| 摘要 |
PROBLEM TO BE SOLVED: To improve load-resistant performance by improving strength of load- resistant material used in various structures such as protective fences, road bridges, markers, street lamps, etc. SOLUTION: A steel pipe 2 having a circular cross section has a reinforcement body 3 integrated with it on the inside, so that a modulus of section of the steel pipe 2 is enlarged to increase stress to load. Simultaneously, wavy irregularities 6 continuous in a circumferential direction are formed on an inner circumferential surface in the reinforcement body 3, so that stress added to the steel pipe 2 is dispersed to improve stress to deformation or bend. When this load resistant material is used for columns, beams, piles, etc., in various structures, large load-resistant force can be provided. |
