US920448A - Portable mold for concrete culverts and bridges. - Google Patents

Description

.A. J. FISHER.

PORTABLE MOLD FOR CONCRETE GULVERTS AND BRIDGES. APPLICATION FILED AUG. 10. 1908.

920,448. v Patented May 4, 1909.

3 SHEETS-SHEET v1- A. J. FISHER. PORTABLE MOLD FOR CONCRETE GULVERTS AND BRIDGES. APPLIOATION FILED AUG. 10, 1908.

920,448. Patented May4, 1909.

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A, J. FISHER,

PORTABLE MOLD FOR CONCRETE GULVERTS AND BRIDGES.

APPLICATION FILED AUG. l0 1908.

Patented May 4, 1909.

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UNITE OFFICE.

ANDREW J. FISHER, OF BUDA, ILLINOIS, ASSIGNOR TO LOUIS H. SCOTT, OF PRINCETON,

' ILLINOIS.

PORTABLE M10111) FOR CONCRETE CULVERTS AND BRIDGES.

shoveled and tamped, and allowed to set and dry, after which the lumber forming the mold was knocked apart and removed. The

labor involved in erecting molds in this way and the waste of lumber it necessarily entailed have added greatly to the cost of erection of such culverts and bridges; and unless great skill and care was employed by the mold .constructors the finished culvert or bridge would not present the smooth, regular and attractive appearance desired.

My object is to provide an improved iron or steel knock-down mold for culverts or bridges, formed of members which may be readily attached to and detached from each 0 other, whereby the mold may be erected in desired position very quickly and at little expense for labor; result in producing a smooth and sightly concrete molded structure, and be easily removed without waste of parts, so that the mold may be readily transported and used over and over again. Referring to the drawings-Figure 1 is a sectional view of my improved culvert or bridge mold erected upon a concrete foun- 0 dation, the section being taken on line 1 in Fig. 2; Fig. 2, a View partly in section and partly in side elevation, the section being taken on line 2 in Fig. 1; Fig. 3, a plan-view of a concrete foundation; Fig. d, a top-plan 5 view of the mold and illustrating the manner of applying a strip of tar-paper, or the like, over the open joint at the top of the arch; Fig. 5, an enlarged vertical section of one of the end-molds, the section being taken on 0 line 5 in Fig. 6; Fig. 6, an enlarged fragmentary section taken on line 6 in Fig. 5; Fig. 7, a further enlarged fragmentary section of one of the said end-molds illustrating details of construction Fig. 8, a fragmentary section of the arch-form taken on line 8 in Specification of Letters Patent.

Application filed August 10, 1908.

Patented May 4, 1909.

Serial No. 447,707.

taken on line 10 in Fig. 9; and Fig. 11 a view similar to Fig. 6, but showing the manner of applying wing-molds to the end-molds.

The framework of the arch-form portion of the mold is formed of arch-bars 12 preferably T-shape in cross-section, each of which may, as shown, be segmental and extend approximately a quarter of a circle. These are provided with bolt-holes equidistant apart and similarly positioned in each of the bars. The ends of companion bars 12 are fastened together by means of segmental tie-plates 13 having elongated bolt-openings 14 to receive bolts 15 which pass through the said bars.

In constructing a bridge, or culvert, a foundation 16 of concrete is first laid and permitted to set and become more or less dry. The arch-bars 12, fastened together at their ends by means of the tie-plates 13, are then placed upon the foundation as indicated in Fig. 1, and arch-plates 17 ap roximating in length that of the segmenta bars are fastened at their edges to the bars by means of bolts. The bolt-holes provided in the plates are equi-distant apart and spaced to register with bolt-openings in opposite sides of the heads of the T-bars. The plates 17 are caused to abut and fit closely against each other at their side edges and are fastened to the bars 12 by means of bolts 18 which are formed with shallow round heads and held in place by nuts. As many archbars and plates are fastened together in position as may be required, and to relieve strain upon the tie-plates 13 and bolts, wedges 29 are driven between adjacent ends of companion arch-bars.

The end-molds are formed with outer walls 19 and inner walls 20 tapering toward each other as indicated, and end-walls 21, allconstructed as most clearly shown in Figs. 5, 6 and 7. The inner and outer walls are formed of horizontal plates 22 abutting together at their edges and there fastened together by horizontally extending channel-bars 23. The edge-portions of the plates and the channelbars are formed with co-incident bolt-openings, and bolts 24 having shallow rounded heads fasten the plates to the channel-bars The bolts are provided with removable nuts as indicated. The end-plates 21 are fastened in place by means of round headed bolts as indicated in Fig. 6. They are U- shaped in cross-section and taper longitudinally to give the desired inclinations to the inner and outer walls of the end mold. Each end-mold is open at the top, and its outer wall presents a. segmental cut-away portion leaving an arch or opening. The end archplates taper to. fit against the inner surfaces of said outer walls and carry angle-iron bars 25 which are bolted to the outer walls to fasten the arch and end molds together. The inner wall of each end-mold has a cut-away arch-portion 26 describing the segment of a circle somewhat larger than the built-up arch, leaving between them a space of approxii'nately the dimensions and shape of the intended concrete arch-portion of the culvert, or the like. When the end-molds are erected in proper position as described the mold structure is complete.

The concrete is poured into the top of each of the end-molds, or shoveled in and'tamped, and concrete is plastered over the arch-form to a thickness which will cause its outer surface to approximate the are 26. The moldends and arch-form are left in place until the molded concrete has set and become sufficiently dry.

The T-bars 12 and plates 17 do not abut at the to line of the arch, but are held slightly spaced apart by the tie-plates 13 and wedges 29, as most clearly indicated at Fig. 9. The opening 27 thus left may, before the molding operation begins, be covered with a strip 28 of tar paper, or the like, which will prevent the concrete running into the said space. The plate-joining bars 12, 23 and 25 besides strengthening the structure, batten the joints between plates and prevent their leaking.

The construction shownin Fig. 11 shows adjuncts applicable to the end-molds described, to enable the same molds to be emloyed for forming culverts, or the like, with inclined wing-extensions. In this case inner angle-plates 30 and outer angle-plates 31 are bolted to the ends of the plates 22, and inner and outer suitably shaped wing sideplates 32 are bolted, thereto, as shown. The endplates 21 instead of being fastened to the plates 22 are bolted to the outer edge-portions of the plates 32. hen it is desired to 'remove t 1e mold, the wedges 29 are knocked out and the bolts at the tie-plates 13 are loosened to cause the arch-portion of the mold to collapse slightly and free itself from the molded concrete arch. The plates and.

T-bars may then be unfastened from each other and taken out piece by piece, or, if de sired, after removing the wedges and. tieplates, the two longitudinal built-up members of the two-part arch form, may be removed bodily. The mold-ends may also be removed by taking out the bolts which fasten the members thereof together. In erecting molds for culverts for roads of different widths, it is only necessary to increase or diminish the number of the intermediate plates 17 and bars 12 employed. The said. intermediate plates 17 and arch-bars 1.2 being all constructed alike are interchangeable and easily placed in position. Concrcte culverts and bridges molded in my improved mold will always be perfect as to shape and proportion and. present smooth and sightly surfaces.

I am aware that it has been proposed to provide a mold constructed of a frame-work of lumber with flashings or shoulder molding parts, the inner or inside walls of which are spaced apart from and connected to the end. walls of the mold proper by bolts, but I am not aware that prior to my invention a knock-down metal mold has been provided with an end-mold. having a cutaway archportion describing the segment of a circle somewhat larger than the built-up arch, and leaving between them a space of approximately the dimensions and shape of such arch portion and through which opening the concrete extends when tamped into the hollow end mold and unites with the concrete forming the arch-portion.

While I prefer to construct my improved. mold of attachable and detachable members constructed as shown and described, naturally the construction may be variously modified in the matter of details without de arting from the spirit of my invention as cleaned by the claims.

What I claim as new, and desire to secure by Letters Patent, is-

1. A knock-down metal mold for concrete culverts, and the like, comprising in combination, a two-part arch-form each composed. of segmental bars, and plates curved to extend longitudinally of and to conform to the contour of said bars and removably fastened. at their side edges to the bars, and hollow end-molds fitting against said form and constructed of plates and bars removably fastened together and each provided. on its inner face with a cut-away arch portion, substantially as, and for the purpose set forth.

2. A knock-down metal mold for concrete culverts, and the like, comprising in combination, an arch-form composed. of a series of companion arch-bars removably secured together at their upper ends, arch-plates eX tending longitudinally of the said bars and removably fastened thereto at their lateral edges and hollow end-molds fitting against said form and constructed of plates and bars removably fastened together and each provided on its inner face with a cut-away arch portion, substantially as, and for the purpose set forth.

A knock-down metal mold for concrete culverts, and the like, comprising in combination, an arch-form composed of a series of companion arch-bars, tie-plates removably securing the companion bars together at their upper ends, arch-plates extending longitudinally of the said bars and removably fastened thereto at their lateral edges, and hollow end-molds fitting against said form and constructed of plates and bars removably fastened together and each provided on its inner face with a cut-away arch port-ion, substantially as, and for the purpose set forth.

4. A knock-down metal mold for concrete culverts, and the like, comprising in combination, an arch-form composed. of a series of companion arch-bars, tie-plates removahly securing the companion bars together at their ends in spaced relation, arch-plates extending longitudinally of said bars and removably fastened thereto at their lateral edges and extending slightly short of the top of the arch-form to leave a space, a coveringstrip for said space, and hollow end-molds fitting against said form and constructed of plates and bars removably fastened together and each provided on its inner face With a cut-away arch portion, for the purpose set forth.

5. A knock-down metal mold for concrete culverts, and the like, comprising in combination, an archform composed of a series of companion arch-bars, tie-plates removably securing the companion bars together at their ends in spaced relation, removable Wedges interposed between the ends of said comp anion bars, arch-plates extending longitudinally of said bars and removably fastened thereto at their lateral edges, and hollow end-molds fitting against said form and constructed of plates and bars removably fastened together and each provided on its inner face with a cut-away arch portion, for the purpose setforth.

ANDREW J. FISHER.

In presence of- O. F. Soo'r'r, M. E. NELSON.

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