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凿井井架主要服务于矿山立井井筒掘砌施工工程,属于矿井建设单位的大型专用施工设备。井架承载量、跨度、高度都比较大,该井架安装对施工现场及起吊作业条件要求较高。1存在问题
Drilling derrick main service in mine shaft drilling construction, mine belonging to the construction unit of large-scale special construction equipment. Derrick carrying capacity, span, height are relatively large, the derrick installation on the construction site and lifting the operating conditions require a higher. 1 there is a problem