• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2010년도 춘계 학술논문 발표대회 1부
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• pp.165-166
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• 2010

In this study, it was accomplished to analyze the productivity and manpower through the activity of rebar work for the application of rational construction cost in apartment house. And the rebar work is very important in the view of the expense and safety, and durability in the construction of R/C structure. Also the rebar work is very affected with productivity owing to the lack of manpower and materials cost rise.

• 한국건축시공학회지
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• 제23권3호
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• pp.315-326
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• 2023

The design principles and implementation of rebar lap splice in architectural structures are governed by building regulations. Nevertheless, the minimization of rebar-cutting waste (RCW) is often impeded by the mandatory requirements pertaining to the rebar lapping zone as prescribed in design codes. In real-world construction scenarios, compliance with these rules often falls short due to hurdles concerning productivity, quality, safety, time, and cost. This discrepancy between code stipulations and on-the-ground construction practices necessitates an academic exploration. The goal of this research was to delve into the effect of rebar lap splice placement on the robustness and constructability of building edifices. The study initially took on a review of the computation of rebar lapping length and the rules revolving around the lapping zone. Following this, a structural robustness and constructability examination was undertaken, focusing on adherence to the lap splice zone. The interpretations and deductions of the research led to the following insights: (1) the efficacy of rebar lap splice is not solely contingent on the moment, and (2) the implementation of rebar lap splice beyond the specified zone can match the structural integrity and robustness of those confined within the designated area. As a result, the constraints on the rebar lapping zone ought to be revisited and possibly relaxed. The conclusions drawn from this research are anticipated to reconcile the disconnect between building codes and practical construction conditions, furnishing invaluable academic substantiation to further the endeavor of achieving near-zero RCW.

• 국제학술발표논문집
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• The 8th International Conference on Construction Engineering and Project Management
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• pp.13-22
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• 2020

Reinforcement steel fixing is a skilled and manually intensive construction trade. Current practice for the quality assessment of reinforcement steel fixing is normally performed by fabricators and has high potential in having errors due to the tedious nature of the work. In order to overcome the current inspection limitation, this study presents an approach that provides visual assistance and inspection enhancement for inspectors to assess the dimensional layout of reinforcement steel fixing. To this end, this study aims to establish an end-to-end framework for rebar layout quality inspection using laser scanning and Augmented Reality (AR). The proposed framework is composed of three parts: (1) the laser-scanned rebar data processing; (2) the rebar inspection procedure integrating with AR; and (3) the checking and fixing the rebar layout through AR visualization. In order to investigate the feasibility of the proposed framework, a case study assessing the rebar layout of a lab-scaled formwork containing two rebar layers is conducted. The results of the case studies demonstrate that the proposed approach using laser scanning and AR has the potential to produce an intuitive and accurate quality assessment for the rebar layout.

• 한국건축시공학회지
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• 제23권4호
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• pp.485-496
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• 2023

Precise construction cost estimation is paramount to determining the total construction expense of a project prior to the initiation of the construction phase. Despite this, manual quantification and cost estimation methods, which continue to be widely used, may result in imprecise estimation and subsequent financial loss. Given the fast-paced and efficiency-demanding nature of the construction industry, trustworthy quantity and cost estimation is essential. To mitigate these obstacles, this research is focused on establishing an automated quantity estimation algorithm, particularly designed for the main rebar of beams which are recognized for their complicated reinforcement configurations. The exact quantity derived from the proposed algorithm is compared to the manually approximated quantity, reflecting a variance of 10.27%. As a result, significant errors and impending financial loss can be averted. The implementation of the findings from this research holds the potential to significantly assist construction firms in quickly and accurately estimating rebar quantities while adhering strictly to applicable specifications and regulatory requirements.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.89-90
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• 2023

This dissertation investigates the feasibility of accurately calculating the required rebar length using BIM-based shape codes and the potential benefits of such an approach in terms of cost reduction, waste reduction, and environmental improvement. The study aims to explore the possibility of automatically calculating slab rebar length before construction to reduce rebar cutting waste and cost. The results of this study will provide insights into the potential of using shape codes to reduce rebar cutting waste and cost in building frame construction.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 춘계 학술논문 발표대회 학계
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• pp.243-246
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• 2009

Importance of quality control is gradually increasing in the construction. And the reber work is very important things which influence in safety and durability of the building and accounts for about 9.8% of the total cost. Although reber work is important, quality control of the rebar work is still performed by attitude and experience of worker. Therefore, it is very important to quality achievement effort and quality standards recognition of rebar worker for quality sophistication in the construction. Some papers have dealt with the quality control in construction. But there was no study for actual conditions of quality standards recognition of rebar workers. The purpose of this study is to survey the actual conditions of quality standards recognition of rebar workers and to analyze difference of consciousness of administrator and worker. The result are : there id difference of consciousness of worker and administrator, workers work without knowing quality standard.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.15-16
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• 2013

Because of the complicated shape and the overcrowded arrangement of rebar, there are some problems in applying the rebar modulation for the Nuclear Power Plant Structures. In order to resolve these problems, we have been studying the rebar modulation method applying techniques of the high strength rebar for NPP Structure. After reviewing the rebar drawing of the NPP structures and performing the mock-up test, the rebar modulation method in the various area of the NPP Structure has been established. I will introduce this method and the future plan of the research.

• 한국건설관리학회논문집
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• 제10권6호
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• pp.58-66
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• 2009

최근 국내 건설업은 기능인력의 부족, 건설경기의 침체 등으로 인하여 원가절감 등을 통한 수익성 확보의 필요성이 증대되고 있다. 철근공사는 구조물의 안전성과 내구성에 많은 영향을 미치고 원가측면에서도 매우 중요한 공사임에도 불구하고, 노동 집약적인 특성을 그대로 유지하고 있어 철근 자재의 손실에 따른 원가 상승의 문제가 매우 심각하다고 할 수 있다. 철근공장 가공은 철근의 절단 및 절곡작업을 자동화 시설을 갖춘 공장에서 실시하여 현장에 반입하는 것으로 가공된 철근의 품질이 우수하고, 철근 자재의 손실도 절감할 수 있는 장점이 있다. 그러나 이와 같은 기대효과에도 불구하고 철근 공장가공 방식은 1990년대 중반에 국내에 도입된 이후 현재까지 활성화되지 못한 실정이다. 본 연구에서는 철근 가공 공장에 대한 실태조사를 수행하고, 그 조사결과를 토대로 철근공장가공 정착을 위한 방안으로 철근 가공 표준을 제안하였다.

• 한국건설관리학회논문집
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• 제25권2호
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• pp.69-80
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• 2024

Currently rebar spacing inspection is carried out by human inspectors who heavily rely on their individual experience, lacking a guarantee of objectivity and accuracy in the inspection process. In addition, if incorrectly placed rebars are identified, the inspector need to correct them. Recently, laser scanning and AR technologies have been widely used because of their merits of measurement accuracy and visualization. This study proposes a technology for rebar spacing inspection and fixing by combining laser scanning and AR technology. First, scan data acquisition of rebar layers is performed and the raw scan data is processed. Second, AR-based visualization and fixing are performed by comparing the design model with the model generated from the scan data. To verify the developed technique, performance comparison test is conducted by comparing with existing drawing-based method in terms of inspection time, error detection rate, cognitive load, and situational awareness ability. It is found from the result of the experiment that the AR-based rebar inspection and fixing technology is faster than the drawing-based method, but there was no significant difference between the two groups in error identification rate, cognitive load, and situational awareness ability. Based on the experimental results, the proposed AR-based rebar spacing inspection and fixing technology is expected to be highly useful throughout the construction industry.

• 한국건축시공학회지
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• 제22권6호
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• pp.531-542
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• 2022

건물의 초고층화에 따라 구조재료의 강도 증가와 철근의 배근량이 증가할 뿐만 아니라 철근의 시공과정에서 적절한 이음방식의 사용이 필수적인 요소 중 하나이다. 본 연구에서는 철근 커플러이음의 시공품질 확인실태를 전문가 설문을 통해 파악하고, 실제 현장 시공과 유사한 시험체에 대한 품질시험을 통해 적정 품질 확인방안을 제시하고자 한다. 시험결과 설문조사 결과에서 나온 품질확인 방법 중 커플러 조임방법과 상하 두 철근의 맞댐 정도 등이 시험체 강도에 영향을 주지 않는다는 결과를 얻었다. 따라서 철근과 커플러의 나사산 개수를 계산치보다 여유를 두고 제작하고, 현장 시공시 나사산이 완전히 조립되었는지 확인하는 것이 적절한 커플러 품질 확인방법으로 사료된다.