Reinforcing device for improving overall flexural rigidity of inner flange single-pipe tower

Abstract

The invention discloses a reinforcing device capable of improving the overall flexural rigidity of an inner flange single-pipe tower. The reinforcing device comprises metal connecting pieces, circumferential fixing rods and longitudinal reinforcing rods. The metal connecting piece is connected with the circumferential fixing rod through a bolt; the longitudinal reinforcing rods are connected with the metal connecting pieces through through holes formed in the metal connecting pieces; and the metal connecting piece is connected with a flange rib plate in the single-pipe tower. On the basis that an existing inner flange structure is not damaged, the rib plates on the flange plates in the single-pipe tower are punched, the inner flange rib plates on the two different inner flange faces are connected with the metal layer parts of the metal connecting pieces in a bolt connection mode, and then the metal connecting pieces on the flange plates are connected and fixed through the circumferential fixing rods; the longitudinal reinforcing rods between the two layers of different flange faces are connected with the metal connecting piece through the through holes in the metal connecting piece; and a rubber pad is arranged between the upper longitudinal reinforcing rod and the lower longitudinal reinforcing rod in the through hole. The overall flexural rigidity of the structure can be improved, and installation is convenient.

Description

Technical Field

[0001] This invention relates to the field of steel structure tower reinforcement technology, specifically to a reinforcement device for improving the overall bending stiffness of an inner flange single-tube tower. Background Technology

[0002] Mobile communication signal towers are mainly composed of single-tube towers with different connection methods. Upgrading a 4G signal tower to a 5G signal tower requires adding new antennas and their auxiliary equipment to platforms at different heights, based on the existing single-tube tower structure.

[0003] The main loads on an inner flange monotube tower during service are its structural weight, antenna weight, wind load on the structure, and wind load on the antenna. Changes in antenna weight and windward area cause the original monotube tower structure to be unable to withstand the new structural loads, resulting in permanent deformation due to bending. Adding reinforcement devices directly to the outside of the inner flange monotube tower would directly disrupt the flow field around the tower, leading to new uncertainties in the structural loads.

[0004] In existing technologies, reinforcement schemes for single-tube tower structures are commonly found in single-tube towers with external flange connections or sleeve connections. A common method for reinforcing the overall structure of a single-tube tower is to add multiple reinforcement structures along the axial direction of the single-tube tower on its outer side. For example, patent CN110847676A discloses a reinforcement device for a single-tube tower, including multiple reinforcement structures distributed along the axial direction of the single-tube tower. Each reinforcement structure includes multiple locking clamps fixed to the single-tube tower, distributed along the axial direction. Each locking clamp has multiple locking blocks, and the locking blocks on the same axis are connected by fixing screws. The fixing screws of adjacent reinforcement structures on the same axis are fixedly connected by threaded sleeves. This patent reinforces the entire exterior of the single-tube tower through external reinforcement structures to improve its load-bearing capacity. It can quickly determine the reinforcement method based on calculation results, achieving proactive, rapid, and accurate single-tube tower reinforcement work; alternatively, ropes can be used to replace the rods as a new reinforcement scheme.

[0005] Patent CN112482820A discloses a reinforcement device for a single-tube tower, comprising a single-tube tower. A first reinforcement device and a second reinforcement device are sequentially installed on the outer surface of the single-tube tower from top to bottom. Each of the first and second reinforcement devices includes multiple reinforcement blocks fixed to the surface of the single-tube tower. A support block is fixed to the reinforcement block of the second reinforcement device. The outer end of the support block is connected to the reinforcement block of the first reinforcement device at the same vertical position to form a triangular structure via a first tensioning device, ensuring the support block is horizontally positioned. The outer end of the support block is connected to a foundation counterweight block located on the periphery of the bottom of the single-tube tower via a second tensioning device, which is vertically positioned. This patent achieves active, rapid, and accurate reinforcement of single-tube towers, significantly reducing site area requirements compared to traditional steel cable tensioning methods.

[0006] Single-tube tower structures with external flange connections and sleeve connections have sufficient external space available, so the solutions proposed in the aforementioned patents can be used for overall structural reinforcement. However, due to spatial constraints, rope reinforcement methods cannot be used for internal flange single-tube towers, and the reinforcement of axially distributed rod structures also requires improvement. Therefore, how to improve the overall bending stiffness of the structure based on existing internal flange single-tube towers has become a challenge in design and construction. Summary of the Invention

[0007] To address the issue of how to improve the overall bending stiffness of existing internal flange single-tube towers, this application designs a reinforcement device to enhance the overall bending stiffness of internal flange single-tube towers. This device can improve the overall bending stiffness of the structure without damaging the existing internal flange structure, and is also easy to install. It strengthens the single-tube tower structure by setting metal connectors and making holes in the reinforcing ribs of the internal flange for fixed connection with the metal connectors. The device also includes circumferential fixing rods and longitudinal reinforcing rods, thus solving the design and construction challenges of improving the overall bending stiffness of existing internal flange single-tube towers.

[0008] The specific technical solution provided in this application is as follows:

[0009] A reinforcement device for improving the overall bending stiffness of an inner flange single-tube tower includes a metal connector, a circumferential fixing rod, and a longitudinal reinforcing rod; the metal connector and the circumferential fixing rod are connected by bolts; the longitudinal reinforcing rod is connected to the metal connector through a through hole in the metal connector;

[0010] The metal connector is connected to the flange rib plate inside the single-tube tower.

[0011] Preferably, the metal connector has a concave structure, with a mounting hole on the metal connector and a fixing hole on the inner flange rib. The mounting hole on the metal connector and the fixing hole on the inner flange rib are connected by bolts.

[0012] Preferably, the metal connector has a metal sandwich structure, which is a concave structure. During installation, the inner flange rib is located within the concave structure of the metal sandwich, and the metal sandwich is fixedly connected to the inner flange rib by bolts passing through the mounting hole and the fixing hole in sequence.

[0013] Preferably, the metal connector has a connecting hole, through which the circumferential fixing rod is connected and fixed to the metal connector.

[0014] Preferably, the circumferential fixing rod includes a reinforcing rib and a flat plate, wherein the flat plate is disposed at both ends of the reinforcing rib;

[0015] Preferably, the plate has a second mounting hole, which corresponds to the connecting hole. The two ends of the reinforcing rib are connected to the metal connector by bolts through the second mounting hole on the plate and the connecting hole on the metal connector.

[0016] In a preferred embodiment, a rubber pad with a thickness of 10 mm is provided between the two longitudinal reinforcing rods.

[0017] In a preferred embodiment, the maximum compression stroke of the rubber pad is approximately 30% to 40% of the rubber thickness. When the longitudinal reinforcing bar undergoes small bending deformation, the bending deformation of a single segment of the longitudinal reinforcing bar provides bending stiffness. When the longitudinal reinforcing bar undergoes large bending deformation, the overall reinforcement structure undergoes bending deformation simultaneously to provide bending stiffness.

[0018] Based on the above-mentioned reinforcement device that can improve the overall bending stiffness of a single-tube tower with an inner flange, the installation steps during use include:

[0019] Step 1: Based on the existing internal flange single-tube tower, drill fixing holes on the internal flange ribs at the connection position of the two tower sections respectively;

[0020] Step 2: Connect and fix the metal connector to the upper and lower inner flange ribs of the flange through the mounting holes.

[0021] Step 3: Fix the circumferential fixing rod to the side of the metal connector through the connecting hole;

[0022] Step 4: After completing steps 1-3 above, place a rubber pad in the through hole of the metal connector, and install the longitudinal connecting rods of the two different inner flange surfaces into the through hole respectively.

[0023] The advantages and technical effects of this application are as follows:

[0024] (1) The present invention uses a connection device structure that works with the flange inside the single-tube tower. Without damaging the existing inner flange structure, it only requires drilling holes in the ribs on the flange inside the single-tube tower to fix them. The inner flange ribs on the two different inner flange surfaces are connected to the metal layer of the metal connector by bolt connection. At this time, the "concave" shaped metal connector forms an installation relationship embedded in the two inner flanges at the middle position. Then, the metal connectors on the flange are connected and fixed to each other by the circumferential fixing rod. The circumferential fixing rod acts as a circumferential reinforcing rib. The longitudinal reinforcing rod between the two different flange surfaces is connected to the metal connector through the through hole on the metal connector. The longitudinal reinforcing rod provides the bending stiffness of the overall structure.

[0025] (2) A rubber pad is provided between the upper and lower longitudinal stiffeners in the through hole. When the longitudinal stiffener bends and deforms, the longitudinal displacement generated by the longitudinal stiffener parallel to the segmented single-tube tower can be absorbed by the rubber pad because the rubber pad is circumferentially deformable. At the same time, the rubber has incompressible properties. When the longitudinal stiffener bends and deforms, the bending deformation of the single segment of the longitudinal stiffener provides bending stiffness. When the longitudinal stiffener bends and deforms, the bending deformation of the entire reinforcement structure provides bending stiffness.

[0026] (3) The reinforcement device designed in this invention can improve the overall bending stiffness of the inner flange single-tube tower. It can not only improve the overall bending stiffness of the structure, but also facilitate installation and will not damage the existing inner flange structure of the single-tube tower.

[0027] (4) As a reinforcement scheme that can improve the overall bending stiffness of the inner flange single-tube tower on the existing basis, the present invention can improve the overall bending stiffness without changing the external structure of the single-tube tower, and only requires the installation of the connection structures given in the present invention. Moreover, the bending stiffness design scheme formed by the reinforcement device designed in the present invention can retain the existing structure to the greatest extent in the future renovation of similar single-tube tower signal towers, reduce the amount of engineering construction, and improve the bending stiffness at the same time.

[0028] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0029] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0031] Figure 1 This is a schematic diagram of the overall structure of the reinforcement device disclosed in this invention, which can improve the overall bending stiffness of an inner flange single-tube tower after installation.

[0032] Figure 2 This is a structural schematic diagram of a reinforcement device disclosed in this invention that can improve the overall bending stiffness of an inner flange single-tube tower;

[0033] Figure 3 This is a schematic diagram of the existing monotube tower's overall structure and the connection point between the two sections of the tower body.

[0034] Figure 4 This is a schematic diagram of the structure of the inner flange rib on the flange of a single-tube tower, with fixing holes made on the inner flange rib.

[0035] Figure 5 This is a schematic diagram of the metal connector in a reinforcement device for improving the overall bending stiffness of an inner flange single-tube tower disclosed in this invention.

[0036] Figure 6 This is a schematic diagram of the circumferential connecting rod in a reinforcement device for improving the overall bending stiffness of an inner flange single-tube tower disclosed in this invention;

[0037] Figure 7 This is a schematic diagram of a reinforcement device for improving the overall bending stiffness of an inner flange single-tube tower, as disclosed in this invention, in which a rubber pad is provided between the upper and lower longitudinal reinforcing rods in the through hole.

[0038] Figure 8 This is a schematic diagram of the overall reinforcement of a single-tube tower with an inner flange, which can improve the overall bending stiffness of the tower.

[0039] Reference numerals: 1. Metal connector; 11. Mounting hole one; 12. Through hole; 13. Connection hole; 14. Metal interlayer; 2. Circumferential fixing rod; 21. Reinforcing rib; 22. Mounting hole two; 23. Flat plate; 3. Longitudinal reinforcing rod; 4. Rubber gasket; 5. Inner flange rib; 51. Fixing hole. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0041] It should be understood that the phrase "an embodiment" or "this embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "an embodiment" or "this embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0042] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0043] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0044] In this article, the term "at least one" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, "at least one of A and B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0045] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0046] Example 1

[0047] This embodiment describes the structure of a reinforcement device that can improve the overall bending stiffness of an inner flange monotube tower.

[0048] This embodiment takes the reinforcement of the connection between two sections of a single-tube tower as an example. Figure 3 As shown, Figure 3 This is a schematic diagram of the existing single-tube tower's overall structure and the connection point between the two sections of the tower.

[0049] As attached Figure 1 , 2 As shown, Figure 1 This is a schematic diagram of the overall structure of the reinforcement device disclosed in this invention, which can improve the overall bending stiffness of a single-tube tower with an inner flange, after installation. Figure 2 This is a structural schematic diagram of a reinforcement device for improving the overall bending stiffness of a single-tube tower with an inner flange, as disclosed in this invention. The reinforcement device includes a metal connector 1, a circumferential fixing rod 2, and a longitudinal reinforcing rod 3. The metal connector 1 is connected to the circumferential fixing rod 2 by bolts. The longitudinal reinforcing rod 3 is connected to the metal connector 1 through a through hole 12. The metal connector 1 is connected to the inner flange rib plate 5 of the single-tube tower.

[0050] The thickness of the longitudinal stiffening rod 3 can be adjusted according to the required increase in bending stiffness of the overall structure. Mechanics of materials indicates that the bending stiffness is proportional to the cube of the radius of the stiffening rod 3.

[0051] As attached Figure 4 , 5 As shown, Figure 4 This is a schematic diagram of the structure of the inner flange rib on the flange of a single-tube tower, with fixing holes made on the inner flange rib. Figure 5 This is a schematic diagram of the metal connector in a reinforcement device for improving the overall bending stiffness of a single-tube tower with an inner flange, as disclosed in this invention. Figure 4 The schematic diagram of the inner flange rib is drawn from Figure 3 The interface AA' at the existing single-tube tower connection is shown.

[0052] The metal connector 1 has a concave structure. The metal connector 1 is provided with a mounting hole 11 and a fixing hole 51 is provided on the inner flange rib 5. The mounting hole 11 on the metal connector 1 and the fixing hole 51 on the inner flange rib 5 are connected by bolts.

[0053] It should be noted that, for example Figure 4 The fixing hole 51 shown is provided on the inner flange ribs on both different flange surfaces.

[0054] Furthermore, the metal connector 1 is provided with a metal interlayer 14 structure, the metal interlayer 14 is a concave structure and is located on both sides of the metal connector 1; during installation, the inner flange ribs 5 on the upper and lower flange surfaces are all located in the concave structure of the metal interlayer 14, and the metal interlayer 14 and the inner flange ribs 5 are fixedly connected by bolts through the mounting hole 11 and the fixing hole 51 in sequence.

[0055] Furthermore, the inner sides of the metal interlayers 14 on both sides, where they connect to the metal connectors 1, are chamfered, as shown in the attached figure. Figure 5 The process chamfer 15 shown

[0056] Furthermore, the metal connector 1 is provided with a connection hole 13, through which the circumferential fixing rod 2 is connected and fixed to the metal connector 1.

[0057] As attached Figure 6 As shown, Figure 5 This is a schematic diagram of the circumferential connecting rod in a reinforcement device for improving the overall bending stiffness of a single-tube tower with an inner flange, as disclosed in this invention. The circumferential fixing rod 2 includes a reinforcing rib 21 and a flat plate 23. The flat plate 23 is disposed at both ends of the reinforcing rib 21. The flat plate 23 has mounting holes 22, which correspond to the connecting holes 13. The two ends of the reinforcing rib 21 are respectively connected to the metal connector 1 by bolts through the mounting holes 22 on the flat plate 23 and the connecting holes 13 on the metal connector 1.

[0058] In this embodiment, without damaging the existing inner flange structure, it is only necessary to drill holes in the ribs on the flange inside the single-tube tower and connect the inner flange ribs on the two different inner flange surfaces to the metal layer of the metal connector using bolts. Then, the metal connectors on the flange are connected and fixed together by circumferential fixing rods, which act as circumferential reinforcing ribs. The longitudinal reinforcing rods between the two different flange surfaces are connected to the metal connectors through through holes in the metal connectors, providing bending stiffness to the overall structure. The various connecting structures in this reinforcement device not only improve the bending stiffness of the overall structure but also offer convenient installation.

[0059] Example 2

[0060] Based on Example 1, the fixing device is further described.

[0061] As attached Figure 7 As shown, Figure 6This is a schematic diagram of a reinforcement device for improving the overall bending stiffness of a single-tube tower with an inner flange, disclosed in this invention, in which a rubber pad is placed between two longitudinal reinforcing rods in a through hole. A rubber pad 4, 10mm thick, is placed between the two longitudinal reinforcing rods 3. When the longitudinal reinforcing rod 3 bends and deforms, the circumferentially deformable rubber pad 4 absorbs the longitudinal displacement generated by the bending deformation of the longitudinal reinforcing rod 3 parallel to the segmented single-tube tower. Simultaneously, the maximum compression stroke of the rubber pad 4 is approximately 30% to 40% of its thickness. When the bending deformation of the longitudinal reinforcing rod 3 is small, the bending deformation of a single segment of the longitudinal reinforcing rod provides bending stiffness; when the bending deformation of the longitudinal reinforcing rod 3 is large, the overall reinforcement structure simultaneously bends and deforms, providing bending stiffness.

[0062] Example 3

[0063] Based on Examples 1 and 2, the method of using the reinforcement device that can improve the overall bending stiffness of the inner flange single-tube tower is briefly described.

[0064] Taking the reinforcement of the connection between two sections of a single-tube tower as an example, the installation steps of this reinforcement device include:

[0065] Step 1: Based on the existing inner flange single-tube tower, drill fixing holes 51 on the inner flange rib plate 5 at the connection position of the two tower sections respectively;

[0066] Step 2: Connect and fix the metal connector 1 to the upper and lower inner flange ribs 5 of the flange through the mounting hole 11.

[0067] Step 3: Fix the circumferential fixing rod 2 to the side of the metal connector 1 through the connecting hole 13;

[0068] Step 4: After completing steps 1-3 above, place a rubber pad 4 in the through hole 12 of the metal connector 1, and install the longitudinal connecting rods 3 with different inner flange surfaces in the through hole 12 respectively.

[0069] The completed single-tube tower reinforcement structure is shown in the attached figure. Figure 1 , 8 As shown, Figure 1 This is a schematic diagram of the overall structure of the reinforcement device disclosed in this invention, which can improve the overall bending stiffness of a single-tube tower with an inner flange, after installation. Figure 8 This is a schematic diagram of the overall reinforcement device for improving the overall bending stiffness of a single-tube tower with an inner flange, as disclosed in this invention.

[0070] This invention not only improves the overall bending stiffness of the structure but also facilitates installation without damaging the existing flange structure of the monotube tower. Furthermore, as a reinforcement solution that enhances the overall bending stiffness of a monotube tower with an internal flange, this invention can improve the overall bending stiffness without altering the external structure of the monotube tower, simply by installing the connection structures provided in this invention.

[0071] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A reinforcing device for improving the overall bending stiffness of a single-tube tower with a liftable inner flange, characterized in that, The reinforcing device comprises a metal connecting piece (1), a circumferential fixing rod (2), and a longitudinal reinforcing rod (3); the metal connecting piece (1) is connected with the circumferential fixing rod (2) through bolts; the longitudinal reinforcing rod (3) is connected with the metal connecting piece (1) through a through hole (12) formed on the metal connecting piece (1). The metal connecting piece (1) is connected with the inner flange rib plate (5) of the single-pipe tower.

2. A device for enhancing the overall bending stiffness of a single tower with a liftable inner flange according to claim 1, characterized in that, The metal connecting piece (1) is of a "concave" structure, and an installation hole (11) is formed on the metal connecting piece (1); a fixing hole (51) is formed on the inner flange rib plate (5); and the installation hole (11) on the metal connecting piece (1) is connected with the fixing hole (51) on the inner flange rib plate (5) through bolts.

3. A device for enhancing the overall bending stiffness of a single tower with a liftable inner flange according to claim 2, characterized in that, A metal interlayer (14) is arranged on the metal connecting piece (1), the metal interlayer (14) is of a "concave" structure and is arranged on both sides of the metal connecting piece (1); during installation, the inner flange rib plates (5) on the upper and lower flange surfaces are arranged in the "concave" structure of the metal interlayer (14) and are connected with the metal interlayer (14) and the inner flange rib plate (5) through bolts.

4. A device for enhancing the overall bending stiffness of a single tower with lifting internal flanges according to any of claims 1 or 2 or 3, characterized in that, A connecting hole (13) is formed on the metal connecting piece (1), and the circumferential fixing rod (2) is connected with the metal connecting piece (1) through the connecting hole (13).

5. A device for enhancing the overall bending stiffness of a single tower with lifting internal flanges according to any of claims 1 or 2 or 3, characterized in that, The circumferential fixing rod (2) comprises a reinforcing rib (21) and a flat plate (23), and the flat plate (23) is arranged on both ends of the reinforcing rib (21). An installation hole (22) is formed on the flat plate (23), the installation hole (22) corresponds to the connecting hole (13), and both ends of the reinforcing rib (21) are connected with the metal connecting piece (1) through the installation hole (22) on the flat plate (23) and the connecting hole (13) on the metal connecting piece (1) through bolts.

6. A device for enhancing the overall bending stiffness of a single tower with lifting internal flanges according to any of claims 1 or 2 or 3, characterized in that, A rubber pad (4) is arranged between the two longitudinal reinforcing rods (3), and the thickness of the rubber pad (4) is 10 mm.

7. A device for enhancing the overall bending stiffness of a single tower with lift- off inner flange according to claim 6, characterized in that, The maximum compression stroke of the rubber pad (4) is about 30% to 40% of the thickness of the rubber pad (4); when the longitudinal reinforcing rod (3) is slightly bent and deformed, the bending stiffness is provided by the bending deformation of the single longitudinal reinforcing rod; when the longitudinal reinforcing rod (3) is greatly bent and deformed, the bending stiffness is provided by the bending deformation of the overall reinforcing structure.

8. A method of using a strengthening device for increasing the overall bending stiffness of a single-tower with lift internal-flange according to any one of claims 1-7, characterized in that, The installation steps of the reinforcing device comprise: Step 1: based on the existing inner flange single-pipe tower, a fixing hole (51) is drilled on the inner flange rib plate (5) at the connection position of the two tower bodies; Step 2: the metal connecting piece (1) is connected with the inner flange rib plates (5) on the upper and lower flange plates through the installation hole (11); Step 3: the circumferential fixing rod (2) is fixed on the side surface of the metal connecting piece (1) through the connecting hole (13). Step 4, after completing the above steps 1-3, the rubber pad (4) is placed in the through hole (12) of the metal connecting piece (1), and the two layers of longitudinal connecting rods (3) with different inner flanges are respectively installed in the through hole (12).

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