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对目前国内外用于水平定向钻穿越(Horizontal Directional Drilling,HDD)的单层熔结环氧粉末、双层熔结环氧粉末、熔结环氧粉末+聚氨酯面层、环氧涂层+环氧聚合混凝土面层、多层粉末涂层、聚乙烯防腐层的应用现状进行了分析。指出国外的定向钻穿越管道多数采用双层环氧,而国内定向钻穿越管道基本采用3LPE,结构比较单一。随着管道建设项目的增多和路由的限制,越来越多的管道将采用HDD技术进行施工,多层粉末涂层、熔结环氧粉末+聚氨酯面层、环氧涂层+环氧聚合混凝土面层将成为未来涂层的发展趋势,选择合理的涂层可在减少涂层损伤的同时保持较高的经济性。(表2,图8,参8)
For the current domestic and international Horizontal Directional Drilling (HDD) single-layer fused epoxy powder, double-layer fused epoxy powder, fused epoxy powder + polyurethane surface layer, epoxy coating + epoxy Polymerized concrete surface layer, multi-layer powder coating, polyethylene coating application status were analyzed. It is pointed out that the foreign directional drilling often adopts double-layer epoxy, while the domestic directional drilling through the pipeline basically adopts 3LPE, the structure is relatively simple. With the increase of pipeline construction projects and routing restrictions, more and more pipelines will be constructed with HDD technology. Multi-layer powder coating, fused epoxy powder + polyurethane surface coating, epoxy coating + epoxy polymer concrete The surface layer will be the future trend of the coating, the choice of a reasonable coating can reduce damage to the coating while maintaining high economic. (Table 2, Figure 8, reference 8)