The application of rockfill grouting technique instread of placed rockfill to diversion tunnel vault with simple equipment such as YTP-26 type pneumatic rock drill improves the load transfer conditons of lining wall,fulfilling quality requirements.
为解决复杂地质条件下隧道拱顶块石回填后与围岩的间隙 ,并将干砌块石转化为压浆混凝土 ,改善衬砌结构物传力条件 ,用YTP— 2 6型风动凿岩机等简易设备进行回填灌浆 ,达到了设计要求。