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    • 3. 发明专利
    • INFILTRATION OPEN CHANNEL
    • JP2000064406A
    • 2000-02-29
    • JP23437698
    • 1998-08-20
    • HANEDA HUME PIPE CO LTDNIPPON HUME PIPE
    • SHIBATA TETSUYASUMURASE MASARUISHII YOSHIAKINAKAYAMA YOTARO
    • E03F1/00E03F5/04
    • PROBLEM TO BE SOLVED: To store rainwater even when an infiltration pipe is set in the ground of a geological feature having a slow infiltration speed of rainwater or the quantity of the rainwater flowing into the infiltration pipe is small, and enhance the infiltration efficiency by providing a weir for regulating the level of the water passing in an U-shaped open channel. SOLUTION: In an U-shaped open channel 1 forming an infiltration open channel to be set in the ground, an infiltration port 1b having a filter 2 for filtering rainwater is formed in a prescribed position of its side wall 1a, so that rainwater is infiltrated into the ground. A weir 3 lower by a prescribed dimension from a top board 1d is provided in the space by both side walls 1a and bottom board 1c of the U-shaped open channel 1 on the upstream or downstream end part inside of the U-shaped open channel 1. By providing the weir 3, the water passing in the box culvert 1 can be stopped and stored with the level being regulated to delay the outflow time of rainwater. Accordingly, even when the open channel is set in the ground of a geological feature having a slow infiltration speed, or the inflow quantity of rainwater is small, the rainwater can be stored to improve the infiltration efficiency.
    • 9. 发明专利
    • REINFORCED CONCRETE PIPE
    • JPH10132150A
    • 1998-05-22
    • JP28346396
    • 1996-10-25
    • NIPPON HUME PIPE
    • SAKAMURA HIROSHIISHII YOSHIAKI
    • F16L9/08
    • PROBLEM TO BE SOLVED: To attain high strength of a reinforcement cage by using a material formed by applying drawing processing to hot rolled steel material of a specific composition for lateral restricting reinforcement, and welding the lateral reinforcement with the vertical reinforcement in a particular condition in a pipe structure formed by embedding the reinforcement cage whose lateral restricting reinforcement is wound around the outside of the vertical reinforcement and whose contact part of the lateral restricting reinforcement and the vertical reinforcement is welded. SOLUTION: A lateral restricting reinforcement 2 in a reinforcement cage embedded in reinforced concrete 10 is formed out of hot rolled steel material to which drawing processing is applied, including elements obtained out of a group consisting of C: 0.05 to 0.22% (percent by weight), Si: 0.5 to 2.0%, Mn: 0.5 to 2.0%, P: 0.04% or lower, S: 0.04% or lower, Al: 0.080% or lower, N: 100ppm or lower, and residual part: Fe as main elements, and as other elements, Cr: 1.5% or lower, Mo: 1.0% or lower, Ti: 0.5% or lower, V: 0.5% or lower, B: 0.010% or lower, and Nb: 0.10% or lower. The lateral restricting reinforcement 2 and the vertical reinforcement 1 are welded in such conditions as voltage is 5 to 30V, welding time is 0.02 to 0.20 second and product of current and welding time is 140 to 1300.