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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
New Rectangular-like Columns: Advanced Swing Jet Grouting Test and Quality Confirmation
Author(s)
Tsutomu Tsuchiya, Hiroyuki Abe and Kazuhiko Komatsu
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DOI:10.17265/1934-7359/2018.03.004
Affiliation(s)
Chemical Grouting Co., Ltd., Tokyo 105-0001, Japan
ABSTRACT
Ordinary columns of jet grouting are circular or fan-shaped. But in
recent years, such shapes as candy-shaped columns were put to practical use.
They are constructed by switching the rotational speed of the stem in one
rotation. We applied this method to swing jet grouting. That is, we changed the
rotational speeds in the swing jet grouting to make elongated columns near
rectangle. The test construction was succeeded and the columns’ shapes conformed to
those designed. In addition, the quality was confirmed to be as good as
ordinary columns. Radii (distances from center to outer ends) were 1.03 to 1.21
times as large as those designed. Improvement ratios were 95% or more in any
position. Strengths were varied by location, but they satisfied design strength
1.5 kN/m2 at any position. We concluded that this new column can be applied to
practice in the same way as ordinary columns.
KEYWORDS
Swing jet grouting, rectangular-like column, flexible shape, efficiency.
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