为了认真落实毛主席“开发矿业”的伟大指示,几年来,我们在中条山有色金属公司铜矿峪铜矿的竖井、主要运输平巷、马头门、变电硐室、岔道口和电耙坑道、硐室工程中,大力试验应用了喷射混凝土和喷射混凝土——砂浆钢筋锚杆联合支护试验。喷射混凝土是利用喷射机将水泥、砂子、石子和少量速凝剂按一定配比拌成千的混合 In order to conscientiously implement Chairman Mao’s “Great Development of Mining,” a great guideline, in the past few years, we at the shaft of the Tongkuangyu Copper Mine of Zhongtiaoshan Nonferrous Metals Company, the main transport lane, Matoumen, substation chamber, Chadukou and electricity Rake tunnels, chamber project, vigorously test the application of shotcrete and shotcrete - mortar reinforced bolt and anchor joint support test. Sprayed concrete is the use of jet cement, sand, gravel and a small amount of quick-setting agent according to a certain mix of mixing