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采用顶进方法修建混凝土管子、混凝土箱涵,已有一定的时间。但在穿越较厚的覆盖层或长距离的顶进时,所需的顶力很大,往往会将管子、箱涵顶碎或者顶上复土随着移动,从而给施工带来不少的困难,有时甚至造成工程的中断。如何减少顶力,防止土体移动,成为顶进施工的关键问题。为此,北京市第四市政工程公司和北京市市政设计院在北京复兴门北西二环路工地,用触变泥浆作润滑剂进行顶管试验。试验段长60余米,管内径1050毫米,复土厚6米左右,这段土
It has been a long time since the concrete pipe and concrete box culvert have been built using the jacking method. However, when passing through a thicker cover or long-distance jacking, the required great jacking force often causes the pipes, the culverts to be crushed or the jacked-up soil to move along with them, thereby bringing about a lot of Difficulty, and sometimes even cause the project to interrupt. How to reduce the jacking force and prevent the soil from moving has become the key issue for jacking construction. To this end, the Fourth Municipal Engineering Company in Beijing and Beijing Municipal Design Institute in Beijing Fuxingmen North West Second Ring Road site, with thixotropic mud as a lubricant pipe jacking test. Test section length of 60 meters, the tube diameter of 1050 mm, the return of soil thickness of 6 meters, this section of soil