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http://dx.doi.org/10.12791/KSBEC.2017.26.1.27

Evaluation of Structural Stability of Plastic Greenhouses with Steel Spiral Piles on Reclaimed Lands  

Yum, Sung Hyun (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
Lee, Won Bok (Sungbo E&T)
Publication Information
Journal of Bio-Environment Control / v.26, no.1, 2017 , pp. 27-34 More about this Journal
Abstract
This study was carried out to estimate structural stabilities in respect of ground footings of plastic greenhouses on reclaimed lands. A 6m-wide multi-span plastic greenhouse with steel spiral piles as well as two 8.2m-wide single-span greenhouses with steel spiral piles and continuous pipe foundation respectively were built up on a reclaimed land with a SPT N-Value of 2 and measured how much the greenhouses were lifted up and subsided. In addition, the uplift capacity of three kinds of spiral piles(${\phi}50$, ${\phi}75$ and ${\phi}100$) was determined on a nearby reclaimed land. The results showed that the greenhouses with spiral piles had a slight vertical displacement like moving up and down but the scales of the rising up and sinking were negligible when compared to that of the greenhouses. The vertical displacement of the multi-span greenhouse ranged from +9.0mm(uplift) to -11.5mm(subsidence). As for the single-span greenhouses with spiral piles and continuous pipe foundation, the measurements showed that it varied from +1.3mm to -7.7mm and from +0.9mm to -11.2mm, respectively. The allowable uplift capacity of spiral piles could all be determined under criteria of ultimate load and accordingly had a value of 0.40kN, 1.0kN and 2.5kN, respectively. It was not entirely certain enough to make a final judgement on structural stabilities in respect of ground footings, it appeared likely however that the greenhouses with steel spiral piles was tentatively observed without any problems on reclaimed lands within the period.
Keywords
ground footing; uplift capacity; vertical displacement;
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Times Cited By KSCI : 2  (Citation Analysis)
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