Underground structure and construction method thereof

Abstract

The invention relates to the field of underground engineering, in particular to an underground structure and a construction method thereof.The underground structure comprises an outer arch and an inner arch, the inner arch is oval and arranged in the middle of the outer arch, the top of a long shaft of the inner arch is connected with the top of the outer arch, and the bottom of the long shaft of the inner arch is connected with an inverted arch; the method comprises the steps that an outer arch contour is divided into a plurality of small sections through geological exploration, a plurality of small module tunnel boring machines are adopted for excavation at the same time to form a complete outer arch contour, steel shell concrete members are prefabricated and connected and poured along the outer arch contour, and a complete outer arch is formed. Under the supporting protection of the outer arch, a large-scale construction machine can be adopted to excavate the interior of the outer arch, the truss units, the middle plate and the bottom plate are excavated from top to bottom and erected, and finally the remaining inner arch is constructed, so that through the double-arch structure, the load can be effectively shared, the stability of the structure is improved, the instability of the outer arch shell is avoided, and the safety of the deeply-buried large-span structure is improved.

Description

Technical field [0001] The present invention relates to the field of underground engineering, in particular to an underground structure and a method of construction thereof. Background [0002] At present, the shallow underground space buried within 20 meters of the big city has been occupied by various underground pipelines, subways, highway tunnels and other existing underground structures, and the utilization of shallow and middle underground space is becoming increasingly saturated. With the continuous development of urban construction, the urban underground space planned and constructed in the later stage will have to adopt a deep burial scheme, and the burial depth is often greater than 30m. [0003] For the urban shallow buried underground space, China has formed a relatively mature structural form and construction technology, but with the increase of the burial depth of the underground structure, many existing structural forms and construction methods are no longer applic...

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Problems solved by technology

[0003] For urban shallow buried underground spaces, my country has formed relatively mature structural forms and construction technologies. However, with the increase of buried depth of underground structures, many existing structural forms and construction methods are no longer applicable, and it is necessary to find a Reasonable structural form, on the premise of meeting the structural span requirements and various functional requirements of the underground space, ensures the safety, efficiency and quality of the construction, and ensures the safety, stability, durability and anti-leakage of the structure during use ability

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