Prestressed bailey beam for reinforcement and construction method therefor

A construction method adapted for a prestressed Bailey beam for reinforcement, the method comprising the following steps:

• step 1:
• providing Bailey panels, anchor bolts and two stiffening rods, wherein the Bailey panels comprise a front Bailey panel, an end Bailey panel, and a middle Bailey panel set;
• step 2:
• determining positions of the anchor bolts on a surface of a to-be-reinforced region of a concrete structure, drilling holes and inserting the anchor bolts;
• step 3:
• hoisting and mounting the Bailey panels and the stiffening rods to the positions of the anchor bolts, wherein all Bailey panels are linked end-to-end in sequence, the front Bailey panel and the end Bailey panel are installed on both ends of the prestressed Bailey beam respectively, the middle Bailey panel set is installed between the front Bailey panel and the end Bailey panel, the two stiffening rods are disposed on the front Bailey panel and the end Bailey panel respectively, one end of each of the stiffening rods is connected to an upper chord of the front Bailey panel and end Bailey panel respectively through corresponding bolts, each of the anchor bolts passes through a central position of a respective stiffening rod and is fixed on the concrete structure so as to function as a fulcrum for each respective stiffening rod to rotate;
• and screwing nuts into the anchor bolts while ensuring that the stiffening rods are rotatable and the Bailey panels can slide towards both ends during prestress tensioning;
• step 4:
• passing a prestressing tendon through a cylinder of one of the stiffening rods, a lower chord of each of the Bailey panels, and a cylinder on the other one of the stiffening rods, in sequence;
• performing tensioning on the prestressing tendon by using tension equipment;
• and after the tensioning is completed, tightening the nuts to fix the stiffening rods and the Bailey panels;
• and anchoring the prestressing tendon onto the cylinders of the stiffening rods by using a tensioning end anchorage and a fixing end anchorage;
• step 5:
• after the prestress tensioning is completed, fixing a filler between one of the stiffening rods and the lower chord of the front Bailey panel, fixing a filler between the other one of the stiffening rods and the lower chord of the end Bailey panel, and fixing a filler between female ends and male ends of two Bailey panels located at a central position, so as to make the Bailey panels and the stiffening rods a fixed whole;
• and fixing a sealing steel plate on an opening of a prestressing groove so as to form a sealed rectangular steel tube;
• and
• step 6:
• injecting a solidifiable material into the steel tube.