中文摘要：

根据PCCP（预应力钢筒混凝土管）插口端内壁混凝土环裂产生机理,从管道结构设计出发,提出了高工压、双层缠丝管道PCCP插口内壁混凝土的抗裂措施。该措施同时采用在插口异形钢环外侧预留变形缝、插口管芯内衬钢环以及插口内壁使用钢纤维混凝土等三种手段,通过提高插口抗弯能力、降低缠丝附加弯矩而实现插口内壁抗裂。建立了高工压、双层缠丝PCCP的三维非线性有限元模型,模拟了管道生产中的典型受力情况,分析了管道的应力和变形规律,并与无抗裂措施的管道进行了对比。结果表明,所提出的PCCP插口内壁混凝土的抗裂措施可以大大改善高工压、双层缠丝PCCP插口内壁混凝土的环裂问题。

英文摘要：

According to the circumferential cracking mechanisms of the inner wall of spigot in the prestressed concrete cylinder pipe （PCCP）, the anti-crack measures are put forward for the structural design of PCCP. For the pipes with the higher internal pressure and double wire wrapped structure, the deformation joint is adopted in the outside of spigot shaped steel rings, and steel ring is lined in the inner wall of the core concrete, and the steel fiber reinforced concrete is used in the spigot simultaneously. To investigate the effectiveness of the anti-cracking measures, the three-dimensional nonlinear finite element models are established respectively to analyze the strain/stress and deformation of the pipe. In comparison with the existing pipes, the residue flexural strength of spigot is improved by using the anti-cracking measures in the PCCP.