Details are given of the operation of the "curb king", an easi-pour slip-form trimmer-paver made by the Juron Manfacturing Co. of Huron, South Dakota, USA, which was imported by Sir Alfred AcAlpine for constructing over 15 km of in-situ concrete drainage channel along the 10 km section of the Dover to Chilworth section of the M27 motorway. The machine which has a hydrostatic drive to each of the four independently controlled drive wheels, requires only a small team of operators and can achieve an output of approximately 1 1/2-2 M per minute. It works to a pre-set string line, with sensors which follow it to control automatically the height, level and direction of the machine. The all hydraulic machine is powered by a 75 kw case diesel engine and has a hydraulic auger cross-feed to transfer concrete from the hopper into the slip-form, and a rotary trimmer for precision fine grading of the sub-base. Attention is drawn to the need of using a low-slump concrete and careful blend of aggregates and fines to ensure strength and finish. Costs are quoted. The author reports upon whether kerbing machines are viable in the U.K. and suggests that there are insufficient long runs of road to justify the high cost equipment. The traditional method of laying road edges with pre-cast concrete kerb stones allows maximum flexibility, but is a labour intensive operation. Nevertheless there are still major roads to be laid, and the slip-form paver saves man-power and equipment. It is capable of producing any kind of kerb section, but for each kind a separate slip-form must be used - each costing approximately 400lb. The author points out that the critical question, due to the cost of the machine (30,000lb) concerning any contractor, is the continuity of work which is rather unpredictable. However if a limited number of specialist contractors were to undertake in-situ kerbing contracts as sub-contractors, this problem may be overcome. Mention is made of, "a guide to good practice for road edge detail", which goes into greater detail. It is concluded that the viability of operating cost is of great importance, but due to lack of use in this country there are no hard figures to go on: nevertheless it is likely that with easi-pour it would be both cheaper and faster. /TRRL/

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Authors:
    • BARNARD, D
  • Publication Date: 1975-3-13

Media Info

  • Features: Photos;
  • Pagination: p. 42-43
  • Serial:
    • Volume: 264
    • Issue Number: 4984
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00129672
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM