• 한국안전학회지
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• 제35권4호
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• pp.23-31
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• 2020

In the construction sector, there were 99 fatalities from falls associated with steel tube and system scaffolds for three years from 2016 to 2018 and out of which 27.3 percent (27 workers) were found to have occurred during installing and dismantling procedure. To erect scaffolding which is installed for the work at height, the work platforms are generally installed first and the safety guardrails are installed and vice versa to dismantle. As a result, workers are exposed to the risk of falling because they erect and dismantle scaffolding without guardrails. To minimize the risk of falling, it is necessary to study a new construction method that can erect or dismantle scaffolding while guardrails are installed (called advanced guardrail system). This study analyzed advanced guardrail system in terms of safety regulation, workability and economic efficiency by investigating the domestic situation on the use of scaffolding, reviewing domestic and foreign standards for guardrails and conducting economic feasibility study. The results of this study is expected to greatly contribute to preventing falls in scaffolding installation and dismantlement procedure. As a follow-up study, empirical research is required including physical test of scaffolding with advanced guardrail system and effectiveness analysis after trial applications.

• 한국안전학회지
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• 제35권5호
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• pp.49-58
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• 2020

In domestic construction sites, when installing steel pipe scaffolding and system scaffolding, the guardrails are installed after the installation of the work platforms. This conventional guardrail system (CGS) is always exposed to the risk of falls because the safety railing is installed later. In order to prevent fall disasters during erecting and dismantling scaffolds, it is necessary to introduce the advanced guardrail system (AGS) which installs railings in advance of climbing onto a work platform. For the introduction of the AGS, the structural performance of the system scaffolding applying the CGS and the AGS was compared and evaluated. The structural analysis of the system scaffold (height: 31 m and width: 27.4 m) with AGS confirmed that structural safety was ensured because the maximum stress of each element of the system scaffolding satisfies the allowable stress of each element. As a result of performance comparison of CGS and AGS for each element, the combined stress ratio of vertical posts in AGS was 6.4% lower than that of CGS. In addition, in the case of ledger and transom, the combined stress ratios of AGS and CGS were almost the same. The compression test of the assembled system scaffolding (three-storied, 1 bay) showed that the AGS had better performance than the CGS by 9.7% (8.91 kN). The cross bracing exceeds the limit on slenderness ratio of codes for structural steel design. But the safety factor for the compressive load of the cross bracing was evaluated as meeting the design criteria by securing 3 or more. In actual experiments, it was confirmed that brace buckling did not occur even though the overall scaffold was buckled. Therefore, in the case of temporary structures, it was proposed to revise the standards for limiting on slenderness ratio of secondary or auxiliary elements to recommendations. This study can be used as basic data for the introduction of AGS for installing guardrails in advance at domestic construction sites.

• 한국건축시공학회지
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• 제20권5호
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• pp.471-480
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• 2020

국내 산업재해는 점진적으로 감소하고 있음에도 불구하고 건설업에서의 사망자는 전체 산업의 49.9%를 차지하고 있으며, 그 중 추락사고 사망자는 59.7%의 높은 비중을 차지하고 있다. 이에 따라 정부차원에서 건설업의 추락사고를 예방하기 위한 다양한 안전 활동 및 정책을 추진하고 있으나 그 효과는 미비한 실정이다. 반면 미국, 일본, 영국, 싱가포르 등 해외 선진국의 경우 각국의 상황에 적합한 안전 활동, 규제 및 정책 등을 펼친 결과, 국내보다 산업재해 발생율이 저조했다. 따라서 본 연구의 목적은 국내 산업안전보건법과 해외 선진국의 법령을 추락재해에 밀접한 영향을 미치는 기인물별로 비교·분석하여 국내 실정에 맞는 개선방안을 제시하는 것이다. 비교 분석 결과, 본 연구에서는 국내 건설현장의 추락재해 저감을 위한 개선방안으로 1)추락 높이에 대한 기준 개선 2)안전난간 상부난간대 높이의 개선 3)수평안전대 부착설비 연구 및 지침의 개정 등의 개선방안을 제시하였다. 향후 본 연구는 해외 선진국의 사례분석을 위한 기초자료로 활용될 것이다.