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一、基本情况北京市发展商品混凝土起步于1966年。当时的基建工程兵在地铁施工中曾采用集中搅拌形式。这种形式提供的混凝土都是为某工程和本系统服务的,所以还谈不上是商品混凝土。1977年,引进了东德一套年产5万m~3的搅拌站,建在二环路西南角的象来街。建站初期这座属市二建系统的搅拌站,本单位只用了30％,70％供外单位零星用户,主要原因就是价格高于现场搅拌。但据市二建搅拌站分
First, the basic situation Beijing’s development of commercial concrete started in 1966. At that time, infrastructure engineers used centralized agitation in the construction of subways. This form of concrete provides services for a certain project and the system, so it is still not a commodity concrete. In 1977, a mixing plant with an annual output of 50,000 m 3 was built in East Germany, and it was built in Elephant Street in the southwest corner of the Second Ring Road. At the beginning of the establishment of the station, this is a mixing plant of the city’s second construction system. This unit only used 30%, 70% for the sporadic users of the external units, mainly because the price was higher than on-site mixing. But according to the city’s second construction mixing station