Mine grouting technology and device with hole opening closed and circulation performed in hole

Abstract

The invention relates to the field of mine grouting, in particular to a mine grouting technology and device with a hole opening closed and circulation performed in a hole. According to the technology, an advanced mode is adopted for performing segmented drilling and grouting from top to bottom till a preset drilling depth is achieved, and finally, the drilled hole is sealed through thick slurry; the drilling and the grouting of each segment subjected to grouting include the steps that a, after the hole is drilled and washed, the top end of a slurry jet pipe is connected with an active drill pipe of a drill rig and lowered into the hole, then, the hole opening is closed, a high-pressure hose connected with the active drill pipe is connected with a flow meter sequentially through a slurry feeding pipe, a grouting pump and a tee joint so that a slurry inlet pipe can be formed, and a hole opening closing device is connected with a slurry returning pipe sequentially through a pressure gage, a pressure meter and a high-pressure slurry returning valve so that a slurry returning pipeline can be formed; b, the drilled hole is washed, then a pump-in test is performed and intermittent grouting is performed. The mine grouting technology and device with the hole opening closed and circulation performed in the hole are good in grouting effect and suitable for grouting of holes in different hole depths.

Description

technical field [0001] The invention relates to the field of mine grouting, in particular to a mine grouting process and device for internal circulation of closed orifices. Background technique [0002] my country currently has more than 100,000 mines, many of which are basically completed due to the mining of shallow ore bodies, and the mining depth is developing in depth. Large, there is a major safety hazard of water inrush and flooding of the well. On July 17, 2001, a serious flooding accident occurred in Lajiapo Mine, Nandan County, Guangxi, killing 81 miners. On March 28, 2010, 38 miners were killed in a water flooding accident at the Wangjialing Coal Mine in Shanxi Province. Severe flooding directly leads to low recovery rate of ore bodies, resulting in a large waste of mineral resources. At the same time, a large amount of pumping and drainage of groundwater leads to a great waste of groundwater resources, and even serious environmental and geological problems such ...

AI Technical Summary

Problems solved by technology

[0005] The whole hole filling of the lower shot pipe is to drill the borehole to the predetermined depth according to the design requirements, and after the borehole is washed clean, the shot pipe is lowered into the injection section. The shot pipe is generally made of plastic pipe, and the shot pipe and the orifice The installed high-pressure grouting sealer is connected, and the grout is sent to the inlet of the bore hole sealer through the grouting pump and the grouting pipeline. The grout enters the injection section directly along the grouting pipe. The advantage of this method is that the grout directly enters the injection section. , to reduce the dilution and segregation of the grout by groundwater. However, when using this method for grouting, due to the development of karst fissures in the mine, the grout consumption is relatively large. Intermittent grouting is often used, that is, a certain amount of grouting is poured for a period of time, and the sweeping After the hole is poured, the grout pipe remains in the borehole due to the solidification of the grout, and the grout pipe must be replaced every time the grout is injected, which consumes a lot of grout pipe and increases the difficulty of sweeping the hole; section, it is also necessary to scan the hole repeatedly, which greatly increases the workload of the hole scan

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