Grouting reinforcement method for ground drilling to coal seam broken roof and grouting apparatus

摘要

A grouting reinforcement method for ground drilling to coal seam broken roof and a grouting apparatus are provided in the present invention. The present invention adopts the method for grouting reinforcement by drilling from ground to coal seam broken roof, which has a larger operation space, don't need special hole sealing reduces the technical difficulty of drilling and grouting and overcomes the disadvantages of original underground grouting, that is, there is larger limit on drilling angle, grouting range is small, the hole sealing is difficult, the grout is easy to flow out, and the grouting effect is bad and the like. The method for grouting of the present invention comprises arranging density, depth and diameter of boreholes and drilling holes in turn according to the situation of coal seam broken roof and ground; selecting suitable grouting material and grouting using the grouting device in the present invention. In the grouting device is of the present invention, the raw material is sucked up using metering pump so that proportion of raw material is accuracy, and a pressure gauge and flowmeter are disposed so that grouting pressure and quantity of flow are stable and controllable. The diffusion area of slurry is large, the grouting effect is good and porous grouting achieves the full cover on the broken roof, the overall strength of 20 extremely thick and quite thick coal seam broken roof is greatly improved.