70' Aerial Rear Mounted Turret.pdf
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- Solicitation number
- 300000171075521
- Issued by
- Missouri
About this file
This is a technical specification document for a 70-foot truck-mounted aerial platform device with rear-mounted turret to be provided by MoDOT (Missouri Department of Transportation). The specification outlines requirements for a single aerial lift unit that will be mounted on a MoDOT-provided cab and chassis. The device must achieve a minimum attainable height of 65 feet from ground level to the bottom of the platform and a maximum horizontal reach of at least 58 feet from the centerline of rotation. The aerial platform must be capable of supporting a rated capacity of not less than 500 pounds in any boom position and include a three-section boom with two hydraulically telescoped sections that can rotate 98 degrees total (80 degrees above horizontal to 18 degrees below horizontal). The specification includes detailed configuration requirements for the platform, boom construction, lift and extension systems, leveling mechanisms, rotation systems, stability testing per ANSI A92.2 standards, and a heavy-duty hydraulic boom winch rated for 5,000 pounds bare drum capacity with anti-2-block protection. The unit must be stabilized by four hydraulically operated outrigger assemblies and include comprehensive operator control systems with both platform and lower control stations.
The specification requires the aerial device to be equipped with an open-center hydraulic system with 2,500-psi minimum design pressure powered by a 14 GPM gear pump driven by a cable-shift PTO, a 35-gallon hydraulic oil reservoir with filtration systems, and an emergency lowering system operable from both upper and lower control stations. All cylinders, hoses, and hydraulic fittings must be of domestic convention without metric adapters. The specification mandates compliance with domestic manufacturing standards, including 70,000-PSI minimum high-strength steel for boom construction, domestic-manufacture hydraulic pumps, and micro-honed cylinder tubing with chrome shafts. The vendor must provide two complete sets of operating and maintenance manuals, one safety video, two safety harnesses with 72-inch lanyards, and install cab equipment including a master control switch, dry chemical fire extinguisher, and operator's manual holder. The recommended minimum chassis requirements include a 33,000-pound GVWR with 156-inch CA and 84-inch AF, with the MoDOT chassis to be drop-shipped to the vendor for completion and assembly.
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Text version
70’ TRUCK MOUNTED AERIAL PLATFORM DEVICE,
“REAR” MOUNTED TURRET (WITH MODOT PROVIDED CAB/CHASSIS)
I. CONFIGURATION
A. UNIT
1. Aerial device shall include base assembly supporting rear mounted rotating turret, hydraulically powered rotation mechanism.
2. Boom shall consist of three sections with two sections telescoped hydraulically.
3. The boom shall attain an arc of travel no less than 80 degrees above horizontal to 18 degrees below horizontal, 98 degrees total.
4. All sharp edges on the unit and the boom(s) shall be rounded off for safety.
B. PLATFORM
1. Aerial device shall be provided with one removable rotating platform manufactured of steel.
2. Platform shall be attached to the leveling frame with a self-guided self-latching detachable mount.
Attachment and removal must be accomplished utilizing the boom hydraulics. No manual lifting permitted.
3. In addition to a self-latching pin mechanism, the detachable mount shall have a safety lock pin.
4. The platform detachable mount shall be hinged to the leveling frame utilizing flanged bearings.
5. Platform shall include a hydraulic cylinder rotator capable of allowing the operator to move the platform horizontally through an arc of no less than 45 degrees right and 45 degrees left of normal position.
6. Platform shall be rectangular in shape.
7. Platform dimensions shall be 30 inches x 54 inches.
8. Platform rails shall be 40 inches in height.
9. Platform shall be built per ANSI A92.2.
10. Platform shall be equipped with safety chain on opening.
11. The platform shall be equipped with two safety lanyard attachments.
C. BOOM CONSTRUCTION
1. The boom shall be constructed of high-strength steel rectangular tube sections with 70,000-PSI min.
2. The boom assembly shall include heavy-duty cylinder fittings, heavy pivot pins and replaceable, ultra-high molecular weight polyethylene wear plates.
3. The boom shall be equipped with a steel cable carrier mounted external to the boom.
4. The cable carrier shall be stowed in the open without cover.
D. CAPACITY
1. The rated capacity of the platform shall not be less than 500 pounds in any boom position.
E. LIFT
1. Lift shall be accomplished with one 7” I.D. double-acting, 62” stroke cylinder.
2. Lift cylinder shall come equipped with a holding valve to prevent boom from falling in event of hose failure.
F. EXTENSION
1. Extension shall be accomplished using two opposing “piggyback” double acting 3” I.D. cylinders, 2” diameter rod, and interconnecting the three boom sections (no cables).
2. The cylinder shall be pinned in place and equipped with holding valves for both in and out.
II. PERFORMANCE
A. Attainable height of the unit as measured from ground level to the bottom of the platform shall not be less than 65 feet.
B. The maximum attainable horizontal reach of the unit as measured from the centerline of rotation to the centerline of the platform shall not be less than 58 feet.
III. MOUNTING
A. Aerial turret box shall be sub-frame mounted to the chassis of the carrying vehicle by bolting. If sill strips are used, they must be made of steel. Wood or other organic materials are not acceptable.
B. Aerial unit turret shall be located at the rear of the carrying vehicle so that the platform will stow at the front of the vehicle.
C. Any overhang of the stowed aerial device in relationship with front of the vehicle shall not exceed three feet.
D. The unit, when mounted on the carrying vehicle and in the stowed position, shall not exceed a 13 feet 6 inch travel height (as measured from the highest point of the unit to ground level). This is attainable assuming truck frame is 42”.
E. Torque frame from main to rear outriggers shall be a box structure 11” H x 34-1/2” W.
IV. BOOM STORAGE
A. The vehicle shall be provided with a permanently installed boom rest behind the truck cab that is structurally mounted to the forward outriggers or truck frame.
B. The boom rest shall be of adequate design as to withstand stow loads from the unit and withstand 500 pounds applied in any direction without deformation.
V. TURRET & TURRET BEARING
A. The turret shall be a one-piece weldment with reverse offset design.
B. The turret shall rotate on a ball bearing.
VI. ROTATION
A. Unit shall provide continuous turret rotation with no stops.
B. A hydraulic motor, driving the turret through a self-locking worm gearbox (no brake) shall accomplish rotation.
The gearbox is mounted on turret above rotation.
C. The rotation system shall be capable of rotating the maximum rated load capacity of the unit at the maximum attainable horizontal distance away from the pedestal upwards on a five degree incline.
VII. LEVELING
A. The platform shall be maintained in a level position relative to the chassis frame in all operating positions of the unit by a “closed” hydraulic system comprised of twin 2 1/2” platform cylinders interacting with a boom-actuated 4” master cylinder mounted in the boom support turret.
B. The leveling system shall be provided with factory-set relief valves to compensate for oil expansion or overload during platform leveling operation.
C. A leveling valve shall be provided in the boom control bank.
D. The leveling system shall be permanently connected to the boom valve bank and be capable of being remotely re-leveled with an electrical switch in the platform.
VIII. STABILITY
A. Completed unit shall be stability tested prior to delivery and shall be in conformance with ANSI A92.2.
IX. EMERGENCY LOWERING
A. Unit shall be provided with a twelve-volt emergency lowering system.
B. Switches shall be located at both the lower controls and upper controls.
X. HYDRAULIC SYSTEM
A. The hydraulic system shall be of open center design with 2,500-psi minimum design pressure.
B. The hydraulic pump shall be a gear type 14 GPM at 1,200 engine RPM.
C. The pump shall be of domestic manufacture.
D. The hydraulic pump shall be driven by a cable-shift PTO mounted to the transmission.
E. The PTO shall include an indicator/warning light.
F. The hydraulic pump shall be flange mounted to the PTO by means of an S.A.E. type flange mount.
G. The load bearing ends of all hydraulic cylinders shall be equipped with check or counter balance valves capable of hydraulically locking the cylinder and preventing movement of the cylinder in the event of loss of hydraulic power or line failure.
H. Hydraulic oil reservoir shall be properly labeled near the filler opening.
I. Hydraulic oil reservoir shall be mounted to the side of the sub frame below the bed with a capacity of 35 gallons.
J. Hydraulic oil reservoir filler opening shall be of such design as to prevent oil from splashing out of the reservoir.
K. Hydraulic oil reservoir filler shall be easily accessible and have a removable strainer.
L. Hydraulic oil reservoir shall have sight level gauge and thermometer mounted.
M. Hydraulic oil shall be supplied to the turret-mounted control valve through a rotary manifold.
N. All cylinders, control valves, hoses and hydraulic fittings shall be of domestic convention (no metric adapters permitted).
1. HOSES
a) All high-pressure hose to be wire braid reinforced with a minimum safety factor of 4:1.
2. CYLINDERS
a) All cylinders must have micro-honed I.D. cylinder tubing, chrome shafts, top grade packing and protective rod wipers.
3. FILTRATION
a) The hydraulic filtration system shall consist of the following:
(1) Suction strainer
(2) Return line filter, capable of providing 10 micron nominal filtration
(3) Pressure filter capable of providing 5 micron nominal filtration
XI. OUTRIGGERS
A. Unit shall be stabilized by four, hydraulically operated outrigger assemblies.
B. The main outriggers shall be Elliott “MH” type out-and-down design with an 18 foot spread. The vertical legs shall telescope under the bed floor.
C. Horizontal and vertical movement of the main outriggers shall be individually controlled.
D. The secondary outriggers shall be “A” type underslung with a 12 feet 6 inch spread.
E. Vertical outrigger cylinders shall be of the double acting type equipped with integral pilot operated check valves capable of preventing drift from both the retracted and the extended positions even in the event of loss of hydraulic power or line failure.
F. Main and secondary outrigger assemblies shall be solidly mounted to the sub-frame assembly.
G. Penetration of outrigger shoes shall not be less than six inches below normal ground level.
XII. OPERATOR CONTROL SYSTEM
A. The medium for transmitting control signals from the platform to the lower control station shall be by means of electric cable.
B. The aerial device controls located at the platform shall consist of three control handles for operating boom extension, lift and rotation. Actuation of these three functions shall be accomplished by means of proportional electric controls.
C. Controls shall meter pilot operated pressure compensated modulating valves.
D. Control handles shall incorporate safety collars for unlocking handles prior to movement.
E. The aerial device controls located at the platform shall include a remote chassis engine, start-stop system.
F. The lower boom controls shall have individual control valve handles to override each boom function.
G. The lower boom controls shall be mounted on the roadside of the turret above rotation.
H. The lower controls shall include engine speed and start/stop switches, along with upper/lower controls switch to override upper controls.
I. The outrigger-boom selector shall be mounted at the rear, under the bed.
J. The outrigger controls shall be mounted at the rear, under each corner of the bed with roadside valve controlling roadside outriggers and curbside valve controlling curbside outriggers.
K. The outrigger controls shall include a truck level bull’s eye.
XIII. BODY
A. The bed shall be 18 feet long with 3/16” steel tread plate floor w/ grip deck coating.
B. A standard DOT type bumper shall be installed at the rear of bed with taillights.
C. White anti-sail spray suppressant, splashguards shall be provided.
D. Step shall be provided on each side at the rear of the body to provide access to the walk-around control platform with non-slip steps and grab handles.
XIV. HEAVY-DUTY HYDRAULIC BOOM WINCH
A. Winch shall be a high-efficiency planetary type with integral load-holding brake.
B. The winch shall be rated for 5,000 lbs. bare drum.
C. The winch shall be controlled from an additional valve section on the lower control valve. It shall be pressure compensated to allow feathering the winch and one boom section simultaneously.
D. Winch shall be mounted at the base of the boom for a long fleet angle and flat, level spooling of cable.
E. The winch shall be supplied with 210 feet of 3/8” diameter 6x37 Improved Plow Steel Iron Wire Rope Core wire rope and a weighted swivel hook.
F. Unit shall be equipped with anti-2-block switch, weight and hydraulic valve to protect the unit from damage due to lifting the hook into the boom.
G. Three-ton top dead end snatch block shall be provided to operate with 2-part line.
H. One 50 lb. down haul ball required.
I. Required lifting rating 1,000 lbs. at 56-ft. radius, 5,900 lbs. at 2-ft. radius with platform removed.
J. Main boom section shall be equipped with a retainer at platform end to stow cable when not in use.
XV. MISCELLANEOUS
A. A 110-volt duplex receptacle shall be accessible to the operator in the platform for using electric tools.
XVI. CAB EQUIPMENT
A. The master control switch with indicator lights shall be installed in truck cab.
B. U/L approved 2-1/2 lbs., 5:BC dry chemical fire extinguisher shall be installed in the truck cab.
C. A holder for operator’s manuals shall be provided.
XVII. PLACARD/DECAL LABELS, MANUALS, VIDEO, ETC.
A. Each control and switch shall be clearly labeled to define function and direction of operation.
B. Two safety harnesses and 72” lanyards shall be delivered with the unit.
C. Two complete sets of operating, service, maintenance and parts manuals applicable to the aerial unit, as delivered, containing detailed parts and maintenance information inclusive of all optional equipment installed shall accompany the vehicle at the time of delivery.
D. One safety and operating video, covering safe use of the manufacturer’s products shall accompany the vehicle at the time of delivery.
XVIII. RECOMMENDED MINUMIM CHASSIS REQUIREMENTS
A. 33,000 lb. GVWR; 156” CA, 84” AF
B. Include hot shift PTO for automatic transmission and air shift PTO for manual transmission.
C. MoDOT chassis to be drop shipped to vendor.
| 70’ TRUCK MOUNTED AERIAL PLATFORM DEVICE, |
| “REAR” MOUNTED TURRET (wITH MoDOT Provided Cab/Chassis) |
| I. CONFIGURATION |
| B. PLATFORM |
| III. MOUNTING |
| IV. BOOM STORAGE |
| V. TURRET & TURRET BEARING |
| VI. ROTATION |
| VIII. STABILITY |
| IX. EMERGENCY LOWERING |
| X. HYDRAULIC SYSTEM |
| XI. OUTRIGGERS |
| XII. OPERATOR CONTROL SYSTEM |
| XIII. BODY |
| XIV. HEAVY-DUTY HYDRAULIC BOOM WINCH |
| XV. MISCELLANEOUS |
| A. A 110-volt duplex receptacle shall be accessible to the operator in the platform for using electric tools. |
| XVI. CAB EQUIPMENT |
| XVII. PLACARD/DECAL LABELS, MANUALS, VIDEO, ETC. |
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