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    • 11. 发明专利
    • SLEEPER
    • JP2002167701A
    • 2002-06-11
    • JP2000367403
    • 2000-12-01
    • SEKISUI CHEMICAL CO LTD
    • MATSUO RYUICHI
    • E01B3/44E01B3/02E01B3/46
    • PROBLEM TO BE SOLVED: To provide a sleeper, in particular, a branched sleeper and a sleeper provided in a joint part of rails capable of preventing shifting sideways and reduction of strength due to wear even if settlement of track, vibration, and sideways shifting force occur. SOLUTION: A wear-resistant material layer is provided on a bottom face of a sleeper main body, and many holes catching a ballast material are provided in the wear-resistant material layer. As for a size of the hole, it is preferable that a length in the longitudinal direction of the sleeper is 3 to 25 mm, an area of the hole occupying an area of the wear-resistant material layer is 40 to 80%, and a depth of the hole is 3 mm to a thickness of the wear-resistant material layer or less. The wear-resistant material layer is provided at a position where a load is directly applied from the rail of the sleeper, a length in the longitudinal direction of the sleeper is a width at which a load is directly applied or more and 40% or less of the length of the sleeper, and a thickness is 10 mm or more.
    • 14. 发明专利
    • DEVICE FOR RESTRICTING TIDE CURRENT IN ONE DIRECTION
    • JPH01230804A
    • 1989-09-14
    • JP5809188
    • 1988-03-10
    • AGENCY IND SCIENCE TECHN
    • FUJIWARA TATSUKI
    • E02B1/00E01B3/02E02B3/02
    • PURPOSE:To enable inflow of tide current in one direction so as to introduce the sea water in a clean sea area to an aimed sea area for effectively cleaning the sea area by providing a cut-off curtain, on a route of the tide current, for passing the tide current in the outward direction and cutting off the tide current in the inward direction. CONSTITUTION:On the upper surfaces of right and left blocks 1 mounted on the sea bottom are provided hooks 2 with the tips thereof previously directed in the outward direction of tide current. One end of a rope 3 is connected to the hook 2 and the other end is connected to a float 4 so as to hold the rope 3 as a guide member, as being stood, in the sea. Both upper ends of a curtain body 5 made of a square synthetic resin sheet are fixed on the attachment part of the ropes 3 to the floats, and both lower ends of the curtain body 5 are connected to ring bodies 6 into which the ropes 3 are inserted. In the outward direction of the tide current, the curtain body 5 is folded in two along the tide current by receiving a fluid pressure in one direction and the tide current mainly flow in the arrow direction through the lower side of curtain body 5, the flow rate and flow velocity not being reduced. In the inward direction of the tide current, the curtain 5 is drawn by drawing the lower end thereof through the ring bodies 6, so that the curtain body 5 receives the fluid pressure on the back surface to be expanded up and down, thus cutting off the tide current.