630.01 Description.
d.Concrete Surface Tolerances and Finishing . The finished concrete shall be within reasonably close conformity to the lines, grades, and dimensions shown on the plans or directed; the barrier s hall present a smooth uniform appearance free from objectional cavities or projections. A 10 foot {3 m} straightedge, laid on the top faces of the barrier, shall not vary more than 0.02 foot {6 mm} from the edge of the straightedge except at grade changes and curves and be free of humps, sags or other irregularities. Concrete surfaces shall be finished in accordance with the requirements given in Section 501 for Class 1 with exposed surfaces receiving a Class 2 coated surface finish .
e.Joints . Joints shal l be in accordance with the provisions of Section 501, except as follows: Surface edges on exposed vertical contraction joints shall be rounded with a 1/4 inch {6 mm} edger or sawed. Vertical expansion joints may be open or sealed in accordance with plan r equirements.
629.04 Method of Measurement.
Concrete barriers will be measured for payment by the appropriate method designated by the plans or proposal in accordance with the following: Item 629 -A – linear foot {meter} measured to the nearest 0.1 foot {0.1 m} along the top surface barrier. Item 629 -B – cubic yards {cubic meters} of concrete with volumetric measure computed by the average end area method except where results obtained differ from those obtained by a more accurate mathematical computation. Item 629- C - unit measurement where each end section is in accordance with the size, shape, and length designated by the plans. Item 629 -D - per each in accordance with the details shown on the plans. One retrofit will be measured for each end of each concret e guardrail where the retrofit is constructed. Item 629 -E - per linear foot in accordance with the details shown on the plans. Excavation and backfill shall be measured in accordance with the provisions of Section 214.
629.05 Basis of Payment.
a.Unit Pr ice Coverage . The various "Types" of Median or Safety Barriers End Sections , and Bridge Guardrail and Rail Retrofit, ordered and accepted, measured as noted above, shall be paid for at the appropriate unit price bid provided in the proposal. Said unit pric e bid shall be full compensation for the furnishing of all materials and the construction of the barrier complete in place, including all equipment, tools, labor, and incidentals necessary to complete the work.
b.Payment will be made under Item No .: 629-A Concrete Median or Safety Barrier, Type ___ - per linear foot {meter} 629-B Concrete Median or Safety Barrier, Type ___ - per cubic yard {cubic meter} 629-C Concrete Median or Safety Barrier End Section - per each 629-D Bridge Guardrail Retrofit, Type ___ - per each 629-E Bridge Rail Retrofit, Type ___ - per linear foot {meter} GUARDRAIL AND BARRIER RAIL
630.01 Description.
This Section shall cover the work of the furnishing and installation of complete sections of steel or aluminum beam guardrail, guardrail end anchor systems, and shaped tube type barrier rail, at the locations shown on the plans or designated and in conf ormity with the detailed requirements of the plans and these specifications. The plans will designate the Class of guardrail to be used and, in the case of steel rail, also the Type to be used. When it is optional as to the choice of either steel or alumin um, the alternate once selected shall be used throughout the contract. Unless specified otherwise, Class A guardrail will be used for roadways and Class B guardrail will be used for bridges.
630.02 Materials.
630.02 Materials.
Materials shall conform to the requirements set forth in Division 800, Materials. Specific reference is made to Section 864, Guardrail and Barrier Rail Materials, and detail drawings provided in the plans. Material will be accepted by Brand Registration and Guarantee, as provided by AASHTO M 180, and L ist II-17 of Materials, Sources, and Devices with Special Acceptance Requirements. Spot checks will be made for material delivered to the project. The material may be accepted or rejected based on these tests. If alternate approved end anchors are shown to be allowed on the plans the Contractor shall obtain a copy of the details from the manufacturer prior to installation. The Contractor shall also obtain a certification from the manufacturer that the end anchors meet the "crashworthy" requirements given in the National Cooperative Highway Research Program (NCHRP) Report 350 or Manual for Assessing Safety Hardware (MASH), 2016, based upon the project requirements . The Contractor shall furnish a copy of the details and certification to the Engineer upon request.
630.03 Construction Requirements.
a.Erection of Posts and End Anchors .
1.General . The Contractor shall place stakes to mark the location where guardrail is required. The Contractor shall not begin the installation of the guardrail posts until the Engineer has approved the staked location of the guardrail.
2.Posts . Unless otherwise provided by the plans or proposal, the Contractor may use one of the optional type posts shown on the plans; however, once selected, the same type shall be used through out the contract. Posts shall be erected in such a manner that they shall be vertical with their top inside edges within 1/4 inch {6mm} of their correct position for both vertical and horizontal line. The posts shall be erected to the dimensions shown on t he plans and compacted by tamping, puddling, or as directed, to obtain a rigid installation. Where posts are driven, the tops shall be protected by a suitable driving cap and the adjacent area compacted, if deemed necessary by the Engineer. If raising or other movement of the post is required, the earth shall be compacted to fill any voids caused by such movement. All posts damaged in any way during erection shall be removed and replaced without additional compensation.
3.End Anchors. The Contractor shall use one of the Type End Anchors provided by the plans, or directed. The anchor assemblies shall be erected to the dimensions shown on the plans, and the area backfilled with suitable material and compacted as provided in Item 2 above. Posts that are attach ed to the anchor assembly shall be erected to the requirements for individual posts as provided in Item 2 above.
b.Erection of Rail .
1.All metal except concrete reinforcement shall be fabricated in the shop. No punching, cutting, burning, or welding sha ll be done in the field. Holes for special details in exceptional cases may be made in the field when approved, after it has been demonstrated that punching will not result in damage to the surrounding metal.
2.The rail may be erected in any manner result ing in a smooth continuous rail closely conforming to the established line and grade of the surface the rail parallels. The top of the rail shall be constructed to the height designated on the plans.
3.Rail shall be erected so that the bolts at expansion joints shall be located at the centers of the slotted holes. Bolts may be rethreaded after galvanizing if necessary. All bolts, except where otherwise required at expansion joints, shall be drawn tight; however, bolts through expansion joints shall be drawn up as tight as possible without being tight enough to prevent the rail elements from sliding past one another longitudinally. Bolts shall be sufficiently long to extend at least 1/4 of an inch {6 mm} beyond the nuts. Except where required for adjustments , bolts shall not extend more than 1/2 of an inch {13 mm} beyond the nuts. Bolts through variable thickness posts shall be cut off 1/4 of an inch {6 mm} beyond the nuts and burred.
c.Metal Treatments .
1.General . All steel elements (posts and rail), including all accessories used in the construction of guardrail and barrier rails shall be galvanized, except when otherwise provided by the plans or proposal.
630.05 Basis of Payment.
Aluminum elements (posts and rail) and accessories will require no special treatment, except where otherwise noted on the plans or proposal.
2.Steel .
a.Galvanized. Painting of galvanized steel will not be required except that any damage to galvanizing or any bare areas developed during construction shall be painted with two coats of approved galvanizing repair paint, Section 855, or approved zinc spelter paint. However, should any galvanized metal be required by the plans or proposal to be painted, the surface shall be treated with a wash of 8 ounces {60 g} of copper or zinc sulphate dissolved in one gallon {liter} of water prior to the application of the required paint surface.
b.Not Galvanized. All metal not galvanized shall be cleaned and painted with one primer coat and two coats of paint, Structural Steel Second and Third Coats (Section 8 55), unless otherwise provided on the plans or in the proposal.
3.Aluminum . Aluminum elements of guardrail or barrier rail require no special preservative treatment unless otherwise noted on the plans.
d.Safety of Traveling Public. At locations where p ublic traffic is adjacent to the guardrail or barrier rail work, all materials required to complete the work at any one location shall be available before beginning the work at that location. Posts shall be erected only far enough in advance to permit the construction to progress consistently, uniformly, and continuously. All posts shall have the rail attached to them the same day that the posts are erected. For installations in which neither end adjoins a fixed object, the installation of the rail shall pr ogress in the same direction as the traffic in the adjacent lane. The intent of this specification is that each guardrail or barrier rail installation erected under traffic be completed, including end anchors and/or attenuating devices, before nightfall of the day on which work on that installation began. In the event that unforeseen conditions prevent the completion of an installation before nightfall, the Contractor will be required, at his expense, to protect and delineate the uncompleted installation by the use of reflectorized devices or other acceptable means. The minimum requirement for this protection and delineation will be one or more reflectorized drums with a Type B warning light on each drum. If the existing guardrail or barrier rail is to be removed and reset, replaced, or relocated, then only one installation ahead of the placing operation may be removed. At any site where the rail has been removed and the new installation has not been completed, the Contractor will be required at his expense t o protect the site with reflectorized drums, with a Type B warning light on each drum, as shown on the plans or directed by the Engineer.
630.04 Method of Measurement.
Posts will not be measured for payment separately. The length of the beam guardrail or barrier rail constructed and accepted will be measured in linear feet {meters} to the nearest 0.1 foot {0.1 m} from the end of each continuous installation, exclusive of designated anchor assemblies along the centerline of the top of the rail posts for guardrail and of the rail element for barrier rail. Standard guardrail installations cover one rail element, its supports (post) and accessories. When installations are to cover special installations such as double -faced rail (two rail elements) mounted on a single post, a separate pay item will be provided and the special condition so noted in the description of the pay item. End Anchor Assemblies shall be measured separately in individual unit assemblies, complete in place, including all hardware and accessor ies to complete the type anchor assembly ordered placed in accordance with plan details.
630.05 Basis of Payment.
a.Unit Price Coverage . Accepted guardrail or barrier rail, measured as provided above, will be paid for at the contract unit price bid per l inear foot {meter} for Beam Guardrail or Barrier Rail which shall be payment in full for excavating, backfill, disposal of surplus material; for furnishing, transporting, erecting of posts and
631.01 Description.
rail; for all incidental material, bolts, brackets, etc., as sh own on the plans; and for all equipment, tools, labor, and incidentals necessary to complete the work. Accepted Guardrail End Anchor Assemblies, measured as provided above, will be paid for at the contract unit price per each, which shall be full compensat ion for excavating, backfilling, disposal of surplus materials, for furnishing, erecting the anchor assembly, and all incidental materials necessary to install the assembly, complete in place, as shown on the plans, and for all equipment, tools, labor, and incidentals necessary to complete the work. Accepted steel beam guardrail for culvert, measured as provided above, will be paid for at the contract unit price bid per linear foot {meter} which shall be payment in full for excavating, backfill, and disposa l of surplus material; for furnishing, transporting, and erecting of posts and rail; for saw cutting and epoxy coating the parapet; for all bolts, brackets, bases, and hardware including any required drilling for installation; and for all equipment, tools, labor, and incidentals necessary to complete the work.
b.Payment will be made under Item No .: 630-A Steel Beam Guardrail, Class ____ , Type ____ - per linear foot {meter} 630-B Aluminum Beam Guardrail, Class ____ - per linear foot {meter} 630-C Guard rail End Anchor, Type ____ - per each 630-G Steel Beam Guardrail for Culvert, Class ____, Type ____Case ____ per linear foot {meter} SECTION 631 GUARDRAIL OR BARRIER RAIL RELOCATED
631.01 Description.
This Section shall cover the work of relocating guardrail or barrier rail and end anchor systems to the established lines and grades at the locations shown by the plans or directed, in conformity with the plans and these Specifications. The relocation shall include the removal, reconditioning, and reinstallation of the rail, posts, hardware, and anchor systems. This Section shall also cover the adjustment (reset) of existing guardrail.
631.02 Materials.
a.Salvaged Material . All portions of the rail elements, posts , and other hardware designated to be reset or relocated shall be cleaned and inspected. Damaged portions shall be discarded or repaired as directed. Damage to galvanization on metal (steel) portions shall be repaired with approved galvanizing repair paint . Posts and rail elements shall be cut or drilled to conform to the requirements of the current plan requirements for the type rail being used. Timber posts shall be coated with one liberal coat of the type preservative used in the original treatment, unle ss the use of another type preservative is authorized by the Engineer. Galvanized steel posts which cannot be repaired satisfactorily with galvanized repair paint shall be painted with an approved aluminum paint.
b.New Materials . New materials shall meet the requirements specified in Section 864, Guardrail and Barrier Rail Material. Paint shall meet the requirements of Section 855, Coatings, Paints, Enamels, and Varnishes for Metal or Wood Structures.
631.03 Construction Requirements.
a.General . The Contractor shall promptly replace, without extra compensation, any materials lost, damaged, or injured on account of carelessness, negligence, or failure to conduct the work properly. Any such replacements shall be with materials conforming to the original ma terial requirements. Should any of the rail, posts, or end anchors included in the relocation or reset items be deemed, by the Engineer, unsuitable for reuse through no fault or negligence of the Contractor, the Engineer may either furnish materials accept able for use or may require the Contractor to furnish new materials.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 514–516 of 934.