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Precast bridges

  • US 5,870,789 A
  • Filed: 09/24/1997
  • Issued: 02/16/1999
  • Est. Priority Date: 11/30/1994
  • Status: Expired due to Fees
First Claim
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1. Precast bridge comprising, in terrain needing deep foundation,(a) abutments, wings, and gravity retaining walls, each abutment, wing, or retaining wall having (1) a longitudinal axis, (2) a bearing shoe aligned along said axis, (3) precast walls placed over the bearing shoe, (4) a cradle formed as an integral unit prepared on site by positioning and assembling said bearing shoe along said axis, placing said precast walls over said bearing shoe, and after this, pouring the concrete over said bearing shoe and said precast walls to form said integral unit, and (5) TT sections of precast elements of reinforced and/or prestressed concrete able to resist the horizontal and vertical forces said TT sections being vertically erected in said cradle and anchored therein by further poured concrete;

  • (b) central span supports including precast elements of columns and caps on top of said columns;

    (c) rectangular section beams supported by integral bents on said caps;

    (d) box beams with horizontal wings resting over said rectangular section beams;

    (e) bearing slabs laid over a surface of said horizontal wings of said box beams; and

    (f) piles initially formed and poured prior to preparation of said cradle, said cradle being tied to said piles by protruding steel from the top of the piles prior to the concrete being poured over said bearing shoes and precast walls, thereby forming an integral unit of the cradle and the pile.

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