Underground engineering multi-span multi-layer tunnel excavation method

Abstract

The invention relates to an underground engineering multi-span multi-layer tunnel excavation method which comprises the following construction steps that S1, bottom layer lower pilot tunnels are excavated at connecting parts of all spans, and bottom longitudinal beam foundation structures are constructed in the lower pilot tunnels; S2, upper pilot tunnels corresponding to the lower pilot tunnels are excavated, and top longitudinal beam structures are constructed in the upper pilot tunnels; S3, structural columns for connecting the top longitudinal beam structures and the bottom longitudinal beam foundation structures between all the spans are constructed in sequence; S4, arch slab structures are constructed below arch structures between the top layer structural columns of all the spans; S5, multiple layers of side-span tunnel structures at the leftmost side structural columns and the rightmost side structural columns are excavated correspondingly; and S6, residual structures between the structural columns of all the spans are constructed. According to the excavation method, vertical force transmission structures between the spans are sequentially constructed through the small pilot tunnels, then vertical bearing systems on the tops of the spans are constructed, and finally the side-span structures and the remaining structures between the spans are constructed, so that the construction risk in the excavation process of an existing large-section tunnel underground excavation method is effectively avoided.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to a multi-span and multi-layer tunnel excavation method for underground engineering with high construction safety, short construction period and small ground subsidence. Background technique [0002] With the development needs of urban transportation, the development of underground space has been paid attention to. However, most of the development locations are located under the road. Due to the constraints of traffic guidance and other factors, underground excavation method is required for construction. Among them, when tunnels with asymmetric multi-span and multi-storey structures are constructed by underground excavation methods, for example, side piles need to be installed using the traditional hole pillar method and hole pile method, resulting in high cost and long construction period; using partial excavation Such as the side hole method and the middle hole method, alth...

AI Technical Summary

Problems solved by technology

[0003] When constructing asymmetric multi-span and large-section tunnels based on the existing traditional underground excavation method, there are problems such as strong limitations, high risks, and high costs. The multi-span and multi-span tunnel excavation method for underground engineering is to construct the vertical load-bearing system at the top of each span, and finally construct the side-span structure and the remaining structure between each span, which effectively avoids the existing large-section tunnel excavation method Construction risks during excavation

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