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

The invention relates to the technical field of goaf grouting, in particular to a goaf grouting process method based on negative pressure drainage, which comprises the following steps: S1, according to a grouting and filling sequence, constructing N central drill holes in a to-be-filled area, and respectively constructing M circumferential drill holes around each central drill hole at proper intervals; s2, after construction of all the drill holes is completed, hole opening grouting devices are installed at hole openings of the grouting holes; an orifice air extractor is mounted at the orifice of the negative-pressure air extraction hole; s3, after preparation is completed, a pumping and drainage test is started; s4, performing grouting operation; s5, at the last stage of grouting, when the orifice air extractor detects the grouting slurry, the negative pressure pumping and drainage operation is ended; and when the grouting completion standard is reached, the grouting operation of the grouting drilling hole is completed. According to the method, multi-channel synchronous grouting can be achieved, the flowing and diffusing speed of grout in the goaf is increased, the flowing speed of the grout in the goaf is increased through negative pressure drainage while it is guaranteed that the grout is diffused evenly and orderly, and the grouting and filling efficiency is improved.

The application provides a downhole grouting method for plugging a water-conducting space of laterally burned rock, comprising the following steps: determining a water-conducting space of laterally burned rock of a coal seam and a working face to be mined in the coal seam affected by the water-conducting space, and drawing a curtain line of the water-conducting space outside a mining disturbance damage range of the working face to be mined; arranging a plurality of first grouting holes between the curtain line and the burned rock, grouting the first grouting holes, and determining diffusion ranges of slurries with different concentrations; determining a slurry concentration corresponding to a second grouting hole and a diffusion range of a slurry corresponding to the slurry concentration, determining a spacing of the second grouting hole according to the diffusion range of the slurry corresponding to the slurry concentration; arranging a plurality of second grouting holes between the curtain line and the burned rock according to the spacing of the second grouting hole, and grouting the second grouting holes from the working face to be mined according to the slurry concentration corresponding to the second grouting hole. The application improves the accuracy of grouting plugging, reduces the grouting time, saves the amount of grouting slurry, and reduces the grouting cost.