The utility model provides an use construction structures of two -period form screw rod, belongs to building construction field. Its characteristics are: it includes first screw rod, can dismantle the second screw rod of being connected that is used for drawknot PCF board and cast -in -place layer with first screw rod, and wherein first screw rod be the double threaded screw, and the second screw rod is the full thread screw rod, connect through hex nut between first screw rod and the second screw rod, hex nut embedded in with the isolated round platform of the cast -in -place layer rubber sleeve pipe that appears. Position that the second screw rod lies in the template outside then with the tradition use unanimous to drawing the screw rod, fix the template through the lumps of wood, steel pipe, chevron card and the nut in the template outside. Its positive effect is: owing to adopted the two -period form integrated configuration, after removal of form, to reserve one section screw rod and connect PCF board and cast -in -place layer, another section screw rod is pulled down and repeatedly usable from cast -in -place layer, can fix the cast -in -place layer template, can strengthen PCF board and cast -in -place layer's joint strength again, has simplified the installation of screw rod simultaneously and has lifted off, has simplified the site operation.