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双圈环绕无粘结预应力锚索技术是当前世界上隧洞施工中最先进的技术 ,该技术成功地解决了薄覆盖层的地下洞室群密集分布与高水头压力对洞室承压要求的矛盾 ,最大限度地缩小了开挖洞径 ,减少了洞身衬砌的钢筋安装量与混凝土浇筑量 ,降低了成本。小浪底排沙洞无粘结预应力混凝土施工的施工程序和施工方法对类似工程有参考价值。
The double-loop surrounding unbonded prestressed anchor cable technology is the most advanced technology in the current tunnel construction in the world. This technology successfully solves the problem of densely distributed underground cavern groups with thin coverings and pressure requirements of high head pressure on the cavern Contradictions, to minimize the excavation of the tunnel, reducing the amount of installation of reinforced concrete lining and pouring volume of concrete, reducing costs. The construction procedure and construction method for the un-bonded prestressed concrete construction of Xiaolangdi sand-discharging tunnel have reference value for similar projects.