Non-excavation capacity expansion method for urban old pipelines

Abstract

The invention discloses a non-excavation capacity expansion method for urban old pipelines. The method comprises the steps that old inspection wells at the two ends are transformed into a working pit and a receiving pit correspondingly; an advanced small pipe is inserted into a section of undisturbed soil in the longitudinal direction above the old pipe, and grouting reinforcement is conducted; the old pipe is broken and slag is discharged; the undisturbed soil at the two sides and below the old pipe is annularly excavated in a mode that the tops of the new pipe and the old pipe are flush with each other and slag is discharged, and the section is expanded to form a target pipe hole; the formed target pipe hole is annularly supported and reinforced through an expansion ring until the whole line of the target pipe hole is formed and reinforced; new pipe joints are lowered from the working pit one by one, the first new pipe joint gradually and forwards penetrates through the target pipe hole, the other new pipe joints are lengthened backwards one by one, the new pipe joints are connected in a sealed mode, and corresponding expansion rings are detached before the new pipe joints step by step every time; cement paste is injected into gaps between the new pipe and surrounding soil; and new inspection wells are rebuilt at the two ends of the new pipe, and the working pit and the receiving pit are backfilled. According to the method, the capacity is expanded in a non-excavation mode, the environmental influence is small, the traffic and the life of residents are not influenced, and the construction safety is good.

Description

technical field [0001] The invention belongs to the field of drainage pipeline construction, and in particular relates to a non-excavation expansion method for urban old pipelines. Background technique [0002] Pipeline trenchless repair and renewal technology is one of the best ways to solve the phenomenon of "zipper on the road", which has the advantages of low comprehensive cost, short construction period, small environmental impact, no impact on traffic, no impact on residents' lives, and good construction safety. , Repair and upgrade without excavation or less excavation can greatly prolong the service life of underground pipelines, but non-excavation technology also has the disadvantage of not being able to expand pipeline capacity. [0003] With the improvement of urban storm discharge standards, the return period of rainwater pipeline design in the central urban area has increased from P = 1 year in the last century to P = 3 years or even 5-10 years, and the old drai...

AI Technical Summary

Problems solved by technology

Obviously, the use of large excavation to expand the pipeline is not the optimal solution, whether it is from the perspective of social impact or economic perspective, and the traditional trenchless pipeline repair cannot expand the pipeline

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