Crashing, shoe-stripping and winch-stripping are three different methods that one West Coast contractor uses to quickly and safely remove the falsework and strip forms under its concrete box girder bridge spans. Those methods speed construction and also improve job safety by virtually eliminating hazardous hand-stripping of overhead forms. Kasler Corporation, San Bernardino, California, is constructing a section of the new Century Freeway including part of the interchange with the existing Harbor Freeway in Los Angeles. Work under the $26.5 million contract started in late 1986 and is expected to be completed by mid-1989, somewhat ahead of schedule. Included in that contract is an 1800-ft.-long concrete box girder bridge to carry ramp traffic from the Century Freeway north onto the Harbor Freeway. The structure varies in width from 48 ft. at one end to 87 ft. at the other. It has 15 spans of about 120 ft. designed as five 3-span units. The hollow concrete superstructure is 5 ft. deep and has four to nine cells between girders within the box. The bottom of the box varies from about 15 ft. above ground at the narrow end to about 45 ft. at the wide end. More than thirty 6- to 8-ft.-thick pier shafts support the structure. The shafts are arranged one, two or three across at each span. This article describes the falsework construction, the forming and pouring of the boxes, form crashing, shoe-stripping, and winch-stripping. Form crashing is used only where the drop is 12 ft. or less. The winch system is used only on high spans or when stripping over roads and waterways.

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  • Corporate Authors:

    Cahners Publishing Company

    275 Washington Street
    Newton, MA  United States  02158-1630
  • Authors:
    • Munn, W D
  • Publication Date: 1988-10

Media Info

  • Features: Photos;
  • Pagination: p. 60-62
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00476855
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 31 1988 12:00AM