Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 13, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Development of Reliable Dam Concrete Production System Using Immersion Batching of Fine Aggregate
    Tetsuya MIYOSHI, Shigeyuki SOGO, Shigeyuki MIYAUCHI, Katsuya KAWASHIMA
    2003 Volume 13 Issue 2 Pages 70-78
    Published: June 15, 2003
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.11315/jsde1991.13.70
    JOURNAL FREE ACCESS
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    The key to the development of a reliable concrete production system and stabilization of batch qualities lies in accurate scaling and adjustment of the quantities of each ingredient. Changing surface moisture of sand has the greatest influence on concrete quality fluctuation, and it is difficult to precisely evaluate sand surface moisture with the present production system. To solve this problem, the authors have devised an “immersion batching” method for fine aggregate, in which aggregate is immersed in water before being batched in a wet condition. This paper shows the practical equipments of this new batching method, which applied to the concrete mixing batching plant for dam concrete on site, and the results of quality confirmation tests on concrete made using this method are reported.
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  • Structural Analysis and Computation of Natural Frequency for Shell Type Flap Gates
    Yukihiko UEDA, Kunihiro OGIHARA, Tatsubumi IGARASHI, Go KANAMORI
    2003 Volume 13 Issue 2 Pages 79-89
    Published: June 15, 2003
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.11315/jsde1991.13.79
    JOURNAL FREE ACCESS
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    The formulas for structural analysis on shell type flap gate are presented in many papers, but there are very few reports on the process of the analysis. It is very important to know this process for the gate design engineers to skill up his ability. In flap gate it is well known that the self-excited vibration occurs by binding the nappe oscillation and the condition for this vibration arise must be known before its construction. For this situation it is important to know the natural frequency of this gate. In this report, the process of theoretical analysis on shell type flap gate which is operated by one side or both sides, are shown and the results of the numerical calculation for this are presented also. And the method to derive the natural frequency and the virtual-mass of water moving with vibrating flap gate is proposed for analyzing the occurrence of gate vibration.
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  • Cost Analysis and Feasibility Study for PFI Project on Dam Sediment Recycling
    Michihiro OYA, Tetsuya SUMI, Masashi KAMON
    2003 Volume 13 Issue 2 Pages 90-106
    Published: June 15, 2003
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.11315/jsde1991.13.90
    JOURNAL FREE ACCESS
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    Removal and recycling of dam sediment by dredging or excavation are investigated. Although cost is one of the most important factors for dam sediment recycling, the analytical study related to the cost so far was limited to aggregates usage. We made cost analysis on dam sediment recycling including not only aggregate usage but also environmental aspect. Project feasibility of dam sediment recycling was also clarified applying the brand-new idea of PFI and risk management to this dam management field. Finally, we proposed the new project frame for dam sediment recycling jointly promoted by public sector and private sector based on the viewpoint of reservoir sedimentation management.
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  • Recycle of The Dehydrated Sludge on Construction for Growth Foundation
    Shigefumi IMASAKA, Toshiaki YASUI
    2003 Volume 13 Issue 2 Pages 107-116
    Published: June 15, 2003
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.11315/jsde1991.13.107
    JOURNAL FREE ACCESS
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    Recently, it is needed to recycle industrial waste on construction. The disposal of the dehydrated sludge and the cut tree are important problem in many construction site. So that, we tried to recycle them for growth foundation in our construction site. AS a result of some test executions, we were succeed in spraying the dehydrated sludge to slope efficiently. Further more, the chip of tree composted at construction site was mixed with the dehydrated sludge to improve quality of the growth foundation. We proved the quality of the growth foundation constructed by this method is equal to it of the usual methods after about one year. After this, we will observe this growth continuously to inspect the propriety of this methods.
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