Novel prestressed anchor cable outer anchor head multiple protection device and fixing method thereof

Abstract

The invention discloses a novel prestressed anchor cable outer anchor head multiple protection device and a fixing method thereof. The multiple protection device is arranged in a cement pier, and comprises a corrugated pipe arranged on the inner side of an anchor hole port; a steel strand is positioned in the corrugated pipe, and a free-section grouting pipe is additionally arranged in the corrugated pipe; a cushion plate is arranged in an outer port of the corrugated pipe; an exhaust pipe is arranged on the inner side of the cushion plate, and an anchor plate is arranged on the outer side; the steel strand penetrates through the anchor plate, and is fixed with the anchor plate; a buffer plate and a corrosion resistant oil storage tank are arranged on the outer side of the anchor plate; and the corrosion resistant oil storage tank is externally connected with an anchor head corrosion resistant oil way and an orifice section corrosion resistant oil way. An inner anchor head of a prestressed anchor cable and a steel strand harness body are put in an anchor hole; the corrugated pipe coats the outer periphery of the steel strand harness body, and is aligned and placed in the anchor hole by 1-2 m; the free-section grouting pipe and the exhaust pipe on the inner side of the outer end of the corrugated pipe are mounted, and a rubber plate is mounted on the interface between the cement pier and a body outer wall; the anchor head corrosion resistant oil way and the orifice section corrosion resistant oil way are mounted; the anchor plate is mounted on the outer side of the cushion plate; and the buffer plate and the corrosion resistant oil storage tank are mounted on the outer side of the anchor plate.

Description

technical field [0001] The invention relates to geotechnical engineering equipment, in particular to a novel multi-protection device for the outer anchor head of a prestressed anchor cable and a fixing method thereof. Background technique [0002] The prestressed anchorage technology was first used in Algeria’s Sherfa Dam in 1934. The prestressed anchorage technology in my country was first applied in the dam foundation on the right bank of Meishan Reservoir in 1964. Since then, the anchor cable technology has been used in many projects. promoted the application. At present, prestressed anchorage technology has become one of the most widely used reinforcement measures in geotechnical engineering. my country's water conservancy, hydropower, transportation, mining and other basic construction projects are experiencing an unprecedented stage of development. In order to ensure the stability of ground and underground projects, a large number of prestressed anchor cables have been...

AI Technical Summary

Problems solved by technology

[0006] According to the investigation and research on the protective measures of prestressed anchor cables in typical domestic projects, the corrosion of the outer anchor head of the anchor cable is mainly caused by the cracking of the concrete protective pier, the emergence of new cracks in the local surrounding rock mass, the dislocation of the concrete pier and surrounding rock mass, and the backfilling of the anchor cable hole with cement. Influenced by the lack of density of the mortar, the use of concrete wrapping protection did not effectively prevent the corrosion of the outer anchor head

The analysis of anchor cable failure cases at home and abroad also shows that simple concrete pouring protection does not prevent the occurrence of corrosion at the outer anchor head, or cannot achieve an ideal anti-rust effect

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