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随着天井钻进技术的不断发展,国外地下矿山广泛用1米以上直径的钻孔作天井,供通风、行人、排水和敷设管线等用,对于井壁需要维护的这类钻孔井,通常根据用途和地层条件的不同,分别采用喷射混凝土加固,以及环形钢圈或金属套筒支护。经验表明,当井径大于2.5米时,这几种支护的费用都较高,而且施工工艺复杂,工期也长。针对这一情况,西德于近几年相继研制了水泥砂浆甩浆机和胶体水泥甩浆机,并在实际应用中取得了良好的效果。现简介于下。
With the continuous development of drilling technology in boreholes, underground mines in foreign countries have widely used drill holes with a diameter of more than one meter for the ventilation, pedestrians, drainage, and laying of pipelines. Such boreholes need to be maintained for borehole walls, usually According to different uses and conditions of the formation, shotcrete reinforcement is adopted, and ring-shaped steel rings or metal sleeves are used for support. Experience shows that when the well diameter is more than 2.5 meters, the cost of these types of support is high, and the construction process is complicated and the construction period is also long. In response to this situation, West Germany has successively developed cement mortar slub machines and colloid cement sloshing machines in recent years, and has achieved good results in practical applications. The introduction is now under.