| 摘要 |
PROBLEM TO BE SOLVED: To provide a reinforcement joint enabling a joint operation to be easily carried out while keeping strength of a steel bar and a connection part, and the steel bar and a sleeve used for the same.SOLUTION: A reinforcement joint connects steel bars by disposing a sleeve 3 at both ends of steel bars 1, 2 to be connected. The steel bars have enlarged diameter parts 11, 12, which are sufficiently enlarged so as to have a cross sectional area that is more than 1.5 times larger than nominal cross sectional area of the steel bars, at ends. Male screws 12, 22, which have effective cross sectional area that is 1.5 times or more larger than the nominal cross sectional area of the steel bar or/and screw area per pitch of 20% or higher of the nominal cross sectional area of the steel bar, are engraved at the enlarged diameter part. The sleeve is formed into a cylindrical shape. A female screw 31 that is screwed with the male screw is engraved at an inner diameter part of the sleeve. The sleeve has length that allows the male screw engraved at the enlarged diameter part of both steel bars to be screwed in 10 pitches or more from both ends.SELECTED DRAWING: Figure 1 |
