A roadway support device and construction method in coal mine goaf

Abstract

The invention discloses a tunnel support device of a coal mine goaf. The tunnel support device comprises more than two steel pipes, wherein the steel pipes are arranged along the surrounding contour of a tunnel and are vertical to the plane of the surrounding contour of the tunnel; more than two steel brackets are arranged in an area defined by the steel pipes in a surrounding manner and are vertical to the steel pipes; more than two anchor bolt holes are formed in each steel bracket, an anchor bolt is arranged in each anchor bolt hole, a flexible formwork and a reinforcement net are sequentially arranged on each anchor bolt in a penetrating manner, concrete is arranged in each flexible formwork, and the two adjacent flexible formworks on the same steel bracket are mutually connected. The tunnel support device has the advantages that the strength of the support structure is high, and the stability and reliability are realized. A construction method of the tunnel support device of the mine coal goaf has the advantages that the difficulty in support operation is low, the support effect is good, the construction speed is high, the removal of the formworks is not needed, and the suitability is high.

Description

technical field [0001] The invention belongs to the technical field of coal mine support, and relates to a coal mine goaf roadway support device and a construction method thereof. Background technique [0002] In the past, due to reasons such as mining conditions or production technology, coal mines in China left a large amount of residual coal in the process of coal mining, and some coal mines left a large number of goafs due to disorderly mining. With the increase of coal mining intensity, mine mergers and reorganizations, etc. need to re-plan mining, or due to the need for re-mining, roadways have to be excavated in goafs for coal mining. These goafs have generally been formed for a long time. Although most of the goafs are basically filled, there are still a large number of fissures or even sections that have not been completely filled. The surrounding rock in the goaf is mostly loose and broken, and the self-stabilization ability is poor. At the same time, the detectio...

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Problems solved by technology

The surrounding rock in the goaf is mostly loose and broken, and the self-stabilization ability is poor. At the same time, the detection of the goaf is also very difficult. These all bring great difficulties to the tunneling and support of the mine. An important conundrum facing these mines

[0003] The existing goaf roadway support methods mainly include shed support, material stone masonry, anchor net spray support, grouting closure and reinforcement, etc. When encountering a large-scale goaf, or the geological conditions of the goaf The situation is complex, when the deformation of the surrounding rock and the pressure of the mine are high, the anchor net cable support operation is difficult, the goaf collapses and the surrounding rock is unstable, and the support effect is not good. The above support methods often cannot meet the needs of the goaf. roadway support requirements

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