Shallow biogas cavity automatic identification and filling equipment and biogas cavity grouting and filling construction method

Abstract

The invention discloses automatic identification and filling equipment for a shallow biogas cavity. The automatic identification and filling equipment comprises a grouting pump, a grouting pipeline, a static sounding device and a data acquisition system, wherein a display displays front-end resistance of a static sounding probe on the display in real time through a data line, when the detected front-end resistance is suddenly changed and reduced, the cavity is found, the grouting pump automatically starts grouting, and when slurry flows through the grouting pipeline and reaches a lower steel pipe opening, the cavity is injected from a grouting hole in the wall of the lower steel pipe, and the cavity is filled with the slurry; at the moment, the resistance measured by the probe rises again, the grouting pump is automatically closed, and during grouting, gas in the cavity is exhausted from the ventilation pipeline and stored in the gas storage bag. The invention further discloses a construction method for conducting biogas cavity grouting filling through the shallow biogas cavity automatic recognizing and filling equipment. The equipment can conduct grouting and exhausting operation according to end resistance induction.

Description

technical field [0001] The invention relates to an automatic identification and filling device for a shallow biological gas cavity. The invention also relates to a construction method for filling biogas cavities by grouting using the above-mentioned automatic identification and filling equipment for shallow biogas cavities. Background technique [0002] Shallow biogas refers to the methane-rich gas formed by the action of anaerobic microorganisms in the reducing environment of organic matter rich in stratum sediments. Biogas generally exists in the form of tiny air pockets or cavities in the soil, and is mainly distributed in the coastal areas of Jiangsu and Zhejiang, the Yangtze River Delta, and the Qaidam Basin in China. [0003] During the survey and construction process, because shallow gas is flammable and will cause suffocation when the concentration is high, it poses a potential threat to the personal safety of exploration operators and the surrounding environment; a...

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Problems solved by technology

[0003] During the survey and construction process, because shallow gas is flammable, and when the concentration is high, it will cause suffocation of personnel, which may pose potential hazards to the personal safety of exploration operators and the surrounding environment. At the same time, in the cavity of silt soil layer, shallow gas is released under uncontrolled or improper control conditions, which can easily cause strong blowout and take away a large amount of mud and sand, causing large-scale subsidence of the formation; while in the clay layer, large The release of gas in the cavity of the volume will significantly change the stress distribution of the soil layer, severely disturb the overlying soft soil, cause the weakening of the soil strength, and increase the maintenance cost of the project

[0004]The existing technology generally judges whether there is a cavity in the air-bearing soil layer through drilling and then through the soil core fault, and then performs natural exhaust. Excessive deformation or even instability of the soil structure in the upper part of the cavity; even if grouting measures are taken after exhausting, the soil structure will still be disturbed to a certain extent due to the step-by-step drilling and grouting, resulting in a decrease in soil strength and irreversible deformation even unstable

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