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发明公开
CN103437783A 浅埋暗挖大跨度隧道导洞拱盖组合施工工法 无效 - 撤回

浅埋暗挖大跨度隧道导洞拱盖组合施工工法
摘要：
本发明公开了一种浅埋暗挖大跨度隧道导洞拱盖组合施工工法，包括以下步骤：一）首先在两排洞内围护桩的设计施工位置上方分别开挖一导洞，并施工导洞支护结构；二）待导洞支护结构完成后，在导洞内施工洞内围护桩；三）待两排洞内围护桩施工完成后，在每排洞内围护桩的桩顶上均施工一根拱脚冠梁；四）待拱脚冠梁达到设计强度后，在两根拱脚冠梁之间施工拱盖结构；五）待拱盖结构达到设计强度后，由上至下开挖隧道至隧道二衬结构底板底标高处；六）然后由下至上顺做隧道二衬结构。本发明能够广泛适用于上半部围岩较软，下半部围岩较硬的“上软下硬”地质情况，保证隧道的结构安全。
摘要（英）：

The invention discloses a shallow-buried excavation long-span pilot tunnel arch cover combined construction method. The method comprises the following steps that a pilot tunnel is excavated above the design and construction position of each fender post in two rows of holes, and pilot tunnel supporting structures are constructed; after the pilot tunnel supporting structures are constructed, fender posts are constructed in the holes; after the fender posts in the holes are constructed, an arch springing crown beam is constructed on the post top of each fender post in each row of holes; after the arch springing crown beams achieve design strength, an arch cover structure is constructed between every two arch springing crown beams; after the arch cover structures achieve design strength, a tunnel is excavated to a tunnel two-lining structure base plate bottom elevation position from top to bottom; tunnel two-lining structures are constructed in sequence from bottom to top. The shallow-buried excavation long-span pilot tunnel arch cover combined construction method can be widely applied to the upper-soft and lower-hard geological condition that surrounding rocks on the upper half portion are soft and surrounding rocks on the lower half portion are hard, and ensures structure safety of the tunnels.

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