Arch crown immersed tube tunnel
A technology for immersed tunnels and vaults, applied in water conservancy projects, artificial islands, underwater structures, etc., can solve problems such as affecting vibration, inconvenient construction operations, and inability to ensure concrete compactness, etc., to reduce project costs and reduce costs. Construction difficulty and the effect of optimizing the stress on the top structure
Active Publication Date: 2014-02-12
CCCC SECOND HARBOR ENG
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Problems solved by technology
[0005] With the traditional rectangular cross-section design, the stress on the roof is similar to that of a continuous beam structure. Considering the crack resistance of the wall of the immersed tube, the reinforcement ratio of the immersed tunnel is much higher than that of other reinforced concrete structures. It is inconvenient and even affects the vibration, and the concrete density cannot be guaranteed. For example, in the construction of the island tunnel project of the main project of the Hong Kong-Zhuhai-Macao Bridge, there has been a problem that the concrete has reached the limit of vibration during the pouring process due to the increase in the reinforcement ratio.
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[0017] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
[0018] Such as figure 1 , figure 2 The shown existing immersed tube tunnel has been described in detail in the background art, and will not be repeated here.
[0019] According to the background technology, as the span of the immersed tube tunnel increases, if the original rectangular section is still used, the transverse size of the immersed tube tunnel, that is, the transverse span, increases, correspondingly, reinforcement must be increased to meet the structural force requirements. However, the requirement of construction operability to control the reinforcement ratio makes it impossible to increase the reinforcement all the time. Therefore, starting with changing the cross-sectional form to reduce the lateral size of the immersed tube tunnel, and then reduce the reinforcement, is the only way to solve this contradiction.
[0020] Based on the above...
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The invention discloses an arch crown immersed tube tunnel. The arch crown immersed tube tunnel comprises at least one immersed tube single body, wherein the top portion of each immersed tube single body is of an arch structure, each immersed tube single body comprises a longitudinal through hole channel and a longitudinal through tube gallery, each tube gallery is arranged above the corresponding hole channel, a passageway is arranged between each tube gallery and the corresponding hole channel, and a smoke discharge channel is arranged in each tube gallery. The improved immersed tube tunnel has the advantages that the structural stress of the top portion of the tunnel is optimized, construction difficulty is lowered, duration of a project is shortened, and project cost is reduced.
Description
Technical field [0001] The invention relates to the technical field of immersed tube tunnels, in particular to an immersed tube tunnel with a vault top. Background technique [0002] Immersed tube tunnels have become the preferred construction method for large-scale underwater tunnel projects. A reasonable tunnel section will help improve the space utilization rate of the tunnel, meet the stress state of the tunnel structure, and can save the construction period and reduce the project cost. The cross-section of the tunnel is determined based on traffic demand and ventilation requirements, and considering loads from water pressure and back-siltation. Existing conventional immersed tube tunnels are mostly cross-sections of two-hole one-tube gallery or multi-hole multi-tube gallery. The holes are either round or square. The holes are arranged side by side with the pipe gallery, and the exhaust ducts and fans are installed in the pipe gallery. At present, the widest immersed tube tu...
Claims
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IPC IPC(8): E02D29/073
Inventor 张鸿翟世鸿李宗哲游新鹏曾健黄修平陈培帅李鑫高雄
Owner CCCC SECOND HARBOR ENG