Rev. 9-1-95
IMPACT ATTENUATOR TYPE MP
601-R-184
DESCRIPTION. This work shall consist
of the fabrication, assembly, and installation of impact
attenuator type MP, in accordance with the manufacturer's
recommendations, these requirements, and as shown on the plans.
MATERIALS. The Contractor shall have
the option of utilizing the gravel barrel array or the
Combination Attenuating Terminal. The gravel barrel array shall
be either the Fitch Inertial Barriers as manufactured by FIBCO,
Inc. or the Energite System Inertial Barriers as manufactured by
Energy Absorption Systems, Inc. The Combination Attenuating
Terminal shall be as manufactured by the Syro Steel Company. The
configuration of the selected alternate unit shall be as crash
tested and approved in accordance with FHWA requirements. If the
Combination Attenuating Terminal unit is used, it shall include
the transition section. If the gravel barrel array is used, it
shall include the concrete pad. The concrete shall be class A in
accordance with 702. The size and orientation of the concrete pad
shall be as shown on the plans. The gravel used in the barrels
shall be uncrushed coarse aggregate size No. 12 in accordance
with 904.02. The required weight of gravel for each barrel shall
be as shown on the plans.
CONSTRUCTION REQUIREMENTS. Assembly
and installation shall be supervised or performed at all times by
an installer trained and certified by the unit's manufacturer,
and shall be in accordance with the manufacturer's
recommendations at the locations shown on the plans. The grading
required for the installation of the impact attenuator type MP
shall be as shown on the plans. A copy of the installer's
certificate shall be presented to the Engineer prior to the start
of work.
The Contractor shall provide the
Department with original copies of all necessary current
manufacturer's installation manuals and shop drawings prior to
beginning installation work. Shop drawings shall be a minimum of
560 mm by 865 mm (22 in. by 34 in.) in size. These manuals and
drawings shall remain the property of the Department.
In case of dispute regarding
installation, the manufacturer shall provide a properly trained
representative, directly employed by the manufacturer, to ensure
that the installation is performed in accordance with the
manufacturer's recommendations.
METHOD OF MEASUREMENT. This work will
be measured by the number of units installed.
BASIS OF PAYMENT. This work will be
paid for at the contract unit price per each for impact
attenuator type MP, complete in place. The costs of all
materials, grading, labor, equipment, and necessary incidentals
shall be included in the cost of this work.