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Reinforcement method for broken damage of power transmission and transformation reinforced concrete pole

A reinforced concrete, power transmission and transformation technology, which is applied in building maintenance, construction, building construction, etc., can solve the problems of transmission line safety hazards, large indirect losses, and long-term power outages in the power grid, and achieve the reinforcement of axial bearing capacity and High bending resistance, high transverse crack resistance, and high rigidity

Inactive Publication Date: 2018-05-04
SHANDONG ELECTRIC POWER IND BOILER & PRESSURE VESSEL INSPECTION CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the effect of replacing the structure is better, the cost is high and the power grid needs to be shut down for a long time. Especially for the substation structure, the indirect loss is huge. In addition, it will cause the problem of uneven quality of the old and new structures in the power grid
Only using cement grouting or bonding glue to repair cracks cannot greatly improve the axial bearing capacity and bending resistance of the cement rod, and it can only treat the symptoms but not the root cause. It cannot make up for the decrease in bearing capacity caused by corrosion of steel bars, especially the increase in the corrosion rate of the steel ring due to the residual stress of the welded structure. Once the anti-corrosion layer is damaged and the bearing capacity of the welded joint decreases due to corrosion, it is easy to break at this place
Temporary reinforcement using hoops or arc-shaped hoops cannot meet the repair of large-area damaged cement rods, and the bolts used are easy to loosen (suitable for temporary reinforcement) and cannot be used for long-term repair applications
At present, there are a large number of cracks and breakages in the old reinforced concrete poles for transmission, which pose a threat to the environmental safety of transmission lines and passages. However, due to various factors, it is difficult to replace them all, which has become a safety hazard for transmission lines.

Method used

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  • Reinforcement method for broken damage of power transmission and transformation reinforced concrete pole
  • Reinforcement method for broken damage of power transmission and transformation reinforced concrete pole
  • Reinforcement method for broken damage of power transmission and transformation reinforced concrete pole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Remove the loose concrete on the cement poles where the cracked and exposed bars and the broken and loose concrete are exposed to expose the steel bars. Grind the four sides of the concrete where the exposed ribs are damaged into beveled edges with an angle of 30°-40°; clean up the dust or loose stones and other sundries at the bottom of the exposed ribs, such as figure 1 shown.

[0038] Mix the concrete according to the proportion of C50 strength grade, add 5% expansion agent into the concrete, fill the concrete to the damaged and exposed ribs, and its surface is basically the same as the original cement rod shape, such as figure 2 shown.

[0039] Install the prestressed steel pipe after the cement solidifies and hardens, make the prestressed steel pipe and install it to the damaged place such as image 3 As shown, the specific process is:

[0040] Consult or measure the outer diameter of the reinforced concrete pole for power transmission and transformation, selec...

Embodiment 2

[0046] On the basis of completing the operation of embodiment 1, in order to prevent the crack from continuing to expand, make such as Figure 8 The prestressed steel hoop shown, the material, thickness and assembly of the steel hoop are the same as the prestressed steel pipe, and the schematic diagram of the groove of the steel pipe fastened by the bolt fastening block is as follows Figure 9 shown.

[0047] The installation principle of the steel hoop is: install one at a distance of 500mm for parts with cracks or cracks, and install one at a distance of 1000mm for parts without cracks. Steel hoops must be installed at the ends of cracks when arranging.

[0048] The butt welds on each side of the prestressed steel hoop are spot welded at two points, and the length is not less than 15mm. The welding process of the butt weld is the same as that of the prestressed steel pipe, and the steel hoop is painted with paint as a whole after welding.

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Abstract

The invention discloses a reinforcement method for broken damage of a power transmission and transformation reinforced concrete pole. After clearing away loose concrete at a broken place of the concrete pole, the broken power transmission and transformation reinforced concrete pole can be reinforced by electrification through the application of forming of a repairing concrete layer, installation of a pre-stressed steel pipe on the outer layer, crack sealing of the concrete pole, overall appearance corrosion protection, and the installation of a pre-stressed steel hoop; and the axial bearing capacity and the bending resistance of the concrete pole can be effectively reinforced, the repair of the large-area damaged cement pole can be fulfilled, and the tensile strain in the circumferential direction of a pre-stressed electric pole after bearing the axial load can be effectively limited, thereby limiting the expansion and formation of longitudinal cracks.

Description

technical field [0001] The invention belongs to the field of repairing damaged cement poles for power transmission and transformation, and in particular relates to a damaged and damaged reinforcement method for reinforced cement poles for power transmission and transformation. Background technique [0002] At present, there are still few studies on the damage of reinforced concrete structures in power transmission and transformation grids. Reinforced concrete structures are widely used in power transmission and transformation facilities in my country. Compared with steel structure pole tower structures, this structure has the advantages of less investment and corrosion resistance. With the increase of operation and service time, reinforced concrete structures are prone to carbonization, aging, cracking, concrete peeling, steel corrosion and other damages, which threaten and affect the safe operation of the power grid. [0003] At present, reinforced concrete poles for power t...

Claims

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Application Information

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IPC IPC(8): E04G23/02
CPCE04G23/0203
Inventor 张忠文杜宝帅邓化凌李新梅李志明杨波孙晓斌高翔严黔李文刘洋李珊季善浩王长勇彭宪友
Owner SHANDONG ELECTRIC POWER IND BOILER & PRESSURE VESSEL INSPECTION CENT CO LTD