• 제목/요약/키워드: Strut-supporting wall

검색결과 17건 처리시간 0.031초

가설흙막이의 버팀대 선행하중량과 흙막이 벽체 변형등에 대한 분석

  • 김학청;정광렬
    • 기술발표회
    • /
    • 통권2006호
    • /
    • pp.35-44
    • /
    • 2006
  • Supporting method of a Temporary retaining wall for underground excavation project are adopted by systems of strut, anchor, nail, raker, etc. Strut system and Raker system of these methods are mostly used preloading jack to minimize deformations of retaining wall. We determinate efficient preloading to analysis these strut-preloadings, deformations of retaining wall, axial forces, and etc.. This study is analysed that preloading applied 0%, 10%, 20%, 30%, ...., 100% for strut and raker installed by CIP temporary retaining wall. This study results that adequate preloadings were determined to analysis correlations of preloading, deformations of wall, maximum bending moment, axial force of strut, and displacement of surrounding.

  • PDF

부분보강 엄지말뚝을 이용한 굴착시공방법의 수치해석적 타당성검토 (A Numerical Analysis of Excavation Method Using Partially Reinforced Soldier Pile)

  • 김준석;김주용;이승래
    • 한국지반공학회논문집
    • /
    • 제16권2호
    • /
    • pp.5-12
    • /
    • 2000
  • The hazard of excavation may be very high until a supporting system is completely installed. In this paper, an excavation method which uses partially reinforced soldier pile($\square$-shape) inserted by a short length steel bar was proposed and simulated by the finite element method. The reinforcing steel bar is moved down along the stage of excavation to reinforce the stiffness of the supporting system. The result of analysis showed that the risk of failure by bending moment or shear stress could be significantly reduced by the reinforcing effect of the steel bar. The proposed method could be applied to the strut-supporting wall or the diaphragm wall.

  • PDF

CFD를 이용한 풍동 시험 모델 지지대의 공력 특성 해석 (CFD Analysis of External Balance Strut Supporting Wind Tunnel Model)

  • 김철완;박영민;이장연
    • 한국전산유체공학회:학술대회논문집
    • /
    • 한국전산유체공학회 2003년도 추계 학술대회논문집
    • /
    • pp.102-105
    • /
    • 2003
  • The effect of the external balance strut on the wind tunnel model is investigated with simplified geometries. For this study, flat plate and elliptic wing are simulated with and without a cylinder. Pressure and wall shear stress distribution are analyzed to understand the effect of the cylinder.

  • PDF

장지간 깊은 굴착에서 지반변형 및 버팀보 축력변화 특성 사례연구(II) (Case Study of Characteristic of Ground Deformation and Strut Axial Force Change in Long Span Deep Excavation(II))

  • 김성욱;한병원
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2010년도 춘계 학술발표회
    • /
    • pp.248-259
    • /
    • 2010
  • In the case of relatively good ground and construction condition in the deep excavation for the construction of subway, railway, building etc., flexible earth retaining systems are often used in an economical point of view. It is generally known that the mechanism of behavior in the flexible earth retaining system is relatively more complicated than the rigid earth retaining system. Moreover in the case of long span strut supporting system the analysis of strut axial force change becomes more difficult when the differences of ground condition and excavation work progress on both sides of excavation section are added. When deeper excavation than the specification or installation delay of supporting system is done or change of ground condition is faced due to the construction conditions during construction process, lots of axial force can be induced in some struts and that can threaten the safety of construction. This paper introduces one example of long span deep excavation where struts and rock bolts were used as a supporting system with flexible wall structure. The characteristics of ground deformation and strut axial force change, the measured data obtained during construction process, were analysed, the effects of relatively deeper excavation than the specification on one excavation side and rapid drawdown of ground water level on the other excavation side were deeply investigated from the viewpoint of mutual influences between ground deformations of both excavation sides and strut axial force changes. The effort of this article aims to improve and develop the technique of design and construction in the coming projects having similar ground condition and supporting method.

  • PDF

장지간 깊은 굴착에서 지반변형 및 버팀보 축력변화 특성 사례연구(I) (Case Study of Characteristic of Ground Deformation and Strut Axial Force Change in Long Span Deep Excavation(I))

  • 김성욱;한병원
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2009년도 춘계 학술발표회
    • /
    • pp.308-319
    • /
    • 2009
  • In the case of relatively good ground and construction condition in the deep excavation for the construction of subway, railway, building etc., flexible earth retaining systems are often used in an economical point of view. It is generally known that the mechanism of behavior in the flexible earth retaining system is relatively more complicated than the rigid earth retaining system. Moreover in the case of long span strut supporting system the analysis of strut axial force change becomes more difficult when the differences of ground condition and excavation work progress on both sides of excavation section are added. When deeper excavation than the specification or installation delay of supporting system is done or change of ground condition is faced due to the construction conditions during construction process, lots of axial force can be induced in some struts and that can threaten the safety of construction. This paper introduces two examples of long span deep excavation where struts and rock bolts were used as a supporting system with flexible wall structure. And the sections of two examples are 50 meters apart in one construction site, they have almost similar design and construction conditions. The characteristics of ground deformation and strut axial force change were analysed, the similarity and difference between measurement results of tow examples were compared and investigated. The effort of this article aims to improve and develop the technique of design and construction in the coming projects having similar ground condition and supporting method.

  • PDF

장지간 깊은 굴착에서 지반변형 및 버팀보 축력변화 특성 사례 연구 (Case Study of the Characteristic of Ground Deformation and the Strut Axial Force Change in Long Span Deep Excavation)

  • 김성욱;한병원
    • 한국지반공학회논문집
    • /
    • 제26권7호
    • /
    • pp.171-186
    • /
    • 2010
  • 일반적으로 강성벽체에 비하여 연성벽체의 경우가 거동 mechanism이 상대적으로 복잡한 것으로 알려져 있으며 여기에다 버팀보 지지의 장지간인 경우 굴착단면 양쪽의 지반조건과 굴착공정의 차이가 부가되면 버팀보 축력변화 분석은 더욱 어렵게 된다. 시공과정에서 현장여건에 의한 과굴착이나 지보재의 설치지연, 지반조건의 변화 등이 발생 할 경우 특정 버팀보에 큰 축력이 발생하여 안전 시공을 위협하게 될 수 있다. 본 논문은 거의 유사한 지반조건, 굴착 및 지보조건을 갖는 동일현장의 약 50m 이격된 2개소의 버팀보 및 rock bolt 지지 장지간 연성벽체 깊은 굴착단면들의 시공과정에서 얻어진 계측결과인 지반변형 및 버팀보 축력변화 특성을 분석하고 2단면 계측결과의 유사성 및 차이점을 비교 고찰함으로써 향후 유사지반 및 동일공법 적용 project들의 설계, 시공과정에서 개선, 보완해야 할 사항 들을 제안하고자 한다.

고강도 강관파이프 스트러트 흙막이공법 사례연구 (Case Study of Braced Wall System with High-strength Steel Pipe Strut)

  • 신재민;박현영;주진규;신윤석;김광희
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2012년도 춘계 학술논문 발표대회
    • /
    • pp.19-20
    • /
    • 2012
  • According to develop urban area, the depth and floor area of basement tend to become deeper and larger. Excavation work for basement floor work is very important because its cost take 20% of total construction cost. Therefore, many studies of developing retaining wall system have performed for feasibility and safety in deep excavation work. In this study, new supporting system used high-strength pipe for retaining wall is introduced to reduce the construction cost and improve the safety and constructability by analyzing case study.

  • PDF

누두흉의 수술적 교정 (Surgical Repair of Pectus Excavatum)

  • 조덕곤
    • Journal of Chest Surgery
    • /
    • 제23권5호
    • /
    • pp.1027-1034
    • /
    • 1990
  • Pectus excavatum, commonest developmental anomaly of chest wall, is manifested by depression of the sternum and lower costal cartilages that is of surgical interest. From 1982 through 1990, fifteen patients have undergone surgery for treatment of pectus excavatum and treated by Ravitch operation: 5, Modified Ravitch operation; 4, Wada operation, 1 and Modified Wada operation, 5. There was familial history of pectus excavatum in 3 patients. Associated congenital anomaly were seen in 6 patients; scoliosis in 3 patients, right inguinal hernia in 1, polydactyly in 1 and patent ductus arteriosus in 1 patent. Postoperative minor complications were developed in 3 cases; pneumothorax, 2 cases; pleural effusion, 2 cases; wound infection and dehiscence, 1 cases; pressure sore due to strut malposition, 2 cases; flail chest and 2 cases; seroma. The incidence of the postoperative complications were more common in cases who were treated by metal strut, pin or other prosthetic materials for supporting the chest wall integrity than the standard corrective procedure. All cases have no recurrence of chest wall depression and operative death.

  • PDF

인접 구조물의 터파기로 인한 흙막이 벽체의 거동 분석 (Behavior Analysis of Earth Retaining Walls on the Excavation for Contact Structure)

  • 김영묵;정영수;홍창표;신윤섭
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2005년도 춘계 학술발표회 논문집
    • /
    • pp.1496-1503
    • /
    • 2005
  • The study on the lateral earth pressure is briskly preformed for various conditions such as type of retaining walls, ground condition, and type of supporting systems. It is not simple to determine the distribution of lateral earth pressure accurately, however, because the lateral earth pressure is affected by various factors. This study is performed to analyze the behavior of earth retaining walls for new excavation contacting with existing excavation by comparing with the site measuring values before and after new excavation. On the base of observation, the distribution of strut axial forces is similar to that of ganeral earth retaining walls, but strut axial forces is increased by removal of existing earth anchors. When new excavation is performed contacting with existing excavation, the axial force of strut is decreased because of soil exclusion in the behind walls, but that force is increased after new exeavation. The analysis result show that the installation of strut in middle part makes a effect to not only 1 adjacent strut, but 3-5 adjacent struts. Also during new excavation strut axial forces is decreased by relaxation of total earth retaining wall system.

  • PDF

Behavior of Continuous RC Deep Beams Supporting Bearing Walls

  • Lee, Han-Seon;Ko, Dong-Woo
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
    • /
    • pp.581-582
    • /
    • 2009
  • Continuous deep girders which transmit the gravity load from the upper wall to lower columns have frequently long end shear spans between the boundary of the upper wall and the face of the lower column. This paper presents the results of tests and analyses performed on three 1:2.5 scale specimens with long end shear spans, (the ratios of shear-span/height : 2.0