SHI Guo-peng,MA Bao-song,YANG Chao,et al.Structural Performance of Reinforced Concrete Pipe Repaired by Cement Mortar Spraying Method[J].China Water & Wastewater,2020,36(20):32-38.
水泥砂浆喷涂法修复钢筋混凝土管道结构性能
- Title:
- Structural Performance of Reinforced Concrete Pipe Repaired by Cement Mortar Spraying Method
- Keywords:
- sunken pipe; trenchless rehabilitation; three-edge bearing test; finite element simulation
- 摘要:
- 水泥砂浆喷涂法非开挖修复技术能够提高管道力学性能，目前在国内应用广泛。为深入探究砂浆内衬修复技术对管道的修复效果和机理，对一根直径1 m、垂直变形为14.7％、砂浆内衬层厚度为50 mm的修复钢筋混凝土管道进行裂纹三边荷载试验，得到了修复后管道裂缝萌生和承载能力变化规律。根据试验结果建立有限元模型，分析了砂浆喷涂厚度、原管变形程度、内衬层加筋对修复效果的影响。研究结果表明，内衬层厚度增加可以提高修复结构的承载力，并在原管破损程度较小时修复效果较好；内衬层加筋可提升修复管道的力学性能，配筋率增加可提高修复承载能力，钢筋加固位置越靠近内衬管内表面，修复结构的抗裂强度就越高，极限承载力越低。
- Abstract:
- The trenchless rehabilitation technology of cement mortar spraying can improve the mechanical properties of pipelines, and currently is widely used in China. In order to further explore the effect and mechanism of mortar lining repair technology on the pipeline, a three-edge bearing test was carried out on a repaired concrete pipeline of diameter 1 m, vertical deformation 14.7%, and lining thickness 50 mm.The law of pipeline crack initiation and bearing capacity variation after repair was obtained. Based on the test results, a finite element model was established to analyze the influence of mortar spraying thickness, original pipe deformation degree, and reinforced inner lining on the repair effect. The research results show that the increase of inner lining thickness can improve the bearing capacity of the repaired structure, and the repair effect is better when the original pipe is less damaged; the reinforced inner lining can improve the mechanical properties of the repaired pipeline and the increase of reinforcement ratio can increase the repaired load. The closer the reinforced location is to the inner surface of the lining pipe, the higher the crack resistance of the structure and the lower the ultimate bearing capacity of the structure.
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