沉管隧道预制管节顶推滑移系统摩擦试验研究

Friction Test for the Incremental Launching Slippage System of a Prefabricated Immersed Tunnel Segement

为了针对某大型沉管隧道预制管节的顶推滑移系统选择合适的摩擦面材料,文章对该顶推滑移系统的四组拟采用摩擦面材料(不锈钢板-PTFE、不锈钢板-NGE、普通钢板-PTFE、普通钢板-NGE)进行了静、动态摩擦系数测试。利用20 000 k N压剪试验机、采用双剪法进行了模拟测试试验。试验结果表明:(1)四组被测试摩擦面的摩擦系数中,不锈钢板与PTFE板的最小,普通钢板与PTFE板的最大;(2)锂基润滑油和水对减小不锈钢板与PTFE板之间的静、动摩擦系数效果都十分明显,但锂基润滑油对摩擦系数的减小效果会随着油层被挤压变薄而逐渐减弱。该试验结果为该顶推滑移系统的摩擦面材料选择以及摩擦面润滑处理措施提供了重要参考依据。

To select a suitable material for the friction surface of an incremental launching slippage system of a prefabricated segment of a immersed tunnel, the static and dynamic friction coefficients of four material groups, i.e., stainless steel plate-FFFE, stainless steel plate-NGE, ordinary steel plate-PTFE and ordinary steel plate-NGE, were tested. A 20 000 kN load-shearing test machine was used for the test utilizing the double-shear method. The test results indicate that： the friction coefficient of the combined stainless steel plate and PTFE plate is the smallest, and that of the combined ordinary steel plate and PTFE plate is the largest; and lithium-based lubricant and water have visible effects on reducing the static and dynamic friction between the stainless steel plate and PTFE plate, while the effect of lithium-based lubricant on friction reduction declines with the attenuation of the lubricant layer due to squeezing. The test results provide a significant reference for selecting material for the friction surface of incremental launching slippage systems, as well as for disposal measures for lubrication.