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河南永夏矿区陈四楼矿，其主、副井井筒采用冻结法施工，经煤科总院北京建井所和两淮煤矿将省公司等单位联合攻关，使井筒安全、快速、优质地通过冻结段，创造了国内冲积层最厚、冻结最深的井筒无断管、无压坏井壁、无事故的先例，多项科技成果获国内第一，填补了冻结凿井的空
Chen Yong House in Yongxia mining area in Henan Province, the main and auxiliary wellbore construction by freezing method, the Coal Division General Hospital Beijing Jian wells and two Huai coal mines will provincial companies and other units jointly tackle the wellbore safe, fast and good through Frozen section, creating the thickest alluvial layer, the deepest wellbore no broken pipe, no crushing borehole wall, no precedent for accidents, a number of scientific and technological achievements by the domestic first, to fill the empty wells for freezing