US1772358A - Structural-steel joist - Google Patents

Description

Aug. 5, 1930. R. M=|NTYRE STRUCTURAL STEEL JOIST Filed Oct. 3, 1928 y quate support for pipes and wire conduits. web of the beam` as indicated Vby the nu- 6) Patented Aug.`5,1930 l l i mwa STTES PATENT OFFICE Application mea october 3, 1928. serial No. scanso.

The principal" objects ofthe invention are"V The j oist beam is supportedfrom the vtlange to improve the construction ofexceptionally 8` ofthe beam 7 bya metal strip `9 which light structural steel sections being used forms a'stirrup.` The strip 9 ts against the.`

l as joists for the support of floors between the inclined edge 100i the recess out in the web 5 beams in buildingsparticularlyy to provideY of the beam 1 and the sides of' said: strips allowancer Jfor variations inmeasurementbearebent inwardly to embrace the flat faces tween the beams and to provide' a substantial of the web of the beam 1. a l means for supporting the ceiling rods close The edges ot' the inwardly turned portions upto the walls and also to pro-vide an adel1 of the stirrup 9 are welded securely to thev l'lhe'principal feature of the invention con` meral 12. i. sists in the novel cutting of the ends of the The` upper end of thev stirrupy which eX- joist beam and the novel construction and tends beyond theendi of the joist beam 1 is arrangement of the stirrup supports for the' formed with a longitudinal kdeformation beam whereby the stirrup supports will suspreferably in the form of a rib 13 which ete5 tain the load without iiexure though a sub iects' the very material stifening of the Vstirsta'ntial` distance exists between the' flange of rup member so that in the event of the disthe main beam and the en d of the joist beam, tance between the inside edges oi' the main n said stirrup having a ribbed cross section. j, v beam iianges 8 varying, the rib'portion of 4ln the drawings, VFigure lis a perspective the stlrrup willV present a sufficientV support` C"ur View of my improved'joist vbeam structure against bending under the load.'I l showing the end supported by oneof` the` The .tlat portion 9 of the stirrup 'member` main beams of a building. I extending angularly upward aganstthe .in-

' Figure 2 is a side elevational View of the. @lined edge of the opening cut in the web of joist beam showing the main beam zin y'cross the beam-1 engages the top flange of the beam 75 Section; y 1` and the stirrup and ange are 4securely Figure 3 is anenlarged cross sectional view united 1n aweld joint 141. Y u through the Vupper supporting ends 'of Vthe "l have; shown the stirrup 9rhaving its Strrup. p. e upperend formed kwith a longitudinal rib 13 e0' Prseneday building` construction has to resist the bending stressbut it must be un- Si? adopted the light rolled I-section steel'joist derStoo-d that I may form--this'stirrup Vwith and many diierent forms of devicesfor supany desirable cross-,sectional Shape in Ol'delv porting the ends of these joists from the main toproperlyfsupport the load. f f ,i y y' v. beams of the building, have beenl devised. The Outllnfl Of the SITUPTSSIlg UPOH i "5 In the construction hereinshown, the joist thelange 8 ofthe beam V7 is securely welded 8" 1 is of an ordinary ,I-section of the required infthe joint `15 to saidiiange when the joist' weight f or the floor construction. Each end i '1mg beenpllaeedinposition# Y l j' @f 13h26 lolts 1S @ulg 71th all acute angular 0pm' It'will be notedthatthetop surface ofthe l ing 1n a e we ,v Y j joist is supported in horizontalflalignment 40 A portloi 4 Ofth Well?, @boug threg'qllar with the top surfacev of vthe mainbeamv 7 vso d Y ters of an meh m ept 11- 131e ,t extndlrng that the ioorin'g material-placed thereon can above the bottom flange o thusfornnng an b a r, 1d@ t1 t t, bf 7 f; t1* inverted T-shaped arm at the lbottom of the ecafuec nec, 1y on O 1eeam will lei recess. 30kt' The recess provides aspace inside'of the Whatllalm @s mymlentmnls 95 wall 6 formed by the iireprooiing enclosing 1Aste@lOlS-Constructwni@Olnlrlsmgthe the main beam structure Tand pipes or wire Combmatlon Wlth the mam .bulldmg Strucconduits are extended through these recesses tulrend a loued metal SeCtlOn 0f l St'luP' and are supported by the rigid T-shaped memberpermanently securedtosaid rolledV arms Ll. lsection and havingva single extensionll to rest upon the main building structure, said eXtension having a longitudinal deformation.

p 2. In a structural steel fabrication, a metal beam, and a metal stirrup member permanently secured to the end of the beam in a weld joint and extending outwardly beyond the end of the beam and having a longitudinal rib formed therein to form a rigid extension support. f

3. A steel joist construction, comprising a beam formed of a rolled metal section, and a stirrup memberI formed of a length of metal plate bent intermediate of its length to form horizontally and angularly disposed portions, said stirrup having its angularly disy posed'portion rigidly secured to said rolled section and having its horizontal portion deformed to provide a reinforced extension beyond the end of said rolled metal section for supporting the same on the main'building structure. f

4. A steel joist construction, comprising a rolled metal beam, a metal stirrup member formed of a strip of plate material bent transversely at a spaced distance from one end thereof to form horizontally7 and anuvularly disposed portions, said angularly disposed portions beingrigidly connected to the web portion of said lbeam-at the end thereof with said horizontal portion projecting therebeyond and adapted to rest on the main building structure, said horizontal portion being deformed with a longitudinal rib therein extending inwardly from the end thereof and terminating at the transverse bend of said stirrup member. ,e

5. A steel joist construction, comprising a rolled beam section having a triangular portion cut from the end of its web, a stirrup member formed of a strip of plate material bent transversely at a point intermediate ofV its length to divide said stirrup into horizontal and angularly disposed sections, `'said angularly disposed section being deformed longitudinally into a U-shaped cross section into which the upwardly and outwardly sloping edge ofthe cut-out portion of the web exl tends with the sides of the U-portion. overlapping and snugly embracing the web and being permanently fixed to said web, said stirrup being welded at itstransverse bend to the top end edge of the beam and having ,p

its, horizontal portion Aprojecting therebeyond to form-a rigid support. y

6. A steeljoist construction, comprising aV rolled beam section having a triangular portion cut from'the end of its web, a'stirrup member formed of a strip of plate metal bent transversely intermediate of its length to form horizontal sloping sections, said slop-V ing sections being placed against-the upwardlyV and outwardly sloping edge of the cut-out portion of the web and having its sides flanged vover and intimately embracing the .web, said flanged sides being welded alongY 'bottom flange, the upper edge thereof being parallel with the flange, a stirrup member formed of a length of steel plate bent transversely at a point inwardly from one end to form a horizontal portion and a sloping portion, said sloping portion being fitted against the upwardly and outwardly sloping edge of the web of thebeam and having its sides bent inwardly to'snugly embrace the beam and welded along its edge extremities to the web surface of said beam, said stirrup being welded at its junction point between said horizontal and sloping portions to the end of the beam, said horizontal portion projecting beyond the weld at the beam end and being deformed to provide a reinforced extension for the beam to be .weldedto the main building structure.

8. In a building structure, the combination with thel main steel beam, of transverse beams arranged to form joists extending between the main beam, said transverse beams having their webs notched at the ends to form chaces to receive pipes and wires leaving the lower portion of the transverse beams intact to form a support for said pipes and wires, stirrup members rigidly welded to thewebs of said transverse beams andto the upper end edge of the top flange thereof and having reinforced extension ends projecting beyond ltjhe ends of the joists to rest upon the main eam.

ROBERT L. MCINTYRE.

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