• Magazine of the Korea Concrete Institute
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• v.14 no.5
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• pp.15-20
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• 2002

갱폼이라 함은 주로 고층 아파트에서와 같이 평면상 상ㆍ하부 동일 단면 구조물에서 외부벽체 거푸집과 거푸집 설치ㆍ해체작업 및 미장ㆍ치장(견출) 작업발판용 케이지(cage)를 일체로 제작하여 사용하는 대형 거푸집을 말한다. 여기서 케이지는 갱폼에서 외부벽체 거푸집 부분을 제외한 부분으로 거푸집 설치ㆍ해체작업, 후속 미장, 치장(견출) 등 작업을 안전하게 수행하는데 필요한 작업발판, 안전난간 등으로 구성되어 갱폼 거푸집에 결합된 부분이며, 상부 케이지는 갱품 케이지의 4단 작업발판 중 거푸집 설치ㆍ해체작업용으로 사용되는 상부 2단 작업발판 구성 부분이고, 하부 케이지는 미장ㆍ치장(견출) 작업용으로 사용되는 하부 2단 작업발판 구성 부분을 말한다.(중략)

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.387-391
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• 2007

A proper selection of formwork greatly affects project success in tall building construction. The tall building construction, however, has not been selected properly using the characteristics by formwork and demands the comprehensive consideration of cost, duration, quality, safety, and environment. Therefore, this study compares and analyzes the application by formwork of five aspects. In order to perform an analysis, the questionnaire was performed to research the priority order of management as determining formwork and application by formwork of tall building construction engineers. This study is expected to help reasonable selection of formwork.

• Magazine of the Korea Concrete Institute
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• v.5 no.1
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• pp.175-181
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• 1993

콘크리트 구조체공사의 가장 큰 영향을 미치는 것은 거푸집공사이며, 구조체공사의 합리적 관리는 거푸집공사의 작업생산성에 관한 기초자료를 확보함으로써 가능하다. 본 연구에서는 거푸집공사의 과학적 관리기반을 구축하기 위하여, 구조체 기준층을 대상으로 작업측정을 하여 유로폼공법, 재래식 거푸집공법 등 주요공법의 생산성을 도출하였다. 또한, 거푸집공사의 주요 작업인 조립, 해체, 운반등 단위 공정의 소요작업 품을 산출함으로써, 작업개선을 위한 실용적인 자료를 제시하였다. 마지막으로 거푸집 면적이 생산성과 상관관계가 매우 높다는데 착안하여 소요작업품을 예측할 수 있는 상관관계식을 유도함으로써, 공정관리 및 기능공의 수급예측이 가능토록 하였다.

• Magazine of the Korea Concrete Institute
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• v.14 no.5
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• pp.27-30
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• 2002

ACS(Automatic Climbing System) 거푸집은 당 현장에서 코어 월 철근 콘크리트 공사시 사용되는 대형 거푸집으로써 상대 플로우 잭에 의해 자동으로 1개 층씩 상승되는 시스템으로 안전난간 및 안전발판을 설치하여 추락, 낙하재해에 대비하였으며 외부에 천막을 설치하여 비산먼지, 소음 등을 방지할 수 있도록 설치/운영 중이다. (그림 1)은 ACS 거푸집의 구성을 나타내었다.(중략)

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1999.06a
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• pp.187-191
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• 1999

공사현장에서 사용하고있는 거푸집의 대체를 오랫동안 연구 끝에 가로(60cm) 세로(120cm)의 규격의 PE-FORM을 개발한바 있으나, 일반 건설 현장에서 어떠한 형태의 구조물 시공을 위한 형틀을 제작함에 있어 통상적으로 기존 합판거푸집을 사용하고 있으나, 현재 국내에서 사용되고 있는 합판은 전량 수입에 의존하고 있어 외화낭비가 심할 뿐 아니라 평균 2-3회 정도밖에 사용하지 못해 자원 낭비를 초래하고 있으며, 합판 거푸집을 사용한 경우, 목공이 구조물의 형태에 맞춰 FORM을 일일이 제작해야하므로 시간과 비용의 소모가 크고 또한 FRP-FORM, EURO-FORM, STEEL-FORM GANG-FORM SYSTEM-FORM 등 구조물의 성격 형태에 따라 각종 개량된 거푸집을 사용한다고 해도 그것은 단순한 구조물의 형상을 만들어 내기 위한 형틀로써만이 이용되고 있을 뿐, 그 이상의 목적으로는 활용 할 수 없기 때문에 구조물의 특성상 방수 방식의 기능이 요구될 경우, 거푸집 해체 후 벽체의 내부 또는 외부에 액체, 몰탈, 에폭시, 쉬트 방수등 별도의 후속 공정이 추가되 번거로움이 있는 반면, 그 효과는 기대에 크게 미치지 못하고 있는 점을 착안, 수년 전부터 연구에 착수, 콘크리트 구조체의 방수ㆍ방식 문제를 해결 할 수 있는 획기적인 공법의 PE-PANEL의 요철형 거푸집 및 방수ㆍ방식공법을 개발해내는데 성공함으로써 지금까지 난제로만 여겨졌던 목재 거푸집의 대체 자재개발과 아울러 거푸집 겸 콘크리트 표면의 마감 처리을 동시에 해결한 매우 혁신적인 신기술이라 할 수 있다. (중략)

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.1
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• pp.19-28
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• 2018

The time for form removal is an important factor for ensuring the safety and economical efficiency of concrete structures, because it affects the quality, period, and cost of construction. Although local specifications suggest the form curing time, there is a problem of low quality of concrete due to early removing of form. This is because they do not fully understand effect of curing condition, and they want to shorten construction period in the field. Therefore, this research evaluates the effect of curing condition according to the time for form removal by testing specimen. As a result, the concrete compressive strength at the age of 28 days decreased about 40% in the condition of form removal after 12 hours, while the strength in the condition of form removal after 28 days decreased about 7%. Finally, this paper suggests an estimating equation for the concrete compressive strength due to the time for form removal considering various curing temperatures as equivalent ages. The proposed equation can be used in the field for evaluating the strength after form removal.

• Journal of the Korea Institute of Building Construction
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• v.10 no.4
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• pp.49-57
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• 2010

Selecting an appropriate formwork to fit the construction of a high-rise building is an important factor that can influence the success or failure of a construction. Currently, however, the reality is that in domestic high-rise building construction, the selection of an appropriate formwork with consideration of the characteristics of the formwork has not been done in a reasonable manner. To select formwork in a systematic and reasonable fashion, comprehensive consideration is required that must not only include the aspect of construction costs, but also air, quality, safety, and environmental issues. Therefore, this study aims to rationalize the selection process of formwork by applying the scientific method of Analytic Hierarchy Process (AHP) to the selection process of formwork, in terms of construction costs, quality and safety. To do this, the researcher investigated the current status of formwork being used in high-rise residential building construction. Then, based on the results of this investigation, the researcher selected an alternative for the formwork, and taking construction experts as the subjects of this study, conducted a survey on the applicability of the formwork as well as the priority of management thereof when selecting formwork. It is judged that the results of this research will contribute a more scientific and reasonable decision-making process than the existing non-scientific method in selecting formwork for high-rise residential building construction.

• Journal of the Korea institute for structural maintenance and inspection
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• v.21 no.4
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• pp.132-139
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• 2017

In this study, in order to prevent the frost damage of the concrete, the characteristics of the form using heating sheet utilizing the chemical reaction of quicklime and the insulation were evaluated through experiments at low temperature. In the case of form at $-10^{\circ}C$, the form with attached heating sheet showed a temperature history of more than $10^{\circ}C$ higher than that of wood form at the early of concreting due to heat of the quicklime in the heating sheet. In the case of the insulated form, the concrete was kept at a high temperature by preserving the hydration heat. When the heating sheet and the isopink(extruded polystyrene) were attached together on the form, the effect was the same as that of the vacuum insulation. The compressive strength of the form with vacuum insulation and form with isopink, heating sheet as measured about 5 MPa at age 3. The experimental in Mongolia, as with the pervious results, the form with the heating sheet and the insulation showed the highest temperature history over $25^{\circ}C$ for 48 hours. Therefore, it was confirmed that the heating sheet and insulation are attached to the form, which helps the concrete strength development at low temperature by heat generation and the insulation effect.

• Journal of the Korea Concrete Institute
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• v.13 no.6
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• pp.536-543
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• 2001

Nowadays, with high-stoned and large-sized of structures, high-strength concrete is applicable to various methods. When high-strength concrete is used jointly with system form, seizing on the development of compressive strength at early age is very important in aspect of construction process. Because system form is stripped more faster than ordinary form. But, we have little data of compressive strength before system-form is stripped, and it isn't yet established that decision criterion of the time when system-form is stripped. So this paper deals with the development of compressive strength at early age before system-form is stripped. In this study, the experimental results indicate the boundary of curing temperature and mixing factor that is able to get needful early-strength in the application of slip-form method, and curing temperature must be kept over 15 degrees in winter season.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.499-505
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• 2021

The purpose of this study is to investigate experimentally the physical/chemical properties of concrete surface according to types of formworks. Plywood formwork and coated plywood formwork were prepared. In addition, plywood formwork with sand paper was prepared to simulate deterioration of concrete or rough surface of concrete. Normal concrete was used in this study. The properties of concrete surface were investigated by visual inspection, scanning electron microscopy and energy-dispersive X-ray spectroscopy techniques, elemental mapping, 2D and 3D surface profile measurement, and zeta potential measurement. Test results showed that concrete in a coated formwork had smooth surface and concrete in the formwork with sand paper had rough surface. It was observed that properties of concrete surface depended on types of formworks. Furthermore, differences in surface roughness were significantly higher than those in chemical compositions and zeta potential.