건설공사 유지보수품셈 사례조사 연구

안방율 ( An Bang-yul ),박태일 ( Park Tae-il ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1

Lots of infrastructures have been newly constructed through the rapid economic growth of 1970’s. Since the infrastructures has mostly deteriorated and this circumstance makes the need for maintenance and rehabilitation(M&R) of infrastructures to obtain the convenience and safety of users even more essential. Although markets for M&R project become larger, the construction standards for cost estimation of M&R work are insufficient. Thus, the purpose of this study is to examine the present state of standards for cost estimation of M&R works using case studies. Finally, this work could be utilized as the basis for the development of national standard for cost estimation of M&R work.

산업안전보건관리비 계상기준 개선방안 연구

안방율 ( An Bang-yul ),송태석 ( Song Tae-seok ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1

Occupational Safety and Health Management Cost, used to protect workers in Korean construction worksites and to create safe working environments, is a legally managed expense item. As this cost item is grounded on the Occupational Safety and Health Act, it is always implemented. However, because there is a ceiling on its rates, insufficient amounts of Safety Management Costs are often allocated to worksites, with the money not being used to areas essential to worker safety. As such, the current study raises the need to develop a set of standards to enable some items under the Occupational Safety and Health Management Costs―appropriated under the rate of indirect costs―to be appropriated as direct construction costs. As a preliminary step in this effort, the current study will provide basic data that can be used to create construction cost calculation standards for items that can be calculated as direct construction costs.

표준품셈 관부설 및 접합공사 품 개정 요인 분석

오재훈 ( Oh Jae-hoon ),안방율 ( An Bang-yul ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1

This study analyzed the major revision factors and revision contents for ‘Construction-Standard-Production-Rate for Construction Works in 2018. Part 16. Pipe Laying Down and Connection” which was revised by the construction expense estimation standard’s middle and long-term plans. The main reasons for the revision was analyzed to be unclear construction scope, limitations in applicable pipe material based on the facility type, labor force mainly composed of ordinary workers, limitations of labor force, and incomplete appropriation standard for the tool rent fee and equipment expenses. Through revision of factors, common items were newly established, organization was revised, the labor force was mainly composed of the technicians, and basis for appropriation of equipment expenses was arranged. In addition, through periodic revision, the appropriation standard for bend and special pipes was set. Consequently, more practical construction cost estimate standard is arranged through revision.

철근콘크리트 공사비산정기준 개정요인에 관한 연구

송태석 ( Song Tae-seok ),안방율 ( Ahn Bang-yul ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1

Reinforced concrete is the most widely used construction method for constructing structures. There is a lot of process for constructing Reinforced concrete structures such as installing rebars, molds and support, mixing and placing concrete, and curing. So the reinforced concrete work accounts for a large part of the total construction cost for constructing structure. For this reason a reasonable standard for estimating the cost of reinforced concrete construction has to be established and it will be possible to secure appropriate costs for construction work. In this study, we analyze the revision factors of the standard for estimating the cost of reinforced concrete construction and present them to secure reasonable construction costs.

소규모 시공현장 적정공사비 확보를 위한 원가기준 마련 연구

오재훈 ( Oh Jae-hoon ),안방율 ( An Bang-yul ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1

In construction sites, small-scale construction quantities or limited work hours below the daily work volume may occur due to on-site conditions. For small-scale quantities, the input of equipment and labor is designed based on an hourly basis in the invoice, resulting in a difference from the actual cost. In this study, we aim to explore solutions from the perspective of construction cost standards to secure appropriate construction costs for small-scale and time-limited construction sites. Firstly, to preserve the basic construction costs on-site, we established standards where half the cost would be charged for construction quantities below four hours and a full day’s cost would be designed for construction quantities between four to eight hours. Additionally, realistic construction cost calculation standards are expected to be provided by realizing a surcharge rate for work hour limitations to secure appropriate construction costs.

적정공사비 산정을 위한 공사비할증기준 분석

오재훈 ( Oh Jae-hoon ),안방율 ( An Bang-yul ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1

In order to calculate construction costs properly, it is necessary to add the weight that reflects different worksite conditions. The implementation of the weight, however, is difficult because it is impossible to determine whether wight should be added in basic work or whether weight values are overlapped. Special worksite conditions further complicate the matter. Furthermore, overlapping implementation of weight values result in overestimation of construction costs. The current study clearly analyzed the weight value items in the current construction cost calculation standards, and analyzed the weight value items included under the basic productivity category to propose an improvement of weight standards. Basically, the estimating standards provide 140 weight value items, with different levels of weight given to each item. Among 1,333 items in the estimating standards, 140 include weight values. Some items have two types of weight values.

현장 시공실태에 따른 철근공사 공사비산정기준 개선 연구

송태석(Tae-Seok Song),안방율(Bang-Yul Ahn),오재훈(Jae-Hoon Oh),이한수(Han-Soo Lee) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.11

철근콘크리트공사 공법은 건축물, 교량, 터널 등의 구조물의 골조를 시공하는데 가장 보편적으로 활용되고 있는 공법이다. 특히 철근공사는 건설공사 공사비 비중이 가장 큰 공종 중 하나로 철근 공사비의 변동에 따라 전체 건설 공사비가 영향을 받고 있어 적정한 건설 공사비산정을 위해서는 합리적인 공사비 산정기준이 필요하다. 본 연구에서는 현장 실태조사 및 내역서 분석을 통해 적정한 철근 공사비를 확보할 수 있는 기준을 제시하고 그 영향성을 분석해보았다. 먼저 기존 공사비 산정기준의 실태와 실제 현장 적용실태를 비교 분석하여 기존 철근 공사비 산정기준의 문제점을 도출하였다. 총 29개의 현장을 대상으로 구조물의 종류, 현장 여건, 철근 규격, 공장가공과 현장가공 등에 따른 가공 및 조립의 적용실태 확인 및 생산성 분석을 수행하였다. 본 연구를 통해 현장시공 실태가 반영된 합리적인 공사비 산정기준이 제시되었으며, 철근콘크리트공사 적정공사비 확보에 일조할 것으로 기대된다. The reinforced concrete construction method is the most commonly used method for constructing structures, such as buildings, bridges, or tunnels. In particular, reinforcing bar work form the largest part of the cost of construction work. Because the overall construction cost is affected by the fluctuations in the cost of reinforcing bar work, it is necessary to develop reasonable standards. This paper presents the standards for calculating the cost of reinforcing bar work. The effects were analyzed by investigating the status at the site and analyzing written details. This study derived problems in the existing standards for calculating the cost of reinforcing bar work by analyzing existing standards for estimating construction costs and how they are applied at the site. This research carried out field investigations on 29 construction sites and analyzed the construction productivity of rebar processing and assembly according to the structures, site conditions, rebar specifications, or factory or site processing. Based on the field investigation results, this research established a revision to the standards for calculating the cost of reinforcing bar work reasonably. It is expected that this will contribute to estimating the cost of reinforced concrete construction appropriately.

미장공사의 품기준 변화 요인에 관한 연구

오재훈 ( Oh Jae-hoon ),안방율 ( An Bang-yul ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1

The plater work in the standard of estimate presents a variety of construction types. However, there is a part that does not fit the change of specification standards and on-site construction status, and it was revised in 2019's standard of estimate. In this study, we analyzed in detail the factors affecting the changes in estimating standards in the plater work. There were changes in the specification standards previously presented as primary coat, secondary coat, and formal coat as well as changes in on-site construction status such as thickness according to the number of plastering. Therefore, it is analyzed that the estimating standards can be classified by the number of finishes according to the site conditions by reflecting the analysis of the specification standards and site application status, and suggesting the finishing standards according to the number of plastering.

현장실태 조사를 통한 가로수전정 원가기준 마련 연구

오재훈 ( Oh Jar-hoon ),안방율 ( Ahn Bang-yul ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1

Pruning is the most important work for the growth and aesthetics of street trees. It is also the most actively conducted maintenance work. However, the specifications, application methods, and cost criteria for pruning have not been systematically established. This has recently caused a lot of confusion in the practice of street tree pruning, such as indiscriminate pruning and lack of construction costs. Therefore, this study clarified the contents of work according to the form of pruning. It added 'aesthetic pruning,' which takes into account design. In addition, It revised equipment not in conformity with the law and excluded personnel necessary for on-site traffic control so that they could be reflected separately. As a result, this study is expected to contribute a lot to securing appropriate construction costs for maintaining street trees.

도로포장 유지보수 공사비산정기준 개정에 대한 연구

오재훈 ( Oh Jae-hoon ),안방율 ( An Bang-yul ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1

Unlike new construction projects, road paving maintenance work shows large productivity discrepancies depending on the conditions of the worksite. The current construction cost calculation scheme, however, only provides daily construction volume categorized by work scope and scale: There are no detailed standards that can be implemented on various types of worksites. To develop standards that enable the calculation of appropriate construction costs by taking into account worksite conditions, the current study conducted on-site surveys and interviews. The on-site research and analysis revealed that location, construction width, the day's worksite lot, work scope, and construction objectives were found to cause differences in construction volume. In addition to the existing work scope and work scape variables, the current study added weight constants reflecting the daily work volume based on movement conditions at site and the size of the worksite lot. In this process, the current study found that even one type of construction project can have fifteen different levels of daily construction volume. Such detailed classification was deemed to enable the proper calculation of construction costs based on worksite conditions.