A construction method of primary support for caverns when groundwater seeps out

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 spraying support, and in particular relates to a construction method for initial support of caverns when groundwater seeps out. Background technique [0002] The biggest problem in the construction of underground caverns is the impact of groundwater on the stability of the cavern, especially in soft rock (soil) caverns. Groundwater is an important reason for the collapse and shedding of the surrounding rock (soil) on the cavern wall. The cavern must be excavated as soon as possible. Implement initial support for caverns. However, there is still no good way to deal with groundwater at present. When sprayed concrete support was implemented in the initial stage, the support effect was poor due to water seepage, which caused greater collapse under the action of underground water seepage. [0003] The existing method mainly adopts the combination of simple plugging and drainage, increasing the set...

AI Technical Summary

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

Images