Double-layered cavity inner fiber web reinforced grouting full-length reinforced freezing pipe and construction method thereof

Abstract

The invention discloses a double-layered cavity fiber web reinforced grouting full-length reinforced freezing pipe and a construction method thereof. The pipe mainly comprises a main body structure with steel pipes with large and small diameters in sleeve connection to form a cavity of inner and outer walls, a bottom taper angle device connecting the inner and outer steel pipe walls of the main body structure and an inner and outer pipe top port sealing device. The bottom taper angle device is also of a double-layered cavity structure communicated with the cavity of the main body structure, and the bottom taper angle device is internally provided with a one-way backstop pressure valve communicated with the inside of the freezing pipe and the cavity. According to the design, by means of matched operation of a liquid feeding pipe and the one-way backstop pressure valve, cement slurry is injected into the cavity of the main body structure, and a pre-placed fiber web is placed to form fiber web reinforced concrete. The stiffness, the strength and the corrosion resistance of the freezing pipe are greatly improved. The freezing pipe is suitable for the stratum freezing method construction project subjected to complex high stress and aqueous corrosion, effectively reduces the accident probability of freezing wall melting due to salt leakage caused by damage and fracture caused by thecorrosion and the high stress, and avoids inducing flooding accidents.

Description

technical field [0001] The invention relates to a full-length reinforced freezing pipe for fiber net reinforced grouting in a double-layer sandwich cavity and a construction method, belonging to the field of stratum freezing engineering. Background technique [0002] The fracture of the frozen pipe is always the key to the construction safety of the artificial ground freezing method. Once the frozen pipe breaks, it will cause the leakage of brine and the melting of the frozen wall. Accidents frequently occur in underground engineering such as frozen sinking and frozen shields. [0003] Practice has proved that most of the fractures of frozen pipes occur at the joints, but fractures will also occur at other locations that are subject to greater ground stress and severe water corrosion, and disasters will only be discovered when salt water leaks out, which has caused huge safety hazards. Hidden dangers and economic losses have been studied for a long time to increase the stren...

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Problems solved by technology

[0003] Practice has proved that most of the fractures of frozen pipes occur at the joints, but fractures will also occur at other locations that are subject to greater ground stress and severe water corrosion, and disasters will only be discovered when salt water leaks out, which has caused huge safety hazards. Hidden dangers and economic losses have been studied for a long time to increase the strength of the freezing tube by various means, but accidents still occur frequently

The main reason is that although new-type joints can reduce fracture accidents, they still cannot be completely eliminated, especially in projects where the depth of alluvium and loose layers is greater, the environment with high ground stress, and the hydraulic action are more serious. , flexural and corrosion resistance can not meet the requirements

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