Double-cavity grout stopping device

Abstract

The double-cavity grout stopping device comprises an outer pipe and a central pipe, the central pipe is coaxially arranged in the outer pipe, and a liquid channel is formed between the outer pipe and the central pipe; a hydraulic telescopic supporting component is installed on the outer wall of the outer pipe in the radial direction of the outer pipe, the free end of the hydraulic telescopic supporting component faces the well wall, and the liquid inlet end of the hydraulic telescopic supporting component communicates with the liquid channel. The end, away from the hole opening, of the outer pipe is fixedly connected with a hydraulic expansion sealing component in a sealed mode, the central pipe is sleeved with the hydraulic expansion sealing component, the other end of the hydraulic expansion sealing component is matched with the central pipe in a sliding and sealing mode, and the hydraulic expansion sealing component is communicated with fluid in the liquid channel. According to the grouting stopping device, the double-cavity connector is designed and can be connected with a double-wall drilling tool, the double-cavity connector is combined with the double-wall drilling tool, the grouting stopping device can be conveniently fed into a deep designated position in a hole, a hydraulic system and a grouting system are matched, segmented scientific and reasonable grouting is carried out on a deep complex stratum, and engineering such as leaking stoppage, water plugging and stratum reinforcement is carried out.

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