Spatial multi-point synchronous closure construction method for a three-main-truss steel truss arch bridge

A spatial multi-point synchronous closure construction method for a three-main-truss steel truss arch bridge, comprising the following steps:

• S1, setting up standard rods on side piers on both sides to form a closure opening between the standard rods on both sides, and adjusting free ends of the two standard rods at the closure opening to designed spatial coordinate locations;
• S2, relatively re-measuring spatial coordinates of the two standard rods at the closure opening and a closure opening spacing to obtain the closure opening spacing, and accurately positioning the two standard rods at the closure opening;
• S3, processing closure rods, and mounting a fine adjustment device on the free ends of the two standard rods at the closure opening;
• S4, mounting the closure rods on one of the standard rods at the closure opening, and adjusting the spatial positions of the closure rods;
• S5, monitoring an atmospheric temperature and obtaining a changing rule of the closure opening;
• S6, pushing the other one of the standard rods at the closure opening along a closure direction to form a closure gap;
• S7, finely adjusting the closure gap along the closure direction of the bridge with the fine adjustment device;
• and
• S8, fixing and closuring the closure rods with the two standard rods at the closure opening.