ADVANCING FORMWORK

THE ARTICLE DESCRIBES A SYSTEM OF ADVANCING GIRDERS AND FORMWORK DEVELOPED IN EUROPE FOR MULTI-SPAN BRIDGE CONSTRUCTION. THE SYSTEM IS SUITABLE WHERE INTERMEDIATE SPANS AND CROSS-SECTION PROFILE ARE CONSTANT. GROUPS OF HEAVY-DUTY STEEL GIRDERS BRACED TOGETHER SUPPORT ONE SPAN, ONE END, CONTROLLED BY HYDRAULIC JACKS, BEING SUSPENDED FROM THE UNDERSIDE OF THE PREVIOUS SPAN, AND THE FORWARD END CANTILEVERED QUARTER SPAN PAST THE NEXT SUPPORT COLUMN. THE POSITIONING OF HYDRAULIC JACKS, ROLLERS AND MACHINE SKATES AT THE SUPPORTS IS DESCRIBED. CLOSE JOINTED BOARDING IS SUITABLE FOR FORMWORK AND CAN BE HINGED TO ALLOW CLEARANCE AT THE SUPPORT COLUMNS WHEN GIRDER GROUPS ARE REPOSITIONED. CONCRETE IS PLACED IN ONE CONTINUOUS POUR TO FULL WEIGHT, STARTING AT THE LEADING CANTILEVER NOSE. VARYING AMOUNTS OF RETARDER ARE INCORPORATED INTO THE MIX TO ALLOW THE GIRDERS TO CHANGE SHAPE DURING POURING AND TO INSURE UNIFORM INITIAL SET. STRESSING IS APPLIED AS SOON AS THE CONCRETE STRENGTH PERMITS. AFTER JACKING DOWN ONTO THE ROLLERS AND MOVING SIDEWAYS FOR CLEARANCE, THE GIRDERS AND FORMWORK ARE WINCHED FORWARDS AND REPOSITIONED FOR THE NEXT SPAN. THE CONSTRUCTION OF THE ROMBERGSHOLZ VIADUCT IS DESCRIBED TO ILLUSTRATE THE USE OF THE SYSTEM.

  • Availability:
  • Corporate Authors:

    Morgan-Grampian (Professional Press) Limited

    Morgan-Grampian House, Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Turner, C F
    • Knight, J F
  • Publication Date: 1974-4

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Filing Info

  • Accession Number: 00080570
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 26 1975 12:00AM