2results about How to "Reduce grouting time" patented technology

This invention belongs to the field of grouting reinforcement technology for fractured surrounding rock, and discloses a directional grouting reinforcement method for fractured surrounding rock around a tunnel. This method aims to solve the problems of large grouting volume, long construction period and high cost caused by the existing grouting methods used for fractured surrounding rock in tunnels. The invention includes: (1) drilling holes into the fractured surrounding rock around the tunnel; (2) inserting grouting pipes into each hole, wherein at least three rows of grouting ports are provided along the length of the grouting pipe, and each row of grouting ports contains multiple grouting ports. The included angle between the two outermost rows of grouting ports on the grouting pipe is 100°-135°, and the grout sprayed from the two adjacent rows of grouting ports on two adjacent grouting pipes in the fractured surrounding rock around the tunnel can form an overlapping area; (3) injecting grout into the grouting pipe, and the grout sprayed from each grouting port of the grouting pipe into the gaps of the fractured surrounding rock to complete the grouting reinforcement of the fractured surrounding rock.

The utility model discloses a kind of inclined coal seam gas extraction borehole multistage sealing structure. Inclined coal seam gas extraction borehole multistage sealing structure includes: extraction pipe, front limiting air bag and rear limiting air bag are installed on the extraction pipe, pressure compensation air bag is installed on the sealing section of the extraction pipe;Grouting pipe and reflux pipe are installed on the rear limiting air bag, one end of the grouting pipe is close to the front limiting air bag, one end of the reflux pipe is close to the rear limiting air bag. The inclined coal seam gas extraction borehole multistage sealing structure provided by the utility model can realize multistage sealing of gas extraction hole by installing front limiting air bag, rear limiting air bag, pressure compensation air bag, grouting pipe and reflux pipe on extraction pipe, has better sealing effect, and effectively reduces grouting usage, saves grouting time.