• KIEAE Journal
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• 제8권1호
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• pp.87-92
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• 2008

Sheathing work used for excavation in a crowded downtown is generally a temporary strut method using H-piles and sheathing wall includes lagging, CIP, SCW or slurry wall. A temporary strut serving the support for sheathing wall acts to resist the earth pressure, but it shall be removed when installing the underground structure members. A traditional temporary strut might cause the stress imbalance of the sheathing wall when it is demolished, resulting in time extension and the risk of collapse. A traditional temporary strut method thus needs to be improved for schedule and cost reduction, risk mitigation and for preparation for potential civic complaint. A permanent strut method doesn't require installing and demolishing the temporary structure that will lead to reducing the time and cost and the structural risk during the demolition process. And given the girder, the part of the underground structure, serves the role of strut, it can secure the wider interval compared to the traditional method, which enables to secure the wider space for the convenience of excavation as well as enhance the constructability and efficient site management. The thesis was intended to study the composite girder designed to use the strut as permanent structure so as to reduce the excavation and floor height.

• 한국건설관리학회논문집
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• 제9권5호
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• pp.186-193
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• 2008

흙막이를 지지하는 버팀대를 가설재가 아닌 주(主)구조체로 이용하는 SPS(Strut as a Permanent System) 공법이 개발되어 최근 국내 공사현장에서 활발하게 활용되고 있다. 이 공법은 건축공사 현장에서 원가절감, 공기단축, 구조적 안정성 향상, 건설환경 개선 등 다양한 이점을 주는 반면 지하층고의 증가와 철골부위 내화피복을 추가로 수행하여야 하는 문제점이 있다. 지하층고의 증가는 흙막이 깊이 및 지하 최저부위 굴착량 증가의 문제점을 유발하고, 내화피복 공사는 공사환경을 열악하게 함은 물론 공사비 증대의 요인이 된다. 따라서 본 연구는 SPS 공법의 문제점을 개선한 모듈화된 철골철근 복합 구조시스템(modularized hybrid structure system)을 제안하는 것을 목적으로 한다. 제안된 공법은 구성원리와 함께 실험을 통하여 구조적 성능을 검증되고 다양한 공사조건을 만족시키는 시공성능이 분석된다.

• 건축구조
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• 제12권5호
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• pp.68-75
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• 2005

• 기술발표회
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• 통권2006호
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• pp.54-65
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• 2006

Since timbering of a cut in association with underground excavtion work is introduced to domestic, in spite of limitation of special quality in this method, time change, variety of construction, Strut Method is still considered with general methods. Experts have developed methods which is improved in limitation of special quality by continuous studies of normal strut method in basic, and it has been applied to construction site Consequently, this study introduced improved Strut Method to help experts when they select resonable methods with regard to construction site, conditions

• 한국건설관리학회논문집
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• 제5권3호
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• pp.71-78
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• 2004

In conventional method of supporting soil shuttering wall during excavation a system of struts and wales to provide cross-lot bracing is common in trench excavations and other excavations of limited width. This method, however, becomes difficult and costly to be adopted for large excavations since heavily braced structural systems are required. Another expensive and unsafe situations are expected when temporary struts must be removed for the construction of underground structures. This paper introduces innovative strut systems which can be used as permanent underground structures after its role as brace system to resist earth pressure during excavation phase. Underground structural system suggested from architect is checked against the soil lated pressures before the analysis of stresses developed from gravity loads. In this technology, named SPS(Struts as Permanent System), retaining wall is installed first and excavation proceeds until the first level of bracing is reached. Braces used as struts during excavation will serve as permanent girders when buildings are in operation. Simultaneous construction of underground and superstructure can proceeds when excavation ends with the last level of braces being installed. In this paper, construction sequence and the calculation concept are explained in detail with some photo illustrations. SPS technology was applied to three selected buildings. One of them was completed and two others are being constructed Many sensors were installed to monitor the behavior of retaining wall, braces as column in terms of stress change and displacement. Adjacent ground movement was also obtained. These projects demonstrate that SPS technology contributes to the speed as well as the economy involved in construction.

• 한국지반환경공학회 논문집
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• 제18권2호
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• pp.5-19
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• 2017

국내 건축물 시공을 위한 지하 굴착은 안정성, 경제성 및 굴착 주변 여건 등을 고려하여 재래식 버팀대 공법(Strut, Ground Anchor)에서 점차 Top-Down 공법을 개량한 내부 영구 지지체 공법으로 변화하고 있다. 본 연구에서는 국내에서 범용적으로 사용되고 Top-Down 공법, New Top-Down 공법, S.P.S 공법, S.T.D 공법 및 B.R.D 공법 등 내부 영구 지지체 공법 현장을 선정하여 재래식 버팀대 공법과 공사비 및 공기를 비교 분석하였다. 또한 공사 중 흙막이 벽체의 계측 자료를 분석하여 흙막이 벽체의 안정성을 확인하였다. 그 결과 깊은 굴착 및 기반암층이 지표면으로부터 가까운 경우 영구 지지체 공법이 재래식 버팀대 공법보다 경제성과 시공성이 우수함을 알 수 있었다

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 1부
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• pp.197-199
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• 2011

To utilize the Top-Down construction method, it is required to analyse building area, floors, and soil conditions to choose the three basic elements of retaining wall, base column, and floor structure. The purpose of this research is to compare the methods of Top-Down with other construction methods. The research method is to analyse the project conditions of Top-Down project cases. The aim is to develop a method of selecting alternatives, considering construction characteristics, work schedule, supporting methods, foundation types.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.189-192
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• 2012

Underground structure construction in the downtown is very difficult despite the development of construction technology. We have been a lot of research in order to solve the problem, it was a remarkable achievement. But there are still many difficulties. This study is to analyze the construction technology to demolish the existing underground structures and to build new building applied topdown method at the same time. This technology was effective to suppress interference between the exsisting structure and new building. Therefore, this technology is expected to be able to be used in similar cases in the future.