US3566557A - Prefabricated trellis for the execution without temporary supports of flooring for civil and industrial structures - Google Patents

Prefabricated trellis for the execution without temporary supports of flooring for civil and industrial structures Download PDF

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Publication number
US3566557A
US3566557A US746473A US3566557DA US3566557A US 3566557 A US3566557 A US 3566557A US 746473 A US746473 A US 746473A US 3566557D A US3566557D A US 3566557DA US 3566557 A US3566557 A US 3566557A
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Prior art keywords
prefabricated
trellis
ribs
flooring
execution
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Expired - Lifetime
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US746473A
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English (en)
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Rino Comolli
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • E01D19/125—Grating or flooring for bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed

Definitions

  • This invention relates to a bridge structure including prefabricated frames or structural units allowing the execution without temporary supports of flooring for bridges and in particular of overhanging decks of bridges, in normal or prestressed reinforced concrete.
  • An object of the present invention is to eliminate the disadvantages of the known technology indicated above, both generally in the field of prestressed or normal reinforced concrete structures for civil and industrial constructions, and in particular in the construction of bridges with overhanging decks allowing the realisation of the said decks on supporting beams of any type, without the use of the traditional temporary forms, while at the same time maintaining all the advantages derived from casting the slab in situ.
  • the prefabricated frame comprises essentially at least two spaced ribs, joined over at least part of their development by cross slabs suitable to serve as self-supporting moulding forms particularly for those projecting parts of a slab overhanging from the edge beams, thereby permitting the casting of the slab substantially in situ without temporary forms.
  • the axes of the frame ribs are arranged orthogonally to the axis of the principal supporting beams, so as to appear orthogonal to the longitudinal inflection planes of the principal beams and to ensure the best condition for the union by simple adherence between the trellis and the cast in place concrete, even without the necessity of iron bars or stirrups projecting from the ribs.
  • the prefabricated trellis of the present invention can have the cross slab limited to the overhanging zones of the edge beams, thus reducing the weight of the trellises themselves to a minimum, with possibly one or more short tracts of cross slab corresponding with the internal zone, fixed to one or more, transverse secondary ribs, with the object of giving the trellis an adequate rigidity during the operations of transport and erection on site.
  • the height of the ribs of the prefabricated trellis is less than the height of the finished slab of the deck, thus permitting the insertion during casting in situ operations of all steel reinforcements, both longitudinal and transversal, required by the stress calculations of the said slab.
  • FIG. 1 illustrates the prefabricated trellis according to the invention, through section 11 of FIG. 2;
  • FIG. 2 is a plan view of the trellis according to FIG. 1;
  • FIG. 3 is a transverse section through the line IIIIII of FIG. 2 in enlarged scale
  • FIG. 4 is a transverse section through the line IV-IV of FIG. 2 in enlarged scale
  • FIG. 5 represents a plan of assembly of the prefabricated trellis supported on beams perpendicular to the longitudinal extension of the trellis in reduced scale;
  • FIG. 6 is a transverse section of a bridge structure taken according to line VIVI of FIG. 5;
  • FIGS. 7 and 8 are details, in section, of FIG. 6 in enlarged scale.
  • the prefabricated trellis or structural unit is indicated in its entirety by 1; the trellis 1 is formed from three ribs 2, of decreasing transverse section from the central zone 2' towards the external zones 2" (corresponding to the overhanging parts of the slab to be cast in situ). At the external Zones 2" the trellis comprises the backing or bottom slabs 3, fixed to the ribs. At a part of the central zone 2' the trellis 1 presents backing or bottom slabs 4, of limited dimensions and a transversal rib 5.
  • an upwardly projecting edge 5' Provided on the end of the backing slab 3 is an upwardly projecting edge 5'.
  • the dimensions of this slab 6 are naturally calculated as a function of the dimensions of the cavity which is to be obtained, and is therefore variable according to requirements.
  • the height of the ribs 2 and 5 and of the edge 5 is calculated such that it is less than the height of the finished slab or concrete layer 8 (FIGS. 7, 9).
  • the prefabricated-trellises 1 are arranged on the principal supporting beams 7, with the axes of their ribs 2 extending widthways with respect to the lengthways extension of the bridge or orthogonal to the axes of the beams 7.
  • the reinforcement of the trellis of concrete is not shown and may be of any kind.
  • the backing slabs 3 of the prefabricated trellises 1 constitute self-supporting moulding frames for casting the slab.
  • the so-called caps are placed which are already in current use.
  • the beams 7 are supported on piers 10.
  • the prefabricated trellis 1 with tracts of backing slab corresponding also with the said zones between the webs of the beams 7.
  • the trellis 1 can be mounted upside down with respect to the attached diagrams, that is with the ribs 2 turned downwards.
  • the backing slabs 3 constitute a continuous supporting plane for the in situ casting 8 while the parts of the ribs 2 projecting underneath the backing slabs 3 can remain visible in the finished structure and in order to contain the cast concrete of the slab the ribs 2 may project on the opposite side of the backing slab.
  • a relevant advantage of the present invention consists of the fact that the presence in the finished structure of the trellis 1 (the various parts of which can be considered in the static calculations as contributing to the cast structure, or can be considered simply as a nonrecoverable caisson) does not in the least compromise the static efiiciency of the overall structure.
  • the number, shape and dimensions of the ribs 2 and the dimensions of the backing slabs 3 of the prefabricated trellises 1 can vary according to each application, according to the width of the spans and the loads and according to the transporting and erection limitations.
  • holes can be arranged in the ribs of the prefabricated trellises to allow the possible passage of prestressing tendons when dealing with prestressed reinforced concrete structures.
  • a bridge structure having a lengthways extension and a widthways extension and including at least two pier structure's spaced from one another in the lengthways direction of the bridge structure, at least two beam structures spaced from one another in the widthways direction of the bridge structure and extending in said lengthways direction, said beam structures being supported on said pier structures, and wherein, according to the improvement, the bridge structure includes further a plurality of prefabricated troughlike structural units having generally a rectangular shape and having their length extending in said widthways direction, said structural units being supported on said beam structures and having a substantial part of their length extending cantileverwise at both ends thereof beyond said beam structures, said structural units being arranged in contacting side by side relationship to each other over the lengthways extension of said beam structures, each of said structural units comprising at least three continuous load bearing longitudinal ribs extending according to the length of said structural unit parallel to said widthways direction and spaced from one another in said lengthways direction of the bridge structure, said longitudinal ribs having intermediate portions bearing directly against said beam structures, terminal ribs disposed trans

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
US746473A 1967-07-28 1968-07-22 Prefabricated trellis for the execution without temporary supports of flooring for civil and industrial structures Expired - Lifetime US3566557A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1893367 1967-07-28
OA53340A OA02868A (fr) 1967-07-28 1968-08-03 Tronçon pour éxécution de tabliers dans les constructions civiles, industrielles et constructions de ponts.

Publications (1)

Publication Number Publication Date
US3566557A true US3566557A (en) 1971-03-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US746473A Expired - Lifetime US3566557A (en) 1967-07-28 1968-07-22 Prefabricated trellis for the execution without temporary supports of flooring for civil and industrial structures

Country Status (5)

Country Link
US (1) US3566557A (xx)
AT (1) AT285663B (xx)
CH (1) CH490592A (xx)
FR (1) FR1574584A (xx)
OA (1) OA02868A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794433A (en) * 1971-07-08 1974-02-26 Schupack Ass Segmental precast concrete post-tensioned overpass bridges with cantilevered abutment
US3872532A (en) * 1973-03-15 1975-03-25 Said Cornelius By Said Pulpane Prefabricated bridge
US3906687A (en) * 1973-10-09 1975-09-23 Morris Schupack Segmental precast concrete post-tensioned overpass bridges with cantilevered abutment
US4313383A (en) * 1979-10-23 1982-02-02 Stephen Parazader Guideway units for elevated guideways
US5052309A (en) * 1988-11-08 1991-10-01 Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann Track carrier for a high speed magnetic levitation transport system
US10895047B2 (en) 2016-11-16 2021-01-19 Valmont Industries, Inc. Prefabricated, prestressed bridge module

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2738580B1 (fr) * 1995-09-08 1997-11-28 Quille Entreprise Structure de tablier de pont et procede pour realiser le tablier
ES2354663B2 (es) * 2008-08-01 2012-01-12 Structural Research S.L. Viga prefabricada para pasarela.
AT524664B1 (de) 2021-06-09 2022-08-15 Kollegger Gmbh Verfahren zur Herstellung einer Brücke aus Fertigteilträgern und Fahrbahnplattenelementen
AT526724A1 (de) 2022-12-02 2024-06-15 Kollegger Gmbh Verfahren zur Herstellung einer Brücke aus Pfeilersegmenten, Längsträgern und Fahrbahnplattenelementen
AT526142B1 (de) 2022-12-02 2023-12-15 Kollegger Gmbh Verfahren zur Herstellung einer Brücke aus Längsträgern und Fahrbahnplattenelementen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794433A (en) * 1971-07-08 1974-02-26 Schupack Ass Segmental precast concrete post-tensioned overpass bridges with cantilevered abutment
US3872532A (en) * 1973-03-15 1975-03-25 Said Cornelius By Said Pulpane Prefabricated bridge
US3906687A (en) * 1973-10-09 1975-09-23 Morris Schupack Segmental precast concrete post-tensioned overpass bridges with cantilevered abutment
US4313383A (en) * 1979-10-23 1982-02-02 Stephen Parazader Guideway units for elevated guideways
US5052309A (en) * 1988-11-08 1991-10-01 Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann Track carrier for a high speed magnetic levitation transport system
US10895047B2 (en) 2016-11-16 2021-01-19 Valmont Industries, Inc. Prefabricated, prestressed bridge module
US11149390B2 (en) 2016-11-16 2021-10-19 Valmont Industries, Inc. Prefabricated, prestressed bridge module

Also Published As

Publication number Publication date
OA02868A (fr) 1970-12-15
CH490592A (de) 1970-05-15
AT285663B (de) 1970-11-10
FR1574584A (xx) 1969-07-11

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