• Korean Journal of Construction Engineering and Management
• /
• v.6 no.6 s.28
• /
• pp.90-97
• /
• 2005

Poor usage of work-continuity for planning and management is one of the leading causes of decreased productivity in high-rise and complexity construction projects. For efficient finish work, tact scheduling method needs to be implemented according to tact time. But there are the studies about zoning of work area, daily construction information and tact planning and management, there are not the studies about tact time yet. The purpose of this study is to help implementation of tact scheduling by tact time and adjusted work-plan. The main contents of this study are as follow; (1)Tact time has been calculated as coordination of work-plan between a general contractor and specialties. (2)Project-plan can be without delay by tact time calculation method.

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2004.05a
• /
• pp.372-374
• /
• 2004

최근들어 비금속광물의 구조적 특성을 이용한 활용분야가 매우 다양해지고 있다. 특히 판상광물은 차폐(은폐)력이 매우 우수하고, 층간특성을 이용한 흡착 및 저장특성이 매우 우수하다. 본 연구에서는 이와 같은 판상광물의 기본의 특성에 또 다른 기능성 물질을 흡착시킴으로써 부가적인 새로운 기능성을 갖는 친환경성 건축소재를 개발하고자 천연산 인상흑연 및 견운모를 기능성 모소재로 사용하고 미립화 및 표면 환경기능화를 위하여 BMK로 흑연입자 표면을 기능화하였다. 제조된 기능성 마감재인 닥터하우스를 모르타르에 도포하여 다양한 기능성을 측정한 결과 78% 이상의 유해가스(포름알데히드) 정화제거효과 및 99.9% 이상의 항균, 항곰팡이 효과를 갖는 것으로 나타났다.

• Proceedings of the Korean Society of Disaster Information Conference
• /
• 2016.11a
• /
• pp.275-277
• /
• 2016

본 논문에서는 Door Fan Test 수행 사례를 중심으로 사전 준비에 필요한 사항에 대해 분석하였다. 분석 결과 관통부 주위 개구부, 벽체 틈새 개구부 등 방화구역의 누설부위를 통해 약제가 누출되는 문제가 있었다. 원인으로는 전기배선 공사로 인해 내화충전된 부분을 제거하고 공사 후 다시 충전하지 않는 경우, 벽과 천장사이의 틈을 내화 실란트 등으로 마감을 하지 않은 경우가 대부분이었다. 이와 같이 누설부위가 많은 경우 테스트의 결과 불합격이 나오게 되며, 이러한 문제점을 개선하기 위해 사전현장조사를 통해 방호구역의 누설부위를 조사하고 보완조치를 진행한 후 테스트를 수행하는 절차가 필요하였다. 한편, 테스트 운영에 관한 사항으로는 해당 실(room)을 위한 충분한 유량 미확보, 장애물로 인한 와류형성, 차압측정구의 설치문제 등이 있었다. 이를 개선하기 위해서 공기를 유입하는 실은 외부로부터 충분한 공기유입이 있어야하며, 팬 앞의 장애물을 제거하거나 팬의 설치 위치를 조정하는 것이 필요하며, 공기의 유동이 가장 적은 곳에 측정구를 설치하는 등의 조치가 필요하다.

• Korean Journal of Construction Engineering and Management
• /
• v.9 no.3
• /
• pp.118-125
• /
• 2008

In Korea, five days per week system, duration reduction bidding system, and post sale system have recently stimulated an interest in productivity improvement in construction project. However, analysis result of productivity in Korean construction industry found that the productivity is too low. APC (Architectural PC) is alternative of reveal wall and parapet in apartment housing prcjects and is used abroad broadly because of duration reduction for productivity improving. APC is used as external curtain wall in Dubai, North America, and Southeast Asia. Therefore, it is proposed that necessary to Introduce APC in Korea. The objective of this study is to draw up introduction of APC in apartment housing projects. We analysed the feasibility of the use of APC. The survey results reported that APC would be able to improve the productivity in the eight productivity factors.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.11
• /
• pp.110-117
• /
• 2017

In the construction of high-rise residential buildings in which the finishing works are done repetitively in each housing unit, the construction period and cost can be reduced, while maintaining the quality, if the work process is properly managed in order for the resources to be input continuously. Time management methods such as the Bar Chart, CPM and LOB are not appropriate, due to the difficulties involved in the diagraming of repetitive works and applying them to the project. The Tact method also has difficulties in maintaining a constant work flow and needs significant effort and cooperation from the subcontractors to allocate the resources consistently. Partitioning, base works for finishing, floor mortar plastering and the final finishing work are done sequentially in residential buildings projects, and there are many repetitive activities which differ in terms of the work method, work area and productivity. If these repetitive activities are synchronized or converged toward the last work area, the goal of process management can be achieved effectively. Therefore, a process planning method for the finishing works of residential building projects is proposed, which takes into consideration elements, such as the sequential relation between the activities in each housing unit and classification of repetitive works in terms of their management method, work area and production rate, for the continuous input of resources into the housing units.

• Journal of the Korea Concrete Institute
• /
• v.13 no.3
• /
• pp.277-284
• /
• 2001

Hardened concrete contains pores of varying types and sizes, and therefore the transport of air through concrete can be considered. The rate of permeability will not only depends on the continuity of pores, but also on the moisture contents in concrete and finishing material on concrete. Also it knows that the durability of reinforced concrete structure is concerned with air permeability which effects on the carbonation occurred by invasion of CO2 gas and the corrosion of steel bar occurred by O$_2$. In this paper, the effects of curing conditions and finishing materials on carbonation and air permeability are investigated according to the accelerated carbonation test. As results, carbonation velocity and air permeability are effected by curing conditions and finishing materials, and air permeability coefficient is effected by moisture content. Also the relationship between carbonation velocity coefficients and air permeability coefficients has been quite well established.

• Proceedings of the KAIS Fall Conference
• /
• 2010.05b
• /
• pp.1086-1088
• /
• 2010

본 연구는 지하 구조물의 내벽에서 발생하는 습윤(濕潤) 및 결로를 방지하는 내벽체에 관한 것으로, 사방으로 연결조립 가능한 벽체판넬의 한쪽을 수직 지지프레임에 끼움 조립한 상태에서 타카핀으로 벽체판넬 및 수직 지지프레임을 동시 관통하여 내벽에 고정한 후 상기 수직프레임에 다른 벽체판넬의 일측을 중첩되게 조립하는 방법으로 지하 구조물에 내벽체를 편리하게 시공할 뿐만 아니라 공기를 단축하며, 상기 내벽체의 구성부품이 매우 간소하면서 가격이 저렴하여 공사비를 대폭 절감할 수 있는 시공이 편리한 지하 구조물용 내벽체의 개발에 관한 것이다.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2019.11a
• /
• pp.64-65
• /
• 2019

Formaldehyde has been classified as a first-class carcinogen by international cancer research organizations. Formaldehyde causes various diseases such as sick house syndrome, building syndrome, chemical sensitivity etc. Formaldehyde is diffused from building materials and furniture. It has been published that research of phytoncide can reduce formaldehyde. In this study, we used phytoncide with cement matrix to reduce formaldehyde. As a result, the cement matrix strengths was increased slightly and formaldehyde has been reduced over time.

• Korean Journal of Construction Engineering and Management
• /
• v.4 no.1 s.13
• /
• pp.90-96
• /
• 2003

The purpose of this study is to present an improvement building construction process by using prefabricated materials. The current slab form work has waste factor by unnecessary process and not complete integration with the finishing process. Therefore the study used value stream analysis methodology for effective improvement of slab form work process. The main contents of the study are as follows; 1) Non-value adding activities were found at existing slab form work process by current state mapping(CSM) 2) Future state mapping(FSM) suggest process Integration to slab form work. 3) Slab form work is analyzed reduction time-cost by prefabricated material. The study recommends that, as a future research, development of tool and technique for the non-value adding activities are eliminated in building construction and application of prefabricated material should be increased.

• Proceedings of the SAREK Conference
• /
• 2005.11a
• /
• pp.3-8
• /
• 2005

Building parts of Multi-Family Houses are consisted of several building material assembly. Therefore, after selecting building materials with test result of emission intensity and their feature, composed building materials are made equally with actual construction methods, and experimented emission intensity. 7 days after experiment, formaldehyde emission intensity appeared low in an order of Tile Wall, Wood Flooring, Wallpaper, Reum Flooring, Silk Wallpaper, and 20 days after experiment, TVOC emission intensity appeared low in an order of Tile Wall, Reum Flooring, Silk Wallpaper, Wood Flooring, Wallpaper. There was a clear difference in TVOC emission intensity according to kind of building materials. Composed building materials that weight per unit area is big and omission intensity is high, they effect continuously to indoor air because decrement is small.