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Construction method for exposed section of large-span multi-arch tunnel body
The invention discloses a large-span multi-arch tunnel body outcrop section construction method which comprises the specific steps that S1, fender posts and baffle walls are constructed at the rock-free supporting position of the outer side of a right tunnel, S2, foam concrete backfilling is conducted at the suspended position of a tunnel bottom plate till the elevation of a structural bottom plate is reached, S3, a temporary edge upward slope is excavated and protected, and S4, the tunnel body outcrop section is constructed. S4, a tunnel main hole is excavated, and the top is backfilled; according to the construction method for the exposed section of the large-span multi-arch tunnel body, fender posts and baffle walls are constructed at the rock-free supporting positions of the outer side of a right hole, foam concrete backfilling treatment is conducted according to the suspension condition of a tunnel bottom plate, then a temporary edge and an upward slope are excavated and protected, and finally tunnel main hole construction excavation and top backfilling are conducted. The problems that no surrounding rock exists on the outer side of the tunnel, effective supporting is lacked, the stress unbalance influence is brought to the whole lining structure of the tunnel, an inverted arch cannot be laid due to the fact that a tunnel bottom plate is suspended, and normal excavation of a pilot tunnel in the tunnel is influenced are solved, and the quality safety of the tunnel body exposed section lining structure is greatly improved.
本发明公开了一种大跨度连拱隧道洞身露头段施工方法，具体步骤包括S1：于右洞外侧无岩体支撑处施做围护桩及挡板墙，S2：于隧道底板悬空处进行泡沫混凝土回填至结构底板标高，S3：开挖临时边仰坡并进行防护，S4：开挖隧道主洞并对顶部进行回填；该大跨度连拱隧道洞身露头段施工方法，通过对右洞外侧无岩体支撑处施做围护桩及挡板墙，针对隧道底板悬空情况进行泡沫混凝土回填处理，继而开挖临时边仰坡并防护，最后进行隧道主洞施工开挖及顶部回填，解决了隧道外侧无围岩缺乏有效支撑，给隧道整体衬砌结构带来受力不均衡影响和隧道底板悬空导致无法铺设仰拱，影响隧道中导洞正常开挖的问题，极大地提升了洞身裸露段衬砌结构的质量安全。
Construction method for exposed section of large-span multi-arch tunnel body
The invention discloses a large-span multi-arch tunnel body outcrop section construction method which comprises the specific steps that S1, fender posts and baffle walls are constructed at the rock-free supporting position of the outer side of a right tunnel, S2, foam concrete backfilling is conducted at the suspended position of a tunnel bottom plate till the elevation of a structural bottom plate is reached, S3, a temporary edge upward slope is excavated and protected, and S4, the tunnel body outcrop section is constructed. S4, a tunnel main hole is excavated, and the top is backfilled; according to the construction method for the exposed section of the large-span multi-arch tunnel body, fender posts and baffle walls are constructed at the rock-free supporting positions of the outer side of a right hole, foam concrete backfilling treatment is conducted according to the suspension condition of a tunnel bottom plate, then a temporary edge and an upward slope are excavated and protected, and finally tunnel main hole construction excavation and top backfilling are conducted. The problems that no surrounding rock exists on the outer side of the tunnel, effective supporting is lacked, the stress unbalance influence is brought to the whole lining structure of the tunnel, an inverted arch cannot be laid due to the fact that a tunnel bottom plate is suspended, and normal excavation of a pilot tunnel in the tunnel is influenced are solved, and the quality safety of the tunnel body exposed section lining structure is greatly improved.
本发明公开了一种大跨度连拱隧道洞身露头段施工方法，具体步骤包括S1：于右洞外侧无岩体支撑处施做围护桩及挡板墙，S2：于隧道底板悬空处进行泡沫混凝土回填至结构底板标高，S3：开挖临时边仰坡并进行防护，S4：开挖隧道主洞并对顶部进行回填；该大跨度连拱隧道洞身露头段施工方法，通过对右洞外侧无岩体支撑处施做围护桩及挡板墙，针对隧道底板悬空情况进行泡沫混凝土回填处理，继而开挖临时边仰坡并防护，最后进行隧道主洞施工开挖及顶部回填，解决了隧道外侧无围岩缺乏有效支撑，给隧道整体衬砌结构带来受力不均衡影响和隧道底板悬空导致无法铺设仰拱，影响隧道中导洞正常开挖的问题，极大地提升了洞身裸露段衬砌结构的质量安全。
Construction method for exposed section of large-span multi-arch tunnel body
一种大跨度连拱隧道洞身露头段施工方法
JIANG ZHENGFENG (author) / WANG YU (author) / REN CHANGMING (author) / YANG LIMING (author) / NIE ZHILIANG (author) / WANG CHENG (author) / TIAN JIANCHONG (author) / WANG GUOJIN (author) / ZENG XIAOWEI (author) / ZHANG SHICHAO (author)
2023-06-30
Patent
Electronic Resource
Chinese
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