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2014 Vol.23, Issue 2
Uplift Bearing Capacity of Spiral Steel Peg for the Single Span Greenhouse

온실용 나선철항의 인발저항력 검토

Bong Guk Lee1
,
Sung Wook Yun2
,
Man Kwon Choi2
,
Si Young Lee4
,
Sung Dong Moon5
,
Chan Yu3
,
Yong Cheol Yoon3*
이 봉국1
,
윤 성욱2
,
최 만권2
,
이 시영4
,
문 선동5
,
유 찬3
,
윤 용철3*
1Graduate school, Gyeongsang National Univ., Jinju 660-701, Korea
2Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 660-701, Korea
3Dept. of Agricultural Eng., Gyeongsang National Univ.(Institute of Agriculture and Life Science), Jinju 660-701, Korea
4Dept. of Agricultural Engineering, National Academy of Agricultural Science, RDA, Suwon 441-707, Korea
5Dept. of Industrial & Management Eng. Kangwon National University, Samcheok 245-711, Korea
1경상대학교 대학원
2경상대학교 농업생명과학연구원
3경상대학교 지역환경기반공학과(농업생명과학연구원)
4농촌진흥청 농업공학부 에너지환경공학과
5강원대학교 산업공학과
*Corresponding Author : ychyoon@gnu.ac.kr
30 April 2014. pp. 109-115
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Abstract

This study examined the uplift bearing capacity of spiral steel pegs according to the degree of soil compaction and embedded depth in a small-scaled lab test. As a result, their uplift bearing capacity increased according to the degree of soil compaction and embedded depth. The uplift bearing capacity under the ground condition of 85% compaction rate especially recorded 48.9 kgf, 57.9 kgf, 86.2 kgf and 116.6 kgf at embedded depth of 25 cm, 30 cm, 35 cm and 40 cm, respectively, being considerably higher than under other ground conditions. There were huge differences in the uplift bearing capacity of spiral steel pegs according to the compaction conditions of ground. Their maximum uplift bearing capacity was 116.6 kgf under the ground condition of 85% compaction rate and at embedded depth of 40 cm, and it is very high considering the data of spiral steel pegs. It is thus estimated that wind damage can be effectively reduced by careful maintenance of ground condition surrounding spiral steel pegs. In addition, spiral steel pegs will be able to make a contribution to greenhouse structural stability if proper installation methods are provided including the number and interval according to the types of greenhouse as well as fixation of plastic film. The findings of the study indicate that the optimal effects of spiral steel pegs for greenhouse can be achieved at embedded depth of more than 35cm and compaction degree of more than 85%. The relative density of the model ground in the test was 67% at compaction rate of 85%.

Keywords
disaster
embedment depth
compaction rate
small-scaled lab. test
soil box

본 연구에서는 모형실험을 통하여 다짐도 및 매입깊이 에 따른 나선철항의 인발저항력을 검토하였다. 그 결과 다짐도 및 매입깊이가 증가할수록 인발저항력은 증가하 는 것으로 나타났으며, 특히 다짐률 85%의 지반조건에 서 인발저항력은 매입깊이 25cm, 30cm, 35cm 및 40cm 별로 각각 48.9kgf, 57.9kgf, 86.2kgf 및 116.6kgf로 다른 지반조건일 때 보다 현저하게 높은 인발저항력이 나타났 다. 그리고 다짐률에 따른 인발저항력은 각 매입깊이 조 건별(30cm, 35cm 및 40cm)로 다짐률 75% 및 85%에서 급격하게 증가하는 유사한 경향이 나타났다.

나선철항의 인발저항력은 지반의 다짐률에 따라 상당 한 차이를 보였으며 극한인발저항력의 최대값은 다짐률 85%의 지반조건 및 매입깊이 40cm에서 116.6kgf로 나 타났다. 이는 나선철항의 제원을 고려해 볼 때 매우 높 은 것으로 판단된다. 따라서 평소 나선철항 주변 지반의 유지관리를 철저히 한다면 바람에 대한 피해를 효과적으 로 경감시켜 줄 수 있을 것으로 판단된다. 그리고 나선 철항은 플라스틱 필름을 고정하는 용도뿐만 아니라 온실 형태별로 개수 및 간격 등 적절한 설치방법이 제시된다 면 온실의 구조적 안정성에도 기여를 할 수 있을 것으 로 예상된다.

또한 본 연구의 결과를 검토해 볼 때 온실에 나선설항 의 설치시 유용한 효과를 기대하기 위해서는 매입깊이 35cm 이상 그리고 다짐률은 85%이상을 적용해야 할 것 으로 판단되며, 본 실험에서 다짐률 85%에 해당하는 모 형지반의 상대밀도는 67%정도 였다.

키워드
다짐률
매입깊이
모형실험
자연재해
토조
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Protected Horticulture and Plant Factory
  • Journal Title(Ko) :시설원예ㆍ식물공장
  • Volume : 23
  • No :2
  • Pages :109-115
  • Received Date : 2014-03-26
  • Revised Date : 2014-04-14
  • Accepted Date : 2014-06-03
  • DOI :https://doi.org/10.12791/KSBEC.2014.23.2.109
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