W Section Bridge Guardrails for New Zealand Market

W Section Bridge Guardrails is mainly used in bridge and highway applications and is designed to protect drivers from potential accidents due to traffic collision. It is usually made from mild steel or stainless steel, and it is available in multiple sizes and specifications. Compared to guardrails barrier, W Section Bridge Guardrails provide better protection for drivers as it has a higher crashworthiness rating, compared to other guardrails barrier designs. In terms of production and sale, W Section Bridge Guardrails are produced according to strict safety standards and they are sold in various sizes and specifications depending on the application.

We supply quality w section bridge guardrails fabricated from quality steel materials for highway guard rail system.

Our W beam bridge guardrails are in accordance with BS EN 10002 Methods for Tensile Testing of Metals and TNZ M/23 Specification for Normal W- Section Highway Guardrail.

Tell us your standard requirements or market applied, we will manufacture the right bridge guardrails.

Bridge Guard Rail for Road Safety Barrier

Details and relevant documents for material, testing, all standards for full and half rails for New Zealand standards.

3.4mm Plate Bridge Guardrail Drawing Detail

Supply of steel and fabrication of all components for W section bridge guardrail, posts, post bolts and terminal fittings.

Related Standards
BS EN 10002 Methods for Tensile Testing of Metals
AS 1214:1983 Hot Dip Galvanised Coatings on Threaded Fasteners
AS 1650:1989 Hot Dipped Galvanised Coatings on Ferrous Articles
TNZ M/23 Specification for Normal W- Section Highway Guardrail

RAIL MATERIALS

The rail section is fabricated from oxygen furnace or electric furnace steel having a carbon equivalent content (C + Mn/5) of not greater than 0.5% and a silicon content of not greater than 0.03%. The steel is without cracking, can withstand a cold bend of 1800 around a mandrel of a diameter equal to 2.5 times the plate thickness.
Rail Material Mechanical Properties (determined from tensile tests carried out in accordance with BS 18):

Rails fabricated from sheet or strip steel, conforming with the following dimensions and properties.

Sheet width 483 mm +/- 3 mm
Overall size of rail 310 +/- 3 mm x 83 +/- 3 mm
Plate thickness 3.4 +/- 0.3 mm
Nominal cross-sectional area 1600 mm2
Nominal section modulus, Zyy -2: 8 x 103 mm3
Splice holes 29mm high x 18mm long
Rail - Block Bolt Holes 19mm x 150mm long

The rails are designed for splicing together longitudinally to give a length between centres of splices of 4.000 m with a nominal overlap of 320 mm. Specials may be ordered of lesser length than 4,000 m, in which case the same tolerances shall apply. Each splice shall have eight bolts; splice holes shall be slotted, 29 mm x 18 mm overall, arranged in two parallel rows across the rail, 220 mm between centre lines of rows. The longitudinal axes of the holes shall be transverse to the length of the guardrail.

Splice bolts and nuts, M16

Three rail-block bolt holes shall be formed along the axis of the rail, symmetrically at 2.000 m spacing of centres. These shall be slotted holes, 150 mm x 19 mm.

Delivery of Bridge Guard Rails
Bridge guardrails are ready for assembly when delivered.
Metal edges are rolled or rounded to eliminate sharp corners.
Rails may be required to be curved to fit any radius from 6 m to 45 m; longer radius does not need curving.
Rails (except those specially curved) shall be straight within a tolerance at any point of ± 3 mm measured from a straight line joining the ends.

A backing piece is required for intermediate post connections where there is no splice. This shall consist of a 300 mm length of standard rail having a centrally placed rail block bolt hole of 19 mm diameter. The backing piece may be either to this specification or to TNZ Specification for Highway Guardrail.

SURFACE FINISH

All steel components shall be hot-dip galvanised after fabrication in accordance with AS 1650 or AS 1214 as appropriate.

Fabrication may be subject to inspection at the factory. Steel test certificates for the material to be fabricated available upon request

TESTING

One sample can be taken from the fabricating plant, warehouse or after delivery to the site of construction, for determination of compliance with specification requirements.

All tensile testing is carried out in accordance with BS 18.