| 摘要 |
PROBLEM TO BE SOLVED: To ensure reliable sealing by butting a rubber gasket attached to the end face of an adjacent immersed tube against the roughened face of the end face of the other immersed tube. SOLUTION: A rubber gasket 2 made up of a fixing portion 20 to be fixed to an immersed tube 1 and a main portion 21 having a trapezoidal cross section, is attached to the end face 10 of one adjacent immersed tube 1, and the head 22 thereof is butted against the end face 10 of the other immersed tube 1. And then, in the end face 10 of the other immersed tube 1, a roughened layer is formed by applying a paint, etc., where hard fine grains are dispersed in a resin binder for example. As a result, as frictional resistance between the rubber gasket and the end face of the immersed tube can be increased, the rubber gasket can be reliably kept from falling laterally, and sealing can be maintained reliably. And even if an immersed tunnel, etc., installed on the soft ground, etc., moves significantly due to an earthquake, accidental ingress of water into a tunnel can be controlled reliably. |
