Mortar grout splice sleeve for reinforcing bars

Static structures (e.g. – buildings) – Machine or implement


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403269, 403305, E04C 516, F16B 702






The present invention relates to a mortar grout splice sleeve for reinforcing bars utilized for an end-to-end connection of opposite reinforcing bars used in a cast-in-place concrete construction method as well as in a precast concrete construction method.


In the cast-in-place concrete construction method, reinforcing bars are assembled to a building framework in the field of construction, in which a reinforcing bar often has an end thereof connected to an end of the other reinforcing bar. In the precast concrete construction method, precast concrete members are assembled to a concrete building in the field of construction, in which, in most, one precast concrete member has at least one sleeve therein connected with an end of the respective reinforcing bar projected from the other member. Sometimes, it is needed that the both precast concrete members have the opposite ends of their reinforcing bars connected with each other in the precast concrete construction methods.
The prior art mortar grout splice sleeve is able to connect the opposite ends portions of the both reinforcing bars. The mortar grout splice sleeve has a tubular shell, both openings formed in the opposite ends of the shell, and both seals mounted on the respective ends of the shell to seal the respective openings of the shell. When the sleeve is filled with mortar, the seals prevent the mortar from leaking out of the openings before the mortar hardens.
Conventionally, either of a cap-shaped seal and a disk-shaped seal has been adopted for sealing the opening formed in the end portion of the shell. Each of the cap-shaped and disk-shaped seals has a central bore to be fitted on the reinforcing bar.
The cap-shaped seal is resiliently expansible and formed to cover the end portion of the shell like a cap. Mostly, the cap-shaped seal is formed in the cylindrical portion thereof with a hole for fitting engagement with a grout port or exhaust port which is somewhat protruded from the tubular circumference of the shell.
The cap-shaped seal is mounted on the sleeve as follows: It is resiliently expanded in the extent that it fits on the end portion of the shell. Thereafter, its hole is resiliently expanded to fit on the port.
The disk-shaped seal is somewhat rigid and circular. The disk-shaped seal is mounted in a space formed on the outside end of the shell. The space is defined both by the outside hollow-circular end face of the shell situated somewhat inward from the endmost periphery of the tubular portion of the shell and by the internal circumference of the said endmost periphery. The space has an inner diameter slightly larger than the outer diameter of the disk-shaped seal. The shell is formed at its endmost periphery with at least a radially inward protrusion. The disk-shaped seal is formed at its peripheral part with at least a cut-off for axially fitting engagement with the radially inward protrusion of the space. The inward protrusion allows the disk-shaped seal to fit in and out of the space only when it is in alignment with the cut-off of the seal. The inward protrusion supports the seal in the space from outside to prevent the seal from dropping out of the space once the seal is fitted in the space and then rotated to have the cut-off axially apart from the inward protrusion.
The disk-shaped seal is mounted on the sleeve as follows: It is entirely fitted in the space with its cut-off axially aligned with the inward protrusion of the shell. Thereafter, it is partly rotated to have the cut-off turned apart from the inward protrusion.
However, it disadvantageously requires a somewhat fine finger work to mount either of the cap-shaped seal and the disk-shaped seal on the sleeve in the field of construction in which many reinforcing bars and frames are so overcrowded to prevent the finger work from being made on the sleeve between the opposite rein forcing bars.
The present invention is intended to provide an improved mortar grout splice sleeve of the type having easily mountable seals

patent: 4627212 (1986-12-01), Yee
patent: 5606839 (1997-03-01), Baumann


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