A precast girder is lifted and installed to a proper position by a bridge girder launcher. Here we refer a post-tensioning method to produce concrete girders with good quality, which needs to tighten and adjust the formwork well.
As finishing assembling the formwork, check the formwork as well as install embedded devices in the process of model and reinforcement cage installation, it mainly includes: support plate, embedded plate for beam falling prevention support frame, fixed embedded nut for water drainage pipe, embedded plate for overhead line system pillar (anchorage pillar, anchorage bracing wire) and all pore-forming devices (ventilation hole of web plate, bottom plate, water drainage hole of top plate, hoisting hole of top plate, preformed hole for cable channel at end of girder and others). After finishing all formwork, final adjustment must be done to meet the standard, fill examination data in accordance with girder check list items after all dimensions meet the requirement. As concreting, special person has to be appointed to check the formwork, fastening bolt and fasteners, a comprehensive check must be done if they become flexible.