US617615A - Concrete arch - Google Patents

Concrete arch Download PDF


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US617615A US617615DA US617615A US 617615 A US617615 A US 617615A US 617615D A US617615D A US 617615DA US 617615 A US617615 A US 617615A
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    • E04B7/08Vaulted roofs


Patented 1an. lo, |899.
(Application med oct. 1e, 189e.)
+.lll. l||l Y LVVENTOR.
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1N: Nonms Perris no, PHOTO-umn.. msmucfon. n, c.
srEcIFIoATIoN forming part of Letters Patent No. 617,615, dated January 1o, v11399.
Application led October 16, 1896. Serial No. 609,053. (No model.)
To all whom, it 71u03/ concern,.-
Beit known that I, EDWINv THACHER, a citizen of the United States, residing at Detroit, county of Vayne, State of Michigan, have invented a certain new and useful Improvement .in Concrete Arches; and I declare the following to be a full, clear, and exact de scription of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this speciflcation.
My invention relates to concrete arches for bridges or vault-covering or for spanning openi'n gs in building construction; and it has for its object au improved arch structure in which iron or steel bars are embedded in concrete near the outer and inner surfaces of the arch in such a manner as to assist the concrete in resisting the thrusts and bending moments to which the arch is subjected.
By my invention I provide, first, for an effective connection between the bars and the concrete, employing lugs, dowels, bolts, or rivets, which pass through the bars and project into the concrete, in which they are embedded, and thereby reinforce the adhesion between the metal and the concrete and prevent any end movement of the bar through the concrete, so that the'complete crushing or shearing of the concrete must take place before a separation can be effected; second, I employ bars of such a form that they can be readily and cheaply spliced if a greater length of bar is required than that which can be conveniently rolled or shipped; third, I provide bars that can be manufactured at a small cost and as a standard or stock article and can be readily bent when used to the curve of the arch into which they are to enter. Consequently they can be stored or shipped in straight form. generally I arrange the bars in pairs, which are usually disposed so that one of the pair rests vertically above the other member of the pair, although I do not consider this manner of disposing the bars as essential in all cases. T he bars act as the anges of beams to resist bending moments, whereas the shearing stresses, which are small, are taken by the concrete alone. In their normal condition the bars and the concrete act together,
In ordinary structures and' and the Work done by each depends on its moment of inertia and modulus of elasticity; butif the concrete is defective and has a tendency to crack the bars will greatly aid in resisting such tendency, and if a crack should take place the relation of the parts will be` changed and the bars will do thejwork of the concrete and prevent the falling of the structure.
In the drawings, Figure 1 represents in vertical longitudinal section one-half of a bridgearch. Fig. 2 is a cross-section at the lines C D of Fig. 1. Fig. 3 is a plan showing onefourth of an arch. Fig. 4 is an enlarged cross-section of a portion of the arch. Figs. 5 and 6 show small portions of two styles of bars.
Similar -numbers refer to similar parts throughout the figures.
The abutment l, rthe arch 2, and the spandrel-iilling 3 constitute the complete structure, in which et indicates the metal bars (iron or steel) embedded in the concrete near the lower face and the upper face thereof. These bars extend well in to the abutment or pier 1 and are provided with projections extending in either direction from the surface of the bars. The projections maybe produced either in the form of lugs made integral with the bars, as shown in Fig. 6, or in the form of dowels or rivets placed in and secured to the bar after it has been rolled. They should project far enough to give to the bara good hold on the concrete. For small structures, in which but few bars are required, I should prefer the form shown in Fig. 5, in which a dowel or rivet pin with upset heads are placed through holes in the bar. In larger structures, where many bars are required, I should prefer a specially-constructed bar like that shown in Fig. 6.
The use of the double bars enables me to not only bend them at the time they are required for use to any desired arc of a circle, but enables me to bend them so that the different members of each pair are differently arched, and, furthermore, it'enables me to completely embed the lowermost member of the pair before the uppermost member is placed, thereby securing an intimate contact between the bar and the concrete without requiring the great particularity of filling and IOO rainniing under that is necessary where a bent I-beam with extending Iianges is e1nployed and necessarily put in place before any of the concrete is filled in around it.
That I claim is- 1. The combination with abutments, and a concrete arch spanning the intervening space, of a series o'f metal bars, in pairs, one bar of each pair above the other, near the intrados and extrados of the arch, and extending Well into the abutlnents, each bar of a pair being independent of the other, substantiall y as described.
A2. The combination with abutments, and a solid concrete arch spanning the intervening space, of a series of metal bars in pairs one bar of each pair vertically above the other, near lthe intrados and extrados of the arch, and extending Well into the abutinents,
each bar of a pair being independent of the zo other, and each bar being ilat and provided with projections, substantially as described.
3.Y The combination with abutnients, and a concrete arch spanning the space between the abutments, of a series of metal bars in pairs, one bar of each pair above the other bar, near the extrados and intrados of the arch, each bar of the pair being independent of the other and one bar of each pair extending Well into the abutment, substantially as described.
In testimony whereof Isign this specification in the presence of two Witnesses.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5040921A (en) * 1989-10-13 1991-08-20 Torok Frank J Segmented tunnel system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5040921A (en) * 1989-10-13 1991-08-20 Torok Frank J Segmented tunnel system

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