CN-122014017-A - Uninterrupted main material replacement method suitable for mountain falling stone damaged transmission tower

Abstract

The invention relates to the technical field of operation and maintenance of transmission lines, and discloses a method for replacing uninterrupted main materials of a power transmission tower which is damaged by falling rocks in mountain areas, which comprises the steps of firstly, establishing a protection bent frame with a mechanical trigger in a dangerous rock area, and constructing an induction linkage defense system through a signal cable linkage tower body locking module; A bypass channel is established by utilizing the anchor ear of the lining friction coating and the rigid-flexible coupling prestress node, the load of the damaged main material is smoothly transferred to the auxiliary main material and then removed, then a new main material of the prefabricated micro-channel is installed, epoxy structural adhesive is injected, the new and old components are connected without gaps, and finally temporary facilities are removed after the adhesive is solidified. According to the invention, through mechanical linkage defense, friction type nondestructive connection and micro-channel glue injection technology, the problems of operation safety early warning deficiency, reinforcement of a damaged tower and poor vibration resistance of connection are solved, and uninterrupted operation safety is ensured.

Inventors

• WEI YANGZHI
• LAN JIANKEN
• TAN ZONGHUI
• SHI CAIFA
• LI GUOGEN
• TANG RUIYAN
• YA ZHENGDA
• LI JUSHI
• YU KANGJIAN
• ZENG RENSEN
• LEI MINGZHEN
• LEI BOBO

Assignees

• 中国南方电网有限责任公司超高压输电公司柳州局

Dates

Publication Date

20260512

Application Date

20260316

Claims (10)

1. 1. The uninterrupted main material replacement method suitable for the mountain falling stone damaged transmission tower is characterized by comprising the following steps of: S1, pre-removing a modified static breaker for drilling and pouring rock fracturing of a dangerous rock body on the ascending side of a pole tower, and establishing a rigid protection bent, wherein a mechanical displacement trigger is arranged on the rigid protection bent, and a signal transmission cable is led out to extend to a damaged tower leg, so that an induction linkage defense system is established at the periphery of an operation area; S2, under the protection of the induction linkage defense system constructed in the step S1, installing wedge-shaped hoops with friction-type coatings on the joint points at the upper end and the lower end of the damaged main material section, and installing auxiliary main materials and rigid-flexible coupling prestress joints in parallel between hanging points of the wedge-shaped hoops; s3, adjusting the rigid-flexible coupling prestress nodes, and transferring the load borne by the damaged main material to the auxiliary main material; S4, hoisting a new main material with a micro-channel grid and glue injection holes in the flange surface in the installation vacancy, applying primary twisting torque, injecting special epoxy structural glue into the in-situ curing micro-channel by utilizing the micro-channel, standing until the glue solution is initially set in a pressure-maintaining state, and then finally twisting the bolt to realize gapless connection between the new main material and the original tower body; and S5, curing until the injected epoxy structural adhesive is completely cured and reaches the design strength, performing anti-corrosion treatment on the connection area, and finally completing system disconnection according to the sequence of releasing the auxiliary steel wire rope and the auxiliary main material load, removing the anchor ear and the linkage defense facility.
2. 2. The uninterrupted power main material replacement method suitable for the mountain falling stone damaged transmission tower, which is characterized in that the rock fracturing modified static breaking agent is prepared by mixing a component A, a component B and water, wherein the mass ratio of the water to the total mass of the component A and the component B is 28% -32%; The chemical composition of the component A comprises, by mass, 75.0% -82.0% of calcium oxide, 6.0% -9.0% of silicon dioxide, 2.0% -4.0% of aluminum oxide, 9.0% -11.5% of anhydrous gypsum and 0.5% -1.0% of sodium fluosilicate; The component B comprises a polycarboxylic acid high-efficiency water reducer and an anhydrous citric acid retarder, wherein the mass of the polycarboxylic acid high-efficiency water reducer is 0.8-1.2% of the total mass of the component A, and the mass of the anhydrous citric acid retarder is 0.15-0.25% of the total mass of the component A.
3. 3. The uninterrupted main material replacement method suitable for the mountain falling stone damaged transmission tower is characterized in that the A component preparation method of the modified static breaker for rock fracturing is characterized in that limestone, clay and gypsum are mixed according to stoichiometric ratio, calcined for 2.0-2.5 hours at 1400-1450 ℃ to obtain clinker, cooled and mixed with sodium fluosilicate, and ground to the specific surface area of 350-400m 2 /kg.
4. 4. The uninterrupted main material replacement method suitable for the mountain falling stone damaged transmission tower, which is disclosed by claim 1, is characterized in that the triggering threshold value of the mechanical displacement trigger is set to be 45.0-55.0 mm horizontal displacement of the rigid protection bent frame, and the pretension of the signal transmission cable is set to be 50-80N.
5. 5. The uninterrupted main material replacement method suitable for mountain falling stone damaged transmission towers, which is characterized in that the friction type coating is prepared by adopting an arc spraying process, wherein a Q235 low-carbon steel plate is used as a base material, and pure aluminum wires are used as spraying materials; The parameters of the electric arc spraying process are controlled to be that spraying voltage is 28V-32V, spraying current is 180A-220A, spraying distance is 150mm-200mm, compressed air pressure is 0.5MPa-0.7MPa, the thickness of the prepared coating is 200 mu m-300 mu m, and surface roughness Ra is 12.5 mu m-25.0 mu m.
6. 6. The uninterrupted main material replacement method suitable for the mountain falling stone damaged transmission tower, which is disclosed by claim 1, is characterized in that the rigidity of a disc spring group in the rigid-flexible coupling prestress node is 1.8kN/mm-2.2kN/mm, the axial jacking force of the auxiliary main material is 108.0kN-115.0kN, and the tension of the auxiliary steel wire rope is adjusted to 130.0kN-140.0kN.
7. 7. The uninterrupted main material replacement method suitable for mountain falling stone damaged transmission towers, which is disclosed in claim 1, is characterized in that the in-situ curing type micro-runner injection special epoxy structural adhesive is formed by mixing a component A and a component B according to the mass ratio of 2:1-3:1; the component A is prepared from the following raw materials, by mass, 100.0 parts of bisphenol A epoxy resin, 8.0-12.0 parts of carboxyl-terminated nitrile rubber, 15.0-20.0 parts of reactive diluent C12-C14 alkyl glycidyl ether and 2.0-3.0 parts of fumed silica; The component B is prepared from the following raw materials, by mass, 35.0-45.0 parts of modified alicyclic amine curing agent, 2.0-4.0 parts of 2,4, 6-tris (dimethylaminomethyl) phenol and 1.0-1.5 parts of gamma-glycidyl ether oxypropyl trimethoxy silane.
8. 8. The method for replacing the uninterrupted main material applicable to the mountain falling stone damaged transmission tower according to claim 7, wherein the method for preparing the special epoxy structural adhesive by injecting the in-situ curing micro-runner comprises the following steps: Preparing a component A, namely pre-reacting the bisphenol A epoxy resin and the carboxyl-terminated nitrile rubber for 30-40 minutes under stirring at 60-70 ℃, cooling, adding the reactive diluent and the fumed silica, and dispersing for 20-30 minutes at a rotating speed of 1500-2000 r/min under the condition of vacuum degree of-0.095 MPa to-0.098 MPa; and preparing the component B, namely stirring the modified alicyclic amine curing agent, the 2,4, 6-tri (dimethylaminomethyl) phenol and the gamma-glycidol ether oxypropyl trimethoxy silane at a low speed for 10-15 minutes at normal temperature to form a uniform system.
9. 9. The uninterrupted main material replacement method suitable for the mountain falling stone damaged transmission tower, which is disclosed in claim 1, is characterized in that the depth of the micro-channel grid is 0.3-0.5 mm, the glue injection pressure is controlled to be 2.0-3.0 MPa, and the final twisting torque is 240-260N-m.
10. 10. The uninterrupted main material replacement method suitable for the mountain falling stone damaged transmission towers, which is disclosed by claim 1, is characterized in that in the step S3, the horizontal displacement variation of the tower top is controlled to be not more than 3mm-5mm, and in the step S5, the surface anti-corrosion treatment is to spray an epoxy zinc-rich primer with the dry film thickness of 75.0-85.0 mu m.

Description

Uninterrupted main material replacement method suitable for mountain falling stone damaged transmission tower Technical Field The invention relates to the technical field of operation and maintenance of power transmission lines, in particular to a method for replacing uninterrupted main materials of a damaged power transmission tower in mountain areas. Background The transmission tower is used as a skeleton for electric power energy transmission and is widely distributed in Chongshan mountain. Under the complex geological environment of mountain areas, dangerous rock collapse and falling rock impact are one of main natural disasters causing damage to main materials of towers. In order to ensure the continuity of power supply of a power grid, in-situ replacement of damaged main materials under the condition of not cutting off a power supply is a mainstream maintenance strategy at present. However, existing uninterruptible replacement work technologies have technical drawbacks when faced with mountain environments that have a continuous risk of falling rocks. First, existing safety protection systems lack a physical linkage mechanism between the hazard source and the point of operation. The electronic monitoring equipment is easily interfered or disabled in a strong electromagnetic environment of a mountain area, and the instant mechanical locking response can not be realized when secondary rock fall occurs suddenly, so that operators and towers in a temporary supporting state face extremely high safety risks. Secondly, in the load transfer link, the conventional steel fixture is in hard contact with the tower body, so that the galvanized anti-corrosion layer on the surface of the original tower material is easily damaged. Meanwhile, the existing rigid jacking mode lacks flexible buffering, and local instability of a damaged tower is easily caused by stress mutation generated at the moment of load switching. Finally, due to machining tolerances, there is inevitably an assembly gap at the bolted connection of the new and old components. Under the long-term wind vibration working condition of mountain areas, the point contact connection is easy to generate fretting wear and loosening, an effective gap filling and interface fusion means is lacked, and the integral rigidity and fatigue resistance of the repaired tower are difficult to ensure. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a method for replacing uninterrupted main materials of a power transmission tower which is damaged by falling rocks in a mountain area, which solves the problems that electronic monitoring equipment is easy to be interfered and has lagged response, a tower material anti-corrosion layer is damaged by load transfer of a traditional fixture, local instability is easy to be caused, and the wind vibration resistance performance is insufficient due to the fact that new and old components are connected with each other and an assembly gap exists. In order to solve the problems, the invention provides a method for replacing uninterrupted main materials of a power transmission tower which is damaged by falling rocks in mountain areas, comprising the following steps of: S1, pre-removing a modified static breaker for drilling and pouring rock fracturing of a dangerous rock body on the ascending side of a pole tower, and establishing a rigid protection bent, wherein a mechanical displacement trigger is arranged on the rigid protection bent, and a signal transmission cable is led out to extend to a damaged tower leg, so that an induction linkage defense system is established at the periphery of an operation area; S2, under the protection of the induction linkage defense system constructed in the step S1, installing wedge-shaped hoops with friction-type coatings on the joint points at the upper end and the lower end of the damaged main material section, and installing auxiliary main materials and rigid-flexible coupling prestress joints in parallel between hanging points of the wedge-shaped hoops; s3, adjusting rigid-flexible coupling prestress nodes, and completely transferring the load borne by the damaged main material to the auxiliary main material; S4, hoisting a new main material with a micro-channel grid and glue injection holes in the flange surface in the installation vacancy, applying primary twisting torque, injecting special epoxy structural glue into the in-situ curing micro-channel by utilizing the micro-channel, standing until the glue solution is initially set in a pressure-maintaining state, and then finally twisting the bolt to realize gapless connection between the new main material and the original tower body; and S5, curing until the injected special epoxy structural adhesive is completely cured and reaches the design strength after the in-situ curing micro-channel is filled with the special epoxy structural adhesive, and finally completing system disconnection according to the seque