US3221461A

US3221461A - Beam construction

Info

Publication number: US3221461A
Application number: US147258A
Authority: US
Inventors: Grunfeld Michael
Original assignee: Individual
Current assignee: Individual
Priority date: 1961-10-24
Filing date: 1961-10-24
Publication date: 1965-12-07
Anticipated expiration: 1982-12-07

Description

Dec. 7, 1965 M. GRUNFELD BEAM CONSTRUCTION 2 Sheets--Sheerl l Filed Oct. 24, 1961 INVENTOR M. GRUNFELD BEAM CONSTRUCTION 2 Sheets-Shea?l 2 Dec. 7, 1965 Filed oct. 24, 1961 United States Patent O 3,221,461 BEAM CNSTRUCTION Michael Grunfeld, 4560 Sperry St., Los Angeles, Calif. Filed Oct. 24, 1961, Ser. No. 147,258 2 Claims. (Cl. 52-376) This invention relates to building construction and more especially to the construction of beams for shoring forms for concrete.

In the building industry shoring forms for pouring concrete oors and slabs have been extensively developed heretofore, and are of many types. In such construction, a condition often exists presenting a problem which has not heretofore been satisfactorily solved and that is the provision of beam structures wherein it is often necessary or desirable to provide a cantilever type of beam for shoring adjacent walls or over open spaces. Cantilever type beams are wellknown in general, however, those of the prior art have usually been either bulky, complicated, or expensive in relation to the particular job to which they are intended to be put. The present invention has been developed to overcome these subjections and deficiencies in prior art beam structures and as a result a more satisfactory beam has been produced providing novel cantilever action,

It is therefore the primary purpose and objective of this invention to provide a novel beam construction for shoring frames for concrete and the like having improved cantilever action.

A `more particular object of the invention is to provide an improved beam construction having a cantilever type action wherein the extent of cantilever portion may be readily changed to meet the changed conditions.

Another object of the invention is to provide a novel beam construction as in the previous objects wherein the cantilever portion may be readily added to or removed from the remainder of the beam.

A further object of the invention is to provide an improved beam construction having cantilever features, the beam being a composite of steel truss members to provide tensile strength together with wood joist members to provide rigidity and compression strength.

Other objects and advantages will appear more fully in the following specification, reference being had to the accompanying drawings wherein:

FIGURE 1 is a perspective View of a portion of a shoring frame showing a beam of this invention as a part thereof.

FIGURE 2 is a side elevation view of the beam shown in FIGURE 1.

FIGURE 3 is a fragment-ary View of an end portion of the beam shown in FIGURE 2.

FIGURE 4 is a sectional View, enlarged, taken along the line 4-4 of FIGURE 3.

FIGURE 5 is a sectional View, enlarged, taken along the line 5-5 of FIGURE 2.

FIGURE 6 is a partial side View as seen from the line 6--6 of FIGURE 5.

FIGURE 7 is a View similar to FIGURE 1 showing a modified form of beam construction of this invention.

FIGURE 8 is a sectional View, enlarged, taken along the line 8 8 of FIGURE 7.

Referring more particularly to the drawing, a preferred form of the beam of this invention as shown in FIGURES l to 6 inclusive, is comprised of a pair of truss members 10 having a general W-shaped or zigzap formation, the bottoms of these members being secured as by welding 11 to a tension rod or bar member 12. The truss members 10 are inclined from each other in the form of a V and the tops thereof are welded as at 13 to the underside of a plurality of spacer plate members 14. These spacer members have a central channel portion 15 and end flanges 16 formed with a marginal tongue or lip 17. The ends of the truss members 10 are secured to a pair of spacer plate members 18 generally similar to spacer members 14 except for having in turned end flanges 19 of the side walls thereof. A flat-lying wood beam 20 is supported by and in the channels 15 of the

spacer members

14 and 18 and may be secured therein as by screws 21.

A support plate 22 has pairs of end slots 23 through which slots the end truss member rods 10a extend, the plates being weld secured to the rods, if desired. A pair of angle members 24 are secured, as by welding, on plates 22 and spaced apart to receive a wedge bar member 25. This bar member has a tapering upper edge 26 at one end thereof and the end of the bar member have lower end extensions 27 to form locking keys.

A pair of beam support plates 28 have upstanding side wall fianges 29 and a web or spacer member 30 is weld secured to and between the flanges 29 of the supporting plates. This web is positioned at an angle corresponding to the angle taper 26 of wedge bar member 25. A stiffener or web member 31 is weld secured to each plate 28 and the flange 29 thereof and an auxiliary stiffener member 32 in the form of an inverted U extends through apertures in plate members 28 and may be weld secured to angle members 24 if desired. A pair of rafter beams 33 each have one end thereof supported on the beam support plates 28 which have marginal upturned flanges 34 to prevent lateral shifting thereof.

FIGURE l shows the foregoing described beam in position and carried by a pair of rafters 35 which are supported by post or columns 36. Typical flooring 37 in sheet form, or otherwise, is placed on the several beams as described to constitute the flooring for concrete pouring or the like. Beams 33 are not permanently secured to the truss assembly, which includes truss members 10, bar member 12 and flat beam 20. Beams 33 are seen to be of cantilever type and are secured between

spacer members

14 and 18 and support plates 28 by clamping action resulting from driving wedge bar member 25, longitudinally under the inclined web or spacer 30. This wedge member seats and bears on support plate 22.

It will thus be apparent that cantilever beams 33 can be secured to the struss structure at variable positions so that the effective length of the beam assembly can be extended to increase its length. This is of particular value and significance inasmuch as it is often necessary or desirable that the outer ends of the centilever beams 33 be placed over or above a building part or object which prevents the placing of a post or column 36 nearby. A beam supporting channel member 14a is weld secured to truss member rods 10 and provides support for the central or intermediate portions of flat beam member 20.

FIGURES 7 and 8 show a modification of the beam structure and means for clamping the cantilever beams to the truss part of the assembly. In these figures the beam is composed of a single group of truss members 40 in zigzag or W formation, the lower portions of the W being Welded to a tension rod or bar 41. A guide channel member 42 is weld secured at the first apex of the truss members 40 removed from each end of the truss and a terminal guide channel member 43 is secured to the end of each end truss member 40, there being a tension tie rod member 44 secured between the upper ends of the end truss members 40.

A flat beam 45 rests on and is secured to the

several channel members

42 and 43 and is secure-d thereby as by screws in the manner of beam member 21). A nut 46 is Welded to the underside of the juncture of truss members 40, and a nut 47 is welded to the underside of each guide channel member 43. A tie bolts 48 having threads at both ends, has one end run into nut 46 and a nut 49 at its lower end secures a beam support plate 50 and a similar bolt and nut and plate assembly is provided and is secured to guide channel 43 by the nut 46 secured thereto. A pair of cantilever beams 51 have one end thereof supported on one of the pair of plates 50 and clamped to guide

channels

42 and 43 upon tightening of nuts 49 on the tie bolts 48. Cantilever beams 51 are thus adapted for adjustable length positioning with respect to the end of the truss beam construction of FIGURES 1 to 6.

It will be understood that the foregoing description is illustrative rather than restrictive of the invention and that changes and modications may be made without departing from the spirit and scope of the subjoined claims.

What is claimed is:

1. A truss beam comprising:

a lower chord member;

a pair of zig-zag web members secured to said lower chord member .and extending upwardly and outwardly therefrom and having upper and lower apices;

an upper plate member secured to each of said upper apices of said zig-zag web members and extending laterally therefrom;

a bearing plate secured to said web members intermediate said upper and lower apices;

a oating beam supporting plate means adjustably supported on said bearing plate, said supporting plate means including a portion extending laterally from each of said web members in alignment with one of said upper plate members;

a cantilever beam supported on each of said laterally extending portions of said supporting plate means intermediate said upper plate members and said supporting plate means; and

a wedge member disposed intermediate said bearing plate and said supporting plate means for adjusting said supporting plate means, whereby the beams supported thereby are forced into clamped engagement with said upper plate members.

2. A truss beam as stated in claim 1 wherein the upper plate member comprises a supporting channel portion intermediate said laterally extending portions and said channel portion of the plate members is secured to said upper apices of said web members; and

a wooden nailing member supported by said channel members intermediate said cantilever beams.

References Cited bythe Examiner UNITED STATES PATENTS 2,835,358 5/1958 Lusum 189-37 X 2,974,762 3/ 1961 Hunnebeck 189-37 3,008,556 11/1961 Hinze 189--37 3,023,863 3/1962 Klas 189-37 FOREIGN PATENTS 180,714 1/ 1955 Austrailia. 1,100,070 9/1955 France.

310,752 l/ 1956 Switzerland.

322,908 8/ 1957 Switzerland.

JACOB L. NACKENOFF, Prima/y Examiner.

EARL I. WITMER, Examiner.

Claims

1. A TRUSS BEAM COMPRISING: A LOWER CHORD MEMBER; A PAIR OF ZIG-ZAG WEB MEMBERS SECURED TO SAID LOWER CHORD MEMBER AND EXTENDING UPWARDLY AND OUTWARDLY THEREFROM AND HAVING UPPER AND LOWER APICES; AN UPPER PLATE MEMBER SECURED TO EACH OF SAID UPPER APICES OF SAID ZIG-ZAG WEB MEMBERS AND EXTENDING LATERALLY THEREFROM; A BEARING PLATE SECURED TO SAID WEB MEMBER INTERMEDIATE SAID UPPER AND LOWER APICES; A FLOATING BEAM SUPPORTING PLATE MEANS ADJUSTABLY SUPPORTED ON SAID BEARING PLATE, SAID SUPPORTING PLATE MEANS INCLUDING A PORTION EXTENDING LATERALLY FROM EACH OF SAID WEB MEMBERS IN ALIGNMENT WITH ONE OF SAID UPPER PLATE MEMBERS; A CANTILEVER BEAM SUPPORTED ON EACH OF SAID LATERALLY EXTENDING PORTIONS OF SAID SUPPORTING PLATE MEANS INTERMEDIATE SAID UPPER PLATE MEMBERS AND SAID SUPPORTING PLATE MEANS; AND A WEDGE MEMBER DISPOSED INTERMEDIATE SAID BEARING PLATE AND SAID SUPPORTING PLATE MEANS FOR ADJUSTING SAID SUPPORTING PLATE MEANS, WHEREBY THE BEAMS SUPPORTED THEREBY ARE FORCED INTO CLAMPED ENGAGEMENT WITH SAID UPPER PLATE MEMBERS.