一、砼喷射机 由于煤矿巷道愈来愈深,所以地压愈来愈大的巷道很难以维护,因此,要求开发新的支护方法。例如,地面建筑物建造二层用木结构就可以了,而再向高层发展就得使用钢筋混凝土和钢骨架乃致于更轻型材料。对井下的支护,浅巷道用木支架就可以了,而从钢支架再进一步使用钢筋锚喷支架的支护方法就更有必要了。 近年土建遂道工程中采用NATM(新奥法—译者)施工方法,在重压下推进围岩获得成果。这种施工方法的重要支护材料是在安装锚杆后喷一层薄的砼,而对软弱的围岩还架设钢支架。为了支护的施工尽量保持围 First, the concrete jet As the coal mine roadway deeper and deeper, so more and more ground pressure is difficult to maintain the roadway, therefore, requires the development of new support methods. For example, a two-story timber structure may be used for the construction of the ground floor, while the use of reinforced concrete and steel frames for further development will result in lighter materials. On the underground support, shallow wood with a wooden bracket on it, and then further use of steel from the steel anchor spray gun support method is even more necessary. In recent years, civil construction tunnel project using NATM (New Austrian law - translator) construction methods, under the pressure to promote the surrounding rock to obtain results. An important supporting material for this kind of construction method is to spray a thin layer of concrete after the installation of anchor bolts and steel supports for weak surrounding rocks. In order to support the construction to keep the fence around