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Highway Guard Rails

Steeledge Steel Scaffolding LLC is engaged in manufacturing and supplying high quality steel Highway Guard Rails, with proven efficacy. While we have wide experience in manufacturing and supplying these products within Dubai (UAE), we are also exporting them in different parts of the globe as well. And, needless to say, we have been successful in carving our niche in the highly competitive market of Manufacturers, Suppliers and Exporters of steel products.


The Highway Guard Rails supplied by us can be easily installed and eliminates the need for skilled labor. Long life, strength, durability and superior performance are the unmistakable attributes of our products. And, you can get all this within competitive price brackets.

SPECIFICATIONS FOR MATERIALS

SCOPE

This specification covers Corrugated sheet steel prepared for use as beams in highway guardrails. Two classes and four types of guardrail are provided as follows :
Classes

  • Class A-Base metal nominal thickness-0.105 in. (2.67 mm).
  • Class B-Base metal nominal thickness-0.135 in. (3.43 mm).
Types
  • Type 1 -Zinc coated, 1.80 ounces per square foot (550 g/m') minimum single-spot.
  • Type 2 -Zinc coated, 3.60 ounces per square foot (1100 g/ml) minimum single-spot.
  • Type 3-Beams to be painted.
  • Type 4-Beams of corrosion resistant steel.

BASIS OF PURCHASE

Orders for guardrail under this specification shall include the following information, as required, to describe adequately the desired material :

  • Quantity (linear feet or number of pieces),
  • Class of Guardrail,
  • Type of Guardrail,
  • Effective length of beam section (12'-6" or 25'-0") (3.8 or 7.6 m),
  • Shape (W-Beam or Thrie Beam), and
  • Exceptions to this specification, or special requirements, if any

BASE METAL MANUFACTURE

The beam, transition, end and buffer sections shall consist of sheet made of open hearth, electric furnace or basic oxygen steel.

Mechanical Properties :
The mechanical properties of the base metal shall conform to the following requirements:

Beams and transition sections :

  • Yield Point, minimum, 50,000 psi (345 MPa)
  • Tensile Strength, minimum, 70,000 psi (483 MPa)
  • Elongation, in 2 inch (50 mm), minimum, 12 percent

End and buffer sections :

  • Yield Point, minimum, 33,000 psi (227 MPa)
  • Tensile Strength, minimum, 45,006 psi (310 MPa)

Test specimens for mechanical properties shall be prepared and tested as specified in ASTM A 525 except that correction for thickness of zinc coated specimens shall be 0.003 in. (0.08 mm) for Type 1 beam and 0.006 in. (0.15 mm) for Type 2 beam.

Chemical Composition

The chemical composition of the base metal for Type 4 beams shall be as approved by the Engineer.

SHEET OR BEAM THICKNESS

The nominal thickness for the finished beam or sheet shall conform to the requirments as prescribed in Table 1

For fabricated beams, thickness measurements will be made on tangent portions of the cross-section.

SHEET WIDTH

The beam elements shall be formed from sheets having nominal widths of 19 inches (483 mm) for W-Beams and 29'12 inches (749 mm) of Thrie Beams. Tolerance from the nominal width of minus '18 inch (3.2 mm) will be permissible.

NOTE: The requirements of paragraph 5.1 are intended to define the minimum width sheet permissible. Calculation of exact width dimensions from Figures 1 and 2 shows that the finished product may slightly exceed these widths. However, the dimensions of Figures 1 and 2 can be met within allowable tolerance by using the nominal widths. Use of sheets slightly greater than the nominal widths is permissible provided the tolerances in Figures 1 and 2 are met.

 

GALVANIZED BEAMS

  • The beams may be galvanized before or after fabrication. The zinc used for the coating shall be as prescribed in AASHTO M 120, and shall be at least equal to the grade designated as "Prime Western."
  • The weight of coating shall conform to the requirements prescribed in Table 2 for the types specified. The weight of coating is the total amount of galvanizing on both sides of a sheet or beam, expressed as ounces per square foot (g/m2) of sheet.
  • The sheets or beams shall be of prime finish, that is, free from injurious defects such as blisters, flux, and uncoated spots. Uncoated edges resulting from shearing or punching will not be considered objectionable.
  • The coating shall be smooth, free of beading or sharp projections along the edges and shall adhere tenaciously to the surface of the metal. The adherence of the zinc coating to the surface of the base metal shall be determined by cutting or prying with a stout knife, applied with considerable pressure in a manner tending to remove a portion of the coating by paring or whittling, and it shall not be possible to peel any portion of the coating so as to expose the base metal.
  • The test specimen size and method of tests for determining the weight of coating shall be as prescribed in AASHTO T 65. At the option of the Engineer, material may be accepted on the basis of magnetic gage determinations made in accordance with ASTM E 376.
Beam or Sheet Thickness
 
Class A
Class B
Type Thickness Tolerance under specified thickness. No limit for over thickness Thickness Toleranace under specified thickness. No limit for over thickness
  in mm in mm in mm in mm
1 0.108 2.74 0.009 0.23 0.138 3.51 0.010 0.25
2 0.111 2.82 0.009 0.23 0.141 3.58 0.010 0.25
3 0.105 2.67 0.009 0.23 0.135 3.43 0.010 0.25
4 0.105 2.67 0.009 0.23 0.135 3.43 0.010 0.25

Weight of Coating
Type Min Check Limit Single-SpotTest oz/ft3 g/m3 Min Cheek Limit Triple-SpotTcst oz/ft3 g/m3
1 1.80 550 2.00 610
1 3.60 1100 4.00 1220

PAINTED BEAMS

Beams which are to be painted shall be cleaned and shop painted with one coat of rust-inhibitive primer. The primer shall have a tough and durable surface and shall be thoroughly dry before the sheets are handled or packed for shipment.

CORROSION RESISTANT BEAMS

Beams of corrosion resistant steel shall not be painted or galvanized. They shall be so handled and stored that the traffic face of these beams, used in a continuous run of guardrail, shall not show a distinctive color differential.

END OR BUFFER SEMONS

End or buffer sections shall be of the same or greater thickness of metal and the same Type as the beam to which it is attached or the engineer may specify the minimum thickness of metal and Type.

FABRICATION

The beams and end or buffer sections shall be shaped and punched in conformance with the requirements shown in Figures 1 and 2. Transition sections shall be fabricated in accordance with Figure 4 and shall provide a smooth and uniform transition between beams. They shall be ready for assembly when delivered. Only drilling or cutting necessary for special connections and for sarnpling will be permitted in the field. Warped or deformed beams will be rejected. Beams to be erected on a radius of 150 feet (45 m) or less shall be shop curved to the appropriate curvature of the installation.

CONNECTIONS AND SPLICES

All connections or splices shall be formed with oval shoulder button headed bolts to minimize projections on the road side of the guardrail. Unless otherwise specified, bolts and nuts for Types 1, 2 and 3 beams shall conform to or exceed the requirements of ASTM A 307 and shall be hot-dip zinc coated in accordance with the requirements of AASHTO M 232, Class C. When specified by the Engineer to be mechanically galvanized, bolts and nuts shall be mechanically zinc coated and the coating shall conform to the coating thickness, adherence and quality requirements of AASHTO M 232, Class C. Bolts and nuts for Type 4 beams shall be of an approved corrosion resistant material and conform to or exceed the requirements of ASTM A 307. Splice and post bolts and nuts shall conform to one of the configurations shown in Figure 3. Either of the alternate configurations may be furnished unless otherwise specified by the Engineer.

WASHERS AND BACK-UP PLATES

Washers shall be rectangular as shown in Figure 1. Washers for Types 1, 2 and 3 beams shall be galvanized in accordance with the requirements of AASHTO M 232. Washers for Type 4 beams shall be of an approved corrosion resistant steel. Back-up plates if specified for use at nonsplice points shall consist of one-foot (305 mm) sections of beams and shall be ofthe same Class and Type specified for the full length beams.

GALVANIZING REPAIR

Where the galvanizing on guardrail or fittings has been damaged, the coating shall be repaired by regalvanizing or the surface repaired by painting with two coats of zinc dust-zinc oxide paint confirming to Federal Specification TT-P-641 or MIL-P-21035.

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