Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 7, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • Technical Results of Construction on Urayama Dam
    Toshio JOUTATSU
    1997 Volume 7 Issue 3 Pages 140-152
    Published: September 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.140
    JOURNAL FREE ACCESS
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  • Hydraulic Load during Gate Operation
    Hiroshi TERATA
    1997 Volume 7 Issue 3 Pages 153-166
    Published: September 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.153
    JOURNAL FREE ACCESS
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    Hydraulic forces acting vertically on gate leaves installed in various hydraulic flow conditions were analyzed and systematized, followed by a proposal of manual computation method to get such hydraulic force for a new design without making model tests. This has been the first try ever seen because the hydraulic forces on both high pressure and open channel gates are put in a same frame which has a structure convenient to carry out the manual computation. Conditions to be satisfied by gate bottom shapes which have the least hydraulic force were clarified through analyzing the hydraulic force change based on idea of momentum change in water flow around the gates. Vectors of engineers who are engaged in the same type of study are supposed to have a direction to realize the manual comuputaion method which is applicable to wider range of gate conditions.
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  • Hydraulic Performance, Constructivity and Hydraulic Design of Circular Crests
    Naoto TSUNESUMI, Takashi KATO, Norio NAKANISHI, Hirohide KIRI
    1997 Volume 7 Issue 3 Pages 167-173
    Published: September 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.167
    JOURNAL FREE ACCESS
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    In this paper, we examined hydraulic performances of circular crests for easier consrtuction of a dam crest part. And we led the hydraulic design method of circular crests from the results of experiments. The results are summarized in the following. i) Weir coefficient of circular crests is given equation (1). The error of this equation is between ±3% on the condition that H/Lc>0.5 (H: head, Lc: Crest width). ii) Overflow water profile on circular crests with no piers is estimated accurately by equation (2). And highest water profile on circular crests with piers can be estimated by equation (6). iii) Negative pressure occurs on the circular parts of circular crests when head is high. But, excessive negative pressure can be prevented provided that L/H≥0.28 on the upstream circular part, R2/H≥(1.0-1.7) on the downstream circular part (H: head, L: Crest length of upstream circular part and flat top, : Radii of downstream circular part). On these condition, pressure on the downstream circular part is higher than -3.0mH2O when head is lower than about 10m.
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  • Grouting Measuring-System for Dam Foundation by Coriolis-type Mass Flowmeter
    Tsuguo ISHIDA, Kiyomi MIHASHI
    1997 Volume 7 Issue 3 Pages 174-179
    Published: September 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.174
    JOURNAL FREE ACCESS
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    This paper introduces the summary and the development process of a new grouting measuring system in dam foundation grouting, utilizing Mass Flowmeter which was adopted as a substitute for the conventional electro-magnetic flowmeter. Mass Flowmeter utilizes Coriolis-force which is one of apparent inertia force generated in the rotation coordinates, and in combination with pressure sensors, it is capable of measuring important factors in dam foundation grouting, such as pumping pressure, flow rate, and grout density very accurately, furthermore it is more compact than RI-type flowmeter which recently developed.
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  • New Style of Concrete Carriage Machine for Dam Construction
    Yoichi FUKUMOTO, Hiroshi SHIMADA, Shigemi SATO
    1997 Volume 7 Issue 3 Pages 180-190
    Published: September 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.180
    JOURNAL FREE ACCESS
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    Due to the proliferation of the full-layer placing method in dam construction, the choice of concrete transfer facilities is widening. In consideration of the situation, we have developed a new carriage machine. The concept of the new machine is to carry concrete from the foot of the dam, up the growing face, to the top. Compared to conventional facilities, this has the advantages of being more environmentally friendly, reducing cost and shortening period of temporary works, being more efficient, and being simpler to operate.
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