Pressure-dispersive large-deformation self-adaptive anchor bolt

Abstract

The invention discloses a pressure-dispersive large-deformation self-adaptive anchor bolt. The pressure-dispersive large-deformation self-adaptive anchor bolt comprises a long anchor bolt spring component and short anchor bolt spring components, the long anchor bolt spring component is arranged in the middle of a steel tray, and the short anchor bolt spring components are distributed around the long anchor bolt spring component. Tail rods of the short anchor bolt components penetrate the steel tray, anchor bolts penetrate anchor bolt reserve holes of a rear bearing steel plate, and two ends of the anchor bolts are sleeved with nuts so as to press the steel tray and the rear bearing steel plate respectively. The tail rods of the long anchor bolt spring component penetrate the steel tray, the middle of the anchor bolts penetrate grouting reserve holes of the rear bearing steel plate, the front end of one of the anchor bolts penetrate a center hole of a front bearing steel plate, and two ends of the anchor bolts are sleeved with the nuts so as to press the steel tray and the front bearing steel plate. The pressure-dispersive large-deformation self-adaptive anchor bolt has the advantages that large deformation of surrounding rocks can be adapted, sudden-onset disasters such as tunnel rockburst and coal mine impact ground pressure can be effectively buffered and controlled, and the pressure-dispersive large-deformation self-adaptive anchor bolt is reasonable in stress distribution.

Description

technical field [0001] The invention belongs to roadway and tunnel disaster protection facilities, in particular to a large-deformation self-adaptive bolt. Background technique [0002] The mining of mineral resources in our country requires a large number of tunnels to be excavated underground. The total length of newly excavated roadways in large and medium-sized coal mines is as high as 8000km each year, and more than 80% of the mining is concentrated in coal mine roadways. Keeping coal mine roadways smooth and surrounding rock stable is of great significance to coal mine construction and safe production. The mining depth of coal resources is increasing year by year. For example, the mining depth of Zhangxiaolou Mine in Xuzhou has reached 1,300 meters. In the process of engineering construction, more and more safety support problems of deep roadways will be encountered. [0003] With the continuous deepening of mining depth, the surrounding rock of the cavern often exhi...

AI Technical Summary

Problems solved by technology

However, in the case of large deformation of the surrounding rock, there is also the danger of bolt failure.

[0005] Bolts currently used in roadway and tunnel engineering cannot work properly in the presence of large deformations in the surrounding rock

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