8-39 Section 862
862-1 Description
Construct either permanent or temporary steel beam guardrail, in accordance with the contract and at the locations designate d in the plan s or as directed by the Engineer .
862-2 Materials
Refer to Division 10. Item Section Anchors 1046 -5 Guardrail and Barrier Delineators 1088 -2 Guardrail End Delineation 1088 -3 Guardrail Steel Post 1046 -3 Hardware 1046 -4 Organic Zinc Repair Paint 1076-7 Posts and Offset Blocks 1046 -3 Rail Elements 1046 -2 Select Material, Class VI 1016 Welded Wire Reinforcement 1070 -3 Supply material in accordance with the Department’s Brand Certification p rogram for guardrail , listed on Department’s pre -approved producer/suppliers list and NCDOT APL . The preapproved list is available on the Department’s website. Units shall not be modified by the manufacturer and installer once approved and on the NCDOT APL. Prior to installation the Contractor shall submit to the Engineer certified working drawings and assembling instructions from the manufacturer for each guar drail end unit in accordance with
Article 105 — 2.
Perform installation in accordance with the details in the plans, and details and assembling instructions furnished by the manufacturer. Temporary guardrail shall be of the type called for in the plan s and s hall be fabricated from plates that are at least 12 gauge in thickness. Used materials are acceptable for temporary guardrail construction provided their condition is approved by the Engineer .
862-3 Construction Methods
Erect the rail elements to produce a smooth continuous rail paralleling the line and grade of the highway surface or as shown in the plans. Lap the rail elements in the direction of traffic. Re - lap the rail elements if required by traffic phasing. Field drill holes for special details. Field punching holes is allowed. Attach terminal sections, when required, to the ends of each installation and lap on the face of the rail. Install shop curve guardrail in accordance with the plans. Posts may be power driven, or set by hand. Protect the top of steel posts by a suitable driving cap if power driven. If set by hand, dig post holes to the depth and at the locations shown in the plan s. Thoroughly ram the bottom of the post holes so that the posts will have a stable foundation. Set the posts plumb and accurately space and line. Backfill the post holes in 6 inch layers with suitable material and thoroughly compact. Where rock interferes with the pr oper installation of the post, excavate a shaft in the rock at least 9 inches wide, parallel to the roadway, by 23 inches long, perpendicular to the roadway and 24 inches deep. Place the post against the roadside edge of the shaft and fill in behind the post with Class VI select material , up to the top elevation of the rock. Fill the remainder of the hole with earth material. Where timber posts are to be driven in fill slopes 1 .5:1 or steeper and
8-40 the fill height is 15 f eet or more, auger a 6 inches diameter pilot hole to the full depth of the
post before driving. Where steel posts are required to be installed at box culverts, weld the post to the anchor plate, cut off and align in accordance with the details shown in the plans or as directed by the E ngineer . Use the same type of guardrail posts and offset blocks throughout the project unless otherwise directed by the Engineer or detailed in the plans. Extra length guardrail posts shall be installed in accordance with the c ontract . The 25 f oot Clear Sp an Guardrail Sections shall be constructed in accordance with the Roadway Standard Drawings . After galvanized guardrail has been erected, repair damaged coating in accordance with
Article 1076 — 7.
When guardrail is being constructed near traffic, conduct o perations to constitute the least hazard to the public. Schedule and conduct operations to construct and complete each individual continuous guardrail installation in the least possible time. Do not begin work on any section of new guardrail until prepara tions are made to fully complete the installation of the section as a continuous operation. Once work begins on a section, pursue the work to its completion unless inclement weather or other conditions beyond the control of the Contractor interfere with t he work. Begin attachment of the rail elements at the approach end of the guardrail and continue in the same direction as the movement of traffic. When directed by the Engineer , install guardrail posts and blocks at locations that are in addition to those required by the plans. Install tubular triple corrugated steel beam guardrail on concrete bridges or driven posts or at locations shown in the plans in accordance with the details shown in the plans and as directed by the Engineer . Where the tubular trip le corrugated steel beam guardrail is to be mounted on concrete, use steel posts, weld the post to the anchor plate, cut off and align in accordance with the details shown in the plans or as directed by the Engineer .
862-4 Guardrail Delineators
Use any of the several alternate delineator types for guardrail shown in the plans, but only one delineator type for guardrail at any one time throughout the project. The delineators consist of a reflector and base or casing. Attach the delineator to the guardrail as shown in the plans. Only one attachment position will be permitted throughout the project length. Position delineators perpendicular to the cent erline of the road. Use yellow delineators in the median and on the left side of one -way ramps, loops or other one -way facilities. Use white delineators on the right side of divided highways, ramps, loops and all other one -way or two-way facilities. In all cases, the color of the delineator shall supplement the color of the adjacent edgelines.
862-5 Temporary Guardrail
Temporary guardrail may be reused if it is in satisfacto ry condition. After temporary guardrail is no longer needed, it becomes the property of the Contractor. Remove the temporary guardrail from the project.
862-6 Measurement and Payment
Steel Beam Guardrail will be measured and paid in linear feet of guardrail that has been satisfactorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made from center to center of either the
8-41 outermost post or the w -beam midspan panel splice point of the guardrail in the length of
guardrail being measured. Steel Beam Guardrail, Shop Curved will be measured and paid in linear feet of guardrail that has been satisf actorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made from center to center of either the outermost post or the w -beam midspan panel splice point of the guardrail in the length of guardrail being measured. Steel Beam Guardrail, Double Faced will be measured and paid in linear feet of guardrail that has been satisfactorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made from center to center of either the outermost post or the w -beam midspan panel splice point of the guardrail in the length of guardrail being measured. Triple Corrugated Steel Beam Guardrail will be measured and paid in linear feet of guardrail that has been satisfactorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made from center to center of either the outermost post or the w -beam midspan panel splice point of the guardrail in the length of guardrail being measured. 20 Inch Tubular Triple Corrugated Steel Beam Guardrail will be measured and paid in linear feet of guardrail that has been satisfactorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made from center to center of either the outermost post or the w -beam midspan panel splice point of the guardrail in the length of guardrail being measured. Temporary Steel Beam, Guardrail will be measured and paid in linear feet of guardrail that has been satisfactorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made from center to center of either the outermost post or the w -beam midspan panel splice point of the guardrail in the length of guardrail being measured. Temporary Ste el Beam Guardrail, Shop Curved will be measured and paid in linear feet of guardrail that has been satisfactorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made fro m center to center of either the outermost post or the w -beam midspan panel splice point of the guardrail in the length of guardrail being measured. Temporary Steel Beam Guardrail, Double Faced will be measured and paid in linear feet of guardrail that has been satisfactorily completed and accepted exclusive of that length of guardrail that is within the pay limits of guardrail anchors. Measurement will be made from center to center of either the outermost post or the w -beam midspan panel splice point of t he guardrail in the length of guardrail being measured. Steel Beam Guardrail Terminal Section and Temporary Steel Beam Guardrail Terminal Sections will be measured and paid in units of each completed and accepted, exclusive of terminal sections that are within the pay limits of guardrail anchors. Triple Corrugated Steel Beam Guardrail Terminal Sections will be measured and paid in units of each completed and accepted, exclusive of terminal sections that are within the pay limits of guardrail anchors. Guar drail End Units, Type __ __ and Temporary Guardrail End Units Type ____ will be measured and paid as units of each completed and accepted. No separate measurement will be made of any rail, terminal sections, posts, offset blocks, concrete, hardware or any other components of the completed unit that are within the pay limits shown in the plan s for the unit as all such components will be considered to be part of the unit. Guardrail Anchor Units, Type ___ and Temporary Guardrail Anchor Units Type ___ will be measured and paid as units of each completed and accepted. No separate measurement will be
8-42 made of any rail, terminal sections, posts, offset blocks, concrete, hardware or any other
components of the completed unit that are within the pay limits shown in the plans for the unit as all such components will be considered to be part of the unit. W-TR Steel Beam Guardrail Transition Sections will be measured and paid in units of each completed and accepted. The quantity of 25ʹ Clear Span Guardrail Sections will be measured and paid in units of each which have been completed and accepted. Extra Length Guardrail Post (__ʹ Steel) will be measured and paid for in units of each that have been installed and accepted . Additional Guardrail Posts will be measured and paid in units of each for additional posts required but not shown in the plans. Temporary Additional Guardrail Posts will be measured and paid for in units of each for additional posts required but not shown on the plans that have been installed and removed after the temporary additional guardrail posts are no longer needed on the project. There will be no measurement or payment made for g uardrail delineators or guardrail end delineation as they are inci dental to the other pay items in th is section . Such price and payment includes, but is not limited to, furnishing and erecting posts, offset blocks, rail, terminal sections, miscellaneous hardware and all other materials ; field curving and shop curving of the rail; removing temporary guardrail; excavation; furnishing and installing additional guardrail posts and additional offset blocks; backfilling; fabrication; welding; galvanizing; and furnishing and installing guardrai l delineators and end delineation. Where an anchor plate is required, the cost for anchorage of guardrail posts on box culverts will be made in accordance with Article 104 -7, unless otherwise specified in the contract. Payment will be made under: Pay Item Pay Unit Steel Beam Guardrail Linear Foot Steel Beam Guardrail, Shop Curved Linear Foot Steel Beam Guardrail, Double Faced Linear Foot Triple Corrugated Steel Beam Guardrail Linear Foot 20" Tubular Triple Corrugated Steel Beam Guardrail Linear Foot Temporary Steel Beam Guardrail Linear Foot Temporary Steel Beam Guardrail, Shop Curved Linear Foot Temporary Steel Beam Guardrail, Double Faced Linear Foot Temporary Guardrail End Units, Type __ __ Each Temporary Steel Beam Guardrail Terminal Sections Each Steel Beam Guardrail Terminal Section s Each Triple Corrugated Steel Beam Guardrail Terminal Sections Each Guardrail End Units, Type ___ Each Guardrail Anchor Units, Type ____ Each Temporary Guardrail Anchor Units, Type ____ Each W-TR Steel Beam Guardrail Transition Sections Each 25ʹ Clear Span Guardrail Sections Each Extra Length Guardrail Post ( __ʹ Steel) Each Additional Guardrail Posts Each Temporary Additional Guardrail Posts Each