论文部分内容阅读
我国早期建设的压力管道已经逐步到达设计使用年限,大量管道已经老化,亟待更新修复。目前非开挖内衬修复技术已经开始运用于给水和燃气管道修复工程中,纤维增强复合软管内衬是在传统折叠内衬法基础上发展的新型修复方法,目前国内对于这种复合软管内衬的研究较少。鉴于此,通过开展抗拉试验、抗弯试验及爆管试验,对这种纤维增强型内衬的力学性能进行了深入研究。研究结果表明:复合软管主要受力层为中间的织物增强层,并且受拉时具有明显的各向异性,45°方向、圆周方向和纵向方向5个试件的平均拉伸强度分别为4MPa、25MPa、32MPa,其纵向方向的抗拉强度明显大于圆周方向;复合软管内衬5个试件的平均弯曲模量是32MPa、弯曲强度为4MPa;爆破试验中,软管爆破方向均为纬向爆破,试验结果与拉伸试验、弯曲试验结果一致,3个试件的平均爆破压力是3.54MPa,满足管道运行压力的要求。
China’s early construction of the pressure pipeline has gradually reached the design life, a large number of pipelines have been aging, urgently need to update the repair. At present, non-excavation lining repair technology has begun to be used in water supply and gas pipeline repair projects. Fiber-reinforced composite hose lining is a new type of repair method developed on the basis of traditional folding lining method. Currently, this type of composite hose is used in China. There is less research on linings. In view of this, the mechanical properties of this fiber-reinforced lining were studied in depth by carrying out tensile tests, flexural tests and burst tests. The results show that the main stress layer of the composite hose is the middle fabric reinforcement layer, and has obvious anisotropy when tensioned. The average tensile strength of the five specimens in the 45° direction, circumferential direction and longitudinal direction is 4 MPa, respectively. , 25MPa, 32MPa, the tensile strength in the longitudinal direction is significantly greater than the circumferential direction; the average bending modulus of the composite hose lining 5 specimens is 32MPa, the bending strength of 4MPa; blasting direction, the hose blasting direction are weft To blasting, the test results are consistent with the results of tensile test and bending test. The average burst pressure of the three specimens is 3.54 MPa, which meets the pressure requirements of the pipeline.