Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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  • Toyohiro MAEDA, Yoichiro KUROHA, Norimasa KOSUGA, Saburo KATAYAMA
    2021 Volume 31 Issue 2 Pages 181-188
    Published: September 15, 2021
    Released: September 23, 2021
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    The Kabagawa Dam is a concrete gravity dam with a bank volume of 430,000 m3 located in Shionoe-cho, Takamatsu City, Kagawa Prefecture. Due to restrictions on this dam, nighttime construction was restricted, so it was not possible to construct it continuously for 24 hours like normal dam construction. Therefore, there was a concern that the casting speed would decrease due to the increase in work due to the interruption of work in the dam casting, so it became an issue to improve the construction efficiency and productivity. Therefore, we adopted the cruise RCD method and utilized ICT to improve the efficiency of construction. The latter ICT utilization aims to improve productivity by making concrete placement management online and visualizing the site situation with a cloud camera.

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  • Takatsuna NAKANO, Ryoiti KUWANO
    2021 Volume 31 Issue 2 Pages 189-199
    Published: September 15, 2021
    Released: September 23, 2021
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    Flood Mitigation dam is a type of dam that stores only during floods. It is generally considered advantageous to construct a dam in a V-shaped valley. In addition, Flood Mitigation dam install spillways near the riverbed, so spillways are close to each other in tight spaces. Therefore, Flood Mitigation dam, in addition to the usual suppression of mass concrete temperature cracks, it was important to suppress cracks due to the concentration of spillways. This report is described for cracking measures and effect focusing on the spillway.

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  • Chikashi OHTA, Takahiro MORITA, Atsushi TOKUNAGA
    2021 Volume 31 Issue 2 Pages 200-211
    Published: September 15, 2021
    Released: September 23, 2021
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    Senbon Dam reinforcement work is a seismic retrofitting of the Senbon Dam, which was built about 100 years ago and is a dedicated water supply dam, using Prestressed Dam-use Anchors method, which is the first construction in Japan. In the seismic retrofitting work of gravity type concrete dams, a thickening method is generally used to add new concrete to the upstream and downstream of the dam body, but a method that does not affect the appearance and allows the dam to be used during construction was applied. We will report on the technical issues of Prestressed Dam-use Anchors construction method and the countermeasures aimed at ensuring quality and process.

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  • Saburo KATAYAMA, Hyogo OTA, Takayuki ISHII, Shunichi HATAKEYAMA
    2021 Volume 31 Issue 2 Pages 212-223
    Published: September 15, 2021
    Released: September 23, 2021
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    In the industrial world including the construction industry, the labor environment is remarkably changing, for example, the revised Labor Standards Law is applied to the construction industry in 2024, while the decrease of the labor population advances, and solution of the labor shortage and productivity improvement become very important problems. Recently, as represented by Society 5.0 and the Ministry of Land, Infrastructure, Transport and Tourism's “Promotion of DX in the Infrastructure Field”, the introduction of Cyber-Physical Systems (CPS), which visualizes and automates data utilization, has been promoted to solve social problems. This paper is a “T-i Digital Field” aiming at productivity improvement based on the concept of CPS, which was introduced at a concrete dam site and verified the productivity improvement effect.

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