Three-blocking two-segment type grouting sealing hole pressure measuring structure and construction method thereof

Abstract

The invention discloses a three-blocking two-segment type grouting sealing hole pressure measuring structure which comprises a grouting sealing hole pressure measuring structure body (1). A pressure measuring chamber (9) is located at the forefront end of the grouting sealing hole pressure measuring structure body (1). A pressure measuring steel pipe (2) is located in the grouting sealing hole pressure measuring structure body (1) and communicated with the pressure measuring chamber (9). The three-blocking two-segment type grouting sealing hole pressure measuring structure is characterized in that the pressure measuring steel pipe (2) sequentially passes through 1# marithan fixing segments (10), 1# cement fixing segments (5), a 2#marithan fixing segment (12), a 2# cement fixing segment (14) and a 3# marithan fixing segment (13) from interior of the grouting sealing hole pressure measuring structure body (1) to exterior of the grouting sealing hole pressure measuring structure body (1) and is fixed to the middle of the grouting sealing hole pressure measuring structure body (1).

Description

technical field [0001] The invention belongs to coal mine grouting hole sealing pressure measurement technology, in particular to a three-block two-stage grouting hole sealing pressure measurement structure and an implementation method thereof. Background technique [0002] Coal seam gas pressure is one of the important indicators reflecting coal and gas outburst. Accurate measurement of coal seam gas pressure is the basis and important basis for the design and implementation of various safety measures for mine gas prevention and control. To accurately measure the gas pressure of coal seam, the drilling Sealing quality is very critical. In actual production, in order to measure the gas pressure of the protected layer, limited by engineering conditions, it is sometimes necessary to construct a downhole to measure the gas pressure of the protected layer. During the construction of the downhole, affected by the water accumulation in the borehole, the downhole It is difficult t...

AI Technical Summary

Problems solved by technology

In actual production, in order to measure the gas pressure of the protected layer, limited by engineering conditions, it is sometimes necessary to construct a downhole to measure the gas pressure of the protected layer. During the construction of the downhole, affected by the water accumulation in the borehole, the downhole It is difficult to measure the pressure of surrounding rocks with excess water, and the commonly used method of grouting and sealing holes can no longer accurately measure the gas pressure of coal seams

[0003] The traditional grouting sealing hole pressure measurement technology has the following problems: (1) Malisan is artificially poured directly on the cotton yarn, the mixing degree of Malisan is not uniform, and the reaction foaming effect cannot meet the test and actual requirements;

[0004] (2) When the piezometric tube is sent into the hole, the marisan on the cotton yarn will be washed away by the accumulated water in the hole, and the marisan will be taken away with the water, so that the marisan will fail and the cement mortar will enter the pressure measuring chamber lead to sealing failure;

[0005] (3) When the cement mortar is solidified, due to the influence of accumulated water in the hole or crack water in the surrounding rock, the solidification time is too long and shrinks after solidification, and the hole wall is not fully sealed;

[0006] (4) The orifice is not sealed with Malisan, and the cement mortar shrinks after solidification, which may cause air leakage from the orifice

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