随着隧道复合式衬砌结构已成主流,单层衬砌也得到重视和发展,喷射混凝土设计基准强度将提高,环保要求将越来越严,作业人员的环保意识也越来越强。由于劳动强度大,功效低,粉尘大,回弹量高,耐久性差,物料搅拌不均匀,质量不易控制,性能不稳定,混凝土早期强度低等缺点,干喷工艺已逐渐被淘汰,取而代之的是具有回弹量低,质量易控制,性能稳定,混凝土早期强度高等优点的湿喷工艺。 With the tunnel composite lining structure has become the mainstream, single-layer lining has also been valued and developed, shotcrete design benchmark will increase the intensity of environmental protection requirements will be more stringent, the environmental awareness of workers is also growing. Due to the labor-intensive, low efficiency, dust, high rebound, poor durability, uneven material mixing, quality is not easy to control, unstable performance, low early strength concrete, dry spray process has been gradually eliminated, replaced by With a low rebound, easy to control the quality, stable performance, early strength of concrete wet spray technology.