| 摘要 |
PROBLEM TO BE SOLVED: To provide a grating with a natural wood resisting a traffic accident, which has not been attained in a conventional wooden grating, because a cost is increased and products are not practical although there are the product, in which a square lumber is enlarged for resisting a load, the product using an especially hard wood, the product, in which a round lumber is installed on the top face of the grating made of steel or the like in the conventional wooden grating. SOLUTION: Notched sections are formed to wood on the top face of a ladder-shaped steel material and L-shaped or T-shaped shape steel is inserted, and long-sized bolts 9 are penetrated, and the shape steel is clamped by the bolts 9 and connected by using a fastener from the underside of the shape steel. COPYRIGHT: (C)2005,JPO&NCIPI
|
