WHAT IS BOX GIRDER AND HOW DID IT EVOLVE?



MOD SCAFF PVT. LTD. manufactures all types of Formwork Systems like Girder Shuttering based at Faridabad, Delhi/NCR. We manufacture Girder Shuttering as per customers drawing using high quality basic material, to ensure durability and resistant of rust in adverse conditions. This Girder Shuttering tested on defined parameters to ensure that the offered range of Girder Shuttering is as per the international quality standards.

A box or tubular girder is a girder that forms an enclosed tube with multiple walls, as opposed to an I or H-beam..... Generally the term box girder is used, especially if it is rectangular or trapezoidal in cross - section.

ITS EVOLUTION

With time, as the span and the width increased, the beams and bottom slabs had to be tied to keep the geometry which in turn lead to evolution of box girder.

TYPES OF BOX GIRDER CONSTRUCTION

The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Box girders are more suitable for larger spans and wider decks.


1) Box girder bridges may be cast in place (Cast in situ) using false-work supports, which is removed after concrete has gained its strength. (Fig 1)
2) It is also cast in sections in case of a segmental bridge. Here, the segments of 2.5 – 3.0 meters are precast in a casting yard and then transported to site in a trailer and installed using cranes.(Fig. 2)
3) Another method of box girder bridge construction is the incremental launching. Under this method, gantry cranes are often used to place new segments onto the completed portions of the bridge until the bridge superstructure is completed. (Fig. 3)

Fig.1 Cast in Situ Box Girder Construction
Fig.2 Segmental Box Girder Construction
Fig.3 Incremental Box Girder Construction

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