Study on temporary investigation of bearing capacity and reinforce method of in-situ ground for prevention of overturning accidents of construction machineries.

2015 Fiscal Year Final Research Report

• Project/Area Number: 25750141
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Social systems engineering/Safety system
• Research Institution: National Institute of Occupational Safety and Health, Japan
• Principal Investigator: Hori Tomohito 独立行政法人労働安全衛生総合研究所, 建設安全研究グループ, 主任研究員 (20508634)
• Co-Investigator(Renkei-kenkyūsha): TAMATE Satoshi 独立行政法人 労働者健康安全機構, 労働安全衛生総合研究所, 部長代理 (10344243)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 大型建設機械 / 敷鉄板 / 地盤の仮設補強 / 簡易地盤調査法

Outline of Final Research Achievements

Drill rigs and mobile cranes are heavy machinery used in construction sites. Sufficient bearing capacity is required in the supporting ground to keep the machinery horizontal. However, overturning accidents frequently occur because of ground penetration at the foundations. This study set out to determine the optimum layout of a steel plate to prevent accidents involving the overturning of machinery. Loading tests using a 1/10-scale model of the steel plate were performed, to investigate the decrease in the pressure acting on the bearing ground. It was found that the reduction in the pressure acting on the ground differed depending on the positioning of the steel plate.
In addition, bearing capacity testing (BCT) method was newly developed. Several sets of BCT and PLT (existing methods) were conducted in various conditions of grounds to compare the results. It was ascertained that an almost identical relationship between loading stress and settlement are obtained from both the tests.

Free Research Field

社会安全