旋挖钻机在平邑石膏矿坍塌事故大直径救生孔钻进中的应用

Application of Rotary Drilling Rig in Large Diameter Rescue Hole Drilling in the Collapse Accident in Pingyi Gypsum Mine

摘要:

2015年12月25日，山东省平邑县一石膏矿发生坍塌事故，多人被埋井下。由于救援人员通往井下的通道被堵死，利用巷道进行救援很难实施。为避免次生事故，决定采用大口径钻机打孔救援方案。救援过程中，多台钻机相互配合， BG26、BG38型旋挖钻机钻进上部孔段， RB-T90、T200XD型多功能钻机钻进下部孔段。钻达最终深度220 m后，成功将被困人员救出，创造了中国矿山救援史上第一个通过地面打孔救援的案例。主要介绍旋挖钻机在大直径救生孔成孔过程中关键技术点的控制，从钻头选择、护筒埋设、成孔钻进方面对钻孔垂直度进行控制；采用下入护筒、熟练人员精心操作、干成孔工艺等避免钻孔坍塌。

Abstract:

In the collapse accident in Pingyi gypsum mine rescue, the underground channel was blocked. The rescue plan with large diameter drilling rig was determined to avoid the secondary accident. Several drilling rigs were put into use, BG26 and BG38 rotary drilling rigs were used for upper hole drilling segment and RB-T90 and T200XD multi-function drill for lower segment. The trapped persons were rescued while getting to the final depth, which created the first rescue case by drilling hole from the ground in the history of China’s mine rescue. The paper introduces the control on key technologies of rotary drilling rig in rescue hole construction process, such as bit selection, protection tube embedment and verticality control in borehole drilling; borehole collapse was avoided by protection tube lowering, skilled operation and dry-hole drilling.