US2052446A - Mold for reenforced concrete stadiums - Google Patents

Description

Aug. 25, 1936. w. A. CANNON 2,052,445

4 l MOLD FR REENFAORCED CONCRETE-S'1VADIUMS Filed July'le, 1934 Patented Aug. 25, 1936 gaat Auitrit-:D STATES TENT OFFICE MOLD Foa REENFoRcEuVooNeRETE sTAmUMs, v

Will Alban Cannon, Niagara Falls, N. Y.

Application July 19, 41934, serial No. 736,199 1 claim. (c1. 25;-1187) This invention relates to certain new and useful improvements in molds for reenforced concrete stadiums, and of the general character disclosed in the patent granted to Will Alban Cannon on July 3, 1934, Patent Number 1,965,486.

The present invention has particular reference to-a removable mold for the tread of a reinforced ooncrete stadium and also a nosing stripv that is separated from the forward edge of the tread after the setting of the concrete thereof.

A further object of the invention is to provide amold of the foregoing character that is formed of inter-fitting sections detachably engaged with metallic risers with the latter arranged in stepped formation with the head of one riser substantially in the plane ofthe foot of an adjacent riser, the' molds or forms being retained in position by brace rods and clips that are readily removable to facilitate removal of the molds or forms after the concrete treads are set.

With the above and other objects in view that i will become apparent as the nature of the invention is better understood, the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

Figure l is a fragmentary sectional .View showing molds or forms supporting the plastic treads of a reenforced concrete stadium with the devices for holding the molds or forms in position;

Figure-2 is a fragmentary top plan view showing one mold in position and a second mold angularly disposed or tilted during placement for inter-fitting engagement with the set molds;

Figure 3 is a top plan View of one of the molds or forms showing cut away corners at one end thereof to escape head and base flanges of adjacent metallic risers to permit placement of the mold or form in tread supporting position;

Figure 4 is a fragmentary plan view of Vthe nosing strip for the forward edge of the tread; and

Figure 5 is a detail sectional View showing the inter-fitting connection between adjacent ends of the molds or forms.

The mold or form is designed for supporting the concrete tread when laid in a plastic condition as set forth in the patent hereinbefore referred to and as disclosed herein, the stadium including I-beams I0 constituting metallic risers and arranged in step formation as shown in Fig. 1, each I-beam comprising a web II, a head cornprising flanges I2 and I3 and a foot comprising flanges I4 and I5. The risers are connected by means Vof. tieA rods I6, each tie rod being connected at corresponding ends to the web I I of an I-beam adjacent the base flanges Ill and I5 and threaded for the reception of nuts I'I at opposite sides of the flanges while the opposite ends of 5 each tie rod are angularly bent downwardly as at I8 for passage through the head fiange I2 and is threaded for the reception of a nut I9 at each side of the head flange for clamping the tie rods infposition.' By adjusting the nuts I'I l0- and I9, any irregularity or distortion in the I beams I il are removed and the I-beams are placed in absolute parallelism.

- The mold or form is illustrated in Figure 3 and'being designated in general by the reference 15 character 2l) comprises a pair of cross-bars 2l and 22 arranged in` spaced relation and to which a plurality of panels or boards 23 are permanently secured as at 24, it being understood however that a single plate construction may be 20 employed in lieu. of the separate panels or boards 23. As shown more clearly in Figure 3, the cross bars 2l and 22 extend laterally or outwardly of the opposite sides of the panels or boards 23 as sho-wn at 25 and 26. The ends 23a 25 of the panels 23 project beyond the adjacent side edge of the cross-bar 2l to provide an overhanging ledge while the other ends 23h of the panels terminate in spaced relation to an edge of the cross bar 22 to provide a ledge 22a. The 30 opposite collars of the overhanging ledge 23a are cut away as at 2l to provide angle shoulders 28 and 2g.

A mold or form is first placed into position as illustrated in` Figure 1 with the panels 23 35 disposed beneath a head flange I3 and a base flange I in spaced relation tol the webs II of the: rise-rs, the projecting ends 25 of the cross bars 2| and 22 engaging the webs II while the projecting ends 26 terminate substantially in the 40 planes of the outer edges of the base flanges I5. When so disposed, U-shaped clips 33 are engaged with the base flanges I5 and cross bar ends 26 while struts or brace bars 3I are wedged into position between the base flanges I5 and the 45 molds as shown in Figure 1.

The succeeding molds are then placed in position, and as shown in Figure 2, the second mold is inclined or tilted to position the side shoulders 28 of the out away portions 21 for engagement 50 with the adjacent side edges of the head ange I2 and base flange I4 while the shoulders 29 are engaged with the undersides of said flanges to pivot thereon when the lower end of the mold is elevated for positioning the overhanging ledge 5 23a of the mold onto the ledge 22a of the previously set mold, and when this second mold is in position, the same is so retained by means of the brace bars or struts 3i and the U-shaped clips 30, each succeeding mold section being similarly placed in position. The cut away corners 21 at one end of the mold permit the intertting engagement between adjacent ends of the molds as shown in Figure 5.

The nosing strip 32 shown in detail in Figure 4 in the form of an elongated bar carries at one side edge thereof laterally projecting bifurcated cleats 33 that are received on the angle ends I8 of the tie rods I6 below the head flanges I2 that are retained in position by the adjacent nut I9. in Figure l is then placed onfthe tierods I6 and concrete 35 poured onto the mold to embed the tie rods and metallic reenforce 34, the concrete being confined by the web II of a riser and the nosing strip 32, The upper surface of the concrete tread 34 is suitably inclined for drainage purposes to facilitate cleaning of the stadium. After the concrete treads are set, nosing strips 32 are removed by loosening the lower nut I9 to permit disengagement of the cleats 33 therewith, the nut being thereafter tightened and the forms 20 are removed. To remove the forms, the strut braces 3I are knocked out of position and the clips 33 disengaged from the base flanges I5 and cross bar extensions 26 and should the molds adhere to the lower face of the concrete, they may be readily pried therefrom by a downward pull on the projecting ends 25 and 26 of the cross bars. It is to be noted that the placement of all forms is accomplished at a point above the I-beams and scaifolding or erection of sub- A metallic reenforcing element 34 as shown structures are not required. The building and knocking down of the forms is thus greatly facilitated as all work in connection with the forms is performed from above.

From the above detailed description of the invention, it is believed that the construction and operation thereof will at once be apparent, and While there is herein shown and described the preferred embodiment of the invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

I claim:-

In a mold for reenforced concrete stadiums, wherein the stadium embodies metallic risers of I-beam formation and concrete treads, a mold for the concrete tread engageable with the undersides of the head and base anges of adjacent risers, an intertting connection between adja cent molds, one mold end at the connection being cut-away at the corners thereof to clear the adjacent edges of the riser flanges during placement of the molds in intertting engagement, each mold including cross bars extending outwardly of the side edges thereof and spaced from the I-beain flanges when in position, the crossbars being arranged adjacent the ends of the molds for limiting the intertting connection therebetween, clamping means engaged with the base flange and adjacent cross-bar extensions at one side of the mold and adapted toI flex the extensions for more intimate contact of the mold with the I-beam flanges and brace rods extending between the other side of the moldrand adjacent lower base flange.

WILL ALBAN CANNON.

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