BRIDGE WITH STEEP GRADES HAS HEATED PAVEMENT

ENGINEERS WHO DESIGNED THE EISENHOWER BRIDGE IN ANDERSON, INDIANA, HAD NO CHOICE BUT TO INCLUDE GRADES OF 6.6 PERCENT, DUE TO LOCATION OF THE STRUCTURE AND THE TERRAIN AT EITHER END. BECAUSE OF THE UNUSUALLY STEEP GRADES, STEPS WERE TAKEN TO PREVENT ACCUMULATION OF SNOW AND ICE. THE SOLUTION WAS TO INSTALL APPROXIMATELY 21 1/2 MILES OF ELECTRIC HEATING CABLE AUTOMATICALLY CONTROLLED TO MAINTAIN THE PAVEMENT SURFACE AT 34F WHENEVER SNOW, ICE OR FREEZING RAIN WERE PRESENT. TWO SNOW AND ICE DETECTORS TURN THE SYSTEM ON WHEN NECESSARY. EACH DETECTOR HAS TWO PROBES - ONE HEATED AND ONE COLD. SNOW FALLING ON THE HEATED PROBE MELTS TO PRODUCE MOISTURE WHICH SERVES AS A CONDUCTOR BETWEEN TWO ELEMENTS OF THE SWITCHING CIRCUIT, ACTIVATING THE SYSTEM. THE UNHEATED PROBE SENSES MOISTURE ONLY WHEN IT IS WARMED BY THE PAVEMENT SURFACE TEMPERATURE. THUS, IT KEEPS THE SYSTEM OPERATIVE UNTIL THE PAVEMENT IS CLEAR AND DRY. /AUTHOR/

  • Availability:
  • Supplemental Notes:
    • Vol 102, No 6, P 104
  • Publication Date: 1971-6

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Filing Info

  • Accession Number: 00209491
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 1971 12:00AM