Shallow reinforcement and deep injection supporting method for rapid excavation of broken roof large-section roadways
A broken roof and large-section technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve anchor breakage, difficult to meet the large deformation support requirements of soft rock roadways, U-shaped steel shrinkable support has limited shrinkage, etc. question
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[0052] Such as figure 1 As shown, a shallow-solid deep-grouting support method for rapid excavation of a large-section roadway with a broken roof includes the following steps:
[0053] (1) Superficial glue injection reinforcement process:
[0054] 1.1) Construct a vertical upward shallow borehole 3 to the broken roof 2 in the roadway 1, the vertical depth of the shallow borehole 3 is greater than 2.6 meters and less than or equal to 3 meters, and then insert multiple holes into the shallow borehole 3 Identical and vertical hollow conduits with openings at both ends, adjacent conduits are fixedly connected end to end and the vertical midlines of the conduits are coincident, a plurality of conduits form a total conduit, and the vertical height of the total conduit is equal to the vertical height of the shallow borehole 3 depth, and there are multiple overflow holes on the side wall of the conduit at the uppermost end, and then the main conduit is connected to the injection pump...
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