Water conveyance tunnel with prestressed composite lining for shield tunnelling

Abstract

The invention provides a water conveyance tunnel with a prestressed composite lining for shield tunnelling. The tunnel comprises an ordinary reinforced concrete outer lining (1) which is formed by shield construction and is an assembled segment ring, wherein segments on the same ring are connected by connecting bolts (2); dowel bars (3) are installed in hand holes on the assembled segment ring; concrete is directly poured on the outer lining (1) to form an inner lining (5); shear keys (6) are formed in such a manner that concrete is filled in the hand holes of the outer lining; and the inner lining (5) and the outer lining (1) are combined via the dowel bars (3) and the concrete shear keys (6) to form a composite lining structure. Thus, the defects of great construction difficulty, long construction period and higher investment caused by the separated pressure pipeline water conveyance scheme for shield tunnelling are overcome. The technical problems of high head, high flow, high load and possibility of endangering the tunnel safety due to seepage of underground water, which are encountered when the soft soil layer of the riverbed is tunnelled in the shield tunnelling construction of the Yellow River crossing tunnel, are solved. Besides, the invention reduces the project investment and has obvious social benefits.

Description

technical field [0001] The invention relates to a novel pressure water conveyance tunnel constructed by shield tunneling method, more specifically, it is a shield tunnel prestressed composite lining water conveyance tunnel. Background technique [0002] The first phase of the South-to-North Water Diversion Middle Line Yellow River Project is a first-class project. The double-line Yellow River Crossing Tunnel is a first-class building with a circular cross-section, an inner diameter of 7m, and a single tunnel length of 4.25km. It is an underwater tunnel project for pressure water delivery. The internal water pressure is greater than 0.5MPa; the shield method is used to pass through the soft soil layer of the Yellow River bed, and the top of the cave is buried more than 30 meters deep. In addition to the earth pressure, there is also external water pressure on the outside, which is about 0.37MPa in the center of the tunnel. [0003] In hydraulic structures, pressure water deli...

AI Technical Summary

Problems solved by technology

Studies have shown that due to the tunnel’s single-head excavation of 4.25km, long lines, narrow construction space, and very harsh conditions for steel pipe installation and welding, the construction difficulty is greatly increased. Moreover, the construction period is long, the operation and management conditions are poor after completion, and the investment is large. not adopted

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