Anchor cable outer anchor head steel strand protective device and installation method thereof

Abstract

The invention discloses an anchor cable outer anchor head steel strand protective device. The anchor cable outer anchor head steel strand protective device comprises steel strands, a steel base plate and an anchor. The steel strands include the inner steel strand located in a rock body and the outer anchor head steel strand extending out of the outer side of the anchor. The periphery of the outer anchor head steel strand is sleeved with a cylindrical protective cover, and a flange is arranged at the end of the cylindrical protective cover and connected to the steel base plate through bolts. The top wall of the protective cover is provided with a first exhaust pipe and a first oil inlet. The upper portion of the protective cover is provided with an oil supply tank, an oil outlet is formed in the bottom wall of the oil supply tank, the oil supply tank is fixed to the steel base plate through an oil supply oil tank supporting frame, and the top wall of the oil supply tank is provided with a second exhaust pipe and a second oil inlet. The first oil inlet and the oil outlet are connected through an indicator pipe. The invention further discloses an installation method of the anchor cable outer anchor head steel strand protective device. The anchor cable outer anchor head steel strand protective device is simple, practical, efficient, economical and capable of guaranteeing that the outer anchor head steel strand is immersed in an oil body all the time, and an inspector can visually judge the oil level in the protective cover.

Description

technical field [0001] The present invention relates to the fields of water conservancy and hydropower, roads, bridges, and geotechnical engineering reinforcement treatment, and specifically refers to a steel strand protection device for the outer anchor head of the anchor cable, and the invention also relates to the steel strand protection device for the outer anchor head of the anchor cable installation method. Background technique [0002] Since the anchor cable technology was introduced into our country in the 1960s, it has been widely used in many engineering fields, especially in water conservancy and hydropower. At present, anchor cables have become an important technology for the support and reinforcement of dam foundations, slopes, and underground caverns in water conservancy and hydropower projects. The anchor cable is generally made of high-strength steel strands braided side by side. It is manually pushed into the pre-finished geotechnical drilling pipe, and the...

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Problems solved by technology

This also shows from another perspective that in actual engineering, the protective cover is completely filled with oil only within a short period of time after the installation of the protective cover is completed, which is far from the waterproof of the external anchor head steel strands in engineering. Corrosion Protection Requirements

[0006] 2. The inspectors cannot intuitively judge the oil level in the protective cover

Since the current end protection cover is an opaque steel pipe, the inspectors cannot visually judge the current oil level in the protection cover with the naked eye, let alone judge whether the steel strand of the outer anchor head is completely intruded into the oil body

Therefore, the use of the current end protection device is very likely to cause the long-term failure of the waterproof and anti-corrosion device of the outer anchor head steel strand, but it has not been discovered in time

[0008] 3. The steel strand of the outer anchor head is not fully protected against water and corrosion, and corrosion occurs frequently, making it impossible to compensate for tension and relaxation, reducing the service life of the anchor cable

The occurrence of corrosion phenomenon will also cause the effective length of the outer anchor head steel strand to be reduced, which will eventually make it impossible to perform later compensation tension and relaxation

If the corrosion phenomenon is not found for a long time, it may cause the failure of the entire steel strand, which will lead to the failure of the anchor cable and affect the safety of the reinforced object

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