Modularized collaborative anti-torsion reinforcing system for power transmission tower

Abstract

The invention discloses a power transmission tower modular collaborative anti-torsion reinforcing system. The invention relates to the technical field of power transmission line structure reinforcement, and aims to solve the problem of insufficient torsional rigidity of the upper part of an existing power transmission tower body. The system comprises section constraint modules arranged along a tower body at intervals and a longitudinal dowel bar system connected with the modules. The cross section restraining module locks four main materials of the same cross section through two main material fixing frames which are orthogonally overlapped, and rigid synergy of the multiple main materials on the same cross section is achieved. The longitudinal dowel bar system is a spatial triangular truss formed by welding a longitudinal connecting rod and an inclined stiffening rib. The core anti-torsion mechanism is as follows: when the upper part of the tower body is twisted, the section constraint module converts the twisting trend into shearing force and bending moment to the longitudinal connecting rod, and the internal force is transmitted through the longitudinal dowel bar system and redistributed to the lower structure of the tower body with higher rigidity to be jointly borne, so that the overall twisting is obviously inhibited. According to the system, through modular design, a clear force-weight distribution path is established in the tower body, and the structural safety and torsion resistance are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of power transmission line structure reinforcement technology, specifically providing a modular collaborative anti-torsion reinforcement system for power transmission towers. Background Technology

[0002] As large, tall truss structures, transmission towers are subjected to dynamic loads such as strong winds, asymmetric icing, and line breakage impacts over long periods. This easily induces harmful torsional deformation and vibration in the upper part of the tower, leading to loosening of joints, fatigue damage, and even local instability. This phenomenon is particularly pronounced in the upper part of the tower, where the cross-sectional dimensions are relatively small and the structure is relatively flexible. Currently, the main reinforcement methods used in engineering are traditional methods such as welding additional diagonal braces or welding steel plates. These methods are permanent invasive operations, which are not only difficult to construct and control in terms of quality, but the high temperature of welding can also damage the properties of the base material and introduce residual stress, and they cannot be flexibly adjusted. In addition, existing reinforcement concepts are mostly limited to the passive thinking of "strengthening local weak points" or "adding external supports," failing to start from the mechanical behavior of the overall structural system and fully utilize the inherent conical structure characteristics of the transmission tower, where the lower stiffness is much greater than that of the upper part, to actively design and implant an efficient internal load redistribution mechanism. This would enable the concentrated torque borne by the upper part to be actively and collaboratively transferred and distributed to the lower, stiffer tower structure and even the foundation. Therefore, there is an urgent need in this field for an innovative reinforcement technology that can achieve a thermally undamaged connection to the original tower structure, has modular, reversible, and adjustable construction advantages, and can establish a clear force flow path inside the tower through ingenious structural design, systematically realizing the longitudinal transmission and synergistic resistance of torque, thereby fundamentally improving the overall torsional resistance, safety margin, and economy of the transmission tower. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a modular, adjustable, and non-destructive transmission tower collaborative torsional reinforcement system. This system aims to solve the technical problem of insufficient torsional stiffness and susceptibility to harmful torsional deformation in existing transmission towers, particularly the upper part of the tower, under wind loads and conductor tension.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This invention relates to a modular collaborative anti-torsional reinforcement system for transmission towers, characterized in that it includes multiple cross-sectional constraint modules spaced apart along the height of the tower, and a longitudinal force transmission rod system connecting the cross-sectional constraint modules.

[0005] Furthermore, the cross-sectional constraint module is the core force-bearing and force-transmitting unit of the system, installed at each transverse diaphragm of the transmission tower body. Its function is to rigidly connect the four main transmission tower members (5) at the same cross-section into one unit and serve as anchor points for longitudinal force transmission. Specifically, the module is assembled from two main member fixing frames (2), an upper locking flange (3), a lower locking flange (6), a central connecting block (9), and a set of high-strength bolt connection pairs (4).

[0006] Furthermore, the main material fixing frame (2) is a rectangular rigid frame, which is a component that directly contacts the original structure. Its inner contour and spacing are precisely designed to fit tightly against the outer surface of the transmission tower main material (5), ensuring effective force transmission. Each section constraint module uses two main material fixing frames (2), which are orthogonally stacked at a 90-degree angle and initially connected to the transmission tower main material (5) through fasteners (such as bolts) set on their frames.

[0007] Furthermore, the upper locking flange (3) and the lower locking flange (6) are key components that constitute the module housing and provide assembly reference. Both are provided with limiting calipers (7) protruding towards their center, and the inner side of the limiting calipers (7) forms a precision guide groove. During installation, the two stacked main material fixing frames (2) are respectively accommodated in the limiting calipers (7) of the upper and lower locking flanges, thereby forming an effective circumferential constraint on them from the upper and lower sides, accurately limiting their radial displacement, and ensuring that the two main material fixing frames (2) move in coordination.

[0008] Furthermore, the central connecting block (9) is fixed to the center of the inner side of the upper locking flange (3) (or the lower locking flange (6)). In the assembled state, it fills the space between the central through holes of the two main material fixing frames (2), which plays a role in transmitting torsional force, enhancing the overall integrity of the module, and ensuring the coordinated displacement of the two main material fixing frames (2).

[0009] Furthermore, the high-strength bolted connection pair (4) is the final component that locks the module into a whole. It includes a central bolt and four peripheral bolts. The central bolt coaxially passes through the upper locking flange (3), the central connecting block (9), the two main material fixing frames (2), and the lower locking flange (6) along the module axis. The four peripheral bolts are arranged around the central bolt and pass through the corresponding parts of the upper locking flange (3), the limiting caliper (7), and the lower locking flange (6). By applying the designed preload to the entire set of bolts, all components are pressed into a high-rigidity whole that cannot be loosened, thereby ultimately achieving the rigid coordination of multiple transmission tower main materials (5) at the same cross-section.

[0010] Furthermore, the longitudinal force transmission system is the "skeleton" that connects cross-sections of different heights and enables the overall coordinated operation of the system. Its core function is to convert the torque borne by the upper tower body into internal forces within the system, and to transmit and redistribute these forces along the tower height. Due to the structural characteristics of the transmission tower, which is larger at the bottom and smaller at the top and fixed to the ground at the bottom, the upper part of the transmission tower is prone to torsional deformation. The longitudinal force transmission system can transfer the torque borne by the upper part of the transmission tower to the lower part for joint bearing, thereby significantly reducing the torsional deformation of the upper part of the transmission tower.

[0011] Furthermore, the longitudinal force transmission system includes multiple longitudinal connecting rods (1). Each longitudinal connecting rod (1) is fixed by welding to the reserved connection points of the main material fixing frame (2) in the cross-section constraint module at different elevations. In this way, all independent cross-section constraint modules are connected in series by the longitudinal connecting rods (1) into a spatial whole.

[0012] Furthermore, to significantly enhance the stability and in-plane stiffness of the rod system, diagonal stiffening ribs (8) are welded at intervals along the height direction between two adjacent longitudinal connecting rods (1). The longitudinal connecting rods (1) and the diagonal stiffening ribs (8) together form a stable spatial triangular truss structure, effectively preventing member instability and ensuring the reliability of the force transmission path.

[0013] Compared with the prior art, the significant advantages of this invention are as follows: A clear and efficient internal force redistribution path for the tower was established: the system creatively captures the torsional deformation of the tower through the section constraint module and transforms it into shear force and bending moment of the longitudinal connecting rod (1), which is resisted by the excellent shear and bending resistance of the rod. This shear force and bending moment are transferred and redistributed to the lower part of the tower with greater stiffness through the rigid rod system, realizing "load transfer" rather than "local hard resistance", with a clear mechanical path and a fundamental reinforcement mechanism.

[0014] The modular design provides excellent engineering adaptability: the entire system is assembled from standardized cross-section constraint modules and longitudinal force transmission rods. The number of installation layers, spacing, and number of longitudinal connecting rods of the cross-section constraint modules can be flexibly adjusted according to the tower type, size, and specific torsional reinforcement requirements of different transmission towers, making it highly versatile and adaptable to a wide range of applications.

[0015] A dual-mechanism structure constitutes a three-dimensional anti-torsional system: within a single cross-section, multiple main members are rigidly connected into a whole through cross-section constraint modules, achieving "intra-section coordination"; along the overall height of the tower, cross-section constraint modules at different elevations are linked in series through a longitudinal force transmission system, achieving "inter-section coordination". The combination of these two mechanisms forms a spatial three-dimensional anti-torsional reinforcement network from local to overall.

[0016] The system itself has a stable structure and high reliability: the limit caliper (7) and the central connecting block (9) ensure the assembly accuracy, integrity and force transmission reliability of the cross section constraint module; the spatial triangular truss formed by the longitudinal connecting rod (1) and the diagonal stiffening rib (8) greatly enhances the in-plane stiffness and stability of the longitudinal force transmission system under complex stress conditions, prevents the rod from becoming unstable and ensures that the force flow path is unobstructed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the cross-section constraint module of the present invention; Figure 4 This is a schematic diagram showing the relationship between the longitudinal connecting rod and the stiffening rib structure of the present invention; In the diagram: 1. Longitudinal connecting rod; 2. Main material fixing frame; 3. Upper locking flange; 4. High-strength bolt; 5. Main material of transmission tower; 6. Lower locking flange; 7. Limiting caliper; 8. Diagonal stiffening rib; 9. Center connecting block. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] 1. Component prefabrication Section constraint module components: First, based on the actual specifications of the main material (5) of the transmission tower, process and manufacture the main material fixing frame (2). Reserve connection points for welding with the longitudinal connecting rod (1) on the frame. Process the upper locking flange (3) and the lower locking flange (6) respectively, ensuring that the raised limit calipers (7) on their disc surfaces and all bolt holes are precisely machined. Prepare high-strength bolts, nuts and washers of the corresponding specifications and quantities to form a high-strength bolt connection pair (4).

[0020] Longitudinal force transmission rod assembly: According to the design length, cut rectangular steel sections as longitudinal connecting rods (1). Cut steel plates according to the design dimensions and angles, and fabricate diagonal stiffening ribs (8).

[0021] All steel components are coated with anti-corrosion paint in the factory, except for the welded connection area between the main material fixing frame (2) and the longitudinal connecting rod (1), which is left uncoated.

[0022] 2. Assembly Steps On-site preparation: Based on the design location, determine the installation cross-sectional diaphragms of each cross-section constraint module on the transmission tower body. Clean the anti-corrosion layer on the surface of the main material (5) of the transmission tower to ensure that the connection surface is clean and flat.

[0023] Section constraint module installation: a. At the selected transverse diaphragm, first temporarily fix the lower locking flange (6).

[0024] b. Place the two main material fixing frames (2) on the outside of the four main materials (5) of the transmission tower in this section, adjust the alignment so that the inner side is tightly attached to the surface of the main material, and use the mounting bolts to initially fix the main material fixing frames (2) and the main material (5).

[0025] c. Place the first main material fixing frame (2) into the guide groove formed by the limit caliper (7) of the lower locking flange (6), and then rotate the second main material fixing frame (2) 90 degrees and stack it on top of it.

[0026] d. Fasten the upper locking flange (3) with the center connecting block (9) welded on, so that the center connecting block (9) is embedded between the center through holes of the two main material fixing frames (2).

[0027] e. Install the high-strength bolted connection pair (4). First, coaxially pass the center bolt through the upper locking flange (3), the center connecting block (9), the two main material fixing frames (2), and the lower locking flange (6). Then, pass the four peripheral bolts through the upper locking flange (3), the limit caliper (7), and the lower locking flange (6). Tighten all the high-strength bolts according to the designed torque and sequence to compress the entire section constraint module into a high-rigidity whole. Complete the installation of the section constraint modules at all designed locations using this method.

[0028] Installation of longitudinal force transmission rod system: a. Hoist the longitudinal connecting rod (1) into position, aligning it with the pre-reserved connection point on the main material fixing frame (2) in each layer's cross-section constraint module. After adjustment and positioning, use welding technology to firmly weld and fix the longitudinal connecting rod (1) to the main material fixing frame (2) of each layer.

[0029] b. Weld diagonal stiffening ribs (8) between two adjacent longitudinal connecting rods (1) at the designed spacing. The longitudinal connecting rods (1) and the diagonal stiffening ribs (8) are connected by welding to form a stable spatial triangular truss structure.

[0030] c. Clean and inspect all on-site welds, and perform anti-corrosion repairs on the welded areas.

[0031] 3. Implementation Results After installation, the modular collaborative anti-torsional reinforcement system of the transmission tower is integrated with the tower body. When the tower body undergoes torsional deformation under wind load, the deformation is transmitted to the main member fixing frame (2) through the main member (5). Since the main member fixing frame (2) is rigidly connected by the upper and lower locking flanges (3,6), the central connecting block (9), and the high-strength bolt connection pair (4), and welded to the longitudinal connecting rod (1), the torsional tendency is converted into shear force and bending moment on the longitudinal connecting rod (1). This shear force and bending moment are transmitted and redistributed to the constraint modules of other sections of the lower part of the tower body through the spatial triangular truss system composed of the longitudinal connecting rod (1) and the diagonal stiffening ribs (8). With its greater stiffness and solidification with the foundation, the lower structure of the tower body effectively bears the load distributed from the upper part, thereby significantly suppressing the overall torsional deformation and improving the safety and durability of the transmission tower.

[0032] This invention is not limited to the above-described embodiments. Any modifications or improvements that can be conceived by those skilled in the art without departing from the essential content of this invention should fall within the protection scope of this invention.

Claims

1. A modular collaborative anti-torsional reinforcement system for transmission towers, characterized in that, It includes multiple cross-sectional constraint modules spaced apart along the height of the tower, and a longitudinal force transmission system connecting each of the cross-sectional constraint modules.

2. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 1, characterized in that, The cross-section constraint module includes two main material fixing frames (2), an upper locking flange (3), a lower locking flange (6), a central connecting block (9), and a set of high-strength bolt connection pairs (4), which are installed on each transverse diaphragm of the tower body.

3. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 2, characterized in that, The two main material fixing frames (2) are stacked at 90 degrees orthogonal, and their frames are connected to the main material (5) of the transmission tower by fasteners.

4. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 2, characterized in that, The upper locking flange (3) and the lower locking flange (6) are provided with limiting calipers (7) protruding towards their center. The limiting calipers (7) form circumferential constraints on the stacked main material fixing frame (2) from the upper and lower sides.

5. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 2, characterized in that, The central connecting block (9) is fixed to the inner side of the upper locking flange (3) or the lower locking flange (6) and fills the space between the central through holes of the two main material fixing frames (2).

6. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 2, characterized in that, The high-strength bolt group (4) includes a central bolt and four peripheral bolts; the central bolt coaxially passes through the upper locking flange (3), the central connecting block (9), the two main material fixing frames (2) and the lower locking flange (6); the four peripheral bolts are arranged around the central bolt and pass through the upper locking flange (3), the limit caliper (7) and the lower locking flange (6).

7. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 2, characterized in that, The inner side of the limiting caliper (7) forms a guide groove for limiting the radial displacement of the main material fixing frame (2).

8. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 1, characterized in that, The longitudinal force transmission rod system includes multiple longitudinal connecting rods (1), and each of the longitudinal connecting rods (1) is welded and fixed to the main material fixing frame (2) in the cross-section constraint module at different heights.

9. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 8, characterized in that, An oblique stiffening rib (8) is welded between two adjacent longitudinal connecting rods (1), and the longitudinal connecting rods (1) and the oblique stiffening ribs (8) together form a spatial triangular truss structure.

10. The modular collaborative anti-torsional reinforcement system for transmission towers according to claim 2, characterized in that, The main material fixing frame (2) is a rectangular rigid frame whose inner contour matches the outer surface of the main material (5) of the transmission tower.

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