A Construction Method for Shallow Burying and Undercover Excavation of Large-Scale Underground Space - Horizontal Hole Covering Method

Abstract

The invention discloses a transverse tunnel cover method for shallow-buried underground excavation large underground space construction. Foundation pits or pilot tunnels are formed, in the longitudinal direction of underground space, of the tops of side walls of the underground space to be constructed, temporary transverse stress structures are formed inside the foundation pits or the pilot tunnels at a time and located above a top plate of the underground space to be constructed and are controllable in rigidity, the temporary transverse stress structures are connected with piles inside the foundation pits or the pilot tunnels to form a temporary transverse top cover-pile bearing system, and under protection of the transverse top cover-pile bearing system, a single-span or multi-span and a single-layer or multi-layer underground space structure can be constructed in a sequential construction mode or in an inverse construction mode. In shallow-buried underground excavation large underground space structure construction, ground settlement is effectively controlled, constructed building deformation is reduced, the construction risks are reduced, the construction period is shortened, and the construction cost is lowered.

Description

technical field [0001] The invention relates to the technical field of underground construction engineering, in particular to a construction method suitable for shallow burial and underground excavation of large-scale underground spaces-the horizontal hole cover method. Background technique [0002] At present, the main idea of ​​the construction method widely used in the construction of shallow buried and underground excavation large-scale underground space is to divide the proposed underground space into several small sections or pilot tunnels horizontally. Excavate the longitudinal cavern, construct the temporary horizontal support structure or the top horizontal load-bearing structure in time, and then repeat the above steps until the individual horizontal temporary support structures or the top horizontal load-bearing structure can be connected as a whole to form a temporary horizontal cross-section of the underground space. The support system or the top lateral load-be...

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Problems solved by technology

Its disadvantages are that, firstly, compared with CN103485790A, although the number of pipe curtains is effectively reduced, because the length of pipe curtains is still relatively large, the construction precision is high, and more construction work surfaces cannot be opened up, and the construction efficiency is low; Second, the load-carrying capacity of the pipe curtain is controlled by the occlusal joints between the pipe curtains, which has extremely high requirements on the construction accuracy of the pipe curtains, the articulation of the joints, and the strength of the joints; third, it is controlled by the strength of the joints between the pipe curtains. In this method, the underground space Structures can only be implemented in reverse

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