for Highway Construction Page 492 of 71 5 SECTION 6 12 – GUARDRAIL
612.01 Description.
Provide and install guardrail and concrete barrier .
612.02 Materials.
Provide materials as specified in: Excavation and Embankment ....................................................................................................... 205 Concrete ....................................................................................................................................... 502 Metal Reinforcement .................................................................................................................... 503 Steel Guardrail Posts ............................................................................................................... 708.07 Guardrail and Hardware .......................................................................................................... 708.14 Wood Guardrail Posts and Wood Blockouts ............................................................................ 710.03
612.03 Construction Requirements.
A.Guardrail . Install galvanized steel w -beam or thrie- beam guardrail as specified . Set posts plumb. Backfill around posts with native soil or pea gravel. Place backfill material in layers and thoroughly tamp. The Contractor may drive the posts if it can be done without damage to posts, pavemen t, shoulders, or adjacent slopes. Drill timber posts before treating. Field drilling is allowed provided the hole is treated with a wood preservative as specified in 710.09 before installing the bolts . Remove, replace, or reinstall misaligned, loose, or damaged posts and repair damage to the existing pavement , shoulders, or adjacent slopes at no additional cost to the Department. Install guardrail terminals in accordance with the manufacturer’s written installation instructions. Provide and install self -adhesive object marker sheeting t o the end of guardrail terminals or provide an object marker for each guardrail terminal.
B.Concrete Barrier. Concrete according to 502. Finish the concrete on precast and cast -in-place concrete barrier with an ordinary surface finish as specified in 502.03. Set concrete barrier to the line and grade as specified.
612.04 Metho d of Measurement.
The Engineer will measure acceptably completed work as follows:
1.W- beam guardrail , precast concrete barrier , and cast -in-place concrete barrier will be by the foot, including the length of anchors, terminals, and transitions.
2.Guardrail anchors, guardrail terminals, guardrail transitions, concrete barrier terminals, and concrete barrier transitions will be per each. for Highway Construction Page 493 of 71 5 612.05 Basis of Payment . The Department will pay for acceptable quantities at the contract unit prices as follows: Pay Item Pay Unit W-beam Guardrail .................................................................................. FT Guardrail Anchor .................................................................................... Each Guardrail Terminal .................................................................................. Each Guardrail Transition ................................................................................ Each Precast Concrete Barrier ........................................................................ FT Concrete Barrier Terminal ...................................................................... Each Concrete Barrier Transition ..................................................................... Each Cast-in-place Concrete Barrier ............................................................... FT The additional payme nt for anchors, terminals, and transitions cover the additional materials and work necessary for these items. The chamfered b arrier for guardrail transition is incidental to the guardrail transition pay items . Guardrail terminal grading is measured and paid in as specified in 205. Miscellane ous guardrail or barrier components are incidental and the cost included in the guardrail or barrier contract unit prices. Precast concrete barrier will be accepted on certification with an ITD- 961. for Highway Construction Page 494 of 715 SECTION 613 – CRASH CUSHIONS
613.01 Descri ption.
Provide and install crash cushion.
613.02 Materials.
Provide crash cushion with pad or foundation as shown on the crash cushion and roadside terminal categorization charts. Provide materials as specified: Nonstructural Concrete ................................................................................................................. 509 Reinforcing Steel ..................................................................................................................... 708.02
613.03 Construction Requirements.
Asse mble and install crash cushion and pad or foundation as specified and in accordance with the manufacturer’s written installati on instructions. Submit an installation and repair manual specific to the installed crash cushion. Provide and install self -adhesive object marker sheeting to the nose of the crash cushion or provide an object marker for each crash cushion.
613.04 Method of Measurement.
The Engineer will measure acceptably completed work per each installation.
613.05 Basis of Payment .
The Department will pay for acceptable quantities at contract unit prices as follows: Pay Item Pay Unit Crash Cushion, Sacrificial - Sand .......................................................... Each Crash Cushion, Sacrificial - Water Filled ............................................... Each Crash Cushion, Sacrificial - Metal .......................................................... Each Crash Cushion, Partially Reusable ........................................................ Each Crash Cushion, Low Maintenance ......................................................... Each Crash cushion pad, transitions, and object marker are incidental and the cost included in the crash cushion contract unit prices.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 528–529 of 768.