Land bridge method for recovery of pressed coal under highway

Abstract

A dry bridge exploitation method for express highway lower press coals belongs to a method to maintain an express highway being continuously utilized, maintained and recovered during lower press coals exploitation under the express highway. For an express highway, traditional exploitation methods for express highway lower press coals cannot guarantee vehicles normally running on the highway during the underground exploitation. Meanwhile, the traditional methods might either cause traffic shutdown on an express highway, or result in too much recovery cost or too much waste of coals. The invention can fulfill that, before coal layer exploitation influences an express highway, erecting a large-span dry bridge to substitute the express highway segment in serving vehicles during the exploitation; after the exploitation influences are over, perform recovery for the express highway and dismantle the dry bridge to recovery traffic. Therefore, the scheme can fulfill the following targets of the invention: Provide a dry bridge exploitation method for express highway lower press coals, in order to guarantees normal traffic and traffic safety during exploitation of the underground coals; meanwhile, the invention can considerably lower cost of maintenance, curring and recovery for express highways, and moreover, expand press coal exploitation volume and sufficiently utilize resources..

Description

technical field [0001] The invention relates to methods for using, repairing, repairing and maintaining highways during underground coal mining, in particular to a dry bridge method for coal mining under expressways. Background technique [0002] Expressways have strict technical index requirements, such as in plains and micro-hilly areas, the maximum slope is 3%; the minimum limit of convex vertical curvature radius is 11,000 meters, and the general minimum value is 17,000 meters; the minimum value of concave vertical curve radius is 4,000 meters , the general minimum value is 6000 meters; the minimum length of the vertical curve is 100 meters; and so on. When the coal is mined underground on the expressway, a surface subsidence basin will be formed, and its movement and deformation will cause the expressway to produce horizontal tensile deformation, oblique deformation and curvature deformation. Horizontal tensile deformation will cause breaks on the road surface, oblique...

AI Technical Summary

Problems solved by technology

However, for highways with concrete pouring pavement, sensitive foundation deformation, fast driving speed, and expensive construction, it is still impossible to guarantee the normal passage of road vehicles during underground mining.

[0006] Obviously, the above-mentioned traditional methods either make the highway unopenable to traffic, or make its repair cost too high, or waste a large amount of coal resources

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