Reinforcing bar joint

Abstract

A reinforcing bar joint 1 includes a sleeve 2 having an elliptic section, and a wedging means 4 . The wedging means 4 is composed of wedge members 4 a , 4 b which are pressed into between reinforcing bars 5 a , 5 b . The press-in positions of these wedge members 4 a , 4 b are spaced away from each other so that the reinforcing bars 5 a , 5 b , the sleeve 2 , and the wedge members 4 a , 4 b are integrated in the area lying between the press-in positions. This can also move the points of action of tensile forces acting on the reinforcing bars outward, thereby increasing the distance between the points of action and reducing the amount of rotation of the sleeve 2.

1 . A reinforcing bar joint comprising:
 a sleeve having an elliptic section and openings in both ends, ends of a first reinforcing bar and a second reinforcing bar being insertable into said openings, respectively, so that the ends of the first and second reinforcing bars overlap each other by a predetermined length, the sleeve including at least a pair of opposed flat wall portions with wedge insertion holes formed therein, respectively; and   a wedging means to be inserted through said wedge insertion holes, and pressed into between said first reinforcing bar and said second reinforcing bar, said wedging means comprising a first wedge member to be inserted through ones of said wedge insertion holes positioned on a side of the end of said second reinforcing bar, and a second wedge member to be inserted through ones of said wedge insertion holes positioned on a side of the end of said first reinforcing bar,   said first reinforcing bar and said second reinforcing bar being main reinforcing bars for use in a reinforced concrete structure or a steel-reinforced concrete structure.   
   
   
       2 . A reinforcing bar joint comprising:
 a sleeve having an elliptic section and openings in both ends, ends of a first reinforcing bar and a second reinforcing bar being insertable into said openings, respectively, so that the ends of the first and second reinforcing bars overlap each other by a predetermined length, the sleeve including at least a pair of opposed flat wall portions with wedge insertion holes formed therein, respectively; and   a wedging means to be inserted through said wedge insertion holes, and pressed into between said first reinforcing bar and said second reinforcing bar, said wedging means comprising a first wedge member to be inserted through ones of said wedge insertion holes positioned on a side of the end of said second reinforcing bar, and a second wedge member to be inserted through ones of said wedge insertion holes positioned on a side of the end of said first reinforcing bar,   said first reinforcing bar and said second reinforcing bar being shear reinforcing bars for use in a reinforced concrete structure or a steel-reinforced concrete structure.   
   
   
       3 . The reinforcing bar joint according to  claim 1 , wherein said sleeve has a hardness relatively lower than those of said first reinforcing bar and said second reinforcing bar. 
   
   
       4 . The reinforcing bar joint according to  claim 3 , wherein said sleeve is annealed in a manufacturing process of the sleeve. 
   
   
       5 . The reinforcing bar joint according to  claim 2 , wherein said sleeve has a hardness relatively lower than those of said first reinforcing bar and said second reinforcing bar.