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我矿在主、付井施工中曾用普通沉井法过流沙层,但沉速缓慢,常出现井底涌沙、地面塌陷,以及沉井刃脚到达基岩时封水很困难等问题。在年前开始的风井施工中,我们根据井筒钻孔资料,参照兄弟单位的经验,采用了河卵石护壁、自重沉井的施工方法,历时69天,较顺利地穿过了总厚13.23米的第四纪冲积层,其中包括涌水量达360米~3/时的沙层计6.97米。沉井分两节施工,第一节高8米,重180吨;第二节高6.8米,重150吨。沉井
I mine in the main, pay well construction has used common sinking method over-flow sand, but the slow speed, often appear bottom-hole sand, ground subsidence, as well as the sinkhole edge of bedrock sealing water when it is difficult and so on. In the construction of wind tunnel started a year ago, we used the construction method of river pebble protection wall and self-sinking caisson according to the borehole drilling data and with reference to the experience of our brother units. It lasted for 69 days and smoothed through the total thickness of 13.23 meters Quaternary alluvium, including the influx of 360 meters to 3 / hour when the sand meter 6.97 meters. Caisson construction in two sections, the first section of 8 meters high, weighing 180 tons; Section II 6.8 meters high, weighing 150 tons. Sunwell