• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.1
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• pp.89-97
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• 2013

With regard to complex-shaped tall buildings whose plans and constructions have been gradually on the increase, this study was aimed to analyze their structural behaviors during construction by applications of construction sequences analyses to prototype models. For twisted tall buildings, total 18 models of with three conditions of a lateral load-resisting system, a twisting angle, and a construction method were selected. A diagrid system and a braced tube system were applied as a lateral load-resisting system. For each lateral load-resisting system, three types of plan with $0^{\circ}$, $1^{\circ}$, and $2^{\circ}$ twisting angles and three construction methods with construction sequences of exterior tube and interior frame were assumed. The structural performances of tall buildings under constructions were analyzed with results of lateral displacements from construction sequence analyses. Also, construction performances of the construction period and the maximum lift weight were compared.

• Korean Journal of Construction Engineering and Management
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• v.15 no.4
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• pp.30-38
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• 2014

Achieving high productivity and constructability are very important issues in construction industry. Study on constructability have been conducted actively, and many researches referred that improving constructability can enhance cost, quality, schedule, productivity and so on. However, there are lack of quantitative analysis, since most studies have proved correlation between productivity and constructability using questionaries and by case studies. Also, researches are mostly about specific detail scope of work to improve constructability, thus it is hard to apply constructability factors on various work in construction. In this paper, will deduct general factors affecting on constructability and evaluate effects of factors affecting on each work. Furthermore this paper will verify impact of factors affecting on productivity by multi regression anlaysis using actual data sets of high-rise building construction site.

• Korean Journal of Construction Engineering and Management
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• v.19 no.3
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• pp.79-88
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• 2018

Construction business VE is classified into design stage VE and construction stage VE. The faster the application, the better the effect. Therefore, the design stage VE was legislated in 2000 and actively applied. However, it is urgent to activate the construction VE, which is complementary to the design VE system. In the meantime, we have made a lot of efforts to activate construction VE by suggesting the necessity of construction VE system, improvement of technology development compensation system, concrete implementation method of construction VE, but it was not effective due to lack of related laws. This study compares and analyzes construction VE system in Korea and abroad for the activation of construction VE after recognizing such domestic reality. A survey of experts in each field of the construction industry was conducted and suggestions for improvement of construction VE system suitable for domestic construction industry were suggested.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.3A
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• pp.277-286
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• 2010

Derrick or caterpillar crane is generally used for the long-span/cable-stayed bridge construction by pre-cast segment lifting from over-land or water transportation. The heavy weight of them, however, could make defects on unstable under-construction structure and, furthermore a method of conventional segment transportation is also able to occur additional time and cost. In this study, in order to improve conventional construction method, the newly developed derrick crane is mainly considered. It could be not only eccentrically loadable on constructing girder but having rotatable boom for segment transportation from back-side. A series of construction stage using developed derrick crane is defined and also its numerical analysis is conducted. To reflect load characteristics of developed derrick crane on construction stage analysis, on/out of service load is separately calculated by considering vertical/lateral rotation range of boom and it is loaded on 4 fixed positions of crane. The derrick crane on this study could be time and cost saving solution for cable-stayed bridge construction and also make contributions to construction load reduction in its process.

• Korean Journal of Construction Engineering and Management
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• v.25 no.4
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• pp.15-23
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• 2024

Recently, quality problems, such as the collapse of apartment structures under construction, has emerged as a social issue. Although there are various causes of quality problem and the impact of each problem may be different, the problems from the perspective of construction engineer of construction company are investigated. Therefore, this study aim to investigate the adequacy of construction engineer's experience, number of field engineer, timing of engineer deployment at construction sites, etc. in order to resolve quality and safety problems. In this study, a questionnaire survey was conducted targeting construction managers to obtain objective opinions. The results showed that the number of construction engineers in construction companies should be increased and that intermediate construction engineers should be increased to enable practical site management for resolving quality and safety problems. In addition, it was found that there was a need to reduce the number of non-regular employed field construction engineers in construction site and at the same time systematically regulate the number of on-site construction engineers, similar to safety managers and quality managers.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.229-232
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• 2008

In rapid cycle construction, RC structure which is not cured fully can be loaded with construction load and this construction load can influence on the safety of construction and cracks on slabs. Therefore, to reduce the term of construction, the safety of construction and prevention of cracks should be assured against construction load. In the previous study, temperature load can significantly influence on the behavior of structure under construction. However, existing construction sequential analysis or design code do not consider temperature load reasonably. In the present study, through construction sequential analysis method using FE analysis, the behavior of structure under construction was analyzed according to temperature changes. According to the results of analysis, as the temperature falls, shoring load drops and the temperature rises, shoring load rises. These variations of shoring load can affect the safety of construction. Moment of slab goes up by fall in temperature. This increase of moment can cause cracks on the slab. Therefore to assure the safety on construction and prevent cracks on slabs, temperature load has to be considered reasonably in construction sequential analysis.

• Proceedings of the Korean Geotechical Society Conference
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• 2002.11b
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• pp.115-140
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• 2002

이암층, 함탄층, 석회암층과 같은 특수지질불량구간에서 터널과 암반사면의 합리적인 시공을 달성하기 위해서는 먼저 대상지질에 대한 지질특성, 암반특성을 정확히 이해하는 것이 필요하며, 지반특성에 적합한 지보대책을 수립하도록 하여야 한다. 본고에서는 전형적인 퇴적암지층으로 알려진 포항지역중 중생대 퇴적암류로부터 신생대 제 3기의 미고결 퇴적암류에 이르는 다양하고 복잡한 지질구조를 이루고 있는 지역에서의 터널 및 암반사면의 시공사례를 통하여 시공중의 제반문제점을 검토하여 이암층에서의 안전하고 합리적인 터널/암반사면의 시공방안에 대하여 고찰하였다.

• 월간 기계설비
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• s.321
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• pp.84-85
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• 2017

한국종합건설기계설비협의회(회장장 이용우)는 지난 2014년 '기계설비시공 개선사례집'을 발간했다. 2004년 초판본 발간에 이어 2008년 1차 개정판이 나온 후 2차 개정판이다. 기계설비시공 개선사례집은 그동안 기계설비 관련 종사자들의 지침이나 교육 등의 참고자료로 적극 활용되어 기계설비업계 발전에 기여해왔다. 그러나 시간이 흐름에 따라 기술의 발전, 새로운 분야 부각, 기존과 다른 다양한 기술적 해결방안이 도출되면서 수정 및 보완의 필요성이 대두되었다. 이에 따라 협의회는 2012년 3월 2차 개정판을 발간키로 의결하고 협의회 회원 중 13명의 전문가를 2차 개정판 편집위원(위원장 이재곤)으로 선임, 개정판 발간작업에 들어가 2년여의 작업 끝에 결실을 맺었다. 본지는 기계설비시공 개선사례집이 전 건설현장에서 정밀시공을 위한 현장 실무가이드로 정착할 수 있도록 연재 중이다.

• 월간 기계설비
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• s.300
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• pp.123-130
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• 2015

한국종합건설기계설비협의회(회장 이용우)가 지난 해 '2014 기계설비시공 개선사례집'을 발간했다. 지난 2004년 초판본 발간에 이어 2008년 1차 개정판이 나온 후 2차 개정판이다. 기계설비시공 개선사례집은 그 동안 기계설비 관련 종사자들의 지침이나 교육 등의 참고자료로 적극 활용되어 기계설비업계 발전에 기여해왔다. 그러나 시간이 흐름에 따라 기술의 발전, 새로운 분야 부각, 기존과 다른 다양한 기술적 해결방안이 도출되면서 수정 및 보완의 필요성이 대두되었다. 이에 따라 협의회는 2012년 3월 2차 개정판을 발간키로 의결하고 협의회 회원사 중 13명의 전문가를 2차 개정판 편집위원(위원장 이재곤)으로 선임, 개정판 발간작업에 들어가 2년여의 작업 끝에 결실을 맺었다. 본지는 기계설비시공 개선사례집이 전 건설현장에서 정밀시공을 위한 현장 실무가이드로 정착할 수 있도록 연재 중이다.

• 월간 기계설비
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• s.303
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• pp.126-130
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• 2015

한국종합건설기계설비협의회(회장 이용우)가 지난 해 '2014 기계설비시공 개선사례집'을 발간했다. 지난 2004년 초판본 발간에 이어 2008년 1차 개정판이 나온 후 2차 개정판이다. 기계설비시공 개선사례집은 그 동안 기계설비 관련 종사자들의 지침이나 교육 등의 참고자료로 적극 활용되어 기계설비업계 발전에 기여해왔다. 그러나 시간이 흐름에 따라 기술의 발전, 새로운 분야 부각, 기존과 다른 다양한 기술적 해결방안이 도출되면서 수정 및 보완의 필요성이 대두되었다. 이에 따라 협의회는 2012년 3월 2차 개정판을 발간키로 의결하고 협의회 회원사 중 13명의 전문가를 2차 개정판 편집위원(위원장 이재곤)으로 선임, 개정판 발간작업에 들어가 2년여의 작업 끝에 결실을 맺었다. 본지는 기계설비시공 개선사례집이 전 건설현장에서 정밀시공을 위한 현장 실무가이드로 정착할 수 있도록 연재 중이다.