Zigzag inclined shaft construction structure suitable for underground excavation of subway station in offshore downtown area

Abstract

The invention discloses a zigzag inclined shaft construction structure suitable for underground excavation of a subway station in an offshore downtown area. The zigzag inclined shaft construction structure comprises the underground excavation subway station and a zigzag inclined shaft construction section located on one side of the underground excavation subway station; the zigzag inclined shaft construction section comprises an open excavation section with the top open and communicating with the ground and an underground excavation section communicating with the underground excavation subway station; the open excavation section and the underground excavation section communicate with each other and are spliced to form a zigzag inclined shaft; steel sheet piles used for limiting the grouting range are arranged on the peripheral side of the joint of the open excavation section and the underground excavation section; and the area defined by the steel sheet piles is a ground surface grouting area. According to the zigzag inclined shaft construction structure, the zigzag inclined shaft is arranged by utilizing an existing narrow vertical shaft construction site, and the advantages of being high in transport capacity, high in site utilization rate, simple in structure and free of hoisting equipment are achieved; and the transport capacity can be greatly improved, the construction speed is increased, and the zigzag inclined shaft construction structure is especially suitable for auxiliary tunnel construction during construction of the underground excavation subway station in the downtown area in offshore engineering.

Description

technical field [0001] The invention belongs to the field of urban underground space engineering construction, and in particular relates to a construction structure of an inclined shaft suitable for excavating a subway station in an offshore downtown area. Background technique [0002] With the continuous expansion of city scale and traffic congestion, more and more cities have begun to carry out subway construction. For the downtown areas of coastal cities, on the one hand, the subway construction in this area cannot be excavated with open cuts. Therefore, underground excavation of subway stations is an inevitable choice for excavation in downtown areas. For the construction of underground excavation stations, materials, muck, etc. Access and exit are carried out through auxiliary tunnels such as shafts. However, shafts have problems such as slow transportation capacity, high requirements for lifting equipment, and complicated construction organization and management. If th...

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Problems solved by technology

For the downtown areas of coastal cities, on the one hand, the subway construction in this area cannot be excavated with open cuts. Therefore, underground excavation of subway stations is an inevitable choice for excavation in downtown areas. For the construction of underground excavation stations, materials, muck, etc. Access and exit are carried out through auxiliary tunnels such as shafts. However, shafts have problems such as slow transportation capacity, high requirements for lifting equipment, and complicated construction organization and management. If the buried depth of the subway station is large, it will greatly restrict the construction speed and affect the construction efficiency. Increasing the construction period will also bring noise impact on surrounding residents and huge social impact

In addition, during the construction of underground space projects such as subways in offshore cities, strata that are soft at the top and hard at the bottom are often encountered. Due to the existence of water-permeable layers (such as high-permeability rock layers such as sand layers) in this stratum, seawater can pass directly into the construction area, resulting in grouting During operation, the grout takes a long time to solidify and spreads in a large range, and the grouting effect is poor, which has an adverse effect on the construction process

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