US3045786A - Form supporting girder for use in concrete construction - Google Patents

Form supporting girder for use in concrete construction Download PDF

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Publication number
US3045786A
US3045786A US17117A US1711760A US3045786A US 3045786 A US3045786 A US 3045786A US 17117 A US17117 A US 17117A US 1711760 A US1711760 A US 1711760A US 3045786 A US3045786 A US 3045786A
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US
United States
Prior art keywords
girder
section
box
concrete construction
locking means
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
US17117A
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English (en)
Inventor
Rambelje Henry A De La
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.)
HICO CORP OF AMERICA
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HICO CORP OF AMERICA
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Filing date
Publication date
Application filed by HICO CORP OF AMERICA filed Critical HICO CORP OF AMERICA
Priority to US17117A priority Critical patent/US3045786A/en
Priority to GB10412/61A priority patent/GB943701A/en
Priority to CH339661A priority patent/CH403273A/de
Application granted granted Critical
Publication of US3045786A publication Critical patent/US3045786A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • E04G17/16—Members, e.g. consoles, for attachment to the wall to support girders, beams, or the like carrying forms or moulds for floors, lintels, or transoms
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/50—Girders, beams, or the like as supporting members for forms
    • E04G11/54—Girders, beams, or the like as supporting members for forms of extensible type, with or without adjustable supporting shoes, fishplates, or the like
    • E04G11/56—Girders, beams, or the like as supporting members for forms of extensible type, with or without adjustable supporting shoes, fishplates, or the like of telescopic type

Definitions

  • Form supporting girders 18.1'6 sometimes called temporary, or removable, girders, as they are designed to be removed after the concrete has been poured and has set, and then used on the next construction job.
  • This entails repeated handling of the girders, trucking from job to job or shipment by other carriers. Therefore it is desirable that the girders be made as light in weight as possible. Also it is desirable that the girders be made of corrosion resistant metal to give them a long useful life and avoid need for painting, rust-proofing or other expensive maintenance operations.
  • the best material to satisfy these objectives is a light metal such as aluminum.
  • Aluminum possesses the additional advantage that it can :be formed by the extrusion process which is well adapted to the production of box-like sections of special form to be used as the outer section of a telescopic girder.
  • My invention comprises means for initially freeing an end of the girder so that the girder sections can be easily telescoped for removal.
  • a form-supporting girder comprising a box-like section and an Lbe-am section slidable lengthwise within the box-like section for adjustment ice of the length of the girder, and locking means for holding an outer end surface of the I-beam section pressed against an inner surface of the box-like section, is so constructed that at least one of such surfaces is relieved over a substantial central area so that engaging load transmitting areas of said surfaces are confined primarily to corner portions of the box-like section. I have found that this reduces bending stresses transversely of the boxlike section.
  • the surface that is relieved over a substantial central area may be one or both of the outer transverse surfaces of the l-beam section, one or both of the inner transverse surfaces of the box-like sections, or all or any combination of such adjacent transverse surfaces.
  • the locking means may comprise a load-bearing clamping plate having a surface pressed against an inner surface of the box-like section, at least one of these last-named surfaces being relieved over a substantial central area so that the engaging load transmitting areas are confined primarily to corner portions of the box-like section.
  • a load-carrying shear bracket is secured to the outer end of one of the girder sections.
  • This bracket has a loadsupporting flange for engagement under a horizontal surface of this girder section and an upright flange for attech-ment to an upright portion of the girder section through :a connection in which the attaching means is relieved of shear forces acting in a vertical direction.
  • the I-beam section has upwardly projecting ridges along the outer edge portions of the I-beam flanges.
  • the locking means presses these projecting ridges against the inside surface of the top of the box-like section.
  • FIG. 1 is a side elevational view of a girder constructed in accordance with my invention, showing the girder in use.
  • FIG. 2 is a vertical transverse sectional view of the girder of FIG. 1, drawn to an enlarged scale.
  • FIG. 3 is a perspective view of the removable loadcarrying shear bracket detached from the left hand end of the girder of FIG. 1.
  • FIG. 4 is a perspective view of the load-carrying shear bracket used at the other end of the girder.
  • FIG. 5 is a vertical transverse sectional view showing a modified construction of my girder.
  • FIG. 6 is a vertical transverse sectional view of the inner I-beam section made according to another embodi ment of my invention.
  • FIG. 7 is a detail vertical transverse sectional view of one of the upper corners of a girder utilizing my invention accordingto another modification thereof.
  • FIG. 8 is a diagrammatic side elevational view showing the posture of the girder after the first stripping step has been performed.
  • FIG. 9 is a detail view of the left-hand end of the girder of FIG. 1.
  • FIG. 10 is a detail view of the right-hand end of the girder of FIG. 1.
  • My adjustable form-supporting girder comprises in its general arrangement a box-like section 1 and an I-beam section 2 slidable lengthwise within the box-like section for adjustment of the length of the girder, locking means 3 for holding an inner end surface of the I-beam section pressed against an inner surface of the box-like section, at least one of said surfaces being relieved over a substantial central area 4 (FIG. 2) so that engaging load transmitting areas of said surfaces are confined primarily to corner portions of the box-like section, thereby reducing bending stresses transversely of the box-like section.
  • FIG. 2 In the construction shown in FIG.
  • the surface that is relieved over a substantial central area is one of the outer transverse surfaces of the I-beam section, the I-beam section having upwardly projecting ridges 5 along the outer edge portions of the I-beam flanges.
  • the locking means 3 holds these projecting ridges pressed against the inside surface of the top of the box-like section 1.
  • the locking means shown comprises a rectangular plate 6 having downwardly projecting ridges 7 along the outer edge portions thereof, and a clamping bolt 8 having threaded engagement with the plate. If desired a lock nut 9 may also be provided.
  • the girder section 1 may be formed as two identical aluminum extrusions welded together as 10.
  • Girder section 2 likewise may be made as an aluminum extrusion, making it possible to provide upwardly projecting ridges 5 without any separate machining operation.
  • the plate 6 which can be made as an extrusion and then cut olf into short lengths suitable for the use indicated.
  • girder section 1 is formed as a single extrusion and the flanges of the I-beam section 2 have their edges strengthened by provision of the inwardly turned edges 11.
  • the plate 6 is made to so fit into the lower corners of girder section 1 that the load transferred from the underside of I-beam section 2' to bolt 8 to plate 6 is then transferred directly to the lower inner corners of girder section 1 as shown.
  • the I-beam girder section shown in FIG. 6 is similar to that in FIG. 2 except that the edges of the upwardly projecting ridges 5" are curved in a manner to fit the inner top corners of a box-like girder section similar to that shown in FIG. 5.
  • the surface that is relieved over a substantial area is also possible for the surface that is relieved over a substantial area to be the top inner surface of the outer girder section. This is accomplished by providing shoulders 12 (FIG. 7) in the upper corners of such girder section so that there will be a relieved area over a substantial portion of the top surface of the I-beam.
  • a load-carrying shear bracket 13 adapted to be secured to the outer end of one of the girder sections (here the I-beam section 2) this bracket having a load supporting flange 14 for engagement under a horizontal surface of the girder section and an upright attaching flange 15 with bolt holes for attachment to an upright portion of the girder section, i.e., to the web of the I-beam.
  • the bolt holes in the flange 15 or in the web of the I-beam, or in both, are made enough larger than the size of the bolt so that the connection between flange 15 and the I-beam will not be loaded in vertical shear, all of the vertical shear load being carried, therefore, on the flange 14 of the bracket as indicated by the force of reaction R in FIG. 1.
  • the upper horizontal flange 16 of the bracket rests on a suitable supporting structure such as a beam or the ledger 17. Attention is directed to the fact that a predetermined clearance is provided at a between the underside of the plywood form 18 and the top of flange 116 of the bracket. This space will facilitate stripping operations. Also a clearance is provided at b between the vertical part of the bracket and the side of ledger 17.
  • both the clearances 01 and b, and the clearances a and b serve a dual function: (1) to provide free angling of the grider ends when the clamping means 3 is released so that the girder can sag downwardly as shown in FIG.
  • An adjustable form-supporting girder for concrete construction comprising a box-like section and an I-beam section slidable lengthwise within the box-like section for adjustment of the length of the girder, locking means for holding an outer end surface of the flanges of the I- bearn section pressed against an inner surface of the boxlike section, at least one of said surfaces being relieved over a substantial central area so that engaging load transmitting areas of said surfaces are confined primarily to corner portions of the box-like section, thereby reducing bending stresses transversely of the box-like section, said locking means including a load-bearing clamping plate having a surface pressed against an inner surface of the box-like section to distribute stresses across said inner surface and said locking means further including a clamping bolt having a threaded engagement with said clamping plate.
  • An adjustable form-supporting girder according to claim 1 in which the surface that is relieved over a substantial central area is one of the outer transverse surfaces of the flanges of the I-beam section.
  • An adjustable form-supporting girder for concrete construction comprising a generally rectangular box-like section and an I-bearn section slidable lengthwise within the box-like section, the I-beam section having upwardly projecting ridges along the outer edge portions of the upper I-beam flanges, and locking means for holding said projecting ridges pressed against the inside surface of the top of the box-like section, said locking means including a load-bearing clamping plate having a surface pressed against an inner surface of the box-like section to distribute stresses across said inner surface and said locking means further including a clamping bolt having a threaded engagement with said clamping plate.
  • An adiustable form-supporting girder for concrete construction comprising a box-like section and an I-beam section slidable lengthwise within the box-like section for adjustment of the length of the girder, said I-beam section having transverse upper flanges extending upwardly and outwardly from their juncture with the central web portion of the I, said transverse upper flanges having downwardly extending reinforcing flanges along their edges, and locking means for holding the reinforced edges of said transverse upper flanges against the inside upper surface of the box-like section, said looking means including a load-bearing clamping plate having a surface pressed against an inner surface of the box-like section 15 to distribute stresses across said inner surface and said locking means further including a clamping bolt having a threaded engagement with said clamping plate.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
US17117A 1960-03-23 1960-03-23 Form supporting girder for use in concrete construction Expired - Lifetime US3045786A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17117A US3045786A (en) 1960-03-23 1960-03-23 Form supporting girder for use in concrete construction
GB10412/61A GB943701A (en) 1960-03-23 1961-03-22 Form supporting girder
CH339661A CH403273A (de) 1960-03-23 1961-03-22 Einstellbarer Unterzug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17117A US3045786A (en) 1960-03-23 1960-03-23 Form supporting girder for use in concrete construction

Publications (1)

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US3045786A true US3045786A (en) 1962-07-24

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CH (1) CH403273A (de)
GB (1) GB943701A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293822A (en) * 1963-12-18 1966-12-27 Case Co J I Elongated rigid structural member
US3330086A (en) * 1965-02-02 1967-07-11 Kaiser Aluminium Chem Corp Form supporting girders
US3352081A (en) * 1963-09-09 1967-11-14 Hunnebeck Ag Extensible girder construction and clamping means therefor
US3680711A (en) * 1969-04-30 1972-08-01 Suburban Metal Ind Ltd Decking and shoring beam
US3889779A (en) * 1973-10-23 1975-06-17 Kuemmerlin Walter Length adjustable plank
US3954248A (en) * 1974-12-12 1976-05-04 Stanley Barber Spanner beam hanger assembly
US3993282A (en) * 1972-12-08 1976-11-23 Composite Construction Systems, Inc. Construction form support member
US5234188A (en) * 1989-07-24 1993-08-10 Mcswain Gregoary A Structural supporting system for concrete construction forms
US6378837B1 (en) * 2001-04-27 2002-04-30 Melvin Keller Reusable concrete support frame
WO2013098158A1 (de) * 2011-12-29 2013-07-04 Friedr. Ischebeck Gmbh Paneel für eine system-deckenschalung und system-deckenschalung
WO2013098159A1 (de) * 2011-12-29 2013-07-04 Friedr. Ischebeck Gmbh Paneel für eine system-deckenschalung und system-deckenschalung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US850662A (en) * 1906-05-01 1907-04-16 Ernst Lorenz Bracket for supporting scaffolding and the like.
US1415554A (en) * 1921-01-31 1922-05-09 Arthur G Hatch Floor construction
GB479029A (en) * 1936-07-25 1938-01-25 Joah Haigh Walker Improvements relating to the construction of concrete floors, roofs and like structures cast in situ
US2386161A (en) * 1943-05-24 1945-10-02 Bryant & Son Ltd C Temporary support for use in casting concrete floors and similar purposes
FR1175837A (fr) * 1956-05-29 1959-04-02 Kwikform Ltd Perfectionnements apportés aux poutres extensibles pour supporter des coffrages

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US850662A (en) * 1906-05-01 1907-04-16 Ernst Lorenz Bracket for supporting scaffolding and the like.
US1415554A (en) * 1921-01-31 1922-05-09 Arthur G Hatch Floor construction
GB479029A (en) * 1936-07-25 1938-01-25 Joah Haigh Walker Improvements relating to the construction of concrete floors, roofs and like structures cast in situ
US2386161A (en) * 1943-05-24 1945-10-02 Bryant & Son Ltd C Temporary support for use in casting concrete floors and similar purposes
FR1175837A (fr) * 1956-05-29 1959-04-02 Kwikform Ltd Perfectionnements apportés aux poutres extensibles pour supporter des coffrages

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3352081A (en) * 1963-09-09 1967-11-14 Hunnebeck Ag Extensible girder construction and clamping means therefor
US3293822A (en) * 1963-12-18 1966-12-27 Case Co J I Elongated rigid structural member
US3330086A (en) * 1965-02-02 1967-07-11 Kaiser Aluminium Chem Corp Form supporting girders
US3680711A (en) * 1969-04-30 1972-08-01 Suburban Metal Ind Ltd Decking and shoring beam
US3993282A (en) * 1972-12-08 1976-11-23 Composite Construction Systems, Inc. Construction form support member
US3889779A (en) * 1973-10-23 1975-06-17 Kuemmerlin Walter Length adjustable plank
US3954248A (en) * 1974-12-12 1976-05-04 Stanley Barber Spanner beam hanger assembly
US5234188A (en) * 1989-07-24 1993-08-10 Mcswain Gregoary A Structural supporting system for concrete construction forms
US6378837B1 (en) * 2001-04-27 2002-04-30 Melvin Keller Reusable concrete support frame
WO2013098158A1 (de) * 2011-12-29 2013-07-04 Friedr. Ischebeck Gmbh Paneel für eine system-deckenschalung und system-deckenschalung
WO2013098159A1 (de) * 2011-12-29 2013-07-04 Friedr. Ischebeck Gmbh Paneel für eine system-deckenschalung und system-deckenschalung

Also Published As

Publication number Publication date
GB943701A (en) 1963-12-04
CH403273A (de) 1965-11-30

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