630 Page 424630 STEEL BEAM GUARDRAIL
630.1DESCRIPTION
This work consists of furnishing and installing steel beam guardrail.
630.2MATERIALS
A.Wood Posts and Offset Blocks: Wood posts and offset blocks will be made of a timber with a stress grade of at least 1200 psi. Stress grading will be in accordance with the rules of the West Coast Lumber Inspection Bureau, Southern Pine Inspection Bureau, or other appropriate timber association. Timber for posts will either be rough sawn or surfaced 4 sides (S4S) with nominal dimensions indicated. The size tolerance of the posts in the direction parallel to the axis of the bolt holes will not be more than ±1/4 inch. Posts and blocks with checks or cracks more than 1/4 inch wide and deeper than 3 inches will not be acceptable. Post and blocks will be treated as set forth in Section 950 after all end cuts are made and holes are drilled. B.Beam Guardrail: Beam guardrail will conform to AASHTO M 180, Type I, unless the plans specify another type. C.Bolts, Nuts and Washers: Bolts, nuts, and washers will be as specified in AASHTO M 180. D.Concrete: Concrete will conform to Class M6 as specified in Section 462.
630.3CONSTRUCTION REQUIREMENTS
A.Guardrail Alignment: Posts and rail will be set to the plans shown alignment using a string line or other approved methods. B.Posts: Posts will be set plumb. When posts are installed in augured or dug holes, the holes will be backfilled with material approved by the Engineer. The backfill will be placed and compacted in 4 inch lifts, using a mechanical tamper with an appropriate sized tamping head without displacing the post alignment. Surplus excavated material will be disposed of at locations approved by the Engineer. In lieu of the above requirements, post may be set by driving. Driving will be accomplished by mechanical means, which will give the necessary accuracy of placement without any damage. Damaged posts will be replaced at the Contractor’s expense. Regardless of the method of setting posts, the posts will be firm, and at the locations, spacing, and height shown on the plans. When guardrail posts are installed through asphalt concrete shoulders, the Contractor will take care to minimize damage to the asphalt concrete. If during post installation the asphalt concrete shoulder is raised more than 2 inches, lowered more than 1 inch, or otherwise damaged, the Contractor will repair the damaged shoulders. 630 Page 425The method of repair may require patching, recompacting, or removal and replacement of the affected asphalt concrete. The method of repair is subject to the approval of the Engineer, depending on the type and extent of the shoulder damage. All repair costs will be at the Contractor’s expense. Drilling postholes in pavement will be done without damage to the surrounding pavement. The Engineer must approve the proposed drilling method and equipment before the work begins. Upon completion of the installation of the guardrail posts, the Contractor will place and compact asphalt concrete or asphalt concrete cold mix material around the posts to fill and level any voids created by the driving of the posts through the asphalt concrete. The material will be placed 1/2 inch to 1 inch high around the posts to force water to flow away from the post-hole. Cost for this work will be incidental to the contract unit prices for the various guardrail items. Field cuts and bored holes in treated wood will be field treated in accordance with the requirements of AWPA Standard M4. C.Rails: The rail elements will be ready for assembly when delivered to the project site. Welding of rail elements will not be allowed. Field cutting of rail elements will be accomplished with a plasma cutter or other method approved by the Engineer. All field made cuts or holes will be a neat line. Rail elements that have been altered in the field or have been damaged in transporting, handling, or installing will be repaired at the Contractor’s expense. The altered or damaged surface area of rail element will be thoroughly cleaned and painted with two coats of matching zinc-rich paint. When nested rail is specified, rail elements will not be staggered. D.W Beam End Terminal: The W beam end terminal to be used will be the Contractor’s choice selected from the Department’s Approved Products List unless otherwise specified on the plans. The W beam end terminal is to be installed according to the manufacturer’s installation instructions. A copy of the installation instructions and drawings for the W beam end terminal being installed will be furnished to the Engineer prior to installation. The drawings will contain all components of the W beam end terminal. Surfacing and embankment will be placed as detailed on the standard plates. E.Remove Beam Guardrail: Beam guardrail removed, including end terminals, steel beam rail, posts, blocks, and hardware will become the property of the Contractor unless otherwise noted on the plans. Any holes left after removal of the guardrail will be backfilled with material furnished by the Contractor. Wherever posts were set through asphalt, the top 3 inches of the hole will be backfilled with bituminous mix. F.Completion Requirements: On projects where existing cable or steel beam guardrail is to be removed and replaced or reinstalled and the roadway will be open to traffic during construction, the guardrail installation will be completed within 14 calendar days from the day the controlling item of 630 Page 426work is sufficiently complete to allow guardrail installation. A guardrail installation is defined as each individual run of guardrail (i.e., a typical bridge would have 4 guardrail installations). Controlling items for guardrail include, but are not limited to structure, structure end block, and surfacing work. Typically, there will be a sequence of controlling items for guardrail. Prior to any guardrail removal, the Contractor will submit, and the Engineer must approve a written construction schedule for work in the guardrail area. In no case will work cease between controlling items of work for more than 4 working days. Once the existing guardrail is removed from a bridge end, box culvert, bridge column, etc., the Contractor will place drums or Type II barricades at 25 foot intervals at each location where existing guardrail is removed. These devices will extend 175 feet beyond the item of concern for each direction of traffic. Drums and barricades will remain in place until new guardrail has been installed. Cost for furnishing, installing, and maintaining drums and barricades will be incidental to the contract lump sum price for traffic control miscellaneous. Post end, beam, and end terminal sections will be installed in a continuous operation within each individual run of guardrail. Incomplete guardrail installations will be marked by delineation as noted in the previous paragraph. If the Contractor does not complete the required work within the time allowed, the Contractor will install an approved safety treatment that complies with crashworthy requirements for test level 3 of National Cooperative Highway Research Program (NCHRP) Report 350 or the AASHTO Manual for Assessing Safety Hardware (MASH) to protect the site at no additional cost to the Department.
630.4METHOD OF MEASUREMENT
A.Beam Guardrail: Each class and type will be measured to the nearest 0.1 foot along the centerline of the rail. The length in feet will be the overall length center to center of end posts or to connections with bridges. B.W Beam End Terminal: The quantity will be the actual number installed. C.Remove Beam Guardrail: Remove Beam Guardrail will be measured to the nearest 0.1 foot along the centerline of the rail.
630.5BASIS OF PAYMENT
A.Beam Guardrail: Beam guardrail will be paid for at the contract unit price per foot for each class and type installed. Payment will be full compensation for labor, materials, equipment, and incidentals required. B.W Beam End Terminal: W beam end terminals will be paid for at the contract unit price per each. Payment will be full compensation for labor, materials, equipment, and incidentals required. C.Remove Beam Guardrail: Remove Beam Guardrail will be paid for at the contract unit price per foot. Payment will be full compensation for the backfill of holes and the removal of the guardrail including end terminals, beam guardrail, posts, blocks, and hardware from the project limits. 632 Page 427632 HIGHWAY SIGNS AND DELINEATORS
632.1DESCRIPTION
This work consists of furnishing materials, making and preparing signs and delineators, erection and installation of signs and delineators, and performing incidental work.
632.2MATERIALS
Materials will conform to the following sections: A.Highway Signs and Delineators: Section 982. B.Reinforcing Steel: Section 1010 . C.Concrete: Section 462. D.Bolts: High-strength bolts will conform to Section 972. Bolts for mounting sign panels to posts and backing hardware will conform to Section 982.
632.3CONSTRUCTION REQUIREMENTS
Highway signs, delineators, and object markers will comply with the current edition of the MUTCD and Standard Highway Signs, issued by the U.S. Department of Transportation, FHWA. A.Signs: 1.Location and Position: The location of each sign will be established by a stake bearing the sign number as determined from the plans. Posts will be in a plumb position and the flanges of structural shape posts or other supports will lie in the same plane. The post will not extend above the top of the sign. Extruded panels will be flat and straight and will be erected on the posts in a leveled position with the face of each extrusion flush with adjoining extrusions. Bolted connections between adjoining panels will be straight. Offsets or gaps exceeding 1/16 inch will not be permitted. 2.Post Size: Post size will be as specified in the contract for each sign. Sign post lengths shown in the contract are estimates for bidding purposes only. The Contractor will field verify the post length prior to ordering. 3.Date Decal: The Contractor will affix a date decal to each new sign installed. The date decal is a 2 inch by 2 inch self-adhesive sticker with removable paper backing. The date decal displays the last two digits of the year the sign was installed and will consist of two contrasting colors. The date decal will be placed in the lower left corner on the back of flat aluminum signs. The date decal will be placed in the lower left corner on the front of extruded aluminum signs. The date decal on extruded aluminum signs will be of the same color as the background of the sign and will be retroreflective. Sign supports and other