Retractable concrete arch and anchor rod combined support system and construction method

Abstract

The invention discloses a retractable concrete arch and anchor rod combined support system and a construction method. A retractable concrete arch is compounded by a double-layer material, one layer is a concrete layer, and the other layer is a high-pressure retractable material layer; an anchor rod passes through the concrete layer and the high-pressure retractable material layer and is connectedwith surrounding rock to form the retractable concrete arch and anchor rod combined support system. The method comprises the following steps of: pumping normal concrete or fast hardening concrete into an inter-layer space of a double-layer fiber flexible template through a delivery pipe and an inner-layer perfusion opening by a concrete pump; and after the concrete is solidified, pumping foam concrete or yellow mud into an outer-layer space of the double-layer fiber flexible template. The retractable concrete arch and anchor rod combined support system has a simple and reliable support structure, is convenient to construct, has high mechanization degree, is suitable for supporting soft rock and large-ground pressure and large-deformation underground engineering, and is widely used for supporting mine roadways, traffic tunnels and underground engineering such as water conservation, national defense and the like, and the labor intensity of workers is low.

Description

technical field [0001] The invention relates to underground engineering support, in particular to a combined support system and construction method of shrinkable concrete slabs and bolts. Background technique [0002] Traditional underground soft rock well roadways and chambers, and mining roadways that are greatly affected by mining pressure generally use anchor net cables, shotcrete, steel supports, masonry and their combinations to support the surrounding rock. The rigidity of anchor net cable support is not high, and the muddy surrounding rock is prone to cementation, which will lead to the failure of anchor cable anchorage; the shotcrete support has low strength and large dust; the cost of steel support is high; Great deformation. Soft rock roadways generally adopt secondary support, the primary support generally adopts anchor net spraying, and the secondary support adopts shotcrete, masonry, steel bracket or grouting. The construction speed is slow, the process is com...

AI Technical Summary

Problems solved by technology

The rigidity of anchor net cable support is not high, and the muddy surrounding rock is prone to cementation, which will lead to the failure of anchor cable anchorage; the shotcrete support has low strength and large dust; the cost of steel support is high; large deformation

Soft rock roadway generally adopts secondary support, the primary support generally adopts anchor net spraying, and the secondary support adopts shotcrete, masonry, steel bracket or grouting, the construction speed is slow, the process is complicated, the labor intensity is high, and the cost is high

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