US2049263A - Structural element - Google Patents

Description

J. JONES July 28, 1936.

S TRUCTURAL ELEMENT 2 Sheets-Sheet l Filed March 25, 1953 Hu h. HHHH iTQ T Hurt-i1? wag 9Q J. JONES July 28, 1936.

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Patented July 28, 1936 QFFEQE STRUCTURAL ELEMENT Jonathan Jones, Bethlehem, Pa., assignor to McClintic-Marshall Corporation, a corporation of Pennsylvania Application March 25, 1933,'Serial No. 662,741

'7 Claims.

This invention relates to structural elements,

especially to a type of knockedown plate girder or beam designed for use where room for assembly is'limited and where the pieces to be handled in making up-the girder or beam must be relatively compact and light.

-Frequently, where knock-down plate girders are used, it is desirable to progress by removing rear portions from such a girder and rebuilding these same portions on in front in a repetitive series It is a particular object of my invention to provide a knock-down plate girder in which the parts that make up the girder are interchangeable end-for-end, and this in such a manner that assembly and disassembly of the girder may be accomplished with a minimum of effort and of required space. V

Heretofore knock-down plate girders have been used wherein in the assembled girder the continuity of the web plate was discontinued at various places and no means were provided whereby the shear value of the web plate at such places was restored. This construction resulted in a serious defect, in that the web plate, and therefore the girder as a whole, was not of equal shear strength throughout its length and could easily be crippled by some fortuitous arrangement of loading and supports which would be perfectly natural to the user, but critical as to the web action. It is another object of my invention to provide a knock-down plate girder in which the value of the web plate for resisting shear is partially or wholly (as may be elected) restored at all points where the continuity of the web plate is interrupted by reason of its knock-down require ments. 1

In a like manner the angles used'to reinforce the web plate heretofore have been used without restoring the shear value at the points of intermeans of novel features which will be more fully understood from the following description and claims taken with the drawings in which:

Fig. 1 is a front elevation of a girder constructed in accordance with my invention;

Fig. 2 is a tranverse section taken along the line 2--2 of Fig. 1;

Fig. -3 is a transverse section taken along the line 3-3 of Fig. 1;

Fig. 4 is a transverse section taken along the line 4--4 of Fig. 1;

Fig. 5 is an enlarged fragmentary section taken along the line 55 of Fig. 1;

Fig. 6 is an enlarged fragmentary section of a modification to the embodiment of my invention shown in Figs. 1 and 5;

Fig. '7 is a front elevation of another modification to the embodiment shown in Fig. 1; and

Fig. 8 is atransverse section taken along the line S8 of Fig. 7.

As illustrated in the accompanying drawings the numeral i designates a kncck-down plate girder embodying a preferred form of my invention provided with a series of web plates l I placed in overlapping relation at their ends, as at 12 and E3. The-web plates H are demountably united at the laps'by demountable fastening devices M. Alongthe outer edge of each web plate and on that side whereon the next adjacent web plates (or plate if at girder end) overlap are filler plates 55. The filler plates 15 are made the same thickness as the web plates with the result that, with the filler plates l in place, the assembled web plates along their edges on both sides are flush from one end to the other. An appreciable gap or clearance is preferably left between the ends of the filler plates l5 and the ends of the adjacent web plates H, as at I6. Thisgap or clearance makes for a saving of cost in manufacture and for subsequent ease in assembly and disassembly. As afurther convenience in assembly and disassembly the filler plates l5 may be tack welded in place on the web plates H, though this is not a necessity. It should also be noted that the filler plates l5 by reason of the overlapping arrangement of the web plates ll occur alternately on opposite sides of the girder on each successive web plate. Along each outer edge and on the opposite sides thereof of the assembled web plates I i and the filler plates I?) are a series of reinforcing angles 51. The angles H are placed end to end are in length preferably twice that of the center distance between successive web plates, which permits preferably of arranging the meeting ends of the angles I7 so as to always occur midway of the ends of a web plate H as at 48 and preferably always on the same side with the filler plates I5 for that particular web plate. As indicated at 58 an appreciable gap or clearance is preferably allowed between the ends of angles H for ease of manufacture and subsequent ease of assembly and disassembly. Splice bars I9 are placed to overlap the vertical outside faces of the adjacent ends of the angles ll. Suitable demountable fastening devices 20, 2|, and 22 secure the angles l1, splice bars 19, and filler plates l5 to'theassembled web plates ll and make therewith a temporary integral unit.

It will be realized that the spacing of the various fastening devices I 4, 20, 2|, and 22 and the necessary adaptation therefor of the associated parts ll, I5, [1, and I9 will be standardized so thatthe said associated parts will be interchangeable one with another in their appointed places. 0

In Fig. 6 I show a modification of my above described invention in which the splice bar l9 has an outstanding leg in contact with the adjacent outstanding legs of the angles l1, and is demountably attached thereto by'meansof suitable fastening devices 23. a

It will be seen from the above description that I have provided a knock-down plate girder which is particularly adapted for use in cramped areas where it is desired to advance the work for which the girder is being used by removing the demountable parts from the rear part of the girder and rebuilding the same partsto-thefront part of the girder in a repetitive series of moves.

However, there may be occasions where this the end web plate ll. Also I supply a filler plate 26 which takes the place of what would normally I be the lapped-over end'of the next adjacent web plate. The filler plate 26 and theends of the special angles 2 3 and 25 are demountably united with the webplate l l by means of the demountablefastening devices l4 and 2| hereinbefore described.

From the foregoing description it will be seen that I have devised a knock-down web plate glrder of approximately uniform resistance to shear throughout its length. N This I secure by overlapping the adjoining ends of multiple webplates and by splicing successivereinforcing angles by means of filler plates and splice barsin such a manner that I restore to the assembled girder partially or wholly (asmay be elected) the shear value that would'otherwise be lost due to the break-in thecontinuity of the web plates'and the reinforcing angles. At the same time. I have devised a knock-down web plate girder which is;

simple and compact of design, economical in cost of manufacture, andadapted to be conveniently manipulated in difilcult places of assembly and disassembly.

.While I have shown my invention in certain preferred forms, it will be obvious to those skilled in the art that is is not so limited, but is suseceptible of various other changes and modifications without departing from the spirit thereof,

and I desire, therefore, that: only suchlimitations' shall be placed thereupon as are imposed by the prior art or as'are specificallyset forth in the appended claims.

. Having thus described.- what I claim as; new" and desire to secure by Letters Patent is:'

1. A structural element comprising a series of plate members joined in an end-to-end overlapping relation, the lapped plates. being arranged alternately in two parallel planes, fastening means at the lapped joints, fillerplates along the longitudinal edges of each plateand in the same plane as the next adjacent plate, a series of chord members in an end-to-end-relation along the' longitudinal edges of the'platemembers, splice members, disposed in: overlapping relation with the ends of the chord members, and'means. joining the chord members, the-filler plates, thesplioe members, and the plate. members.

. 2-. Astr-uctural element; comprising; a. series of plate members arranged in overlapping relation,

the plates being arranged alternately in two parallel planes, fastening means at the lapped joints, filler plates along the longitudinal edges of each plateand in thesame plane as the-next adjacent plate, aseries of chord members in anend-to-end, 7 relation along the longitudinal edges of the plate members, said chord members having a length approximately twice that of the plate members and so arranged that the end-to-end relation occurs at. and" on the filler plate side of a-p1ate member; splice members disposed in an overlapping relationwith the ends of the chord members, and means joining the chord members, the

filler plates, the splice members, and the plate members.

3.. A structuralielement comprising a series of,

plate members arranged inoVerIapping relation,

' the plates being arranged alternately in two par-. allel planes, fastening means at the lapped joints,

filler plates along the longitudinal edges of each.

plate and in the sameplane as the next adjacent plate, a series of chordmembers in an end;

to-end relation along the longitudinal' edges of the plate members, said chord members having; a

length such that the end-to-end relation occurs at and on they filler plate side of a platemember, splicemem-bers in an overlapping relation with the ends of the chord members, and means joining, the chord-members, the filler plates, thesplice;

members, and the plate members.

4. A structural element comprising: aseries of platemembers joined in an overlappingrelation,

the lapped plates being. arranged alternately in two parallel planes, fastening. means. at" the lapped joints, filler platesv tack. Welded. in: place.

along the longitudinal edges of each plate and disposed in the same plane as the next adjacent.

plate, a series of chordni'embersinan end-toend relation along the longitudinal edgesof the plate memberssplice members disposed in an overlappingrelationwith the ends of the chord members,

and means securingthe chord members, the-splice members, the plate membersandf the filler plate members together;

5. A structural element comprising a seriespf plate members joined in.an overlapping re'lation,

the lapped plates being arranged. alternatelyin two parallel planes, fastening means at, the;

lappedjoints, filler 7 plates along: the longitudinal edges of each plate and in-the same plane. as.

the nextadjacent plate,. a series. of. chord 'angle members in an end tO-end relation alongthe longitudinal edges of the plate ,members, splice angle members disposed in-an overlapping rela tionwith the ends of the chord angle-members; means joining the chord: angle members the splice angle members, and the filler plates to the angle. members to the chord angle members.

plate members, and means joining the; splice 6. A- structural element comprising a plurality;

tion, means securing the adjacent ends of said of web plates having ,ends in "overlapping rela plates, chordmembers SGCllI'flditO the web plates;

and: filler members intermediate the web plates and the chord members. 7

7.. A structural element comprising'a plurality of web plates having ends in overlappinggrelation,, means securingv the adjacent ends of said 7 plates, chord members secured to the webplates,

filler members intermediate the-webplates and the chord members, and means-joining said' chord members,

JONATHAN: J QNES.

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