Segment girder formwork

Segment girder formwork is a specialized type of formwork used in the construction of segmental girders, typically for bridges, viaducts, and other long-span structures. This method involves creating individual segments of the girder that are assembled on-site. Here's an overview of the process:

Components of Segment Girder Formwork

Formwork Panels:

Made of steel, aluminum, or reinforced plywood, designed to withstand high pressure.

Modular and reusable to accommodate multiple segments.

Supporting Structures:

Includes beams, props, and trusses to hold the formwork in place.

Adjustments are made to align the formwork accurately.

Pre-tensioning or Post-tensioning Systems:

Used to prestress or post-tension the segments for added strength and durability.

Alignment Systems:

Guides or jigs to ensure proper alignment of the segment geometry.

Joint Formers:

Designed to create shear keys or other joint details for proper interlocking between segments.

Process of Using Segment Girder Formwork

Preparation:

The formwork is cleaned and assembled in a controlled environment (casting yard or on-site).

Reinforcement cages are placed inside the formwork.

Concrete Pouring:

Concrete is poured into the formwork.

High precision is needed to maintain the required dimensions and tolerances.

Curing:

Segments are cured for the required time to achieve strength.

Demolding:

The formwork is carefully removed without damaging the segment.

Transportation and Assembly:

The completed segments are transported to the construction site.

Segments are assembled using cranes and connected through post-tensioning or adhesives.

Advantages

Precision: High-quality formwork ensures dimensional accuracy for tight tolerances.

Flexibility: Modular design accommodates varying segment shapes and sizes.

Reusability: Formwork materials are durable and can be reused multiple times.

Speed: Prefabrication reduces on-site construction time.

Applications

Segmental bridge construction (e.g., box girders, I-girders).

Long-span structures requiring modular assembly.

Precast or cast-in-situ construction methods.