高压岔管衬砌混凝土施工期温控防裂研究OACSTPCD

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.