Suck-back prevention and deposition prevention grouting process and device for deep waterlogged sand layer

Abstract

The invention provides a suck-back prevention and deposition prevention grouting process and device for a deep waterlogged sand layer. The grouting device comprises an outer grouting tube and a grouting core tube. The grouting core tube is sleeved with the outer grouting tube through a threaded sleeve. Multiple sets of grout outlets are cut in the periphery of the outer grouting tube. Multiple rubber sleeves covering the grout outlets are arranged on the outer grouting tube. According to the suck-back prevention and deposition prevention grouting process and device, the procedures are simple, and operation is convenient; grouting is conducted on the deep waterlogged and thawed sand layer accurately through ground drilling, grouting pressure can be selected, and grout cannot be sucked back into the grouting tube after grouting is stopped. In addition, the situation that an effective grouting layer section or the grout outlets in the grouting tube are blocked due to the fact that the grout deposits at the bottom of the grouting tube can be effectively prevented; the grouting tube is cleaned with clean water after grouting is completed, grouting holes and the grouting tube can be utilized repeatedly, and repeated intermittent grouting can be conducted on a stratum.

Description

technical field [0001] The invention relates to the technical field of water and sand inrush control in coal mine shafts, in particular to a grouting process and a grouting device for preventing suction and sedimentation in deep and thick water-saturated sand layers. Background technique [0002] When coal mine shafts (vertical shafts or inclined shafts) pass through deep and thick water-saturated sand layers, in order to improve the efficiency of shaft excavation and prevent water and sand from pouring into the shaft excavation face, freezing method is one of the more commonly used stratum treatment methods. Use the freezing method to freeze the water-saturated sand layer within a certain range of the formation that the wellbore passes through, solidify the flowable water and loose sand into a stone-like body, and then carry out the wellbore excavation operation in this kind of stone body, so that the wellbore The excavation operation face will maintain a relatively stable ...

AI Technical Summary

Problems solved by technology

In the technology of using grouting for sand consolidation, when grouting from ground boreholes to deep and thick water-saturated sand layers, conventional grouting devices and processes are used, and the grout will often flow back into the grouting pipe under high hydraulic pressure. , and bring in mud and sand to block the grouting pipe, resulting in the impossibility of secondary grouting

In addition, due to the segregation of grout, thicker grout is easy to accumulate at the bottom of the hole or the bottom of the grouting pipe, which shortens the effective layer of the grouting hole and the grouting pipe, and the grouting effect is not good

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