| In recent years, buried pipe leaks caused by corrosion perforation was a rising trend yearby year, which caused great harm to the safe operation of buried steelpipelines.Therefore, the steel pipe leak repairs and partial failure of cathodic protectionsystem should be supplemented imminently.But, in accordance with the relevant provisionsof City Hall,3-5years no excavation.One is The approval of complex. Two isPay expensive.Three is traffic disruption and effect of environment. Compared with thetraditional method of excavation operations, which is harmful to the environmentand traffic problems. Keyhole pavement Coring and reinstatement system is one of theeffective means of underground gas pipeline repair.Firstly, the paper introduced the main equipment, the composition of thesystem,describes the working process of the system. The system integrated the road cuttingtechnology, vacuum mining technology and pavement restorationtechniques,efficient solution to the pipeline anticorrosion layer s repairp. The paperresearched the development of the Beijing road management regulations and the technologydevelopment status at home and abroad.On the basis,the paper combined with the actualsituation of Beijing gas, feasibility analysised of the technology application, summarizes theapplication range of this technique and the problems.Secondly, the paper carried on the comparative analysis of Beijing common repairmaterials and construction process, combined with the actual environment of undergroundand damage of anticorrosion layer condition,then selected the best repair materials for thekeyhole construction.Finally, the paper used the blasting pit to simulate the keyhole space, selected the3PE coating, asphalt coating, fusion bonded epoxy (FBE) coating and asphalt corrosion beltto be the experimental object.Then,used the electric sparkand and comparison experiment toevaluat reliability of Coating repair in keyhole. |
