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喷射混凝土是一种新型的支护结构,广泛应用于边坡、隧道围岩、基坑等加固工程的施工。喷射混凝土将运输、浇筑、振捣等工序合而为一,施工灵活简捷,具有强度增长快、粘结力强、密实性好的特点。本文根据新建重庆涪丰石高速公路A3标段田家院子隧道为例,论述了隧道初期支护喷射混凝土湿喷工艺及喷射混凝土的质量控制要点,总结施工经验和注意事项,为同类型工程施工提供参考。
Sprayed concrete is a new type of support structure, which is widely used in the construction of slope, tunnel surrounding rock, foundation pit and other reinforcement projects. Shotcrete will transport, pouring, vibrating and other processes into one, flexible and simple construction, with the strength of fast growth, strong bonding, dense and good characteristics. Based on the case of Tianjiayuanzi Tunnel in section A3 of Fufeng Expressway in Chongqing, this paper discusses the key points of wet spraying technology and the quality control of shotcrete in tunnel initial support construction, summarizes the construction experience and precautions, and provides the same type of project construction reference.