixing components are installed in the pit to temporarily fix several of the frames in the pit.

[0018] By adopting the above technical solution, since the construction cycle of steel cables is relatively long, the entire frame is manufactured first and placed in the foundation pit. Then, the steel cables can be passed through the entire frame one by one.

[0019] Preferably, the method for fixing the moved frames within the pit includes: when moving the frames to a predetermined position of the scattering section, first using ropes to temporarily fix the frames to the steel cables, and then removing the ropes after the frames are fixed.

[0020] By adopting the above technical solution, after the entire frame is moved to the scattering part, the construction personnel need to fix the entire frame. In order to reduce the risk of the entire frame sliding down the bottom of the inclined foundation pit during the fixing construction, the entire frame is temporarily fixed to the steel cable to facilitate the construction personnel to carry out the construction.

[0021] Preferably, the method of fixing the moved sets of frames in the pit further includes: after the scaffolding on the radiating section is erected, installing the uprights on the horizontal columns extending from the radiating section.

[0022] By adopting the above technical solution, since the entire frame is only equipped with columns in the middle position, and the top cover template is relatively heavy in the middle, installing columns on the horizontal columns extending from the main cable radiating section further enhances the overall load-bearing capacity of the frame and reduces the risk of the top cover collapsing.

[0023] In summary, this application has at least the following beneficial effects: 1. Construction workers insert the steel cables at the ends of the main cable into the corresponding anchor plates to anchor them to the anchor. Then, all the steel cables are gathered together to form the main cable. At this point, the part of the main cable end away from the front anchor surface is too dense to place the scaffolding columns. Therefore, a horizontal support beam is erected directly above the dense part of the main cable, and the scaffolding is erected on the support beam. The scaffolding columns do not need to pass through the dense part of the main cable to support the top cover formwork. This support method, without further construction on the main cable, uses the foundation pit and support beam as the foundation, and uses scaffolding to stably support the top cover formwork at the dense part of the main cable, reducing the risk of the top cover collapsing during construction and thus increasing the structural stability of the top cover.

[0024] 2. Because the steel cables in the radiating section are misaligned in the vertical direction, it is difficult for the scaffolding columns to pass directly through the radiating section as a whole. Therefore, multiple horizontal columns of the scaffolding are first inserted in the horizontal direction, and then the columns are inserted between two adjacent steel cables and connected to the horizontal columns to complete the scaffolding construction. By converting the horizontal columns, the columns that are difficult to place vertically are passed through the steel cables in the radiating section, so that the columns can exist stably in the radiating section and support the top cover of the foundation pit. Moreover, the main cable is located in the middle of the foundation pit. The columns inserted in the radiating section of the main cable support the top cover formwork in the middle position of the foundation pit, which can effectively improve the support of the scaffolding for the top cover formwork and reduce the risk of the top cover collapsing from the center during construction.

[0025] 3. Because the steel cable in the middle has a small lateral movement during the tightening process, and the cable passes through the anchor plate and is anchored to the anchor, the column can avoid the misaligned steel cable moving along the length of the main cable by following the gap between the anchor plates. The columns and crossbars are pre-connected to form a whole frame. After the steel cable is anchored to the anchor, the whole frame is moved along the extension direction of the main cable until it is stuck in the gap of the steel cable in the radiating part. At this time, the whole frame is fixed, and the columns are fixed in the radiating part. This reduces the difficulty for construction workers to fix the scaffolding in the dense steel cable, which would reduce the overall structural stability of the whole frame. It is beneficial to improve the stability between the columns and crossbars, thereby improving the load-bearing capacity of the whole frame for the top cover formwork. At the same time, multiple whole frames are slid on the radiating part to fill the gaps in the radiating part, increasing the number of scaffolds at this position, thereby increasing the load-bearing capacity of the scaffolding for the top cover formwork at this position, and further enhancing the stability of the top cover formwork at the top of the foundation pit. Attached Figure Description

[0026] Figure 1 This is a flowchart of the construction method of the suspension bridge front anchorage close to the embodiment of this application.

[0027] Figure 2 This is a side view of the front anchorage and main cable of the suspension bridge front anchorage close-fitting construction method according to an embodiment of this application.

[0028] Figure 3 This is a side view of the main cable scattering section and the cable convergence section in the suspension bridge front anchorage close-to-the-cabin construction method according to an embodiment of this application.

[0029] Figure 4 This is a top view of the main cable scattering section and the cable convergence section in the suspension bridge front anchorage close-to-the-cabin construction method according to an embodiment of this application.

[0030] Figure 5 This is a schematic diagram of the cable scattering arrangement in the suspension bridge front anchorage close-to-the-cabin construction method according to an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures: 1. Foundation pit; 2. Anchor; 3. Main cable; 31. Steel cable; 32. Spreading section; 33. Converging section; 4. Scaffold; 41. Horizontal column; 42. Vertical column; 43. Frame; 5. Support beam; 6. Top cover formwork; 7. Lifting equipment. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] This application discloses a method for constructing the front anchorage chamber of a suspension bridge using a close-proximity method. (Refer to...) Figure 1 The construction method of close proximity to the front anchorage of a suspension bridge includes: S10: Excavate the foundation pit 1 at the predetermined location and construct the anchor 2 at the bottom of the foundation pit 1 on the side away from the suspension bridge. Pour concrete into the inner wall of the foundation pit 1 for solidification. At the same time, pass the two ends of multiple steel cables 31 through the gantry of the suspension bridge and hoist them to the front anchor face of the anchor 2 at both ends of the suspension bridge.

[0034] S20: Pass the two ends of the multiple steel cables 31 through the anchor plates on the front anchor surfaces of the anchors 2 at both ends of the suspension bridge and anchor them to the anchors 2.

[0035] S30: Multiple steel cables 31 are joined together to form the main cable 3 of the suspension bridge.

[0036] S40: Erect scaffolding 4 inside the foundation pit 1, and erect a transverse support beam 5 on the top of the foundation pit 1 where the steel cables 31 are dense, and continue to erect scaffolding 4 based on the support beam 5.

[0037] S50: Install the top cover template 6, which is parallel to the ground, on the top of the scaffold 4.

[0038] S60: Place steel bars into the top cover formwork 6 and pour concrete until the concrete solidifies to seal the foundation pit 1 and form the front anchor chamber.

[0039] Reference Figure 2 and Figure 3 The main cable 3 in the front anchor chamber is located on the centerline of the length direction of the front anchor chamber. The main cable 3 includes a scattering part 32 near the front anchor surface and a converging part 33 away from the front anchor surface. Several steel cables 31 of the scattering part 32 are staggered in the height direction of the front anchor surface and are arranged in a straight line in the horizontal direction in the width direction. S41: After the horizontal column 41 of the scaffold 4 passes horizontally through the radiating part 32, install the upright column 42 of the scaffold 4 on the horizontal column 41. When the steel cable 31 of the radiating part 32 is encountered in the vertical direction, move the next upright column 42 horizontally to the gap between the two horizontally adjacent steel cables 31 and install it on the horizontal column 41. Continue to erect the horizontal column 41 and upright column 42 on the upright column 42 until the erection of the scaffold 4 is completed.

[0040] To increase the number of scaffolding columns 42 at the location of the main cable 3 and enhance the vertical load-bearing capacity of the scaffolding 4 on the top cover formwork 6, the construction workers first installed a horizontal support beam 5 directly above the converging section 33. Based on the support beam 5, the construction workers were able to erect the scaffolding 4 above the dense converging section 33, where the columns 42 were difficult to pass through, thus enhancing the load-bearing capacity of the top cover formwork 6 in the middle of the pit 1. At the same time, horizontal columns 41 were inserted horizontally within the radiating section 32, and columns 42 were installed on the horizontal columns 41. By setting the columns 42 in sections to avoid the longitudinal steel cables 31, the scaffolding 4 was erected within the radiating section 32 of the main cable 3. The scaffolding 4 at this location further enhanced the load-bearing capacity of the top cover formwork 6 in the middle of the pit 1.

[0041] Reference Figure 5 The column 42 is fixedly connected to the horizontal column 41 according to the gap between the anchor plates on the front anchor surface to form the frame 43, and the column 42 corresponds to the gap position between the steel cables 31 of the scattering part 32; refer to Figure 3 and Figure 4 The entire frame has 43 sets of multiple main cables 3 arranged in the direction of their extension.

[0042] S21: Place multiple frames 43 vertically in the pit 1, and then pass steel cables 31 through the frames 43 and the front anchor surface, so that the frames 43 can move within the steel cables 31.

[0043] The method of vertically placing multiple frames 43 in the pit 1 in S21 includes: installing fixing components in the pit 1, and temporarily fixing the frames 43 in the pit 1 using the fixing components; in this embodiment, the fixing component is a support rod, and fixing one end of the support rod to the frame 43 and placing the other end on the ground can temporarily fix the frame 43 on the ground.

[0044] S42: Use the lifting device 7 to lift the first frame 43 until the frame 43 is stuck in the gap of the scattering part 32, continue to move the remaining frames 43 and fix the moved frames 43 in the pit 1.

[0045] A column 42 is fixedly connected in the middle of the crossbeam, and the crossbeams 41 and columns 42 are connected to form a whole frame 43. The steel cable 31 is passed through the whole frame 43 and connected to the anchor, so that the whole frame 43 can have a certain amount of slippage within the steel cable 31. After the whole frame 43 is slipped, scaffolding 4 can continue to be erected on the columns 42 of the whole frame 43. This reduces the difficulty of construction when workers erect scaffolding 4 on the radiating part 32 due to the excessive density of steel cables 31, thereby reducing the number of scaffolding 4 and preventing structural instability of scaffolding 4. The increased number of scaffolding 4 at this location increases the load-bearing capacity of scaffolding 4 on the top cover.

[0046] Reference Figure 2The lifting device 7 includes a movable gantry frame. The method of erecting a transverse support beam 5 at the top of the foundation pit 1 where the steel cables 31 are dense in S40 also includes that the construction personnel first use the movable gantry frame to lift the support beam 5, and then fix the support beam 5 to the side wall of the foundation pit 1 directly above the converging part 33.

[0047] The method in S42 includes: using a movable gantry crane to move the entire frame 43 in a direction away from the anchor 2 while raising the entire frame 43, thereby moving the entire frame 43 in the extension direction of the inclined main cable 3.

[0048] Using a movable gantry crane makes it easier to lift the entire frame 43. The movable gantry crane is fixed to the entire frame 43 by setting multiple hooks, which can reduce the deformation of the entire frame 43 compared to a single hook point. At the same time, the movable gantry crane can be used to lift the support beam 5, reducing the labor cost of handling.

[0049] Reference Figure 3 and Figure 4 The method for fixing several frames 43 after movement into the pit 1 includes: when moving the frames 43 to the predetermined position of the scattering part 32, first use ropes to temporarily fix the frames 43 to the steel cable 31, and then remove the ropes after the fixing of the frames 43 is completed. This can reduce the risk of accidents caused by the frames 43 sliding on the inclined main cable 3 during the fixing construction.

[0050] The method after fixing the moved frames 43 in the pit 1 also includes: after the scaffolding 4 on the scattering part 32 is erected, columns 42 are installed on the horizontal columns 41 extending out of the scattering part 32, thereby reinforcing the horizontal columns 41 extending out of the scattering part 32 again, and at the same time extending the horizontal columns 41 of the frames 43 so that both ends are fixed to the side wall of the pit 1; making the structure of the frames 43 more stable.

[0051] The implementation principle of the suspension bridge front anchorage close-fitting construction method in this application embodiment is as follows: In the foundation pit 1, some columns 42 and horizontal columns 41 are fixed to form a whole frame 43. After the steel cable 31 of the main cable 3 passes through the whole frame 43, the construction of the main cable 3 is completed. First, a support beam 5 is erected above the convergence part 33, and scaffolding 4 is erected based on the support beam 5. Then, horizontal columns 41 and columns 42 are continued to be inserted in other parts of the radiating part 32, so as to build scaffolding 4 as much as possible on the entire main cable 3. Scaffolding 4 is erected in the foundation pit 1 except at the location of the main cable 3. Finally, the top cover template 6 is installed on the top of the scaffolding 4. By erecting scaffolding 4 in the foundation pit 1 in various ways, the top cover template 6 is supported, reducing the risk of the top cover template 6 collapsing.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for constructing a suspension bridge's front anchorage chamber using the close-proximity method, characterized in that... The construction method includes: Step 1: Excavate the foundation pit (1) of the front anchor chamber at the predetermined location and construct the anchor (2). Hoist the two ends of several steel cables (31) to the front anchor face of the anchor (2) at both ends of the suspension bridge. Step 2: Pass the two ends of several steel cables (31) through the front anchor plate of the anchors (2) at both ends of the suspension bridge and anchor them to the anchors (2); Step 3: Join several steel cables (31) together to form the main cable (3) of the suspension bridge; Step 4: Erect scaffolding (4) in the foundation pit (1), and erect a horizontal support beam (5) on the top of the foundation pit (1) where the steel cables (31) are dense, and continue to erect scaffolding (4) based on the support beam (5); Step 5: Install the top cover template (6) on the top of the scaffolding (4); Step 6: Pour concrete into the top cover template (6) to form the top cover closed foundation pit (1) and form the front anchor chamber; The main cable (3) in the front anchor chamber includes a scattering part (32) near the front anchor surface and a gathering part (33) away from the front anchor surface; a plurality of steel cables (31) of the scattering part (32) are staggered in the height direction of the front anchor surface and are arranged in a straight line in the horizontal direction in the width direction; The column (42) is fixedly connected to the horizontal column (41) according to the gap between the anchor plates on the front anchor surface to form a whole frame (43), and the column (42) corresponds to the gap between the steel cables (31) at the center of the scattering part (32); the whole frame (43) is provided with a number of them and arranged in a direction away from the front anchor surface to close to the front anchor surface; The method of step two includes: placing several of the frames (43) vertically in the foundation pit (1), and then passing the steel cable (31) through the frames (43) and the front anchor surface; The method of erecting scaffolding (4) in the foundation pit (1) includes: using a lifting device (7) to lift the first complete frame (43) until the complete frame (43) is stuck in the gap of the scattering part (32), continuing to move the remaining complete frames (43) and fixing the moved complete frames (43) in the foundation pit (1); The lifting device (7) includes a movable gantry frame; The method of erecting scaffolding (4) in the foundation pit (1) further includes: using the movable gantry crane to move the whole frame (43) in a direction away from the anchor (2) while raising the whole frame (43); The method of erecting a transverse support beam (5) on the top of the foundation pit (1) where the steel cables (31) are dense includes: using the movable gantry to hoist the whole frame (43) to the top of the converging part (33), and then connecting the two ends of the support beam (5) to the side wall of the foundation pit (1). Several of the frames (43) are placed vertically in the pit (1): a fixing component is installed in the pit (1) to temporarily fix several of the frames (43) in the pit (1); The method of fixing the moved frames (43) in the pit (1) further includes: after the scaffolding (4) on the scattering part (32) is erected, the uprights (42) are installed on the horizontal columns (41) extending from the scattering part (32) until the pit (1) is filled with the scaffolding (4).

2. The construction method for the anchorage chamber of a suspension bridge by close proximity according to claim 1, characterized in that, The method for erecting scaffolding (4) in the foundation pit (1) includes: passing the horizontal column (41) of the scaffolding (4) through the radiating part (32), installing the upright column (42) of the scaffolding (4) on the horizontal column (41), when encountering the steel cable (31) of the radiating part (32) in the vertical direction, moving the upright column (42) horizontally to the gap between the adjacent steel cables (31) and installing it on the horizontal column (41), and continuing to erect the horizontal column (41) and the upright column (42) on the upright column (42) until the erection of the scaffolding (4) is completed.

3. The construction method for the anchorage chamber of a suspension bridge according to claim 1, characterized in that, The method of using a lifting device (7) to move several of the frames (43) in sequence includes: first anchoring all the steel cables (31) to the anchor (2), and then starting to move the frames (43).

4. The construction method for the anchorage chamber of a suspension bridge by close proximity according to claim 2, characterized in that, The method for fixing the moved frames (43) in the pit (1) includes: when moving the frames (43) to a predetermined position of the scattering part (32), first use ropes to temporarily fix the frames (43) to the steel cable (31), and then remove the ropes after the frames (43) are fixed.

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