水力发电2024，Vol.50Issue(1)：33-36,97,5.
高压岔管衬砌混凝土施工期温控防裂研究
Research on Temperature Control and Cracking Prevention during the Construction Period of Lining Concrete of High-pressure Bifurcated Pipe
摘要
Abstract
The high-pressure bifurcated pipe is subject to the scour of high pressure and high speed water flow.In order to meet the structural and working characteristics the pumping concrete is often used to make use of its advantage of high strength but because of its high temperature rise and large elastic modulus and generally early strength concrete this concrete is easy to produce temperature cracks.In order to solve this problem the high-pressure bifurcated pipe of Yangjiang Pumped-storage Power Station is taken as the example the temperature stress of high-pressure bifurcated pipe during the construction period is studied combined with the characteristics of structure and material and with the help of three-dimensional finite element method and the temperature control and cracking prevention measures are selected.The calculation results show that the design length of bifurcated pipe joint has a significant effect on cracking prevention and at the same time reducing the pouring temperature and adopting internal water cooling can achieve better effect of temperature control and cracking prevention.Under the condition of water cooling measures if the pouring temperature of high-pressure bifurcated pipe concrete is controlled within 26℃the minimum safety factor can be above 1.50 which can be used as the pouring construction scheme of engineering site.关键词
高压岔管/衬砌混凝土/施工期/防裂/分缝长度/浇筑温度/仿真计算Key words
high-pressure bifurcated pipe/lining concrete/construction period/cracking prevention/joint length/pouring temperature/simulation calculation分类
建筑与水利引用本文复制引用
焦石磊,王振红,汪娟,金鑫鑫,张步,张凯恒..高压岔管衬砌混凝土施工期温控防裂研究[J].水力发电,2024,50(1):33-36,97,5.基金项目
国家重点研发计划项目(2021YFC3090102,2021YFC-3090104) （2021YFC3090102,2021YFC-3090104）
国家自然科学基金资助项目(52192672) （52192672）
流域水循环模拟与调控国家重点实验室自主研究项目(SKL2022ZD05) （SKL2022ZD05）
