Combined anti-leakage anchor net spray support and construction method

Abstract

Combined anti-leakage anchor net spray support and construction method, the combined anti-leakage anchor net spray support includes a leak-proof layer, a temporary reinforcement net, a permanent reinforcement net, inner and outer double anchor plates and a sprayed concrete layer, from the excavation surface From the outside to the inside, there are leak-proof layer, temporary reinforcement net and permanent reinforcement net; when there is water in the excavation surface, the leak-proof layer adopts steel plates and supporting construction water-guiding measures; when there is no water in the excavation surface, the leak-proof layer adopts steel wire network. The invention also includes the construction method of the combined anti-leakage anchor net spray support. Utilizing the invention can ensure the stability of underground engineering in weathered and broken rocks and water-containing surrounding rocks.

Description

technical field [0001] The invention relates to underground engineering supports such as mines and tunnels, in particular to a combined anti-leakage anchor net spray support and a construction method. Background technique [0002] In underground engineering fields such as mine roadways and tunnels, support needs to be carried out after excavation, and anchor-mesh support and anchor-mesh spray support are the mainstream support forms and have been widely used. In anchor mesh support and anchor mesh spray support, the anchor rod is an anchor plate anchor rod, and the mesh is generally made of steel mesh, steel bar diameter 6 to 10mm, mesh size 100 to 200mm or so, and the sprayed layer is shotcrete ( sprayed concrete). There is no concrete protective layer for the steel bars in the anchor net support, which is generally used for underground projects with a short service life; the anchor net spray support adds a sprayed concrete layer on the basis of the anchor net support, and...

AI Technical Summary

Problems solved by technology

[0003] Relevant scholars have optimized the support forms of conventional anchor net and anchor net spraying. Rods, anchor cables, polyester fiber mesh, metal mesh, and concrete are laid in the form of two layers of polyester fiber mesh sandwiching a layer of metal mesh. The mesh shape of the polyester fiber mesh used is arc-edge rectangle, and the mesh size is 15mm; the shape of the metal mesh is rhombus, the mesh size is 100×200mm, the construction sequence is to hang the composite mesh first and then spray the concrete. The main purpose is to provide a certain support deformation through the three-layer mesh structure; Analytical and Numerical Analysis of a New Composite Bolt-Mesh Support Structure" (Master's Thesis of Anhui University of Science and Technology, 2013.06) provides a double-disk double-bolt support structure, which is essentially a two-layer ordinary anchor-mesh spray support structure, which is constructed first The first layer of anchor nets, anchor rods, and sprayed concrete, followed by the construction of the second layer of anchor nets, anchor rods, and sprayed concrete, will substantially increase the support strength, but will result in a substantial increase in support costs.

[0004] There are a large number of weathered, broken and water-bearing rock masses in the underground engineering. In the conventional anchor net or anchor net spray support, the broken rock mass falls from the mesh holes. As a result, the concrete spraying operation cannot be carried out, and the second is that the bolt support fails due to the upward fall, which leads to the instability of the underground project

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