SPECS (CRANE 240).doc.pdf

SPECIFICATION INFORMATION

1. General Provisions:

It is the intent and purpose of this specification to describe a truck mounted self-contained hydraulic crane to use for bridge inspection and maintenance.

The equipment shall comply, in all respects, with OSHA standards (aerial lifts) 1926.556 and 1910.67 (vehicle mounted elevating and rotating platforms) as well as standards referenced therein and ANSI A.92.8 statutes as applicable.

Pre-delivery criteria must include testing on a combination of 5% grade and 8% super elevation with 1-1/2 times the rated load in all configurations.

Service and parts must be available within 48 hours in the limits of the continental United States

2. Coverage:

Under bridge coverage area, without moving the truck, is to be a minimum of 10,000 square feet. Driving the truck forward or reverse, with booms extended in working position, shall provide additional overlapping areas of coverage. Minimum horizontal extension from outer edge of bridge deck, under and across, shall be 51’ 6”. Minimum horizontal extension from centerline of second turret shall be 55ft. With no changeover before or after under bridge use, overhead capabilities will allow positioning of baskets 45 ft. above grade with second boom above ground level.

3. Main Frame:

The main frame or pedestal and turret shall be constructed of high strength steel and equipped with a counterweight. The counterweight is not to exceed the width of the truck when the crane is in stowed or operating positions. The main turret shall rotate about the centerline of the vehicle 360 degrees, thus allowing operation from either sides of truck.

4. Stabilizers:

To increase safety and stability, plus decreasing vehicle curb weight, the main frame shall be supported with two (2) “A” type stabilizer assemblies, located on each side of the frame.

Both shall be independently hydraulically operated and each shall roll with truck movement on two- (2) 16” diameter a 4” wide steel wheels with polyurethane tires. They are to be electrically interlocked so that the crane will not operate unless the stabilizer on the side the crane is being deployed is properly engaged. Only one stabilizer will be required during positioning and under bridge use. The total operating width of the unit with one stabilizer extended is approximately 10'0”.

5. Spring Lockouts:

Both rear and front hydraulic spring lockouts or lock blocks will be provided to stabilize and reduce “spring” action of truck during crane operation. These are to electrically interlocked to prevent crane operation if not engaged.

6. First Boom:

The first section shall be non-telescoping with a nominal 19' horizontal reach. It shall rotate hydraulically at least 360 degrees at the main turret, allowing operation from both sides of the truck. Tilt above horizontal shall be 40 degrees, -below- 20 degrees - which will allow placement of booms over fences a minimum of ten feet (10'), in height. at the outboard end, the boom is to be equipped with a hydraulically operated second turret, which can be rotated a minimum of 270 degrees, enabling second and basket boom to be placed laterally along the side of the bridge deck, as well as rotating underneath.

7. Second Boom:

The second boom section shall hydraulically telescope from 18' to 29' extending downward, enabling the basket boom to be positioned horizontally under girders 25' below a bridge deck. It shall articulate through 103 degrees, allowing the boom to fold into a stowed position on the truck and open to a near vertical position when the SNOOPER is in operation. The second boom is to be constructed of steel, opens 15 degrees beyond vertical when the crane is in operation.

8. Third Boom:

The third boom section shall telescope a nominal 20' to 32' pin to pin. It shall hydraulically articulate from a stowed position 107 degrees.

9. Fourth Boom:

The fourth or basket boom telescopes from 7' to 9'6" and shall be pin mounted to the outboard end of the third boom. Hydraulic articulation shall be a minimum of 128 degrees.

A metal basket 60" long X 36" wide X 42" deep, with a minimum capacity of 600 lbs. is to be mounted at the boom tip. The basket shall be hydraulically self-leveling through the full range of travel. Tilting the boom upward from horizontal through 90 degrees will position the basket on the backside of girders, with the top of the basket 9'9" above the third boom.

Scoping and articulation of booms will enable horizontal extension from outer edge of bridge beck under and across up to 51’ 6"; from centerline of second turret 55’. With booms tilted downward, the vertical reach shall be approximately 52’-8” below a bridge deck. Overhead capabilities will allow positioning basket 45' above grade with second boom above ground level.

2/16 REVB -3-

10. Safety Systems:

The unit shall be equipped with an integral boom limiting/safety system. The system shall include a programmable logic controller with outboard devices, which prevent boom movement beyond a safe prescribed operating range. The safety system shall be electrically interlocked to the spring lockout assemblies and rolling stabilizers and will not allow normal operation of the crane unless spring lockouts are engaged and the appropriate rolling stabilizer is deployed.

11. Remote Controls:

Dead man type, one set located at main frame and one set located at the workstation.

Engine start-stop shall be provided to shut down or start operation in emergency. One control lever is to be provided for each function. It shall be possible to operate one or more functions at the same time, controlling the unit at various speeds from creep to full.

Central station at main frame shall override workstation in case of emergency.

12. Communication System:

A three-station, 12 volt intercommunication circuit providing the following: Both listen and transmit from truck cab and main control station at main frame to underbridge work station. Press switch to transmit. Continuous open system at work station allowing workers under bridge to talk or listen without operating any switches.

2/16 REVB -4-

13. Hydraulics:

Hydraulic system shall be sufficient to properly operate the unit with greatest safety. All valves, pumps, filters, hoses, fittings, and P.T.O. shall be furnished. All hydraulics to meet J.I.C. standards.

RESERVOIR - 23 gallon surge baffled.

FILTERs - 10 micron, return line type.

20 micron pressure line filter

PUMP - Minimum 15 gallon at 1,800 R.P.M., piston pressure compensated type with 100 mesh suction line strainer.

SYSTEM PRESSURE - Adjustable, preset at 2,350 and protected by relief valve.

CONTROL VALVES - Valves shall be of a type that allow precise metering from creep to full speed from a remote controller. Valves shall be pressure compensated to provide constant speed regardless of load pressure changes. They shall also allow the operation of two or more controls in any combination. Valves shall have a lever for manual override operation in the event of electrical failure.

HYDRAULIC LINES - Seamless steel tubing and extra heavy piping, forged or machined steel fittings.

Heavy duty pressure line hoses 2,500 P. S. I. minimum working pressure.

CYLINDERS - All cylinders shall be double acting and have automatic safety check valves directly mounted to the cylinders. Cylinder walls to be honed, cylinder rods to be ground and polished, chrome plated alloy steel.

BACK-UP HYDRAULIC PUMP – The unit shall be equipped with an emergency back-up hydraulic pump system. The pump shall be driven by a 12v dc electric motor which is activated by an electric switch located in the truck cab. This system is to be used in the event of truck engine, P.T.O., or truck mounted pump failures and shall have the capability to stow the unit from any operating position.