- 915 - SECTION 1066 -- W-BEAM AND THRIE-BEAM GUARDRAIL
1066.01 Description
1.Galvanized W-beam and Thrie-beam guardrail shall be as shown in the contract.
1066.02 Material Characteristics
1.All parts shall be interchangeable with similar parts from other manufacturers.
2.Materials for W-beam and Thrie-beam guardrail shall conform to the requirements in AASHTO M 180, Type I Class A.
3.Wood posts and blocks shall c onform to the requirements in Section 1075.
4.Plates and other steel items s hall conform to the requirements in ASTM A 36/A 36M.
5.The galvanized bolts shall conform to the requirements in ASTM F 568 Class 4.6.
6.Steel posts shall conform to the requirements in Section 1067.
7.End shoes shall meet the r equirements of AASHTO M 180 Class B and be at least 10 gauge [0.138 inch (3.5 mm)] thick steel.
8.All anchor rods and plates, unless otherwise specified, shall conform to the physical requirements of ASTM A 36/A 36M.
9.Turnbuckles and clevises shall be steel forgings conforming to the requirements of ASTM A 668, Class B. The forgings shall be annealed before being machined.
1066.03 Acceptance Requirements
1.W-beam and Thrie-beam guardrail will be accepted based on requirements of this Section and sampling and testing requirements in accordance with the Department’s Materials Sampling Guide . - 916 - SECTION 1067 -- STEEL GUARDRAIL POSTS AND SPECIAL POSTS
1067.01 Description
1.This Specification covers stee l "W 6X9" (W 150x14)” beam sections used as an alternate for treated timber guardrail line posts.
1067.02 Material Characteristics
1."W 6X9" (W150 x 14)” beam sections for use as beam guardrail line posts shall be fabricated from steel complying with the requirements of ASTM A 36/A 36M, A 588/A 588M, or A 242/A 242M and conforming to the size, weight, and dimensions shown on the designated plans. All welding shall be in accordance with AWS Specifications.
2.Bolts shall be as shown in t he contract. Galvanized bolts are required, and they shall conform to ASTM F 568 Class 4.6 or A 307. ASTM A 325, Type 3 bolts may be used with ASTM A 588/A 588M or ASTM A 242/A 242M steel without galvanizing.
3.Posts, blocks, and all necessary hardware fabricated from ASTM A 36/A 36M steel shall be galvanized in accordance with ASTM A 123.
4."W 6X9" (W150 x 14)” beam se ctions are not authorized for the following uses:
a.Curved beam guardrail (CRT posts and adjacent 4 posts).
b.End anchorage assembly - alternate design (at the last post). c. Terminal sections (BCT, MELT, SRT, BEST, ET 2000, SKT 350).
d.The 7 posts located at the tip of a bullnose.
1067.03 Acceptance Requirements
1.Steel guardrail posts and spec ial posts will be accepted based on requirements of this Section and sampling and testing requirements in accordance with the Department’s Materials Sampling Guide .
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 949–949 of 1,048.