This article describes the repair and strengthening of eight concrete bridges on the Catterick bypass section of the Al trunk road in England. The main contractor John Mowlem chose to use hydrodemolition to cut out the damaged concrete. The specialist company Laser Civil Engineering was asked to use its high-pressure water-jetting Conjet Robot 362 on the bridge decks, joint areas, and parapets, before Mowlem replaced the old concrete with new reinforced concrete. Mowlem is working on all eight bridges simultaneously, 24 hours a day, in this #2M contract for the Highways Agency (HA), to minimise disruption to traffic. Nevertheless, the bypass has been reduced to one lane in each direction, with a 50mph speed limit and a contraflow, for the duration of the three-month project. Consulting engineer Halcrow has designed and supervised a range of repair work on behalf of the HA. Mowlem has had to carry out re-waterproofing and drainage improvements, install new parapets and barriers, replace bearings and bearing shelves, and paint structural steelwork in addition to the hydrodemolition. 240cu. m had to be removed by the remotely operated, computer-controlled Conjet Robot 362, which made cuts ranging from 90mm to 720mm deep in one pass.

  • Corporate Authors:


    LONDON,   United Kingdom  EC1R 4QX
  • Publication Date: 2000-6


  • English

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Filing Info

  • Accession Number: 00796536
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 2 2000 12:00AM