Construction method for shallow depth bored tunnel to penetrate through box culvert

Abstract

The invention discloses a construction method for a shallow depth bored tunnel to penetrate through a box culvert. The method comprises the following steps of construction preparation, construction of a preparation section, determination of the size of a box culvert section, construction of a sagging transitional section, construction of the box culvert section, construction of an upward-tilting transitional section, construction of an ending section, inspection of the supporting strength, and restoration of normal excavation of the constructed tunnel. The transition sections of the tunnel are short, the bottom of the tunnel is unchanged in excavation depth, only the shape of the section of the tunnel is changed, the influence of the existing box culvert on tunnel construction is ingeniously avoided, and the construction progress is guaranteed on the premise that the construction safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of construction of shallow-buried underground excavation tunnels, in particular to a construction method for shallow-buried underground excavation tunnels passing through box culverts. Background technique [0002] With the development of the national economy and the acceleration of urbanization, the domestic urban subway traffic construction is developing more and more rapidly. In the construction of subway transportation, it is often encountered that the tunnel crosses ground obstacles such as existing buildings, roads, and water channels, as well as underground obstacles such as underground sewers, box culverts, and pipelines. Such sections often affect the progress and construction of tunnels. Safety. When constructing tunnels in such sections, it is necessary to control the settlement within the influence range of the tunnel and ensure the safety and smooth progress of the project itself. Therefore, it ...

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Problems solved by technology

[0003] The box culvert is a common drainage device in urban underground buildings. When tunnels are buried shallowly, the excavation depth of the tunnel can be lowered in advance when encountering a box culvert, and then safely pass through the lower part of the box culvert. However, this method requires a large distance in advance to start inclining Excavating tunnels increases the depth of tunnel construction, but the scope of underground construction tunnels is limited, and the impact of box culverts on tunnels cannot be completely avoided in shallow buried layers. Not only does it need to change the construction direction too much, but also cannot obtain ideal results

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