Excavation-free underground pipe line rehabilitation method

Abstract

The invention relates to an excavation-free repair method for an underground conduit, the repair method comprises the following: (1) a step of manufacturing a double-bag type fiber repair fabricated part; (2) a step of installing and constructing, which is to put the double-bag type fiber repair fabricated part into a conduit to be repaired, to seal and fix the double-bag type fiber repair fabricated part on the inner wall of the conduit near the both ports of the conduit to be repaired to vacuumize the double-bag type fiber repair fabricated part by a vacuum pumping helix tube to make the double-bag type fiber repair fabricated part expand peripherally and adhere to the inner wall of the conduit to be repaired, forming a pressure grease die; (3) a step of repairing pressure grease curing, which can finish the excavation-free repair. The repair method of the invention has no need of the clamps on both sides of the conduit orifice and no large-sized equipment such as RTM resin filling equipment and air implanter during construction,the negative pressure generated by vacuumization of the double-bag method enables the resin to fully immerse the fiber fabricated part which is cured and molded into the composite materials for repairing the conduits. The repairing method has the advantages of simple construction equipment, convenient operation and good adaptability and so on.

Description

technical field [0001] The invention relates to an underground pipeline repair technology, in particular to a method for repairing underground pipelines without excavation by using a double-bag fiber repair prefabricated part vacuum-assisted fat injection composite material process. The main classification number of the international patent is intended to be Int.C1.F16L 55 / 162 (2006.01). Background technique [0002] Underground pipelines, such as water supply pipelines, gas pipelines and sewers, have brought great convenience to people's production and life. However, due to improper design, negligent management and aging of pipeline materials (especially steel pipelines), strength reduction, corrosion perforation, rupture and damage often occur, resulting in unsafe operation of pipelines and leakage accidents. Trenchless underground pipeline repair technology is a new technology for underground pipeline repair, which has many advantages. The existing trenchless undergroun...

AI Technical Summary

Problems solved by technology

The disadvantages of the traditional lining method are: (1) the flow section suffers a large loss, but the impact is relatively small when the pipe diameter is large; (2) the annular gap requires grouting; (3) a guide groove (coiled tubing) needs to be excavated method); (4) The connection point of the branch pipe needs to be excavated; (5) It is generally only suitable for pipes with circular cross-sections

The disadvantages of the improved lining method are: (1) the connection of the branch pipes needs to be excavated; (2) the structural damage of the old pipes will cause construction difficulties; (3) it is generally only suitable for repairing straight circular pipes

The soft lining method has no loss in the flow section of the pipeline, and the flow performance is greatly improved, but its disadvantages are: (1) special construction equipment is required, and the technical requirements for workers and construction are high; (2) the project scale is small and the cost is relatively high. High; (3) The resin curing time is longer (generally more than 5h); (4) Each project requires different soft liners

The disadvantages of this method are: it is necessary to design special fixtures on both sides of the pipe opening during construction; RTM resin injection machines and air injection machines and other equipment must be used; the construction technology is relatively complicated, the design cost is high, and the corresponding repair cost is high, which is not conducive to Promotion and implementation

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