压力管道下弯段外包钢筋混凝土井壁厚度优化  

Thickness optimization of outer clad reinforced concrete shaft walls in downward bending sections of pressure pipelines

作　　者：吴卫东 Wu Weidong(Xinjiang Corps Hydraulic Hydroelectric Engineering Group Co.,Ltd.,Urumqi 830000,China)

机构地区：[1]新疆兵团水利水电工程集团有限公司,新疆乌鲁木齐830000

出　　处：《山西建筑》2022年第19期178-180,184,共4页Shanxi Architecture

摘　　要：为优化压力管道下弯段外包钢筋混凝土井壁厚度,避免出现温度裂缝等问题,利用数值模拟方法分析了地应力平衡→外包C30钢筋混凝土→700 mm厚C25充填混凝土+壁厚44 mm的钢衬→由内向外3.5 MPa水压力四个阶段下弯段外包钢筋混凝土井壁应力场演化规律。结果表明:外包C30钢筋混凝土初次支护主要作用为承担地应力和竖井压力。充填混凝土主要作用为连接钢管和外包钢筋混凝土;考虑到未来可能存在由于经济关闸产生的“水锤”效应,建议外包C30钢筋混凝土最优厚度为2 m,能够满足结构的稳定性。In order to optimize the thickness of the outer clad reinforced concrete well wall in the downward bending section of the pressure pipeline, in light of the surface temperature cracks and other problems, by using numerical simulation method, the paper analyzes the evolution of the stress field of outer clad reinforced concrete shaft wall s in downward bending sections of pressure pipelines at four stages of field stress balance→outer clad C30 steel reinforced concrete→C25 filled concrete with the thickness of 700 mm→steel lining with 44 mm wall thickness→3.5 MPa water pressure from inside to outside.The results show that the main role of the initial support of outer clad C30 reinforced concrete is to bear the ground stress and shaft pressure. The main function of the filled concrete is to connect the steel pipe and the outer reinforced concrete. Considering the possible “water hammer” effect due to the economic closing of the gate in the future, the optimal thickness of the outer C30 reinforced concrete is suggested to be 2 m, which can meet the stability of the structure.

关 键 词：压力管道 混凝土 数值模拟 井壁 

分 类 号：TU375[建筑科学—结构工程]