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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

CURBING THE CRITICISMS

This article describes the slipforming method of kerb laying using a variformer machine. C40 grade ready-mix concrete is deposited into a hopper at the front of the machine from a truck mounted concrete mixer. This is then fed over a vibrator in the centre of a mould. The mix is vibrated into the form of the mould, and emerges at the rear of the machine in one long continuous kerb as the machine moves along. Operation is carried out by a crew of 4: a driver/operator, a shute controller, who guides the concrete from the truck mixer into the hopper of the variformer; a leveller; and a finisher, who deals with any blemishes in the newly extruded kerb, and who also cuts contraction joints in the kerb at 5 metre intervals. Power is from a 4 cylinder diesel engine coupled to 2 hydraulic pumps, one of which operates the drive, vibrator and auger, while the other controls steering and an overdrive facility. The kerb takes about 4 hours to dry. In the United Kingdom, the fastest laying speed that has been achieved is 684 metres of kerb per day, on the m50 in 1987. Other contracts include the m5 between junctions 4 and 4a, and on the thetford a11 bypass. (TRRL)

  • Availability:
  • Corporate Authors:

    Reed Business Information, Limited

    Quadrant House, The Quadrant
    Brighton Road
    Sutton, Surrey  United Kingdom  SM2 5AS
  • Authors:
    • Mathias, A
  • Publication Date: 1989-3-23

Media Info

  • Pagination: p. 42-43
  • Serial:
    • CONTRACT JOURNAL
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00493484
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Apr 30 1990 12:00AM