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一、概说用灰土作为基礎材料在我国早在千年以前已经开始,根据我院防水组在北京、西安、太原等地的调查。唐朝的基礎一般就是用白灰和黄土分层夯实的,而白灰黄士按一定比例混合后分层灰实的灰士,是在宋朝才得到比较广泛的应用,到了明清则已普遍的应用。解放前,这个方法在华北天津、北京等城市使用较广。解放后在我国东北西北等地区的民用建筑中已大量采用,1958年曾被应用于工业厂房基地以代替砼,(北京某机床厂吊车荷重20吨),证明了使用情况良好。在民用建筑方面,过去灰士限制用于四层
I. It is generally stated that the use of limestone as a basic material has begun in China as early as a thousand years ago, according to the investigation of the waterproof group of our institute in Beijing, Xi’an, and Taiyuan. The foundation of the Tang dynasty was generally layered with white ash and loess, while the gray ash and yellow ash were mixed in a certain proportion and were gray and gray. They were widely used in the Song dynasty and were widely used in the Ming and Qing dynasties. . Before liberation, this method was widely used in cities such as Tianjin and Beijing in North China. After liberation, it was widely used in civilian buildings in the northwestern regions of northeast China. In 1958, it was used as an industrial factory base to replace helium (a load of 20 tons for a machine tool factory in Beijing), which proved that it was in good condition. In the field of civil construction, the use of the forties in the past was limited to four floors.