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混凝土喷射机是进行锚喷支护的主要机具,国家建委、煤炭部于1978年10月联合召开的全国光爆锚喷支护施工技术经验交流会指出,要积极研制湿式喷射机,变干式喷射为湿式喷射。1981年5月召开的全国重点煤矿光爆锚喷会议亦强调研制新机具,而降尘的技术途径应走湿喷道路。湿式喷射混凝土是使物料在加水搅拌后送到喷头,再用压风喷向岩面。与干式喷射相比,能更准确控制水灰比,水泥水化充分,喷射混凝土强度高,以及粉尘少、回弹低等优点。据美国赫克拉米采矿公司测定,在喷料配比相同的情况,湿喷混凝土抗压强
Concrete jet is the main equipment for anchor spray support, the State Construction Commission, Ministry of Coal jointly held in October 1978 the national light blast anchor spray support construction technology experience exchange meeting pointed out that we should actively develop wet jet machines, dry-type Spray is wet spray. In May 1981, the national key coal mine explosion blast anchor meeting also emphasized the development of new equipment, and the technical approach to dust reduction should follow the wet-spraying road. Wet shotcrete is to make the material in the mixing water to the nozzle, and then pressure jet rock face. Compared with dry jetting, it can control water-cement ratio more accurately, fully hydrate cement, high strength of shotcrete, less dust and low rebound. According to the United States Heklamici mining company determined that the same proportion of sprayed material, wet shotcrete compressive strength