INVESTIGATION AND TESTING EQUIPMENT OF THE FRENCH HIGHWAY AUTHORITIES FOR EVALUATING ROADS

DIE UNTERSUCHUNGS- UND PRUEFGERAETE DER FRANZOESISCHEN STRASSENVERWALTUNG ZUR BEURTEILUNG DER STRASSEN

THE FOLLOWING EQUIPMENT FOR THE MEASUREMENT OF THE MECHANICAL CONDITION OF THE PAVEMENT, OF DRIVING COMFORT AND OF SAFETY IN TERMS OF THE BEARING CAPACITY AND THE THICKNESS OF A ROAD HAS BEEN DEVELOPED BY THE FRENCH HIGHWAY AUTHORITY: FOR THE MEASUREMENT OF VERTICAL DEFORMATION OF A CARRIAGEWAY UNDER A REAR AXLE LOAD OF UP TO 13 T A LACROIX-LPC-DEFLECTOGRAPH HAS BEEN FITTED TO A LORRY. TO STUDY THE CONDITION OF THE RIDING SURFACE OF A ROAD A 35 MM CAMERA WITH CONTINUOUS FILMING FACILITY HAS BEEN MOUNTED ON THE ROOF OF A VEHICLE ACCORDING TO THE GERPHO-SYSTEM. A FURTHER DEVELOPMENT IS THE USE OF A CAMERA WITH THE CAMEROUTE-INSTRUMENT WITH WHICH IT IS POSSIBLE TO RECORD ROAD WIDTHS, VISIBILITY DISTANCE, OBSTACLES AND ACCESS CONDITIONS. MEASUREMENT OF THE LONGITUDINAL AND TRANSVERSE GRADIENTS MAY BE MADE BY THE GYROS-VEHICLE, WHICH IS EQUIPPED WITH A GYROSCOPE. THE EVENNESS OF A ROAD IS MEASURED BY THE APL-LONGITUDINAL PROFILE ANALYSER. THE DAILY PERFORMANCE AMOUNTS TO 200 KM. TO MEASURE SKID RESISTANCE THE LPC-FRICTION EQUIPMENT IS USED WORKING ON THE BLOCKED WHEEL PRINCIPLE. RADIATION MEASUREMENT INSTRUMENTS HAVE BEEN DEVELOPED FOR THE MEASUREMENT OF DENSITY BELOW THE WEARING SURFACE. WITH A NEUTRON PROBE THE DEPTH OF WATER FILMS MAY BE MEASURED. THE DYNAPLAQUE INSTRUMENT PROVIDES INFORMATION ON THE BEARING CAPACITY OF THE SOIL.

Language

  • German

Media Info

  • Pagination: 131-6
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01303598
  • Record Type: Publication
  • Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
  • Files: ITRD
  • Created Date: Nov 21 2010 9:07AM