Gravity self-balancing type cable lightning protection lightning receiving belt mounting structure

Abstract

The utility model discloses a gravity self-balancing type cable lightning protection lightning receiving belt mounting structure, which is characterized in that a plurality of lightning receiving belt mounting pieces are provided with cable sleeve fixing parts and lightning receiving belt fixing parts, and are fixedly mounted on a cable sleeve through the cable sleeve fixing parts; and the lightning receiving belts are fixedly mounted on the lightning receiving belt fixing parts of the lightning receiving belt mounting pieces. Each lightning receiving belt mounting piece is also provided with a counterweight fixing part, and the counterweight fixing part and the lightning receiving belt fixing part are positioned in two opposite directions on the lightning receiving belt mounting piece; the counterweight belt is fixedly mounted on the counterweight fixing part of each lightning receiving belt mounting piece, so that the counterweight belt is suspended and mounted right below the cable through all the counterweight fixing parts and is arranged along the trend of the cable; and the counterweight belt is used for automatically applying a reset acting force to the lightning receiving belt by using the gravity of the counterweight belt when the lightning receiving belt deflects. According to the utility model, the mechanical balance and self-correction functions are realized through the counterweight belt, and the attitude stability and the lightning protection efficiency of the lightning receiving belt in a complex environment are ensured.

Description

Technical Field

[0001] This utility model relates to an improvement in the installation method of lightning protection strips, specifically to a gravity self-balancing cable lightning protection strip installation structure, which is suitable for wind and earthquake resistance and the installation of gravity self-balancing cable lightning protection strips in tall structures such as bridges and towers, and belongs to the field of building lightning protection technology. Background Technology

[0002] Lightning protection is a basic requirement for many public buildings, especially high-rise buildings and buildings with tall structures on their roofs, where the risk of lightning strikes is high, making lightning protection measures essential. Modern bridges come in many types, among which suspension bridges and cable-stayed bridges include pylons and cable structures in their main structure. Pylons are tall structures. When installing lightning protection facilities on these bridges, lightning conductors are often fixed to the cables. These conductors then conduct the lightning current to the ground through down conductors, thus achieving lightning protection.

[0003] Existing bridge cable lightning protection strip installation structure, such as Figure 1 , Figure 2 and Figure 3 As shown, several spaced clamps 2 are used to fix the lightning protection strip 1 to the sleeve 5 outside the cable 3. The lower part of the clamp 2 is tightly wrapped around the cable sleeve 5. The clamp 2 has a vertically upward lightning protection strip mounting bracket, and the lightning protection strip 1 is installed on the upper end of the mounting bracket and fixed by bolts 7. With the support of multiple clamps, the lightning protection strip is installed parallel to the cable direction and directly above the cable. The existing cable lightning protection strip installation method has the following shortcomings:

[0004] 1. Gravity imbalance: The clamp fixation causes uneven gravity distribution, and the cable sleeve is prone to circumferential rotation (offset angle ≥15°).

[0005] 2. Deterioration of dynamic response: Vibrations from vehicles traveling on the bridge surface and wind vibrations (≥8m / s) can easily induce alternating torque, with a deviation rate of up to 67% under strong wind conditions.

[0006] 3. High maintenance costs: The lightning protection effect will be affected after the lightning protection strip rotates with the cable sleeve. Therefore, it needs to be corrected by operators. On average, 2-3 correction operations are required per year. It has the risk of working at height and the cost of a single maintenance exceeds 10,000 yuan.

[0007] Although some solutions attempt to add auxiliary fasteners, they do not fundamentally solve the mechanical balance problem: for example, simply increasing the number of clamps can easily lead to stress concentration and accelerate the wear of the cable sheath; adding a spring reset mechanism is prone to corrosion failure in outdoor environments, with a service life of less than 3 years. Utility Model Content

[0008] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to propose a gravity self-balancing cable lightning protection strip installation structure. This utility model ensures the attitude stability and lightning protection performance of the lightning protection strip in complex environments through mechanical balance design and self-correction function.

[0009] The technical solution of this utility model is implemented as follows:

[0010] A gravity-balanced cable lightning arrester installation structure includes several lightning arrester installation components. Each component has a cable sleeve fixing part and a lightning arrester fixing part. These components are fixedly mounted on the cable sleeve via the cable sleeve fixing parts and are spaced apart. The lightning arrester is fixedly mounted on the lightning arrester fixing part of each component, suspending and supporting the lightning arrester directly above the cable and along the cable's direction. The structure also includes a counterweight belt. Each component has a counterweight fixing part, located in opposite directions on the component. The counterweight belt is fixedly mounted on the counterweight fixing part of each component, suspending it directly below the cable and along the cable's direction. The counterweight belt automatically applies a restoring force to the lightning arrester using its own weight when the lightning arrester deflects.

[0011] Preferably, the weight of the counterweight belt is 1.1-1.3 times the weight of the lightning protection belt.

[0012] Furthermore, the cable sleeve fixing part is a clamp, the lightning protection belt fixing part is an upper fixing rod, the lower end of the upper fixing rod is fixedly connected to the clamp, and the lightning protection belt is fixedly installed on the upper end of the upper fixing rod; the counterweight fixing part is a lower fixing rod, the upper end of the lower fixing rod is fixedly connected to the clamp, and the counterweight belt is fixedly installed on the lower end of the lower fixing rod; the upper fixing rod and the lower fixing rod are located on the same straight line and the straight line passes through the center of the clamp.

[0013] Furthermore, the clamp is formed by two semi-rings closing together, each semi-ring having connecting portions extending radially outward at both ends. The two semi-rings are fixed to the cable sleeve by the connecting portions at both ends under the connection of the connector; one of the two upward connecting portions of the two semi-rings extends further upward to form the upper fixing rod, and one of the two downward connecting portions of the two semi-rings extends further downward to form the lower fixing rod.

[0014] Furthermore, the upper fixing rod extends upward on one of the connecting portions with the upper half-ring facing upward, and the lower fixing rod extends downward on the connecting portion with the lower half-ring facing downward.

[0015] Preferably, the upper end of the upper fixing rod is bent to one side and then bent downward to form a downward-facing flashing tape groove at the upper end of the upper fixing rod. The flashing tape is located in the flashing tape groove, and the two side walls of the flashing tape groove are fixedly connected by bolts and nuts to lock the opening of the flashing tape groove.

[0016] The lower end of the lower fixing rod is bent to one side and then bent upward to form an upward-facing counterweight belt groove at the lower end of the lower fixing rod. The counterweight belt is located in the counterweight belt groove, and the two side walls of the counterweight belt groove are fixedly connected by bolts and nuts to lock the opening of the counterweight belt groove.

[0017] Furthermore, the flash-catching belt slot is located on the left / right side of the upper fixing rod; the counterweight belt slot is located on the right / left side of the lower fixing rod.

[0018] Preferably, the inner side of the clamp is provided with anti-slip teeth to increase the friction between the clamp and the cable sleeve.

[0019] More preferably, the anti-slip serration has a tooth depth of 0.5 mm and a tooth pitch of 2 mm, which increases the coefficient of friction by 40%.

[0020] Preferably, the outer diameter of the clamp is 2r, the distance between the upper end of the upper fixing rod and the clamp is r, and the distance between the lower end of the lower fixing rod and the clamp is 1.5r.

[0021] This invention adds a counterweight belt, which is suspended directly below the lightning protection cable. When the lightning protection cable sways due to vibration or wind, the counterweight belt will also sway in the opposite direction to the lightning protection cable. Once the external factors affecting the sway are eliminated, the counterweight belt, due to its own weight, always points downwards, effectively pulling the lightning protection cable mounting components back to their original position, thus automatically resetting the lightning protection cable. This invention achieves mechanical balance and self-correction through the counterweight belt, ensuring the stability of the lightning protection cable and its lightning protection effectiveness in complex environments.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Significantly improved stability: The critical wind resistance speed of this installation structure is ≥25m / s, the offset rate under various vibration environments is ≤5%, and the automatic reset accuracy after offset is ±2°.

[0024] 2. Reduced maintenance costs: The maintenance cycle is extended to 5 years, and the total life cycle maintenance cost is reduced by more than 50%. Attached Figure Description

[0025] Figure 1 - Existing technology cable lightning protection strip installation diagram;

[0026] Figure 2 - Existing technology cable lightning protection strip installation cross section;

[0027] Figure 3 - Front view of existing cable lightning protection strip installation;

[0028] Figure 4 - Schematic diagram of the installation of the cable lightning protection strip of this utility model;

[0029] Figure 5 - Cross-sectional view of the installation of the cable lightning protection strip of this utility model;

[0030] Figure 6 - Front view of the installation of the cable lightning protection strip of this utility model.

[0031] In the diagram: lightning arrestor belt-1, clamp-2, cable-3, counterweight belt-4, cable sleeve-5, cable strand-6, bolt-7, upper fixing rod-8, lower fixing rod-9. Detailed Implementation

[0032] The implementation method and principle of this utility model will be further described in detail below with reference to the accompanying drawings.

[0033] See Figures 4-6 This utility model discloses a gravity-based self-balancing cable lightning protection lightning arrester installation structure, comprising several lightning arrester installation components. Each lightning arrester installation component has a cable sleeve fixing part and a lightning arrester fixing part. The several lightning arrester installation components are fixedly installed on a cable sleeve 5 via the cable sleeve fixing part and are spaced apart on the cable sleeve (at intervals of d). The lightning arrester 1 is fixedly installed on the lightning arrester fixing part of each lightning arrester installation component, so that the lightning arrester 1 is suspended and supported directly above the cable 3 by all the lightning arrester fixing parts and is arranged along the cable direction. To achieve self-balancing, this utility model also includes a counterweight belt 4. Each lightning arrester installation component also has a counterweight fixing part, and the counterweight fixing part and the lightning arrester fixing part are located in opposite directions on the lightning arrester installation component. The counterweight belt 4 is fixedly installed on the counterweight fixing part of each lightning protection belt mounting part so that the counterweight belt 4 is suspended directly below the cable 3 and set along the cable direction through all the counterweight fixing parts; the counterweight belt is used to automatically apply a restoring force to the lightning protection belt by its own weight when the lightning protection belt deflects.

[0034] Since both the counterweight belt 4 and the lightning-absorbing belt 1 are installed on the lightning-absorbing belt mounting bracket, and the counterweight belt is suspended directly below the cable 3 (labeled 6 as the strands constituting the cable), when the lightning-absorbing belt 1 sways due to vibration or wind, the counterweight belt 4 will also be driven to sway in the opposite direction to the lightning-absorbing belt 1. When the external factors affecting the sway are eliminated, the counterweight belt 4, due to its own weight, always points downwards, which is equivalent to pulling the lightning-absorbing belt mounting bracket downwards to reset, thereby automatically resetting the lightning-absorbing belt 1.

[0035] In theory, as long as there is a counterweight belt, there will be an automatic reset force. Since the setting of the counterweight belt will increase the load on the cable and bridge, it should not be too heavy. However, if it is too light, the automatic reset effect will not be obvious. Taking all factors into consideration, the weight of the counterweight belt 4 of this utility model is preferably 1.1-1.3 times the weight of the lightning protection belt 1. In this way, the reliable reset effect of the lightning protection belt is achieved while minimizing this additional load.

[0036] To simplify the structure of the lightning arrester installation components and facilitate installation, in this embodiment, the cable sleeve fixing part is a clamp 2, and the lightning arrester fixing part is an upper fixing rod 8. The lower end of the upper fixing rod 8 is fixedly connected to the clamp 2, and the lightning arrester 1 is fixedly installed on the upper end of the upper fixing rod 8. The counterweight fixing part is a lower fixing rod 9, the upper end of the lower fixing rod 9 is fixedly connected to the clamp 2, and the counterweight belt 4 is fixedly installed on the lower end of the lower fixing rod 9; the upper fixing rod 8 and the lower fixing rod 9 are located on the same straight line, and this straight line passes through the center of the clamp.

[0037] Furthermore, to facilitate the installation of the lightning arrester on the cable sleeve, the clamp is formed by two semi-rings closing together. Each semi-ring has connecting portions extending radially outward at both ends. The two semi-rings are fixed to the cable sleeve by connecting parts (such as bolts and nuts) at both ends. One of the two upward-facing connecting portions of the two semi-rings further extends upward to form the upper fixing rod 8, and one of the two downward-facing connecting portions of the two semi-rings further extends downward to form the lower fixing rod 9. In this way, the upper and lower fixing rods and the semi-rings are integrally formed, resulting in a simple structure and convenient processing.

[0038] The upper fixing rod extends upward from the connecting part of one of the semi-rings facing upward, and the lower fixing rod extends downward from the connecting part of the other semi-ring facing downward. In this way, the upper and lower fixing rods are located on different semi-rings, and the two semi-rings have the same structure, which facilitates the production and management of the semi-rings.

[0039] To facilitate the installation of the lightning catcher strip, the upper end of the upper fixing rod is bent to one side and then bent downwards to form a downward-facing lightning catcher strip slot at the upper end of the upper fixing rod. The lightning catcher strip is located within the lightning catcher strip slot, and the two side walls of the lightning catcher strip slot are fixedly connected by bolts and nuts to lock the opening of the lightning catcher strip slot. The upper fixing rod and the slot it forms constitute the lightning catcher strip fixing part. The bent part at the upper end of the upper fixing rod has a certain degree of elasticity, thus forming an elastic slot, which facilitates the widening of the slot opening when installing the lightning catcher strip. At the same time, the elastic bent part acts as an elastic washer, which has a certain anti-loosening effect on the locking nut. The slot can be rectangular, arc-shaped, or triangular as shown in the figure. There is no specific limitation, as long as it facilitates the installation of the lightning catcher strip and is conducive to the bolt connection and closure.

[0040] Similarly, the lower end of the lower fixing rod is bent to one side and then bent upward to form an upward-opening counterweight belt groove at the lower end of the lower fixing rod. The counterweight belt is located in the counterweight belt groove, and the two side walls of the counterweight belt groove are fixedly connected by bolts and nuts to lock the opening of the counterweight belt groove.

[0041] Preferably, the lightning arresting belt slot is located on the left / right side of the upper fixing rod; the counterweight belt slot is located on the right / left side of the lower fixing rod. This symmetrical arrangement of the lightning arresting belt slot and the counterweight belt slot relative to the cable center ensures that the left and right halves of the ring are essentially identical in structure, facilitating production and management.

[0042] The inner side of the clamp (two half rings) is provided with anti-slip teeth to increase the friction between the clamp and the cable sleeve. On the one hand, this better enables the clamp to be fixedly installed on the sleeve, and on the other hand, it makes the lightning protection belt more wind-resistant and earthquake-resistant, because when the lightning protection belt deflects, it will drive the sleeve to rotate together, which greatly increases the required rotation torque.

[0043] In this embodiment, the anti-slip serration has a tooth depth of 0.5 mm and a tooth pitch of 2 mm, which increases the coefficient of friction by 40%.

[0044] In this embodiment, the outer diameter of the clamp is 2r, the distance between the upper end of the upper fixing rod and the clamp is r, and the distance between the lower end of the lower fixing rod and the clamp is 1.5r. This dimensional design ensures that after the counterweight belt and the lightning-catching belt are installed, the distance between the counterweight belt and the center of the sleeve is greater than the distance between the lightning-catching belt and the center of the sleeve, which is more conducive to achieving self-resetting.

[0045] This installation structure mainly involves three parts: lightning protection belt, counterweight belt, and fixed installation components.

[0046] 1. Lightning receiver

[0047] Material: The lightning protection strip is made of 304 stainless steel or round steel with a cross-sectional area ≥ 50mm². It meets the requirements of GB50057 "Code for Design of Lightning Protection of Buildings" and GB / T31067 "Technical Code for Lightning Protection of Bridges".

[0048] Structure: The lightning protection strip is composed of a continuously bent conductive metal strip, with stress diffusion bends at the bends. The radius of curvature of the bend is R=1.5D, where D is the diameter of the cable sheath; the bend angle is 135°±5°, integrating stress diffusion design.

[0049] 2. Counterweight belt

[0050] Mass ratio: Q=1.25±0.05 (weight ratio of counterweight belt to lightning protection belt);

[0051] Material: The counterweight belt is made of round steel or flat steel, and the symmetrical layout achieves automatic gravity balance with a torque difference of ≤5N·m.

[0052] 3. Fixing components (clamps, fixing rods, slots, bolts, and nuts)

[0053] The double-ring constraint clamp achieves circumferential fixation through graded torque control. The contact pressure applied by the double-ring constraint clamp is 20-35 N·m.

[0054] The clamp features an anti-slip toothed design (tooth depth 0.5mm, tooth pitch 2mm), increasing the coefficient of friction by 40%.

[0055] In addition, to prevent corrosion, the materials involved in this utility model also include anti-corrosion coatings or 316L stainless steel options, which can be used in coastal and chemical highly corrosive environments.

[0056] In summary, this utility model solves the three major technical problems of existing cable lightning protection strips through the above improvements:

[0057] Eliminating gravitational imbalance: Achieving neutral balance of the gravitational field through symmetrical counterweight design (torque difference ≤ 5 N·m);

[0058] Improve wind and earthquake resistance (increase critical wind speed from 8m / s to 25m / s).

[0059] The adaptive reset function greatly reduces the frequency of manual intervention and significantly saves maintenance costs.

[0060] Finally, it should be noted that the above examples of this utility model are merely illustrative and not intended to limit the implementation of this utility model. Although the applicant has described this utility model in detail with reference to preferred embodiments, those skilled in the art can make other variations and modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A gravity-balanced cable lightning protection lightning arrester installation structure, comprising several lightning arrester installation components, each having a cable sleeve fixing part and a lightning arrester fixing part. The several lightning arrester installation components are fixedly installed on the cable sleeve via the cable sleeve fixing part and are spaced apart on the cable sleeve. The lightning arrester is fixedly installed on the lightning arrester fixing part of each lightning arrester installation component so that the lightning arrester is suspended and supported directly above the cable by all the lightning arrester fixing parts and is arranged along the cable direction; characterized in that: It also includes a counterweight belt, and each lightning protection belt mounting component has a counterweight fixing part, with the counterweight fixing part and the lightning protection belt fixing part located in opposite directions on the lightning protection belt mounting component; the counterweight belt is fixedly installed on the counterweight fixing part of each lightning protection belt mounting component so that the counterweight belt is suspended directly below the cable and set along the cable direction through all the counterweight fixing parts; the counterweight belt is used to automatically apply a restoring force to the lightning protection belt by its own weight when the lightning protection belt deflects.

2. The gravity self-balancing cable lightning protection strip installation structure according to claim 1, characterized in that: The weight of the counterweight belt is 1.1-1.3 times the weight of the lightning protection belt.

3. The gravity self-balancing cable lightning protection strip installation structure according to claim 1, characterized in that: The cable sleeve fixing part is a clamp, the lightning protection belt fixing part is an upper fixing rod, the lower end of the upper fixing rod is fixedly connected to the clamp, and the lightning protection belt is fixedly installed on the upper end of the upper fixing rod; the counterweight fixing part is a lower fixing rod, the upper end of the lower fixing rod is fixedly connected to the clamp, and the counterweight belt is fixedly installed on the lower end of the lower fixing rod; the upper fixing rod and the lower fixing rod are located on the same straight line and the straight line passes through the center of the clamp.

4. The gravity self-balancing cable lightning protection strip installation structure according to claim 3, characterized in that: The clamp is formed by two semi-rings closing together, each semi-ring having connecting parts extending radially outward at both ends. The two semi-rings are fixed to the cable sleeve by the connecting parts at both ends and the connection of the connector. One of the two connecting parts of the two semi-rings facing upward extends further upward to form the upper fixing rod, and one of the two connecting parts of the two semi-rings facing downward extends further downward to form the lower fixing rod.

5. The gravity self-balancing cable lightning protection strip installation structure according to claim 4, characterized in that: The upper fixing rod extends upward on one of the connecting parts with the upper half ring facing upward, and the lower fixing rod extends downward on the connecting part with the lower half ring facing downward.

6. The gravity self-balancing cable lightning protection strip installation structure according to claim 3, characterized in that: The upper end of the upper fixing rod is bent to one side and then bent downward to form a downward-facing flash receiving tape slot at the upper end of the upper fixing rod. The flash receiving tape is located in the flash receiving tape slot. The two side walls of the flash receiving tape slot are fixedly connected by bolts and nuts to lock the opening of the flash receiving tape slot. The lower end of the lower fixing rod is bent to one side and then bent upward to form an upward-facing counterweight belt groove at the lower end of the lower fixing rod. The counterweight belt is located in the counterweight belt groove, and the two side walls of the counterweight belt groove are fixedly connected by bolts and nuts to lock the opening of the counterweight belt groove.

7. The gravity self-balancing cable lightning protection strip installation structure according to claim 6, characterized in that: The flash-catching belt slot is located on the left / right side of the upper fixing rod; the counterweight belt slot is located on the right / left side of the lower fixing rod.

8. The gravity self-balancing cable lightning protection strip installation structure according to claim 3, characterized in that: The inner side of the clamp is provided with anti-slip teeth to increase the friction between the clamp and the cable sleeve.

9. The gravity self-balancing cable lightning protection strip installation structure according to claim 8, characterized in that: The anti-slip serrations have a tooth depth of 0.5mm and a tooth pitch of 2mm, increasing the coefficient of friction by 40%.

10. The gravity self-balancing cable lightning protection strip installation structure according to claim 3, characterized in that: The outer diameter of the clamp is 2r, the distance between the upper end of the upper fixing rod and the clamp is r, and the distance between the lower end of the lower fixing rod and the clamp is 1.5r.

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