CN-121993689-A - Non-excavation repair pipeline and preparation method thereof

CN121993689ACN 121993689 ACN121993689 ACN 121993689ACN-121993689-A

Abstract

The invention belongs to the technical field of pipeline trenchless rehabilitation, and particularly relates to a trenchless rehabilitation pipeline and a preparation method thereof. The trenchless repair pipeline consists of a lining pipe and interface filling bodies distributed on the outer surface of the lining pipe, wherein the interface filling bodies consist of a plurality of sealed cavity bags and filling materials filled in the cavity bags, the cavity bags are made of degradable films, and the filling materials comprise moisture-curing polymer materials. The non-excavation repair pipeline utilizes the characteristic that the moisture-cured polymer is cured/expanded when meeting water after the film is degraded, and the irregular gaps between new and old pipelines are filled in a self-adaptive mode, so that three-dimensional close fitting and structural integrity are realized, and leakage risks are thoroughly eliminated.

Inventors

GAO YUXIN
LIU MING
JIN ZIHAO
ZENG CHAO
YE ZI
YAN SONGLING
ZHANG RUI
HAN WENJIN

Assignees

中建西部建设建材科学研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20251223

Claims (7)

1. The non-excavation repair pipeline is characterized by comprising an inner liner pipe and interface filling bodies distributed on the outer surface of the inner liner pipe, wherein the interface filling bodies comprise a plurality of sealed cavity bags and filling materials filled in the cavity bags; The cavity bag is made of a degradable film, and the filling material comprises a moisture-curing polymer material.
2. The trenchless rehabilitation pipe of claim 1 wherein the degradable film is a polybutylene terephthalate-adipate modified polylactic acid film or a polyhydroxybutyrate modified polylactic acid film.
3. A trenchless rehabilitation pipe according to claim 1 or 2, wherein the moisture curable polymeric material is a polyurethane prepolymer.
4. A trenchless rehabilitation pipe as claimed in claim 1 or claim 2 wherein the hollow cells are elongate and extend along the length of the liner, the outer surface of the liner being in a strip arrangement.
5. A trenchless rehabilitation pipe according to claim 4, wherein the width of each of the hollow bladders is between 5% and 20% of the diameter of the liner pipe.
6. A trenchless rehabilitation pipe according to claim 1 or 2, wherein the filling volume of the filling material is 40% to 80% of the total volume of the cavity inside the cavity capsule.
7. A method of making a trenchless rehabilitation pipe as defined in any one of claims 1 to 6 comprising the steps of: (1) Packaging and molding the filling material into a long-strip-shaped bag body without air inside by adopting a degradable film; (2) And (3) bonding a plurality of strip-shaped bag bodies on the outer surface of the lining pipe by adopting an adhesive film, and sealing, drying and preserving for later use.

Description

Non-excavation repair pipeline and preparation method thereof Technical Field The invention belongs to the technical field of pipeline trenchless rehabilitation, and particularly relates to a trenchless rehabilitation pipeline and a preparation method thereof. Background The urban underground pipe network is a 'life line' for maintaining the operation of modern cities, and the safe operation of the urban underground pipe network is directly related to the stable development of socioeconomic and the guarantee of civilian life. However, as the urban process is accelerated, the ageing problem of the pipe network is increasingly remarkable, the early-built urban pipe network is generally in the "high-age" period, and a large number of pipe networks are in service for more than 20-30 years, so that structural defects such as corrosion, damage, leakage and the like are generally caused. The trenchless repair technology utilizes the original pipeline path to repair and update in a trenchless or trenchless mode, and has the remarkable advantage of little influence on urban environment. The ultraviolet light in situ curing method (UV-CIPP) is one of the most widely used trenchless pipeline repairing technologies at present, and the basic flow is to drag a hose (commonly called as a lining pipe) impregnated with resin into an old pipeline to be repaired, inflate the hose to expand and attach the hose to the inner wall of the old pipeline, and then cure and mold the resin by ultraviolet light irradiation to form a new pipeline with higher structural strength inside the old pipeline. However, this technique has a critical disadvantage in that the resin impregnated hose has a limited deformability during the pneumatic fitting process, and when there is severe corrosion, partial collapse, interface misalignment or other irregular deformation of the old pipe inner wall, the outer surface of the cured new pipe (repair structure layer) is difficult to closely and continuously fit with the rugged old pipe inner wall. The damage of the gaps or the cavities between the new pipeline and the old pipeline is that (1) the structural integrity is reduced, the new pipeline cannot effectively share the load of the old pipeline and influence the overall structural strength of the repaired pipeline, and (2) leakage channels are formed, namely, underground water or in-pipeline fluid can leak through the gaps, so that the ideal repairing effect cannot be achieved. (3) The service life is shortened, sediment is easy to accumulate in gaps or hydraulic flushing is easy to generate, and the stability of the repaired pipeline can be influenced for a long time. Therefore, a trenchless repairing technology capable of effectively and adaptively filling irregular gaps between new and old pipelines is needed, so as to solve the problems of poor integrity, low repairing quality, short service life and the like caused by the fact that the interface between the new and old pipelines is not tightly attached. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide an interface self-adaptive non-excavation repair pipeline and a preparation method thereof, and by arranging a special interface filling body on the outer surface of a repair structure layer, the filling body can be used for repairing the pipeline in a period of time after the repair construction is finished, and responding to the moisture in the environment, and adaptively expanding and filling irregular gaps between the new pipeline and the old pipeline, so that the tight, continuous and integral combination of the new pipeline and the old pipeline is realized, and the repair quality and the service life of the pipeline are obviously improved. Specifically, the invention provides the following technical scheme: The non-excavation repair pipeline consists of an inner liner tube and interface filling bodies distributed on the outer surface of the inner liner tube, wherein the interface filling bodies consist of a plurality of sealed cavity bags and filling materials filled in the cavity bags; The cavity bag is made of a degradable film, and the filling material comprises a moisture-curing polymer material. Preferably, the degradable film is a polybutylene terephthalate-adipate modified polylactic acid film or a polyhydroxybutyrate modified polylactic acid film. The research shows that the hollow cavity bag made of the modified polylactic acid film has the tensile strength of more than 20MPa, can avoid film rupture caused by external force in the construction process to a certain extent, has the mass loss rate of not less than 30 percent after being buried in natural soil environment at 25+/-2 ℃ for 6 months, ensures that the internal moisture-preserving cured polymer material overflows effectively, and is particularly suitable for the invention. Preferably, the moisture-curable polymeric material is a polyurethane prepolymer. The polyurethane prepolymer