Strength of Scaffolding Tie-Bar Anchors Fixed to ALC Panels

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  • TAKANASHI Seiji
    Construction Safety Research Group, National Institute of Occupational Safety and Health
  • OHDO Katsutoshi
    Construction Safety Research Group, National Institute of Occupational Safety and Health
  • TAKAHASHI Hiroki
    Construction Safety Research Group, National Institute of Occupational Safety and Health

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Other Title
  • ＡＬＣパネルにおける足場用壁つなぎ材アンカーの強度に関する研究

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Due to the fact that scaffolding is horizontally unstable, scaffolding collapse due to strong winds occurs frequently. As a countermeasure, scaffolding can be attached to a building using tie-bars. As the authors believed that scaffolding collapse due to strong winds was caused by failure of the tie-bars, several experimental studies to investigate their strength were carried out. Our studies indicated that tie-bars were sufficiently strong, leading us to the conclusion that tie-bars could be used safely. However, it became apparent that when construction was not performed with sufficient precision, there was a strong possibility of reduced tie-bar safety. In the present study, we tested experimentally the strength of a tie-bar fixed to an ALC panel. In the experiment, the compressive and tensile strength of four types of anchors were investigated. Results revealed that the strength of all anchors was considerably lower than that of the tie-bar. In fact, the strength of the anchors was less than 50% of the design strength of a tie-bar under almost all experimental conditions. Generally, in construction, the number of tie-bars is determined based on wind load and tie-bar strength. This study demonstrated that the number of tie-bars must be determined in conjunction with the strength of accompanying anchors.

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