火灾条件下盾构衬砌管片接缝防水性能研究

发布时间：2018-06-03 12:17

本文选题：隧道火灾 + 盾构衬砌　；参考：《北京交通大学》2014年硕士论文

【摘要】：摘要：伴随我国城镇化日益进程加快,交通建设项目与日俱增。作为城市运行的主要载体,公路、铁路、地铁盾构隧道建设已经成为时代热点。本文以盾构隧道火灾为背景,从盾构衬砌管片接缝的热传导、橡胶密封垫和嵌缝的物理性能和防水性能出发,以橡胶密封垫在高温前后的防水性能和力学性能为主要研究内容。通过对橡胶密封垫防水试验和压缩应力试验的结果进行总结,得出结论。最终提出当隧道火灾发生时,接缝处达到多少温度,橡胶密封垫失效即完全丧失防水性能。并参考国内外盾构隧道火灾条件下橡胶密封垫和嵌缝的受热受压性能,提出提高盾构衬砌管片接缝防水防火性能的合理化建议。本文具体研究内容如下： (1)针对高温加热前后的橡胶密封垫,通过部分物理性能试验和部分化学性能试验,研究不同温度下橡胶密封垫的力学性能的退化。 (2)针对高温加热前后的橡胶密封垫,通过T字型模拟耐水压试验,研究不同温度条件下橡胶密封垫的防水性能的退化。 (3)通过橡胶密封垫的高温试验,设置梯度温度,找到压缩状态下弹性橡胶密封垫完全失去防水性能的温度点。总结试验成果,得到火灾条件下管片接缝防水性能的安全性评定标准。 (4)结合国内外研究状况,提出提高火灾状态下盾构衬砌管片防水防火性能的建议。
[Abstract]:Absrtact: with the acceleration of urbanization in China, traffic construction projects are increasing day by day. As the main carrier of urban operation, highway, railway, subway shield tunnel construction has become a hot spot of the times. Taking shield tunnel fire as the background, this paper starts from the heat conduction of shield lining segment joint, the physical properties and waterproofing performance of rubber seal gasket and joint, and takes the waterproof property and mechanical property of rubber seal pad before and after high temperature as the main research content. The results of waterproof test and compression stress test of rubber gasket are summarized and the conclusion is drawn. Finally, it is proposed that when the tunnel fire occurs, the rubber gasket loses the waterproofing property completely when the joint reaches the temperature. With reference to the thermal compression performance of rubber gasket and joint under the condition of shield tunnel fire at home and abroad, the reasonable suggestions for improving the waterproof and fire resistance of shield lining segment joint are put forward. The contents of this paper are as follows: 1) the degradation of mechanical properties of rubber gaskets at different temperatures was studied by means of some physical and chemical tests for rubber gaskets before and after high temperature heating. (2) in view of rubber gasket before and after high temperature heating, the degradation of waterproof property of rubber seal under different temperature conditions was studied by using T-shaped simulated water pressure test. Through the high temperature test of rubber gasket and setting gradient temperature, the temperature point where elastic rubber gasket loses its waterproofing property completely under compression state is found. The test results are summarized and the safety evaluation standard for the waterproofing performance of pipe joints under fire condition is obtained. 4) according to the research situation at home and abroad, some suggestions are put forward to improve the waterproof and fire resistance of shield lining segment under fire condition.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;U458

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