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本文概要地说明用冻结法开凿竖井和设计安装铸铁圆筒支护的技术,并简要地叙述了加拿大采用这种方法完成的一项设计。
This article provides an overview of the technique of freezing a shaft and designing and installing cast iron cylinder supports, and briefly describes a design that has been completed in Canada in this way.