• 제목/요약/키워드: Precast Box

검색결과 66건 처리시간 0.022초

Front-Jacking공법에 의한 대전역사 하부 관통사례 (A case study on perforation under Daejeon station building by Front-Jacking method)

  • 김용일;황낙연;정두석;차종휘;이내용
    • 한국암반공학회:학술대회논문집
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    • 한국암반공학회 2006년도 춘계학술발표회 논문집
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    • pp.195-203
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    • 2006
  • 철도지하횡단공사는 횡단구조물 축조시 개착식과 비개착식 공법으로 구별되는데 개착식 공법은 열차의 비운행시간을 고려하여 시공하는 극히 제한적인 공법인데 반하여 비개착식은 열차의 속도 및 운행시간에 제약을 받지 않는 특징을 갖고 있으며 안전하고 신속한 시공의 장점을 갖고 있다. 비개착식 공법 중 Front Jacking 공법은 소구경의 강관을 압입하여 구조물과의 마찰력과 토압을 최소화시킨 후 현장에서 제작한 전단면 Precast Box 선단부에 PC강연선과 유압Jack을 이용하여 박스를 지중에 견인하는 공법으로 시공시 안정성과 열차의 정시성 확보가 유리하여 많이 적용되고 있다. 이 공법은 박스단면의 크기 및 연장, 지반조건에 관계없이 시공가능하며 친환경적인 시공을 할 수 있다. 본 고에서는 Front Jacking 공법이 적용된 대전동서관통대로의 철도횡단 시공사례를 소개하고자 한다.

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P.C 박스거더교의 횡단면 최적설계에 관한 연구 (A Study on tile Cross Section Optimization of P.C Box-Girder Bridge)

  • 방명석;김일곤;조현준
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 1990년도 가을 학술발표회 논문집
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    • pp.101-104
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    • 1990
  • The program which could determine cross-sectional dimensions of the box girder bridge at tile stage of preliminary design was developed using the optimal technique in this study. It could minimize the cost and time required in the design of box girder bridges and the construction with the prestressed precast segmental method. Objective cost function consisted of four independent variables such as widths and depth of the cross-section. The Nelder-Mead method was used to solve the nonconstrained nonlinear problem like this.

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P.C 대형판넬 부분구조물의 Quasi-Static 실험연구 (Quasi-Static Test of Precast Concrete Large Panel Subassemblage)

  • 최정수;이한선;김우;홍갑표
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1990년도 가을 학술발표회 논문집
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    • pp.73-78
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    • 1990
  • Large panel building systems are composed of vertical wall panels which support horizontal roof and floor panels to form a box like structure. The simplecity of the connections, which makes precast concrete economically viable, causes a lack of continuity in stiffness, strength and ductility. This precast concrete large panel systems typically have weak connection regions. Three types of 2-story full-scale precast concrete subassemblages were tested under reversed cyclic loading. The seismic resistance capacity and failure mode of each system are compared in connection with the characteristics of joint connection details.

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Flexural Behavior of Continuous Composite Bridges with Precast Concrete Decks

  • Chung, Chul-Hun
    • 콘크리트학회논문집
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    • 제15권4호
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    • pp.625-633
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    • 2003
  • For the construction of open-topped steel box girder bridges, prefabricated concrete slab could offer several advantages over cast-in-situ deck including good quality control, fast construction, and elimination of the formwork for concrete slab casting. However, precast decks without reinforcements at transverse joints between precast slabs should be designed to prevent the initiation of cracking at the joints, because the performance of the joint is especially crucial for the integrity of a structural system. Several prestressing methods are available to introduce proper compression at the joints, such as internal tendons, external tendons and support lowering after shear connection. In this paper, experimental results from a continuous composite bridge model with precast decks are presented. Internal tendons and external tendons were used to prevent cracking at the joints. Judging from the tests, precast decks in negative moment regions have the whole contribution to the flexural stiffness of composite section under service loads if appropriate prestressing is introduced. The validity of the calculation of a cracking load fur serviceability was presented by comparing an observed cracking load and the calculated value. Flexural behavior of the continuous composite beam with external prestressing before and after cracking was discussed by using the deflection and strain data.

스트럿 타이 모델을 이용한 프리캐스터 프리스트레스 콘크리트 세그멘탈 박스 거더 교량의 신축이음 세그멘트이 설계기법 연구 (Design of Expansion Segment of Precast Prestressed Concrete Segmental Box Girder bridges Using Strut and Tie Model)

  • 오병환;이형준;김익현;한승환
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1995년도 봄 학술발표회 논문집
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    • pp.268-273
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    • 1995
  • In recent years, precast prestressed concrete segmental box girder bridges have been increasingly constructed Expansion disphragm segment of this type bridge transfers forces from the superstructure onto bearing or column, and plays an important roll of anchorage zone for longitudinal prestressed forces. Non-linear stresses occur inside of diaphragms by these extensive concentrated forces. In this study, the strut-and-tie models are proposed to design an expansion segment rationally. A formula to determine the effective transverse prestressed forces is proposed on the basis of these models. The present study is expected to provide an effective tool to design expansion segment of prestressed concrete bridges rationally.

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국내 최장 개구제형 합성형교 시공 (Construction of the longest open toped steel box girder composite bridge in the country)

  • 오현철;마향욱;김인규;김영진;장승균
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
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    • pp.165-166
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    • 2009
  • 이 논문은 프리캐스트 콘크리트 바닥판을 적용한 국내 최장 개구제형 강박스 거더교 시공에 관한 연구이다. 개구제형 강박스 거더 교량은 기존 폐합형 강박스 교량에 비해 강재량을 절감하여 경제적인 설계가 가능하며, 프리캐스트 바닥판을 적용함으로서 교량의 공사기간을 6개월 이상 단축할 수 있다. 본고에서는 국내최장 개구제형 교량인 영덕-오산간 광역화 도로공사 구간의 서천교의 시공사례를 소개하고자 한다.

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신형식 V형 거더 교량의 동적안정석 해석 (Dynamic Analysis of New-type Precast V-girder Bridge)

  • 조정래;김영진;양연종;구자갑
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.1536-1541
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    • 2011
  • Simple girder bridges are more economical than commonly used PSC box girder bridges in high-speed railway construction, if they secure the riding stability. In this study, the dynamic behavior and riding stability of the newly developed precast V-girder bridge are analyzed. The dynamic moving load analysis is used including two train load case : the KTX train and freight train.

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