The utility model relates to a concrete construction and watering field, especially a secondary structure for can repeatedly make, including right angle U type splint, its characterized in that: a side thickness of mold plate's side template slot respectively cuts in template department in insertion both sides on its U die bed portion right -angle side, and splint U type structure both sides havean outer panel respectively, and splint form according to the nimble cutting of the size of roof beam. The both sides template through the card in splint sides template slot, produce when the roof beam concrete is built in furthest's restraint to the extrapolability, keep the vertical level and smooth of side form board to guarantee the vertical level and smooth of placing concrete roof beam. Theutility model discloses a become the board cutting and form, not only solved the job site template extravagant big, be difficult to guarantee the geometry scheduling problem, simultaneously can reuse,effectively improved the template utilization ratio, just the utility model discloses simple structure, low cost, the turnover number of times is many, and it saves labour to save time.