Box Girder Formwork

Box girders demand the tightest geometry control in precast bridge work: web plumbness, slab thickness and segment joint faces all translate directly into erection speed on site.

Zhongbian builds box girder moulds as modular systems — external stiffening frame, adjustable internal formwork and matched bolt holes — so sections close square every cycle.

Inner forms strip mechanically or hydraulically depending on the yard cycle plan, and every set is trial-assembled with a dimensional report before dispatch.

Box girder moulds are used in precast yards producing bridge girders for highway viaducts, railway bridges and urban expressway works, where girder geometry must repeat within tight tolerance.

Highway and rail bridges. Precast box girders for expressway and railway viaducts are produced in a casting yard and then launched or lifted into place, so each unit must match the design section exactly.

Segmental yard production. In match cast work every segment is cast against the previous one. Mould geometry, joint plates and soffit alignment have to be right before the first unit is poured.