870.02 Sand -Filled Impact Attenuation Modules
For roadways open to public travel during work, operate the equipment and store materials and supplies to minimize hazards or inconveniences to the traveling public. Repair pavement or facilities damaged by equipment operation at no additional cost to the Department.
858.05 Method of Measuremen T
The Resident Engineer will measure Pavement Markers separately by counting individual marker classes and types. The Resident En gineer will divide pavement markers into classes and types for measurement and payment in accordance with Table 858:2: Table 858:2 Pavement Marker Classes Class A Retroflective Class B Non -retroreflective Ceramic Type Direction Type Type 1 Mono -directional Yellow Type 2 Bi-directional White
858.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.PAVEMENT MARKERS Each
B.REMOVE AND RESET PAVEMENT MARKERS Each SAND -FILLED IMPACT ATTENUATION MODULES
870.01 Description
This work consists of providing and placing sand -filled impact attenuation modules. A module is considered as one free-standing, frangible unit within the impact attenuation system.
870.02 Materials
A.General Provide sand -filled impact attenuation modules that meet the test requirements, procedures, and results in accordance with NCHRP 350 or MASH T est Level three (TL -3) with letter of acceptance/ eligibility from the FHWA. SAND-FILLED IMPACT ATTENUATION MODULES 870.04 Ensure each module consists of a barrel, a lid, and sand material. Provide high density thermoplastic (polyethylene or polypropylene) barrels and lids that shatter on impact. Provide modules designed to distribute the sand mass without spontaneous rupture of the outer container or collapse of the inner core. Provide a yellow outer container, unless otherwise shown on the Plans, in accordance with the standard highway color code re quirement in the MUTCD. As a replacement supply, provide the number of additional modules of each capacity as shown on the Plans. These unassembled modules will become the property of the Department. Deliver to the nearest Department warehouse approved b y the Resident Engineer.
B.Barrels Provide yellow barrels molded in one or multiple parts that resist ultraviolet (UV) weathering degradation. Provide barrels capable of supporting and containing 200 lb [90 kg], 400 lb [180 kg], 700 lb [320 kg], 1,400 lb [640 kg], and 2,100 lb [960 kg] of sand at the heights required by the Contract without leaking.
C.Lids Provide a polyethylene lid from ⅛ in to ⅜ in [3 mm to 9 mm] thick that resists deterioration from UV rays. Ensure the lid clamps or press -fits over t he outer container to seal the module.
D.Sand Ensure the sand mass and sieve analysis for each module meets the manufacturer’s recommendations and contains no greater than 2 percent moisture by dry weight of the aggregate at the time of placement.
E.Certification Submit a Type D Certification to the Resident Engineer in accordance with Subsection 106.04, “Material Certifications, ” for each lot or module shipment.
870.03 Equipment — Vacant
870.04 Construction Methods
Place the modules in the configuration for each location as shown on the Plans. Paint the outline of the base of each module on the surface of the pavement or apron. Within the outline, paint the weight of the sand mixture for each module using 4 in [100 mm] high numbers. To prevent modules on sloped surfaces greater than 5 percent from moving or overturning, attach a half-ring block or other leveling device to the pavement or apron surface under the module. While placing each module in the final position, fill within 10 lb [4.5 kg] of the sand mass required by the Contract. Fill the module with sand to the heights required by the Contract.
870.06 Sand -Filled Impact Attenuation Modules
After filling the module, place and fit the lid. For non -self-securing lids, drill four holes, with ¼ in [7 mm] diameters, through the perimeter of the lid and outer container at equidistant points around the module perimeter. Secure the lid with four pop rivets. Mount Type I object marker (OM -1) on the delineator post in front of the attenuator pad, or on the first drum in a manner approved by the Resident Engineer.
870.05 Method of Measuremen T
A.Permanent Installations Provide new materials. The Resident Engineer will measure modules, including component parts, by the unit as shown on the Plans. The Reside nt Engineer will measure delivered replacement modules by the unit as shown on the Plans.
B.Temporary Installations For modules temporarily used in construction work zones, the Resident Engineer will not measure the installed replacement modules. Maintain enough sand -filled replacement modules to provide replacement of 35 percent of the total modules in use on the Project. Upon Project completion, retain ownership of sand -filled impact attenuation modules used for temporary installations, unless otherwise shown on the Plans.
C.Removal of Existing Installations Remove and dispose of existing modules not used during construction or not remaining in place after Project completion.
870.06 Basis of Payment
The Department will pay for each pay item at the contra ct unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.SANDFILLED IMPACT ATTENUATION MODULE Each or Sign Day
B.REPLACEMENT IMPACT ATTENUATION MODULE Each
C.REMOVAL OF EXISTING IMPACT ATTENUATION MODULE Each Include the cost of sand, paint, and object markers in the contract unit price for Sand Filled Impact Attenuation Module . Include the cost of maintaining replacement modules in stock in the contract unit price for Sand Filled Impact Attenuation Module . TRUCK MOUNTED IMPACT ATTENUATORS 876.05 SECTION 876 TRUCK MOUNTED IMPACT ATTENUATORS
876.01 Description
The work consists of providing, installing, operating, maintaining, and relocating truck mounted impact attenuators. This work also cons ists of providing, stockpiling, and moving repair packages.
876.02 Materials
Provide truck mounted impact attenuators with the following components: Crushable cartridge encased in a shell, Backup and support assembly to attach the backup to the truck, and Truck with a minimum gross vehicle weight over 15,000 lb [6,800 kg], or A trailer meeting all of the above specifications. Provide a truck chassis to mount the impact attenuator with a clearance from 11 in to 13 in [280 mm to 330 mm] between the bottom of the shell and the roadway. Provide truck mounted attenuators in accordance with the test requirements, procedures, and results in NCHRP 350 or MASH Test Level Three (TL -3) with letter of acceptance/eligibility from the FHWA. Submit certified test results meeting the test and performance criteria in accordance with NCHRP 350 or MASH. Provide the truck mounted impact attenuator cartridge with a standard trailer lighting system. Provide a minimum 90° tilt system with a mechanical locking device to secure the truck mounted attenuator cartridge in the 90° position.
876.03 Equipment — Vacant
876.04 Construction Methods
Do not park truck mounted impact attenuators against rigid objects, except as a temporary safety measure until installation of a permanent crash attenuator. Use this method for no longer than 72 hr or as shown on the Plans. Install the attenuator on the truck in accordance with the manufacturer’s recommendations. During truck mounted attenuator operations, stockpile the truck mounted impact atten uator replacement packages on the project or at another local site approved by the Resident Engineer. If repairing the truck mounted impact attenuator, ensure traffic safety through the construction area or suspend construction activities. Immediately rep air or replace damaged truck mounted attenuators.
876.05 Method of Measuremen T — Vacant
The Resident Engineer will measure Truck -Mounted Attenuator by the maximum number in use at any one time during the Project.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 902–904 of 935.