Shield tunnel annular rigid support assembling auxiliary trolley system and using method

Abstract

The invention provides a shield tunnel annular rigid support assembling auxiliary trolley system and a using method, and relates to the technical field of tunnel construction. The device comprises a trolley; the vertical mounting mechanism is mounted on the trolley and corresponds to the top and the bottom of the tunnel, the top of the vertical mounting mechanism is detachably connected with an upper ring support, and the bottom of the vertical mounting mechanism is detachably connected with a lower ring support; and the two sets of working platforms are installed on the two sides of the trolley correspondingly and limited on the trolley. The installation difficulty of the whole-ring support can be reduced, the installation efficiency can be improved, the workload and safety of workers can be reduced, the whole-ring support after assembly can enhance the overall rigidity of the tunnel lining, and the environmental influence is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a shield tunnel annular rigid support assembly auxiliary trolley system and a use method thereof. Background Art

[0002] In densely populated urban areas where space is at a premium, shield tunnels often face challenges from surrounding new construction. Adjacent construction activities can sometimes cause deformation in the shield tunnel structure, posing a potential threat to its safety. Therefore, for shield tunnels still under construction, appropriate reinforcement measures, particularly the addition of internal support structures to enhance stability, are crucial. In practice, the efficient and safe installation of these support structures within the tunnel has become a matter of meticulous consideration.

[0003] Therefore, there is an urgent need for a shield tunnel ring rigid support assembly auxiliary trolley system and usage method that can reduce the installation difficulty of the entire ring support, speed up the installation efficiency, and help reduce the workload of workers and ensure safety. Summary of the Invention

[0004] The present invention aims to provide a shield tunnel annular rigid support assembly auxiliary trolley system and method for use, addressing the existing technical problem of efficiently and safely installing these support structures within tunnels. The various technical effects achieved by the preferred technical solution among the various technical solutions provided by the present invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: The present invention provides a shield tunnel annular rigid support assembly auxiliary trolley system, comprising: Trolley; A vertical mounting mechanism, the vertical mounting mechanism being mounted on the trolley and disposed corresponding to the top and bottom of the tunnel, the top of the vertical mounting mechanism being detachably connected to the upper ring support, and the bottom of the vertical mounting mechanism being detachably connected to the lower ring support; Working platforms, two groups of working platforms are respectively installed on both sides of the trolley and are limited on the trolley.

[0006] Preferably, the vertical mounting mechanism includes: An upper hydraulic cylinder and a lower hydraulic cylinder are respectively vertically mounted on the trolley, a top telescopic end of the upper hydraulic cylinder is detachably connected to the upper ring support, and a bottom telescopic end of the lower hydraulic cylinder is detachably connected to the lower ring support.

[0007] Preferably, the vertical installation mechanism further includes: Connectors, the top telescopic end of the upper hydraulic cylinder and the bottom telescopic end of the lower hydraulic cylinder are respectively fixedly connected with the connectors, and the upper ring support and the lower ring support are respectively detachably connected to the two groups of connectors.

[0008] Preferably, the vertical installation mechanism further includes: Lateral baffles: a plurality of lateral baffles are symmetrically fixedly connected to both sides of the connector, and the upper ring support and the lower ring support are respectively adapted between the symmetrical plurality of lateral baffles.

[0009] Preferably, the vertical installation mechanism further includes: First connecting holes, a plurality of first connecting holes are respectively formed on the upper ring support and the lower ring support; Second connection holes: a plurality of second connection holes are provided on the connector, the first connection holes and the second connection holes are provided correspondingly, and the corresponding first connection holes and the second connection holes are connected by bolts.

[0010] Preferably, it also includes: Steps, a plurality of steps are installed on the trolley and are located on both sides of the upper hydraulic cylinder.

[0011] Preferably, it also includes: A latch, wherein the first side of the working platform is rotatably connected to the side wall of the vehicle body, and the latch is installed between the second side of the working platform and the side wall of the vehicle body; A connecting rod is installed between the trolley and the unfolded working platform.

[0012] Preferably, it also includes: A paved road surface is installed at the bottom of the tunnel.

[0013] A method for using a shield tunnel annular rigid support assembly auxiliary trolley system, which is applied to the shield tunnel annular rigid support assembly auxiliary trolley system described above, comprises the following steps: Step 1: Use handling and lifting equipment to hoist the upper ring support to the top of the vertical installation mechanism and connect it, hoist the lower ring support to the bottom of the vertical installation mechanism and connect it, and push the trolley to the installation position; Step 2: After reaching the predetermined installation position, the vertical installation mechanism is activated and extended, and the upper ring support is attached to the top wall of the tunnel, and the lower ring support is attached to the bottom of the tunnel; Step 3: unfold the working platform on the trolley, manually carry the left ring support and the right ring support to the predetermined installation position, and connect them to the upper ring support and the lower ring support with bolts; Step 4: After the upper ring support, left ring support, right ring support and lower ring support are installed, a complete ring support is formed. Disassemble the connection between the upper ring support, lower ring support and the vertical installation mechanism, start the vertical installation mechanism and shorten it, fold the working platform, and push out the trolley.

[0014] Preferably, in step three, the two ends of the upper ring support, the left ring support, the right ring support and the lower ring support are respectively fixedly connected with connecting plates, and the connecting plates on the upper ring support, the left ring support and the lower ring support, as well as the connecting plates on the upper ring support, the right ring support and the lower ring support are connected by bolts.

[0015] In the technical solution provided by the present invention, the upper ring support and the lower ring support installed on the vertical installation mechanism are transported to the designated installation position by using a trolley; the main function of the vertical installation mechanism is to fit the upper ring support and the lower ring support to the accurate position in the tunnel; the main function of the working platform is to provide an operating platform to facilitate manual installation of the left ring support and the right ring support between the upper ring support and the lower ring support to form a full ring support, while also facilitating disassembly. Overall, the present application can reduce the installation difficulty of the full ring support, speed up installation efficiency, and help reduce the workload and safety of workers. After assembly, the full ring support can enhance the overall rigidity of the tunnel lining and reduce environmental impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is the trolley, vertical mounting mechanism and working platform 13 of the present invention; Figure 2 This is a schematic diagram of the whole ring support of the present invention; Figure 3 This is a schematic diagram of the left ring support and connecting plate of the present invention; Figure 4 Schematic diagram of the lower ring support and the first connecting hole of the present invention; Figure 5 This is a schematic diagram of the working platform of the present invention in an expanded state; Figure 6 This is a shortened schematic diagram of the upper hydraulic cylinder and the lower hydraulic cylinder of the present invention; Figure 7 It is a schematic diagram of the extension of the upper hydraulic cylinder and the lower hydraulic cylinder of the present invention; Figure 8It is a schematic diagram of the connection of the upper ring support, the left ring support, the right ring support, and the lower ring support of the present invention; Figure 9 It is a schematic diagram of the upper hydraulic cylinder and the lower hydraulic cylinder of the present invention being separated from the upper ring support and the lower ring support.

[0018] In the figure, 1-upper ring support; 2-left ring support; 3-right ring support; 4-lower ring support; 5-connecting plate; 6-first connecting hole; 7-upper hydraulic cylinder; 8-connector; 9-lateral baffle; 10-second connecting hole; 11-step; 12-latch; 13-working platform; 14-lower hydraulic cylinder; 15-paved road surface; 16-wheel; 17-vehicle side wall; 18-connecting rod. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0020] refer to Figure 1-9 A specific embodiment of the present invention provides a shield tunnel annular rigid support assembly auxiliary trolley system, comprising: Trolley; A vertical mounting mechanism is mounted on the trolley and is disposed correspondingly to the top and bottom of the tunnel. The top of the vertical mounting mechanism is detachably connected to the upper ring support 1, and the bottom of the vertical mounting mechanism is detachably connected to the lower ring support 4; The working platforms 13 are mounted on both sides of the trolley and are positioned on the trolley.

[0021] In the adjacent construction activities, the shield tunnel structure may sometimes be deformed to a certain extent, posing a potential threat to its safety. Therefore, for shield tunnels that are still in the construction stage, it is particularly important to take appropriate reinforcement measures, especially to enhance stability by adding internal support structures. In actual operation, how to efficiently and safely install these support structures inside the tunnel has become an issue that requires careful consideration. In this application, the upper ring support 1 and the lower ring support 4 installed on the vertical installation mechanism are transported to the designated installation position by using a trolley; the main function of the vertical installation mechanism is to fit the upper ring support 1 and the lower ring support 4 to the exact position in the tunnel, and the main function of the working platform 13 is to provide an operating platform to facilitate manual installation of the left ring support 2 and the right ring support 3 between the upper ring support 1 and the lower ring support 4 to form a full ring support, while also facilitating disassembly work. Overall, this application can reduce the installation difficulty of the full ring support, speed up installation efficiency, and help reduce the workload and safety of workers. After assembly, the full ring support can enhance the overall rigidity of the tunnel lining and reduce environmental impact.

[0022] To further optimize the solution, the vertical installation mechanism includes: The upper hydraulic cylinder 7 and the lower hydraulic cylinder 14 are respectively installed vertically and collinearly on the trolley, the top telescopic end of the upper hydraulic cylinder 7 is detachably connected to the upper ring support 1, and the bottom telescopic end of the lower hydraulic cylinder 14 is detachably connected to the lower ring support 4.

[0023] The main functions of the upper hydraulic cylinder 7 and the lower hydraulic cylinder 14 are to drive the upper ring support 1 and the lower ring support 4, and push them to the designated installation position, and then separate them from the upper ring support 1 and the lower ring support 4.

[0024] To further optimize the solution, the vertical installation mechanism also includes: Connector 8, the top telescopic end of the upper hydraulic cylinder 7 and the bottom telescopic end of the lower hydraulic cylinder 14 are respectively fixedly connected with the connector 8, and the upper ring support 1 and the lower ring support 4 are respectively detachably connected to the two groups of connectors 8 by bolts.

[0025] The connector 8 is adapted to the contact surface of the upper ring support 1 and the lower ring support 4, that is, it is arranged in accordance with the shape of the upper ring support 1 and the lower ring support 4. This arrangement can ensure the connection stability between the connector 8 and the upper ring support 1 and the lower ring support 4; when the upper ring support 1, the left ring support 2, the right ring support 3, and the lower ring support 4 are installed, remove the bolts on the connector 8 and shorten the upper hydraulic cylinder 7 and the lower hydraulic cylinder 14.

[0026] To further optimize the solution, the vertical installation mechanism also includes: Lateral baffles 9 : Several lateral baffles 9 are symmetrically fixedly connected to both sides of the connector 8 , and the upper ring support 1 and the lower ring support 4 are respectively adapted between the several symmetrical lateral baffles 9 .

[0027] The main function of the lateral baffle 9 is to ensure the installation direction of the upper ring support 1 and the lower ring support 4, to improve the force between the connector 8 and the upper ring support 1 and the lower ring support 4, and to effectively improve the installation accuracy and efficiency.

[0028] To further optimize the solution, the vertical installation mechanism also includes: First connecting holes 6, a plurality of first connecting holes 6 are respectively opened on the upper ring support 1 and the lower ring support 4; Second connection holes 10: A plurality of second connection holes 10 are provided on the connector 8. The first connection holes 6 and the second connection holes 10 are provided correspondingly. The corresponding first connection holes 6 and the second connection holes 10 are connected with bolts.

[0029] The first connecting hole 6, the second connecting hole 10 and the bolts can realize the connection between the upper ring support 1, the lower ring support 4 and the connector 8, which is convenient for trolley transportation.

[0030] Further optimization plans also include: Steps 11 : A plurality of steps 11 are installed on the trolley and are located on both sides of the upper hydraulic cylinder 7 .

[0031] The trolley is provided with a step 11 to facilitate workers to install or remove bolts between the connector 8 on the upper hydraulic cylinder 7 and the upper ring support 1.

[0032] Further optimization plans also include: The latch 12 is rotatably connected to the side wall 17 of the trolley body by a first side edge of the working platform 13, and the latch 12 is installed between the second side edge of the working platform 13 and the side wall 17 of the trolley body; A connecting rod 18 is installed between the trolley and the unfolded working platform 13 .

[0033] The main function of the latch 12 is to limit the working platform 13 to the side wall 17 of the vehicle body. After the working platform 13 is unfolded, the connecting rod 18 is connected between the second side of the working platform 13 and the side wall 17 of the vehicle body. The connecting rod 18 is installed between the trolley and the working platform 13 by bolts to maintain the unfolding angle of the working platform 13.

[0034] Further optimization plans also include: Paved road surface 15: A paved road surface 15 is installed at the bottom of the tunnel.

[0035] The bottom of the trolley is equipped with wheels 16 to facilitate the movement of the trolley on the paved road surface 15; when the trolley moves to the designated position, the paved road surface 15 corresponding to the lower ring support 4 is removed, and then the lower ring support 4 is installed.

[0036] The present application provides a method for using a shield tunnel annular rigid support assembly auxiliary trolley system, the shield tunnel annular rigid support assembly auxiliary trolley system comprising the following steps: Step 1: Use handling and lifting equipment to hoist the upper ring support 1 to the top of the vertical installation mechanism and connect it. Hoist the lower ring support 4 to the bottom of the vertical installation mechanism and connect it. Use the traction equipment to push the trolley to the installation position, and remove the paved road surface 15 under the lower ring support 4 to show the installation position of the lower ring support 4. Step 2: After reaching the predetermined installation position, start the vertical installation mechanism and extend it, so that the upper ring support 1 is attached to the top wall of the tunnel and the lower ring support 4 is attached to the bottom of the tunnel; Step 3: unfold the working platform 13 on the trolley, manually carry the left ring support 2 and the right ring support 3 to the predetermined installation position, and connect them to the upper ring support 1 and the lower ring support 4 with bolts; Step 4: After the upper ring support 1, left ring support 2, right ring support 3 and lower ring support 4 are installed, a complete ring support is formed. Disassemble the connection between the upper ring support 1, lower ring support 4 and the vertical installation mechanism, start the vertical installation mechanism and shorten it, fold the working platform 13, and push out the trolley.

[0037] The vertical installation mechanism on the trolley can not only complete the installation of the upper ring support 1 and the lower ring support 4, but also realize the removal of the upper ring support 1 and the lower ring support 4. Among them, when the upper ring support 1 and the lower ring support 4 are respectively attached to the top and bottom of the tunnel, the left ring support 2 and the right ring support 3 are placed in the direction of the tunnel between the upper ring support 1 and the lower ring support 4 in turn by manual handling, and then installed. To further optimize the solution, in step three, the two ends of the upper ring support 1, the left ring support 2, the right ring support 3 and the lower ring support 4 are fixedly connected with connecting plates 5, and the connecting plates 5 on the upper ring support 1, the left ring support 2 and the lower ring support 4, as well as the connecting plates 5 on the upper ring support 1, the right ring support 3 and the lower ring support 4 are connected by bolts.

[0038] When the left ring support 2 and the right ring support 3 are placed between the upper ring support 1 and the lower ring support 4, the connection between the upper ring support 1, the left ring support 2 and the lower ring support 4 is achieved through the connecting plate 5 and the bolts, and the connection between the upper ring support 1, the right ring support 3 and the lower ring support 4 is achieved.

[0039] The overall usage method is: push the trolley to a relatively open steel support temporary storage area (such as a subway station), use conventional handling and lifting equipment to lift the upper ring support 1 to the connector 8 of the upper hydraulic cylinder 7 of the trolley, and connect the upper ring support 1 and the connector 8 with bolts; place the lower ring support 4 directly below the connector 8 on the lower hydraulic cylinder 14, control the extension of the lower hydraulic cylinder 14 to make the connector 8 fit with the lower ring support 4, and connect the lower ring support 4 and the connector 8 with bolts; after the upper ring support 1 and the lower ring support 4 are connected to the connector 8, completely retract the upper hydraulic cylinder 7 and the lower hydraulic cylinder 14 to the shortest state, and push the trolley to the predetermined installation position in the tunnel.

[0040] After the trolley reaches the predetermined position, the simple paved road surface 15 directly below the lower ring support 4 is removed to clear the installation space, and then the upper hydraulic cylinder 7 and the lower hydraulic cylinder 14 are controlled to extend until the upper ring support 1 and the lower ring support 4 are completely in contact with the inner wall of the tunnel. After that, the working platforms 13 on both sides of the trolley are unfolded and fixed to the trolley through the connecting rod 18.

[0041] The left ring support 2 and the right ring support 3 of the left and right parts are installed with the help of the working platform 13. Since the length of these two parts of steel support is short and the mass per linear meter does not exceed 30 kg, they can be carried manually. After the two parts of steel support are placed in the predetermined position, the entire ring support is connected as a whole by bolts.

[0042] After the whole ring support is connected, remove the 16 connecting bolts between the upper hydraulic cylinder 7, the lower hydraulic cylinder 14 and the upper ring support 1, the lower ring support 4, and control the upper hydraulic cylinder 7 and the lower hydraulic cylinder 14 to retract to the shortest state; remove the connecting rod 18 on the working platform 13, close the working platform 13 to be parallel to the vehicle side wall 17, and fix it with the pin 12; level the road surface, push the trolley away, and the assembly of a ring of steel support (whole ring support) is completed.

[0043] After the entire ring support is used up, the trolley can be used to continue the dismantling work. The specific work flow is opposite to the above process and will not be repeated here.

[0044] This application relates to a new shield tunnel annular steel support assembly auxiliary trolley, which can improve the installation and removal efficiency of shield tunnel annular steel supports (full ring supports) and reduce the installation difficulty and labor pressure of the rigid supports. Specifically: (1) The trolley has the function of transporting steel supports, which can solve the problem of transporting steel supports from the temporary storage area to the installation area.

[0045] (2) The upper ring support 1 and the lower ring support 4 are heavy, and the upper ring support 1 is difficult to install and is not suitable for hoisting. In view of this, the trolley adopts the upper hydraulic cylinder 7 and the lower hydraulic cylinder 14 to reduce the difficulty of its installation and removal process.

[0046] (3) The left ring support 2 and the right ring support 3 are relatively light in weight, but their installation positions are relatively high from the ground. In view of this, working platforms 13 are provided on the left and right sides of the trolley. With the help of the platforms, the steel supports can be more easily moved to the designated position for the whole ring splicing operation.

[0047] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are intended only to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] It should also be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A shield tunnel annular rigid support assembly auxiliary trolley system, characterized in that: include: Trolley; A vertical mounting mechanism, the vertical mounting mechanism being mounted on the trolley and being arranged corresponding to the top and bottom of the tunnel, the top of the vertical mounting mechanism being detachably connected to the upper ring support (1), and the bottom of the vertical mounting mechanism being detachably connected to the lower ring support (4); Working platforms (13), two groups of working platforms (13) are respectively installed on both sides of the trolley and are limited on the trolley.

2. The shield tunnel annular rigid support assembly auxiliary trolley system according to claim 1 is characterized in that: The vertical installation mechanism includes: An upper hydraulic cylinder (7) and a lower hydraulic cylinder (14), wherein the upper hydraulic cylinder (7) and the lower hydraulic cylinder (14) are respectively vertically mounted on the trolley, the top telescopic end of the upper hydraulic cylinder (7) is detachably connected to the upper ring support (1), and the bottom telescopic end of the lower hydraulic cylinder (14) is detachably connected to the lower ring support (4).

3. The shield tunnel annular rigid support assembly auxiliary trolley system according to claim 2 is characterized in that: The vertical mounting mechanism further comprises: Connectors (8), the top telescopic end of the upper hydraulic cylinder (7) and the bottom telescopic end of the lower hydraulic cylinder (14) are respectively fixedly connected to the connectors (8), and the upper ring support (1) and the lower ring support (4) are respectively detachably connected to the two groups of connectors (8).

4. The shield tunnel annular rigid support assembly auxiliary trolley system according to claim 3 is characterized in that: The vertical mounting mechanism further comprises: Side baffles (9), a plurality of side baffles (9) are symmetrically fixedly connected to both sides of the connector (8), and the upper ring support (1) and the lower ring support (4) are respectively adapted between the plurality of symmetrical side baffles (9).

5. The shield tunnel annular rigid support assembly auxiliary trolley system according to claim 3 is characterized in that: The vertical mounting mechanism further comprises: First connecting holes (6), a plurality of first connecting holes (6) are respectively provided on the upper ring support (1) and the lower ring support (4); Second connection holes (10), a plurality of second connection holes (10) are provided on the connector (8), the first connection holes (6) and the second connection holes (10) are arranged correspondingly, and the corresponding first connection holes (6) and the second connection holes (10) are connected by bolts.

6. The shield tunnel annular rigid support assembly auxiliary trolley system according to claim 2, characterized in that: Also includes: Steps (11), a plurality of steps (11) are installed on the trolley and are located on both sides of the upper hydraulic cylinder (7).

7. The shield tunnel annular rigid support assembly auxiliary trolley system according to claim 2 is characterized in that: Also includes: A latch (12), wherein a first side edge of the working platform (13) is rotatably connected to a vehicle body side wall (17) of the trolley, and the latch (12) is installed between a second side edge of the working platform (13) and the vehicle body side wall (17); A connecting rod (18) is installed between the trolley and the unfolded working platform (13).

8. The shield tunnel annular rigid support assembly auxiliary trolley system according to claim 1 is characterized in that: Also includes: A paved road surface (15) is installed at the bottom of the tunnel.

9. A method for using a shield tunnel annular rigid support assembly auxiliary trolley system, characterized in that: The shield tunnel annular rigid support assembly auxiliary trolley system applied to any one of claims 1 to 8 comprises the following steps: Step 1: Use handling and lifting equipment to hang the upper ring support (1) to the top of the vertical installation mechanism and connect it, hang the lower ring support (4) to the bottom of the vertical installation mechanism and connect it, and push the trolley to the installation position; Step 2: After reaching the predetermined installation position, the vertical installation mechanism is activated and extended, and the upper ring support (1) is attached to the top wall of the tunnel, and the lower ring support (4) is attached to the bottom of the tunnel; Step 3: unfold the working platform (13) on the trolley, manually carry the left ring support (2) and the right ring support (3) to the predetermined installation position, and connect them to the upper ring support (1) and the lower ring support (4) through bolts; Step 4: After the upper ring support (1), the left ring support (2), the right ring support (3) and the lower ring support (4) are installed to form a complete ring support, the connection between the upper ring support (1), the lower ring support (4) and the vertical installation mechanism is disassembled, the vertical installation mechanism is started and shortened, the working platform (13) is folded, and the trolley is pushed out.

10. The method for using the shield tunnel annular rigid support assembly auxiliary trolley system according to claim 9, characterized in that: In the step 3, the ends of the upper ring support (1), the left ring support (2), the right ring support (3) and the lower ring support (4) are respectively fixedly connected with connecting plates (5), and the connecting plates (5) on the upper ring support (1), the left ring support (2) and the lower ring support (4) and the connecting plates (5) on the upper ring support (1), the right ring support (3) and the lower ring support (4) are connected by bolts.

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