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我国自1974年开始应用喷锚(锚杆喷混凝土简称)整治既有线隧道开裂破损衬砌,迄今在成昆、梅集、朝开、图佳、丰沙、宝成、宝天等线,对各种裂损类型的衬砌整治了近10延长公里,显示出良好的技术经济效果。它不但能较好的使裂损衬砌恢复正常运用状态(下面对这种裂损衬砌经喷锚整治后恢复正常使用的支护结构物叫“裂损衬砌喷锚支护”),而且还具有施工时对行车干扰小,施工进度快,造价低等一系列优点。据初步统计分析,每米造价约为1000～1800元,也有的甚至只有600元左右;施工进度接近80米/月。若与传统的
Since 1974, China has applied spray anchor (shortened for shotcrete) to crack and crack linings of existing tunnels. Up till now, there are a lot of lines such as Chengkun, Meiji, Chaohang, Tujia, Fengsha, Baocheng and Baotian etc. Kinds of cracking type of lining remediation nearly 10 km long, showing good technical and economic results. It can not only make the lining of the cracked lining work normally (the following supporting structure of the lining which is repaired and repaired by spray anchor repairing is called “cracked lining spray anchor support” below) With the construction of a small interference on the road, the construction speed, low cost and a series of advantages. According to preliminary statistical analysis, the cost per meter is about 1000 ~ 1800 yuan, and some even only about 600 yuan; construction progress nearly 80 meters / month. If with traditional