Construction method for underground excavation and cover excavation of subway station tunnel structure: Fid-Bau Portal

Construction method for underground excavation and cover excavation of subway station tunnel structure

LIU NAN / TONG XIAO / LI ZHAOLONG / FENG CHUNLEI

The invention discloses an underground excavation and cover excavation subway station tunnel structure construction method in the field of underground engineering construction, which comprises the following steps: S1, acquiring peripheral geological data, and marking peripheral geological distribution of a construction tunnel according to the peripheral geological data; s2, consolidating the complex geology around the tunnel according to the marks, drilling a central channel and lateral channels, enabling the lateral channels to be located on the two sides of the central channel, filling the central channel and the lateral channels in a grouting mode, and setting a fixing block at the position, close to the cover plate, of the central channel; s3, during cover excavation, anchor cables are connected between the fixing blocks and the tops of the lateral channels, and cover plates are built on the basis of the anchor cables; during underground excavation, the central channel is reserved, the tunnel is excavated from top to bottom, triangular auxiliary rods are arranged between the central channel and the lateral channels, and then a cover plate and lateral building blocks of the tunnel are built; therefore, the stress deformation area can be pre-consolidated to guarantee the construction safety.

本发明公开了地下工程施工领域的一种暗挖与盖挖地铁车站隧洞结构施工方法，包括以下步骤：S1、获取周边地质数据，并以周边地质数据对施工隧洞的周边地质分布进行标记；S2、根据标记对隧洞周边的复杂地质进行巩固，钻取中心通道和侧向通道，侧向通道位于中心通道的两侧，通过注浆的方式对中心通道和侧向通道进行填充，并在中心通道靠近盖板的位置设定固定块；S3、在盖挖时，在固定块与侧向通道的顶部之间连接锚索，并以锚索为基础搭建盖板；在暗挖时，保留中心通道，并按从上到下的顺序进行挖取隧洞，并在中心通道与侧向通道之间布置呈三角形的辅助杆，再搭建隧洞的盖板和侧向砌块；从而能对应力变形区进行预巩固，以保障施工安全。

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