WATERING DOWN BRIDGE DECK CONCRETE

The Conjet hydrodemolition system, developed by Atlas Copco for the demolition of aging and damaged concrete, uses a high pressure water jet which operates at between 1000-1200 bar. This is housed in a small, remotely controlled robot unit mounted on rubber tyres. At the front of the unit is a cross-mounted feed which can cover breadths of up to 1.8 m. Inside the feed is a high pressure nozzle which directs the jet. The nozzle moves back and forth along the feed, directing the high pressure jet down onto the surface. In the latest version, the nozzle oscillates rapidly backwards and forwards causing the jet to trace a zig-zag course across the surface. Damaged concrete is broken and sound concrete left in place. If necessary, the water jet will expose and clean the rebar in one operation removing both adhering concrete and rust scale. The rough surface left by the system provides a suitable bonding surface for fresh concrete. The process produces no dust, very little noise and generates no vibrations that may damage a bridge structure. The robot is controlled by programmable microprocessors. Further details of the Conjet hydrodemolition system are provided in this article, including a description of a hydrodemolition project which involved repair of a highway bridge in St. Louis, Illinois.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3831968
• Corporate Authors:

  Faversham House Group

  Faversham House, 111 St James Road
  Croydon, Surrey CR9 2TH,   England 
• Publication Date: 1989-7

Media Info

• Features: Photos;
• Pagination: p. 26
• Serial:
  • Highways
  • Volume: 57
  • Issue Number: 1951
  • Publisher: Alad Limited
  • ISSN: 0142-6168
  • Serial URL: http://www.highways-mag.co.uk

Subject/Index Terms

• TRT Terms: Asphalt pavements; Bridge decks; Concrete; Concrete pavements; Demolition; Equipment; Microprocessors; Performance; Pressure; Repairing; Waterjets
• Uncontrolled Terms: High pressure; Hydrodemolition
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00486113
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Aug 31 1989 12:00AM