Internal flange single-pipe tower local anti-bending-shear rigidity reinforcing device and using method

Abstract

The invention discloses an inner flange single-pipe tower local anti-bending and anti-shearing rigidity reinforcing device and method.The reinforcing device comprises an upper circular channel steel, a lower circular channel steel, structural ribs, an inner flange reinforcing rib connecting structure and a fixed prestress spring structure; the upper circular channel steel and the lower circular channel steel are connected through structural ribs; fixed prestressed spring structures are arranged in grooves of the upper circular channel steel and the lower circular channel steel; inner flange reinforcing rib connecting structures are arranged at the bottom of the upper circular channel steel and the top of the lower circular channel steel; the upper circular steel channel and the lower circular steel channel are each formed by splicing two C-shaped steel channels, and the two C-shaped steel channels are fixed through circumferential gap filling rubber. By means of the design, on the basis that the external structure of the inner flange single-pipe tower is not changed, the bending rigidity of the local dangerous section is improved, the shearing force of the dangerous section is reduced, and then the technical effect of enhancing the strength of the flange plates of the two-section single-pipe tower is achieved.

Description

Technical Field

[0001] This invention relates to the field of building steel structures, specifically to a device for strengthening the local bending and shear stiffness of an internal flange single-tube tower and its method of use. Background Technology

[0002] According to the design specifications for steel tower and mast structures in mobile communication engineering, the single-tube tower structure is subjected to cantilever compression-bending, therefore the overall structural stress is bending deformation. For cantilever compression-bending deformation, the internal forces at any cross-section include shear force, axial force, and bending moment. In particular, the bolts connecting the flanges of the two-segment single-tube tower are difficult to meet the strength requirements of the bolt structure and the reinforcing ribs on the flanges under new load conditions.

[0003] There are three main connection methods between the tower sections of mobile communication signal towers: internal flange connection, external flange connection, and sleeve connection. The main loads on an internal flange monotube tower during service are its own weight, antenna weight, wind load on the structure, and wind load on the antenna. Converting an existing internal flange monotube tower to a 5G signal tower requires adding new antennas and their auxiliary devices at different heights. 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. Reinforcing the monotube tower with external flanges or using sleeves would disrupt the flow field around the internal flange monotube tower, leading to new uncertainties in the structural load; however, reinforcing the entire monotube tower would increase construction costs.

[0004] Reinforcement schemes for single-tube tower structures are generally divided into two main categories: overall structural reinforcement and partial structural reinforcement. Overall structural reinforcement is often used in single-tube tower structures with external flange connections or sleeve connections. For example, Chinese patents CN110847676A and CN112482820A are typical examples of using rods and tensioned ropes as reinforcement structures to strengthen the overall structure of a single-tube tower. Partial structural reinforcement is also common in single-tube tower structures with external flange connections and sleeve connections. The main method is to increase the structural thickness at the locations requiring reinforcement. For example, Chinese patents CN113152975A and CN114508637A use steel plates of different arc lengths for local reinforcement; Chinese patent CN111576912A uses a combination of fixed steel plates and a metal frame for local reinforcement. Internal flange single-tube towers, as a common structural form for mobile communication signal towers, have been widely used. With continuous technological advancements, when internal flange monotube towers carrying 4G mobile communication equipment are converted into 5G signal towers, it is often necessary to add new platforms and antenna equipment to the existing structure. The addition of new antenna equipment increases the self-weight load and wind load on the monotube tower structure, potentially causing permanent deformations such as bending in existing internal flange monotube towers under these new loads. However, due to the limited internal structural space, monotube tower structures suitable for external flange and sleeve connections cannot be directly used in internal flange monotube tower structures.

[0005] Therefore, it is crucial to design a connection structure and manufacturing method that can enhance the strength of the flange of a two-segment single-tube tower based on the existing flange single-tube tower structure. With the help of this structure, it is particularly important to reduce the stress at the critical section of the inner flange single-tube tower structure. Summary of the Invention

[0006] When an inner flange monotube tower is converted into a signal tower, it may experience permanent deformation such as bending under new loads. However, monotube tower structures designed for external flange and sleeve connections cannot be directly used in monotube tower structures with internal flange connections. Therefore, to address the above issues, this invention designs a local bending and shear stiffness reinforcement device and its usage method for inner flange monotube towers. This aims to improve the local bending stiffness of the inner flange monotube tower and reduce the shear force at the critical section without altering the external structure of the monotube tower, thereby enhancing the strength of the flange of the two-segment monotube tower.

[0007] A local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange includes an upper circular channel steel, a lower circular channel steel, structural reinforcement, an inner flange reinforcing reinforcement connection structure, and a fixed prestressed spring structure.

[0008] The upper circular channel steel and the lower circular channel steel are connected by structural ribs;

[0009] The grooves of the upper circular channel steel and the lower circular channel steel are both equipped with fixed prestressed spring structures.

[0010] The bottom of the upper circular channel steel and the top of the lower circular channel steel are both provided with an inner flange reinforcing rib connection structure.

[0011] Preferably, both the upper and lower circular channel steels are composed of two C-shaped channel steels spliced ​​together, and the two C-shaped channel steels are fixed by filling the circumferential gap with rubber.

[0012] Preferably, the fixed prestressed spring structure includes a spring placement tube and a compression spring;

[0013] The compression spring is placed inside the spring placement tube;

[0014] The spring placement tube is placed horizontally in the grooves of the upper and lower circular channel steel.

[0015] Preferably, the inner flange reinforcing rib connection structure includes two fastening plates, and the spacing between the two fastening plates is the same as the thickness of the inner flange reinforcing rib.

[0016] Preferably, the fastening plate is provided with bolt holes.

[0017] Preferably, the top of the structural rib is fixedly connected to the inner side of the annular wall of the upper circular channel steel;

[0018] The bottom of the structural rib is fixedly connected to the inner side of the annular wall of the lower circular channel steel.

[0019] Preferably, the circumferential gap filling rubber has a U-shaped structure.

[0020] Preferably, the circumferential gap filling rubber includes a large U-shaped plate and a small U-shaped plate;

[0021] The small U-shaped plate is nested within the large U-shaped plate, and the large U-shaped plate and the small U-shaped plate are fixedly connected as a whole by a connecting beam.

[0022] A method for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange includes the following steps:

[0023] Step S1: Assemble the upper circular channel steel, lower circular channel steel, structural reinforcement, inner flange reinforcing reinforcement connection structure and fixed prestressed spring structure into a local bending and shear stiffness reinforcement device for an inner flange single-tube tower.

[0024] Step S2: Drill bolt holes in the fastening plate;

[0025] Step S3: Install the compression spring in the spring placement tube and ensure that the compression spring is in a compressed state;

[0026] Step S4: Install the assembled reinforcement device at the connection position between the two tower sections, and fix the inner flange reinforcing rib connection structure to the inner flange reinforcing rib with bolts;

[0027] Step S5: Install circumferential gap filler rubber between the two C-shaped channel steels.

[0028] Preferably, in step S4, it is also necessary to drill bolt holes for the reinforcing ribs on the inner flange.

[0029] The advantages and effects of this application are as follows:

[0030] 1. The present application proposes a local bending and shear stiffness reinforcement device for an inner flange single-tube tower. It uses C-shaped channel steel to form an upper circular channel steel and a lower circular channel steel, and a fixed prestressed spring structure is set in the groove of the C-shaped channel steel. Through the above design, the bending stiffness of the inner flange single-tube tower can be significantly improved.

[0031] 2. The present invention provides a local bending and shear stiffness reinforcement device for an inner flange single-tube tower. By placing the device at the connection point between the two sections of the tower body of the inner flange single-tube tower, it can improve the bending stiffness of the local dangerous section and reduce the shear force of the dangerous section without changing the external structure of the single-tube tower, thereby achieving the technical effect of strengthening the flange of the two-section single-tube tower.

[0032] 3. Without changing the overall structure of the single-tube tower with the inner flange connection, this application strengthens the structural strength of a certain section of the single-tube tower by placing the reinforcing device designed in this application at the connection position of the two sections of the tower body. It is easy to install during construction and can meet the engineering requirements of upgrading the 4G signal tower of the inner flange single-tube tower to a 5G signal tower by adding new antennas and auxiliary equipment.

[0033] 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.

[0034] 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

[0035] 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.

[0036] Figure 1 A structural diagram of a local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange provided in this application;

[0037] Figure 2 A schematic diagram of a local bending and shear stiffness reinforcement device for an inner flange single-tube tower, provided in this application, placed between two tower sections;

[0038] Figure 3 This is a partial enlarged view of the connection between the inner flange reinforcing rib and the fastening plate provided in this application;

[0039] Figure 4 A structural diagram of a local bending and shear stiffness reinforcement device for an inner flange single-tube tower without compression springs, provided in this application;

[0040] Figure 5 The structural diagram of the inner flange reinforcing rib provided in this application;

[0041] Figure 6 The structural diagram of the compression spring provided in this application;

[0042] Reference numerals: 1. Upper circular channel steel; 2. Lower circular channel steel; 3. Structural reinforcement; 4. Inner flange reinforcing rib connection structure; 5. Fixed prestressed spring structure; 6. C-shaped channel steel; 7. Circumferential gap filling rubber; 8. Spring placement tube; 9. Compression spring; 10. Fastening plate; 11. Bolt hole; 12. Inner flange reinforcing rib; 13. Large U-shaped plate; 14. Small U-shaped plate; 15. Connecting beam. Specific Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Example 1

[0050] Please refer to Figure 1 This embodiment mainly introduces a local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange, including an upper circular channel steel 1, a lower circular channel steel 2, a structural rib 3, an inner flange reinforcing rib connection structure 4, and a fixed prestressed spring structure 5.

[0051] The upper circular channel steel 1 and the lower circular channel steel 2 are connected by structural ribs 3;

[0052] The upper circular channel steel 1 and the lower circular channel steel 2 are both provided with fixed prestressed spring structures 5.

[0053] The bottom of the upper circular channel steel 1 and the top of the lower circular channel steel 2 are both provided with an inner flange reinforcing rib connection structure 4.

[0054] Furthermore, both the upper circular channel steel 1 and the lower circular channel steel 2 are composed of two C-shaped channel steels 6 spliced ​​together, and the two C-shaped channel steels 6 are fixed by filling the circumferential gap with rubber 7; the C-shaped channel steels, as the main body of the reinforcement structure, bear the main structural bending stiffness.

[0055] Furthermore, the gap between the two C-shaped channel steels is 10mm.

[0056] Furthermore, the fixed prestressed spring structure 5 includes a spring placement tube 8 and a compression spring 9;

[0057] The compression spring 9 is placed inside the spring placement tube 8. For the state without the compression spring, please refer to [the documentation / reference]. Figure 4 .

[0058] The spring placement tube 8 is horizontally placed in the grooves of the upper circular channel steel 1 and the lower circular channel steel 2. The design of the spring placement tube 8 is described in [reference needed]. Figure 6 .

[0059] Furthermore, the length of the spring placement tube 8 is 5 mm less than the span of the C-shaped channel steel.

[0060] Furthermore, the inner flange reinforcing rib connection structure 4 includes two fastening plates 10, and the distance between the two fastening plates 10 is the same as the thickness of the inner flange reinforcing rib 12.

[0061] Furthermore, the fastening plate 10 is provided with bolt holes 11.

[0062] Furthermore, the top of the structural rib 3 is fixedly connected to the inner side of the annular wall of the upper circular channel steel 1;

[0063] The bottom of the structural rib 3 is fixedly connected to the inner side of the annular wall of the lower circular channel steel 2.

[0064] Furthermore, when the structural reinforcement 3 provides bending stiffness, it is proportional to the cube of the width and the thickness. When the reinforcement acts as shear reinforcement, its shear capacity is proportional to its cross-sectional area.

[0065] Furthermore, the circumferential gap filling rubber 7 has a U-shaped structure.

[0066] Furthermore, the circumferential gap filling rubber 7 includes a large U-shaped plate 13 and a small U-shaped plate 14;

[0067] The small U-shaped plate 14 is nested within the large U-shaped plate 13, and the large U-shaped plate 13 and the small U-shaped plate 14 are fixedly connected as a whole by a connecting beam 15.

[0068] Furthermore, the thickness of the circumferential gap filling rubber is more than 1.3 times the gap thickness, and the width is not less than 40 mm.

[0069] This invention relates to a device for strengthening the local bending and shear stiffness of an inner flange single-tube tower. By placing the device at the connection point between the two sections of the tower body, it can improve the bending stiffness of the local critical section and reduce the shear force of the critical section, thereby strengthening the flange of the two-section single-tube tower, while ensuring the existing structure and without changing the external structure of the single-tube tower.

[0070] This application presents a device for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange. The device uses C-shaped channel steel to form an upper circular channel steel and a lower circular channel steel, and a fixed prestressed spring structure is set in the groove of the C-shaped channel steel. Through the above design, the bending stiffness of the single-tube tower with an inner flange can be significantly improved.

[0071] Example 2

[0072] Based on Example 1, this example mainly introduces a method for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange, including the following steps:

[0073] Step S1: Assemble the upper circular channel steel 1, the lower circular channel steel 2, the structural reinforcement 3, the inner flange reinforcing rib connection structure 4, and the fixed prestressed spring structure 5 into a local bending and shear stiffness reinforcement device for an inner flange single-tube tower.

[0074] Step S2: Drill bolt holes 11 on the fastening plate 10;

[0075] Step S3: Install the compression spring 9 in the spring placement tube 8, and ensure that the compression spring 9 is in a compressed state;

[0076] Step S4: Install the assembled reinforcement device at the connection point between the two tower sections, and fix the inner flange reinforcing rib connection structure 4 to the inner flange reinforcing rib 12 with bolts; please refer to the completed design. Figure 2Please refer to the diagram showing the fixed connection between the inner flange reinforcing rib connection structure 4 and the inner flange reinforcing rib 12. Figure 3 .

[0077] Step S5: Install circumferential gap filler rubber 7 between the two C-shaped channel steels 6.

[0078] For further details, please refer to... Figure 5 In step S4, it is also necessary to drill bolt holes for the reinforcing ribs on the inner flange reinforcing ribs 12.

[0079] This application, without altering the overall structure of the single-tube tower with the inner flange connection, strengthens the structural strength of a certain section of the single-tube tower by placing the reinforcing device designed in this application at the connection point between the two sections of the tower body. It is easy to install during construction and can meet the engineering requirements of upgrading a 4G signal tower with an inner flange to a 5G signal tower by adding new antennas and auxiliary equipment.

[0080] The above description is merely a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations to these embodiments within the spirit and principles of the present invention, achieved through conventional substitutions or by achieving the same function without departing from the principles and spirit of the present invention, fall within the scope of protection of the present invention.

Claims

1. A device for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange, characterized in that, It includes an upper circular channel steel (1), a lower circular channel steel (2), structural ribs (3), an inner flange reinforcing rib connection structure (4), and a fixed prestressed spring structure (5); The upper circular channel steel (1) and the lower circular channel steel (2) are connected by structural ribs (3); The upper circular channel steel (1) and the lower circular channel steel (2) are both provided with fixed prestressed spring structures (5); The bottom of the upper circular channel steel (1) and the top of the lower circular channel steel (2) are both provided with an inner flange reinforcing rib connection structure (4).

2. The device for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange according to claim 1, characterized in that, The upper circular channel steel (1) and the lower circular channel steel (2) are both composed of two C-shaped channel steels (6) spliced ​​together, and the two C-shaped channel steels (6) are fixed by filling the circumferential gap with rubber (7).

3. A local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange according to any one of claims 1 or 2, characterized in that, The fixed prestressed spring structure (5) includes a spring placement tube (8) and a compression spring (9); The compression spring (9) is placed inside the spring placement tube (8); The spring placement tube (8) is placed horizontally in the grooves of the upper circular channel steel (1) and the lower circular channel steel (2).

4. A local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange according to any one of claims 1 or 2, characterized in that, The inner flange reinforcing rib connection structure (4) includes two fastening plates (10), and the distance between the two fastening plates (10) is the same as the thickness of the inner flange reinforcing rib (12).

5. The device for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange according to claim 4, characterized in that, The fastening plate (10) is provided with bolt holes (11).

6. A local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange according to any one of claims 1 or 2, characterized in that, The top of the structural rib (3) is fixedly connected to the inner side of the annular wall of the upper circular channel steel (1); The bottom of the structural rib (3) is fixedly connected to the inner side of the annular wall of the lower circular channel steel (2).

7. The device for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange according to claim 2, characterized in that, The circumferential gap filling rubber (7) has a U-shaped structure.

8. A local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange according to any one of claims 2 or 7, characterized in that, The circumferential gap filling rubber (7) includes a large U-shaped plate (13) and a small U-shaped plate (14); The small U-shaped plate (14) is nested in the large U-shaped plate (13), and the large U-shaped plate (13) and the small U-shaped plate (14) are fixedly connected as a whole by a connecting beam (15).

9. The method of using the local bending and shear stiffness reinforcement device for a single-tube tower with an inner flange according to any one of claims 1 to 8, characterized in that, Includes the following steps: Step S1: Assemble the upper circular channel steel (1), the lower circular channel steel (2), the structural reinforcement (3), the inner flange reinforcing reinforcement connection structure (4), and the fixed prestressed spring structure (5) into a local bending and shear stiffness reinforcement device for an inner flange single-tube tower. Step S2: Drill bolt holes (11) on the fastening plate (10); Step S3: Install the compression spring (9) in the spring placement tube (8) and ensure that the compression spring (9) is in a compressed state; Step S4: Install the assembled reinforcement device at the connection position between the two tower sections, and fix the inner flange reinforcing rib connection structure (4) and the inner flange reinforcing rib (12) with bolts; Step S5: Install circumferential gap filling rubber (7) between the two C-shaped channel steels (6).

10. A method for strengthening the local bending and shear stiffness of a single-tube tower with an inner flange according to claim 9, characterized in that, In step S4, it is also necessary to drill bolt holes for the reinforcing ribs on the inner flange reinforcing ribs (12).

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