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Friction Test for the Incremental Launching Slippage System of a Prefabricated Immersed Tunnel Segement
1 CCCC Second Harbor Engineering Co., LTd 2 Key Lab of Large-Span Bridge Construction Technology, Ministry of Communication 3 National Engineering Research Center of Highway Bridge
Abstract 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-PTFE, 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.
Abstract：
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-PTFE, 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.
.Friction Test for the Incremental Launching Slippage System of a Prefabricated Immersed Tunnel Segement[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(2): 143-147
2015, Vol. 52 