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某水库发电输水洞混凝土衬砌工程的发电洞为圆形有压隧洞,设计要求首先开挖石方至直径3800mm,然后衬砌40cm厚钢筋混凝土达直径3000mm,衬砌段长127.2m。其特
The power generation hole of concrete lining of a hydropower tunnel in a reservoir is a circular pressure tunnel. The design requires that the stone be excavated to a diameter of 3800mm first, then the 40cm thick reinforced concrete should be lined with a diameter of 3000mm and the length of the lining should be 127.2m. Its special