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김형규,박은형,조국환,Kim, Hyeong-Gyu,Park, Eun-Hyung,Cho, Kook-Hwan 한국터널지하공간학회 2018 한국터널지하공간학회논문집 Vol.20 No.3
도심지 지하공간의 개발과 운행선 하부를 저토피로 입체 교차화하는 시설 증가에 따라 비개착식 공법의 수요는 점차 증가추세에 있으나 대다수의 공법은 중대구경 강관을 압입하여 루프를 형성하고 내부를 굴착하는 파이프루프(Pipe roof) 계열의 공법이 주로 적용되고 있다. 강관 압입 시 발생되는 이완영역 및 하중은 여러 인자의 영향을 받게 되나 가장 큰 요소는 압입하는 강관의 크기에 좌우되며 이는 강관 루프 내 지중구조물에 작용하는 하중의 크기로 볼 수 있다. 지반의 교란 및 이완하중 발생을 최소화시키기 위해 개발된 SEM공법(Super Equilibrium Method)은 기존의 중대구경 강관 대신 ${\Phi}114mm$ 내외의 소구경 강관을 사용한다. 이 소구경 강관을 SEM파일로 명명하였으며 강관의 선 압입 및 그라우팅 보강을 실시한 후 지반의 침하나 융기 없이 지반 내 횡단구조물을 유압잭을 이용하여 압입하게 된다. 이와 같이 SEM공법의 구성 중 지보역할을 하는 SEM파일은 선단부 굴착 시 지반의 붕락을 방지하고 상재하중을 지지하기 위한 길이 5 m 내외의 Fore poling 파일이며 이 파일의 배치간격, 시공연장, 부재의 강성 등을 산정하기 위해서는 이완영역의 적절한 산정이 필수적이다. 본 논문은 SEM공법의 최적설계를 위하여 SEM파일 압입 시 발생되는 이완하중 산정 값을 비교분석하였다. 이완영역 산정에 근거한 주요 이론식 및 경험식들의 영향인자를 고려하여 분석하고 FEM analysis (유한요소 해석)를 수행하여 SEM파일에 적합한 이완하중 산정을 검토하였다. 또한 실제 SEM파일 압입 및 굴착 시 발생되는 지반이완을 확인하기 위해 강관압입 축소모형실험을 수행하였으며 토피고/강관(H/D)에 따른 지표침하 및 지반이완을 정량적으로 검토하였다. With the increased development in downtown underground space facilities that vertically cross under a railway at a shallow depth, the demand for non-open cut method is increasing. However, most construction sites still adopt the pipe roof method, where medium and large diameter steel pipes are pressed in to form a roof, enabling excavation of the inside space. Among the many factors that influence the loosening region and loads that occur while pressing in steel pipes, the size of the pipe has the largest impact, and this factor may correspond to the magnitude of load applied to the underground structure inside the steel pipe roof. The super equilibrium method (SEM) has been developed to minimize ground disturbance and loosening load, and uses small diameter pipes of approximately 114 mm instead of conventional medium and large diameter pipes. This small diameter steel pipe is called an SEM pile. After SEM piles are pressed in and the grouting reinforcement is constructed, a crossing structure is pressed in by using a hydraulic jack without ground subsidence or heaving. The SEM pile, which plays the role of timbering, is a fore-poling pile of approximately 5 m length that prevents ground collapse and supports surface load during excavation of toe part. The loosening region should be adequately calculated to estimate the spacing and construction length of the piles and stiffness of members. In this paper, we conducted a comparative analysis of calculations of loosening load that occurs during the press-in of SEM pile to obtain an optimal design of SEM. We analyzed the influence of factors in main theoretical and empirical formulas applied for calculating loosening regions, and carried out FEM analysis to see an appropriate loosening load to the SEM pile. In order to estimate the soil loosening caused by actual SEM-pile indentation and excavation, a steel pipe indentation reduction model test was conducted. Soil subsidence and soil loosening were investigated quantitatively according to soil/steel pipe (H/D).
자켓-받침형 정착장치를 이용한 외부 강선으로 보강된 RC보의 실험적 평가
김형규(Kim Hyung Gyu),박준명(Park Jun Myung),양동석(Yang Dong Suk),박선규(Park Sun Kyu) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
External prestressing is a post-tensioning method that is becoming popular not only in new bridge construction but also as a strengthening method for existing concrete structures. In an externally prestressed structure, the tendons are placed on the outside of concrete sections to which they are in contact only at anchorages. However strengthening with external prestressing method, there are many faults to install anchorage system. This paper presents the result of a study on flexural capacity of reinforced concrete beams strengthened with external tendons using Jacket-Base anchorage system Jacket-base anchorage system without any damage to the structure and investigates feasibility of it. A total five concrete beams were constructed, tested and the response of the beams in terms of deflections, strains and modes of failure were examined.
김형규(Kim, Hyung-Gyu),이성호(Lee, Sung-Ho) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1
In society before environmental issues were mentioned seriously, human activities were not far out of their capacities to accommodate nature on the premise of belief in the invariance and infinity of natural environments. Considering the effects of architecture on the environment, environmental problems are no different from the national architectural activities. In this thesis, “Nature’s Form” is the alternative among many methodologies to achieve eco-friendly architecture. The aim of this study is to analyze the environmental factors of nature style of buildings based on the literature research and the case analysis method using natural forms in architecture.
자켓-받침형 정착장치를 이용한 외부 강선으로 보강된 RC보의 실험적 평가
김형규 ( Kim¸ Hyung Gyu ),박준명 ( Park¸ Jun Myung ),양동석 ( Yang¸ Dong Suk ),박선규 ( Park¸ Sun Kyu ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
External prestressing is a post-tensioning method that is becoming popular not only in new bridge construction but also as a strengthening method for existing concrete structures. In an externally prestressed structure, the tendons are placed on the outside of concrete sections to which they are in contact only at anchorages. However strengthening with external prestressing method, there are many faults to install anchorage system. This paper presents the result of a study on flexural capacity of reinforced concrete beams strengthened with external tendons using Jacket-Base anchorage system. Jacket-base anchorage system without any damage to the structure and investigates feasibility of it. A total five concrete beams were constructed, tested and the response of the beams in terms of deflections, strains and modes of failure were examined.