Retractable joint of steel pipe concrete arch bracket and arch bracket

Abstract

The invention discloses a retractable joint of a steel pipe concrete arch bracket and the arch bracket. The problem that a rigid connection joint in the arch bracket is prone to causing damage to thearch bracket is solved. The bearing capacity of an initial support of the steel pipe concrete arch bracket is ensured, and a support body has the retractable performance. When the load of surroundingrocks is enlarged, the arch brackets can be retracted to achieve the yield moderately and reduce the load acting on the support body, and the long-term stability of the support body is achieved. According to the technical scheme, the retractable joint of the steel pipe concrete arch bracket comprises an internally-inserted steel pipe, wherein the two ends of the internally-inserted steel pipe areinserted into a joint of the arch bracket. The outer portion of the internally-inserted steel pipe is sleeved with a joint sleeve. A compression limiting part is arranged on the outer side of the pipein the middle of the internally-inserted steel pipe in a sleeving mode. The compression limiting part is arranged between the arch bracket on the two ends of the internally-inserted steel pipe. Whenthe force of the arch brackets exceeds the voltage endurance capability of the compression limiting part, the compression limiting part displaces, then the joint of the arch brackets displaces, and the overall size of the arch brackets is reduced to achieve the yield.

Description

technical field [0001] The invention relates to the technical field of underground engineering support, in particular to a shrinkable joint of a steel pipe concrete arch frame and an arch frame. Background technique [0002] With the development of my country's underground engineering towards high buried depth and large cross-section, the stability of surrounding rock in underground space is getting worse, and the difficulty of engineering support is becoming more and more prominent, which has become an important factor affecting the safe construction of underground engineering and the safe and efficient production of coal question. The concrete-filled steel tube arch frame has high bearing capacity and simple construction, and has become a support measure widely used in deep soft rock chambers and other large deformation underground spaces. [0003] However, joint casings are commonly used in engineering to assemble concrete-filled steel tube arches. The segments of the arc...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art above, the present invention provides a shrinkable joint for concrete-filled steel tube arches to solve the problem that the arches in underground engineering cannot be retracted. The shrinkable joint proposed by the present invention can be Guarantee the initial bearing capacity of the concrete-filled steel tube arch frame, and make the arch frame shrinkable. When the surrounding rock load increases to a certain extent, the arch frame can be contracted and moderately yielded to reduce the surrounding rock acting on the arch frame. load, which is beneficial to protect the long-term stability of the support structure

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