Broken surrounding rock and soft rock roadway U-shaped steel sleeve shed support method
A technology for crushing surrounding rock and section steel, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as increased roadway maintenance costs, non-uniform action, and accelerated roadway destruction, so as to reduce roadway maintenance costs, improve stability and The effect of support strength
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[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.
[0022] The invention provides a U-shaped steel sheathing support method for broken surrounding rock and soft rock roadway, and the specific steps are as follows:
[0023] Step 1: After the tunnel 1 is excavated, knock on the roof immediately, drill holes for anchor cables in the roof and surrounding rock of tunnel 1, and install anchor cables 2 with strong prestress. The length of high-strength prestressed anchor cables 2 is 6m, and the row spacing 1200×1200mm, pre-tightening force 55~80KN; metal mesh 15 is hung on the surrounding rock surface and steel bar ladders 16 are arranged at right angles. Install the anchor cable tray 3 and make it...
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