Tunnel primary support structure

The utility model discloses a tunnel primary support structure, which is paved on an excavated tunnel contour surface, and comprises a cement blanket paved on the tunnel contour surface; steel fibers are added into the cement blanket; the reinforcing mesh is laid on the cement blanket; and the steel arch frame is erected along the tunnel contour surface, abuts against the reinforcing mesh and provides support for the reinforcing mesh. When the technical scheme provided by the utility model is implemented, the efficiency is not influenced by the field size and the shotcrete anchoring area, the problem that the surrounding rock is exposed in a large area for a long time in mechanical shotcrete anchoring is avoided, and the self-stabilization capability of the surrounding rock is favorably exerted. 本实用新型公开了一种隧道初支结构，铺设在开挖完毕的隧道轮廓面上，所述隧道初支结构包括：水泥毯，其铺设在所述隧道轮廓面上；所述水泥毯中加入钢纤维；钢筋网片，其铺设在所述水泥毯上；以及钢拱架，其沿着所述隧道轮廓面架设，且顶在所述钢筋网片上，为所述钢筋网片提供支撑。可以适用软弱破碎围岩地层中隧道掘进的快速初支，该实用新型提供的技术方案在实施时，其效率不受场地大小和喷锚区域面积影响，避免了机械喷锚中长时间、大面积暴露围岩的问题，有利于发挥