Coordinated deformation anchoring device for full-length anchoring support

Abstract

The invention discloses a full-length anchoring-supported compatible-deformation anchoring device, which comprises an anchoring rod, a backing plate and a nut, wherein the anchoring rod comprises an external-thread end part, a rod-body part and a threaded-steel end part, the external-thread end part and the threaded-steel end part are respectively positioned at the rear end and the front end of the rod-body part, a spring or a coil which is made of a steel stranded wire is sleeved onto the rod-body part, both ends of the spring or the coil which is made of the steel stranded wire are welded onto the rod-body part, the backing plate is sleeved onto the external-thread end part, and the nut is used for fixing the backing plate by being connected with the external-thread end part through external threads. The compatible deformation of full-length anchored anchoring rods and surrounding rocks can be realized through the full-length anchoring-supported compatible-deformation anchoring device, so that the defect of small deformation of the full-length anchored anchoring rods and the defect of stress concentration of end-anchored anchoring-rod anchoring segments are avoided, and the controlling action of the full-length anchored anchoring rods on the large-deformation surrounding rocks is improved.

Description

technical field [0001] The invention relates to a coordinated deformation bolt device used for full-length anchor support of engineering rock mass support. Background technique [0002] With the continuous development of underground engineering such as mining, an efficient, safe and stable support method is urgently needed to control the stability of deep engineering rock mass. As an active support type, the full-length anchor bolt is widely used because it can provide high support force continuously and stably, and has good reliability. But it is not as good as the end anchor bolt in controlling the high stress weak surrounding rock with large deformation. The full-length anchor bolt has no free section, so the amount of deformation is limited. In places where the deformation of the surrounding rock is large, the stress increases sharply. In places where the deformation of the surrounding rock is small, the stress on the bolt is small. Uniformity leads to uneven stress di...

AI Technical Summary

Problems solved by technology

However, it is not as effective in controlling the high-stress weak surrounding rock with large deformation as the end bolt

The full-length anchor bolt has no free section, so the amount of deformation is limited. In places where the deformation of the surrounding rock is large, the stress increases sharply. In places where the deformation of the surrounding rock is small, the stress on the bolt is small. Uniformity leads to uneven stress distribution, which leads to instability phenomena such as fracture and slippage of the anchor rod.

For the end anchor bolt, there is a free section between the anchor section and the anchor backing plate, which can produce a certain deformation and transfer part of the deformation of the shallow surrounding rock to the deep rock mass, but the stress on the anchor bolt is in the anchor section. Centralized, prone to fracture and other instability

The reason is that the uneven deformation of the surrounding rock leads to uneven stress on the bolt, and the coordinated deformation ability of the existing full-length anchor bolt and end anchor bolt is poor.

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