690Static Scale System

690.1General Description

This work includes furnishing and installing components for three-axle load static scale weighing systems according to the plans and specifications. Install the scales in truck weighing stations. 690.1.01 Definitions General Provisions 101 through 150. 690.1.02 Related References

National Institute of Standards and Technology Handbook 44 690.1.03 Submittals

After the Contract is awarded, submit the following to the Engineer for approval: • Complete materials list • Complete Shop Drawings • List of equipment with supporting data that will be incorporated into the work Identify each Item on the material and equipment list with an applicable section and subsection from the specifications. Allow the Department 60 days for review of materials, equipment, shop drawings and other manufacturer’s data.

Along with the materials and equipment list, submit manufacturer’s catalogs, cuts, diagrams, performance curves, charts, and other data demonstrating that equipment adheres to the specifications and plans. Model numbers alone are not acceptable.

Submit manufacturer’s guarantees on materials and equipment, as well as manufacturer’s instruction manuals. The Engineer will transmit these to the Department for future operation and maintenance of the truck scale system. Ensure that guarantees are subject to transfer.

Before beginning work, furnish a written warranty for the static scale system according to Subsection 690.3.07. 1308 1308 1308 1308 1308

When materials and equipment are designated in the plans or specifications by “brand names or equal,” the equal materials may be used with the Engineer’s approval. Submit the name and complete description of the equal material or equipment in writing. Also submit supporting data for equipment performance according to Subsection 690.1.03 above.

690.2Materials

Ensure that materials and equipment conform to the electronic axle load scale plans and these specifications. The Contractor’s attention is directed to Subsection 105.04.A, Specifications of Other Organizations. Furnish new materials and equipment subject to the Engineer’s approval.

Use the following standard package components and accessories for permanent scale installation according to the plans and this section: • Three electronic weighing platforms • Three weight indicating and recording elements with one totalizer • Reinforced concrete scale pits and approach aprons • Traffic signal lights and controls • Conduit and cable with electrical installation for axle scales and traffic signal lights

Install each of the 3 weighing platforms in a common pit capable of simultaneously weighing 3 tandem axles that vary from 40 in. to 54 in. (1 m to 1.4 m) center-to-center. Install each weighing platform with the following capacities: • At least 40,000 lb. (18 000 kg) capacity • Capacity to weigh an axle unit up to 12 ft. (3.7 m) wide in one operation • One-axle maximum capacity • Capability to withstand 100 percent transit side load

Install each weighing platform with electronic load cells with the following capabilities: • At least 20,000 lb. (9000 kg) capacity • At least 200 percent overload rating • One-time static overload capacity of at least 300 percent of normal without structural failure Environmentally seal each cell against moisture and corrosion under normal pit conditions. (See Subsection 690.3.05.A, Reinforced Concrete Scale Pit Construction.)

Ensure that each weighing platform’s axle load scale has a 0.1 percent test load acceptance tolerance according to the National Institute of Standards and Technology Handbook 44.

Equip each weighing platform’s axle weigh bridge with appropriate check devices designed to prevent the reinforced concrete platform from moving horizontally.

Use easily replaced and repaired plug-in weight indicators, printers, interfacing, and memory storage units. Power the weight indicating and recording elements using a 115-volt AC, 60 hertz, single phase electricity. Furnish one spare weight indicator and one spare electronic printer in case of electronic equipment interruptions. 1309 1309 1309 1309 1309

Provide each weighing platform with an individually housed digital indicator with these features: • Weight indicating capability of maximum 20 lb. (10 kg) increments • Measuring capability of up to 99,980 lbs. (45 350 kg) • Five-digit illuminated displays using at least ½ in. (13 mm) high digits • Easily replaced snap-in snap-out type printed circuit boards for the indicator electronics • Push-button zero that can eventually take an additional outside digital indicator for driver viewing

Provide an individually housed dot-matrix programmable printer-totalizer capable of printing letters and numbers on paper tape with the following format: Georgia Department of Transportation _______________ County Weigh Station _______________ Bound Lane _______________ (Date/Time) (The following chart is a format example only.) Axle 1 11,980 lbs. (5434 kg) Axle 2 17,860 lbs. (8101 kg) Axle 3 18,200 lbs. (8255 kg) Axle 4 19,720 lbs. (8945 kg) Axle 5 18,800 lbs. (8528 kg) Axle 6 18,500 lbs. (8391 kg) Gross 105,060 lbs. (47 654 kg)

• Print control switches on each individual weighing platform • Totalizer memory bank status indicators capable of 0.1 percent accuracy for each of the 3-axle load scales • Twenty-four-hour clocks

See Subsection 690.3.05.A, Reinforced Concrete Scale Pit Construction.

Use three traffic signals, equipped as follows: • Two 8 in. (203 mm) diameter lenses • Two 150-watt signal bulbs • Visors over each lens

Furnish and install according to the National Electrical Code conduit, cable and pull boxes, junction boxes, shielding, grounding, surge voltage lightning protection between the weight indicating and recording element and the scale, the weight platforms, pit light, receptacle, and appurtenances. See Subsection 690.3.05.D for installation. 1310 1310 1310 1310 1310

690.2.01 Delivery, Storage, and Handling Do not use the interstate Right-of-Way outside the truck weighing station to store equipment or supplies.

690.3Construction Requirements

690.3.01 Personnel

During the Acceptance Performance Test (APT) period following installation, train at least 10 Department- designated people to operate and maintain the truck weighing station systems. Furnish two operations and maintenance manual(s) for each set of platforms.

traffic signal.

of malfunctions.

Provide a trained static scale system specialist to assist in system operation for approximately one week during the APT. 690.3.02 Equipment General Provisions 101 through 150. 690.3.03 Preparation Truck weighing station construction may already be in progress. Coordinate operations with utility companies and other Contractors to complete the work quickly. 690.3.04 Fabrication General Provisions 101 through 150. 690.3.05 Construction Maintain limit of access to the truck weighing station. Enter and exit the station by ramps only.

Furnish the reinforced concrete scale pits complete, including the structural design. Ensure the structural design supports the maximum compression load cell overload capacity without structural failure (see Subsection 690.2.B).

Install scale pit concrete including sleeves, piping, conduits, anchors, frames, other Items to be built-in, and other required Work and appurtenances. Do concrete Work according to Section 500 and Section 511. Use deformed billet steel bars for bar reinforcement steel according to Subsection 853.2.

Construct scale pits and aprons at locations designated on the plans and as follows:

point below and near the center of the scale pit unless otherwise noted on the plans.

warning light within the operator’s tower when water in the scale pit reaches 6 in. (150 mm) deep. 1311 1311 1311 1311 1311

volume control.

equipment inspection and maintenance.

Install and wire three red (stop)–green (go) traffic signal lights and controls as indicated on the plans. and as follows:

(red-off-green) toggle switch located on the counter in the operations tower.

operations tower.

Place span and calibration adjustments for the entire weighing system inside the weighing station building at the indicators. Install the adjustments so that replacing the circuit board does not require recalibration of the scales.

Install cable connections in conduit between the elements and the platform scales. Follow these requirements for cable and installation: • Conform to Section XV of the Scale Manufacturer’s Association’s Specification Recommendations. • Use armored flexible cable between scale pits and load cells. • Use Schedule 40 PVC for the buried conduit between the scale pits and the operations building. • Environmentally seal the load cell and underground connector cable connections. 690.3.06 Quality Acceptance Time is of the essence in this Contract. Complete installation and testing on or before the project completion date and be ready for the Department’s acceptance performance test. Test with weights certified and calibrated according to Georgia Department of Agriculture standards. Measure the acceptance tolerance of the weighing system according to Subsection 690.2.B.

The APT shall demonstrate to the Department’s satisfaction that the static scale system consistently meets the performance requirements of the plans and specifications. At the conclusion of a successful APT, apply 0.2 percent maintenance tolerance to the scales and equipment until they are recalibrated.

Submit a test plan to the Department for approval within 30 days after the Notice to Proceed.

Begin the APT on the first normal working day following completion, calibration, and testing of the installation.

During the APT period, the Department will operate the static scale system for approximately 8 hours per day,

5 days per week for 8 consecutive weeks.

Provide a trained static scale system specialist to assist in the operation for approximately 1 week.

The Contractor’s attention is directed to Subsection 108.08, Failure or Delay in Completing Work on Time.

Liquidated damages will start on the day after the project completion date if the installation is not complete

and ready for the APT.

Deductions for liquidated damages for each day of overrun in contract time will stop when the APT begins. 13121312131213121312

690.3.07 Contractor Warranty and Maintenance

Before beginning construction, warrant the static scale system equipment in writing against defective material

and workmanship.

Furnish the written warranty to the Department when submitting Shop Drawings for approval. Include the provision

that warranties are subject to transfer to the Department.

Warrant that for 6 months from the beginning date of the APT that equipment will perform according to Subsection

690.2.B and Subsection 690.2.C, continuously serving as intended under conditions required for the equipment.

The written warranty must be accepted and approved by the Department before beginning installation of the static

scale system.

The warranty excludes damage caused by fire, flooding, lightning, accidents, vandalism, or natural disasters.

Write the warranty to cover materials, equipment, service, labor, travel, and incidentals necessary for warranty

service at no additional cost to the Department.

Provide warranty service including the following:

by the Chief of Permits and Enforcement or a duly authorized representative. Make a maximum of 10 calls

during the warranty period without additional charge to the Department.

Perform requested warranty service either the same day or on the first working day following the request.

690.4Measurement

This work will not be measured separately for payment.

690.4.01 Limits

General Provisions 101 through 150.

690.5Payment

Electronic axle load truck static scale system will be paid for at the Contract Lump Sum Price. Payment is full

compensation for materials, equipment, labor, tools, direction, and incidentals necessary to complete the Item

according to the specifications and plans. Payment includes the spare weight indicator and standby printer, calibration

and testing, a 6-month warranty, and Department personnel training.

Partial payments will be made on the basis of the following schedule of payments expressed as a percentage of the

Contract Lump Sum Price:

Scale pit construction 20%

Furnishing, installing, and calibrating the scales, weight indicator/recording element, and

totalizer/printer

70%

End of 90-day acceptance performance testing as described under Subsection 690.3.06 10%

Payment will be made under:

Item No. 690 Electronic axle load truck static scale system truck weighing station_____ Per lump sum

690.5.01 Adjustments

General Provisions 101 through 150.. 1313 1313 1313 1313 1313