be included for operation of hydraulic and/or mechanical barriers without
power.
2.5.1.2
Unless otherwise indicated, electric motors shall have [drip-proof]
[totally enclosed] enclosures.
2.5.1.3
System
The system shall be designed to maintain the barriers in the raised
position, without inspection, for periods of time of up to 1 week. If a
hydraulic system is used, it shall be equipped with pressure relief valves
to prevent overpressure.
2.5.1.4
Hydraulic Power Unit
The hydraulic power unit shall contain synthetic biodegradable hydraulic
fluid which maintains its viscosity operating range, even at constant
heaviest use rate, for an ambient temperature range of minus 7 to plus 66
degrees C 20 to 150 degrees F. A hydraulic fluid heater shall be provided
so that the viscosity remains within its operating range if ambient
temperatures below minus 7 degrees C 20 degrees F are expected. Flexible
hydraulic lines shall be used for the connection of the hydraulic power
unit to the barrier. Flexible hydraulic line working pressures shall
exceed the maximum system relief pressure; flexible hydraulic lines shall
be in accordance with SAE J517.
2.5.2
Manual Retractable Portable Barriers
The manual barrier shall be capable of being raised and lowered by manual
means such as levers or hydraulics requiring a maximum 267 N 60 pounds of
force. The manual mechanism shall contain a locking pin which accepts a
padlock for securing the barrier when it is in the "UP" position and shall
also be capable of being locked in the "DOWN" position. Retractable
barrier shall withstand a [_____] kg pound vehicle at impact speed of
[_____] km/hour, mph, with maximum barrier deflection or vehicle
penetration of [_____] m feet.
2.6
PORTABLE CRASH BEAM
The portable crash beam shall be an above-grade assembly that, in the
"DOWN" position, shall present a visible obstacle to approaching vehicles.
The height of the barrier shall be a minimum of 750 mm 30 inches as
measured from the roadway surface to the centerline of the crash beam. The
crash beam shall be capable of blocking a minimum road width of [3.0]
[_____] m [120] [_____] inches. The crash beam end shall contain a locking
pin with padlock acceptance for securing the crash beam when it is in the
"DOWN" position. Crash beam shall withstand a 6804 kg 15,000 pound vehicle
traveling at 48 km/hour 30 mph, with maximum vehicle penetration and/or
barrier deflection of 6 m 20 feet.
2.6.1
Powered Portable Crash Beam
The portable crash beam shall be operated by means of a hydraulic power
system. The crash beam shall be capable of being raised or lowered within
an 8 to 15 second time range.
SECTION 02840
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