W-Beam and Thrie-Beam Guardrail
Thrie-Beam Guardrail
Thrie-beam guardrail features a three-corrugation profile, offering higher impact resistance than standard W-beam barriers. It is designed to absorb and redirect energy from errant vehicles, reducing damage to both the vehicle and its occupants. Hongda produces the barrier to AASHTO M180 from Tang Steel coil and hot-dip galvanizes it to 550 g/m2, meeting the specification required by many road authorities in the Americas. Standard sections measure 4128 x 506 x 83 mm with a 3.0 mm wall thickness, with other thicknesses rolled to order.
Why It Is Specified
Key Benefits
- Three corrugations provide greater impact resistance than standard W-beam barriers
- Rolled to AASHTO M180, the barrier standard specified by road authorities in the Americas
- Hot-dip galvanized at 550 g/m2 (80 microns) for long-term corrosion resistance on exposed roadside installations
- Bolt-through splice pattern allows continuous runs and single-section replacement without site welding
- Q235B or Q345 steel from Tang Steel ensures consistent impact performance across a delivery
- Designed for high-risk areas where vehicle redirection and energy absorption are critical
Where It Goes
Application Scenarios
- High-risk road sections such as sharp curves, steep ramps, and bridge approaches
- Median separations on divided carriageways where higher impact resistance is required
- Approaches to bridges, culverts, and sign gantries with high crash potential
- Roadside installations near steep embankments or drainage ditches where vehicle run-off is a concern
- Areas with heavy truck traffic where the barrier must withstand repeated or high-energy impacts
Buyers
Who It Is For
- Highway contractors sourcing barrier by the container against a road authority specification
- Infrastructure importers and distributors stocking AASHTO M180 barrier for regional resale
- Civil works companies installing guardrail on new roadway alignments with high safety requirements
- Maintenance departments replacing crash-damaged runs in high-impact zones
Procurement Risk
Problems It Solves
- Barrier that fails inspection due to insufficient zinc coating below the 550 g/m2 requirement
- Inconsistent impact behaviour across a delivery caused by mixed steel grades
- Poor splice alignment with existing barrier systems due to mismatched hole patterns
- Corrosion at cut or drilled points leading to premature failure in harsh environments
- Site welding required for installation, increasing time and safety risks on the carriageway
Detail
Technical Features
- Three-corrugation profile, 4128 mm section length by 506 mm depth by 83 mm rib height
- 3.0 mm standard wall thickness, other thicknesses rolled to customer specification
- Q235B (equivalent to S235JR) or Q345 (S355JR / ASTM A529M 1994) hot rolled steel
- Hot-dip galvanized finish, zinc coating 550 g/m2 measured at 80 microns
- Bolt-through splice pattern allowing continuous runs and single-section replacement
- Rolled and punched to AASHTO M180 hole spacing for compatibility with standard posts
Data
Specifications
| Standard Size | 4128 x 506 x 83 x 3.0 mm |
|---|---|
| Thickness | 3.0 mm or customized |
| Steel Grade | Q235B (equivalent to S235JR) / Q345 (S355JR / ASTM A529M 1994) |
| Surface Treatment | Hot dip galvanized |
| Zinc Coating | 550 g/m2 (80 microns) |
| Standard | AASHTO M180 |
| Application | Highway, dangerous area |
Steel
Materials
- Q235B hot rolled carbon steel, equivalent to S235JR, for standard high-impact applications
- Q345 higher strength steel, equivalent to S355JR and ASTM A529M 1994, where the specification requires it
- Coil supplied by Tang Steel so grade and thickness remain consistent batch to batch
- Zinc for the hot-dip bath applied at 550 g/m2, the coating weight specified in most tender documents
How It Is Made
Manufacturing Process
- Steel coil is received and verified for grade before entering the production line
- Coil is roll formed through the thrie-beam forming machine to the three-corrugation profile
- Splice and post holes are punched to the AASHTO M180 pattern
- Sections are hot-dip galvanized in the on-site galvanizing workshop
- Galvanized sections are inspected, bundled, and loaded for container shipment
Inside the Workshop
Checks
Quality Control
- Steel grade verified against Tang Steel supply before forming
- Section length, depth, and rib height checked against the 4128 x 506 x 83 mm profile
- Zinc coating thickness checked against the 550 g/m2 requirement after galvanizing
- Hole pattern and spacing verified to ensure clean splicing without field drilling
- Production covered by the ISO9001 quality system and CNAS factory inspection
Certifications
Shandong Hongda Industry Co., Ltd is an ISO9001 certified company and holds a CE certificate, a CNAS factory inspection certificate and a qualification certificate for batch production. The company is a nominated high-tech enterprise of the Shandong Provincial Government and one of the Top 100 demonstration enterprises named by the Jinan Municipal Government.
Made to Your Drawing
Customization Options
- Wall thickness rolled away from the 3.0 mm standard where the specification requires it
- Q345 substituted for Q235B when the tender calls for the higher strength grade
- Section length and hole pattern matched to the standard being built to
- Supplied as a system with posts, spacers, terminal ends, and bolt sets from the same production run
Compared With Other Products
| W-beam guardrail | W-beam has lower impact resistance but is lighter and less expensive; thrie-beam is used where higher energy absorption is required |
|---|---|
| Open box beam | Box beam offers higher strength and lower maintenance, but is heavier and more costly; thrie-beam provides a balance between performance and cost |
| Concrete barrier | Concrete has no galvanizing and lasts longer, but does not deform on impact and cannot be repaired section by section |
| Cable barrier | Cable systems allow greater deflection and suit wide medians, while thrie-beam is effective in areas with limited space |
Installation
Use Guide
- Set posts to the spacing and embedment depth specified in the road authority document
- Fix the beam to the spacer block first, then secure the assembly to the post
- Lap splices in the direction of traffic flow to prevent snagging on impacting vehicles
- Install upstream and downstream terminal ends at every opening and at the end of each run
- Inspect galvanizing at cut or drilled points and treat any bare steel before handover
- Replace crash-damaged sections individually rather than re-running the entire barrier line
Product Gallery
Thrie-Beam Guardrail Questions Buyers Ask
What standard is your thrie-beam guardrail made to?
AASHTO M180. This is the barrier standard specified by most road authorities across the Americas, which is where the bulk of this product ships.
What steel grade and thickness do you supply?
Standard is Q235B, equivalent to S235JR, at 3.0 mm wall thickness. Q345 (S355JR / ASTM A529M 1994) and other thicknesses are rolled when the specification calls for them.
How thick is the galvanizing?
Zinc coating is 550 g/m2, which measures around 80 microns. Galvanizing is done in our own workshop, so coating weight is controlled in house rather than subcontracted.
What are the section dimensions?
The standard section is 4128 mm long, 506 mm deep and 83 mm at the rib, at 3.0 mm thickness. Length and hole pattern can be matched to the standard you are building to.
Can you supply posts and terminals with the beam?
Yes. Posts, spacers, terminal end sections, bolts, nuts and caps are produced here as well, so a full barrier system ships from one production run.
What is your minimum order and lead time?
Both are confirmed per order against your quantity and specification. Send your drawing or tender extract to [email protected] and we will come back with a quotation.
Do you export in full containers?
Yes. Thrie-beam has shipped in the hundreds of containers annually over the last ten years, mostly to countries in the Americas.
Need Thrie-Beam Guardrail to a Specification
Send the drawing or the tender clause and we will confirm the section, grade, thickness and coating weight we can supply.