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 20):32-38.
Structural Performance of Reinforced Concrete Pipe Repaired by Cement Mortar Spraying Method
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
20 20
Page:
32-38
Column:
Date of publication:
2020-10-17
- Keywords:
- sunken pipe; trenchless rehabilitation; three-edge bearing test; finite element simulation
- 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.
Last Update:
2020-10-17