Soft rock roadway anchored concrete filled steel tube anti-floor heave device and construction method thereof

Abstract

The invention discloses a soft rock roadway anchored concrete filled steel tube anti-floor heave device and a construction method thereof. The construction method comprises the following steps: punching pile holes at the two sides of the floor of a roadway, embedding a steel tube body in the pile holes, pouring cement mortar, fixing the steel tube body in the pile holes, pouring concrete in the steel tube body to form a steel pipe pile, enabling an anchor rod or an anchor cable to penetrate the through holes of the steel tube pile and be anchored in rock formation at the two base angles of the roadway, sheathing cushion blocks, and fastening by nuts to form an anchoring structure. The invention can effectively control the roadway floor heave, improve stress distribution, and have the advantages of simple and convenient construction process, low cost, short time limit, superior cost performance, and stable physical mechanical properties.

Description

technical field [0001] The invention relates to a support device for a mine roadway, a traffic tunnel and a water conservancy culvert, in particular to a support device for a soft rock roadway. Background technique [0002] my country's coal resources buried below 1000m are about 24,500 trillion tons, accounting for 53.2% of the total coal resources. At present, the mining depth of coal mines is increasing at a rate of 8-12m per year, and the mines in the east are developing at a rate of 100-250m every 10 years. increase, we have to face a difficult problem—high-stress soft rock. The problem of soft rock has been raised as a worldwide problem since the 1960s, especially the problem of high-stress soft rock in coal mines has always been one of the major problems that plague the production and construction of coal mines. [0003] At present, in underground engineering, roadways are often constructed in soft rocks, and roadway undercut is a common form of deformation and fail...

AI Technical Summary

Problems solved by technology

Although the reinforcement method can play a certain role in suppressing swell, in roadways with a strong tendency to sag, not only the material consumption is large, the support cost is high, but also it cannot really play a role in controlling sag

The reason is that the reinforcement method can only passively maintain the bottom slab. Under the conditions of high stress and soft bottom slab, the bottom beam of the closed bracket often cannot fully exert its bearing capacity, causing it to bulge into the roadway and lose the ability to control the bottom slab

In many cases, floor bolts fail due to insufficient anchoring force due to poor anchorage in soft floor rock formations or a mismatch between the amount of extension and the amount of sill

Although floor grouting can improve the strength of the shallower rock formations of the floor, if the grouting fails to reach the failure depth of the floor strata, the upper reinforced rock strata will be lifted up by the lower strata. Therefore, the role of grouting in controlling the bottom is also limited. of

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