水泥砂漿噴涂法修復(fù)鋼筋混凝土管道結(jié)構(gòu)性能
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.
水泥砂漿噴涂法修復(fù)鋼筋混凝土管道結(jié)構(gòu)性能
- Title:
- Structural Performance of Reinforced Concrete Pipe Repaired by Cement Mortar Spraying Method
- 關(guān)鍵詞:
- 地下管道; 非開挖修復(fù); 三邊荷載試驗(yàn); 有限元模擬
- 摘要:
- 水泥砂漿噴涂法非開挖修復(fù)技術(shù)能夠提高管道力學(xué)性能，目前在國內(nèi)應(yīng)用廣泛。為深入探究砂漿內(nèi)襯修復(fù)技術(shù)對(duì)管道的修復(fù)效果和機(jī)理，對(duì)一根直徑1 m、垂直變形為14.7％、砂漿內(nèi)襯層厚度為50 mm的修復(fù)鋼筋混凝土管道進(jìn)行裂紋三邊荷載試驗(yàn)，得到了修復(fù)后管道裂縫萌生和承載能力變化規(guī)律。根據(jù)試驗(yàn)結(jié)果建立有限元模型，分析了砂漿噴涂厚度、原管變形程度、內(nèi)襯層加筋對(duì)修復(fù)效果的影響。研究結(jié)果表明，內(nèi)襯層厚度增加可以提高修復(fù)結(jié)構(gòu)的承載力，并在原管破損程度較小時(shí)修復(fù)效果較好；內(nèi)襯層加筋可提升修復(fù)管道的力學(xué)性能，配筋率增加可提高修復(fù)承載能力，鋼筋加固位置越靠近內(nèi)襯管內(nèi)表面，修復(fù)結(jié)構(gòu)的抗裂強(qiáng)度就越高，極限承載力越低。
- 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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