Lubrication slurry grouting jet nozzle used for culvert jacking

Abstract

The invention relates to a lubrication slurry grouting jet nozzle used for culvert jacking. An outer shell is of a tubular structure, the diameter of an upper pipe of the outer shell is larger than that of a lower pipe of the outer shell, the two pipes with different diameters change the diameters in a smooth and transitional mode, wherein internal threads are machined on the pipe opening of the inner wall of the upper pipe of the outer shell and the middle of the upper pipe of the outer shell, the interior of the outer shell comprises a check valve core assembly, the check valve core assembly is composed of a hard plastic valve seat, a soft plastic valve plate, a limiting pull rod, a return spring, an elastic steel press foot, a stainless steel mud guard, a rubber washer, a sealing ring, a guiding sleeve outer pipe and a guiding sleeve core pipe, the hard plastic valve seat is a supporting body for installing other parts, external threads are machined on the outer wall of a cylindrical base, and the check valve core assembly is fixed on the inner wall of the outer shell through the threads. The lubrication slurry grouting jet nozzle used for the culvert jacking has the advantages of being strong in applicability, few in the number of using of the connecting pipe fittings, short in grouting pipeline maintaining time, low in grouting pipeline maintaining cost, easy to install, and capable of being used for the most tail end of a lubrication grouting pipeline system in culvert body non-excavating and culvert jacking constructing operation and having the effects of preventing soil and impurities from blocking a grouting pipeline.

Description

technical field [0001] The invention relates to a grouting nozzle, in particular to a lubricating grouting nozzle for a top culvert, which is used at the end of the lubricating grouting pipeline system for trenchless jacking culvert construction operations, and has the function of preventing soil and sundries from clogging the grouting The role of the pipeline. Background technique [0002] In the top culvert construction technology, due to the continuous injection of lubricating slurry during the jacking stage, a lubricating slurry sheath needs to be formed around the top culvert to reduce the jacking resistance and ensure that the sheath slurry maintains a certain pressure. In this way, the jacking task can be successfully completed. If there is backflow, it will cause pressure loss and failure to maintain pressure. The soil around the jacking culvert will directly act on the outside of the culvert, and the frictional resistance will increase sharply. Therefore, in...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the characteristics of the trenchless jacking process, to provide a lubricating grouting nozzle for jacking culverts, which is used for lubricating grouting in trenchless jacking culvert construction operations The end of the pipeline system is used to solve the problem that the soil and debris enter the valve body to block the grouting pipeline before and after the top culvert enters the soil, resulting in the failure of the grouting pipeline

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