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연속주조법에 의한 Sn-38%Pb 공정합금의 초소성특성
송태석,조형호,최재하,지태구,김명한 ( Tae Seok Song,Hyung Ho Jo,Jae Ha Choi,Tae Gu Ji,Myung Han Kim ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.3
N/A The 8㎜ dia: Sn-38%Pb eutectic alloy rods were produced by use of the horizontal continuous casting process with the heated mold and chill cast process. The cast rods were rolled into 2.0∼0.5㎜ thick plates and structural and mechanical properties were examined. The results revealed that the plates produced by the continuous casting process with the heated mold show much higher superplasticity at ambient temperature (1550% elongation at 0.5㎜ thick plate and 0.5㎜/min strain rate) than the plates procured by chill cast process (630% elongation). Such a high superplasticity of the continuous cast plates is due to the high-quality plates free from any inside and surface defects with fine and uniform distribution of eutectic phases.
스마트건설 공사비산정기준 사례조사 연구 - 일본사례를 중심으로 -
송태석 ( Song Tae-seok ),안방율 ( An Bang-yul ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1
Recently, the need for smart construction technologies related to the Fourth Industrial Revolution has been increasing in order to improve productivity of the construction industry. The Ministry of Land, Infrastructure and Transport has established Smart construction technology road map to commercialize the smart construction, and research and development is also underway. However, due to the lack of cost estimation standards for such smart construction technologies to be deployed to actual sites, smart construction technologies are not actively applied to construction sites. In particular, cost estimation standards are needed for construction machinery equipment with ICT technology that is currently available for commercialization. Therefore, as a preliminary study for the development of smart construction cost estimation standards, a case study was conducted on ICT construction estimation standards in Japan and present them as basic data for standards in Korea.
현장 시공실태에 따른 철근공사 공사비산정기준 개선 연구
송태석(Tae-Seok Song),안방율(Bang-Yul Ahn),오재훈(Jae-Hoon Oh),이한수(Han-Soo Lee) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.11
철근콘크리트공사 공법은 건축물, 교량, 터널 등의 구조물의 골조를 시공하는데 가장 보편적으로 활용되고 있는 공법이다. 특히 철근공사는 건설공사 공사비 비중이 가장 큰 공종 중 하나로 철근 공사비의 변동에 따라 전체 건설 공사비가 영향을 받고 있어 적정한 건설 공사비산정을 위해서는 합리적인 공사비 산정기준이 필요하다. 본 연구에서는 현장 실태조사 및 내역서 분석을 통해 적정한 철근 공사비를 확보할 수 있는 기준을 제시하고 그 영향성을 분석해보았다. 먼저 기존 공사비 산정기준의 실태와 실제 현장 적용실태를 비교 분석하여 기존 철근 공사비 산정기준의 문제점을 도출하였다. 총 29개의 현장을 대상으로 구조물의 종류, 현장 여건, 철근 규격, 공장가공과 현장가공 등에 따른 가공 및 조립의 적용실태 확인 및 생산성 분석을 수행하였다. 본 연구를 통해 현장시공 실태가 반영된 합리적인 공사비 산정기준이 제시되었으며, 철근콘크리트공사 적정공사비 확보에 일조할 것으로 기대된다. The reinforced concrete construction method is the most commonly used method for constructing structures, such as buildings, bridges, or tunnels. In particular, reinforcing bar work form the largest part of the cost of construction work. Because the overall construction cost is affected by the fluctuations in the cost of reinforcing bar work, it is necessary to develop reasonable standards. This paper presents the standards for calculating the cost of reinforcing bar work. The effects were analyzed by investigating the status at the site and analyzing written details. This study derived problems in the existing standards for calculating the cost of reinforcing bar work by analyzing existing standards for estimating construction costs and how they are applied at the site. This research carried out field investigations on 29 construction sites and analyzed the construction productivity of rebar processing and assembly according to the structures, site conditions, rebar specifications, or factory or site processing. Based on the field investigation results, this research established a revision to the standards for calculating the cost of reinforcing bar work reasonably. It is expected that this will contribute to estimating the cost of reinforced concrete construction appropriately.
송태석 ( Song Tae-seok ),안방율 ( Ahn Bang-yul ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
Reinforced concrete is the most widely used construction method for constructing structures. There is a lot of process for constructing Reinforced concrete structures such as installing rebars, molds and support, mixing and placing concrete, and curing. So the reinforced concrete work accounts for a large part of the total construction cost for constructing structure. For this reason a reasonable standard for estimating the cost of reinforced concrete construction has to be established and it will be possible to secure appropriate costs for construction work. In this study, we analyze the revision factors of the standard for estimating the cost of reinforced concrete construction and present them to secure reasonable construction costs.
송태석 ( Song Taeseok ),한상준 ( Han Sangjun ),안방율 ( An Bangyul ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Steel construction is one of the commonly used methods in building construction due to its efficiency in terms of time and cost. In particular, the top-down method using steel frames is widely used in the construction of underground structures in urban areas to shorten the construction period. However, there is currently no standardized cost estimation for subway steel frame construction in Korea, causing difficulties in determining the expected cost. In this study, we aim to provide basic data for establishing a cost estimation standard for subway steel frame construction through on-site surveys of subway steel frame construction commonly used in urban areas.
철근콘크리트 구조물 유지보수 공사비산정기준 개정요인에 관한 연구
송태석 ( Song Tae-seok ),안방율 ( An Bang-yul ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
The proportion of maintenance work has been increasing due to the recent aging of the infrastructure, but the standardized construction cost estimation standards are insufficient for this. In particular, reinforced concrete structures are being applied to many structures such as buildings and bridges, and various construction methods for maintenance of reinforced concrete structures are being developed and applied. In this study, we surveyed about the current status of the construction method for the maintenance work of reinforced concrete structures and analyze the factors of the revision of the construction cost estimate standard for the reinforced concrete structure maintenance.