SPECIAL SPECIFICATION 5170 Install Weigh-In-Motion (WIM) Equipment

Transcription

1 2004 Specifications CSJ SPECIAL SPECIFICATION 5170 Install Weigh-In-Motion (WIM) Equipment 1. Description. Install, commission, and calibrate State furnished Weigh-In-Motion equipment in a precast concrete pavement (hereafter WIM Installation ), such that the WIM Installation will pass the specified performance test and maintain equipment to perform at this level for 12 months. The Install Weigh-In-Motion Equipment item governs installation of the WIM weighpad frames and weighpads in the precast panels, installation of loop detectors in the pavement, provision and installation of all necessary ground boxes and conduit, calibration of the WIM system after installation and maintenance of the installed equipment to the specified performance level for 12 months following acceptance. 2. Materials. Provide all materials not supplied by the State necessary for the WIM Installation. Provide a task in the project schedule for delivery of State furnished materials and provide a minimum of 30 days notice to the Department for delivery of State furnished materials. Ensure that all materials and construction methods necessary to complete the installation conform to the plans and the following Items and Standard Sheets: Item 618, Conduit Item 620, Electrical Conductors Item 624, Ground Boxes Item 680, Installation of Highway Traffic Signals Item 684, Traffic Signal Cables Item 688, Pedestrian Detectors and Vehicle Loop Detectors State Furnished Materials. The State will furnish the following Weigh-In-Motion equipment and materials to the Contractor: 8 each weighpad frames, including shims, support and securing rails, anchors, spring washers, and lock nuts 8 each weighpads with 105 ft. of cable 1 each controller, DAW 190, including power terminal panel, with loop detector sensor units. 1 each on-site modem Epoxy (For installation of weigh pads only) Vehicle Loop Wire

2 Upon receipt of these materials from the State, certify that they are in proper working condition and sign off on delivery of the materials. 3. Equipment. Provide all equipment, including but not limited to: boring equipment; concrete wet saws; two class 9 vehicles and one class 5 vehicle in new or like new condition and loaded to the limits specified, with air suspension; and other equipment necessary to install a fully functional weigh-in-motion system in accordance with the Plans and Specifications provided. Provide boring equipment equipped with guidance and location devices. 4. Construction. A. Conduit. Install conduit in the types and sizes shown on the plans and specified in these Special Specifications. Install conductors and seal the ends of conduits terminating in ground boxes and in the controller enclosure with an approved type of sealing compound. Install conduit shown on the WIM SYSTEM INSTALLATION LAYOUT plan sheet as 4 C Directional Bore by the horizontal directional drilling method. A Soil Investigation is not required. Use flexible high-density polyethylene (HDPE) electrical or communications conduit conforming to the requirements of ASTM F 2160 or as approved for use by the Engineer. Provide a minimum depth of cover at any point between ground boxes of 24 in. Monitor boring by manual plotting based on location and depth readings provided by the location/tracking system or by computer generated bore logs. Collect readings or plot points on every drill rod. Furnish the Engineer with a copy of the bore log showing horizontal and vertical (depth) alignment of the conduit. If monitoring of the equipment s guidance and location devices require interruption in traffic flow, provide traffic control at no additional cost in accordance with Standard Plan Sheet WZ(TD)-03. B. Ground Boxes. Install ground boxes as shown on the WIM System Installation Layout Plan Sheet and the WIM System Electrical Layout and Ground Box Connection Plan Sheet in accordance with the ED(3)-03 Standard Sheet, Electrical Details-Ground Boxes for a Type D or Type E ground box, with reinforced concrete apron and gravel fill, unless otherwise approved. C. Detectors. Install loop wire consisting of a conductor inside of plastic tubing in accordance with Section B and as shown on plans. Install conductors for loop detector lead-in cable (DLC) consisting of two No. 16 (19 x 29) stranded tinned copper. Ensure loop detector lead-in cable conforms to the calculated cross sectional area of ASTM Designation B 286, Table 1. Use lead-in cable that is insulated with 20 mils of high-density polyethylene. Ensure that the conductors are twisted together with at least 2 turns per foot and the twisted pair is protected with a copper or aluminum polyester shield. Provide a No. 20, minimum, copper drain wire connected to the equipment ground within the cabinet. Ensure that the cable provided has a high-density polyethylene or high-density polypropylene outer jacket with a nominal thickness of 32 mils. Provide an amorphous interior moisture penetration barrier of nonhydroscopic polyethylene or polypropylene fillers

3 Cut slots for inductive detector loops only after the concrete pavement has been ground, straightedged, and brought into tolerance as provided in these Special Specifications and prior to removal of the temporary WIM blockout patch from the scale pit. Cut slots for loops no deeper than 3-in., but deep enough to provide a minimum of 1 in. depth of sealant over the wire and wide enough such that the loop wire wraps will fit loosely in the slot. Wash clean, blow out and thoroughly dry slots cut in the pavement before installing conductors. Install 5 turns of wire for each loop. Twist each wire pair from the loop to the shoulder termination ground box a minimum of 5 turns per foot. After conductors are installed in the slots cut in the pavement, fill the slots with elastomeric sealant to within 1/8-in. of the pavement surface in a manner such that the loop wire is encapsulated with the sealant to the bottom of the slot, with a minimum sealant thickness of 1 in. above the top conductor in the saw cut. Remove all surplus sealant from the adjacent road surfaces without the use of solvents before the sealant sets. Install loop conductors without splices, terminating in the nearest ground box. Seal the open end of cable jackets or tubing in a manner similar to the splicing requirements to prevent the entrance of water. D. WIM Scale Pit Preparation. Use the scale pits and the 1-1/4 in. diameter holes for the frames anchors that are preformed in the precast concrete pavement panel in which WIM scales are to be installed, as shown on the plans. Provide equipment and materials at the site to perform additional chipping, grinding, cleaning of the preformed scale pit, and reaming of the anchor holes for the frames anchors as required to prepare the pit for scale installation. E. WIM Frame and Weighpad Installation. Install frames and weighpads in accordance with the WIM equipment manufacturer s current Installation Instructions for Stationary Weighpad and 69 /1.75M Frame, which is available from the manufacturer. Furnish scale lead-in extension cable, conforming to the WIM equipment manufacturer s requirements. Install each WIM frame in its designated location, as determined by the frame used as a template for the anchor holes during precast panel fabrication. Bond #4 bare ground wire to rigid metal conduit from WIM frames to ground box. F. WIM Conductors and Splicing Identification. Splice loop wires to the DLCs and scale lead-in cable to scale lead extension cable as recommended by the WIM vendor. Identify each loop wire pair, DLC, and scale lead-in or extension cable according to loop number or weighpad number (1 through 8) in each ground box and in the controller enclosure with pre-numbered plastic identification tags or tape G. WIM Equipment Manufacturer Support. Provide a representative of the WIM equipment manufacturer on-site during scale pit preparation, installation of the frame and weighpads, and installation of the WIM controller. Allow manufacturer s representative to perform or oversee performance of all loop wire/dlc splices and all scale lead cable/scale lead extension splices. H. WIM System Commissioning and Calibration. Provide a representative from the WIM equipment manufacturer to commission the WIM equipment and install the manufacturer s recommended version of software

4 JRD Corporate Office IRD (International Road Dynamics, Inc.) rd Street East Saskatoon, SK, Canada S7K 3T9 Phone: Fax: Calibrate the system in conformance with the provisions of ASTM E , Section 7.5, with the following exceptions: Calibration adjustments to be performed by the WIM manufacturer s representative Use two Class 9 and one Class 5 (2-D) air suspension vehicles for the test units. Furnish the test vehicles loaded to the specified limits and their drivers at the site for the day of the performance test, fully fueled, a measure of the vehicle axle spacing to the nearest 0.1 ft. and with a current day certified public scale weight ticket that has a record of each axle or axle group and gross vehicle weight. Provide the first Class 9 vehicle with a tractor driver and trailer air suspension tandems, loaded to a gross weight of between 75,000 and 80,000 lb. Provide the second Class 9 vehicle with tractor driver air suspension tandem. Provide the second vehicle s trailer with either an air suspension tandem or a spread tandem with each axle having air suspension. Load the second vehicle to a gross weight of between 50,000 and 60,000 lb. Load the Class 5 vehicle to 90% of its registered weight. Provide vehicles that comply with all provisions of 7.5.3, except as noted in these Special Specifications. The provisions under for statically weighing the test vehicles a minimum of 3 times are not required Not applicable The use of a radar speed meter is not required. The comparison between measured axle spacings of the test trucks and their WIM generated axle spacings may be used to determine speed calibration Conduct tests at the maximum specified speed determined by the Engineer. Conduct the number of runs and speeds of initial series of runs by all test vehicles as dictated by WIM equipment manufacturer s representative to best determine the initial settings of the WIM controller software s wheel load and speed correction factors. Following initial setting of correction factors, conduct a minimum of 2 valid runs by each test truck for every 5 mph increment between and including the minimum and maximum speed range established by the Engineer. Instruct the test truck drivers to make every run centered in the designated lane. In addition to recording all data, plot each run on a graph displaying speed as the x- axis and percent gross weight error as the y-axis. Use different plotting symbols for each of the 2 test trucks

5 The WIM manufacturer s representative and the Engineer will decide on whether adjustments to the controller software s wheel load and speed correction factors will be based upon mean values for the test truck data sets and graphical plots or by some other method if it is deemed that either of the test truck s data contains anomalies that should not be used. For any wheel load correction factor adjustment exceeding 5%, provide 2 additional runs by all test trucks at the speed or speeds necessary to confirm that the correction factor adjustment effected a linear adjustment in the test vehicles recordings of wheel loads. This process must be repeated until it can be demonstrated that the WIM Installation meets or exceeds the ASTM E 1318 Type II performance requirements for WIM Installation to be accepted. Provide the Engineer with copies of all test vehicle data, graphs, and controller software s correction factor settings and adjustments compiled by the representative during the calibration process from the WIM manufacturer s representative. I. WIM Scale Pit Conduits and Drains. Extend the 2-in. rigid metal conduit (RMCs) into shoulder termination ground boxes from the 2-in. RMCs embedded in the precast panels, as shown on plans. Fit each drain outlet with a wire screen or mesh material tightly over the open end of the RMC and secure in place with a hose clamp or other securing device. Slit the outlet cover screening material to permit passage of conductors through the screen. Use duct seal compound or other sealing material approved by the Engineer to fill any openings around the conductors passing through the drain outlet screen such that it will prevent entry by rodents without preventing drainage of water from the RMC. J. Maintenance. Provide 12 months of maintenance and repair. The 12 month period begins upon written acceptance of the WIM installation and calibration. When notified of the need for maintenance or repair, complete work within 48 hours. Supply all materials. The work will be found to be unacceptable if the required repairs are not completed on time or if re-repairs are required for the same malfunction. 5. Measurement. This Item will be measured by the lump sum. 6. Payment. The work performed and the materials furnished in accordance with this Item and measured as provided under Measurement will be paid for at the unit price bid for Install Weigh-In-Motion Equipment. This price is full compensation for furnishing all equipment, materials, labor, tools, incidentals, and for providing 12 months of maintenance and repair. A. Initial Payment. When the installation and calibration of the related equipment is completed and approved, 55% of the unit price bid will be paid. B. 30-Day Payment. When the first 30 days of the 12 month specified performance period is completed and approved, an additional 15% of the total price will be paid, bit if the performance is not approved, that 15% will be forfeited. C. 90-Day Payment. When the first 90 days of the 12 month specified performance period is completed and approved, an additional 15% of the total price will be paid, but if the performance is not approved, that15% will be forfeited

6 D. Final Payment. When the final 12 months of the 12 month specified performance period is completed and approved, and after the final inspection and acceptance, an additional 15% of the total price will be paid, but if the performance is not approved, that 15% will be forfeited. Furnish to the Engineer a cost breakdown for the contract lump sum item for the WIM installation within 30 days of commencement of construction. Determine the quantities of the items required to complete all work shown on the plans. Include such quantities and their values (including labor, equipment and materials) in the cost breakdown submitted to the Engineer for approval. The sum of the quantity units times the unit prices equals the contract lump-sum bid for the WIM Installation. The Contractor is responsible for the accuracy of the quantities and values used in the cost break-down submitted for approval. Unbalancing of the unit prices will not be allowed. Include overhead, profit, bond premium, temporary construction facilities and other such items in each individual unit listed in the cost breakdown. No adjustment of compensation will be made in the contract lump sum prices paid for the WIM Installation due to any differences between the quantities shown in the cost breakdown furnished by the Contractor and the quantities required to complete the work as shown on the plans and as specified in these Special Specifications. The approved cost breakdown by the Engineer will be used to determine partial payments during the progress of the work and as the basis of calculating the adjustment of compensation for the WIM Installation due to changes ordered by the Engineer. When a change order increases or decreases the quantities of an approved cost breakdown, the adjustment in compensation will be determined in the same manner specified for increases and decreases in the quantity of a contract item of work in accordance with Item 4, Section 4.2. As a minimum, include the following items in the cost breakdown: Conduit (listed by each size, type, and installation method). Ground boxes (each type). Conductors (each size and type). Loop Detectors (list by type and size). WIM equipment manufacturer s tech support and furnished materials Miscellaneous labor, equipment and materials necessary for installing the State Furnished Materials, including but not limited to scale pit preparation, frame installation, and weighpad installation. The costs of preparing the cost breakdown will be considered as included in the lump sum price for the WIM Installation and no separate payment will be made therefore