Direct Answer
A column splice is a field connection joining two sections of a multi-story column at a splice point, typically located 2–4 feet above a finished floor level. Splices allow columns to be manufactured and shipped in manageable lengths (typically 2–3 stories) and joined in the field using bolted or welded splice connections.
Full Explanation
Common column splice types: direct-bearing splice (ends milled flat, bolted flange plates carry tension, bearing transfers compression), welded splice (CJP welds at flanges and web), and all-bolted splice (bolted flange and web plates). The engineer selects the splice type based on the forces at the splice location. Direct-bearing splices are the most economical for columns with high axial load and low moment; welded splices are used where tension or moment controls. Splice location height is set by the engineer to clear the floor slab and provide adequate erection access.
What This Means for Your Shop
Column splices require milled bearing surfaces if a direct-bearing design is specified — milling is a separate operation from standard fabrication and must be scheduled. Verify with the engineer whether milling is required or whether flame-cut surfaces are acceptable.
Common Mistakes
Not confirming whether erection bolts (temporary bolts to hold the splice while permanent bolts are installed) are in scope. Erection bolt holes in splice plates may need to be shown on the shop drawing.
Recommended Process
Coordinate splice height with the erection contractor before finalizing the shop drawing. The erector needs to confirm that the splice height clears the floor deck and that there is adequate wrench access for the bolting crew.