Un manguito de junta de refuerzo, cuyas aberturas en ambos extremos, sirven como puertos de inserción de ia barra de refuerzo, comprende aberturas proporcionadas en ia pared lateral, con un puerto de descarga más pequeño que el puerto de inyección, ambos con forma de un cilindro de inyección y un cilindro de descarga

Un manguito de junta de refuerzo, cuyas aberturas en ambos extremos, sirven como puertos de inserciôn de la barra de refuerzo, entre la abertura de ambos extremos se proporciona un espacio de disposicion para ambas barras de refuerzo que han sido insertadas a través de los puertos de inserción de la barra de refuerzo y un espacio de llenado para un material de carga adaptado para fijar ambas barras de refuerzo entre los extremos principales de ambas barras de refuerzo y entre la periferia de ambas barras de refuerzo y la pared interna cilindrica. In a reinforcement joint sleeve that openings on both ends serve as reinforcing bar insertion ports, an arrangement space for both reinforcing bars which have been inserted through the reinforcing bar insertion ports and a filling space for a filler adapted to fix both of the reinforcing bars between leading ends of both of the reinforcing bars and between the periphery of both of the reinforcing bars and a cylindrical inner wall are provided between the openings on the both ends, and a filler injection port is provided in a one-end side sidewall and a filler discharge port is provided in an other-end side sidewall, the discharge port is made smaller than the injection port, as openings provided in the sidewall, the injection port and the discharge port are respectively in the form of an injection cylinder and a discharge cylinder each of which forms a cylindrical vertical wall which projects from the sidewall so as to surround each opening and effective inner diameter sizes of both of the cylindrical vertical walls are made the same to each other.