• Journal of the Korea Institute of Building Construction
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• v.15 no.1
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• pp.81-87
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• 2015

The purpose of this study is to analyze the problem of confusing the names of Chinese granite used in Korean construction work and suggest the improvement plans for them. Interviews of the experts from the stone company, studies on the existing research literature, and analyses of construction work documents of the 23 construction works which used Chinese granite were carried out to analyze the real condition of name confusion of granite stone. In the analytical result of the real condition, name confusion was classified into 4 types and problems derived from it were done into 4 ones. An additional survey was carried out targeting 34 masonry experts to draw the improvement plans based on the analytical results of the real condition of name confusion. The results show that the most fundamental solution is to continue to make efforts to use exact names when main agents related to construction works communicate with each other regarding Chinese granite stone and the process to make out construction contract documents.

• Journal of Korean Society of Disaster and Security
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• v.14 no.3
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• pp.51-63
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• 2021

This study is for the quality improvement of water-sealing & reinforcement grouting in tunnel of the construction of the underground transportation network underneath the city. Existing tunnel grouting process did not technically utilize P~q~t charts fully. It is due to the absence of technical methods to decide how P~q~t charts change in the presence of trouble and what the change represents in grouting. There were no standards to decide which chart pattern represents which ground characteristics, how to categorize ground types, and how to take measures according to the standards. This paper studies on the grouting type, ground characteristics, ground type categorizing method, and countermeasures for both general and algorithm-processed grouting in soil and rock layer to address the aforementioned problems. Newly improved P~q~t charts from grouting in soil was categorized into six different types. Different characteristics and categorization method was developed for each type. Countermeasures for each type of grouting process were developed so that on-site application can be readily available. Improved P~q~t charts for rock layer also have six different types of grouting. Each type was given the countermeasures for rock layer grouting process for easier applications. Therefore, it is expected to be used through out the entire process of grouting from preparation to the last report of the water-sealing & reinforcement grouting in tunnel of the construction of the underground transportation network underneath the city.

• Land and Housing Review
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• v.5 no.1
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• pp.41-51
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• 2014

The amount of new apartment construction has been trending upward in 3~4% each year since 11% increase in 2002. Currently, in public apartment construction sites under separate delivery system for construction waste processing, the significant difference between estimated quantity for contract and actual amount frequently causes severe controversy among project participants. Many factors such as poor environmental management, inadequate contractual amount are assumed to influence the above problem, and the requirement to revise existing generation rates, the key criteria applied in estimating the quantities of waste, is increasing. Most of generation rates were established in early 2000's, and have difficulty in reflecting the changes from new materials and technologies accordingly. Therefore, this study aims to clarify the types of construction waste for each trade and the forecast method as preliminary work in order to develop more accurate generation rates for construction waste in new construction. To achieve this purpose, the architectural bills of quantities in ten apartment projects executed during 2010~2013 were collected, and the possible waste types and reasonable material loss ratio for each item from temporary works to owner-supplying material area were defined and compared through the workshops and interviews with the experts and on-site environmental managers. The results of this study will contribute to establishing the categories of construction waste for construction trades and proper generation rates by the indirect estimation method in new apartment construction in the follow-up study.

• Korean Journal of Construction Engineering and Management
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• v.11 no.3
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• pp.97-104
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• 2010

The expressway construction work is being recently diversified even the working environments and the working kinds due to getting large scale, complexity, and high technology. The accidents are increasing according to large scale even in construction equipment and to a rise in high-ground work, thereby being required an effort of reducing accidents. However, it is insufficient in a means of coping with the technically safety management of using specific and scientific method. In order to prevent accident, a specific plan is needed that can apply each in variables to safety management by analyzing the accident types and accident factors with statistical method. Accordingly, this study carried out investigate on accidents for 12 years in the expressway construction work, and aimed to analyze characteristics on the accident type and conversion disaster-victim number according to factors with occurrence of accidents. Thus, the empirical analysis was performed. As a result of research, first, as a result of verifying significant difference with accident type by accident factor, the significant difference was shown between a cause for occurrence of accident and height with occurrence of accident. Second, among factors by period, the time with occurrence of accident was indicated to have significant difference from conversion disaster-victim number. Among factors by work condition, the cause for occurrence of accident, the height with occurrence of accident, and the type with occurrence of accident were indicated to have significant difference from conversion disaster-victim number. What suggested by analyzing characteristics in these factors and variables has important significance as a countermeasure for safety management.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.319-324
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• 2003

There is much more possibilities of encounter of critical problems and uncertain factors in construction project it is very important to analyze various risk factors of the project in its first stage. Because of the uncertainty, we need to study about the construction insurance scheme for risk-transfer within construction management method. This research methodology has been devised through analysis of characteristic of classified domestic construction insurance as well as some related foreign insurance system.

• International Journal of Highway Engineering
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• v.12 no.2
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• pp.33-41
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• 2010

It is stated in the highway geometric design guide that expressway interchange types should be selected considering a set of input variables including travel demand, topography, construction cost and interchange spacing. However, this selection method has a problem of providing different interchange types even for the same input variables depending upon different applications of engineers discretion. A procedure that produces consistent results is necessary and this paper presents the development of an efficient and reliable procedure based on the quantification of road user costs and construction costs on interchanges. To develop this procedure, a survey of existing expressway interchange types in South Korea was made and 10 basic interchange types and 52 supplementary interchange types were identified. To relate road user costs and construction costs to these interchange types, this research uses two method. First, interchange types were expressed by a set of ramp configurations. Second, road user benefits and construction costs associated with these different interchange types were formulated based on the current national guide of the expressway economical analysis. As a result, it was proved that an interchange type to provide minimum costs could be selected consistently and this research result should be useful for future expressway geometric designs.

• Construction Engineering and Management
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• v.10 no.3
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• pp.41-45
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• 2009

• Construction Engineering and Management
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• v.23 no.4
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• pp.4-7
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• 2022

• Journal of the Korean GEO-environmental Society
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• v.13 no.2
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• pp.49-57
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• 2012

Large-scale collapse happened under excavation construction in the past. But, recently the trend that it is completed safely to minimize damages is growing because of increasing levels of design review and detecting signs of problems before the outbreak of large-scale collapse with proactive planning of measurement. In this paper, through studying case collapses over the past, it put the cause of the collapse in order. And then, after reviewing general information on management and utilization of measurement methods which importantly emerging recently, the type and cause of the problem during the excavation was reviewed. And the causes of problem were analyzed by targeting the site which unusual symptoms happened on measuring results under construction. In this study, the awareness that measurement management and subsurface investigation is highly important will increase for preventing large-scale collapse in advance.

• 월간 기계설비
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• s.267
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• pp.65-71
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• 2012

지난 8월 13일 서울 종로구 소격동 국립현대미술관 서울관 공사현장에서 화재 발생으로 4명이 숨지고 18명이 중경상을 입는 등 많은 인명피해를 냈다. 이처럼 인명피해가 컸던 것은 우레탄 공사를 하던 밀폐공간에서 불이 나면서 발생한 유독가스 때문에 사람들이 제대로 대피하지 못했기 때문이다. 사고발생 원인으로 '용접공사' 여부를 놓고 공방을 벌였으나 경찰은 '전기합선'이라는 잠정 결론을 내렸다. 지난 2008년 1월에 발생한 경기도 이천 냉동창고 화재는 40명의 목숨을 앗아갔다. 화재 원인은 냉동배관을 설치하면서 전기 용접을 하기 위해 불을 붙였다가 공기 중에 차 있던 유증기(기름증기)와 만나면서 폭발이 일어난 것이었다. 인화성 액체(유기용제)를 취급하는 건설현장에서는 다량의 유증기가 발생할 수 있을 뿐만 아니라 건조한 조건일 경우 정전기에 의한 화재 폭발 누출사고의 발생 위험이 높다. 기계설비공사에서 화재, 폭발 위험성이 가장 큰 공사는 용접공사이기에 용접공사를 할 때 화재, 감전의 위험성을 배제한 후 공사에 들어간다. 용접으로 인한 사망사고의 유형으로는 용접 중 추락사고와 더불어 용접 불꽃이 가연성 물질에 옮겨 붙어 화재 발생으로 인한 질식사, 용접작업 중 절연체가 파손된 용접기 홀더 충전부의 접촉으로 인한 감전사 등이 있다. 본지는 용접으로 인한 화재 감전 등의 사고발생을 미연에 방지하기 위해 안전작업 수칙 및 안전수칙 체크리스트, 재해사례를 지난호부터 시리즈로 연재하고 있다.