Adjustable building cantilever supporting frame

Abstract

The invention relates to the technical field of cantilever supporting frames, in particular to an adjustable building cantilever supporting frame. According to the technical scheme, the device comprises a plurality of sets of first supports pre-buried in a wall and a plurality of second supports located below the first supports, and further comprises supporting rods rotationally installed on the first supports and a plurality of sets of inclined supporting rod pieces, and each inclined supporting rod piece comprises a sleeve rotationally connected with the corresponding second support and a pull rod slidably installed in the sleeve in a sealed mode; a positioning cylinder is fixedly installed on the sleeve, a plugging plate is connected into the positioning cylinder in a sealed and sliding mode, the position, located on one side of the plugging plate, of the positioning cylinder is communicated with the sleeve through a conveying pipe, and a first valve is fixedly installed on the conveying pipe. The single air pump controls synchronous pre-tightening of multiple rods, uniform distribution of loads is ensured, concrete crushing or rod piece failure caused by local overload is avoided, compared with a traditional hydraulic pushing device, field equipment requirements are reduced by%, operators only need to control opening and closing of the valves, and the installation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cantilever support frame technology, and in particular to an adjustable building cantilever support frame. Background Technology

[0002] In the construction of cantilevered concrete structures in high-rise buildings and large public buildings, such as commercial complexes and stadiums, traditional techniques mainly rely on full-span scaffolding or high-support formwork systems. Full-span scaffolding needs to be erected from the ground to the height, which consumes a large amount of steel and prolongs the construction period. It is difficult to implement in narrow spaces. Existing prefabricated solutions rely on cable stays to fix the cantilever beams, but due to the height of the upper building, when the cantilever length is greater than 4m, there is insufficient vertical installation space for the cable stays, resulting in insufficient tension and a significant increase in the risk of swaying.

[0003] By using pre-embedded supports and modular support units, construction risks and costs can be significantly reduced. This approach is suitable for complex scenarios such as high-intensity seismic zones and irregular facades. A single diagonal brace must bear the entire cantilever load, which can easily lead to localized stress concentration and cause the concrete in the pre-embedded area to collapse. By setting multiple diagonal braces, the load is distributed and transferred to multiple second supports, significantly reducing single-point stress and avoiding localized damage. Multiple diagonal braces form a spatial truss system that mutually constrains horizontal displacement and resists overturning moments caused by wind loads or construction eccentric loads. Furthermore, the vertically arranged second corbels provide multi-point anchorage, enhancing the overall stability of the floor slab edges.

[0004] However, when the initial tension of each member is inconsistent, some members may not be under force, resulting in a "virtual member" phenomenon. This causes the actual load to be concentrated on a few members. Therefore, a hydraulic synchronous jacking device needs to be used during installation to ensure that all diagonal bracing members are simultaneously pressed against the bracket hinge point. However, this installation method requires the installation of multiple hydraulic jacking devices, which increases the installation steps and is not conducive to improving work efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing an adjustable cantilever support frame for building construction that simultaneously sets multiple diagonal bracing members and ensures that the diagonal bracing members can be evenly stressed, thus preventing some members from being unstressed.

[0006] The technical solution of this invention: An adjustable cantilever support frame for building construction, comprising multiple sets of first supports embedded in the wall and multiple second supports located below the first supports, and further comprising: Rotate the support rod mounted on the first support; Multiple sets of diagonal bracing members are provided, each diagonal bracing member corresponding to and rotatably connected to the second support. The other end of each diagonal bracing member is rotatably connected to the support rod. Each diagonal bracing member includes a sleeve rotatably connected to the second support and a tie rod slidably and sealed inside the sleeve. A positioning cylinder is fixedly installed on the sleeve. A sealing plate is slidably connected inside the positioning cylinder. The positioning cylinder is located on one side of the sealing plate and communicates with the sleeve through a delivery pipe. A first valve is fixedly installed on the delivery pipe. An air inlet pipe is provided at the other end of the positioning cylinder located on the sealing plate. All of the aforementioned air inlet pipes are connected to an external air pump device.

[0007] Optionally, one end of the pull rod is rotatably connected to the support rod via a connecting block, and the other end of the pull rod is fixedly installed with a first sliding block, on which a plurality of first sealing rings are fixedly installed.

[0008] Optionally, the sealing plate includes a second sliding block slidably installed inside the positioning cylinder, and a plurality of second sealing rings are fixedly installed on the second sliding block.

[0009] Optionally, the sleeve and the side connected to the positioning cylinder, the positioning cylinder and the side connected to the sleeve, the delivery pipe and the first valve are all filled with hydraulic medium, which is a liquid that cannot be compressed under working conditions.

[0010] Optionally, a one-way valve is fixedly installed on the air inlet pipe, which allows gas to enter the positioning cylinder in one direction, and a second valve is fixedly installed on the positioning cylinder.

[0011] Optionally, a pressure relief detection component is fixedly installed on the positioning cylinder, and the pressure relief detection component detects whether the hydraulic medium inside the sleeve and the positioning cylinder is leaking.

[0012] Optionally, the pressure relief detection component includes a circular tube fixedly installed on the positioning cylinder, a piston slidably installed inside the circular tube, a limiting protrusion at one end of the circular tube, a traction rod fixedly installed on the piston, and a spring fixedly installed between the traction rod and the circular tube.

[0013] Optionally, it also includes a positioning mechanism that is fixedly installed on the first support and fixedly connected to the support rod, the positioning mechanism fixing the support rod at any angle within the adjustment range.

[0014] Optionally, the positioning mechanism includes a mounting base fixedly installed on the second support and a limiting box fixedly installed on the mounting base. A rotating shaft is rotatably installed inside the limiting box, a first sealing body is fixedly installed on the rotating shaft, and a second sealing body is fixedly installed inside the limiting box. The first and second sealing bodies divide the limiting box into two liquid chambers, each of which is filled with hydraulic medium. A pipe connecting the two liquid chambers is fixedly installed on the limiting box, and a third valve is fixedly installed on the pipe. A connecting shaft is fixedly installed on the support rod. The connecting shaft is rotatably connected to the second support. Both ends of the connecting shaft are provided with a first flange. One end of the rotating shaft extends to the outside of the limiting box and is fixedly installed with a second flange. The first flange and the second flange are detachably connected. A sealing ring is fixedly installed on the limiting box.

[0015] Optionally, a connecting seat is fixedly installed on both the sleeve and the tie rod, and a reinforcing rod is fixedly installed between two adjacent connecting seats; Multiple I-beams are fixedly installed on the multiple support rods, and a support platform is fixedly installed on the I-beams.

[0016] In summary, this application includes at least one of the following beneficial technical effects: A single air pump controls multiple rods for synchronous pre-tensioning, ensuring uniform load distribution and preventing concrete crushing or rod failure caused by local overload. Compared to traditional hydraulic jacking devices, it reduces on-site equipment requirements by 90%, requiring operators only to control valve opening and closing, increasing installation efficiency by over 50%. The hydraulic locking mechanism provides constant support force, the adjustable support rod angle accommodates construction errors, reduces investment in dedicated hydraulic equipment, and the pre-tensioning system is reusable, resulting in a 30% reduction in overall costs. Attached Figure Description

[0017] Figure 1 Schematic diagram of an adjustable cantilever support frame for building construction Figure 1 ; Figure 2 Schematic diagram of an adjustable cantilever support frame for building construction Figure 2 ; Figure 3 Schematic diagram of the positional distribution of the diagonal bracing members Figure 1 ; Figure 4 Schematic diagram of the positional distribution of the diagonal bracing members Figure 2 ; Figure 5 This is a connection diagram of the positioning mechanism; Figure 6 Schematic diagram of the positioning mechanism Figure 1 ; Figure 7 Schematic diagram of the positioning mechanism Figure 2 ; Figure 8 Schematic diagram of the diagonal brace member Figure 1 ; Figure 9 Schematic diagram of the diagonal brace member Figure 2 ; Figure 10 This is a schematic diagram of the pressure relief detection component; Figure 11 for Figure 10 A magnified view of a portion of point A in the middle.

[0018] Reference numerals: 1. First support; 11. Second support; 2. Support rod; 21. Connecting shaft; 22. First flange; 3. Positioning mechanism; 31. Mounting seat; 32. Limiting box; 33. Rotating shaft; 34. First sealing body; 35. Second sealing body; 36. Liquid chamber; 37. Pipeline; 38. Third valve; 39. Second flange; 310. Sealing ring; 4. Diagonal brace; 41. Sleeve; 42. Tie rod; 43. Connecting block; 44. First sliding block 45. Moving block; 46. First sealing ring; 47. Positioning cylinder; 48. Second sliding block; 49. Second sealing ring; 40. Conveying pipe; 410. First valve; 411. Air inlet pipe; 412. One-way valve; 413. Second valve; 414. Exhaust port; 5. Pressure relief detection assembly; 51. Round pipe; 52. Piston; 53. Limiting protrusion; 54. Traction rod; 55. Spring; 6. Connecting seat; 61. Reinforcing rod; 7. I-beam; 8. Support platform. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1 to 4 As shown, the present invention proposes an adjustable cantilever support frame for building construction, including multiple sets of first supports 1 embedded in the wall and multiple second supports 11 located below the first supports 1. It also includes a support rod 2 rotatably installed on the first supports 1. The cantilever is supported by the support rod 2. By rotating the support rod 2, the angle of the support rod 2 can be adjusted according to construction needs. When the installation position of the first supports 1 deviates, the position of the support rod 2 can be flexibly adjusted so that the support rod 2 moves to a set angle. A connecting shaft 21 is fixedly installed on the support rod 2. The connecting shaft 21 is rotatably connected to the second supports 11. Both ends of the connecting shaft 21 are provided with first flanges 22. The rotatable connection between the support rod 2 and the first supports 1 is realized through the connecting shaft 21.

[0021] like Figures 1 to 5 , Figure 8 , Figure 9As shown, the cantilever support frame in this embodiment also includes multiple sets of diagonal bracing members 4. The diagonal bracing members 4 correspond one-to-one with the second support 11 and are rotatably connected. The other end of the diagonal bracing member 4 is rotatably connected to the support rod 2. When the length of the diagonal bracing member 4 cannot be adjusted, the diagonal bracing member 4 will support the support rod 2 and transmit the pressure on the support rod 2 to the second support 11. The diagonal bracing member 4 includes a sleeve 41 rotatably connected to the second support 11 and a tie rod 42 slidably and sealed inside the sleeve 41. One end of the tie rod 42 is rotatably connected to the support rod 2 through a connecting block 43. The total length of the sleeve 41 and the tie rod 42 can be adjusted by sliding the tie rod 42. The length of the diagonal brace 4 can be adjusted appropriately according to the installation position to improve the versatility of the diagonal brace 4 and ensure that the support rod 2 can be adjusted to a specified angle. A positioning cylinder 46 is fixedly installed on the sleeve 41. A sealing plate is slidably connected inside the positioning cylinder 46. The positioning cylinder 46 is located on one side of the sealing plate and is connected to the sleeve 41 through a conveying pipe 49. A first valve 410 is fixedly installed on the conveying pipe 49. An air inlet pipe 411 is provided at the other end of the positioning cylinder 46 located on the sealing plate. High-pressure gas can be input into the positioning cylinder 46 through the air inlet pipe 411 to pressurize the sealing plate. The sealing plate under pressure will move along the positioning cylinder 46.

[0022] One end of the sleeve 41 is provided with an exhaust hole 414. When the pull rod 42 moves, gas can enter or exit through the exhaust hole 414, reducing the resistance when the pull rod 42 moves.

[0023] It should be noted that the sleeve 41 (the side connected to the positioning cylinder 46), the positioning cylinder 46 (the side connected to the sleeve 41), the delivery pipe 49, and the first valve 410 are all filled with hydraulic medium. This hydraulic medium is a liquid that cannot be compressed under working conditions. When the sealing plate moves, it will compress the hydraulic medium, forcing the hydraulic medium inside the positioning cylinder 46 into the sleeve 41. This will cause the pull rod 42 to move, applying force to the support rod 2. This allows the diagonal brace 4 to apply a preload to the support rod 2, ensuring that the diagonal brace 4 can withstand the pressure of the support rod 2. To prevent the phenomenon of "virtual rods", and by controlling the opening and closing of the first valve 410, it is possible to control whether the hydraulic medium inside the sleeve 41 and the positioning cylinder 46 can be exchanged. When the first valve 410 is closed, the pull rod 42 will tend to move downward when under pressure. At this time, the downward-moving pull rod 42 needs to squeeze the hydraulic medium into the positioning cylinder 46. However, due to the closure of the first valve 410 and the characteristic that the hydraulic medium cannot be compressed, the pull rod 42 cannot move downward. Thus, the pull rod 42 can maintain a constant position when under pressure, ensuring the stability of the support rod 2 by the diagonal brace 4.

[0024] Furthermore, multiple air inlet pipes 411 are connected to external air pumps, which simultaneously deliver high-pressure gas to the interiors of multiple positioning cylinders 46. This ensures that the air pressure inside each positioning cylinder 46 is equal, thereby ensuring that the preload applied by multiple tie rods 42 to the support rod 2 is equal. This, in turn, keeps the forces on multiple diagonal bracing members 4 equal. Thus, multiple diagonal bracing members 4 can be preloaded using only a single air pump device, eliminating the need for multiple hydraulic rods. This reduces test tube costs and difficulty, and effectively improves construction efficiency.

[0025] Furthermore, a first sliding block 44 is fixedly installed at the other end of the pull rod 42. Multiple first sealing rings 45 are fixedly installed on the first sliding block 44. The first sealing rings 45 can seal the tiny gap between the first sliding block 44 and the sleeve 41. The sealing plate includes a second sliding block 47 that is slidably installed inside the positioning cylinder 46. Multiple second sealing rings 48 are fixedly installed on the second sliding block 47. The second sealing rings 48 can seal the gap between the positioning cylinder 46 and the second sliding block 47 to prevent the hydraulic medium from flowing out.

[0026] It is worth noting that a one-way valve 412 is fixedly installed on the air inlet pipe 411. The one-way valve 412 allows gas to enter the positioning cylinder 46 in one direction. A second valve 413 is fixedly installed on the positioning cylinder 46. When the gas enters the positioning cylinder 46 and the air pipe is pulled out, the gas will not be able to escape under the action of the one-way valve 412, ensuring that the positioning cylinder 46 is in a high-pressure state. At this time, pressure can be continuously applied to the pull rod 42, or the first valve 410 can be closed to position the pull rod 42. When it is necessary to release the pull rod 42, the first valve 410 and the second valve 413 can be opened to move the pull rod 42 down, thereby canceling the support of the support rod 2 and facilitating disassembly.

[0027] like Figures 10 to 11As shown, in this embodiment, a pressure relief detection component 5 is fixedly installed on the positioning cylinder 46. The pressure relief detection component 5 detects whether the hydraulic medium inside the sleeve 41 and the positioning cylinder 46 leaks. If the seal inside the positioning cylinder 46 or the sleeve 41 fails, causing the hydraulic medium to flow out, it will be unable to bear the pressure on the support rod 2, resulting in support failure. The pressure relief detection component 5 includes a circular tube 51 fixedly installed on the positioning cylinder 46, a piston 52 slidably installed inside the circular tube 51, a limiting protrusion 53 at one end of the circular tube 51, a traction rod 54 fixedly installed on the piston 52, and a spring 55 fixedly installed between the traction rod 54 and the circular tube 51. Under the action of the air pressure inside the positioning cylinder 46, the piston 52 will move outward and resist... The limiting protrusion 53 compresses the spring 55. During testing, the first valve 410 is opened. If the seal inside the sleeve 41 fails, the hydraulic medium will pass over the first sliding block 44 under pressure. At this time, the gas inside the positioning cylinder 46 will enter the sleeve 41, reducing the gas pressure inside the positioning cylinder 46. Under the action of the spring 55, the piston 52 will move into the positioning cylinder 46. The seal failure can be determined by opening the first valve 410 and observing whether the position of the piston 52 changes. When the first valve 410 is opened, the piston 52 moves into the positioning cylinder 46, indicating that the seal inside the positioning cylinder 46 has failed.

[0028] like Figures 5 to 7 As shown, the cantilever support frame in this embodiment also includes a positioning mechanism 3 fixedly installed on the first support 1 and fixedly connected to the support rod 2. The positioning mechanism 3 fixes the support rod 2 at any angle within the adjustment range. When pressure is applied to the tie rod 42 to apply preload to the support rod 2, the support rod 2 needs to be positioned to prevent the support rod 2 from rotating after being compressed. The positioning mechanism 3 can be used to position the support rod 2.

[0029] Furthermore, the positioning mechanism 3 includes a mounting base 31 fixedly installed on the second support 11 and a limiting box 32 fixedly installed on the mounting base 31. A rotating shaft 33 is rotatably installed inside the limiting box 32, and a first sealing body 34 is fixedly installed on the rotating shaft 33. A second sealing body 35 is fixedly installed inside the limiting box 32. The first sealing body 34 and the second sealing body 35 divide the limiting box 32 into two liquid chambers 36, each of which is filled with hydraulic medium. A device is fixedly installed on the limiting box 32 to separate the two liquid chambers 36. The pipe 37 is connected to the 6th pipe. A third valve 38 is fixedly installed on the pipe 37. When the third valve 38 is open, the hydraulic medium inside the two liquid chambers 36 can flow to each other. When the rotating shaft 33 rotates, it will drive the first sealing body 34 to rotate, which will squeeze the space of one of the liquid chambers 36. If the third valve 38 is closed, the rotating shaft 33 will not be able to move. Therefore, by controlling the opening and closing state of the third valve 38, the rotation of the rotating shaft 33 can be controlled.

[0030] One end of the rotating shaft 33 extends to the outside of the limiting box 32 and is fixedly installed with a second flange 39. The first flange 22 and the second flange 39 are detachably connected, thereby fixing the rotating shaft 33 to the support rod 2. When the rotating shaft 33 cannot rotate, the support rod 2 cannot rotate. A sealing ring 310 is fixedly installed on the limiting box 32, which can prevent the hydraulic medium inside the limiting box 32 from flowing out.

[0031] like Figures 1 to 3 As shown, in this embodiment, a connecting seat 6 is fixedly installed on both the sleeve 41 and the tie rod 42. A reinforcing rod 61 is fixedly installed between two adjacent connecting seats 6. The reinforcing rod 61 can ensure the integrity between multiple tie rods 42. Multiple I-beams 7 are fixedly installed on multiple support rods 2. A support platform 8 is fixedly installed on the I-beams 7. The support platform 8 supports the cantilever, and the I-beams 7 make the multiple support rods 2 bear pressure evenly.

[0032] In this embodiment, based on a pneumatic-hydraulic linkage adjustment system, the synchronous tensioning and locking of multiple diagonal bracing members is achieved by controlling the fluid pressure. An external air pump injects high-pressure gas into each positioning cylinder 46 through the air inlet pipe 411, which pushes the second sliding block 47 to move. The second sliding block 47 squeezes the hydraulic medium in the positioning cylinder and transmits it to the sleeve 41 chamber through the delivery pipe 49. The hydraulic pressure pushes the first sliding block 44, causing the pull rod 42 to extend along the sleeve, push the support rod 2 and apply pre-tightening force. A single air pump is connected to all air inlet pipes at the same time to ensure that the air pressure in each positioning cylinder 46 is consistent, thereby achieving synchronous and uniform force on multiple diagonal bracing members. After closing the first valve 410, the hydraulic circuit is closed, and the position of the pull rod is locked by utilizing the incompressible property of the liquid. Closing the third valve 38 can simultaneously lock the rotating shaft 33 of the positioning mechanism 3 and fix the angle of the support rod. The pressure relief detection component 5 detects hydraulic leakage by the displacement of piston 52, and the return of spring 55 triggers a visual alarm.

[0033] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An adjustable cantilever support frame for building construction, comprising multiple sets of first supports (1) pre-embedded in the wall and multiple second supports (11) located below the first supports (1), characterized in that, Also includes: Rotate the support rod (2) mounted on the first support (1); Multiple sets of diagonal bracing members (4), each diagonal bracing member (4) corresponds to and is rotatably connected to the second support (11). The other end of each diagonal bracing member (4) is rotatably connected to the support rod (2). Each diagonal bracing member (4) includes a sleeve (41) rotatably connected to the second support (11) and a pull rod (42) slidably and sealed inside the sleeve (41). A positioning cylinder (46) is fixedly installed on the sleeve (41). A sealing plate is slidably connected inside the positioning cylinder (46). The positioning cylinder (46) is located on one side of the sealing plate and is connected to the sleeve (41) through a conveying pipe (49). A first valve (410) is fixedly installed on the conveying pipe (49). An air inlet pipe (411) is provided at the other end of the positioning cylinder (46) located on the sealing plate. Each of the aforementioned air inlet pipes (411) is connected to an external air pump device.

2. The adjustable cantilever support frame for building construction according to claim 1, characterized in that, One end of the pull rod (42) is rotatably connected to the support rod (2) via a connecting block (43), and the other end of the pull rod (42) is fixedly installed with a first sliding block (44), and a plurality of first sealing rings (45) are fixedly installed on the first sliding block (44).

3. An adjustable cantilever support frame for building construction according to claim 2, characterized in that, The sealing plate includes a second sliding block (47) that is slidably installed inside the positioning cylinder (46), and a plurality of second sealing rings (48) are fixedly installed on the second sliding block (47).

4. An adjustable cantilever support frame for building construction according to claim 3, characterized in that, The sleeve (41) is filled with hydraulic medium on one side connected to the positioning cylinder (46), the positioning cylinder (46) is filled with hydraulic medium on one side connected to the sleeve (41), the delivery pipe (49) and the first valve (410). The hydraulic medium is a liquid that cannot be compressed under working conditions.

5. An adjustable cantilever support frame for building construction according to claim 4, characterized in that, A one-way valve (412) is fixedly installed on the air inlet pipe (411). The one-way valve (412) allows gas to enter the positioning cylinder (46) in one direction. A second valve (413) is fixedly installed on the positioning cylinder (46).

6. An adjustable cantilever support frame for building construction according to claim 5, characterized in that, A pressure relief detection component (5) is fixedly installed on the positioning cylinder (46). The pressure relief detection component (5) detects whether the hydraulic medium inside the sleeve (41) and the positioning cylinder (46) is leaking.

7. An adjustable cantilever support frame for building construction according to claim 1, characterized in that, The pressure relief detection component (5) includes a round tube (51) fixedly installed on the positioning cylinder (46), a piston (52) slidably installed inside the round tube (51), a limiting protrusion (53) provided at one end of the round tube (51), a traction rod (54) fixedly installed on the piston (52), and a spring (55) fixedly installed between the traction rod (54) and the round tube (51).

8. An adjustable cantilever support frame for building construction according to claim 7, characterized in that, It also includes a positioning mechanism (3) that is fixedly installed on the first support (1) and fixedly connected to the support rod (2), wherein the positioning mechanism (3) fixes the support rod (2) at any angle within the adjustment range.

9. An adjustable cantilever support frame for building construction according to claim 8, characterized in that, The positioning mechanism (3) includes a mounting base (31) fixedly installed on the second support (11) and a limiting box (32) fixedly installed on the mounting base (31). A rotating shaft (33) is rotatably installed inside the limiting box (32). A first sealing body (34) is fixedly installed on the rotating shaft (33). A second sealing body (35) is fixedly installed inside the limiting box (32). The first sealing body (34) and the second sealing body (35) divide the limiting box (32) into two liquid chambers (36). Both liquid chambers (36) are filled with hydraulic medium. A pipe (37) connecting the two liquid chambers (36) is fixedly installed on the limiting box (32). A third valve (38) is fixedly installed on the pipe (37). A connecting shaft (21) is fixedly installed on the support rod (2). The connecting shaft (21) is rotatably connected to the second support (11). Both ends of the connecting shaft (21) are provided with a first flange (22). One end of the rotating shaft (33) extends to the outside of the limiting box (32) and is fixedly installed with a second flange (39). The first flange (22) and the second flange (39) are detachably connected. A sealing ring (310) is fixedly installed on the limiting box (32).

10. An adjustable cantilever support frame for building construction according to claim 9, characterized in that, A connecting seat (6) is fixedly installed on both the sleeve (41) and the pull rod (42), and a reinforcing rod (61) is fixedly installed between two adjacent connecting seats (6). Multiple I-beams (7) are fixedly installed on the multiple support rods (2), and a support platform (8) is fixedly installed on the I-beams (7).

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