高密度聚乙烯板内衬钢筋混凝土管接口构造研究

高密度聚乙烯(HDPE)内衬通过锚固键机械式嵌入钢筋混凝土管管体内,以增强钢筋混凝土管防腐蚀性能。为获得HDPE内衬在管节接口处不同处理形式下的特性,开展了内衬HDPE钢筋混凝土管接口处抗外水压试验研究。试验结果表明,接口处HDPE内衬焊接处理后,在较大的外水压力条件下,现场焊接质量达不到原材料的水密性并同时产生鼓胀变形的不利情况。根据试验结果,分析了管节接口处内衬不焊接,完全焊接,部分焊接三种构造形式,并提出了内衬构造形式的选用建议。

Study on Construction of Reinforced Concrete Pipe Joint with High-density Polyethylene Plate Lining

The high-density polyethylene (HDPE) lining is mechanically embedded into the inner wall of the reinforced concrete pipe through the anchor key to enhance the corrosion resistance of the reinforced concrete pipe. In order to obtain the characteristics of HDPE lining under the different treatment conditions at pipe joints, an experimental study on the resistance to external water pressure at the lined HDPE reinforced concrete pipe joint is carried out. The experimental results show that after the HDPE lining at the joint is welded, under a large external water pressure, the field welding quality cannot meet the water tightness of raw materials and the unfavorable situation of bulging and deformation occurs. According to the test results, three structural types of the unwelded, completely welded and partially welded linings at the joints of pipe joints are analyzed, and the suggestions for the selection of structural types of linings are put forward.