W-Beam Guardrail

Curved Guardrail Beams – Custom Radius and Special Lengths

Curved Guardrail Beams – Custom Radius and Special Lengths

Product Category: W-Beam Guardrail
Brand / Origin: SinoGuardrail / Shandong, China
Description: Shop-curved W-beam and thrie-beam guardrail for tight curves, intersections and bridge ends. Custom radius, length and holes made to your drawings.
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What Is a Curved Guardrail Beam?

A curved guardrail beam is a W-beam or Thrie-beam rail that is bent in the factory to a set radius. It is used where a straight rail cannot follow the road, such as tight curves, intersections, driveways, roundabouts and the wrap-around at bridge ends.

SinoGuardrail shop-curves rails to the radius, curve direction and hole pattern on your drawing, then hot-dip galvanizes the finished beam.

Curved Guardrail Key Facts

Many road authorities require shop-curved rail when the radius is about 45 m (150 ft) or less. Above that, straight rails can usually follow the curve during installation.
Rails are curved before galvanizing, so the zinc coating is not cracked by bending.
Both W-beam and Thrie-beam rails can be curved.
The order must state the radius, curve direction (concave or convex to traffic), arc length and hole positions.
Curved rails use the same posts, spacers and bolts as straight rails.

Where Curved Guardrail Is Used

Tight road curves and hairpin bends on mountain roads
Intersections and driveways where the barrier turns around a corner
Roundabouts and small-radius ramps
Bridge ends, where the rail wraps around the end of a parapet
Radius end sections that turn the rail away from traffic

Concave and Convex Curves

The curve direction is described from the traffic side of the rail. Getting it wrong means the rail cannot be installed, so it must be clear on the drawing.

Curve type	Rail face toward traffic	Typical location
Concave (inside curve)	Curves toward the traffic	Inside of a bend, around a corner the vehicle drives inside of
Convex (outside curve)	Curves away from the traffic	Outside of a bend, wrap-around at bridge ends and corners

Technical Specifications

Item	Typical value / what to confirm
Profile	W-beam (about 310 mm wide) or Thrie-beam (about 506 mm wide)
Radius	To your drawing; tell us the smallest radius on the project and we will confirm it before production
Curve direction	Concave or convex, seen from the traffic side
Length	Standard rail length or a custom arc length to the drawing
Thickness	2.67 mm / 3.43 mm (AASHTO Class A / B), or 2.75 / 3.0 / 4.0 mm
Steel	Q235B, Q345B or equivalent; mill test certificate supplied
Holes	Splice slots and post holes punched to match the curved position
Zinc coating	Hot-dip galvanized after curving: 550 g/m² or 1100 g/m² total, or as specified

What to Send for a Curved Guardrail Quote

Radius of each curved section (or the road layout drawing)
Curve direction: concave or convex to traffic
Arc length or number of rails per curve
Rail profile (W-beam or Thrie-beam), thickness and coating
Post spacing on the curve and hole positions
Quantity, destination port and delivery date

Tip: mark each curved rail with its location on the drawing. We will label the bundles the same way, so the installation crew can find the right rail on site.

Curved rails are usually ordered together with straight rails and end parts. See W-beam guardrail, Thrie-beam guardrail, the W-beam to Thrie-beam transition for connections to bridges, and our guardrail end treatment.

Why Choose SinoGuardrail for Curved Guardrail Beams

25+ years of guardrail production and export, 3000+ tons of annual output, 1000+ projects supplied in 50+ countries.
Drawing-based production: length, thickness, hole pattern and coating are made to your approved drawing.
Quality control: raw steel checks, dimension and hole checks, and zinc coating measurement for every production lot.
Documents: mill test certificates, coating inspection records and packing lists can be supplied for project review.
One shipment: rails, posts, spacers, bolts and end treatments packed and marked together.

Frequently Asked Questions

When do I need a curved guardrail beam instead of a straight one?

When the curve is too tight for straight rails to follow. Many authorities set the limit at about 45 m (150 ft) radius. Always follow your project specification.

Can you curve Thrie-beam guardrail?

Yes. We curve both W-beam and Thrie-beam rails to the radius on your drawing.

Is the rail galvanized before or after curving?

After. Curving first and galvanizing second keeps the zinc coating complete and free of bending cracks.

What is the smallest radius you can make?

It depends on the profile and thickness. Send the drawing and we will confirm the radius before quoting.

Barrier beams	Posts and spacers	End treatments and hardware
W-beam guardrail	Guardrail H post	W-beam fishtail end
Thrie-beam guardrail	Guardrail Sigma post	Guardrail end treatment
Bridge guardrail	Guardrail U post	Bolts, spacers and washers
Transition beam sections	Guardrail C post	Safety roller barrier

Request a Curved Guardrail Beam Quote

Send the radius, curve direction, rail profile, quantity and destination port. We will check the drawing and quote the curved rails with all matching parts.

Send Drawings and BOQ WhatsApp

Export Markets for Road Safety Barrier Projects

SinoGuardrail supplies highway guardrails and roller barrier systems for contractors, distributors and infrastructure project buyers in Southeast Asia, the Middle East, Africa and South America.