Lead screw constant resisting anchor stock

Abstract

The invention relates to a lead screw constant resisting anchor stock. The lead screw constant resisting anchor stock is composed of an anchor head, a lead screw anchor end, a silo pallet and an internal screw lock, wherein, the anchor head is fixedly anchored to a roadway (tunnel) surrounding rock, the lead screw anchor end is connected with the anchor head and composes a rod body. The silo pallet is sleeved on the lead screw anchor end, and the internal screw lock is fixedly tightened to the lead screw anchor end. A ball bearing is arranged between the silo pallet and the internal screw lock. Supporting forces are stressed on the roadway (tunnel) surrounding rock by the silo pallet through the self locking feature and the tightening effort of the internal screw lock, when the surrounding rock deforms, the pressure on the silo pallet is stronger than the self locking force formed by the lead screw anchor end and the internal screw lock, and accordingly the internal screw lock gyrates and shrinks consistently with the deformation of the surrounding rock; by providing a constant resistance in the gyrating and shrinking process of the internal screw lock, constant supporting force of the anchor stock can be achieved. The anchor stock device has the characteristics of being constant in supporting force, reliable in working state and adaptive to large deformation of the roadway (tunnel) surrounding rock, and is a great innovation of novel anchor stocks with large deformation.

Description

technical field [0001] The invention belongs to the technical field of large-deformation roadway (tunnel) support, and in particular relates to a screw-type constant-resistance bolt with constant support force, reliable working condition, and adaptable to large deformation of roadway (tunnel) surrounding rock. Background technique [0002] The proportion of large-deformation roadways in my country is huge, and high-strength supports are increasing continuously. However, due to the poor ability of conventional high-strength supports to adapt to the deformation of surrounding rocks, there are still phenomena such as bolt breakage, anchor failure, and frequent roof falls in roadways under such conditions. Aiming at the support problem of this large deformation roadway, many new types of large deformation anchors have been developed, such as impact-resistant anchor cables, constant resistance anchors, flexible anchors, etc., and have achieved good results in engineering practice....

AI Technical Summary

Problems solved by technology

[0003] In view of the above situation, in order to solve the defects of the existing devices, the purpose of the present invention is to provide a bolt with constant supporting force, reliable working condition, and adaptable to the large deformation of the roadway (tunnel) surrounding rock, so as to solve the problem of large deformation, The support problem of roadway with high risk of roof fall

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