Non-sprayed-concrete anchor net supporting method of underground construction broken surrounding rocks

Abstract

The invention discloses a non-sprayed-concrete anchor net supporting method of underground construction broken surrounding rocks. According to the method, eight anchor rod drill holes are formed in a roadway or a tunnel, and each row of holes are basically required to be located on the same cross section; a galvanized high-strength steel wire net prepared in advance is attached to the rock surface to be paved, so that a whole roadway or tunnel non-sprayed-concrete anchor net is supported to form a whole; tube seam type anchor rods are pressed into the anchor rod drill holes by an anchor rod mounting machine sequentially from one side of the roadway or the tunnel to the vault and the other side of the roadway or the tunnel. The method is low in cost, good in supporting effect, timely in supporting and low in labor intensity.

Description

technical field [0001] The invention belongs to the technical field of underground engineering support, and mainly relates to underground engineering requiring short-term support such as mine roadways and temporary tunnels, and is a bolt-mesh support method for roadways without sprayed concrete when the surrounding rock is relatively broken. Background technique [0002] For the support of relatively broken surrounding rock in underground engineering, the support methods generally adopted are spray anchor support, metal support support, masonry support, pressure relief support and other support methods. The most commonly used is the sprayed anchor mesh support, and the sprayed anchor mesh combined with metal support. After adopting these supports, the support strength of roadways and temporary tunnels has been improved to a certain extent, but there are some problems, the most important is for short-term temporary tunnels. Support, borrowing the way of permanent support, the...

AI Technical Summary

Problems solved by technology

The most commonly used is the sprayed anchor mesh support, and the sprayed anchor mesh combined with metal support. After adopting these supports, the support strength of roadways and temporary tunnels has been improved to a certain extent, but there are some problems, the most important is for short-term temporary tunnels. Support, using permanent support, the cost is too high and the process is more complicated

For example, due to the rebound of concrete in the spray anchor net support process, the actual amount of concrete has increased compared with the design amount, which increases the support cost; the support materials cannot be recycled after the mine roadway and temporary tunnel are used. ; The recovery roadway will increase the degree of ore dilution during the recovery process, which affects the technical and economic effects of mining; the required support materials must be transported from the outside of the well, and the sprayed concrete support increases the labor intensity, thus making the support Maintenance costs have also increased

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