An artificial island structure for relay extension of floating tunnel

Abstract

The invention discloses an artificial island structure for the relay extension of a floating tunnel, which comprises a lower island base and an upper vertical island body; the island base is constructed of multiple layers of backfill sand, and each layer of backfill sand is made of super large concrete It is built in the cofferdam formed by the submersion of the buoyancy tank, and the outer dimension of each layer of cofferdam gradually decreases upwards, so that the shape of the island base is pyramid-shaped; the upper vertical island body is composed of the island wall and the inner body of the island; the island wall is composed of The steel cylinder grid and the dense packing inside are composed together. The steel cylinder grid is composed of a large steel cylinder main grid and a straight-web steel sheet pile auxiliary grid. The steel large cylinder main grid and the straight-web steel sheet pile All subcells shall be backfilled with sand and compacted, and within 1m from the top of the island wall, gravel cushion and block stone cushion shall be used to protect the surface; the inner body of the island shall be composed of backfilled sand. The artificial island structure of the present invention has the characteristics of self-stability, construction difficulty and relatively small engineering quantity, and can be used for the relay extension of the floating tunnel and the anchorage in the sea of ​​the cable.

Description

technical field [0001] The invention relates to an underwater floating tunnel, in particular to an artificial island structure used for the relay extension of the floating tunnel. Background technique [0002] The submerged floating tunnel, the English name is "Submerged Floating Tunnel", referred to as "SFT". Also known as "Archimedes Bridge" in Italy. The difference between floating tunnels in water and traditional buried tunnels or excavated tunnels is that the floating tunnel structure is surrounded by water, neither on the ground nor through the ground, but mainly depends on the gravity of its own structure, the buoyancy and support of the structure The anchoring force of the system is used to keep it in a fixed position. The suspension tunnel is sealed all around, and this structure has all the characteristics of ordinary tunnels, and should be considered as a "tunnel" rather than a "bridge" from the point of view of use. [0003] Although floating tunnels have cert...

AI Technical Summary

Problems solved by technology

The buoy-type floating tunnel is suspended on the buoy on the water surface through anchor cables or anchor chains. The gravity of the tunnel is greater than the buoyancy, and the vertical direction is greatly affected by the fluctuation of the tide level; On the anchorage foundation below the bed, the gravity of the tunnel is less than the buoyancy, and the tunnel will displace or shake under the action of hydrodynamic forces; the pier-column type is actually a tunnel bridge supported on underwater pier columns, and the construction is difficult and expensive

Since the tunnel floats in the water, the installation and construction of the tunnel is affected by wind, waves, currents and ship waves. The underwater positioning of the three types of tunnels and the underwater or underwater docking construction are very difficult, and the comfort and safety of the underwater operation period Risks are unpredictable

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