CN202100021U - Transverse crack reinforcing device for reinforced concrete electric pole with circular section - Google Patents

Abstract

The utility model discloses a transverse crack reinforcement device for reinforced concrete electric poles with annular sections, which comprises two pair of rod clamps connected by bolts; each pair of rod clamps is composed of two mutually matched arc-shaped The two arc-shaped clamps are connected by bolts, and a cylindrical cavity is formed between the two arc-shaped clamps. Use: When there are transverse cracks, install a copy of the utility model rod clamps at the upper and lower positions of the cracks in the tower body, first tighten the bolts connecting the arc-shaped clamps, and apply radial stress to the cracks in the shaft to fix the arc-shaped clamps , and then adjust the bolt distance between the upper and lower pair of rod clamps, tighten them, and apply axial force to the crack of the shaft to prevent the crack from expanding, and at the same time increase the structural rigidity and strength of the shaft. Compared with the prior art, the beneficial effect of the utility model is: after the reinforcement work is completed, the maximum stress value is reduced, and at the same time, the crack does not expand, and the operation is simple and convenient, no power failure is required, and the cost is low.

Description

A reinforcement device for transverse cracks in reinforced concrete poles with circular sections

technical field

The utility model relates to a reinforcement device for transverse cracks of a reinforced concrete electric pole with a circular section.

Background technique

At present, in most areas of our country, most of the 110kv (and below) high-voltage transmission lines use reinforced concrete poles except for some tension towers in special areas and special crossings. The reinforced concrete poles of high-voltage transmission lines are mainly composed of reinforced concrete main poles, reinforced concrete fork beams or steel fork beams, pull wires and cross-arms, etc. The reinforced concrete main poles have two types: equal diameter and tapered (dial tip), generally composed of 6m or 9m pole sections are welded.

my country's transmission lines use reinforced concrete poles, which have a history of 50 to 60 years, and have accumulated rich experience in design, manufacture, installation, operation and maintenance. However, with the increase of the operating time of the tower and the commissioning and operation of new poles, practice also reflects that the structural form of reinforced concrete poles does have some problems that need to be studied and further resolved.

Under the same conditions, reinforced concrete poles are damaged, aged faster and have a shorter service life than other reinforced concrete buildings. The upper part of the pole is generally slightly damaged. However, the part of the pole close to the ground and above the ground is generally damaged the most. Cracks and cracks of concrete poles generally occur in the lower and middle sections, the crack width is 0.1-10mm, and the length varies from 0.3m to the entire length of the pole section; or: the pole section produces partial circumferential cracks or along the surrounding circumferential cracks, these phenomena generally also occur In the lower and middle section; or: general aging, carbonization, corrosion, loose and discolored material, and reduced strength in the pole section, often close to the ground, corrosion and damage are more serious, and the lower part of the pole has different large and small lumps. Steel bars and stirrups are severely corroded. Among the above-mentioned damage forms, longitudinal cracks and longitudinal cracks in pole sections are more common and prominent, and some even new lines have cracks and cracks, which accelerates the aging of towers and significantly shortens their operating life.

The main factors for the development of cracks in reinforced concrete towers are: wind vibration, wind swing, frost heave, temperature alternation and steel corrosion. Under the influence of these factors time after time, year after year, it has continuously developed into long and wide cracks. The aging, carbonization, and corrosion damage of reinforced concrete towers are faster than other reinforced concrete under the same conditions. Often near the outer surface. Coupled with carbonization, steel corrosion, and cracking, the three types of damage interact with each other to form a vicious circle, resulting in faster damage and shorter service life of towers than other reinforced concrete. The damage reasons and damage patterns of reinforced concrete towers are very complicated. Carbonization, aging, frost heaving cycle, corrosion of steel bars and derivative cracking are all normal and inevitable, and they will only happen after a certain number of years. However, the structural damage cracks of the towers are produced after the height of the rods increases, the slenderness ratio increases, and the "bamboo crack effect" gradually appears. This kind of damage generally occurs in newly-built or short-running lines, which accelerates and arrives in advance of other damage forms, which will greatly shorten the service life of the tower. Therefore, the prevention and treatment of longitudinal cracks in reinforced concrete towers of high-voltage transmission lines are crucial to the long-term safe and economical operation of the lines.

Reinforcement measures for cracks in reinforced concrete towers generally use high-strength cement and high-osmosis waterproofing agents to infiltrate cracks, so as to eliminate the cutting damage of cracks as much as possible. This method has a large amount of work and takes a long time. At the same time, due to the uneven cement structure after infiltration, stress concentration is caused, which is not effective in preventing crack propagation, and it is difficult to guarantee the structural strength of the tower.

Contents of the invention

Aiming at the above-mentioned prior art, the utility model provides a transverse crack reinforcement device for a reinforced concrete electric pole with a circular section.

The utility model is achieved through the following technical solutions:

A transverse crack reinforcement device for reinforced concrete electric poles with circular cross-sections, including two pair of rod clamps connected by bolts; each pair of rod clamps is composed of two arc-shaped clamps that cooperate with each other. The two arc clamps are connected by bolts, and a cylindrical cavity is formed between the two arc clamps.

Preferably, the two secondary rod clamps are connected by four bolts, and the four bolts are divided into two groups and distributed on both sides of the arc clamp.

Preferably, the two arc-shaped clamps are connected by four bolts, and the four bolts are divided into two groups and distributed on both sides of the arc-shaped clamps.

Use: When there are transverse cracks in the reinforced concrete pole with circular section, install a copy of the utility model pole clamp at the upper and lower positions of the crack in the tower body, first tighten the bolts connecting the arc clamp, and apply radial stress to the crack in the pole body Fix the arc-shaped clamp, then adjust the bolt distance between the upper and lower rod clamps, tighten it, and apply axial force to the crack of the shaft to prevent the crack from expanding, and at the same time increase the structural rigidity and strength of the shaft.

In practical application, through the multi-point vibration measurement of the pole body and the vibration and mechanical strain measurement of the foundation part, the operation status of the reinforced pole is fully tested. The test results show that the reinforcement scheme has achieved very good results.

Compared with the prior art, the beneficial effect of the utility model is: after the reinforcement work is completed, the maximum stress value is reduced, and at the same time, the crack does not expand, and the operation is simple and convenient, no power failure is required, and the cost is low.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a reference diagram of the use state of the utility model.

Among them, 1. Rod clamp; 2. Bolt; 3. Arc clamp; 4. Transverse crack.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

A device for strengthening the transverse cracks of reinforced concrete poles with circular cross-sections, including two pole clamps 1 connected by bolts 2; each pole clamp 1 is composed of two arc-shaped clamps that cooperate with each other 3, the two arc-shaped clamps 3 are connected by bolts 2, and a cylindrical cavity is formed between the two arc-shaped clamps 3.

The two secondary rod clamps 1 are connected by four bolts 2 , and the four bolts 2 are divided into two groups and distributed on both sides of the arc-shaped clamp 3 .

The two arc-shaped clamps 3 are connected by four bolts 2 , and the four bolts 2 are divided into two groups and distributed on both sides of the arc-shaped clamp 3 .

Use: When there is a transverse crack 4 in the reinforced concrete pole with a circular section, install a copy of the pole clamp 1 of the utility model at the upper and lower positions of the crack in the tower body, first tighten the bolt 2 connecting the arc-shaped clamp 3, Apply radial stress to fix the arc-shaped clamp 3, then adjust the distance between the bolts 2 between the upper and lower rod clamps 1, tighten them, and apply axial force to the crack of the shaft to prevent the crack from expanding, and at the same time increase the structural rigidity and strength of the shaft .

In practical application, through the multi-point vibration measurement of the pole body and the vibration and mechanical strain measurement of the foundation part, the operation status of the reinforced pole is fully tested. The test results show that the reinforcement scheme has achieved very good results.

Claims (3)

1. one kind is used for ring section reinforced concrete pole transverse cracks bracing means, it is characterized in that: comprise the binary link folder, connect through bolt between the binary link folder; Every secondary bar cramp is to be made up of two arc clips that cooperatively interact, and connects through bolt between two arc clips, forms a cylindrical cavity between two arc clips.

2. a kind of ring section reinforced concrete pole transverse cracks bracing means that is used for according to claim 1 is characterized in that: connect through four bolts between the said binary link folder, one group in twos on four bolts are divided into two groups, are distributed in arc clip both sides.

3. a kind of ring section reinforced concrete pole transverse cracks bracing means that is used for according to claim 1; It is characterized in that: connect through four bolts between said two arc clips; One group in twos on four bolts are divided into two groups, are distributed in arc clip both sides.

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