| 摘要 |
PROBLEM TO BE SOLVED: To use for connecting a matter to be attached, an attaching matter and a concrete secondary product comprising a concrete side ditch block, a U-shaped ditch block, covers covered on their upper faces a constituent block material in which a large sized closed conduit or the like is divided into some parts, construction materials such as a column material, a beam material and a slab in a drain ditch as civil engineering materials. SOLUTION: The coupling device comprises first and second substantially cylindrical insert members 2A, 2B provided on a matter to be attached N and an attaching matter P, and a locking pin body 5 providing a first pressurization oblique face part 5a on the edge side and providing a second pressurization oblique face part by separating a desired distance l1 from the pressurization oblique face part. Pressurization force is received from the first pressurization oblique face part by the hit of the first stage of a locking pin body, a first pressure receiving oblique face part in which one end side is lockably enlarged and deformed in the first insert member is provided in the inside, the pressurization force of a second pressurization oblique face part is received on a pressure receiving part 6d by the hit of the locking pin body of a second stage and a locking cylinder 6 in which the other end side is lockably enlarged and deformed in the second insert member is provided.
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