CFD analysis of reverse water retaining lifting force of two-way plane steel gate and load reduction countermeasures

To solve the problems of excessive lifting force and insufficient lifting force of the conventional hoist when the vertical lifting two-way steel gate is used for reverse water retaining,taking the control gate of a sluice station in Jiangsu Province as the research object,the force analysis of the gate during the opening process of reverse water retaining was carried out,and the CFD method was used to calculate the flow field and the forces of water flow on the gate at different opening height. The gate lifting forces were calculated,and were verified by the actual measurement results. The influencing factors of the gate lifting force and the reasons for its increase were analyzed,and the method of increasing the area of the drainage holes on the gate bottom beam to reduce the door lifting force was proposed. ANSYS Workbench was used to check the strength of the gate beam after the drainage hole area was increased. The results show that during the door opening process,the downward flow impacts the upper surface of the main beam at the bottom of the gate,resulting in the pressure difference between the upper and lower surfaces,which is the main reason for the increase of the gate lifting force. The gate lifting force decreases approximately linearly with the increase of the area of the drainage holes,at the same time,the maximum stress of the main beam decreases and the strength can be guaranteed because of the decrease of the horizontal force of the water flow on the gate. When the area of the drainage holes increases to 8 times the original area,the gate lifting force decreases by 7.6%-11.9%,and the effect is significant. The results of this article are of great significance for improving the design of the two-way water sluice gate,reducing the gate lifting force,and ensuring the safety of the lifting gate.