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我公司1983年以来,陆续拆除过杭州重型机械厂铸工车间24m跨及杭州制氧机厂加工车间24m跨、18m跨等屋盖系统,并均有装配式天窗。这些厂房就是在五十年代后期、六十年代初建造的,是预制全装配式钢筋砼结构,屋架是套用苏联三铰拱式和拱型预应力钢砼屋架,屋面采用1.5m×6.0m或3.0m×6.0m的大型屋面板,由于这些构件砼制作质量较差,经过二、三十年的使用,使砼早期碳化,钢筋锈蚀,屋面板砼整块整块的脱落,对车间的安全生产危害很大,所以在技术改造中首先对这些工程的屋盖系统要全部拆除,重新安装钢砼结构或钢屋架砼屋面板等。拆除屋盖系统要比安装屋盖系统困难得
Since 1983, our company has successively dismantled 24-meter-span and 18-meter-span roofing systems in the 24m span of the Hangzhou Heavy Machinery Plant and 24m span in the Hangzhou Oxygen Machinery Plant. All of them have assembly-type sunroofs. These buildings were built in the late 1950s and early 1960s. They were prefabricated, fully assembled, reinforced concrete structures. The truss was constructed of Soviet triple-arched arched and arched prestressed steel truss trusses. The roof was 1.5m by 6.0m or The 3.0m×6.0m large roof panels, due to the poor quality of these components, have been used for two to three decades to cause early carbonization of the concrete, corrosion of the steel reinforcement, and removal of the entire block of the roof slab, and the safety of the workshop. The production of harm is very great, so in the technological transformation, first of all, the roof systems of these projects should be completely dismantled, and steel truss structures or steel trussed roof panels should be reinstalled. It is more difficult to remove the roof system than to install the roof system