811 – IMPACT ATTENUATOR
800-36 Section 811
IMPACT ATTENUATOR 811.1 DESCRIPTION
a.Permanent Impact Attenuator. Install the impact attenuation devices at the locations designated in the Contract Documents.
b.Impact Attenuator (Temporary). When specified as part of project traffic control, install and relocate the temporary impact attenuation devices at the locations designated in the Contract Documents. Stockpile the required replacement m odules for each type of temporary sy stem used on the project at the project site. Install replacemen t modules when damaged. BID ITEMS UNITS Impact Attenuator (*) Each *Type (TL-2, TL-3 or Severe Duty) Impact Attenuator (Temporary) Each Replacement Modules Each 811.2 MATERIALS
a.Permanent Impact Attenuator. Provide the type and model of impact attenuator designated in the Contract Documents or an approved equivalent. The Bureau of Construction and Materials will maintain a list of approved impact attenuators. The Engineer will accept the im pact attenuators based on the brand na me and model, and visual inspection for condition at the point of usage.
b.Impact Attenuator (Temporary). Provide the type and model of impact attenuator designated in the Contract Documents or an approved equivalent. An inertial barrier system is not an approved equivalent. The Bureau of Construction and Materials will mainta in a list of approved impact attenuators. The Engineer will accept the im pact attenuators based on the brand na me and model, and visual inspection for condition at the point of usage.
c.Materials for Base. Provide concrete and reinforc ing steel that comply with SECTIONS 401, 402, 1102 and DIVISON 1600 . 811.3 CONSTRUCTION REQUIREMENTS
a.Permanent Impact Attenuator. Construct the reinforced concrete base according to the applicable portions of DIVISION 700 and as shown in the Contract Documents. Provide the Engineer with a printed copy of the manufacturer’s recommendations for installation of the impact attenuator. Install the impact attenuation device according to the manufacturer’s recommendations.
b.Impact Attenuator (Temporary). Construct the reinforced concrete base according to the applicable portions of DIVISION 700 and as shown in the Contract Documents. Provide the Engineer with a printed copy of the manufacturer’s recommendations for installation of the impact attenuator. Install the impact attenuation device according to the manufacturer’s recommendations. When shown in the Contract Documents, re locate the temporary impact attenuator. Install replacement modules of the temporary impact attenuator when damaged. Unless otherwise noted in the Contract Documents, the temporary impact attenuator and replacement modules are the property of the Contractor upon completion of the project. 811 – IMPACT ATTENUATOR
800-37 811.4 Measurement and Payment
a.Permanent Impact Attenuator. The Engineer will measure each impact attenuator. Payment for the "Impact Attenuator (*) at the contract unit price is full compensation for the specified work.
b.Impact Attenuator (Temporary). When installed as part of project traffic control, the Engineer will measure each temporary impact attenuator. Each unit will be measured only once, even if the unit is relocated on the project. The Engineer will measure each replacement module used on the project. The quantity of replacement modules stockpiled on the project site, but not used on the project, will not be measured for payment. Payment for the "Impact Attenuator (Temporary)" and "R eplacement Modules" at the contract unit price is full compensation for the specified work. 812 - PERMANENT SIGNING
800-38 Section 812
PERMANENT SIGNING 812.1 DESCRIPTION Install highway signs, delineators and object markers as shown in the Contract Documents. B I D I T E M S U N I T S Barricade (Type 3) (Fixed) Each Sign (*1) (High Performance) Square Foot Sign Post (4" x 6" Wood) ( *2) L i n e a r F o o t Sign Post ( *3 Steel Beam) Linear Foot Sign Post ( *4 U Steel) Linear Foot Sign Post ( *5 Perforated Square Steel Tube) Linear Foot Sign Post (4" x 6" Structural Steel) Linear Foot Sign Post (3 I 2.25 Aluminum) Linear Foot Sign Post Stub and Breakaway Base Plate ( *3) Each Sign Post Breakaway Base Plate ( *3) E a c h Sign Post Footing ( *6 Concrete) Linear Foot Sign Post Footing (Sign Post Square Coupler) ( *11) Each Sign Post Footing (*5 Perforated Square Steel Tube) Each Signing Object Marker ( *7) E a c h Signing Delineator ( *8) (*9 Rigid, "U" Post) Each Signing Delineator ( *8) (*9 Flexible) ( *10 Anchor) Each Signing Delineator ( *8) (*9 Bracket) Each S i g n ( R e m o v e a n d R e s e t ) L u m p S u m *1Type of substrate: Flat Sheet, Reinforced Panel or Overlay *2Type of sign: Flat Sheet Sign or Reinforced Panel Sign *3Size and weight of post: W 6 x 9, W 10 x 12 or W 10 x 22 *4Weight per foot: 2 lbs./ft. or 3 lbs./ft. *5Size of post: 1¾ inch, 2 inch, 2¼ inch or 2½ inch *6Diameter: 18- inch wood post, 24- inch stee l beam post or 30- inch steel beam post *7Type: Type 2 or Type 3 *8Type: Type A or Type B *9Color: Yellow or White *10Type: Type 1 or Type 3 *11Size: 2 ¼ inches 812.2 MATERIALS
a.Materials for Permanent Signs.
1.Provide Grade 3.0 concrete for sign post footings that complies with SECTIONS 401, 402 and 1102 . If allowed, provide expanded fo am foundations according to DIVISION 1700 .
2.Provide asphalt material for sealing gaps between the wood posts and the concrete footings approved by the Engineer.
3.Provide steel reinforcement bars, structural steel tubes, anchor bolts , steel fasteners, steel sign posts, steel delineator posts, aluminum sign blanks, aluminum sign overlay panels, aluminum I-beams, aluminum Z-bars and aluminum post clips that comply with DIVISION 1600 .
4.Provide organic zinc-rich paint for repairi ng damaged spelter coatings that complies with DIVISION 1800 .
5.Provide retroreflective sheeting, process inks and flexible delineator posts and anchoring devices that comply with DIVISION 2200 .
6.Provide wood posts and preservative treatment of and drilled holes that comply with DIVISION 2300 . 812 - PERMANENT SIGNING
800-39 b. Shop Fabrication of Signing Items.
1.Flat Sheet Signs. Prov ide flat sheet sign blanks that comply with the Contract Documents. Remove warps, burrs and other defects.
2.Reinforced Panels. Provide reinforced panels of either extrusheet or extrud ed fabrication that comply with the Contract Documents and these requirements: Cut the ends of all panels at 90º angles to within ⅛ inch of the length shown in the Contract Documents. If the panel is extrusheet fabrication, do not exceed a 1/32 inch mismatch between the edge of the sheet and the extrusion it is fastened to. Remove warps, burrs and other defects.
3.Flat Sheet Sign Blank and Reinforced Panel Preparations. After fabrication, prepare the metal for sheeting application using a Class 2 conversion coating according to ASTM B 921, "Standard Specification for Non- hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys". Handle the metal with a mechani cal device or clean canvas gloves, between the etching operation and application of retroreflective sheetin g. Prevent the metal from coming in contact with greases, oils or other contaminants before the application of sheeting, films or inks.
4.Application of Retroreflective Sheeting. Use either heat activated or pressure sensitive retroreflective sheeting of the color shown in the Contract Documents. Apply the sheeting to the treated blanks and panels according to the manufacturer’s recommendation, or by a method that will produce an equivalent result. During fabrication of sign faces co mprised of 2 or more pieces of re troreflective sheeting on reinforced panels, carefully match adjacent pieces of sheeting for color to provide uniform appearance and brilliance under both day and night illumination. Any apparent contrast be tween adjacent pieces of applied sheeting or panels is cause for rejection of the sign. Overlap pressure sensitive sheeting a minimum of 3/16 inch at splices. If heat activated sheeting is spliced, the minimum overlap is 3/16 inch. If adjacent sheets of heat activated sheeting are butted together, the gap between adjacent sheets may not exceed 1/32 inch. On reinforced panel signs, vertical splices a minimum of 4 feet apart are permitted. On flat sheet signs, 1 vertical or horizontal splice is permitted. Make horizontal lap splices with the uppermost piece overlapping the lower piece. Splicing is prohibited if the sign face is made using the reverse screen process. (5) Sign Legend and Border Details. Provide sign legend and border that complies with the requirements specified in the Contract Documents. Use capital letters and numbers that comply with the standard rounded capital letter alphabets in the latest edition of Standard Alphabets for Highway Signs. Use lowe r case letters that comply with the latest edition of Standard Lower Case Alphabet for Highway Signs. Use initial capital letters that are 1 ⅓ times the loop height of the lower case letters, from a modified seri es "E" alphabet in which the stroke width is increased to approximately 1/5 of the height of the letter or number. Make the sign face for flat sheet signs using one of these processes: Direct Screen: the legend and border color is applied to the face of th e sign by the silkscreen process. Reverse Screen: a transparent color is applied to the face of the sign by the s ilkscreen process to form the legend and border. Direct Applied: the legend and border is retrorefl ective sheeting applied to th e face of the sign by the appropriate methods. Digital Printing. Use the Direct Applied process to make the sign face for reinforced panel signs.
6.Application of Process Inks and Lettering Films. Use the color of film or ink to obtain the sign face, legend and border as shown in the Contract Documents. Apply process inks to the sign faces accordin g to the retroreflective sheeting manufacturer’s recommendation, or by a meth od that will produce an equiva lent result. Apply lettering films to the sign faces according to the lettering film manufacturer’s recommenda tion, or by a method that will produce an equivalent result.
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 527–530 of 978.