Method for assisting sliding, floating and down-ditching of pipeline by air bags

Abstract

The invention relates to a method for assisting sliding, floating and down-ditching of a pipeline by air bags and belongs to the technical field of underground pipeline paving construction. The method comprises the following basic construction procedures: preparing to construct, digging a pipeline ditch and injecting water into the pipeline ditch, jacking the pipeline by the air bags, performing down-ditching on the pipeline, recycling the air bags and pumping water from the pipeline ditch, and stabilizing the pipeline and backfilling the pipeline ditch, and is technically characterized by comprising the following steps of: performing assembly, welding, detection and corrosion prevention on the pipeline; welding blind plates at both ends of the pipeline to plug the two ends of the pipeline; digging the pipeline ditch on one side of the pipeline and injecting water into the pipeline ditch; placing a plurality of air bags under the pipeline and inflating the air bags to jack the pipeline and make the pipeline away from a pipeline pier; hoisting the pipeline to make the pipeline move towards the pipeline ditch by using a pipeline hoister, so that the pipeline slides to the pipeline ditch and floats on the water; recycling the air bags and pumping the water from the pipeline ditch, so that the pipeline falls to the bottom of the ditch; and stabilizing the pipeline and backfilling the pipeline ditch. By the method, the problem of down-ditching of large-aperture pipelines paved in water net areas is solved; compared with a method for performing down-ditching by the union of a plurality of pipeline hoisters, the method has the advantages of occupying a small area, saving equipment, reducing energy consumption and construction cost and improving working efficiency; furthermore, the corrosion prevention layer of the pipeline is free from damage, and the method is more safe and reliable.

Description

(1) Technical field [0001] The invention relates to a construction method for laying pipelines under the ground. The pipelines are welded on site to form long sections and are continuous. Specifically, it is an airbag-assisted pipeline sliding and floating down-ditch method. (2) Background technology [0002] In the construction process of laying large-diameter long-distance pipelines, the trenching of pipelines is one of the important processes. In the past, the ditching of large-diameter long-distance pipelines on land was generally carried out by combining multiple pipelayers. This ditching method not only requires a large amount of heavy machinery and equipment, but also requires a wide construction site, which increases the construction cost, and it is difficult to coordinate and command the joint operations on site, the construction progress is slow, and the safety is poor. Sometimes the method of "V"-shaped excavation and trenching is adopted, that is, multiple tren...

AI Technical Summary

Problems solved by technology

After searching the patent literature, no pipeline trench construction method suitable for water network areas has been found so far

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