US3173193A - Method of manufacturing a lattice girder - Google Patents

Method of manufacturing a lattice girder Download PDF

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Publication number
US3173193A
US3173193A US321605A US32160563A US3173193A US 3173193 A US3173193 A US 3173193A US 321605 A US321605 A US 321605A US 32160563 A US32160563 A US 32160563A US 3173193 A US3173193 A US 3173193A
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United States
Prior art keywords
concrete
upper chord
struts
chord
girder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US321605A
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English (en)
Inventor
Grebner Fritz
Spindler Gerhard
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Individual
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Individual
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Publication date
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Publication of US3173193A publication Critical patent/US3173193A/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
    • E04C3/294—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete of concrete combined with a girder-like structure extending laterally outside the element
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/065—Light-weight girders, e.g. with precast parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49623—Static structure, e.g., a building component
    • Y10T29/49625—Openwork, e.g., a truss, joist, frame, lattice-type or box beam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]

Definitions

  • the present invention relates to the manufacture of lattice girders comprising an upper chord, a lower chord and diagonal struts interconnecting the chords. More particularly, it relates to girders wherein the upper chord is a steel rod and the lower chord is a concrete slab, such as are used as reinforcements in the construction of concrete ceilings or floors.
  • a useful lattice girder for concrete floors and ceilings is produced according to the invention by first afixing one end of the diagonal girder struts to the upper chord and then embedding the other end of the struts in a layer of concrete.
  • the concrete layer is prestressed and hardened in the conventional manner to produce a prestressed concrete slab which constitutes the lower girder chord, the concrete shrinking in the conventional manner when the stress is removed therefrom.
  • the upper chord is temporarily stretched the same length as the hardened concrete shrinks.
  • the temporary stretch of the upper chord will be removed so that the upper chord will return to its original length and will not be warped as the prestressed concrete slab is formed.
  • the upper chord will remain in a fiat plane in .the finished girder.
  • the stretching of the upper chord which is usually a steel rod or bar, is preferably effected simultaneously with the tensioning of the usual tendons of the prestressed concrete in a conventional concrete tensioning device. This stretching may be effected by tensioning the upper chord or by heating it, preferably electrically.
  • the pretension method of making prestressed concrete slabs is well known and will, therefore, not be further described herein. Generally, it requires that a multiplicity of tendons be drawn to a high tension and held under stress between two anchor points on a stressing bed. Concrete is then cast around the tendons and is permitted to harden and mature sufiiciently to develop an anchorage by bond, at which time the tension at the end of the line of tendons is released, transferring a force into the con crete. During hardening, the concrete shrinks.
  • FIG. 1 is a partial side view of a reinforcing member for a lattice girder with a lower chord consisting of prestressed concrete;
  • FIG. 2 shows the reinforcing member, of FIG. 1 stretched in a longitudinal direction and with concrete cast about its lower ends;
  • FIG. 3 shows the finished lattice girder.
  • the reinforcing member of the illustrated lattice girder is shown to consist of an upper chord constituted by a circumferentially circular steel rod 1 and of diagonal struts having one end afiixed to the upper chord.
  • the illustrated struts are formed of a sinuously bent structural steel rod 2 whose alternate apieces are welded to rod 1.
  • Similar types of reinforcing members for lattice girders include girders to whose upper chord two or more mutually inclined series of struts are welded so as to form a three-dimensional reinforcement, and the present invention obviously is not limited to the specifically illustrated reinforcement structure.
  • FIG. 2 either before the lower ends of the struts are embedded in a concrete layer 3 (shown in broken lines in FIG. 2) or at the time the tendons in the cast concrete layer are tensioned in the conventional manner, the upper chord is stretched in the direction of arrows 4 and 5, the struts having first been afiixed to the upper chord.
  • the ends of the rod 2 may be anchored to the same tensioning device at both sides of the stressing bed, to which the tendons in the concrete are anchored so that the upper chord and the tendons in the concrete are anchored so that the upper chord and the tendons are stretched simultaneously.
  • the upper chord may be heated, for instance electrically, to obtain the required stretch, which is exaggerated in FIG. 2 to make the principles of the invention more obvious.
  • the upper chord is temporarily stretched the same length as the hardened concrete layer shrinks when the tension is removed therefrom.
  • this temporary stretch is released from the upper chord, it returns to its original length, as shown in FIG. 3.
  • it In its finished condition, i.e. after the lattice girder has been removed from the stressing bed, it will consist of a flat lower chord consisting of prestressed concrete and of a reinforcing member with a straight upper chord, thus being ready for use in the construction of concrete ceilings and floors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Bridges Or Land Bridges (AREA)
  • Rod-Shaped Construction Members (AREA)
US321605A 1962-11-09 1963-11-05 Method of manufacturing a lattice girder Expired - Lifetime US3173193A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER33856A DE1184059B (de) 1962-11-09 1962-11-09 Verfahren zum Herstellen von Fachwerktraegern fuer Stahlbetonrippendecken

Publications (1)

Publication Number Publication Date
US3173193A true US3173193A (en) 1965-03-16

Family

ID=7404194

Family Applications (1)

Application Number Title Priority Date Filing Date
US321605A Expired - Lifetime US3173193A (en) 1962-11-09 1963-11-05 Method of manufacturing a lattice girder

Country Status (7)

Country Link
US (1) US3173193A (ja)
AT (1) AT241080B (ja)
BE (1) BE639419A (ja)
CH (1) CH416034A (ja)
DE (1) DE1184059B (ja)
DK (1) DK122336B (ja)
GB (1) GB1000741A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305612A (en) * 1964-06-05 1967-02-21 Conodec Inc Method for forming a prefabricated truss deck
US20090019809A1 (en) * 2007-07-17 2009-01-22 Noboru Kiji Welding method and steel plate deck

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5255212A (en) * 1975-10-30 1977-05-06 Takenaka Komuten Co Concrete slab
JPS5255213A (en) * 1975-10-30 1977-05-06 Takenaka Komuten Co Construction method of concrete slab

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1770932A (en) * 1929-05-17 1930-07-22 Arthur G Leake Method of strengthening structural members under load
US1770933A (en) * 1929-05-17 1930-07-22 Arthur G Leake Method of strengthening structural members under load
US2887762A (en) * 1950-04-03 1959-05-26 Preload Co Inc Method of making prestressed structural member
US3007233A (en) * 1959-04-24 1961-11-07 Dean Method of prestressing tension bars of a lock gate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1770932A (en) * 1929-05-17 1930-07-22 Arthur G Leake Method of strengthening structural members under load
US1770933A (en) * 1929-05-17 1930-07-22 Arthur G Leake Method of strengthening structural members under load
US2887762A (en) * 1950-04-03 1959-05-26 Preload Co Inc Method of making prestressed structural member
US3007233A (en) * 1959-04-24 1961-11-07 Dean Method of prestressing tension bars of a lock gate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305612A (en) * 1964-06-05 1967-02-21 Conodec Inc Method for forming a prefabricated truss deck
US20090019809A1 (en) * 2007-07-17 2009-01-22 Noboru Kiji Welding method and steel plate deck
US7921562B2 (en) * 2007-07-17 2011-04-12 Ihi Corporation Welding method and steel plate deck

Also Published As

Publication number Publication date
BE639419A (ja)
AT241080B (de) 1965-07-12
CH416034A (de) 1966-06-30
GB1000741A (en) 1965-08-11
DE1184059B (de) 1964-12-23
DK122336B (da) 1972-02-21

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