System Installation

General Principles

ASTM-E1318 requires that the WIM equipment be installed and maintained in accordance with the recommendations of the system vendors. Some general principles are: Installation must be done in good weather, not wet, freezing, or hot conditions. The sensors must be flush with the road surface, no more than 1 mm separating the top of the sensor from the road surface.…
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Culway Installation

The design of the culvert for Culway should meet the following requirements: The culvert should be as perpendicular to the road centreline as possible (with a skew tolerance of less than 5 degrees). The culvert should be a single span reinforced concrete box culvert, precast, 'uncracked' with a desirable span of 1 800 mm to 2 400 mm. Spans that…
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Bending Plate Installation

The bending plates are installed in foundation frames flush with the pavement surface. Recesses for the frames are 50 mm deep in the bearing area and about 100 mm in the centre for cables and drain. One weighing threshold with three small plates is 3775 mm wide and two large plates are 3525 mm wide. Both measure 650 mm in…
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Capacitance WIM Installation

The capacitance pad weigh sensors and loops are to be installed only after the final pavement has been provided or is available. This ensures that the mounting frames will be perfectly flush with the road surface. This is extremely difficult to achieve if the frames are pre-installed. For example, the Mikros Systems capacitance sensor is secured to a special flat…
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Piezoelectric WIM Installation

The piezoelectric sensors should be tested prior to and after installation. Because of the high costs of installation compared to the cost of the sensor, it is imperative that the sensors be checked out prior to putting them into the road to determine if any damage has been done to the sensor during shipping and handling. Installation Procedures The general…
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