Bag-type blockage non-stop construction technique for fuel gas cast iron pipe and its special clip tee joint

Abstract

The invention discloses a special clip tee joint for bag-type blockage non-stop construction of fuel gas cast iron pipe, at least comprising a first upper clip for lower blocking bag, a second upper clip for lower baffle and a lower clip; the first upper clip and the second upper clip are arranged on the two ends of the lower clip, respectively and enclose the fuel gas cast iron pipe together; the inner surface of the first upper clip, the second upper clip and the lower clip are bonded with a rubber cushion. The special clip tee joint of the invention adopts the above structure to realize mechanical connection between tapping, bag dropping and baffle dropping devices and the fuel gas cast iron pipe through a sandwich valve, during the non-stop construction of fuel gas cast iron pipe, so as to solve the technical problem that the steel short section cannot be used for the non-stop construction of fuel gas cast iron pipe, due to poor welding property of the cast iron pipe. The invention also discloses a Bag-type blockage non-stop construction technique for fuel gas cast iron pipe.

Description

technical field [0001] The invention relates to the technical field of gas transportation, in particular to a construction technique of gas cast iron pipe capsule sealing without transmission and a special clip tee. Background technique [0002] With the development of gas pipeline construction technology and the increasing demand of users for non-stop construction, various forms of non-stop construction technologies have emerged. [0003] When the gas pipeline is rerouted, it is generally necessary to connect bypass pipes at both ends of the construction area to ensure the normal operation of the gas pipeline network before the old pipe is broken, and then block the two ends of the construction area with blockers. Broken pipes and other constructions to realize the non-stop transmission and rerouting construction of gas pipelines. [0004] The principle of non-stop construction technology of various forms of pipelines is the same, all of which use various forms of blockers...

AI Technical Summary

Problems solved by technology

But for the situation that the main gas pipeline is a cast iron pipe, because the weldability of the cast iron pipe is very poor, the clip tee in the prior art (steel nipple for connecting the bypass pipe) cannot be directly welded on the cast iron pipe, so So that the existing non-stop construction technology can not be applied to the gas cast iron pipe

[0007] Therefore, there is currently no feasible construction technology for the non-stop construction of cast iron pipes

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