US3513612A - Extensible beam - Google Patents

Extensible beam Download PDF

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Publication number
US3513612A
US3513612A US745492A US3513612DA US3513612A US 3513612 A US3513612 A US 3513612A US 745492 A US745492 A US 745492A US 3513612D A US3513612D A US 3513612DA US 3513612 A US3513612 A US 3513612A
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United States
Prior art keywords
piece
extension
chord
stringers
ties
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Expired - Lifetime
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US745492A
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English (en)
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Louis Alziari
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Individual
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Individual
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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
    • 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

  • The. invention relates to the telescopic beams which are commonly used in the construction of reinforced concrete floors. These beams arefitted with extensions which slide longitudinally so that the length of a unit can be adjusted to the chord between supports.
  • the beam is made up of an upper chord-piece, usually in the shape of an inverted U, connected by two lateral trellises to the lower chord-piece, more often than not made up of two stringers.
  • the length of the lower chord-piece is shorter than that of the upper chord-piece and the corresponding ends of the two chord-pieces are connected by slanting lateral irons, extending the stringers forming the low chordpiece.
  • the upper part of the extension is so shaped that it can adapt itself to the upper chord-piece of the beam and guide the two units when one slides in relation to the other.
  • the extension After adjustment to the required length, the extension is locked in position against the beam so as to make the whole unit continuous.
  • Locking is elfected by any method of tighteningscrew or wedge-acting on the lower part of the extension, and bearing on a rigid plate fixed on the stringers forming the lower chord-piece of the beam, where they start to extend obliquely.
  • this plate is completely rigid and the slating irons connecting the end of the upper chord-piece of the beam to the corresponding end of the lower chord-piece are formed by extending the two stringers forming the lower chord-piece itself.
  • This construction means that all stresses to which the supporting plate is subjected, resulting both from initial tightening and from the load borne, are transmitted to the lower chord-piece of the beam as well as to the slanting irons extending it.
  • the invention consists of replacing these irons by two ties the lower part of which is connected, not directly to the stringers forming the lower chord-piece of the beam or to a rigid plate forming a brace between them, but on the contrary at points situated between these stringers, on a comparatively flexible plate replacing the previous I rigid plate.
  • FIG. 1 is a side elevation view of the end of a beam with set-in extension.
  • FIGS. 2 and 3 are separate end views of the beam and the extension, while FIG. 4 shows a transversal section of these two units wedged against each other.
  • FIG. 2 shows that the upper chord-piece M of the beam is made up of a sheet 1, in the shape of an inverted U, with wings 22. It is connected by web members or trellises 4-4 to the lower chord-piece made up of lower stringers 3-3.
  • FIG. 3 shows that the upper chord-piece M of the extension is made up of a sheet 8, also in the form of an inverted U, with wings 9, and that it is connected by web members or trellises 10 to the lower chord-piece 'M' here shown as an inverted T11.
  • FIGS. 2 and 4 show that a brace plate 5 is welded to the stringers 33, at the end of. the lower chord-piece of the beam, and bears the means of tightening-here the bolt 7itself welded to the ties T.
  • the brace 5 is comparatively flexible, and the ties T which connect, slantwise, the end X of the lower chord-piece of the beam, by means of the brace plate, to the end Y of the extended upper chord-piece M are welded to this brace at intermediate points between the stringers 3-3, i.e. at points on the brace which follow its movement when it flexes.
  • the contiguous ends of the spaced coplanar plate members are welded and secured on either side of the reinforcements 6 forming the centre of the brace and bearing the internally threaded tightening nut, as is clearly shown in FIG. 2 and 4.
  • the bolt 7 Before placing a load on a beam/extension unit adjusted tothe required length, the bolt 7 is screwed to tighten the two upper chord-pieces M and M against each other, through the intermediary of the lower chordpiece M'., of the extension.
  • the extension When the load is imposed, the extension has a tendency to pivot downwards, in relation to point 0, where it receives the supporting reaction F. Beam/extension contact may then be made at two points X and Y. At Y (end of the extended upper chordpiece M of the beam) the extension applies a force F to the beam. At X, the extension applies a force F1 to the means of tightening 7 borne by the ties T.
  • said beam comprising an upper longitudinal chord, transverselyspaced web members depending from the upper chord, transversely spaced lower stringers carried by the respective web members, the upper chord extending longitudinally beyond the stringers, transversely-spaced ties connecting the end of the upper chord to a cross member on the stringers, said cross memlber comprising a pair of spaced coplanar plate members and an internally threaded tightening nut interposed between said plate members, the ends of the plate members contiguous to said nut being secured thereto and the other ends of said plate members being secured to said stringers, the ends of the ties being joined to said nut, said cross-member being resiliently flexible in the transverse direction of the beam, said tightening nut being positioned centrally in the transverse direction between the points of connection of the crossmember to the stringers, whereby forces exerted by the beam-extension on the tightening nut are transmitted directly to the ties and thus to the end of
  • the beam-extension comprises an upper chord member in the form of a beam of inverted U section, a lower chord member in the form of a beam of inverted T section, and two transversely spaced References Cited UNITED STATES PATENTS 3,008,556 11/1961 Hinze 52632 3,180,463 4/1965 Romek 52632 FOREIGN PATENTS 1,142,665 1957 France. 1,010,484 1965 Great Britain. 1,235,559 1967 Germany.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)
US745492A 1967-07-19 1968-07-17 Extensible beam Expired - Lifetime US3513612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6008617 1967-07-19

Publications (1)

Publication Number Publication Date
US3513612A true US3513612A (en) 1970-05-26

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ID=8970604

Family Applications (1)

Application Number Title Priority Date Filing Date
US745492A Expired - Lifetime US3513612A (en) 1967-07-19 1968-07-17 Extensible beam

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US (1) US3513612A (xx)
BE (1) BE717770A (xx)
DE (1) DE1784182A1 (xx)
GB (1) GB1239051A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080141612A1 (en) * 2006-12-15 2008-06-19 Gerald Bruce Schierding Metal truss system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1142665A (fr) * 1956-02-13 1957-09-20 Poutre perfectionnée
US3008556A (en) * 1957-02-15 1961-11-14 Hinze Otto Formwork girders
US3180463A (en) * 1960-12-30 1965-04-27 Seco Steel Equipment Company P Composite girder assembly
GB1010484A (en) * 1963-01-17 1965-11-17 Kwikform Ltd Improvements in or relating to extensible beams for use in building construction
DE1235559B (de) * 1958-04-23 1967-03-02 Emil Mauritz Huennebeck Dipl I Teleskopartiger Schalungstraeger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1142665A (fr) * 1956-02-13 1957-09-20 Poutre perfectionnée
US3008556A (en) * 1957-02-15 1961-11-14 Hinze Otto Formwork girders
DE1235559B (de) * 1958-04-23 1967-03-02 Emil Mauritz Huennebeck Dipl I Teleskopartiger Schalungstraeger
US3180463A (en) * 1960-12-30 1965-04-27 Seco Steel Equipment Company P Composite girder assembly
GB1010484A (en) * 1963-01-17 1965-11-17 Kwikform Ltd Improvements in or relating to extensible beams for use in building construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080141612A1 (en) * 2006-12-15 2008-06-19 Gerald Bruce Schierding Metal truss system
US7669379B2 (en) * 2006-12-15 2010-03-02 Gerald Bruce Schierding Metal truss system

Also Published As

Publication number Publication date
DE1784182A1 (de) 1971-08-05
GB1239051A (xx) 1971-07-14
BE717770A (xx) 1968-12-16

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