US904977A - Tension-bar for concrete construction. - Google Patents

Description

G. S. MILES. TENSION BAR FOR CONCRETE CONSTRUCTION.

APPLICATION FILED MAY 27, 1907.

Patented Nov. 24, 1908.

WITNESSEE:

UNITED STATES PATENT OFFICE.

GEORGE S. MILES, OF NEW YORK, N. Y., ASSIGNOR TO OSCAR J. MAIGNE, OF NEW YORK, N. Y.

TENSION-BAR FOR CONCRETE CONSTRUCTION.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed may 27, 1907. Serial No. 376,001.

To (1Z1 whom "it may concern:

Be it known that I, Gnonen S. MILns, a resident of New York city, in the county of New York and State of New York, have invented a new and useful Improvement in Tension Bars for Concrete Construction; and i do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to combined concrete and metal constructions, and has special reference to what are known as tension bars in which the trussed members are formed of metal and the remaining portion of concrete or cement.

The object of my invention is to construct and arrange the metallic member within the body of cement that the plurality of minor or auxiliary members for forming the trusses with the main member are readily attached and rigidly secured to said main member in a cheap, simple and efiicient manner, so that the stresses developed within the former are directly carried into the latter.

My invention consists, generally stated, in the novel. arrangement, construction and combination of parts, as hereinafter more specifically set forth and described and particularly pointed out in the claims.

To enable others skilled in the art to con struct and use my improved combined concrete and metal construction, I will describe the same more fully, referring to the accompanying drawing, in which- Figure 1 is a side elevation of a beam embodying my invention. Fig. 2 is a crosssection of two of the bars employed. Fig. 3 is a plan view of said bars with the stirrups removed. Fig. 4 is a like view of the base or bridge bar. Figs. 5 and 6 are perspective views of two forms of stirrups. Fig. 6 is a detail view of another form of the base-bar. Fig. 7 is a perspective view of the connecting link. Fig; 8, is a side elevation of a trussed girder employing my invention.

Like symbols of reference herein indicate like parts in each of the figures of the drawis illustrated in Fig. 1 of the drawing 1 represents the body of concrete or other cement in rectangular form or shape and adapted for use as a beam. 'Within such body 1 is the metallic main member 2 which is formed from bars oi metal to substantially T-shape and composed of the tension bar 3 and bridge or base bar 4: under the same to form flanges 5 extending out from each side of the same beyond said bar Tl.

' Connected to the main member 2 is the plurality of metallic minor or auxiliary members (i which can be formed of wire rods or bars so that they may be bent for attaching to and extending up from the main member at an inclined position. These auxiliary members 5 are made to form for attachment to the main member 2 by bending through any suitable means the rods or bars into the loops 7, so that they will extend over the body or tension bar 53 of the member 2, as shown in Fig. 2, and then bending the ends of the same to form the hook portions 8 for engaging with the flanges 5 on the base bar 4, as shown in Figs. 1 and 2. The hook portions 8 on the members 6 are provided with the ogee or vertical curved portions 9 thereon which connect with the body 10 for forming the loops 7 and with the straight horizontal portions 11 at right angles to said portions 9, while connected to said portions 11 are the portions 12, which extend up vertically and at right angles to said portions 11 and which terminate with the end portions 13 extending at right anglestoward each other from said portions 12.

The base bar 4 of the main member 2 is provided with a series of sets of slotted holes or openings 14 which extend into said bar from the side edges thereof, and four of said openings form a set, with two on each side edge to form a pair. Each pair of said openings 14 in a set preferably extend in a more or less degree out of a right angle to the side edge of the bar 4 and dip toward each other as they point towards the center of the bar, so that. in attaching the auxiliary members 6 to said bar the attaching members or bent hooped portions 8 with the ends of the same bent up vertically from the portions 11 are inserted in each of the sets of said openings, which will permit the vertical portions 9 and 12 on said portions 8 to be seated in the pairs of said sets and with the straight portion 11 running longitudinally arallel with and in a lower plane than the ar. After this is accomplished the ends of the vertical portions 12am bent down onto 105 and across the tension bar 3. placed upon the the purpose of paralleling, spacing and holdsaid bars, as hereinbet'ore described, while which will hold the said bar 3 and members (5 lower edge of the body 1 and is slightly embareto form the portions 13 extending along- 1 side of each other and over the said bar 3,

in position, and if desired, the ends of the portions 13 can be bent down along the sides of the bar 3 so as to Wrap over said bar and form the hooks 13, as shown in Figs. 1 and 5, while it will also be evident that such portions 13 canextend under each other, as shown in Fig. 6. i

The loops 7 on the members 6 in forming the shear arms or stirrups are bent up to their proper inclined positions over and around the bar 3 of the main member 2 andsuch member is arranged adjacent to the bedded therein, as shown in 1 in forming the beam. The auxiliary members 6 incline upward oppositive upon opposite sides of the center of the beam so that the effect of this arrangement in the completed beam is that the tensile stresses developed in the auxiliary members 6 are communicated to the main member 2 directly, while the compression stresses intermediate of said members 6 are resisted by the concrete through the broken lines shown in Fig. 1.

It will be evident that one or a series of tension bars can be used in the single beam and in Figs. 1 and 2 two are shown as running parallel with each other, in which case the connecting link or bar 15 can be used for ing of said bars in line and at fixed inter vals, and thereby form a unitary structure. These links l5 extend across, between and under the members 2 and through the stirrup loop formed by the hook portions 8 on the members 6, which will. allow them to fit between the base bar a and the portions 11 on said portions 8. Slots 16 are formed in one side edge of the links 14 for fitting over or part way around the portions 9 of the stirrup loop formed by the hook portions 8 and the ends of the said links are bent down to form the legs 16' to hold the tension bars at a uniform level or distance above the bottom of the mold. These legs 16 can be made of any length desired or they can be left off entirely and the seats 16 in the links 15 can be made of any shape in order to conform to the shape of the material forming the stirrup loop, which loop or the entire member 6 can be made of various shapes of metal as desired, such as flat, square, and the round as shown.

In F 8 is shown my invention applied to a trussed girder, in which case there is the bottom tension bar or member 2 and a top bar 17 and these bars are connected by the diagonals or stirrups of the members 6, being fastened in the dipped slots in each of single wires or rods are used for the trusses sodas? such as T-bar, Lb'ar, T-rail, or an ordinary flat bar like the base bar, in which case, the hook ends on the auxiliary memberscan be bent over the same and be held thereon by various means such as the bending up of the metal between the holes in a set, andsuch metal can also be bent down toact as a leg to determine the height or level otthe bars above the bottom of the concrete.

t will also be evident that other forms and shapes of the auxiliary members can be used and that the attaching portion for the same can be changed or varied, as well as the holes for the same on the main member, as the metal at said oblique holes can be clenched over the stirrups, if desired, as shown by the projecting portion at 18 in Fig. 6 while it will be also evident that the base bar 4 can extend throughout the length of the bar 2, as shown, or can be made in shorter lengths to carry one or more of the members 6, secured in said holes, in which case these bars 4 and members 6 can be made as a commercial article, with the vertical portions 12 on the hook portions 8 6XteI1Cl ing up from the same, so that it can be packed and shipped for being used at the work by bending such portions12 over the bar 2 or any other form of bar, to form the securing end portions 13, the bar at in\ this case acting as a connecting bar, and various other changes in the positlon, design, shape, form and material of the various parts of both members may be resorted to Withdut departingifrom the spirit of the invention or sacrificing any of its advantages. It will thus be seen that in my improved tension bar for concrete construction a good bond will be given to the concrete and it Will throw or import all shearing strains directly on the tension bar and serves every purpose for which the combined strains on. the, tension bar and stirrups or diagonal demand,

with each part doing its full service ;'when in place and acting as if made from one piece. The manner of attachment also ac-. complishes the purposes of a firm tie or fastening and holds the tension bar firmly in place and in effect makes a complete combination, as one, of the tension bar and bridge or base.

It will also be seen that the common feature of all the various modifications above referred to for the construction of beams that a main metallic member is connected to a plurality of minor, supplemental or auxiliary metallic members, the latter mci'nbers being attached at one end to the main member and extending out obliquely therefrom into the cementitious body, while. in all these arrangements shown for such beam the main members correspond to the chords of a truss and the auxiliary members to the web thereof, so that the intention of the invention is to so space the metal within the concrete that each is stressed in the manner most advantageous to its special nature for which it is intended.

it. will be obvious that the inclined auxiliary members may be of varying lengths and that the end ones of such members may be of the greatest length, while the mid- -dle or intermediate lengths will. be the shortest and of gradually decreasing lengths or. vice versa.

It will also be obvious that two main members can be used in a beam in a separate and distinct manner from each other and held together in the same manner through the concrete which grips the protecting web members, so that. when the metallic truss is thus completed the concrete will perform the same function as the web in a plate or latticed girder, and in this arrangement it is not even necessary that the main members lie within the concrete at all, as the strain on them depends largely on the pull brought. into them by the inclined members.

it will further be obvious that the auxiliary members can lie in the opposite di rcction from that shown in Fig. 1 and that various other :t'orms and shapes oil the main members can be used in the making of beams, columns. slabs, arches, girders, etc.

hat I claim as my invention and desire to secure by Letters Patent, is-

l. The combination with a cen'icntitious or other body, of a metallic member extending longitudinally thereof, and stirrupshaving portions connected to said longitudinal member, said portions being arranged longitudinally parallel with and in a lower plane than said member and carried transversely over the said member.

2. The combination with a ccmcnlitious or other body. of a metallic member extending longitudimilly thereof, and stirrupshaving attaching portions connected to said longitudinal member through slots in said incinlztl'. said portions being arranged longitu dinally parallel with and in a lower plane than said member and the 'lrco ends of the said attaching portions carried transversely ver the said member.

I). The combination with a ccn'ientilious or other body, of a metallic member extending longitudinally thereof, a connecting on base bar under said member, and stirrups having attaching portions fastened to said bar, said portions connected to said member by beingarranged longitudinally parallel with and in a lower plane than the base bar and the tree endsof the said attaching portions carried transversely over said bar and said member.

at. The combination with a cementitious or other body, of a metallic member extending longitudinally thereof, a connecting or base bar under said member, and stirrups having attaching portions carried along said bar and connected to said bar through slots in the same, said stirrups having portions arranged longitudinally parallel with arid in a lower plane than said member and the free ends of said attaching portions carried transversely over said bar and said member.

5. The combination with a cementitious or other body, of metallic members extending longitudinally thereof having a series of slots in each side, attaching portions connected to said longitudinal members through said slots and having parts arranged parallel with and in a lower plane than said longitudinalmembers and the free ends of said attaching portions carried transversely over said members, and a connecting bar extending across and between said longitudinal mcm rs and connected thereto through said attrcl-ing portions.

6. Thc combination with a cementitious or other bod ol metallic members extending longitiulinally th. reo'l'. slirrups having attaching portions connected to said longitudinal mcuibcrs and parallel with and in a lower plane than said longitudinal members and the ends ol said attaching portions car- .ri d transversely over said members. and a connecting bar extending across and betwcen said longitudinal members and connected thereto through the portions of said st irrups.

7 The combination with a cementilious or other body, ol' metallic members extending longitudinally thercot'. slirrups having attaching portions connected to said longitudinal members and parallel with and in a lower plane than said longitudinal members and the free ends of said attaching portions carried transversely over the said members. a connecting bar cxtcmling across and between said longiludinal members and connected thereto through said attaching portions, and means on the cnds'o'l said bar for determining the distance said longitudinal members are held above the bottom ol the mold.

The combination with av comentitious or other body, ol a metallic member exlcnd ing longitudii'ially thereof, stirrups having attaching portions connected to said member through slots in said member and said portions being arranged longitudinally parallel with and in a lower plane than said member and the free ends of said attaching portions carried transversely over the said member, and means for holding said attaching portions in place Within said slots.

seam? In testimony whereof, I,- the said GEORG l MILES, nave hereunto set my hand.

. GEORGE S. MILES.

Witnesses: V

NATHAN SCHAUMBURGER, MORTON sCI-IAUMBURGER.

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