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Effect of Joint Reinforcement on Reinforced Concrete Pile by Centrifugal Casting

원심성형 철근콘크리트 말뚝 이음부의 보강 효과

  • 주상훈 (한국도로협회 기술연구센터) ;
  • 황훈희 (한국도로협회 기술연구센터)
  • Received : 2019.08.16
  • Accepted : 2019.11.01
  • Published : 2019.11.30

Abstract

The construction of foundation piles for buildings and bridges is changing from pile driving to an injected precast pile method. The goal is to minimize environmental damage, noise pollution, and complaints from neighboring residents. However, it is necessary to develop economic piles that are optimized for precasting by a centrifugal method in terms of both the material and structural system. A reinforced joint method is proposed for reinforced concrete piles (RC piles) manufactured by centrifugal casting. A previous study concluded that the structural performance of the current joint system for RC piles could be improved by using a reinforced joint composed of extended circular band plates and studs. In this study, the structural performance of such a joint was validated experimentally by bending and shear strength measurements. The proposed joint reinforcement method showed adequate structural performance in terms of bending and shear strength. The overall load-deflection behavior is close to that of a structure without joints, so it is expected that the behavior and performance of the design can be reliably reflected in site structures.

최근 건축과 토목 구조물 기초에 적용되는 말뚝의 시공법은 환경 훼손, 소음 공해, 그리고 주위 민원을 최소화하기 위해 항타공법에서 매입공법 위주로 변화하는 추세를 보이고 있다. 이러한 시공방법의 변화로 인해 기존의 항타공법으로 사용되었던 말뚝 대신, 재료 및 구조적인 시스템 측면에서 보다 최적화되고 경제적인 매입용 말뚝의 개발이 요구되고 있다. 본 연구에서는 매입용 말뚝인 원심성형 철근콘크리트 말뚝의 보강된 이음방법을 제안하였다. 이전의 연구에서는 원심성형 철근콘크리트 말뚝에 대해 연장된 원형띠판과 스터드로 구성된 이음 보강방법이 기존 이음방법의 구조성능을 개선 시킬 수 있을 것으로 검토되었다. 따라서, 본 연구에서는 이러한 이음방법의 구조성능을 말뚝의 휨과 전단 강도 실험을 통해 검증하였다. 이 제안된 이음방법은 설계에서 요구되는 휨과 전단 강도에 대해 충분한 성능을 보인 것으로 실험에서 나타났다. 또한, 전반적인 하중-처짐 거동이 이음부가 없는 일체형 구조에 근접하므로 설계에서 예상하는 거동과 성능이 안정적으로 현장 구조물에 반영될 수 있을 것으로 기대된다.

Keywords

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