Pile connecting structure

摘要

A connecting plate (5), arranged at the juncture of upper and lower piles (1,3), has a diameter identical to that of both piles. Bolts (6) are entered into circular bolt insertion holes on the connecting plate and the bolt insertion holes (41) on the end plate (2) of the lower pile. The bolts (7), protruded downward from the end plate (2) of the upper pile, have bolt heads inserted into the large diameter parts of the heteromorphic bolt insertion holes on the end plate (4). The bolts (7) are allowed to shift between the large and small diameter parts of these heteromorphic bolt insertion holes. Each small diameter part is sized to discourage insertion of the bolt head.