606.01 Description. This work consists of constructing or reconstructing guardrail, guardrail
posts, bridge terminal assemblies, end terminals, and impact attenuators, and noise barriers including the furnishing, assembling, and erecting of all component parts and materials. Guardrail shall be deep beam rail Type MGS, Thrie-Beam, Type 5, or Type 5A. Appurtenances shall include bridge terminal assemblies, end terminals, and impact attenuators. Construction of the various types of guardrail include the furnishing, assembling, and erecting of all component parts and materials, complete in place, at the location shown on the plans or as directed, and according to the manufacturer’s recommendations where applicable.
606.02 Materials. Furnish materials conforming to:
Concrete, Class QC Misc, QC 1, QC 2 ....... ............................................. 499 and 511 Reinforcing steel .............................. 509.02 Deep beam rail and hardware .......... 710.06 Pressure treated guardrail posts and blockouts ................................ 710.14 Steel guardrail posts ......................... 710.15 Wood guardrail posts ....................... 710.12 Galvanizing ...................................... 711.02 Ground Rods………………………..725.16 For guardrail, use deep beam rail Type MGS, Thrie-Beam, Type 5, or Type 5A. Both steel and rectangular wood posts shall be 72” (+3”, -0”) in length. When using round wood posts, construct type MGS using posts 68” (+3”, 0”) in length. MGS Long Posts shall be 96” (±3”) steel or 90” (±3”) rectangular wood. Round wood posts are not to be used for Long Posts.
606.03 Setting Posts. Set or drive posts plumb in a manner that prevents battering or distorting
of posts. Trim posts that are set or driven more than 1 inch above grade. Treat trimmed posts with a preservative material specified in 712.06. Backfill post holes with acceptable material, placed in layers, and thoroughly compacted. Steel and rectangular wood posts shall be embedded to a depth of 40”. Round wood posts shall be embedded to a depth of 36”.
606.04 Erecting Rail Elements. Erect standard design (single-faced) guardrail of the type shown
on the plans. Erect barrier design (double-faced) guardrail as shown on the plans. Erect rail elements in a manner resulting in a smooth, continuous installation. Use shop -curved rail on curves with radii from 5 to 70 feet. Except where otherwise required, such as expansion joint bolts, draw bolts tight. Tighten bolts through expansion joints as tight as possible without preventing the rail elements from sliding past one another longitudinally. Provide bolts long enough to extend at least 1/4 inch beyond the nuts. Do not use splice bolts that extend more than 1/2 inch beyond the nuts. For double -faced guardrail, provide bolts that extend from 1/4 to 1 inch beyond the nuts. Fabricate all metal in the shop. Do not perform burning or welding in the field. The Engineer may approve making holes in the field, but only for special details in exceptional cases. The Engineer may approve field punching, cutting, and drilling if the Contractor demonstrates that its methods do not damage the surrounding metal. Repair galvanized surfaces that have been abraded such that the base metal is exposed, including threaded portions of all fittings and fasteners, and cut ends of bolts as specified by ASTM A 780 except the Department will not allow aerosol spray applications of paints containing zinc dust. Erect guardrail so that the bolts at expansion joints are located at the centers of the slotted holes. Splice the rail elements by lapping in the direction of traffic. Ensure that the plates at each splice make contact throughout the area of the splice.
606.05 Guardrail Splicing. If the plans require proposed guardrail to be connected to existing
guardrail, only cut, drill, or punch the existing w-beam. Connect the proposed guardrail with a w-beam, beam splice per AASHTO M 180. Do not use beam washers.
606.06 Guardrail Rebuilt. As shown on the plans, rebuild existing guardrails. Unless otherwise
shown on the plans, rebuild units of the same type and spacing of members as the existing guardrail. For re-erecting, obtain the rail element from specified salvage sources. Furnish the following new materials: posts, blockouts, bolts, washers, and incidental hardware as necessary to complete the guardrail, except: (1) existing steel posts and blockouts t hat are not damaged and have a good galvanized coating may be reused, and (2) reuse guardrail splice bolts that are undamaged and were not removed during salvage may be reused.
606.07 Anchor Assembly Rebuilt As shown or described in the plans, rebuild existing anchor
assemblies. Refer to the shop drawings, product manuals, and information posted to ODOT’s Approved Products list (found on ODOT Roadway Engineering website) for the repair of proprietary anchor assemblies. Damaged impact heads shall not be reused when rebuilding Type E anchor assemblies.
606.08 Impact Attenuators. Before installing the attenuator, make all corresponding shop
drawings from the manufacturer available for the Engineer’s inspection. Include installation drawings and instructions with the shop drawings that completely describe the attenuator system. Grade the top of each foundation at the same elevation as the adjacent travel lane and/or paved shoulder. Adjust the location of the anchors to avoid pavement joints. The Contractor shall use approved proprietary impact attenuator products as required which can be found on the Office of Roadway Engineering’s website. Cover the face of the impact head with solid fluorescent yellow Reboundable retroflective sheeting conforming to 730.191.
606.09 Noise Barriers. Noise barrier is a proprietary product to be selected based on the ODOT
Environmental Services Noise Program and project requirements. The Noise Wall supplier shall be selected from ODOT’s Approved Noise Wall Suppliers List (See ODOT Materials Management website). Noise barrier shall be installed in accordance with the manufacturer’s recommendations and installation videos.
606.10 Method of Measurement. The Department will measure Guardrail , new or rebuilt, of
the type specified by the number of fee t from center -to-center rail splice points , excluding anchor assemblies. If, however, end connections are made to masonry or steel structures, the Department will measure to the center of the normal post bolt slot. If rail element is used across a bridge, the Department will measure to the first post off the bridge. The Department will measure Anchor Assembly of the type specified by the number each assembly furnished and erected complete. The Department will measure Bridge Terminal Assembly of the type specified by the number of each assembly furnished and erected complete. The Department will measure Impact Attenuator of the type specified by the number of each furnished and erected complete. The Department will measure Guardrail Post of the kind specified by the number of each furnished and erected. The Department will also measure Noise Barrier assemblies by the number of each assembly furnished and erected complete.
606.11 Basis of Payment.
The Department will pay for accepted quantities at the contract prices as follows: Item Unit Description 606 Foot Guardrail, Type ___ 606 Foot Guardrail, Barrier Design, Type ___ 606 Foot Guardrail, Rebuilt, Type ___ 606 Each Anchor Assembly, Type ___ 606 Each Anchor Assembly, Barrier Design, Type ___ 606 Each Anchor Assembly Rebuilt, Type ___ 606 Each Bridge Terminal Assembly, Type ___ 606 Each Impact Attenuator, Type ___ 606 Each Guardrail Post, Type ___ 606 SF Noise Barrier, Type ____ 606 Lump Sum Noise Barrier, Type ____
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