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四老沟矿南羊路进风井，从井筒２０２．５ｍ水平延深至３４９．３ｍ，延深井筒长１７６．８ｍ。先用反井钻机在延深井筒中心钻１．２ｍ钻孔，然后自上而下一次全断面扩刷、支护。中心钻孔解决了延深施工中的装矸、排水、通风三大工序。扩刷时只用一层天轮盘、一层封口盘和井内三层吊盘。用４台回柱纹车完成设备和管线的吊挂。该施工方案设备少、工序简单、速度快，延深井筒只用７４天完成，平均月成井７０．４ｍ。延深施工期间上段井筒仍正常使用。
Si Laogou Mine Nan Yang Road into the air shaft, extending from 202.5m horizontal well to 349.3m, extending the depth of 176.8m long shaft. The first use of anti-drilling rig in the deep wellbore center drilling 1.2m drilling, and then from top to bottom, a full face expansion brush, support. Drilling center to solve the deepening of the installation of gangue, drainage, ventilation, three major processes. When expanding brush only a layer of day roulette, a layer of sealing plate and well within the three-tier hanging plate. Use 4 pillars to complete equipment and pipeline hanging. The construction program less equipment, process is simple, fast, deep well is completed only 74 days, the average monthly well 70.4m. During the construction period, the upper wellbore is still in normal use.