钢纤维喷射混凝土支护据英国《隧道与隧道工程》１９９２年第９期报道香港城门公路隧道中有７６０ｍ采用了湿拌钢纤维增强喷射混凝土支护（包括原设计采用大型钢拱结构支护的风化花岗岩１３０ｍ的隧道）。施工中使用油压操纵的Ｒｏｂｏｔ７５型喷射混凝土机械臂，臂上装有自动摆动的喷嘴。喷射混凝土的配比为：水泥４５０ｋｇ，填料１６４０ｋｇ，水２００ｋｇ，水泥重量１０％的速凝剂，比利时生产的ＤｒａｍｉｘＺＰ３０／５０型钩状钢纤维，配率５０ｋｇ／ｍ￣３。对原设计１００ｍｍ厚的金属网喷射混凝土改用６５ｍｍ厚的钢纤维增强喷射混凝土；对原设计２００ｍｍ厚的金属网喷射混凝土改用１３０ｍｍ厚的钢纤维增强混凝土。在喷射混凝土机械臂的喷射能力为６～１２ｍ￣３／ｈ的条件下，采用金属网喷射混凝土，从打眼、放炮、初喷、装网到复喷，一循环约需１４ｈ；而采用钢纤维增强喷射混凝土，一循环仅需６．５ｈ。（建信）钢纤维喷射混凝土支护 Steel fiber reinforced concrete shotcrete support According to the British “Tunnels and Tunnels” 1992 the ninth period reported Hong Kong Shing Mun Road tunnel in 760m with wet mixing steel fiber reinforced shotcrete support (including the original design of large steel arch support Weathered granite 130m tunnel). The construction uses a hydraulically actuated Robot75 jet concrete arm equipped with a self-oscillating nozzle. Spraying concrete ratio: cement 450kg, packing 1640kg, water 200kg, cement quick-setting agent 10%, Belgian production DramixZP30 / 50 hook steel fiber, with a rate of 50kg / m ~ The original design 100mm thick metal mesh shotcrete to 65mm thick steel fiber reinforced shotcrete; the original design of 200mm thick metal mesh shotcrete to 130mm thick steel fiber reinforced concrete. Spraying concrete arm in the jetting capacity of 6 ~ 12m ~ 3 / h conditions, the use of metal mesh sprayed concrete, from the drilling, blasting, the initial spray, loading network to complex spray, a cycle takes about 14h; and the use of steel fiber Reinforced shotcrete, a cycle of just 6.5h. (Jianxin) steel fiber jet concrete support