Reinforced-concrete pile.

Application filed February 9, 1909. Serial No. 476,993.

To all whom it may concern:

Be it known that I, Thomas Stedham, citizen of the Dominion of Canada, residing at Victoria, in the Province of British Co5 lumbia, Canada, have invented a new and' useful Reinforced - Concrete Pile, of which the following is a specification.

This invention relates to a metal reinforced concrete pile designed not only to 10 sustain the compression of its load and resist the lateral flexure consequent thereon, but to stand the shock of driving without breaking the concrete from its metal reinforcing frame which frame is carefully inclosed 15 within the concrete to protect it from corrosion.

The invention is particularly described in the following specification and illustrated in the drawings by which it is accompanied, in 20 which;

Figure 1. is a vertical elevation of the metal frame of the pile, the contour of its inclosing concrete being indicated by dot and clash lines, Fig. 2. is a cross section to an 25 enlarged scale adjacent to a spacing frame, Fig. 3. an enlarged detail of the lower end showing the tie of the structural framework to the point or shoe, and Fig. 4. a detail qf the spacer. Fig. 5, is an enlarged view simi30 lar to Fig. 1, of a portion of the invention.

Fig. 6, is a detail perspective view of a part of the invention.

In these drawings 2 represents the point or shoe preferably of solid cast steel in the 35 metal of which shoe are cast or otherwise secured four, members 3 of tee cross section projecting upward from the middle of the sides and bent inward slightly at the upper ends which are inwardly turned as shown in 40 Fig. 3.

Butting into each corner of a depression in the upper surface of the shoe 2, see Fig. 1, are four rods 4 preferably of steel, polygonal in cross section as I find that cross sec45 tion affords the concrete a better hold on the rods. These rods 4 extend continuously the whole length of the pile to about four inches of the top and are tied to cast iron spacing frames 6 which are in practice at intervals 50 of about six feet, by wire ties 5 about No. 8 gage where are in practice spaced about four inches apart, the ends of the ties being turned inward together that the concrete may afford a better hold around them. Be55 tween each pair of the spacing frames 6 wrought iron spacers 7 are introduced be tween each pair of rods to resist the pull of the wire ties 5 before the concrete is applied.

To strengthen the pile against flexure toward the middle supplementary rods 10 60 similar to those 4 extend throughout the midlength from about six feet from either end. These, rods 10 are tied by wire to the inner corners of the spacing frames 6 and their ends should be split for a length ap- 65 proximately equal to twice their diameter.

At the upper end of the pile and introduced between the tie wires 5 of the columns 4 are diagonal rods 11 extending from a position about four inches laterally from the 70 top of each corner column 4 to a position about four inches from the next column and secured by wires to the wires 5 to retain them in position during the introduction of the concrete. These are designed to receive and 75 distribute the impact of the blow while driving. This constitutes the metal frame to reinforce the strength of the concrete which entirely incloses the frame of the pile and extends in cross section about one and 80 one half inches beyond the corner rods 4 and a similar distance on the inside within the supplementary rods 10, leaving a cylindrical core space 8 toward the metal center 9 which in lengths of about three feet six 85 inches with eighteen inches intervening extends from about six feet from the bottom to a similar distance from the top. These core spaces 8 are formed by the introduction of lengths of sheet metal pipe 9. A pile 9° structure is thus provided which may be designed to stand any superimposed load and that is so bonded together that the concrete will not break away from its reinforcing frame with the severe blow of the pile ⁹⁵driver, and that is reinforced to resist the tendency to lateral flexure due to its extreme length and restricted cross section. The extreme impact of the blow in driving is lessened by a special buffer cap which not being ¹⁰⁰material to this application is not riecessary to illustrate or describe. Tn their great strength a less number of these piles is required and a wharf may be built on them of metal or reinforced concrete and be thus ¹⁰⁵rendered safe from fire; and they are durable in their immunity from the attack of marine growths while the metal is fully protected from corrosion.