A parallel loading device for loads in transmission line tower tests

Abstract

The application relates to the technical field of power transmission lines, and particularly discloses a load parallel loading device in a power transmission line tower test, which comprises a front supporting beam, a rear supporting beam, V-string steel wire ropes and main loading steel wire ropes, a plurality of supporting beam connecting plates are welded on the front supporting beam and the rear supporting beam, supporting connecting rods are jointly arranged between adjacent supporting beam connecting plates through bolts, and beam supporting rings I are fixedly connected to the two ends of the front supporting beam. The front and rear supporting beams and the multiple intersectingly arranged supporting connecting rods form multiple triangular stable structures, the overall rigidity and stability of the device are greatly enhanced, and the problem of supporting force reduction caused by the large opening of the tower and the excessively large slenderness ratio of the supporting beam is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of power transmission line technology, and in particular to a parallel loading device for power transmission line tower testing. Background Technology

[0002] In the power industry, full-scale testing of transmission line towers is a crucial step in verifying their structural performance and load-bearing capacity. The tests simulate various loads experienced by the towers during actual operation, including wind loads from the conductors on both sides.

[0003] Currently, V-shaped insulator strings combined with steel wire ropes are commonly used for wind load application. However, directly using V-shaped strings for loading has inherent drawbacks: when a load is applied to the apex of the V-shaped string, its two arms naturally converge towards the center, forming an unstable geometric system. This convergence tendency generates an additional horizontal inward component force on the suspension point of the test tower, introducing additional internal stress beyond the pre-set experimental parameters. This additional stress alters the actual stress state of the tower, causing deviations between the experimental conditions and the theoretical design conditions, thus severely affecting the accuracy of the assessment of the tower's true load-bearing capacity.

[0004] To address the V-shaped support structure closure issue, existing technologies typically employ an independent support beam added in front of the V-shaped support to pre-open its apex, aiming to ensure that the loads acting on both sides of the tower are ultimately parallel. However, this method has limitations: when the tower opening width is large, the required support beam length increases significantly, resulting in an excessively high slenderness ratio. An excessively high slenderness ratio severely weakens the bending stiffness and stability of the support beam. Under high test loads, the support beam itself will exhibit significant deflection or even instability, failing to effectively maintain the predetermined opening distance, causing a further loss of load parallelism and a significant reduction in support effectiveness. Utility Model Content

[0005] The purpose of this invention is to provide a parallel loading device for transmission line tower tests, which solves the problem of insufficient bending stiffness and stability in the existing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a parallel loading device for transmission line tower testing, comprising a front support beam, a rear support beam, a V-string steel wire rope, and a main loading steel wire rope. Multiple support beam connecting plates are welded onto both the front and rear support beams. Adjacent support beam connecting plates are connected by bolts to a support connecting rod. A beam support ring is fixedly connected to both ends of the front support beam, and a support connecting U-shaped ring is installed on the beam support ring. A second beam support ring is fixedly connected to both ends of the rear support beam, and a second support connecting U-shaped ring is installed on the beam support ring. A V-string steel wire rope is slidably connected between the upper and lower support connecting U-shaped rings. Loading U-shaped rings are fixedly connected to both ends of the main loading steel wire rope, and the middle section of the V-string steel wire rope is wound around the outside of the loading U-shaped rings.

[0007] Preferably, the front support beam and the rear support beam are arranged in parallel, and the length of the front support beam is shorter than that of the rear support beam. The front support beam and the rear support beam are arranged in parallel front to back, and form a certain slope between them to facilitate coordination with the V-shaped arrangement of the V-string steel wire rope.

[0008] Preferably, both the front and rear support beams are hollow rectangular tubes. The front and rear support beams form the main body of the device and serve a load-bearing function.

[0009] Preferably, multiple supporting connecting rods are provided and arranged in an alternating manner. Several supporting connecting rods and supporting beam connecting plates connect the front supporting beam and the rear supporting beam to form multiple triangular stable structures.

[0010] Preferably, a connecting sleeve is fixedly connected to the loading U-shaped ring, and multiple guide wheels are installed on the outer ring wall of the connecting sleeve. The guide wheels are in contact with the V-string steel wire rope. By setting a combination of multiple guide wheels, the friction at the inflection point of the V-string steel wire rope can be reduced, and the force concentration can be avoided.

[0011] Preferably, both ends of the V-string steel wire rope are fixedly connected to auxiliary loading steel wire ropes. The auxiliary loading steel wire ropes are used to install at the loading points on both sides of the experimental tower.

[0012] Preferably, the end of the auxiliary loading wire rope is fixedly connected to a mounting U-shaped ring. The mounting U-shaped ring is used for connection with the loading point.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model forms multiple triangular stable structures by means of front and rear support beams and multiple staggered support connecting rods, which greatly enhances the overall rigidity and stability of the device and effectively avoids the problem of reduced support force caused by large tower openings and excessive slenderness ratio of support beams.

[0015] 2. This utility model uses a sliding loading U-shaped ring to cooperate with V-string steel wire ropes, and innovatively sets a connecting sleeve with a guide wheel on the loading U-shaped ring, which changes the traditional fixed contact to rolling contact, greatly reducing friction and local stress concentration, and ensuring that the load is evenly transmitted between multiple steel wire ropes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This utility model Figure 1 Local structural magnification Figure 1 ;

[0018] Figure 3 This utility model Figure 1 Local structural magnification Figure 2 .

[0019] In the diagram: 1. Front support beam; 2. Rear support beam; 3. Support beam connecting plate; 4. Support connecting rod; 5. Beam support ring one; 6. Support connecting U-shaped ring one; 7. Beam support ring two; 8. Support connecting U-shaped ring two; 9. V-string steel wire rope; 10. Secondary loading steel wire rope; 11. Installation U-shaped ring; 12. Main loading steel wire rope; 13. Loading U-shaped ring; 131. Connecting sleeve; 132. Guide wheel. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-3 A parallel loading device for transmission line tower testing includes a front support beam 1, a rear support beam 2, a V-string steel wire rope 9, and a main loading steel wire rope 12. The front support beam 1 and the rear support beam 2 are arranged in parallel, with the length of the front support beam 1 being shorter than that of the rear support beam 2. The front support beam 1 and the rear support beam 2 are arranged in parallel front to back, forming a certain slope between them to facilitate the V-shaped arrangement of the V-string steel wire rope 9. Both the front support beam 1 and the rear support beam 2 are hollow rectangular tubes. The front support beam 1 and the rear support beam 2 form the main body of the device and serve as the load-bearing structure. Multiple support beam connecting plates 3 are welded onto both the front support beam 1 and the rear support beam 2. Adjacent support beam connecting plates 3 are connected by bolts to support connecting rods 4. Multiple support connecting rods 4 are provided and are staggered. Several support connecting rods 4 and support beam connecting plates 3 connect the front support beam 1 and the rear support beam 2 to form multiple triangular stable structures.

[0022] Please see Figures 1-3 Both ends of the front support beam 1 are fixedly connected to beam support ring 5, and a support connecting U-shaped ring 6 is installed on beam support ring 5. Both ends of the rear support beam 2 are fixedly connected to beam support ring 7, and a support connecting U-shaped ring 8 is installed on beam support ring 7. A V-string steel wire rope 9 is slidably connected between the upper and lower support connecting U-shaped rings 6 and support connecting U-shaped rings 8. Both ends of the main loading steel wire rope 12 are fixedly connected to loading U-shaped rings 13, and the middle section of the V-string steel wire rope 9 is wound around the outside of the loading U-shaped rings 13. A connecting sleeve 131 is fixedly connected to the loading U-shaped ring 13, and multiple guide wheels 132 are installed on the outer ring wall of the connecting sleeve 131. The guide wheels 132 are in contact with the V-string steel wire rope 9. By setting multiple guide wheels 132, the friction at the inflection point of the V-string steel wire rope 9 can be reduced, and the force concentration can be avoided. Both ends of the V-string steel wire rope 9 are fixedly connected to auxiliary loading steel wire ropes 10. The auxiliary loading wire rope 10 is used to install at the loading points on both sides of the experimental tower. A U-shaped ring 11 is fixedly connected to the end of the auxiliary loading wire rope 10. The U-shaped ring 11 is used for connection to the loading point.

[0023] The specific implementation process of this utility model is as follows: First, pre-assemble on the ground, placing the front support beam 1 and the rear support beam 2 in parallel, ensuring that the front support beam 1 is located in front of the rear support beam 2, forming a stable slope. Then, fix the two ends of multiple support connecting rods 4 to the support beam connecting plates 3 welded to the front support beam 1 and the rear support beam 2 respectively using bolts. The support connecting rods 4 should be arranged crosswise, forming multiple solid triangular stable structures together with the front support beam 1 and the rear support beam 2. This is the core of the entire device's force bearing. Next, install the support connecting U-shaped rings 6 on the beam support rings 5 ​​at both ends of the front support beam 1, and install the support connecting U-shaped rings 8 on the beam support rings 7 at both ends of the rear support beam 2. Then, fix the two ends of the V-string steel wire rope 9 to the support connecting U-shaped rings 8 at both ends of the lower rear support beam 2 respectively, and then pass it upward through the upper front support. The support rings 6 at both ends of the support beam 1 form a natural V-shaped structure. Then, the loading U-shaped rings 13 at both ends of the main loading wire rope 12 are used to hold the middle section of the V-string wire rope 9 from below. The key improvement is that the connecting sleeve 131 and the guide wheel 132 arranged around the circumference on the loading U-shaped ring 13 will form rolling contact with the V-string wire rope 9. This allows the loading U-shaped ring 13 to slide smoothly along the V-string wire rope 9 in a small range during the loading process, automatically adjusting to the force balance position, thereby avoiding stress concentration and ensuring uniform load distribution. Finally, the device is installed on the test tower, and the installation U-shaped rings 11 at the ends of the auxiliary loading wire ropes 10 led out from both ends of the V-string wire rope 9 are fixed to the preset loading points on both sides of the test tower. After checking all connection points and confirming that there are no errors, the test load can be applied through the main loading wire rope 12.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A parallel loading device for transmission line tower testing, comprising a front support beam (1), a rear support beam (2), a V-string steel wire rope (9), and a main loading steel wire rope (12), characterized in that: Multiple support beam connecting plates (3) are welded to both the front support beam (1) and the rear support beam (2). Support connecting rods (4) are bolted together between adjacent support beam connecting plates (3). Beam support ring one (5) is fixedly connected to both ends of the front support beam (1). Support connecting U-shaped ring one (6) is installed on the beam support ring one (5). Beam support ring two (7) is fixedly connected to both ends of the rear support beam (2). Support connecting U-shaped ring two (8) is installed on the beam support ring two (7). V-string steel wire rope (9) is slidably connected between the upper and lower support connecting U-shaped ring one (6) and support connecting U-shaped ring two (8). Loading U-shaped rings (13) are fixedly connected to both ends of the main loading steel wire rope (12). The middle section of the V-string steel wire rope (9) is wound around the outside of the loading U-shaped ring (13).

2. The parallel loading device for transmission line tower testing according to claim 1, characterized in that: The front support beam (1) and the rear support beam (2) are arranged in parallel, and the length of the front support beam (1) is less than that of the rear support beam (2).

3. The parallel loading device for transmission line tower testing according to claim 1, characterized in that: Both the front support beam (1) and the rear support beam (2) are hollow rectangular tubes.

4. The parallel loading device for transmission line tower testing according to claim 1, characterized in that: The support connecting rod (4) is provided in multiple ways and is arranged in an alternating manner.

5. The parallel loading device for transmission line tower testing according to claim 1, characterized in that: A connecting sleeve (131) is fixedly connected to the loading U-shaped ring (13). Multiple guide wheels (132) are installed on the outer ring wall of the connecting sleeve (131). The guide wheels (132) are in contact with the V-string steel wire rope (9).

6. The parallel loading device for transmission line tower testing according to claim 1, characterized in that: Both ends of the V-string steel wire rope (9) are fixedly connected to auxiliary loading steel wire ropes (10).

7. The parallel loading device for transmission line tower testing according to claim 6, characterized in that: The end of the auxiliary loading wire rope (10) is fixedly connected to an installation U-shaped ring (11).

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