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宣东二矿主井箕斗装载硐室掘进体积１５０４ｍ３，采用井筒超前掘进、上室和下室分层掘进、分两段与井筒同时套壁的施工方法，取得了优质、快速、安全施工的良好效果
The drilling volume of main shaft skip loading cavern of Xuan Dong No.2 Mine is 1504m3. The wellbore is advanced with advanced boring, the upper chamber and the lower chamber are stratified for excavation, and the construction method of simultaneous walling in two sections and the wellbore is achieved. The construction of high quality, rapid and safe construction Good effect