To facilitate installation, storage and conveyance by fitting and connecting concrete products themselves through a connecting pin by way of putting an engaging piece resiliently into a coupler fitting hole, engaging a spanner with its hitch, and rotating the connecting pin into separation.
A connecting pin 1 is provided with an insert screwing thread 12 at its one end 11, and also claw pieces 14 and 14 being free of retractableness and projecting outward in the normal shaft orthogonal direction at the other end 13, respectively. In addition, a spanner hitch 15 is installed in an intermediate spot. This spanner hitch 15 is enough with only one but generally two units are axisymmetrically installed. An anchor screwing thread 22 is installed in one end 21 of a coupler 2, and a fitting hole 24 of the connecting pin 1 is opened in the other end 23. In addition, a sealant 7 is interposed between two concrete products 5 and 6, and this connecting pin 1 is fitted in the coupler 2, having it engaged to the claw pieces 14 and 14. Then, the spanner is engaged with the spanner hitch 15 from an interval between these two concrete products 7 and 8, and the connecting pin 1 rotated, taking off the engagement between these two claw pieces 14 and 14, and thus the connection is released.
MORISHIMA KAZUHIRO
FURUHASHI MASAYOSHI
JAPAN LIFE KK
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