In order to consolidate and improve the underground infrastructure, the county smart drainage pipe network construction headquarters is currently deploying to carry out the repair work of the pipe network according to the results of early detection and dredging. Recently, when the county Comprehensive Law Enforcement Bureau (Urban Management Bureau) and Guoyuan Drainage Company carried out underground pipe network restoration operations on Puyuan Avenue and other sections, trenchless restoration technology was adopted on a large scale for the first time. "zero excavation" restoration was realized. "This is the first time in the large-scale repair process of the urban underground drainage network that the road is not 'gutted', but a 'non-invasive operation'." County Integrated Law Enforcement Bureau (urban Administration) public utilities section staff introduction.
It is understood that the trenchless repair simultaneously adopts two technical means of local lining curing repair and overall lining repair, achieving a true "zero excavation". Specifically, the local repair adopts the local forming technology of felt tube and air bag. Through the CCTV pipeline robot to find the way, the felt tube coated with resin is accurately placed at the point to be repaired, and the air bag is used to make it close to the pipe wall. The resin can be solidified at normal temperature for about 1 hour. It can increase the strength of the pipe to achieve the purpose of repair, and can provide certain structural strength.
The overall repair adopts the currently more advanced UV curing repair technology. During the construction, the hose equipped with UV curing resin is inserted into the original pipe, compressed air is used to expand the resin hose and make it fully close to the old pipe, and then the hose containing UV curing resin is irradiated by special wavelength ultraviolet for 30-50 minutes to curing the hose inside the pipe. Eventually, forming a reinforced fiberglass plastic pipe without seams. The repaired new pipeline can reach or exceed the design performance of the original pipeline, and has the advantages of short construction time, high construction flexibility, durable and practical lining pipe.
"The use of trenchless repair method can repair the entire pipeline, but also to repair the leakage of the local interface.It not only can reduce the amount of engineering and construction risk caused by excavation, but also more accurately repair.This repair method can be adjusted and controlled at any time. It has advantages such as small construction area, less impact on road traffic, short construction period, simplified construction process and other advantages that traditional excavation repair cannot compare with. At the same time, the service life of the lining pipe is extended and the quality is more reliable." Guoyuan drainage company staff introduction.
At present, according to the special research report of CCTV pipeline structural inspection and pipe network leakage, the construction personnel are using trenchless repair technology to carry out "point-to-point" accurately repair of minor damage, rupture, deformation and other conditions of the drainage pipe network, and strive to complete the trenchless repair work of the drainage pipe network in the main urban area by the end of August.
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