Active self-adaptative constant-resistance lengthener for prestress anchor cable

Abstract

The invention discloses an active self-adaptative constant-resistance lengthener for a prestress anchor cable. The inner diameter of a thick-wall outer steel jacket is smaller than the outer diameter of a contact section of a thin-wall inner steel jacket, the outer diameter of a non-contact section of the thin-wall inner steel jacket is smaller than the inner diameter of the thick-wall outer steel jacket, the front end of the thick-wall outer steel jacket is provided with an inward convex lock block, the rear end of the thick-wall outer steel jacket is connected with a rear-end clamping handle through screw threads, a front-end chuck is connected with the thin-wall inner steel jacket through nuts and is provided with a front-end lock hole of a locking steel strand, and the rear-end clamping handle is provided with a rear-end lock hole of the locking steel strand. A disk of the rear-end clamping handle is provided with eight lock holes, and a steel strand of the anchor cable is connected with one end of the lengthener for the prestress anchor cable through the rear-end lock hole. The front-end chuck is connected with the thin-wall inner steel jacket through the nuts and is providedwith eight front-end lock holes, and the steel strand of the anchor cable is connected with the other end of the lengthener for the prestress anchor cable through the front-end lock hole. The active self-adaptative constant-resistance lengthener disclosed by the invention has the advantages of simple structure, convenience for use, increased load for actively regulating the prestress anchor cableunder constant resistance, stable constant-resistance effect under high load and safety in control over lengthening limit.

Description

technical field [0001] The invention relates to the field of rock mass safety support in geotechnical engineering, and more specifically relates to an active self-adaptive constant resistance extender for prestressed anchor cables, which is suitable for using prestressed anchor cables to reinforce rock in slope engineering or underground engineering. body. Background technique [0002] Restricted by my country's complex engineering geological conditions, hydropower, transportation, resources, energy, national defense and other large-scale geotechnical engineering constructions, such as hydropower development in the west, south-to-north water diversion, deep mining, oil / gas extraction, strategic energy storage, hydropower slopes, underground Military bunker projects, etc., all involve the support technology of using prestressed anchor cables to reinforce engineering rock mass. However, engineering rock mass usually undergoes increasing deformation release over time due to the...

AI Technical Summary

Problems solved by technology

[0010] In view of the above existing problems, the purpose of the present invention is to provide an active self-adaptive constant resistance extender for prestressed anchor cables, which can actively regulate the load growth of prestressed anchor cables under high load and constant resistance conditions, and realize rock and soil Anchor cables safely deal with large deformation of rock mass in engineering

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