Prestressed antenna tower crown wind resisting cable and its installation method

Abstract

The present application relates to the technical field of special structure, and discloses a prestressed antenna tower crown wind-resistant cable and a mounting method thereof, wherein the existing annular horse path in the tower crown is replaced by a material with elasticity, then a horse path force transmission cable is arranged between the annular horse paths, and the horse path force transmission cable and the elastic annular horse path are combined to form an energy dissipation system for converting high-frequency vibration of the antenna main column into elastic deformation in the annular horse path; the structure of the existing base in the tower crown is adjusted, so that the upper layer of the base is suspended to form an elastic suspended layer, and the base force transmission cable, the elastic suspended layer and the antenna main column are combined to form an energy dissipation system for converting low-frequency vibration of the antenna main column into elastic deformation in the elastic suspended layer; only some prestressed cables are newly added in the whole tower crown, so that the ability of the building tower crown to resist wind-induced vibration is greatly improved, and the self-weight of the matched damper is also greatly reduced, so that the whole antenna tower crown is light and easy to install.

Description

Technical Field

[0001] This invention relates to the field of special structure technology, and in particular to a prestressed antenna tower crown wind-resistant cable and its installation method. Background Technology

[0002] A tower crown, as the name suggests, is the "hat" of a tower-style high-rise building, placed on top of the building for decorative purposes. An antenna tower crown is a type of tower crown that combines the functions of a tower crown and an antenna. The main body of an antenna tower crown consists of one or more steel structural columns mounted on a base, sometimes with additional crossbeams.

[0003] Due to the significant wind load on the tops of high-rise buildings, antenna tower crowns require a series of reinforcing structures to withstand the wind. Sometimes, the structure alone is insufficient to resist the wind load, necessitating the use of dampers. The most commonly used damper in buildings is the tuned mass damper (TMD damper), characterized by its heavy counterweight. When used in antenna tower crowns, it is typically installed at the base of the antenna or even inside the building.

[0004] With the development of modern fluid dynamics technologies such as CFD, the vibrations caused by wind loads on antenna tower crowns have been studied more thoroughly. Taking the Hytera Global Headquarters Tower crown, as an example, this invention utilizes CFD technology and wind tunnels to accurately calculate the amplitude of wind-induced vibrations at different locations and potential extreme situations, allowing for the targeted installation of dampers. By calculating and placing the damper at the location of maximum amplitude, and combining it with a frequency-adjustable eddy current damper, the required size and weight of the damper can be significantly reduced. This theoretically allows the damper to be integrated with the building's tower crown assembly, eliminating the need for separate installation and significantly lowering costs.

[0005] However, the location of the maximum wind-induced vibration amplitude on the antenna tower crown is not necessarily fixed. If the main body of the antenna tower crown were a rigid rod, then the location of the maximum wind-induced vibration amplitude would be fixed, and usually at the top. However, the excessive length of the antenna tower crown means that it cannot be considered a rigid rod, which means that the location of the maximum vibration amplitude may be different each time, making it impossible to accurately install the damper at the location of the maximum amplitude.

[0006] Relying solely on the structural strength of the antenna tower crown to resist wind loads without dampers presents another challenge. The antenna tower crown already houses numerous electronic devices, as well as walkways, ladders, and other auxiliary structures for easy maintenance. These components result in a significant overall weight for the antenna tower crown, making it difficult to hoist as a whole; it requires either in-situ assembly at height or assembly at height followed by jacking into place. If the antenna tower crown's structural strength is relied upon to resist wind loads, further reinforcement is needed, increasing its weight and raising the requirements for high-altitude work platforms and corresponding protective measures.

[0007] Prestressed cables are commonly used reinforcing components that can significantly enhance the strength of buildings. However, in current technology, the use of prestressed cables in columnar structures is usually as a form of reinforced guy rope, with limited effectiveness in improving the wind resistance of antenna tower crowns. Summary of the Invention

[0008] This invention provides a prestressed antenna tower crown wind-resistant cable and its installation method.

[0009] The technical problem to be solved is that the existing wind-resistant components of the antenna tower crown are too heavy, which is not conducive to the construction of the antenna tower crown, while the prestressed cables, although light, are not enough to meet the wind resistance requirements of the antenna tower crown.

[0010] To solve the above technical problems, the present invention adopts the following technical solution: a prestressed antenna tower crown wind-resistant cable, wherein the wind-resistant cable is a prestressed cable and is used together with a damper pre-installed on the top of the antenna tower crown to prevent the building tower crown from experiencing harmful vibrations, including vortex-induced vibrations, under wind loads. The tower crown includes a base and an antenna main column inserted into the middle of the base and fixedly connected to the base. The base is divided into upper and lower layers, which are connected by columns around the base. The upper part of the base is a three-dimensional truss made of elastic rods, and is referred to as the elastic suspended layer. The antenna main column is equipped with an installation and maintenance system that serves as a work platform for tower crown installation and subsequent maintenance. The installation and maintenance system includes a ring-shaped walkway that is spaced vertically on the antenna main column and fixedly connected to the antenna main column, and a ladder that is set between two adjacent ring-shaped walkways and used to connect the two ring-shaped walkways. The wind-resistant cables include a catwalk force transmission cable arranged around the antenna main column, and a base force transmission cable arranged between the middle of the antenna main column and the edge of the elastic suspension layer. The power transmission cable of the walkway is a prestressed cable that is connected to the upper and lower two circular walkways at its upper and lower ends respectively, and is spaced apart along the circumference of the antenna main column. The lowermost power transmission cable of the walkway extends downward and connects to the base. The circular walkway is an elastic element and together with the power transmission cable of the walkway, it forms an energy dissipation system for converting the vibration of the antenna main column into deformation in the circular walkway. The base force transmission cable is a prestressed cable arranged radially around the antenna main column. The base force transmission cable, together with the elastic suspension layer and the antenna main column, forms an energy dissipation system that converts the vibration of the antenna main column into deformation in the elastic suspension layer.

[0011] A method for installing a prestressed antenna tower crown wind-resistant cable, used for installing the aforementioned prestressed antenna tower crown wind-resistant cable, includes the following steps: Step 1: Design the antenna main column segmentation scheme, dividing the antenna main column, installation and maintenance system, and the attached catwalk force transmission cable into multiple prefabricated segments, with the self-weight of each segment not exceeding the maximum lifting capacity of the hoisting equipment; Step 2: According to the segmentation scheme in Step 1, assemble the antenna main column and installation and maintenance system into prefabricated segments on the ground. Among the prefabricated segments, the segment where the upper end of the base force transmission cable is located is called the cable-on segment. Step 3: Install the base: Step 4: Install the antenna main column segment by segment, and use the installation and maintenance system as a work platform to complete the connection of the antenna main column. Use the installation and maintenance system as a work platform to install the cable-stayed bridge between the prefabricated segments until the cable segments are installed. Step 5: Install and tension the base power transmission cable; Step Six: Install the antenna main columns segment by segment, using the installation and maintenance system as a work platform to connect the antenna main columns. Then, using the installation and maintenance system as a work platform, install the prefabricated cable-stayed bridge between the segments until all antenna main columns are installed. Step 7: Complete the tensioning of all the catwalk force transmission cables and base force transmission cables.

[0012] Furthermore, the annular walkway is fixedly connected to the antenna main column by connecting rods. Each connecting rod has ear plates welded to its upper and lower surfaces, which serve as both lifting lugs and prestressed cable connection points. The number of connecting rods in each layer of the annular walkway is the same and they are aligned vertically.

[0013] Furthermore, the antenna main column is a steel column whose cross-section gradually decreases from bottom to top. The steel column contains three segments with different cross-sections, which are respectively called the base segment, the limiting segment, and the top segment from bottom to top. The annular walkway on the segments with the same cross-section has the same size. In step one, the portion of the base section above the base is divided into a prefabricated segment; In step two, when assembling the prefabricated segments corresponding to the base section, only the connecting rods and lugs are installed; In step four, after the foundation section is hoisted and connected to the base, the circular walkway is assembled layer by layer in situ from bottom to top. Then, the walkway force transmission cables are installed and tensioned. When assembling the circular walkway, the lower circular walkway or base is used as a construction platform.

[0014] Furthermore, the segments of the antenna main column are connected by variable diameter steel pipes. In step one, when the antenna main column is divided, each variable diameter steel pipe is placed completely in the prefabricated segment. The prefabricated sections corresponding to the foundation section also include the variable diameter steel pipe above the foundation section, the connecting rod of the ring-shaped walkway at the bottom of the limiting section, and the ring-shaped walkway at the bottom of the limiting section.

[0015] Furthermore, in step four, the catwalk tension cables of the foundation section are installed in the following manner: After the foundation section is hoisted and connected to the base, the circular walkway is assembled in situ layer by layer from bottom to top, with temporary support structures set under each layer of the circular walkway; Starting with the bridle cable connecting the uppermost circular bridle of the base section and the lowermost circular bridle of the limiting section, install the bridle cables layer by layer from top to bottom. After each layer of bridle cables is installed, remove the temporary support structure of the adjacent circular bridle below that layer of bridle cables, and then tension the bridle cables until the bridle cables between the base and the lowermost circular bridle are installed.

[0016] Furthermore, the base force transmission cables located in the prefabricated segments are tensioned during the ground assembly stage, and the catwalk force transmission cables between the prefabricated segments are tensioned in situ.

[0017] Furthermore, in step five, the base section of the antenna main column is assembled together with the base as a whole. During the assembly process, temporary supports are set under the elastic suspension layer and are removed immediately after the base is assembled.

[0018] Compared with the prior art, the prestressed antenna tower crown wind-resistant cable and its installation method of the present invention have the following advantages: In this invention, by replacing the existing annular walkway in the tower crown with an elastic material, and then installing walkway force-transmitting cables between the annular walkways, the force-transmitting cables and the elastic annular walkways combine to form an energy-dissipating system that converts the high-frequency vibration of the antenna main column into elastic deformation in the annular walkways. By adjusting the structure of the existing base in the tower crown, an elastic suspended layer is formed by suspending the upper layer of the base. The base force-transmitting cables, the elastic suspended layer, and the antenna main column combine to form an energy-dissipating system that converts the low-frequency vibration of the antenna main column into elastic deformation in the elastic suspended layer. The ability of the tower crown to resist wind-induced vibration is significantly improved by simply adding some prestressed cables to the entire tower crown. In this invention, the bridle force transmission cable resists the bending of the antenna main column, making the antenna main column exhibit the characteristics of a rigid structure. When wind-induced vibration occurs, the position with the largest amplitude is fixed in one position, and then a tuned mass damper is installed at the position with the largest amplitude, so that the damper can play a more effective role. The required volume and weight are greatly reduced, and it can be pre-installed in the antenna main column without the need for separate installation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the base assembly. Figure 2 This is a schematic diagram of the basic section installation. To more clearly show its main structure, the guardrails and ladders have been removed from the diagram. The same applies below. Figure 3 This is a schematic diagram showing the connection between the basic segment and the limiting segment; Figure 4 This is a schematic diagram of the installation of the base force transmission cable; Figure 5 This is a schematic diagram showing the completed assembly of the building's tower crown. Figure 6 To remove Figure 5 A schematic diagram showing the components that need to be installed on-site on the main column of the central antenna; Figure 7 A schematic diagram of the connection of the catenary force transmission cable at the variable diameter position of the antenna main column; Figure 8 A schematic diagram showing the connection of the catenary force transmission cable at the same diameter position of the antenna main column; Figure 9 A schematic diagram showing the connection between the base force transmission cable and the ring-shaped walkway; In the diagram, 1-base, 11-elastic suspension layer, 2-antenna main column, 3-ring walkway, 4-walkway force transmission cable, 5-base force transmission cable. Detailed Implementation

[0020] Taking Hytera's global headquarters building as an example, such as Figure 5 As shown, a prestressed antenna tower crown wind-resistant cable is provided. The wind-resistant cable, being a prestressed cable, is used in conjunction with a damper pre-installed at the top of the antenna tower crown to prevent harmful vibrations, including vortex-induced vibrations, from occurring on the tower crown under wind loads. The tower crown includes a base 1 and an antenna main column 2 inserted into the middle of the base 1 and fixedly connected to it. In this embodiment, the damper is a tuned mass eddy current damper. Note that the antenna main column 2 must not penetrate the lower layer of the base 1, otherwise it will affect energy dissipation.

[0021] According to simulation results, the maximum amplitude of wind-induced vibration of the antenna crown in this invention is located at the top of the antenna crown. If a damper is installed at this location, a very small damper is required and can be pre-installed within the antenna main column 2. In this embodiment, a wind tunnel was used to simulate the acceleration of the tower crown under common wind speeds at the top of the Hytera building. The results show that at four common wind speeds at the top of the building, the peak acceleration of the tower crown under different wind conditions is approximately 0.25~0.5 m / s², indicating significant vibration. Furthermore, vortex-induced vibration may also occur under extreme wind conditions.

[0022] like Figure 1 As shown, the base 1 is divided into upper and lower layers, which are connected by columns around the base 1. The upper part of the base 1 is a three-dimensional truss made of elastic rods, and is referred to as the elastic suspended layer 11. To meet the stress characteristics of the upper part of the base 1, the rods of the upper part of the base 1 need to be arranged in a radial, obliquely upward pattern with the antenna main column 2 as the center.

[0023] An installation and maintenance system is provided on the antenna main column 2 as a working platform for tower crown installation and subsequent maintenance. The installation and maintenance system includes a ring-shaped walkway 3 that is spaced vertically on the antenna main column 2 and fixedly connected to the antenna main column 2, and a ladder that is set between two adjacent ring-shaped walkways 3 and used to connect the two ring-shaped walkways 3. The wind-resistant cables include a catwalk force transmission cable 4 set around the antenna main column 2, and a base force transmission cable 5 set between the middle of the antenna main column 2 and the edge of the elastic suspension layer 11. The catwalk force transmission cable 4 is a prestressed cable that is connected to the upper and lower two annular catwalks 3 at its upper and lower ends respectively, and is arranged at intervals along the circumference of the antenna main column 2. The lowermost catwalk force transmission cable 4 extends downward and connects to the base 1. The annular catwalk 3 is an elastic element, and together with the catwalk force transmission cable 4, it forms an energy dissipation system for converting the vibration of the antenna main column 2 into deformation in the annular catwalk 3. When the antenna main column 2 between the two circular walkways 3 bends, it causes the walkway force transmission cable 4 to expand and contract, thereby causing the circular walkway 3 to undergo periodic elastic deformation. During the periodic elastic deformation of the circular walkway 3, mechanical energy is converted into the internal energy of the circular walkway 3, and thus gradually dissipated. The amplitude and frequency of the vibration within a single energy dissipation system are relatively small, so it mainly deals with high-frequency vibrations.

[0024] In this embodiment, the circular walkway 3 uses an elastic circular steel pipe beam as the main load-bearing component, with planks welded on top and guardrails welded around the perimeter. When the antenna main column 2 experiences small vibrations, the circular steel pipe beam undergoes periodic elastic deformation under the traction of the walkway's force-transmitting cables 4, converting mechanical energy into the internal energy of the circular steel pipe beam. Note that expansion joints must be provided in both the guardrails and planks to prevent damage to the circular steel pipe beam during deformation.

[0025] The base force transmission cable 5 is a prestressed cable arranged radially around the antenna main column 2. The base force transmission cable 5, together with the elastic suspension layer 11 and the antenna main column 2, forms an energy dissipation system that converts the vibration of the antenna main column 2 into deformation in the elastic suspension layer 11.

[0026] Here, the swaying of the antenna main column 2 is transmitted to the elastic suspension layer 11 via the base force transmission cable 5, causing the elastic suspension layer 11 to undergo periodic elastic deformation, thus converting mechanical energy into the internal energy of the elastic suspension layer 11. The amplitude and frequency of the vibration within a single energy-consuming system are relatively large, therefore it mainly deals with low-frequency vibrations.

[0027] like Figure 1-5 As shown, a method for installing a prestressed antenna tower crown wind-resistant cable is used to install the aforementioned prestressed antenna tower crown wind-resistant cable, and includes the following steps: Step 1: Design the segmentation scheme for antenna main column 2. Divide antenna main column 2, installation and maintenance system, and auxiliary catwalk force transmission cable 4 into multiple prefabricated segments as a whole. The self-weight of each segment shall not exceed the maximum lifting weight of the hoisting equipment. All hoisting equipment that can reach the rooftop has a relatively small maximum lifting capacity. In this embodiment, a small tower crane on the rooftop is used as the hoisting equipment. However, due to the limited load-bearing capacity of the rooftop, it cannot meet the requirement of hoisting the entire antenna main column 2 at once. Therefore, it is necessary to assemble each prefabricated segment on the ground, and then transport them to the rooftop using a ground tower crane or construction elevator, and finally hoist them using a tower crane on the rooftop.

[0028] Step 2: According to the segmentation scheme in Step 1, the antenna main column 2 and the installation and maintenance system are assembled into prefabricated segments on the ground. Among the prefabricated segments, the segment where the upper end of the base force transmission cable 5 is located is called the cable-on segment. Here, the ring-shaped walkway 3, damper and other auxiliary components are pre-placed on the antenna main column 2 on the ground.

[0029] Step 3: As Figure 1 As shown, mounting base 1: The base 1 is assembled in situ, but due to its low height, no high-altitude work platform is needed. However, for the subsequent tensioning of the base's load-bearing cables 5, a small temporary support frame needs to be installed between the upper and lower layers of base 1, such as... Figure 1 As shown, the temporary support frame is set below the antenna main column 2.

[0030] Step Four: As Figure 2-5 As shown, the antenna main column 2 is installed segment by segment, and the connection of the antenna main column 2 is completed using the installation and maintenance system as the work platform. The prefabricated cable-stayed bridge 4 between the segments is then installed using the installation and maintenance system as the work platform until the cable segments are installed. The positions of the prefabricated cable-stayed bridge 4 between the segments are as follows: Figure 6 As shown; Step 5: Install and tension the base transmission cable 5; Step Six: Install the antenna main columns 2 segment by segment, and use the installation and maintenance system as a work platform to complete the connection of the antenna main columns 2. Use the installation and maintenance system as a work platform to install the prefabricated catenary cables 4 between the segments until all antenna main columns 2 are installed. Step 7: Complete the tensioning of all the catwalk force transmission cables 4 and the base force transmission cables 5.

[0031] The reason for tensioning the base transmission cable 5 last is that its tension is greatly affected by the installation process. The tension of the walkway transmission cable 4, on the other hand, is less affected; most of the walkway transmission cables can be tensioned during ground prefabrication, while the rest are tensioned immediately after installation. Of course, it is still necessary to check the tension of each walkway transmission cable 4 at the end, and adjust it if it does not meet the set value.

[0032] The circular walkway 3 is fixedly connected to the antenna main column 2 via connecting rods. Each connecting rod has lugs welded to its upper and lower surfaces, serving as both lifting lugs and connection points for the prestressed cables. The number of connecting rods in each layer of the circular walkway 3 is the same, and they are aligned vertically. The connection method between the prestressed cables and the circular walkway 3 is as follows: Figure 6-9 As shown.

[0033] "The ear plate, which simultaneously serves as a lifting lug and a connection point for prestressed cables," means that during the precast segment hoisting, the upper ear plate is used as a lifting lug, and at the same time, it also serves as a connection point for the prestressed cables such as the catwalk force transmission cable 4 and the base force transmission cable 5. The connecting rods need to be aligned vertically to ensure that the catwalk force transmission cable 4 is aligned vertically.

[0034] The antenna main column 2 is a steel column whose cross-section gradually decreases from bottom to top. The steel column contains three segments with different cross-sections, which are respectively called the base segment, the limiting segment, and the top segment from bottom to top. The annular walkway 3 on the segments with the same cross-section has the same size. Unlike conventional steel columns, the various loads on the antenna main column 2 are not located at the top of the antenna main column 2, but on its side. Therefore, the load-bearing capacity requirements at different locations on the antenna main column 2 vary, necessitating the use of variable-diameter steel columns. Of the three sections, the limiting section needs to be connected to the base force transmission cable 5, hence its name.

[0035] In step one, the portion of the base section above base 1 is divided into a prefabricated segment; In step two, when assembling the prefabricated segments corresponding to the base section, only the connecting rods and lugs are installed; In step four, after the foundation section is hoisted and connected to the base 1, the circular walkway 3 is assembled layer by layer in situ from bottom to top. Then, the walkway force transmission cables 4 are installed and tensioned. When assembling the circular walkway 3, the circular walkway 3 or the base 1 below is used as the construction platform.

[0036] The steel columns of the foundation section and the accompanying circular walkway 3 are very large. If the circular walkway 3 is pre-installed in the prefabricated sections, it needs to be cut very short, which is not as advantageous as high-altitude in-situ assembly, since the foundation section can be directly assembled using the base 1 as a working platform. However, the connecting rods and lugs still need to be pre-installed in the prefabricated sections to meet the hoisting requirements.

[0037] The segments of the antenna main column 2 are connected by variable diameter steel pipes. In step one, when dividing the antenna main column 2, each variable diameter steel pipe is placed completely in the prefabricated segment. Here, the antenna main column 2 is not a continuously variable diameter steel pipe column, but a stepped column. The variable diameter steel pipe used for transition cannot be divided, as this would bring a series of problems: firstly, it would be difficult to assemble; secondly, the stress is concentrated at the location of the variable diameter steel pipe, and dividing it would affect the stress distribution.

[0038] like Figure 6 As shown, the prefabricated segments corresponding to the foundation section also include the variable diameter steel pipe above the foundation section, the connecting rod of the ring-shaped walkway 3 at the bottom of the limiting section, and the ring-shaped walkway 3 at the bottom of the limiting section.

[0039] The reason for using this structure for the prefabricated segments corresponding to the foundation section is to facilitate the subsequent top-down installation and tensioning method of the catwalk force transmission cable 4.

[0040] In step four, the catwalk force transmission cable 4 of the foundation section is installed in the following manner: After the foundation section is hoisted and connected to the base 1, the circular walkway 3 is assembled in situ layer by layer from bottom to top, and temporary support structures are set under each layer of the circular walkway 3. Starting with the catwalk force transmission cable 4 between the uppermost circular catwalk 3 of the base section and the lowermost circular catwalk 3 of the limiting section, the catwalk force transmission cables 4 are installed layer by layer from top to bottom. After each layer of catwalk force transmission cables 4 is installed, the temporary support structure of the adjacent circular catwalk 3 below that layer of catwalk force transmission cables 4 is removed, and then the catwalk force transmission cables 4 are tensioned until the catwalk force transmission cables 4 between the base 1 and the lowermost circular catwalk 3 are installed.

[0041] If the catwalk force transmission cable 4 is installed from bottom to top, each installation and tensioning process will cause deformation of the base 1, and the cable force will inevitably be disturbed. Therefore, it is chosen to install and tension the catwalk force transmission cable 4 from top to bottom. In this way, the force on the uppermost catwalk is more concentrated. Here, the annular catwalk 3 at the bottom of the limiting section is pre-positioned into the corresponding prefabricated segment of the foundation section. Its size is small and its rigidity is high, so it will not deform excessively due to concentrated force. With top-down installation, only the bottommost catwalk force transmission cable 4 will affect the base 1 during tensioning, and the resulting impact is acceptable.

[0042] The base force transmission cable 5 located in the prefabricated segment is tensioned during the ground assembly stage, and the catwalk force transmission cable 4 between the prefabricated segments is tensioned in situ.

[0043] Of the catwalk tension cables 4 here, the one located between the two prefabricated sections is tensioned in situ at high altitude, while the remaining catwalk tension cables 4 are tensioned during the ground assembly stage. Although there is a circular catwalk 3 serving as a working platform for high-altitude tensioning, it is still more convenient to perform tensioning on the ground. The connection of the antenna main column 2 is a conventional steel column connection method, with double-clamped fixing followed by butt welding. If necessary, a temporary support frame can be erected on the catwalk to assist in fixation.

[0044] In step five, the base section of the antenna main column 2 located in the base 1 is assembled together with the base 1 as a whole. During the assembly process, temporary supports are set under the elastic suspension layer 11 of the base 1, and these supports are removed immediately after the base 1 is assembled.

[0045] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A prestressed antenna tower crown wind-resistant cable, characterized in that: The wind-resistant cable is a prestressed cable and is used together with the damper pre-installed on the top of the antenna tower crown to prevent the antenna tower crown from experiencing harmful vibrations, including vortex-induced vibrations, under wind loads. The tower crown includes a base (1) and an antenna main column (2) inserted in the middle of the base (1) and fixedly connected to the base (1). The base (1) is divided into upper and lower layers, which are connected by columns around the base (1). The upper part of the base (1) is a three-dimensional truss made of elastic rods, and is referred to as the elastic suspended layer (11). The antenna main column (2) is provided with an installation and maintenance system that serves as a work platform for tower crown installation and subsequent maintenance. The installation and maintenance system includes a ring-shaped walkway (3) that is spaced vertically on the antenna main column (2) and fixedly connected to the antenna main column (2), and a ladder that is set between two adjacent ring-shaped walkways (3) and used to connect the two ring-shaped walkways (3). The wind-resistant cable includes a catwalk force transmission cable (4) set around the antenna main column (2) and a base force transmission cable (5) set between the middle of the antenna main column (2) and the edge of the elastic suspension layer (11). The catwalk force transmission cable (4) is a prestressed cable that is connected to the upper and lower two annular catwalks (3) at its upper and lower ends respectively, and is arranged at intervals along the circumference of the antenna main column (2). The lowermost catwalk force transmission cable (4) extends downward and connects to the base (1). The annular catwalk (3) is an elastic element, and together with the catwalk force transmission cable (4), it forms an energy dissipation system for converting the vibration of the antenna main column (2) into the deformation in the annular catwalk (3). The base force transmission cable (5) is a prestressed cable arranged radially around the antenna main column (2). The base force transmission cable (5), together with the elastic suspension layer (11) and the antenna main column (2), forms an energy dissipation system for converting the vibration of the antenna main column (2) into the deformation in the elastic suspension layer (11).

2. A method for installing wind-resistant cables on a prestressed antenna tower crown, characterized in that: For installing a prestressed antenna tower crown wind-resistant cable as described in claim 1, the method includes the following steps: Step 1: Design the antenna main column (2) segmentation scheme, divide the antenna main column (2), installation and maintenance system and auxiliary catwalk force transmission cable (4) into multiple prefabricated segments as a whole, and the self-weight of each segment does not exceed the maximum lifting weight of the hoisting equipment; Step 2: According to the segmentation scheme in Step 1, the antenna main column (2) and the installation and maintenance system are assembled into prefabricated segments on the ground. Among the prefabricated segments, the prefabricated segment where the upper end of the base force transmission cable (5) is located is called the cable-on segment. Step 3: Install the base (1): Step 4: Install the antenna main column (2) segment by segment, and use the installation and maintenance system as the work platform to complete the connection of the antenna main column (2). Use the installation and maintenance system as the work platform to install the prefabricated cable-stayed bridge (4) between the segments until the cable segments are installed. Step 5: Install and tension the base transmission cable (5); Step 6: Install the antenna main columns (2) segment by segment, and use the installation and maintenance system as a work platform to complete the connection of the antenna main columns (2). Use the installation and maintenance system as a work platform to install the prefabricated cable-stayed bridge (4) between the segments until all antenna main columns (2) are installed. Step 7: Complete the tensioning of all the bridle cable (4) and the base cable (5).

3. The method for installing wind-resistant cables for a prestressed antenna tower crown according to claim 2, characterized in that: The ring-shaped walkway (3) is fixedly connected to the antenna main column (2) by connecting rods. Each connecting rod has ear plates welded on its upper and lower surfaces, which serve as both lifting lugs and prestressed cable connection points. The number of connecting rods in each layer of the ring-shaped walkway (3) is the same and they are aligned vertically.

4. The method for installing wind-resistant cables for a prestressed antenna tower crown according to claim 3, characterized in that: The antenna main column (2) is a steel column whose cross-section gradually decreases from bottom to top. The steel column contains three segments with different cross-sections, which are respectively called the base segment, the limiting segment, and the top segment from bottom to top. The size of the annular walkway (3) on the segments with the same cross-section is consistent. In step one, the portion of the base segment above the base (1) is divided into a prefabricated segment; In step two, when assembling the prefabricated segments corresponding to the base section, only the connecting rods and lugs are installed; In step four, after the foundation section is hoisted and connected to the base (1), the ring walkway (3) is assembled in situ layer by layer from bottom to top. Then the walkway force transmission cable (4) is installed and tensioned. When assembling the ring walkway (3), the ring walkway (3) below or the base (1) is used as the construction platform.

5. The method for installing wind-resistant cables for a prestressed antenna tower crown according to claim 4, characterized in that: The segments of the antenna main column (2) are connected by variable diameter steel pipes. In step one, when dividing the antenna main column (2), each variable diameter steel pipe is placed completely in the prefabricated segment. The prefabricated sections corresponding to the foundation section also include the variable diameter steel pipe above the foundation section, the connecting rod of the ring walkway (3) at the bottom of the limiting section, and the ring walkway (3) at the bottom of the limiting section.

6. The method for installing wind-resistant cables for a prestressed antenna tower crown according to claim 5, characterized in that: In step four, the catenary cable (4) of the foundation section is installed in the following manner: After the foundation section is hoisted and connected to the base (1), the circular walkway (3) is assembled in situ layer by layer from bottom to top, and a temporary support structure is set under each layer of the circular walkway (3); Starting with the bridle cable (4) between the uppermost circular bridle (3) of the base section and the lowermost circular bridle (3) of the limiting section, the bridle cables (4) are installed layer by layer from top to bottom. After each layer of bridle cables (4) is installed, the temporary support structure of the adjacent circular bridle (3) below that layer of bridle cables (4) is removed, and then the bridle cables (4) are tensioned until the bridle cables (4) between the base (1) and the lowermost circular bridle (3) are installed.

7. The method for installing wind-resistant cables for a prestressed antenna tower crown according to claim 4, characterized in that: The base force transmission cable (5) located in the prefabricated segment is tensioned during the ground assembly stage, and the catwalk force transmission cable (4) between the prefabricated segments is tensioned in situ.

8. The method for installing wind-resistant cables for a prestressed antenna tower crown according to claim 4, characterized in that: In step five, the base section of the antenna main column (2) located in the base (1) is assembled together with the base (1) into a whole. During the assembly process, a temporary support is set under the elastic suspension layer (11) of the base (1), and it is removed immediately after the base (1) is assembled.

Images