Roadway tunneling construction method for coal mine overpass air bridge

Abstract

The invention provides a roadway tunneling construction method for a coal mine overpass air bridge, and relates to the technical field of mine roadway tunneling. The method comprises the following steps that A, a foundation trench is excavated in an upper roadway according to an overpass position calibrated by mine geodesic survey; B, transverse I-shaped steel is laid at the bottom of the foundation trench, and a first longitude and latitude net is laid above the I-shaped steel; C, longitudinal I-shaped steel is laid above the first longitude and latitude net, and the transverse I-shaped steeland the longitudinal I-shaped steel are welded and fixed through anchor rods; D, a second longitude and latitude net is laid above the longitudinal I-shaped steel, and the two layers of longitude andlatitude nets are fixedly connected through iron wires and anchor rods; E, after concrete is poured into the foundation trench to manufacture an upper roadway false bottom, a lower roadway is tunneled; F, a steel plate is laid above an I-shaped steel frame shed of the lower roadway after the lower roadway is tunneled and passes through the overpass position; and G, the two side faces of the lowerroadway are subjected to side face expansion, wall building is carried out, and concrete is poured to manufacture a lower roadway false roof. The method simplifies the air bridge tunneling construction procedure, also can effectively prevent air escape branches, and roadway support is safer and more stable.

Description

technical field [0001] The invention relates to the technical field of mine roadway excavation, in particular to a coal mine overpass wind bridge roadway excavation construction method. Background technique [0002] In coal mine ventilation structures, the wind bridge is a ventilation structure that separates the inlet air and the return air when the air inlet lane and the air return lane in the ventilation system need to cross horizontally. The location of the mine overpass air bridge is prone to air leakage due to the short distance between the overpass roadways, and the two roadways of the overpass roadway are the air inlet roadway and the air return roadway. When air leakage occurs, the ventilation system will often be short-circuited. In order to avoid the short circuit of the overpass wind bridge, the existing construction method is to directly pour a concrete wind bridge between the upper overpass roadway and the lower overpass roadway. The concrete wind bridge has a ...

AI Technical Summary

Problems solved by technology

In order to avoid the short circuit of the overpass wind bridge, the existing construction method is to directly pour a concrete wind bridge between the upper overpass roadway and the lower overpass roadway. The concrete wind bridge has a compact structure and is relatively strong, but the construction of the concrete wind bridge is complicated. Large quantity and high cost

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