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Volume 6 (1996)
- Issue 24 Pages 4-
- Issue 23 Pages 5-
- Issue 22 Pages 5-
- Issue 21 Pages 7-
Volume 6, Issue 24
Displaying 1-8 of 8 articles from this issue
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Choshiro TAMURA1996 Volume 6 Issue 24 Pages 4-23
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4974K) -
Isao NAGAYAMA, Takashi SASAKI1996 Volume 6 Issue 24 Pages 24-34
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the effects of the vertical acceleration of earthquakes on the stress in concrete gravity dams. The frequency response analysis and response spectrum analysis are used. The result of the analysis indicates that the 1st mode of vibration is dominant to the stress in the dams for horizontal acceleration and the 3rd mode of vibration is dominant for vertical acceleration. The muximum tensile stress induced by vertical acceleration is, however, much smaller than that induced by horizontal acceleration.View full abstractDownload PDF (2105K) -
Kenji IMAMURA, Aiko KIKUCHI, Tohru KANEKO, Kikuo KOGUCHI, Yoshiaki NOG ...1996 Volume 6 Issue 24 Pages 35-42
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSExperimental work to apply a slide type rubber seal of dam gates to high pressure region near 1 MPa is presented. Test rig was constructed from a model gate driven by a hydraulic piston and a rubber seal whose sectional dimension is same with a prototype. Dimensions of the model gate were 2m in width and 0.7m in sliding direction. Effort was made to reduce pinching the rubber into clearance between the gate and a member to fix the rubber in dam bed during the gate shutdown operation. Five types of the fixing member were examined to find-out small pinching. Test result shows that the examined slide type rubber seal and fixing member will work well in pressure region of 0.8-1.2 MPa without excessive stress condition.View full abstractDownload PDF (1610K) -
Kazutoshi ODA, Kouichi ENOKUMA, Moriyoshi KONDOU, Masanori ISHII, Akir ...1996 Volume 6 Issue 24 Pages 43-52
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe cable crane is often adopted as a way of transporting concrete in the construction of concrete gravity dams. The cable crane's placing capacity is highly dependent on the operator's skill, in combination with the work of the signalman. Improvement of construction capacity and safety is the first goal to accomplish, though the number of skilled operators and signalman is not enough these days. To solve this problem, we developed an automatic cable operating system, which makes positions and controls vibration at the same time. The cable crane is on end traveling type, with capacity of 14.5t. This report describes the outline of the automatic operating system and the results of actual field tests. These tests have confirmed the feasibility of this system.View full abstractDownload PDF (2810K) -
Akiyoshi SUZUKI, Gaku SAWADA, Kazuaki EZAWA, Kazumasa FUJIWARA1996 Volume 6 Issue 24 Pages 53-64
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis system has been developed in order to secure a stable working efficiency and safety in the process of dam concrete transportation and placing work. The system consists of three process, to feed concrete to a bucket by transfer car and to transfer a bucket by rope type cable crene automatically, and to discharge concrete at placing position manually. This system has been adopted to Tazawagawa Dam Project ordered by Yamagata Prefecture and got good result, and so this paper reports the outline of this system.View full abstractDownload PDF (2822K) -
Minoru HARADA, Hiroshi MORIMOTO, Tetsuya KOKUBO1996 Volume 6 Issue 24 Pages 65-73
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe have studied on bypass system which is extremely effective for the alleviation of sedimentation and prolonged period of water turbidity in reservoirs. The system aims to sluice not only turbid water (wash load) but also sediments (suspended load and bed load) past reservoir. It is demonstrated in this paper that a hydraulic characteristic and effectiveness of the system is clarified by a large-scale hydraulic model test.View full abstractDownload PDF (1480K) -
Toshio JOUTATU, Yasushi TANAKA, Satoyuki OHMAE1996 Volume 6 Issue 24 Pages 74-86
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn slopes created by large excavations of rocks, the release of in-situ stress caused by unloading provokes a rebound phenomenon on the surface of the excavation slope. This rebound phenomenon in the rock slopes has generally been described in qualitative terms and has rarely been measured quantitatively. We therefore attempted to quantitatively measure the rebound phenomenon in the rock slopes at the Urayama Dam as excavation progressed. Further, we measured the behavior of dam foundation rock as dam construction progressed. From these results, we checked up the safety of dam foundation rock. This report describes research on these behavior characteristics.View full abstractDownload PDF (2984K) -
Kunihiro OGIHARA, Yukihiko UEDA1996 Volume 6 Issue 24 Pages 87-94
Published: December 15, 1996
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1239K)
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