This technology is a precast column-to-foundation connection structure where the top of a tension member, passing through a rod installation hole in the precast column, is anchored to the top of the column, while the bottom ball joint is seated in a hemispherical mounting hole within a joint fastening block on the foundation.
Existing methods of securing precast columns that support bridge girders to foundations using steel tension rods suffer from moment reactions at the rod ends when horizontal forces act on the column. This subjects the rods to bending stress and deformation in addition to tension. The bent rods contact the sides of the insertion pipes, reducing the long-term durability of the column base and lowering overturning stability due to reduced fatigue resistance from repeated bending and buckling.
In this technology, the joint mounting hole is cylindrical at the bottom to allow the ball joint to pass through and hemispherical at the top to catch the joint, with a friction-reducing member placed between the curved surfaces. This allows the tension rod to rotate with the column if it tilts, ensuring it remains under pure tension. The support member and joint are threaded onto the tension rod, and the fastening block is secured to the foundation via bolt holes and nut seats arranged radially and symmetrically around the mounting hole. Applicable to precast pier-to-foundation connections, rapid construction of elevated road and railway substructures, and precast column structures in seismic zones, this method shortens construction time through simple bolting and prevents the tension rod from scraping or buckling against the column hole walls, thereby preserving joint fatigue life under repeated seismic loads.
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