US3256670A - Prefabricated steel joist adapted for the reinforcement of floors - Google Patents

Prefabricated steel joist adapted for the reinforcement of floors Download PDF

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Publication number
US3256670A
US3256670A US20951062A US3256670A US 3256670 A US3256670 A US 3256670A US 20951062 A US20951062 A US 20951062A US 3256670 A US3256670 A US 3256670A
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Prior art keywords
joist
reinforcement
floors
joists
plate
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Tersigni Ennio
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Tersigni Ennio
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/08Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders
    • E04C3/09Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders at least partly of bent or otherwise deformed strip- or sheet-like material
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/065Light-weight girders, e.g. with precast parts
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0421Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section comprising one single unitary part
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/043Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the hollow cross-section comprising at least one enclosed cavity
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/046L- or T-shaped

Description

June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS 6 Sheets-Sheet 1 Filed July 15, 1962 INVENTOR MJJMM ATTORNEYS June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 13, 1962 6 Sheets-Sheet 2 Y\ a 15 l INVENTOR BY wmwdw ATTORNEYS June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 15, 1962 6 Sheets-Sheet 3 9W4 INVENTOR ATTORNEYS June 21, 1966 E. TERSIGNI 3,255,670

PREFABRIGATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT 0F FLOORS Filed July 13, 1962 6 Sheets-Sheet 4 52 E e E 3 E"- "E a a E is E E N\ i E "-5 k INVENTOR ATTORNEY June 21, 1966 E. TERSIGNI 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 15, 1962 6 Sheets-Sheet 5 INVENTOR BY UJMWK-M,

ATTORNEYS June 21, 1966 TERs|GN| 3,256,670

PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT OF FLOORS Filed July 13, 1962 6 Sheets-Sheet 6 Fly. [8 ii? INVENTOR BY MJLM MPM ATTORNEYS United States Patent 3,256,670 PREFABRICATED STEEL JOIST ADAPTED FOR THE REINFORCEMENT 0F FLOORS Ennio Tersigni, Via Salaria 330B, Rome, Italy Filed July 13, 1962, Ser. No. 209,510 Claims priority, application Italy, July 26, 1961, 13,507/ 61 1 Claim. (Cl. 52-634) The object of this invention is to provide girders made of steel sheets, for the reinforcement of building floors, suitable to be manufactured at low cost, in mass production to obtain uniformly sized elements adapted to be easily and quickly installed.

This invention provides a double tubular construction with a connection web, obtained from a steel sheet having a thickness from 1 mm. to 3 mm., by an automatically performed shaping process and having any desired length. The raw steel sheet can be previously punched in order to obtain a particular array of holes causing the metal joist to form, in reinforced concrete, an integral unit with the concrete mix which enters through said holes of both the punched tubular members forming the upper and lower wings, and of the web of the joists, so that these will :be entirely embedded within the concrete, particularly when vibration is used.

The particular profile of the joist allows it to be rigid even during the concrete casting and setting stages and to form a support for the casing made of a ribbed sheet for retaining the casting. The joists also form the skeleton and reinforcement of the floor structure.

Joists made of steel sheets for floor reinforcement can be utilized for the carrying structure of a building of reinforced concrete, or for buildings having bearing walls made of bricks or stones, by anchoring said joists to the reinforcing rods of the concrete in the first case or by arranging them within the connection seams in the second case.

The joists can also form the carrier units of the floor and relieve the stresses acting on cement pillars or on iron columns or on bearing walls.

This invention will be hereinafter described only by way of non-limitative example with reference to the attached drawings showing one preferred embodiment of the said invention.

In the drawings:

FIG. 1 is a cross-sectional view of the joist according to this invention;

FIG. 2 is a partial side elevation;

FIG. 3 is a bottom plan view;

FIG. 4 is a top plan view;

FIG. 5 is a perspective view;

FIG. 6 is a cross-sectional view of two coupled carrying joists, with a relief joist and associated connecting plates:

FIG. 7 is a top plan view corresponding to FIG. 6;

FIG. 8 shows the detail of the upper connecting plate, in top plan view;

FIG. 9 shows a cross-sectional View taken along the plane IXIX of FIG. 8;

FIG. 10 shows a cross-sectional view taken along the plane X-X of FIG. 8;

FIG. 11 shows the lower connecting plate, in bottom plan view;

FIG. 12 shows a cross-sectional View of FIG. 11 taken along the plane XIIXII of said figure;

FIG. 13 shows a cross-sectional view taken along the plane XIII-XIII of FIG. 11;

FIG. 14 shows a longitudinal section-a1 view of the plate of FIG. 11;

FIG. 15 shows the profile of a relief joist with a lower channel for a simple rest;

3,256,670 Patented June 21, 1966 FIG. 16 is a side elevational view;

FIG. 17 is a perspective view of the joist of FIG. 15;

FIG. 18 is a front elevational view of the relief joist with a reversed V plate;

FIG. 19 is a side view corresponding to that of FIG. 18;

FIG. 20 is a top plan view.

With reference to FIGS. 1 to 5, this invention provides a metal joist manufactured from steel sheet, sheared and bent by an industrial, continuous and automatic machining. The joist comprises a base or supporting portion 1 which is connected to the web 2 by means of the two inclined sides 3, and ends at its top with a tubular rib i, the top of which is provided with a continuous ridge 5.

As shown in the FIGURES 3 and 4, holes 6 can be provided in the base plate, while other holes 7 start from the sides 3, and pass through the web 2 and the tubular upperrib 4, so as to obtain a light-weight shape without affecting its strength. As aforesaid, the joist is manufactured from a single steel sheet which is bent and welded along the junction edge 8.

FIGURES 6 and 7 show two coupled joists 22 in twin arrangement, connected to a third joist 21 arranged transversely to the joists 22 to relieve the stresses acting thereon.

The connection of the joist 22 with the transverse joist 21 is obtained by an upper plate 9 and a lower plate It) which are shaped to engage both the joists 22 and transverse joist 21 so as to form a rigid unit thus avoiding punching, bolting or other connection devices requiring difficult operations.

The upper plate 9 (shown also in FIGURES 8 to 10) is provided with a longitudinal rib 11 resting on the ridge 5 of the relief joist and with two parallel ribs 12 which rest on the ridges of the two carrying joists located sideby-side. The connection of the upper joist portion is completed by folding the flange 13 against the associated side of the rib 4 of the outer joist.

Thelower connecting plate 10 (shown also in FIGURES 11 to 14) consists of two stiffening ribs 14 provided under the flange of the relief joist, two flanges 15 which are bent against the sides of said joist, and two cross-flanges 16 which are folded onto the outer sides of the two carrier joists located side-by-si-de, as shown in FIGURE 6. In FIGURES l5, l6 and 17 the joist rests on a metal support channel 17 to be used in case of simple support.

If the joist is to be connected to a support metal structure, as for instance a pillar or a girder of metal shape, a connecting plate It is provided having an inverted V shape and located transversely with respect to the head of the joist, said plate 18 being provided with fastening flanges 19 having holes 20 for the direct fixing by means of bolts or any other equivalent means.

This invention has been disclosed in one preferred embodiment and it will be apparent that various changes might be made in the form, construction and arrangement of the parts without departing from the scope of the invention.

What is claimed is:

A joist structure for reinforcement of building floors in concrete mixes comprising in combination a pair of joists arranged side by side and having a hollow lower support portion having in cross section an isosceles triangle shape, the apex of said triangle being directed upwardly, a hollow upper portion having in cross section an isosceles triangle shape, the apex of said triangle being directed downwardly and the leg of said last named portion opposite said apex having a dihedral shape with its apex extending upwardly, a pair of contiguous webs connecting said port-ions to one another, one of said webs forming a unit with said portions and the other web comprising projections of both portions welded to one another, said webs and portions having holes for embedding the joist within the concrete, a third similar joist arranged perpendicularly to said pair of joists, an upper plate having a central longitudinal groove engaging the upper portion of said third joist and two cross grooves engaging the upper portions of said joist pair, a lower plate having two upwardly turned pliable flanges for engaging the lower portions of said joist pair and two upwardly turned rigid flanges engaging the lower portion of said third joist, said upper and lower plate rigidly connecting said joist to :form a unit.

References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS 5/1960 France.

OTHER REFERENCES 10 The Lewen System: page 14, copyright 1912.

FRANK L. ABBOTT, Primary Examiner.

HENRY C. SUTHERLAND, Examiner.

15 M. O. WARNECKE, Assistant Examiner.

US20951062 1962-07-23 1962-07-13 Prefabricated steel joist adapted for the reinforcement of floors Expired - Lifetime US3256670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR904775A FR1329412A (en) 1962-07-23 1962-07-23 prefabricated girders of steel sheets intended to constitute the armature floors

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Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381439A (en) * 1965-10-21 1968-05-07 United States Gypsum Co Structural member
US3479777A (en) * 1968-03-22 1969-11-25 Concrete Conduit Co Inc Underground utility vault with a ventilator-type grate
US3698224A (en) * 1970-11-16 1972-10-17 Siderurgica Occidental C A Process for the production of steel structural shapes
US3761046A (en) * 1971-07-09 1973-09-25 Stelmo Ltd Table for concrete casting
US4394807A (en) * 1974-04-04 1983-07-26 Carroll Frank E Sheet metal structural shape
US4507901A (en) * 1974-04-04 1985-04-02 Carroll Frank E Sheet metal structural shape and use in building structures
US4731560A (en) * 1970-08-06 1988-03-15 Owens-Illinois Television Products, Inc. Multiple gaseous discharge display/memory panel having improved operating life
WO1991017328A1 (en) * 1990-05-03 1991-11-14 Ram Navon Structural beam
US5163225A (en) * 1988-07-25 1992-11-17 Tube Technology Pty Ltd. Process for forming a structural member utilizing high frequency electrical induction or resistance welding
US5403986A (en) * 1990-09-28 1995-04-04 Tube Technology Pty. Ltd. Structural member and method of making by cold rolling followed by induction or resistance welding
US5501053A (en) * 1990-09-28 1996-03-26 Tube Technology Pty., Ltd. Interengageable structural members
US6115986A (en) * 1996-08-30 2000-09-12 Bhp Steel (Jla) Pty Ltd Stackable box stud
US6131362A (en) * 1998-02-04 2000-10-17 Buecker Machine & Iron Works, Inc. Sheet metal beam
US20020108345A1 (en) * 1999-11-12 2002-08-15 Walker Steven H. Metal structural member
US20040182041A1 (en) * 2001-07-18 2004-09-23 Bodnar Ernest R. Sheet metal stud and composite construction panel and method
WO2007134790A1 (en) * 2006-05-23 2007-11-29 Airbus France Pressure-sealed floor for aircraft
US20080134611A1 (en) * 2005-11-21 2008-06-12 Usg Interiors, Inc. Grid tee for suspension ceiling
US20080155934A1 (en) * 2006-12-29 2008-07-03 Usg Interiors, Inc. Easy cut suspension grid
US20080196332A1 (en) * 2007-02-15 2008-08-21 Surowiecki Matt F Sheet metal header beam
US20080264936A1 (en) * 2007-03-05 2008-10-30 Christian Godenzi Container for air freight transport and fuselage of an aircraft for freight transport
US20090013628A1 (en) * 2005-12-07 2009-01-15 Stefan Krestel Girder-like structural element composed of individual parts connected to one another
US20100032523A1 (en) * 2006-10-10 2010-02-11 Airbus France Aircraft fuselage made from longitudinal panels and method of producing such a fuselage
US20110078968A1 (en) * 2005-08-05 2011-04-07 James Ferrell Single Strip - Double Web Ceiling Grid Member
US20110162320A1 (en) * 2003-06-23 2011-07-07 Smorgon Steel Litesteel Products Pty Ltd Beam
EP2527554A1 (en) * 2011-05-23 2012-11-28 Vbi Ontwikkeling B.V. Beam and block floor
US20120328898A1 (en) * 2009-07-22 2012-12-27 Best Joist Inc. Roll formed steel beam
US8397462B2 (en) 2011-06-03 2013-03-19 Usg Interiors, Llc Open web grid runner
US9021759B2 (en) 2012-06-13 2015-05-05 Usg Interiors, Llc Serpentine insert for open web grid
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US9820148B2 (en) 2015-10-30 2017-11-14 Bank Of America Corporation Permanently affixed un-decryptable identifier associated with mobile device
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Citations (7)

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Publication number Priority date Publication date Assignee Title
US774484A (en) * 1902-11-01 1904-11-08 Chauncey F Lufkin Metallic railway-tie.
US991603A (en) * 1910-09-22 1911-05-09 George William Brooks Fireproof beam.
US1351615A (en) * 1920-01-28 1920-08-31 Brown Edward Eugene Metal construction
US1357073A (en) * 1920-01-09 1920-10-26 Mooney Dermot Joseph Metal construction
US1924880A (en) * 1930-02-07 1933-08-29 Budd Edward G Mfg Co Open truss girder
US2092472A (en) * 1936-12-04 1937-09-07 Rafter Machine Company Stud and rafter
FR1235452A (en) * 1959-05-27 1960-07-08 Improvement in prefabricated buildings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US774484A (en) * 1902-11-01 1904-11-08 Chauncey F Lufkin Metallic railway-tie.
US991603A (en) * 1910-09-22 1911-05-09 George William Brooks Fireproof beam.
US1357073A (en) * 1920-01-09 1920-10-26 Mooney Dermot Joseph Metal construction
US1351615A (en) * 1920-01-28 1920-08-31 Brown Edward Eugene Metal construction
US1924880A (en) * 1930-02-07 1933-08-29 Budd Edward G Mfg Co Open truss girder
US2092472A (en) * 1936-12-04 1937-09-07 Rafter Machine Company Stud and rafter
FR1235452A (en) * 1959-05-27 1960-07-08 Improvement in prefabricated buildings

Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381439A (en) * 1965-10-21 1968-05-07 United States Gypsum Co Structural member
US3479777A (en) * 1968-03-22 1969-11-25 Concrete Conduit Co Inc Underground utility vault with a ventilator-type grate
US4731560A (en) * 1970-08-06 1988-03-15 Owens-Illinois Television Products, Inc. Multiple gaseous discharge display/memory panel having improved operating life
US3698224A (en) * 1970-11-16 1972-10-17 Siderurgica Occidental C A Process for the production of steel structural shapes
US3761046A (en) * 1971-07-09 1973-09-25 Stelmo Ltd Table for concrete casting
US4394807A (en) * 1974-04-04 1983-07-26 Carroll Frank E Sheet metal structural shape
US4507901A (en) * 1974-04-04 1985-04-02 Carroll Frank E Sheet metal structural shape and use in building structures
US5373679A (en) * 1988-07-25 1994-12-20 Tube Technology Pty Ltd Structural member and process for forming same
US5163225A (en) * 1988-07-25 1992-11-17 Tube Technology Pty Ltd. Process for forming a structural member utilizing high frequency electrical induction or resistance welding
WO1991017328A1 (en) * 1990-05-03 1991-11-14 Ram Navon Structural beam
US5403986A (en) * 1990-09-28 1995-04-04 Tube Technology Pty. Ltd. Structural member and method of making by cold rolling followed by induction or resistance welding
US5501053A (en) * 1990-09-28 1996-03-26 Tube Technology Pty., Ltd. Interengageable structural members
US6115986A (en) * 1996-08-30 2000-09-12 Bhp Steel (Jla) Pty Ltd Stackable box stud
US6131362A (en) * 1998-02-04 2000-10-17 Buecker Machine & Iron Works, Inc. Sheet metal beam
US20020108345A1 (en) * 1999-11-12 2002-08-15 Walker Steven H. Metal structural member
US20040182041A1 (en) * 2001-07-18 2004-09-23 Bodnar Ernest R. Sheet metal stud and composite construction panel and method
US7231746B2 (en) * 2001-07-18 2007-06-19 Bodnar Ernest R Sheet metal stud and composite construction panel and method
US8181423B2 (en) 2003-06-23 2012-05-22 Smorgon Steel Litesteel Products Pty Ltd. Beam
US20110162320A1 (en) * 2003-06-23 2011-07-07 Smorgon Steel Litesteel Products Pty Ltd Beam
US20110078968A1 (en) * 2005-08-05 2011-04-07 James Ferrell Single Strip - Double Web Ceiling Grid Member
US20080134611A1 (en) * 2005-11-21 2008-06-12 Usg Interiors, Inc. Grid tee for suspension ceiling
US8266860B2 (en) 2005-11-21 2012-09-18 Usg Interiors, Llc Grid tee for suspension ceiling
US7832168B2 (en) * 2005-11-21 2010-11-16 Usg Interiors, Inc. Grid tee for suspension ceiling
US20090158684A1 (en) * 2005-11-21 2009-06-25 Usg Interiors, Inc. Grid tee for suspension ceiling
US8201384B2 (en) * 2005-12-07 2012-06-19 Stefan Krestel Girder-like structural element composed of individual parts connected to one another
US20090013628A1 (en) * 2005-12-07 2009-01-15 Stefan Krestel Girder-like structural element composed of individual parts connected to one another
US8567150B2 (en) * 2006-05-23 2013-10-29 Airbus Operations Sas Aircraft pressurized floor
RU2452656C2 (en) * 2006-05-23 2012-06-10 Эрбюс Операсьон (Сас) Aircraft sealed floor
US20100282903A1 (en) * 2006-05-23 2010-11-11 Airbus France Aircraft pressurized floor
WO2007134790A1 (en) * 2006-05-23 2007-11-29 Airbus France Pressure-sealed floor for aircraft
US20100032523A1 (en) * 2006-10-10 2010-02-11 Airbus France Aircraft fuselage made from longitudinal panels and method of producing such a fuselage
US20080155934A1 (en) * 2006-12-29 2008-07-03 Usg Interiors, Inc. Easy cut suspension grid
US20080196332A1 (en) * 2007-02-15 2008-08-21 Surowiecki Matt F Sheet metal header beam
US7891155B2 (en) * 2007-02-15 2011-02-22 Surowiecki Matt F Sheet metal header beam
US20080264936A1 (en) * 2007-03-05 2008-10-30 Christian Godenzi Container for air freight transport and fuselage of an aircraft for freight transport
US8672265B2 (en) 2007-03-05 2014-03-18 Airbus Operations Sas Container for air freight transport and fuselage of an aircraft for freight transport
US20120328898A1 (en) * 2009-07-22 2012-12-27 Best Joist Inc. Roll formed steel beam
US9975577B2 (en) * 2009-07-22 2018-05-22 Ispan Systems Lp Roll formed steel beam
EP2527554A1 (en) * 2011-05-23 2012-11-28 Vbi Ontwikkeling B.V. Beam and block floor
EP2899328A3 (en) * 2011-05-23 2015-08-12 Vbi Ontwikkeling B.V. Beam and block floor
EP2527554B1 (en) 2011-05-23 2015-03-18 Vbi Ontwikkeling B.V. Beam and block floor
US8397462B2 (en) 2011-06-03 2013-03-19 Usg Interiors, Llc Open web grid runner
US9021759B2 (en) 2012-06-13 2015-05-05 Usg Interiors, Llc Serpentine insert for open web grid
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