Grotto preliminary bracing construction method adopted when underground water seeps

Abstract

The invention discloses a grotto preliminary bracing construction method adopted when underground water seeps. When the underground water gushes or seeps like dots, a pipe orifice of a rubber pipe is sawed into a bevel, the pipe orifice is wrapped in geotexile fabric with high water permeability, and the oblique pipe orifice of the rubber pipe is aligned with a water gushing port. When the underground water gushes or seeps like a line, a water-permeable pipe section is wrapped in the geotexile fabric with high water permeability, the water-permeable pipe section is pressed on the line-shaped water gushing port, a lead wire is wound around the rubber pipe, so that the rubber pipe is bound to form a pipe sleeve, and the pipe sleeve is fixed to a rock face through a long steel nail. When the underground water gushes or seeps like a surface, the underground water is collected through a rubber horn mouth. After a drainage facility is arranged, concrete is sprayed in time for bracing, wherein the concrete is sprayed along the circumference of the water gushing port in circles first, and the spray circles are reduced towards the water gushing port step by step till the drainage facility, except the exposed section, is embedded into the concrete. The grotto preliminary bracing construction method adopted when the underground water seeps has the advantages that according to different underground water conditions and the blockage and drainage combination principle, the anchor-plate retaining technology is improved, and the preliminary bracing effects of technical feasibility, quick bracing, economical efficiency and practicability are achieved.

Description

Technical field [0001] The invention belongs to the technical field of bolting and shotcrete support, and particularly relates to a construction method for initial support of a cavern when groundwater seeps out. Background technique [0002] The biggest problem during the construction of underground caverns is the influence of groundwater on the stability of caverns, especially soft rock (soil) caverns. Groundwater is an important reason for the collapse and shedding of surrounding rock (soil) on the cave wall. The cave must be excavated as soon as possible Implement the initial support of the cavern. However, there is still no good method for groundwater treatment. In the initial implementation of sprayed concrete support, due to the effect of water seepage, the support effect is poor, resulting in greater collapse under the effect of underground water seepage. [0003] The existing methods are mainly to take simple measures such as the combination of blockage and drainage, incre...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of cavern primary support construction method when there is groundwater seeping out, aiming at solving the problem that the cost of primary support methods such as the combination of simple plugging and draining, increasing the amount of quick-setting agent and increasing the amount of sprayed concrete is relatively high. high problem

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