294 ALASKA 2020 SECTION 606
606-1.01 DESCRIPTION . Construct new guardrail, terminal sections, and transition rail of the
kind and type specified. Remove and reconstruct or remove and dispose of existing guardrail, terminal sections, and transition rail.
606-2.01 MATERIALS. Use materials that conform to the follow ing:
Concrete Section 550, Class B Flexible Delineator Posts Section 730- 2.05 Guardrail Connection Plate Section 722 Guardrail Hardware Subsection 710- 2.07 Guardrail Posts and Blockouts Subsection 710- 2.06 High Strength Bolts Section 722 Metal Beam Rail Subsection 710- 2.04 Terminals Subsection 710- 2.11 Wire Cable Subsection 709- 2.02 Terminal Markers. Single piece marker, meeting the requirements of Section 730- 2.05 Flexible Delineator Posts. Post-mounted flexible delineators. Single piece marker, meeting the requirements of Section 730- 2.05 Flexible Delineator Posts. Furnish terminal markers, color as shown on the plans, nominally 0.125 by 3.75 inches by 66 inches long or as shown on the plans, with a 3 inch by 12 inch retroreflective sheeting matching the color of the adjacent lane line, or as shown on the plans. Furnish post -mounted flexible delineators with retroreflective sheeting, color and dimensions as shown on the plans. Fabricate side- mounted guardrail reflector assembly brackets from aluminum alloy. Retroreflective sheeting for terminal markers, post -mounted flexible delineators, and side- mounted guardrail reflectors shall meet ASTM D4956 requirements for Type VIII, IX, or XI.) CONSTRUCTION REQUIREMENTS
606-3.01 GENERAL. Install guardrail a nd terminals at the locations shown on the Plans. Conform
with the Alaska Standard Plans and these Specifications. At locations where public traffic is adjacent to guardrail work, have all materials on site, including crashworthy terminals, that are requir ed to completely install a segment of guardrail before beginning work on that segment. Start guardrail installation at the “upstream” end (the end adjacent traffic will encounter first) by either installing a crashworthy terminal or connecting to an existi ng barrier. Continue installation in the direction of traffic. Exception: if the guardrail run will connect to existing barrier, buried in the backslope, or guardrail, existing or new bridge railing, or other existing structure at the “downstream” end, guardrail installation may be started at the point of connection. Do not leave posts installed for guardrail within the clear zone for more than 48 hours before installing the rail. At the end of each work shift, install drums or Type II barricades with flashing warning lights to delineate incomplete sections of guardrail and terminal sections. 295 ALASKA 2020 If guardrail runs are not completed within 10 calendar days after beginning installation, install temporary crash cushions meeting Subsection 643- 2.02 at all non- crash worthy guardrail ends within the clear zone. Apply Traffic Price Adjustment if the Contractor does not comply with the crash cushion requirement. Where necessary, adjust the height of existing guardrail to provide a smooth transition to new guardrail. Use 25 linear feet of guardrail or two 12’ 6” pieces of guardrail to transition to match the existing or new guardrail elements and/or end treatments. After shaping the slopes and staking proposed guardrail terminal section locations, request the Engineer to f ield verify their locations. Receive approval of the staked locations before installing terminal sections. Treat field cuts to timber posts and blockouts according to AWPA standard M 4. Install blockouts according to manufacturer’s recommendations and as s hown on the plans. Install side -mounted guardrail reflectors and post -mounted flexible delineators as follows:
1.At intervals noted on the plans or Alaska Standard Plans, starting with the first mid- span hole beyond terminal sections
2.With the retroreflective sheeting facing approaching traffic
3.With retroreflective sheeting on both sides, on two- way roadways
4.Not on the terminal sections Attach terminal markers, in a vertical position, to the P.T. post of Short Radius Guardrail sections and to the post where t he flare begins for parallel guardrail terminals. Coordinate terminal marker locations with the Engineer. At the end of each work shift, install drums or Type II barricades with flashing warning lights to delineate incomplete sections of guardrail and ter minal sections.
606-3.02 POSTS. Set posts to accommodate the line, grade, and curvature shown on the Plans.
Use either wood or steel posts when allowed by the type of guardrail specified, subject to the following:
1.Use one type of post material on the project unless extending an existing run of guardrail.
2.Match existing post material to extend an existing run of guardrail. Set posts as follows:
3.Set posts plumb, in the location and to the depth shown on the Plans or Alaska Standard Plans.
4.Choose an installation method that does not damage the post, adjacent pavement, structures, utility conduits, and final slopes. Repair all damage to the satisfaction of the Engineer, or replace the damaged item, as per subsection 105- 1.11.
5.Set wood or steel posts in dug, dr illed, or pre- punched holes. Steel posts may also be set by ramming or driving if:
a.The underlying material is no larger than six inch; and
b.The posts are not damaged during installation. 296 ALASKA 2020 6. For placement in solid rock or broken rock embankment greater than si x inch, set wood or steel posts in pre- dug, pre- drilled, or pre- punched holes.
7.Backfill and compact around posts with material as specified in the typical section to firmly support the post laterally and vertically. Compact under and around posts to the Engineer’s satisfaction.
606-3.03 BEAM RAIL. Fabricate metal work in the fabricator’s shop. Bend curved guardrail
elements with radii less than or equal to 100 feet in the fabricator’s shop or with an approved bending apparatus. Receive approval before field punching, cutting, or welding. Repair damaged spelter coat areas on galvanized rail elements according to AASHTO M 36. Lap rail elements so that the exposed ends face away from approaching traffic in the adjacent lane. Use bolts long enough to extend at l east 1/4 inch beyond the nuts. Except where required for adjustments, do not extend bolts more than 1 inch beyond the nuts. Locate bolts at expansion joints at the center of the slotted holes. Tighten bolts at expansion joints to snug- tight. Make all other bolts fully -tight.
606-3.04 CABLE RAIL. Install cable guardrail according to the Plans and Specifications. Install at
the locations shown on the Plans.
606-3.05 Terminal Se Ctions .
1.Parallel Terminals . Install terminal sections according to the manufactur er’s recommendations for the entire length of the terminal then, if required, transition rail height over 25’ to match guardrail height and splice location. Install where shown on the Plans. Follow Section 203 for excavation and embankment requirements. Install ASTM D4956 Type III, IV, or V retroreflective sheeting on the end section of parallel terminals consisting of yellow and black bars sloping 45 degrees downward toward the traffic side of the terminal according to guidance for Object Markers for Obstr uctions Adjacent to the Roadway in Chapter 2C of the Alaska Traffic Manual .
2.Buried- in-Backslope Terminals . Install buried- in-backslope terminals where shown on the plans. If required, transition rail height over 25’ to match guardrail height and splice location. Attach terminal markers, in a vertical position, to the first post of each parallel guardrail terminal, and to the post where the flare begins for parallel guardrail terminals and buried- in-backslope terminals. Orient terminal markers to face traffic approaching in the near lane. Coordinate terminal marker locations with the Engineer.
606-3.06 REMOVAL AND RECONSTRUCTION OF G UARDRAIL. Remove and reconstruct
guardrail as specified. Replace lost or damaged materials without extra compensation.
606-3.07 REMOVAL AND DISP OSAL OF EXISTING GUA RDRAIL. Remove the existing
guardrail shown on the Plans, including the rail, cable elements, terminal sections, hardware, posts, concrete bases, and steel tubes. Backfill resulting holes with material in 6- inch laye rs that is similar to the existing embankment and compact to the same approximate density. Removed items become your property. 297 ALASKA 2020 606-3.08 ADJUST EXIS TING GUARDRAIL. When called for on the Plans, reset existing guardrail to the height shown on the applicable Alaska Standard Plan, measured from the top of the rail to the finished shoulder surface below the rail. Raise and lower the posts several times to prevent settlement and then re- drive them to the height shown on the Plans. Use other methods if approved.
606-3.09 INSTALL NEW GUARDRAIL . Install guardrail as shown on the applicable Alaska
Standard Plan, measured from the top of the rail to the finished shoulder surface below the rail. Install MASH Test Level 3- compliant W31 guardrail as shown on the plans. I nstall new guardrail in conformance with tolerances shown on the plans.
606-4.01 METHOD OF M EASUREMENT . See Section 109 and as follows:
1.Guardrail . Measured along the face of the rail or cable, from the center of the end posts. Short Radius Guardrail. Per each, installed in place. When the guardrail is connected to a terminal section, the pay limit for the rail ends where the specified terminal section begins.
2.Terminals . Per each, installed in place.
3.Transition Rail (Bridge Rail Thrie Beam Transition) . Per each accepted connection.
606-5.01 Basis of Pa Yment .
Payment for temporary crash cushions installed to protect motorists from guardrail installations that have not been completed within 10 calendar days of beginning installation is subsidiary to other it ems.
1.Guardrail . Side -mounted guardrail reflectors, post -mounted flexible delineators, terminal markers, guardrail beam, posts, blockouts, and associated hardware are subsidiary. Installation of downstream anchors, transitions for rail height and splice locations, long span guardrail sections, and guardrail stiffening sections are subsidiary to guardrail installation.
2.Short R adius Guardrail Sections . The contract price includes all materials from the terminal anchor to and including the first wood or steel post of standard guardrail or guardrail end terminal, and including the terminal anchor assembly, in- line anchor, terminal posts, CRT posts, rail elements, terminal markers, and associated hardware required for a complete installation.
3.Terminal Sections.
a.Parallel Guardrail Terminal. The contract price includes rail elements, posts, blockouts, pipe sleeves, cable assemblies, guardrail extruders, terminal markers, and all associated hardware required for a complete installation.
b.Buried in Backslope Guardrail Terminal. The contract price includes rail elements, posts, blockouts, anchors, and all associated hardware required for a complete installation.
4.Transition Rail . The contract price includes all brackets, beam sections, transition pieces, and all posts an d associated hardware required for a complete connection of the guardrail section to a bridge rail or barrier. All material required for embankment widening for guardrail and terminal sections is paid for under the appropriate pay items shown in the bid sc hedule. 298 ALASKA 2020 Payment will be made under: PAY ITEM Item Number Item Description Unit 606.0001.____ W-Beam Guardrail LF 606.0002.____ Thrie Beam Guardrail LF 606.0003.____ Box Beam Guardrail LF 606.0004.____ Cable Guardrail LF 606.0005.____ Removing and Re constructing Guardrail LF 606.0006.____ Removing and Disposing of Guardrail LF 606.0008.____ Double -faced, W -Beam Guardrail LF 606.0009.____ Short Radius Guardrail EACH 606.0013.____ Parallel Guardrail Terminal EACH 606.0014.____ Buried in Backslope G uardrail Terminal EACH 606.0015.____ Adjust Existing Guardrail LF 606.0016.____ Transition Rail EACH 606.0017.____ Removing and Disposing of Guardrail LS 299 ALASKA 2020 SECTION 607 FENCES
607-1.01 DESCRIPTION . Construct fence and gates. Reconstruct fences previous ly removed.
Include barbed wire, where shown on the Plans. Woven wire fence consists of galvanized woven wire fence fabric, metal posts, and all fittings and hardware. Chain link fence consists of chain link fence fabric, metal posts, and all fittings and hardware. The height of chain link fences must conform to the Plans or as designated in the bid schedule. Barbed wire consists of galvanized barbed wire and all fittings and hardware required for fastening to either a woven wire fence or a chain link fenc e, as shown on the Plans.
607-2.01 MATERIALS. Use materials that conform to the following:
Concrete Section 550, Class W Barbed Wire Subsection 710- 2.01 Woven Wire Subsection 710- 2.02 Chain link Fabric Subsection 710- 2.03 Fence Posts Subsection 710- 2.05 Any one of the types of chain link fabric specified in Section 710 may be furnished under Item 607.0003.____, Chain link Fence. Intermixing fabric types is not allowed.
607-3.01 CONSTRUCTIO N REQUIREMENTS. Clear and grub as necessary to construct the
fence to the required grade and alignment. Before installing fence, grade the existing ground along the fence line to a smooth, uniform surface so there are no abrupt grade changes between adjacent fence posts. At locations where breaks in a run of fencing are required, or at intersections with existing fences, adjust post spacing to conform to the requirements for the type of closure indicated. When the Plans require that posts, braces, or anchors be imbedded in concrete, install temporary guys or braces as requir ed to hold the posts in proper position until the concrete has set sufficiently to hold the posts. Do not install any materials on posts or place strain on guys and bracing set in concrete until 7 days after placing the concrete. Set the tops of all posts to the required grade and alignment. Do not cut the tops of the posts. In areas where muck excavation is designated on the Plans or in unstable areas as determined by the Engineer, drive fence posts as shown on the Plans or as directed. Attach the required size and type of wire or fencing firmly to the posts and braces in the manner indicated. Stretch all wire taut and install it to the required elevations. At each location where an electric transmission, distribution, or secondary line crosses any of the types of fences covered by these Specifications, furnish and install a ground rod and connection to the fence meeting the requirements of Section 9 of the NESC. Place ground rods and connectors at maximum intervals of 400 feet along the fence. When fence runs are less than 400 feet long, place one ground rod with connection to the fence. Coordinate fence construction operations so that livestock do not escape. Connect existing cross fences to the new posts. Place braces for every direction of strain at the j unction with existing fences. Fasten the wire in both fences properly to the posts. At bridges, cattle passes, and at
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 322–326 of 584.