Method for repairing and constructing trenchless large caliber water feeding penstock

Abstract

The invention provides a construction method for repairing a pressure water supply pipe with big diameter without excavating. The method comprises such procedures as clearing scale in the old pipe, laying an inner lining pipe, connecting, inspecting and pressure testing the pipe, etc. The method is characterized in that, the laying of the inner lining pipe is to pass a glass steel & sand pipe and a steel pipe in diameter slightly smaller than that of the former mother pipe into the former mother pipe, a glass steel & sand pipe is used at pipe section without branch, and a steel pipe is used at pipe section needing branch; between the inner lining pipe sections, a joint of sealing and connecting function is provided. The construction method in the invention is relatively simple, the process is mature, economic and practical, and a repaired pipe has the advantages of the small resistance in delivering liquid, the good resistance to corrosion, the long service life and the no water pollution.

Description

Technical field [0001] The invention relates to a non-excavation repair method for a water supply pressure pipeline, in particular to a construction method for laying a "pipe-in-pipe" in a large-diameter water supply pressure pipeline to repair a damaged pipeline. Background technique [0002] Due to the impact of ground vehicle vibration, poor pipeline foundation and corrosion, underground pipelines will have cracks, breakages, pipe joint misalignment and pipe corrosion, so timely repairs are needed. [0003] The common slotted pipeline repair construction method needs to "open the intestines" to the road. This construction method not only has a long construction period and high cost, but also has a great impact on traffic, and generates a large amount of waste, which is harmful to the living environment , The repair construction of large-caliber water supply pressure pipes has a particularly serious impact on roads, traffic and the environment. [0004] The trenchless pipeline ...

AI Technical Summary

Problems solved by technology

However, there are still some shortcomings in the existing trenchless pipeline repair methods, such as the patent No. ZL200410054201.6 "pipeline non-excavation reverse reverse lining repair technology", its obvious shortcomings such as: impregnation with thermosetting materials Large-diameter hoses are prone to hardening during construction, which often affects construction quality; a large amount of hot water is required during construction, so the loss of hot water is large; the process is complicated and costly; branch pipes are inconvenient to connect and have poor reliability