• 한국안전학회지
• /
• 제22권1호
• /
• pp.54-60
• /
• 2007

This paper describes typical design and construction practice for in-situ ground reinforcement technique using improved steel pipe pressure grouting. A case history is presented to illustrate the benefit gained by application of the technique. This technique was applied to cut slopes developed in the construction of auxiliary spillway of 00 dam. Applicable conditions, method of survey, slope stability analysis and construction are given in this parer. As for the construction method, a procedure is given and the main points are the control of construction work. As a result of the pull-out test, it is shown that seel pipe nailing is particularly useful for stabilizing rock slope.

• 화약ㆍ발파
• /
• 제15권2호
• /
• pp.53-72
• /
• 1997

It is impossible to precat the behavior of ground soil and structure accurately during underground construction in urban area or excavation in soft ground area because of difference between the assumed design condition and the actual site condition. Therefore, it must be managed by measuring system and correct the difference by real data. Large scale under ground construction in urban area like a seoul subway project has needed for Intelligent Construction technique, a field of the Engineering Contractor. The automated measuring system is developed for the technique. It is described that the procedure and the method of measuring work with application of the automated measuring system.

• 헤리티지:역사와 과학
• /
• 제45권4호
• /
• pp.92-103
• /
• 2012

본 연구는 고건축 기술사적 관점에서 첨성대 축조당시 가설공법을 규명하고자 하였다. 독특한 구조와 형태로 이루어진 첨성대는 그동안 많은 관심을 끌며 연구되어왔으나 고건축 기술사적 측면에서 접근한 사례를 보기 어렵다. 더욱이 첨성대 축조기술에 관한 연구는 고건축 기술사적 고찰기반이 취약한 추론으로 전개되어 있으므로 많은 의문점을 남기고 있다. 여러 가지 의문점 가운데 가설공법에 대한 논의는 고건축시공 규준방식과 드잡이에 관한 기술사적(技術史的) 고찰을 결여한 추론으로 전개되어 있으므로 신빙성 있는 역사적 사실규명으로 보기 어렵게 한다. 연구결과 첨성대축조 가설공법에 대한 규명은 실제유구가 남아있지 않아 직접 고찰에 한계가 있었으나, 그간의 오류 폭을 좁히고 기초자료 제공에 의한 기술사(技術史) 연구 활성화를 기대할 수 있게 되었다. 주요 연구결과는 세 가지로 정리되었다. 1. 원통형 구조로 이루어진 첨성대축조 규준방식은 또한 +자먹 규구법과 다림추를 이용한 준승방식에 기초한 중심축 규준을 적용하였음으로 고찰되었다. 2. 첨성대 축석공사는 규구준승에 기초한 규준방식과 부합하는 드잡이공사 방법으로 녹로사용 가능성이 고찰 검토되었다. 3. 첨성대축조 규준과 드잡이기술에 대한 고찰 결과 규구준승에 의한 규준방식과 녹로(??)를 이용한 드잡이공사는 축석공사에 별도로 운반을 위한 비계가설을 요하지 않는 고건축 시공기술로 고찰되었다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2005년도 춘계 학술기술논문발표대회 논문집
• /
• pp.219-222
• /
• 2005

Recently, remodeling has been a major field of the building construction that comes up for the alternatives of the reconstruction and the economical construction method. In the almost cases, the engineering capacity for the repair/rehabilitation of the remodeling should satisfy also the owner's various needs (eg, the minimum construction time, etc.) and the safety of the building. Also, the engineering and construction technique for remodeling should be applied to the contrary point of view of the general construction method. But, the many problem actually has arose from the wrongly applied construction method that is caused with the insufficient researches and development. Therefore, this study would suggest the necessities and the directions of developing the elementary engineering technique and the method that satisfy the owner's various needs for the remodeling and repair/rehabilitation of the multi-owned building as multiplex shop, with the successful construction cases.

• 국제학술발표논문집
• /
• The 3th International Conference on Construction Engineering and Project Management
• /
• pp.1081-1087
• /
• 2009

An automatic construction system in Korea is now at the stage of the full automation like in Japan, and an actual pilot project is going to be built in 2009. However, in developing a new construction system that has never been implemented before, there is a need to assess the performance and to consider the uncertainty of the system. The program evaluation and review technique (PERT) allows dealing with this uncertainty. Thus, this paper implements an analysis of the process of steel fabrication and makes suggestions for time-related problems arising from the analysis. The time required for steel erection by the automatic system was compared with that in the traditional method. In the result, finding out another construction process and improving robot performance were proposed to resolve the problems. The results will contribute to promoting the development of an efficient system for the new automatic construction system.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2003년도 학술대회지
• /
• pp.383-387
• /
• 2003

현재 국내 건설산업에서의 공정계획은 합리적인 사전계획 없이 현장기술자의 경험과 능력에 따라 계약공기에 맞추는 방식으로 추진되고 있다. 또한 공정계획의 핵심인 광기산정은 업체마다 서로 차이를 보이고 있어 객관적인 공기산정이라고 할 수 없는 실정이다. 이러한 공정계획의 부실은 공정계획 현장 적응 시 공기 및 작업순서의 차이를 발생시켜 효과적인 공정관리가 이루어지지 못하는 원인이 되고 있으며, 다양한 공기지연 사유가 발생하고 있다. 본 연구에서는 현재 제조업에서 적용중인 제약이론 기반의 CCPM(Critical Chain Project Management)의 확률적 공기산정과 공정버퍼의 개념을 건설 프로젝트에 적용하여 합리적인 공정계획 수립 방안을 제시하였다.

• Journal of Construction Engineering and Project Management
• /
• 제2권3호
• /
• pp.1-7
• /
• 2012

The reconstruction of surfaces from unorganized point clouds can provide very useful information for construction managers. Although point clouds are generally created using 3D scanners, they can also be generated via the structure-from-motion technique using a sequence of images. Here we report a novel surface reconstruction technique for modeling and quantifying earthworks that can be used for preliminary planning, project updates and estimating of earthwork quantities, as well as embedded planning systems in construction equipment. The application of structure-from-motion techniques in earth works is examined and its advantages and limitations identified. Data from 23 earthwork excavation construction sites were collected and analyzed. 3D surface reconstructions during the construction phase were compared to the original land form. Similar experiments were conducted with piles of earth and the results analyzed to determine appropriate ranges of use for structure-from-motion surface reconstructions in earthwork applications. The technique was found to be most suited to pile of materials with volumes less than 2000 m3. Piles up to 10 m in height and with base areas up to $300m^2$ were also successfully reconstructed. These results should be of interest to contractors seeking to utilize new technology to optimize operational efficiency.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2007년도 정기 학술대회 논문집
• /
• pp.84-89
• /
• 2007

In this paper, we introduce a new technique for automatic construction of steel frames in high-rise buildings. Basically, we combine advanced robotic technologies to building construction techniques. Four main topics will be developed such as: 1) Planning and synthesis of automatic construction system, 2) Development of construction factory system with climbing oil-pressured robot, 3) Core techniques for automatic assembly for steel frames, and 4) Intelligent resource management system. We expect that this new technique will increase the construction efficiency and will alleviate the manpower shortage problem in the aging society.

• 국제학술발표논문집
• /
• The 3th International Conference on Construction Engineering and Project Management
• /
• pp.493-498
• /
• 2009

Recently, the number of complex construction projects, such as high-density development and long-span mega structure construction, has been increasing globally. Therefore, the construction duration has become an even more important factor for success. Nevertheless, in domestic residential construction projects, it usually takes more time than twice as much as North American cases. The long construction duration causes a number of problems, for example growth of financial costs, fall in productivity, and weakness of competitiveness. If the framework construction duration can be shortened to 3 ~ 4 days, then it is also expected to complete the finish work of building in shorter duration, be led to reduce the entire construction duration, and eventually to save a great deal of indirect costs. For shortening the construction duration, previous researches pointed out that the development of simplified plan design should precedes. But, in reality, lack of experience of new design and innovative techniques tends to be the obstacle to wide adoption of the simplified plan design in construction fields. In this paper, a simplified structural plan design is proposed, and the construction cost is quantitatively compared between when traditional construction technique is applied to the traditional plan and when the duration-shortening key technique is applied to the developed plan.

• 한국건설관리학회논문집
• /
• 제22권5호
• /
• pp.48-54
• /
• 2021

고용노동부의 2020년 산업재해 사고 사망 통계 발표에 따르면 최근 5년간 발생한 업무상 사고 사망 재해의 절반 이상이 건설업에서 발생하고 있다. 그중 건설기계와 관련된 충돌 및 협착 사고가 사망 재해의 큰 부분을 차지하고 있다는 것을 알 수 있다. 정부는 건설 현장에서 발생하는 사고를 예방하기 위해 "건설안전특별법" 발의, 사고 예방을 위한 새로운 기술의 도입 장려 등 큰 노력을 기울이고 있지만, 여전히 건설 현장에서 수많은 안전사고가 발생하고 있다. 이에 본 연구는 초음파 스캐닝 기술을 통해 반경 내 대상의 종류와 위치를 인식하여 건설기계와 작업자 간의 충돌사고를 예방할 수 있는 기술을 개발했다. 본 연구는 파일럿 실험을 수행하였으며, 결과 분석을 통해 대상 인식과 위치 추정 모두에서 높은 정확도로 기술의 실현 가능성을 증명하였다. 개발한 기술은 건설 현장에서 발생하는 충돌사고를 예방하고, 자동화된 건설기계 충돌사고 예방 기술 개발에 이바지할 수 있을 것으로 기대된다.