US1974730A - Steel girder for concrete structures - Google Patents

Steel girder for concrete structures Download PDF

Info

Publication number
US1974730A
US1974730A US633642A US63364232A US1974730A US 1974730 A US1974730 A US 1974730A US 633642 A US633642 A US 633642A US 63364232 A US63364232 A US 63364232A US 1974730 A US1974730 A US 1974730A
Authority
US
United States
Prior art keywords
concrete
girder
holes
section
rods
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
Application number
US633642A
Inventor
Zollinger Fritz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US1974730A publication Critical patent/US1974730A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • E04C3/29Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293Joists; 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
    • E04C3/294Joists; 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

Definitions

  • My invention relates to improvements in; the erection of metalframed. and reinforced concrete floors, walls, roofs and othersupportingand enclosing parts. of buildings, bridges, silos etc.,
  • Fig. 5' shows perspectively the lower tubular flange portion of the girder with a reinforcing rod 23. running therethrough and being embedded in afilling of concrete.
  • Fig. 6 shows a cross section
  • Fig. 7 a side view
  • Fig. 8 a plan of another example of construction.
  • Fig. 9 shows a perspective View of another example of application of the invention.
  • Fig. 10 shows a perspective view of a further applicationof the invention.
  • Fig-11 is across section of a detail of Fig. 9 to a larger scale.
  • Figs. 1245 showconcrete floors supported by girders, which. aredesigned'according to this inventionsaid floors serving to support a ceiling.
  • the girder or improved design consists of a web 10 of thin metal sheeting, preferably of mild. steel; the lower-edge of the web isformed with a tubular flange 20, while the upper edge is provided with tongues30, 30 adapted to bebent away fromthe web preferably towards alternate sides, asbest seen in Fig. 3, was to act as bracingmembers when the upper section of theweb "is embedded intoa layer of concrete 40.
  • the construction of a ferro-concrete floor ina building can be carriedrout with great speed and economy by means-of the improved girders described above, in the following manner:
  • the girders are placedupon the supporting walls in upright positionby means ofdistance rods and screw:bo1ts 51 extending through holes 11 of which a number are provided in thegirder in alignment to'each other at a suitable distance from its tubular flange 20.
  • In erecting the mold for the concrete floor brackets 60, for supporting the sheeting boards 61, 61 are attached to the girdersby means of clamping bolts 62 which extend through holesbelongingto the set of: holes 11-.refer-redto above.
  • reinforcing rods are placed. into position on'thez indented'upper edge of the girders and other rods 82 may be passed through holes 12 provided for this purpose, whereupon the mold is ready for receiving the mixture of concrete.
  • the lower section of the girders which is not embedded in the concrete may be suitably covered with fire resisting material, as diagrammatically indicated in dot and dash lines in Fig. 1a; or a U1ing-not ably rectangular shape may be provided in the body of the web and supporting tongues 16, 16, laterally projecting from the web 10 at alternate sides of same as seen in Figs. 1-3. 7
  • tubular flange 20 instead of forming the tubular flange 20 with a flattened edge portion 21 abutting against the web 10 as shown in Fig.--la and being'joined thereto by electric welding, a flange of modified design which is cheaper to make may be applied to advantage.
  • bracing tongues 30, 30 may be temporarily bent upwardly so that sheets of expanded metal 90, wire netting or the like can be lowered onto the system of girders as reinforcing elements of particularly light weight, an important factor e. g. in case of solid roofs where a minimum of thickness and weight are desired.
  • girders of the improved design as supporting, reinforcing, stiffening, bracing elements in floors, walls, roofs, columns, and like concrete structures will suggest themselves to practitioners and-a few applications are shown by way of examples in Figs. 611.
  • Figs. 6 to 8 the tongues 30, 30 are shown bent at different angles from those shown in the preceding figures, whilst the holes 15 and their corresponding tongues 16 are made longer, and tongues are also provided adjacent the holes 12 for the passage of the rods 80.
  • a rod 82 is also shown as passing through one of the holes 15.
  • a T-iron 91 provided with spaced notches in its upper flange passes through the holes 11, in which it is secured by wedges 92, and serves to support the sheeting boards 61. Wires or rods may also be passed through the holes 11 to ensure a better hold of fire resistin material when this is applied.
  • Fig. 10 shows an arrangement wherein some of the tongues 30, 30 are bent vertically up wards, whilst others serve to hold sheets of expanded metal 90 in position.
  • the reinforcing rod 23 is also curved upwardly at its free end so as to increase its engagement in the surrounding concrete.
  • Fig. 12 is a cross section of a floor in which the layer of concrete 40 of the girder supports a concrete floor 98. From this floor depend suspension rods 94, which together with the wires or rods 93, serve to support expanded metal 95 for a ceiling.
  • Fig. 12a shows in longitudinal section the use of a girder according to the invention associated with a girder of I-section, this figure being at right angles to Fig. 12, but the wires and rods 93, 94 are omitted.
  • Figs. 13, 13a, 13b show in cross section, plan, and in section on the line II of the plan another application of the arrangement described in connection with Figs. 6 to 11.
  • the spaces between the ribs of reinforced concrete may be left open or if desired filled in with bricks 98, preferably apertured bricks, known as Hourdis.
  • Fig. 14 the concrete 40' of the girder supports a reinforced plaster floor 99, Whilst the rods 93 serve to support expanded metal sheets provided in a ceiling.
  • Fig. 15 shows a floor in which the girder is completely embedded in concrete.
  • a slab of concrete which is reinforced by. and structurally associated with a girder of special design, the latter comprising a sheet metal Web, presenting a lower zone, adapted to take up tensile stresses, and an upper zone, the latter beingembedded in the said slab of concrete and being provided along its'top edge with bracing tongues, laterally extending therefrom, the tension zone of the girder which downwardly projects from underneath the slab of concrete, being provided along its lower edge with a tubular'flange.
  • a slab of concrete which is reinforced by and structurally associated with a girder of special'design, the latter comprising a sheet metal web, presenting'a lower zone, adapted to take up tensile stresses and an upper zone, the latter being embedded in the said 'slab of concrete and being provided along its top edge with bracing tongues laterally extending therefrom, the tension zone of the girder, which downwardly projects from underneath the slab of concrete, being provided along its lower edge with a tubular fiange,s paced holes being provided in the upper section of the compression zone of the girder for the insertion of reinforcing rods, crosswisely extending therethrough.
  • ma concrete structure-a slab of concrete which is reinforced by and structurally associated with a girder of special design, the latter comprising a sheet metal web, presenting a lower zone, adapted to take up tensile-stresses, and an upper zone, the latter being embedded in the said slab of concrete and being provided along its top edge with bracing tongues laterally extending therefrom, the tension zone of the girder,'which downwardly projects from underneath the slab of concrete, being provided along its lower edge with a tubular flange-spaced holes being provided in the upper section and in the lower section of the compression zone of the girder for the insertion of reinforcing rods, crosswisely extending therethrough,--the holes in the said lower section being of substantiallyrectangular shape and being formed with auxiliary tongues. outwardly extendingfrom the base of said holes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)

Description

Sept. 25, 1934. F. ZOLLINGER 1,974,730
' STEEL GIRDER FOR CONCRETE STRUCTURES Filed Sept. 17, 1952 2 Sheets-Sheet 1 in V672 for.
Patented Sept. 25, 1934 PATENT? OFFICE STEEL GIRDER FOR CONCRETE STRUCTURES Fritz. Zollinger, Merseburg, Germany Application September 17, 1932, Serial No. 633,642
InGermany September 17, 1931 .3 Glaims.
My invention relates to improvements in; the erection of metalframed. and reinforced concrete floors, walls, roofs and othersupportingand enclosing parts. of buildings, bridges, silos etc.,
and more particularly toimprovements inspecial shaped steelgirders or beams of the type. which are made of relatively thin steel sheeting and. which are in many cases preferredas framing-supporting-studding-and bracing elements inconcrete structures where extreme lightness combined with strength and-speedy erection are the chief consign thetimproved girder; that itcanbe quickly cut into the proper lengthseven by handoperated tools,. without the use of heavy; machinery; andthatsitisw an. easy task even for not highly trained welders tojoin for re-use short remnant length which otherwise would :be useless, by autogenous welding or; other weldingaor soldering processes, so that practically nowaste, occurs.
Another "feature of importance of the steel sheet girders ofimproved. design-. according, to thisdnvention is the fact. that they can .be closely. piled up uponeach: other so that largenumbers of girders canrbe 1 packed: into. relatively small boxes, as lar as their crosssection: isrconcemed; and that they can. be easily shippedonaccountoftheir small total weight even intorremote districts. far from railroad trafiic.
stillrother objects aimed at. by. this invention and advantages obtained therebywillibecomeapiparent it hereinafter to' practitioners in l the ferroconcrete building; trade;
The nature and scope of the. invention are briefly: outlined: in the: appended claims and will be more. fullyunderstood tromlthe' .tollowing speciflcation takentogether with the accompanying drawings in which Figs. 1 and 1a are cross sections, taken along Fig. 4 isa cross section through a shipping box showing anumber ofgirders piled up therein;
Fig. 5' shows perspectively the lower tubular flange portion of the girder with a reinforcing rod 23. running therethrough and being embedded in afilling of concrete.
Fig. 6 shows a cross section, Fig. 7 a side view, and Fig. 8 a plan of another example of construction. r
Fig. 9 shows a perspective View of another example of application of the invention.
Fig. 10 shows a perspective view of a further applicationof the invention.
Fig-11 is across section of a detail of Fig. 9 to a larger scale.
Figs. 1245 showconcrete floors supported by girders, which. aredesigned'according to this inventionsaid floors serving to support a ceiling. The girder or improved design consists of a web 10 of thin metal sheeting, preferably of mild. steel; the lower-edge of the web isformed with a tubular flange 20, while the upper edge is provided with tongues30, 30 adapted to bebent away fromthe web preferably towards alternate sides, asbest seen in Fig. 3, was to act as bracingmembers when the upper section of theweb "is embedded intoa layer of concrete 40.
The construction of a ferro-concrete floor ina building can be carriedrout with great speed and economy by means-of the improved girders described above, in the following manner: The girders are placedupon the supporting walls in upright positionby means ofdistance rods and screw:bo1ts 51 extending through holes 11 of which a number are provided in thegirder in alignment to'each other at a suitable distance from its tubular flange 20. In erecting the mold for the concrete floor brackets 60, for supporting the sheeting boards 61, 61 are attached to the girdersby means of clamping bolts 62 which extend through holesbelongingto the set of: holes 11-.refer-redto above.
Whenever required according to" static calcu= lations viz. inconsiderationof the maximum load on the floor, reinforcing rods are placed. into position on'thez indented'upper edge of the girders and other rods 82 may be passed through holes 12 provided for this purpose, whereupon the mold is ready for receiving the mixture of concrete.
After the concrete has become hardened and the sheeting has been removed, the lower section of the girders which is not embedded in the concrete may be suitably covered with fire resisting material, as diagrammatically indicated in dot and dash lines in Fig. 1a; or a cei1ing-not ably rectangular shape may be provided in the body of the web and supporting tongues 16, 16, laterally projecting from the web 10 at alternate sides of same as seen in Figs. 1-3. 7
Instead of forming the tubular flange 20 with a flattened edge portion 21 abutting against the web 10 as shown in Fig.--la and being'joined thereto by electric welding, a flange of modified design which is cheaper to make may be applied to advantage.
My experimental work has shown that a flange the extreme edge 22 ofwhich extends into its tubular cavity, as shownin Figs. 1 and 5, possesses such stiffness that welding or otherwise joining the edges concerned can be dispensed with.
In Fig. 2 it is indicated by dotted lines how the bracing tongues 30, 30 may be temporarily bent upwardly so that sheets of expanded metal 90, wire netting or the like can be lowered onto the system of girders as reinforcing elements of particularly light weight, an important factor e. g. in case of solid roofs where a minimum of thickness and weight are desired.
Various other ways of using girders of the improved design as supporting, reinforcing, stiffening, bracing elements in floors, walls, roofs, columns, and like concrete structures will suggest themselves to practitioners and-a few applications are shown by way of examples in Figs. 611.
In Figs. 6 to 8 the tongues 30, 30 are shown bent at different angles from those shown in the preceding figures, whilst the holes 15 and their corresponding tongues 16 are made longer, and tongues are also provided adjacent the holes 12 for the passage of the rods 80. A rod 82 is also shown as passing through one of the holes 15.
In Figs.'9 and 11 a T-iron 91, provided with spaced notches in its upper flange passes through the holes 11, in which it is secured by wedges 92, and serves to support the sheeting boards 61. Wires or rods may also be passed through the holes 11 to ensure a better hold of fire resistin material when this is applied.
Fig. 10 shows an arrangement wherein some of the tongues 30, 30 are bent vertically up wards, whilst others serve to hold sheets of expanded metal 90 in position. The reinforcing rod 23 is also curved upwardly at its free end so as to increase its engagement in the surrounding concrete.
Fig. 12 is a cross section of a floor in which the layer of concrete 40 of the girder supports a concrete floor 98. From this floor depend suspension rods 94, which together with the wires or rods 93, serve to support expanded metal 95 for a ceiling.
Fig. 12a shows in longitudinal section the use of a girder according to the invention associated with a girder of I-section, this figure being at right angles to Fig. 12, but the wires and rods 93, 94 are omitted.
Figs. 13, 13a, 13b show in cross section, plan, and in section on the line II of the plan another application of the arrangement described in connection with Figs. 6 to 11. The spaces between the ribs of reinforced concrete may be left open or if desired filled in with bricks 98, preferably apertured bricks, known as Hourdis.
In Fig. 14 the concrete 40' of the girder supportsa reinforced plaster floor 99, Whilst the rods 93 serve to support expanded metal sheets provided in a ceiling. Fig. 15 shows a floor in which the girder is completely embedded in concrete.
What I claim is:
'1. In a concrete structure a slab of concrete, which is reinforced by. and structurally associated with a girder of special design, the latter comprising a sheet metal Web, presenting a lower zone, adapted to take up tensile stresses, and an upper zone, the latter beingembedded in the said slab of concrete and being provided along its'top edge with bracing tongues, laterally extending therefrom, the tension zone of the girder which downwardly projects from underneath the slab of concrete, being provided along its lower edge with a tubular'flange.
2. In a concrete structure a slab of concrete, which is reinforced by and structurally associated with a girder of special'design, the latter comprising a sheet metal web, presenting'a lower zone, adapted to take up tensile stresses and an upper zone, the latter being embedded in the said 'slab of concrete and being provided along its top edge with bracing tongues laterally extending therefrom, the tension zone of the girder, which downwardly projects from underneath the slab of concrete, being provided along its lower edge with a tubular fiange,s paced holes being provided in the upper section of the compression zone of the girder for the insertion of reinforcing rods, crosswisely extending therethrough.
3. ma concrete structure-a slab of concrete, which is reinforced by and structurally associated with a girder of special design, the latter comprising a sheet metal web, presenting a lower zone, adapted to take up tensile-stresses, and an upper zone, the latter being embedded in the said slab of concrete and being provided along its top edge with bracing tongues laterally extending therefrom, the tension zone of the girder,'which downwardly projects from underneath the slab of concrete, being provided along its lower edge with a tubular flange-spaced holes being provided in the upper section and in the lower section of the compression zone of the girder for the insertion of reinforcing rods, crosswisely extending therethrough,--the holes in the said lower section being of substantiallyrectangular shape and being formed with auxiliary tongues. outwardly extendingfrom the base of said holes.
FRITZ ZOLLINGER.
US633642A 1931-09-17 1932-09-17 Steel girder for concrete structures Expired - Lifetime US1974730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1974730X 1931-09-17

Publications (1)

Publication Number Publication Date
US1974730A true US1974730A (en) 1934-09-25

Family

ID=7846691

Family Applications (1)

Application Number Title Priority Date Filing Date
US633642A Expired - Lifetime US1974730A (en) 1931-09-17 1932-09-17 Steel girder for concrete structures

Country Status (1)

Country Link
US (1) US1974730A (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093932A (en) * 1960-04-22 1963-06-18 Dreier Sidney Floor construction and method of providing same
US3818083A (en) * 1968-11-04 1974-06-18 Hambro Structural Systems Ltd Building method
US3841597A (en) * 1968-11-04 1974-10-15 Hambro Structural Systems Ltd Floor form with connected truss supports
US3845594A (en) * 1968-11-04 1974-11-05 Hambro Structural Systems Ltd Steel joist or composite steel and concrete construction
US3945168A (en) * 1968-11-04 1976-03-23 Hambro Structural Systems Limited Reusable spanner bar
US3979868A (en) * 1968-11-04 1976-09-14 Hambro Structural Systems Ltd. Composite concrete and steel floor construction
US4015396A (en) * 1974-06-11 1977-04-05 Hambro Structural Systems Ltd. Joist
DE2929350A1 (en) 1979-07-20 1981-02-12 Ulrich Dipl Ing Fiergolla Composite beams for building ceilings
US5207045A (en) * 1991-06-03 1993-05-04 Bodnar Ernest R Sheet metal structural member, construction panel and method of construction
WO1998045101A1 (en) * 1995-10-09 1998-10-15 Erik Danielsson Grid-reinforced concrete slab with partially cast-in sheet metal beams and a method of producing the slab
US6122888A (en) * 1991-06-03 2000-09-26 Rotary Press Systems Inc. Construction panel and method of constructing a level portion of a building
WO2000060188A1 (en) * 1999-04-06 2000-10-12 Erik Danielsson A building structure element and stiffening plate elements for such an element
US20030115815A1 (en) * 2001-07-09 2003-06-26 Atorod Azizinamini Composite action system and method
US20050108978A1 (en) * 2003-11-25 2005-05-26 Best Joint Inc. Segmented cold formed joist
US20070175149A1 (en) * 2006-01-17 2007-08-02 Bodnar Ernest R Stud with lengthwise indented ribs and method
US20080000178A1 (en) * 2006-06-20 2008-01-03 Hsu Cheng-Tzu T System and method of use for composite floor
US20110113714A1 (en) * 2006-06-20 2011-05-19 New Jersey Institute Of Technology System and Method of Use for Composite Floor
US20110120051A1 (en) * 2003-10-28 2011-05-26 Best Joist Inc. Supporting system with bridging members
US8407966B2 (en) 2003-10-28 2013-04-02 Ispan Systems Lp Cold-formed steel joist
US8726606B2 (en) 2006-05-18 2014-05-20 Paradigm Focus Product Development Inc. Light steel trusses and truss systems
US8943776B2 (en) 2012-09-28 2015-02-03 Ispan Systems Lp Composite steel joist
US8950151B2 (en) 2008-09-08 2015-02-10 Ispan Systems Lp Adjustable floor to wall connectors for use with bottom chord and web bearing joists
US9975577B2 (en) 2009-07-22 2018-05-22 Ispan Systems Lp Roll formed steel beam
US11459755B2 (en) 2019-07-16 2022-10-04 Invent To Build Inc. Concrete fillable steel joist

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093932A (en) * 1960-04-22 1963-06-18 Dreier Sidney Floor construction and method of providing same
US3818083A (en) * 1968-11-04 1974-06-18 Hambro Structural Systems Ltd Building method
US3841597A (en) * 1968-11-04 1974-10-15 Hambro Structural Systems Ltd Floor form with connected truss supports
US3845594A (en) * 1968-11-04 1974-11-05 Hambro Structural Systems Ltd Steel joist or composite steel and concrete construction
US3945168A (en) * 1968-11-04 1976-03-23 Hambro Structural Systems Limited Reusable spanner bar
US3979868A (en) * 1968-11-04 1976-09-14 Hambro Structural Systems Ltd. Composite concrete and steel floor construction
US4015396A (en) * 1974-06-11 1977-04-05 Hambro Structural Systems Ltd. Joist
DE2929350A1 (en) 1979-07-20 1981-02-12 Ulrich Dipl Ing Fiergolla Composite beams for building ceilings
US5207045A (en) * 1991-06-03 1993-05-04 Bodnar Ernest R Sheet metal structural member, construction panel and method of construction
US6122888A (en) * 1991-06-03 2000-09-26 Rotary Press Systems Inc. Construction panel and method of constructing a level portion of a building
WO1998045101A1 (en) * 1995-10-09 1998-10-15 Erik Danielsson Grid-reinforced concrete slab with partially cast-in sheet metal beams and a method of producing the slab
WO2000060188A1 (en) * 1999-04-06 2000-10-12 Erik Danielsson A building structure element and stiffening plate elements for such an element
US7007434B1 (en) 1999-04-06 2006-03-07 Erik Danielsson Building structure element and stiffening plate elements for such an element
US20030115815A1 (en) * 2001-07-09 2003-06-26 Atorod Azizinamini Composite action system and method
US6871462B2 (en) * 2001-07-09 2005-03-29 Board Of Regents Of University Of Nebraska Composite action system and method
US8407966B2 (en) 2003-10-28 2013-04-02 Ispan Systems Lp Cold-formed steel joist
US20110120051A1 (en) * 2003-10-28 2011-05-26 Best Joist Inc. Supporting system with bridging members
US20050108978A1 (en) * 2003-11-25 2005-05-26 Best Joint Inc. Segmented cold formed joist
US20070175149A1 (en) * 2006-01-17 2007-08-02 Bodnar Ernest R Stud with lengthwise indented ribs and method
US8726606B2 (en) 2006-05-18 2014-05-20 Paradigm Focus Product Development Inc. Light steel trusses and truss systems
US20080000178A1 (en) * 2006-06-20 2008-01-03 Hsu Cheng-Tzu T System and method of use for composite floor
US7779590B2 (en) * 2006-06-20 2010-08-24 New Jersey Institute Of Technology Composite floor system having shear force transfer member
US20110113714A1 (en) * 2006-06-20 2011-05-19 New Jersey Institute Of Technology System and Method of Use for Composite Floor
US8661754B2 (en) 2006-06-20 2014-03-04 New Jersey Institute Of Technology System and method of use for composite floor
US8950151B2 (en) 2008-09-08 2015-02-10 Ispan Systems Lp Adjustable floor to wall connectors for use with bottom chord and web bearing joists
US9975577B2 (en) 2009-07-22 2018-05-22 Ispan Systems Lp Roll formed steel beam
US8943776B2 (en) 2012-09-28 2015-02-03 Ispan Systems Lp Composite steel joist
US11459755B2 (en) 2019-07-16 2022-10-04 Invent To Build Inc. Concrete fillable steel joist

Similar Documents

Publication Publication Date Title
US1974730A (en) Steel girder for concrete structures
US8234827B1 (en) Express framing building construction system
US4566240A (en) Composite floor system
US7571580B2 (en) Flooring
US1014157A (en) Floor and ceiling construction.
US4549381A (en) Composite joist system
US2114901A (en) Structural steel system
US2042797A (en) Metal structure
US4050213A (en) Method of erecting a multi-story building
US3841597A (en) Floor form with connected truss supports
US1888181A (en) Concrete building form
US2379636A (en) Method of making reinforced concrete buildings
US3108662A (en) Building construction
US3147571A (en) Concrete bridging beam form
CN212336674U (en) High-rise high-altitude large-span suspended structure construction bearing platform
US1033413A (en) Floor construction.
US869724A (en) Reinforced concrete construction.
US1790495A (en) Joist
US1515257A (en) Metal building structure
US3121933A (en) Erection and stripping of concrete forms
US1141160A (en) Reinforced-concrete building construction.
US1883192A (en) Concrete floor construction
US1105682A (en) Concrete building construction.
US1997950A (en) Building construction
US2285165A (en) Building floor