Contractors eyeing the huge potential job market for inter-building hot-water systems could have learned much in recent months by visiting downtown St. Paul, Minn. Here, amid skyscrapers and traffic throngs, old steam piping has given way to an enlarged high-technology system. The job has entailed 50,000 ft. of trenching, mostly in the streets, and a short tunnel. Trench spoil is hauled to dumps while pavement rubble goes to C. S. McCrossan's local commercial recycling plant. Pipe backfill (clean sand) is compacted with gasoline tampers. Streets are restored with high-early-strength concrete, opened to traffic on the third day, and later blacktopped. Traffic crosses over narrower trenches on steel plates. For wider trench crossing, the prefab 10 by 20 ft. bridge units consist of steel plates welded to shallow high-tensile I-beams.

  • Availability:
  • Corporate Authors:

    Technical Publishing Corporation

    1301 South Grove Avenue
    Barrington, IL  United States  60010
  • Publication Date: 1984-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00392611
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Apr 29 1985 12:00AM