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2013 Vol.29, Issue 10
Analysis of Characteristics of Connected-pile Foundations for Transmission Tower according to Changes of Load and Connection Beam Conditions in Clay

점토지반에서 하중특성 및 연결보조건에 따른 송전철탑용 연결형 말뚝기초의 특성 분석

Doohyun Kyung1
,
Junhwan Lee2
,
Kyuho Paik3
,
Youngjun Kim4
,
Daehong Kim5
경 두현1
,
이 준환2
,
백 규호3
,
김 영준4
,
김 대홍5
1Ph.D Candidate, School of civil and Environmental Engrg., Yonsei Univ.
2Prof., School of Civil and Environmental Engrg., Yonsei Univ.
3Prof., Department of Civil Engrg., Kwandong Univ.
4Graduate Student, Department of Civil Engrg., Kwandong Univ.
5Principal Researcher, KEPRI/KEPCO
1연세대학교 토목공학과 박사과정
2연세대학교 토목공학과 교수
3관동대학교 토목공학과 교수
4관동대학교 토목공학과 석사과정
5한국전력공사 전력연구원 책임연구원
교신저자. Corresponding Author. 
31 October 2013. pp. 5-18
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Abstract

The differential settlement between the foundations causes the critical damage on the transmission tower constructed in soft ground. Connected-pile foundation for transmission tower structures is an option to prevent the differential settlement. It consists of main foundations and connection beams that are placed between the individual foundations at each corner of tower. In this study, 24 model pile load tests were conducted at a construction site in jeonlabuk-do to investigate the effects of the connection beams on transmission tower foundation. In model tests, various load conditions and connection beam conditions were considered. As the test results, the displacements of connected-pile foundation differed in accordance with load directions. The settlements of connected-pile foundation decreased with the increased stiffness of connection beams, lateral load capacity decreased in accordance with load height, and the lateral load capacity on the failure criteria was similar regardless of load direction.

Keywords
Clay
Connected-pile foundation
Lateral behavior
Model test
Transmission tower

부등침하는 연약지반에 시공되는 철탑기초에 있어서 주요한 손상을 야기한다. 송전철탑용 연결형 말뚝기초는 연약지반에서의 송전철탑기초의 부등침하를 방지하기 위한 구조물로서, 주기초체와 주기초체 사이에 위치하여 기초를 연결하는 연결보로 구성된다. 본 연구에서는 송전용 철탑기초에 작용하는 연결보의 영향을 조사하기 위하여, 전라북도에 위치한 건설현장에서 24회의 모형재하시험을 수행하였다. 시험에서는 다양한 하중조건과 연결보 조건이 고려되었으며, 시험결과 수평하중에 의한 연결형 말뚝기초의 발생변위가 철탑에 작용하는 수평하중의 각도에 따라 달라지는 것으로 나타났다. 연결형 기초의 침하는 연결보의 강성이 증가할수록 감소하였으며, 수평지지력은 수평하중이 재하되는 철탑의 높이가 낮을수록 증가하였고, 파괴시점에서의 하중의 크기는 대부분의 경우 하중재하방향에 상관없이 유사한 것으로 나타났다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :10
  • Pages :5-18
  • Received Date : 2011-02-18
  • Revised Date : 2011-07-12
  • Accepted Date : 2013-09-23
  • DOI :https://doi.org/10.7843/kgs.2013.29.10.5
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