Yielding hollow steel tube concrete support and construction method

Abstract

The invention discloses a yielding hollow steel tube concrete support and a construction method. The support comprises an upper arc-shaped pipe component and a lower arc-shaped pipe component, wherein the outer layer of the upper arc-shaped pipe component and the outer layer of the lower arc-shaped pipe component are outer steel pipes, inner steel pipes are arranged in the outer steel pipes, positioning rods are spirally arranged between the inner walls of the outer steel pipes and the outer surfaces of the inner steel pipes at intervals in the axial direction, concrete is further injected between the outer surfaces of the inner steel pipes and the inner surfaces of the outer steel pipes, and a shaft pipe is further arranged in the center in each inner steel pipe; a support plate is arranged between the surface of the shaft pipe and the inner surface of the inner steel tube; grouting holes are formed in the outer steel pipe wall of the lower arc-shaped pipe component, and exhaust holes are formed in the outer steel pipe wall of the upper arc-shaped pipe component. The method comprises the following steps: sequentially connecting the plurality of outer steel pipes and inner steel pipes in an underground roadway chamber to form an integral support; supporting a roadway section; and filling concrete. The support has certain flexibility, the yielding capacity of the support is improved, and meanwhile the self weight of the support is reduced.

Description

technical field [0001] The invention belongs to the technical field of mine roadway support equipment, and in particular relates to a pressure-relieving hollow steel tube concrete support and a construction method. Background technique [0002] With the depletion of shallow resources, mines gradually develop into deep mining, but deep mining is accompanied by harsh geological conditions, which further increases the difficulty of roadway support. Traditional support methods such as anchor shotcrete and U-shaped steel brackets are difficult to maintain the stability of the roadway, and large deformation often occurs and difficult to support. Concrete-filled steel tube support is a very potential new type of high-strength roadway support structure, which has the characteristics of simple manufacture, high bearing capacity, good stability, and low support cost. However, after the existing concrete-filled steel tube support members are filled with concrete, there are many proble...

AI Technical Summary

Problems solved by technology

However, after the existing concrete-filled steel tube support members are filled with concrete, there are many problems in the support, such as the stiffness of the members is too large, the yield capacity is poor, and the combination of yield and resistance cannot be realized.

The existing concrete materials and pouring methods are difficult to ensure that the concrete is densely poured, which in turn affects the strength of the support, and the concrete-filled steel tube support consumes more concrete and has a larger dead weight, which is not conducive to reducing costs

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