플라스틱 온실의 폭설피해 방지를 위한 가지주 장치 개발

Development of a Temporary Pole Supporting System to Protect the Plastic Greenhouses from Heavy Snow Damage

  • 남상운 (충남대학교 농업생명과학대학)
  • 발행 : 2002.07.30

초록

The pipe framed and arch shape plastic greenhouse, which is the most popular greenhouse in Korea, is relatively weak in snowdrift. Reinforcement of rigid frame or column is required to reduce the damage from heavy snow in this type. But additional rigid frames or columns decrease light transmissivity or workability, and increase construction cost. So it is desirable to prepare some temporary poles and to install them when the warning of heavy snow is announced. This study was carried out to develop the temporary pole supporting system using galvanized steel pipes for plastic housing and to evaluate the safe snow load on a temporary pole. A pipe connector, which is inserted in the top of pipe used in the temporary pole and supports the center purline, was designed and manufactured to be able to carry the upper loads safely. And a bearing plate was safely designed and manufactured in order to carry the loads acting on it to the ground. When temporary poles of ${\phi}$ 25 pipe are installed at 2.4m interval, it shows that the single span plastic greenhouses with 5~7 m width are able to support the additional snow depth of 13.9~25.3 cm beyond the snow load supported by main frame.

키워드

참고문헌

  1. Architectural Institute of Korea. 1995. Design Standard and Explanation of Steel Pipe Structure. Girmndang press. Seoul. p.39-146. (in Korean)
  2. Japan Greenhouse Horticulture Association. 1999. Structural Safety Guide of Pipe Houses with Ground Anchoring. pp.57. (in Japanese)
  3. Kim, M. K. and S. W. Nam. 1995. Experimental studies on the structural safety of pipe houses. J. Bio. Fac. Env. 4(1): 17-24. (in Korean)
  4. Lee, H. W. and S. K. Lee. 1995. A study on the safety frame interval of pipe houses in Kyungpook region. J. Bio. Fac. Env. 4(2): 195-202. (in Korean)
  5. Midwest Plan Service. 1983. Structures and Environment Handbook. 409 Structural steel design. p.1-25
  6. Nam, S. W. 2000. A study on the standard durable years of pipe framed greenhouses. Journal of the KSAE 43(1) : 96-101. (in Korean)
  7. Nam, S. W.. I. H. Yu and J. W. Kim. 2001. Maintenance, repair and reinforcement of pipe framed greenhouses. Seoul. Ministry of Agriculture and Forestry. p.108-134. (in Korean)
  8. Nam, S. W.. M. K. Kim and I. H. Yu. 2000. Field survey and structural safety analysis of pipe framed greenhouses. Proceedings of the KSAE annual conference. p.315-320
  9. National Disaster Prevention and Countermeasures Headquarters. 2001. Repair work plan for heavy snow damage. (in Korean)
  10. Ogawa, H., I. Tsuge, Y. Sato, S. Hoshiba and S. Yamashita. 1989. Experimental analysis on strength of pipe houses with ground anchoring. J. of Agricultural Structures. Japan. 19(3): 173-182
  11. Timoshenko, S. and D.H. Young. 1982. Elements of Strength of Materials. Munoondang press. Seoul. p.284-296. (translated in Korean)
  12. Whitaker, J.H. 1979. Agricultural Buildings and Structures. Reston Publishing Company. p.153-168