Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 49, Issue 2
Displaying 1-14 of 14 articles from this issue
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  • Application of Pressure Welding in Method of Prefabricated Deformed Bars
    J. Kadoriku, T. Yoshino, T. Sasaya
    2011 Volume 49 Issue 2 Pages 2_10-2_17
    Published: 2011
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.3151/coj.49.2_10
    JOURNAL FREE ACCESS
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    High-rise reinforced concrete buildings have increased, and in these construction sites we have used the method of prefabricated deformed bars. We thought pressure welding was not suit in the method of prefabricated deformed bars, but performance of pressure welding machine has improved. Recently we can use pressure welding in the method of prefabricated deformed bars. Several cases of pressure welding in the method of prefabricated deformed bars and demonstrated test of general column and beam are presented in this paper.
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  • Super thin-type Flat Jack
    J. Akama, T. Kato, M. Nakamura
    2011 Volume 49 Issue 2 Pages 2_18-2_24
    Published: 2011
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.3151/coj.49.2_18
    JOURNAL FREE ACCESS
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    The super thin-type Flat Jack was invented in 1938 by Dr. Eugene Freyssinet, who is the ancestor of the pre-stressed concrete (PC) technology, and it has been still now world-widely used since 70 years ago. Its structure is a deformable steel vessel made out of two thin steel plates, both of which are troughed at their peripheries and which edges are joined together by welding. At the external edge, two holes for hydraulic injection and air outlet are arranged. The principle is as follows; when a hydraulic pressure is applied from an injection whole, both faces of the jack are deformed separately to yield lifting power. Its special features and advantages are applicable at narrow spaces because of the thin jack, no breakdown due to a simple structure, light-weight and low cost. This is applied as a support and for movement of heavy structures, and also adjustment of structures deformed by concrete creep. And recently, the cases of applying for replacement of bridge shoes and for installation of the seismic control devices to the buildings are increasing. From now on, it is expected that any practical usages in the fields of designing and construction planning of structures are developed based on any novel ideas to utilize unique feature of the Flat Jack.
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