High-pretightening anchor rod tensioning device

• Main Authors: LIU HONGQI, LI FUPING, LIU JIANZHUANG, ZHANG JIAYONG, GAN DEQING, ZHU LINGQI, LI YUELONG, GUO LIWEN
• Format: Patent
• Language: English
• Published: 29.10.2014
• Subjects: EARTH DRILLING; EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; GALLERIES; HYDRAULIC ENGINEERING; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; SOIL SHIFTING; TUNNELS; UNDERGROUND OR UNDERWATER STRUCTURES

The utility model relates to a high-pretightening anchor rod tensioning device which comprises an anchor rod, wherein the anchor rod is sleeved with a connecting sleeve, and a rectangular twisting and locking window is arranged at one end, close to the rock mass, of the connecting sleeve; a hollow hydraulic oil cylinder is arranged at the lower end of the connecting sleeve, the end part of the anchor rod is connected with one end of a thickened nut, the other end of the thickened nut is connected with one end of a screw, and a check nut is connected with end part, extending out of the hollow hydraulic oil cylinder, of the screw; a ratchet wrench is arranged in the rectangular twisting and locking window; and the hollow hydraulic oil cylinder is connected with a high-pressure oil pipe through a hydraulic quick connector. The high-pretightening anchor rod tensioning device is simple in structure, low in manufacturing cost, and convenient to mount and dismount during working; a twisting type mounting pretightening mode of the anchor rod is changed into a tensioning type mounting pretightening mode, the pretightening force is increased to the upper limit 100 kN from 20-30 kN, and the technical problem that the higher pretightening mounting cannot be realized by a resin anchor rod is solved; and besides, the operation is convenient, safety and reliability are achieved, the labor intensity of a worker is reduced, and the work efficiency is improved.