US1071045A - Reinforced-concrete column or pole. - Google Patents

Description

H. B. GRA. i REINPORGED CONCRETE COLUMN 0R POLE.

APPLICATION FILED MAY 27, 1911.

1,071 ,045; Patented Aug. 26, 1913 coLUMBlA PLANQGRAPH cn.. WASHINGTON. D. c.

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HENRI EDOUARD G-RA, OF GRENOBLE, FRANCE.

REINFORCED-CONCRETE COLUMN OR POLE.

Application led May 27, 1911.

To all whom t may concern Be it known that I, HENRI EDOUARD GRA, a citizen of the Confederation of Switzerland, residing at Grenoble, in the Republic of France, have invented certain new and useful Improvements in Reinforced- Concrete Columns or Poles, of which the following is a specilication.

My invention relates to a reinforced concrete column or pole the framework of which comprises vertical steel bars intimately bound together at intervals by straps or bands and ties, and the whole incased in concrete, giving a structure of great strength and one that is practically indeformable. The structure also possesses a high degree of elasticity permitting it to yield under bending strains without breaking.

I have selected for the purpose of illustrating my invention a pole adapted t-o support telegraph or telephone wires, or electric cables, although it is to be understood that the invent-ion is applicable to other uses.

The invention will be understood by reference to the accompanying drawings in which- Figure 1 shows a complete pole in elevation; Fig. 2 an enlarged vertical section of a portion of the pole on the plane of the line 2 2 of Fig. 4; Fig. 3 a vertical section of a portion of the pole on the plane of the line 8 3 of Fig. 4; Fig. 4 a transverse section on the plane 0f the line 4-4 of Fig. 2; Fig. 5 a transverse section on the plane of the line 5-5 of Fig. 2; Fig. 6 a transverse section through the upper part of the pole on the plane of the line 6 6 of Fig. l; and Fig. 7 a view of a portion of the metal framework around which the concrete is cast in suitable molds.

Similar reference numerals indicate similar parts in the several views.

The complete structure is of pyramidal form to give increased strength, and the framework around which concrete is cast comprises a series of vertical stay rods l on two sides of the pole. Various arrangements may be adopted for the disposition of these stay rods and their number may vary according to requirements. Thus, some of them may extend the entire length of the pole, others two-thirds or other distance of the length of the pole, and still others one-third the length of the pole; or they may be so disposed that there may be t-he desired number, say six, at each side extending from the Specification of Letters Patent.

Patented Aug. 26,1913.

Serial No. 629,806.

base Aone-third of the length of the pole; four for the next third; and two, preferably at the corners, for the remaining one-third of the pole. I merely give these numbers as a suggestion which has been followed successfully in practice.

The stay rods are maintained in their relation to each other by bands 2 which are dispo-sed at regular intervals apart, the said bands passing around the stay rods and anchored thereto in any suitable manner, as'by lacing, as indicated in Fig. 7. The ends of the bands may be joined by riveting, as shown in Fig. 4. In addition to the groups of stay rods l, I provide an additional rod 3 in the center of the sides on which are the rods l. These center rods 3 extend the full length of the pole, and are secured to the bands 2 and are bound together by ties 4 spaced throughout the pole at desired intervals between the bands 2. The rods, bands and ties constituting the framework are preferably of steel.

About the framework above described is cast, by means of suitable molds, cement of good quality so that the framework will be completely embedded therein. The molds are so constructed that the two sides of the pole containing the sets of stay rods l and 3 will be plain surfacesy throughout the length of the pole, and the two other faces will be formed with recessed sections 5. As shown in Figs. 3 and 4, the concrete about the bands 2 extends throughout the entire section of the po-le. That is to say, the bands 2 are completely embedded in the concrete, and the latter is of such thickness above and below the bands as to provide substantial foot-rests or steps 6 for climbing. These sections, as will be readily understood, are reinforced throughout by the bands 2. Between the steps 6 a cross section of the pole is in the fo-rm of a double T, the plain surfaced sides ofthe pole constituting the heads 7 connected by a web 8, the latter being reinforced by the ties 4, which prevent oblique fracture when the pole is bent under strain.

By the arrangement of the vertical rods 5 and 6 in the heads 7, and t-he disposition of the bands 2 and ties 4 the modulus of elasticity of the pole is such as to permit considerable bending in the directionof the arrows in Fig. 1 without fracture. It has been demonstrated in practice that a pole constructed as described is capable of considerable iiexure without showing any substantial deformation or a fracture of the concrete.

rihe upper part of the pole is preferably east solid; that. is, wit-hout the recessed seetions 5, as shown in Fig. l.

ll/Tliat l claim and desire to secure by Letters Patent of the United States is A concrete pole having in cross section alternating double T sections and square or l" rectangular sections presenting thereby plain surfaces on two opposite sides of the pole and rentrant sections on the two other sides,

longitudinal stay rods on the sides having the plain surfaces, and bands around said rods embedded in the square or rectangular sections.

In testimony whereof I have hereunto signed my name in the presence of two subseribing witnesses.

HENRI EDOUARD GRA.'

Witnesses T. BARRIER, J AMES GRA.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 2D. C.

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