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我们工程处施工的蒋庄矿风井,直径5.5m,深290m。表土段用冻结法施工,基岩采用地面预注浆,施工时井筒涌水一般在6～10m~3/h。当掘到垂深250m时,水泵扬程不够。我们按当时条件采用“水泵压风”排水法,提高了排水扬程,克服了缺高扬程水泵的困难,现将具体做法介绍如下。 一、概述 蒋庄矿风井井筒施工排水设备选用NBD-50/250吊泵,功率75kW。该泵具有半轴流式叶轮,叶轮间隙根据排水量、排水深度、水质的浑浊程度予以调整。风井掘砌
The Jiangzhuang mine shaft constructed by our agency has a diameter of 5.5m and a depth of 290m. Topsoil construction by freezing method, bedrock ground pre-grouting, construction of the wellbore gushing water is generally 6 ~ 10m ~ 3 / h. When digging down the depth of 250m, the pump head is not enough. We use the conditions of the current “water pressure pump” drainage method to improve the drainage head, to overcome the difficulties of lack of head pump, the specific practices are as follows. First, an overview of Jiangzhuang mine shaft construction drainage equipment selection NBD-50/250 hanging pump, power 75kW. The pump has a semi-axial flow impeller, impeller clearance according to the displacement, drainage depth, water quality to adjust the degree of turbidity. Wind wells digging