US1594505A - Trussed girder - Google Patents

Description

1.1.1" ijle Vmi Patented Aug. 3, 1926.l

UNITED sTA' I E s ,.Ql'fi 1,594,505 PATENT'OFFICEQ? LEWIS A. FRYE, OF LOS ANGELES, CLIFRNIA.

This invention relates to a trussed girder and more particularly to a continuous trussed girder; and an object of the invention 1s to provide a continuous trussed girder structure which is particularly strong and rigid for its size and Weight yet simple and inexpensive. y

The invention is particularly applicable to structures-for suspended or elevated railway Systems altl'iough it will be understood that it is not in any way restricted to such specific application. In the `present disclosure of the invention it is applied to a structure for carrying a rail adapted to carry suspended monorail cars.

A particular feature of the invention 1s the manner in which the sections, or girders, are connected and trussed so that they are exceptionally strong and rigid. The strength and rigidity obtained by the present invention are particularly advantageous for structures of the character above specified.

Other objects and features of the inven`- tion will be best understood from the follow ing detailed description of a preferred ernbodiment of the invention throughout which reference is had to the accompanying drawings, in Which- M H i Y.

` Fig. 1 is a side elevation of a trussed girder as provided by the present invention; Fig. 2 is an enlarged `side elevation of a portion of the girder showing the manner inywhich the truss rods are spaced from the girder; Fig. 3 is an enlarged detailedsectional view taken as` indicated by line 3--3 on Fig. 1; Fig.A 4 is a detailed sectional view taken as indicated by line 4-4 on Fig. 3; and Fig.L 5 is a side elevation of the parts shown in Figs. 3 and 4 being a View taken as indicated by line 5- -5 on Fig. 4. i

Throughout the drawings numerals 10 designate I beams arranged end to end and tied, or connected, together vby channels 11 and angles or channels 12. The I beams 10 may be, and preferably are, standard I beams and have a plate 13 riveted or otherwise suitably secured to their upper flanges 14. The plate 13 forms a member or base on whichv tomount the cup, or U-shaped, rail 15 and also strengthens the structure laterally Awhen it is madepcomparatively wide as shown in the drawings.

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Application led May 18, 1920,`Seria1 No. 382,448. Renewed n.`I1`1ne' 11, 1923..v

relative, to uiefingaaidinai axis of the I beams 10, and are arranged so that their webs 16 engageorseat against the webs 17 of the I beams, andso that they are between the flanges 14 and 18 l of the I'beams. "The manner in which the `channels 11 are arranged in connection `with theI beams 10ji`s clearly illustrated in Figs. 4 and `5 of the drawings. It lwill be noted in these figures of the drawings that thechannel 11 lis secured to each of the' abutting beams 10 by rivets 2O `thereby positively and securely connecting them. It will be understood, of course, that any suitablevnumber of rivets 2O may be employed to connect the I beams'and channels 11 in orderto make the connection 17 of beams 10,- andare spaced somewhat apart so that the web 22 of supporting beam 23 will fit between their adj acentfianges 24, as shown in Fig. 4. LThe particularsupport'- ing beams23 herein shown, are comparatively large, or heavy, horizontally disposedI beams, but it will be understood that the invention is lnot in any way limited to any one specific form of supporting members. The flanges 24 and web 22'areconnectedftogether by suitable rivets 25 therebymaking the two channels 12 practically a Asolid orI continuous member. Thew'ebs 21`of the channel members 12 are secured to the webs 17 of I beams 10 by rivets'20, as clearly, shown in Figs. 3 and 4, thereby causing the` two channel members 12, or the -structur'eformed by the two channel members 12, to co-opera`te with the channel 11 in tying or connecting theI beams 10 together. `The I beams 10, being thus tied or lsecured together by the channels 11 and channels 12, form a continuous structure having' apoint of support at each beamconnection. i yk"` y To reinforce, 0r truss, ther structure formed by the Ibeams 1() to make it strong and rigid, truss rods 27 are arranged between thefianges 28 of adjacent channels 11 and between` adjacent fianges29 of channels 12. This arrangement of truss rods 27 causes each I beam 10 to be trussed by two rods. The truss rods 27 Yin connection with each I beam 10 each extend over two spacers or struts 30 which extend downwardly from the flange 18 of the beam as clearly shown in Figs. 1, 2 and 3. The struts 30 are each arranged 'from the ends of the beam at a distance equal toapproximately one third of the totallength of the beam. Each strut 30y comprises a wooden block 31, secured to the flange 18y by suitable angle irons 433, as clearly shown in the drawings, and a plate or saddle V34 mounted onthe outer end of the block 31. The saddle 34 has hooks 35 formed at opposite'sides to` carrythe truss rods`27, las clearly shown in Figs. 2 and 3.

The ends of the truss rods 27 extend through the flanges 28 and the flanges 29 and carry nuts 36. Suitable wedge shaped washers 37 are arranged under. thef nuts 36, which are on the rods that extend through flanges 28', so that the nuts willhave a flatk suitably disposed surface on which to seat. yThe :washers 37k are shaped to compensate for the angularity at whichA the rods 27 extend through the flanges 28, caused by the arrangement of the rods over the spacers 30, and valso the angularity ofthe inner faces 38 of flanges 28. Suitable wedge shaped washers 39 are arranged under the nuts 36, 4on the rods which extendthrough flanges 29 so that the nuts will have a flat suitably disposed surface on which to seat. In the constructions shown inthe drawings the channels 12 are formed of even thickness throughout so that the washers 37 need only compensate for the angularity at which the rods 27 extend through the flanges 29. y

A turn buckle 40 is arrangedfin each truss rod- 27, intermediate of its two ends so that it can be tightened or put under tension. When the truss rods 27 are put lunder tension they tend to draw the channels'll together and to `draw the channels 12 t6- gether thereby causing the I beams 10 to Abe put under compression, or in other words, causing the beams 10 to become compression members. When a load comes upon an I beam- 10 at any point, or points, between its two ends, the beam tends to flex or'bend downwardly and thereby causes increased tension to come upon rods 27 which thereupon cause increased compression .to come upon the I beam 10 greatly increasing its ability to resist the forces acting upon it. In practice, when the truss rods 27 are under the propery tension, a load, or pressure,`upon the beam 10 will cause practically no fiexure or bending of it. f

The truss rods 27 of adjacent I beams 10 are vsecured or tied togetherV by the channels 11 andthe channels or angles `12thereby causing the truss rods tobe practically continuous, and causing stra-in to be transferred between adjacent truss rods through the channels 11 or the channels 12. Further, part of the strains in the truss rods, supporting any one particular I beam, are also "transmitted to the adjacent beams through the channelsy 11 and channels 12 Adue to the channels being secured to the The strains or forces in any one beams. I beam10 vand its truss rods 27, are partially transmitted or ydistributed to adjacent I beams and truss rods thereby preventing concentration of strains on any one member or section yof lthe structure. In other words, the construction is continuous and suchl that aiload on any one particular I beam sets up forces in vthat I beam which are distributed through the entire structure and particularly into the adjacent 'I' beam and their truss rods. n A j It will be noted in the drawings that the saddles 34 and blocks 35, which carry the truss rods, are spaced considerable distance apart, infact, sothat they'are outward of lthe outer edges of the flanges 18. Further, the flanges 28 and 29 are comparatively short and do not 'extend outwardly beyond the flanges 14 and 18. The flanges l28 and 29 being short cause the ends of the truss rods to be secured close vto theweb 17 of beams 10, while the hooks 35 being spaced both downwardly yand'outwardly from the beamy cause the middle portions of thetruss rods to` be both below and outwardly from the beams. As has beenjbefore stated the truss rods bybeing arrangedbelow the beams strengthens them against downward flexure or bending; lin a likevmanner the arrangement of the truss rods outwardly from the beams greatly strengthens them against lateral flexure or bending. With the arrangement of truss rods just described the ends of the truss rods are not only arranged close tothe webs117 but arealso arranged close to,or immediately below the-flanges 14. The arrangement of the vends of the rods close to the flanges 14 causes the forces, from the truss rods ytending to compress the beams to be applied directly to the upper portions of the vbeams where they are most effective. l f i I-Iaving set forth a preferred embodiment of my invention-I do not wish to limit myself to the specific details hereinabove set forth but wish to reserve to myself any changes or variations y,that may appear'to those skilled in the art or that may fall within the scope of the following'claim.

Having described av preferredl form of my invention, I claim In combination, a plurality bers tothe support membersand also connecting the opposed ends of adjacent beam members at top and bottom in a manner of beam members 4meeting end to end, lsupport members to form a continuous beam, vertical flanges cured to the flanges of the connecting memon the connecting members and which extend bers at points above the neutral axis of the laterally from the side faces thereof, and beam. 10 a truss member associated with each beam In Witness that I claim the foregoing I 6 membera each truss memlmn extending below have hereunto subscribed my name this 4th its associated beam member between the supday of May 1920. porting members and being terminally se- LEWIS A. FRYE.

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