• Magazine of the Korea Concrete Institute
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• v.10 no.5
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• pp.47-57
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• 1998

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.213-217
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• 2003

고가도로 또는 돌로 교량공사는 중요하고 또 소요에 따라 건설공사가 전국에서 진행되고 있다. 또한 이들 공사과정에서 발생되는 사고들이 있고 잠재위험성은 상존하고 있다. 상기 원인들에는 상부 콘크리트 스라브판 거푸집 지지대의 시스템, 지지대보강법, 지지대의 기초판, 기초판 저면의 토질상태, 그 위에 보조로 타설버림 콘크리트의 신뢰도 등을 들 수 있겠다.(중략)

• Magazine of the Korea Concrete Institute
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• v.5 no.4
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• pp.66-76
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• 1993

철근콘크리트 구조물의 공사중 뼈대공사라고 할 수 있는 철근공사에 있어서, 현행 철근의 절단 절곡 가공방법은 현장 인력 수작업에 의한 가공 즉 노동집약적 형태로 운영되어 왔으며, 특히 절단가공에 있어서는 철근의 강도저하가 우려되는 산소를 사용한 가열절단으로 행해지고 있어, 본고에서는 이와같은 현장여건을 개선하고, 궁극적으로 인력절감, 현장 생산성 및 품질 향상을 꾀하기 위하여 철근 가공(절단,절곡) 기계화 시스템을 적용한 시공사례를 중심으로 소개하기로 한다.

• Magazine of the Korea Concrete Institute
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• v.14 no.5
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• pp.31-38
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• 2002

최근 환경문제에 대한 일반인의 관심고조와 함께 3D 기피현상에 따른 철근공, 거푸집공 등의 기능노동자의 부족, 고령화, 외국인노동자 고용 현상과 낮은 노동생산성은 건설업계의 심각한 현안이다. 과거에는 재료비의 비중이 높았으므로 재료의 낭비를 줄이기 위한 합리화가 추진되었다. 그러나 현재는 노무비 비율의 급격한 증대로 인하여 공기단축이나 합리화, 시스템화를 통해서 경쟁에서 생존해 나가고 있다. 건축공사 중 특히 철근 콘크리트공사는 기술의 발전이 느리고, 시공 방법도 과거의 공법을 그대로 유지하고 있는 실정이다. 건축공사비 중 구체공사의 비율은 30% 정도이고, 그 비용 중 인건비가 50% 정도를 차지하고 있기 때문에 철근 콘크리트 공사는 아직도 기술 집약적인 산업이 아닌 노동 집약적 산업으로 간주되는 결과를 초래하고 있다.(중략)

• Journal of the Korean Society of Safety
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• v.19 no.4 s.68
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• pp.161-165
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• 2004

Safety and efficiency in the construction of RC structures mainly depends on optimal operation of shore-slat systems. The disasters in RC construction are mainly due to excessive load applied to falsework and premature removal of supports. Development of sufficient compressive strength of early-age connote is essential for the safety of structures during construction. Most of studies on shore-slab interaction have focused on flat slab structures. In this study, load distributions in floor slabs and supports during the construction of shear wall-type RC apartment building structures is investigated using finite element analysis.

• Magazine of the Korea Concrete Institute
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• v.9 no.2
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• pp.62-70
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• 1997

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.37-40
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• 2008

Recently, Construction Business, is changing very quickly, exceedingly needs to slim down the construction expensive by reducing material costs and the term of works. The term of formwork takes 25% of the term of works and costs 15% to 20% of the cost of construction. Hereupon, the purpose of this study is to investigate the Axial Strength of Centrifugall Formed Shell PC Columns that can reduce the term of formwork, the costs of material, the difficulty of throwing away the waste. Shell PC Column is loaded stirrups and manufactured at factory, so it has good points like construction's quality control and part's precision. However, it needs to be tested for checking bonded ability because it is set up at core and coverd with concrete. therefore this study is necessary three type of columns, which are a RC column, different type of two compressive strength core concrete columns and a Shell PC Column. By three columns, this study compare with and analysis three columns's bonded and Compressive Behavior abilities.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.487-490
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• 2003

국가의 사회간접자본 시설확충 정책에 따라 교량공사의 건수는 계속 증가되어 오고있다. 교량공사는 수상공사, 육상공사로 나뉘고 다시 우물통기초, 교각, 상판공사로 분류될 수 있는데 상판공사 스틸박스거더, 콘크리트 박스거더 위에 설치되므로 물위에서 또는 땅 위에서의 높이가 수십m에 이르게 되어 추락했을 때 특히 위험하고 상판을 FCM공법으로 물위의 수십m 위에서 진행되는 경우가 대부분이다.(중략)

• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.1
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• pp.9-20
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• 2023

For highway concrete structures, the deterioration of the structure is accelerated due to the increase in the use of deicing materials, and sectional repair work is being frequently carried out to restore performance. However, after the repair work, re-damage such as cracks, delamination, and poor bond performance is exhibited in the repaired sectional area. In this study, overseas repair material requirements were first analyzed, and present domestic requirements were improved repair material performance through field surveys of common concrete structures, laboratory experiments, and test construction on a disused concrete bridge. In addition, performancebased quality requirements were presented so that all materials that meet the required performance can be applied, and different test methods for each material were unified into concrete test methods for consistent test results analysis. The considered performance requirements were compression strength, bending strength, and bond strength for structural properties, and length change rate, crack resistance, thermal expansion coefficient, and elasticity coefficient were for dimensional behavior. For resistance to chloride penetration resistance and freeze-thaw resistance were presented as durability. The proposed requirements for concrete repair materials are expected to contribute to the improvement of the quality of concrete sectional repair work in Korea.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.513-516
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• 2008

Recently, a demand for reduction of construction cost by reducing construction period is increasing because of the slump of the construction business, the increasing price of raw-materials and the enforcement of after-sale system. As a method of reducing construction period, many construction companies usually apply a method of reducing curing period. But if they use an existing early strength cement or admixture, they spend a heavy cost on materials and there are many problems, such as a heat of hydration and a loss of workability. The purpose of this research is a reduction of construction cost by reducing construction period as a earlier removal time of form. To check up application of concrete using high early strength binder and admixture, comparative tests were carried out with concrete using an existing early strength cement or admixture such as tests of diurnal variation, setting time and compressive strength.