US1617200A - Fabricated latticed girder - Google Patents

Description

Feb; 8 1927. 1,617,200

w. c. CORYELL ET AL FABRICATED LATTICED GIRDER Filed owe, 1925 v 'zsh heet 1 WC. orge ll,

W. C CORYELL ET AL FABRICATED LATTICED GIRDER Feb. 8 9 1927 1,617,209

Filed Oct. 6, 1923 2 Sheets-Sheet 2 g n'fou W C. Goryell,

W/TNEssEs:

Patented Feb. 8, 1927.

UNITED STATES 1,617,206 PATENT OFFICE.

WILLIAM C. CORYELL AND CLARENCE W, NOBLE, OF YOUNGSTOWN, OHIO, ASSIGNORS,

BY MESNE ASSIGNMENTS, TO TRUSCON STEEL COMPANY, OF YOUNGSTOWN; OHIO,

A CORPORATION OF MICHIGAN.

FABRIOATED LATTICED G IRDER.

This invention relates to girders for building construction and the like, and more particularly to an improved type of latticed girder which is fabricated from standard rolled sections A primary object of the invention is to provide a girder or truss construction consisting of tension and compression chord members which may be fabricatedin long lengths that may be subsequently cut, bent and otherwise prepared to suittherequirements of the particular job after reaching the distant warehouse or job site. That is tosay, the inventioncontemplates the provision of agirder construction comprising chord andtruss members which for a given sized'girder, will all bemade in standard 1 long lengths, adapted for one or two car with this practice not only minimize mill length shipments, and which can be later sub-divided at the distant'warehouse or constructi'on location to suit special require ments. Girders manufactured in accordance operations and handling, but also the cost of shipping and the liability of danger in making errors is reduced to a minimum by eliminatingthe great number of modifications which are otherwise required in the main fabricating plant.

Another object of the invention is to provide the girder construction havinggreat load carrying capacity'and strength dueto the fact that the bottom chord is bent diagonally upward at its end to meet the top chord in such a way that theends of both chords may be securely connected in a novel and practical manner at the point of support.- v

A further object of the inventlon is to provide a fabricated girder or truss con-, struction having means for anchoring the same in the concrete in such a way as to form relatively Figure 1 is a detail side elevation of a portion of a fabricated girder construction in accordance with the present invention.

a Figure 2 is a vertical sectional view taken on the line 22 of Figure 1. I

Figure 3 is a vertical sectional view taken on the line 33 of Figure 1.

Figure 4 is a more or less diagrammatic view illustrating the manner in which a girder of the desired length can be made.

Figure 5 is a sidefelevation of a completed girder. g

Figure 6 is a detail sectional view" of the bottom chord member before the said edges thereof are crimped inwardly.

- Similarreference characters designate corresponding parts throughout the several figures of the drawings.

In addition to the advantages heretofore pointed out, namely, that of minimizing manufacturing operations" and the facility with which the parts of the girder may be handled, a girder constructed in accordance with the present invention has theadditional advantageof being very much cheaper than girders or beams of the solid web type because rolled steel sections of theheavy type are very much cheaper per ton of steel than are the thin strips which are largely used in the construction of the solid web type of metal lumber. Also a. beam of the fabricated type offers much less surface for exposure to the atmosphere than does a piece of steel lumber of equal strength and therefore in that type of beam there is a less percentage of material lost due to rust;

Referring more "particularly tothe novel features of the present-girder construction it will beobserved that the same essentially includes in its organization the top and bottom members'Afau'd B,an 'end coupling or filler O, and a suitable truss arrangement designated generally as D for connecting the top and bottom members between'the ends. The top member A constitutes the compression chord and: the bottom member B constitutes the tension chord, both of said mem bers being of channel cross section, and preferably, although not necessarily, made from.

the same set of rolls.

As shown in Figure 7 p p chord members and .B are provided on their adjacent sides with the flanges 1 wh ch deep recesses" or channels 9 2 the top and bottomat the inner sides of the members, while the opposite faces may be provided with the offset ribs 3 which provide relatively shal-w low recesses or channels 4 at the outside faces. In connection with the ribs 3 of the upper member or top chord A it is pointed out that these ribs serve to support the metal lathing or other reinforcement a sufficient distance from the main part of the top chord so as to permit the concrete to readily flow underneath the lath or reinforcement and till the channel or recess 4. Thus, in addition to these ribs serving as a good bearing surface for the reinforcement, they also serve to provide-a key for the concrete which will prevent the beam or girder from slipping or shifting laterally or in a sidewise direction. a

For the purpose of connecting the top and bottom chord members. A and B at the point of support the bottom chord B is bent upwardly at an angle as indicated at B, while the extreme end or tip 13 is bent parallel to the top chord A so as to permit of uniting the ends of the top and bottom members by the rolled coupling or filler blockC. This ll'OCk is preferably of H-shape'cross section and consists of the horizontal web portion 5 and the outer vertical walls 6 whichcooperate with the. horizontal web'to provide sockets for receiving the flanges 1--1 of :the top and bottom chord'skas shown in Figure 2. The walls 6. -6' are preferably a little narrower than the flanges 1 so that when the ends of themembers are clamped togethera welding pocket wp-may be formed; and to enabl'e the filler blocktorigidly and securely unite the ends of the chord members the u per and loweredge'sof the walls 6 may e.

fillet welded as indicated at w to the chords thereby providing a rigid and secure union for the top and bottom members of the girder. -This construction is well adapted for taking care of the horizontal shear at theen'ds of the beam. f

The diagonal or lattice construction D maybe of any well known and standardtype such for example 'as theWarren'truss' type as shown in the present drawings, or

it consist of verticalsa'nd diagonals-of the type kn wn as the Howe or Pratt trusses. In the type of truss shown in the drawings the diagonal bar members? preferably run in the form of a continuous let- I ter W'and'areprovided on their; side edges with relatively short projections or Ingeswhich, are irregular. as to spacing and as to size'an'd serve to act as shearing members against. the tension or compression which may be brought-to the top or bottom chord by the diagonal member. No instance has been found which requires that these lugs be of precise size or location. This is especially of great importance in rollin mill practice,

for while the lugs can be ma e of a uniform spacing of the lugs will become less and less It will also happen that one roll may wear fasten than the other of the same pair and therefore the spacing 1n one roll Wlll not keep step with the spacing in the other roll. 'lheret'ormdue' to continual Wear on the rolls. and other conditions in rolling mill practice-,the distance between the lugs becomes shorter and eventually new pockets I must be machined in 'the' rolls so as to permi-t proper spacing. Because of these difliculties in spacing the lugs 8-, it. has been found that they should be located at irregular intervals and that the relative positions of the lugs on the opposite faces'of the diagonals 7 may be left to the accidentof how the rolls happen to be placed at the time of attaching the spindle to the roll neck.

1 Referring further tothe diagonals 7 of the truss D it will be observed that the relatively horizontal portions 9 thereof lie within the relatively deep channels or recesses 2 at thei-nsi-de' faces of the chords A and B,

and are interlocked with the flanges 1 by crimping down the edges or lips of the flanges 1 as indicated at 10 thereby pro viding an. adequatejo'int between the ,di-' agonal 7 of the truss and the top andbottom chords of the girder.

' From the foregoing it will be apparent that the present invention makes it possible to provide a girder comprising only two or three rolled sections-, and which may be easily standardized into a product of great uniformity and simplicity of construction,- requiring no modification from one contin'uous'girder' to another. That is to say,

' the top and bottom chords A and B as well as the filler block 6 and diagonals 13 may be made in standard lengths and kept storage until required for a particular. job. At that .time 'long sections are taken from the warehouse and fabricated in accordance with the detail specifications which are prepared for the particular job. These specifications may not be muchmore than a expression of the length and de th of the finished girder, and are, there ore, easily comprehended by workmengwho become specialized and highly e'ili'cient knowinghow to prepare the sections" due to-tl resimplicity of the instruction, After'thetop chm-d has been measured and cut to the required length, the bottom-chord will be cut to a greater length than the finished length of the beam. by an amount determined upon by laying out the chord correctlyfor' the offset bends which are to be made at the ends.

(Note lines S-S, Fig. 4.) The diagonal members will then be cut and bent in ac cordance with predetermined calculations. and then the parts may be assembled into girder formation.

In connection with the novel end construction for uniting the top and bottom chords of the beam, and the diagonal lattice bar 7, it is pointed out that the upwardly bent portion B of the bottom chord, together with the top chord and adjacent diagonal 7 constitute a triangular panel at the ends of the girder which is of great strength and load carrying capacity.

Without further description it is thought that the features and advantages of the in- \ention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention and scope of the appended claims.

We claim:

1. A girder consisting of top and'bottom chords spaced in parallel relation throughout the major portion of their length, a web forming truss member arranged between and attached to the parallel portions of said chords, one end of one chord being deflected from a point adjacent the terminal of said truss member toward the end of the other chord and united thereto.

2. In combination, a body of concrete and a girder, the latter provided with a groove in its top chord and supporting the former, a key extension of the concrete entering said groove to prevent lateral movement of the girder, relative to the concrete, and web members connecting the chords.

3. A latticed girder construction consisting of top and bottom connected chord members, the top chord member being straight longitudinally throughout its length, and the ends of the bottom chord member being .ofl'set towards the top chord, and a filler block rigidly joining the ends of the chord members and adapted to carry longitudinal shear.

4. A latticed girder construction consisting of rolled top and bottom chord members, and a zigzag panel member attached to the chords by crimping thereon the flanges of the bottom'chord members, the end of said girder being produced by an offset in the bottom chord, and said chords being united at their ends by a welded joint. 7

5. In combination, a body of concrete, a

girder including top and bottom chords formed with grooves of difi'erent depth in opposite faces,'a key extensionof the concrete entering the top groove of the top chord to prevent lateral movement of the girder relative to the concrete, and web members connecting the chords.

6. In combination, a. body of concrete, and a girder including top and bottom chord members formed with grooves of different depth in opposite faces andassembled so that the deepest grooves are arranged'at adjacent faces of the members while the shallow groove of the upper bar forms a channel to receive a key extension of the concrete to prevent lateral movement of the girder, and truss members having portions lying within the relatively deep grooves at the adjacent faces of the chord members and inter-. locked with the flanges forming the edges of said grooves.

7 Incombination, a body of concrete, and a bullt-up girder construction including top and bottom chord members provided with flanges on their top and bottom faces and also provided with other flanges on their inner faces, trussing means interlocked with the flanges on the inner faces and the flanges on the outer face of the top chord being adapted to engage a key extension, of the concrete to prevent lateral movement of the girder.

8.'A girder end-construction including rolled channel sections'for the top and bottom, chord members, the end portion of the bottom chord member being deflected upwardly in proximity to the top chord memher, and rolled H-sections fitting between the ends of the chord members and secured thereto.

9. A girder end-construction including rolled channel sections" for thetop and bottom chord members, the end portion of the bottom chord member being deflected upwardly in proximity to the top chord mem her, and rolled H-sec tions fitting between the ends ofthe chord members and welded thereto.

Intestimony whereof we hereunto aflix oursignatures.

WILLIAM C. CORYELL. CLARENCE W. NOBLE;

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