US1280426A

US1280426A - Manufacture of reinforced concrete structures.

Info

Publication number: US1280426A
Application number: US7991216A
Authority: US
Inventors: Fernand Dumas
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-02-23
Filing date: 1916-02-23
Publication date: 1918-10-01
Anticipated expiration: 1935-10-01

Description

F. DUMAS. vIVIANUFACTURE 0F REINFQRCED CONCRETE STRUCTURES,

A'PPLICATTON FILED FEB. 23| |916.

Patented 001;. 1, 1918.

2 SHEETS-SHEET 1.

umu.. wqsuma mu, n, c.

'F. DUMAS. MANUFACTURE 0F REINFORCED CONCRETE STRUCTURES.

APF'LICATION FILED FEB. 23, 1916- LQAQ.

2 SHEETS-SHEET 2.

Patented Oct. 1, 1918,

" @d F Fhl.

rnnivann DUMAs, or nonoivr, SWITZERLAND.

Specification of Letters Patent.

Patented Cet. il, 1918..

pplication led February 23, ,1916. Serial No. 79,912.

To all whom t may concern.'

Be it known that I, FnnNAND DUMAS, architect, a citizen of Switzerland, residing at Romont, Canton of Fribourg, in the Confederation of Switzerland, Vhave invented `certain new and useful Improvements in the Manufacture of Reinforced Concrete Structures, of which the following is a specifica tion.

Hollow poles of reinforcedv concrete as usually hitherto constructed have the disadvantage of being recessed down to their lower ends on account of the manufacturers being obliged to withdraw the core of the mold through one of the ends' of the pole.

The hollow pole made according'to `this r invention comprises on the contrar in at least a portion of its length, a hollow inner core or mold which is a permanent part of the pole, and owing to which the latter can be made in onel piece with both its end sealed.

The said hollow inner core or mold is preferably made of hollow terra cotta tiles and consists of superposed elements, the outside dimensions of which gradually decrease upwardly while the inner diameter is constant, and the two ends of the pole are solid and without a core.

In the drawing:

Figure 1 shows a portion of a pole, partly in elevation and partly in longitudinal section.

Fig. 2 shows in perspective a portion of a smooth conical pole in the course of forma.- tion.

Fig. 3 is a cross-section at the bottom of the pole shown in Fig. 2.

Figs. 4L to 6 are cross-sections of the elements of the same pole at different heights, showing the shapes of the superposed elements of the inner core of terra cotta and the corresponding changes in the reinforcements of the concrete.

Figs. 7 to 9 are cross-sections at different heights of. a pole with a grooved or fluted outer surface, and

Figs. l0 to 13 are cross-sections of various modified constructions of the inner hollow core and of the pole itself.

As will be seen from Fig. l, the pole comprises a solid concrete base c above which is a hollow portion a1 tapering upwardly and wherein are arranged superposed hollow terra cotta tiles or cores b, 61, b2, b3, and

finally a solid portion a2 forming the top of the pole.

The pole is preferably molded in a vertical position in the following manner:

In a suitable place the first outside mold or coifer is secured to form the solid base a and it is filled to about half the height of a with Portland cement. The lower ends of the reinforcements c are then introduced into theA cement, while the -upper ends are suspended to a scaffolding erected for the purpose. The molding of the base a is then completed. Then on the latter is placed the first tile b of the inner hollow core, around `which is arranged a second outer mold (not shown in the drawing), and cement is introduced between this second mold'and the core member b. Then -the operation 1s ccnl tinued by superposing new cores b and new outside molds.

This work can be facilitated as soon as the base a is formed by placing an iron tube CZ in the axial center of the latter and by fixing it in a vertical position, for instance by suspension to the same scaffolding as the reinforcements c are attached.

The cores 'b are then threaded consecutively on the tube cl in the desired sequence, the cross-sectional shape being changed for instance every 3 meters. The irons or other reinforcements being held in place, the elements of outside molds or coffers are placed one by one on the top of each other and the molding of the pole is continued in this manner until the top portion a2 is reached. `Then the tube l is withdrawn, and the solid top portion a2 is molded without a core. The outside diameter of the tube l corresponds to the smallest inside diameter of all the elements of the hollow tile core ZJ, 1, b2 as shown in dotted lines in the cross-sec tions. Those of the reinforcements 0 which extend to the top will be embedded in the solid top portion a2. y The sections of the 'hollow cores are made so as to facilitate their centering about the tube d and to aid the insertion of the reinforcements c. It will be seen that the hollow cores b of Figs. 3 to G can be easily superposed on each other, and the same applies to the hollow cores b of Figs. 7 to 9.

The inner and outer shapes of the cores b as well as of the pole itself, may vary according to requirements. The ribs with which the said hollow cores are provided either intended to be placed so as to oii'er greater resistance than an ordinary pole, the major axis being placed inthe direction of the greatest strain, for instance in the direction of the wind acting on an overhead electric line.

The pole, having a base of the oval crosssection shown in Fig. l0 can be of the circular cross-section shown in Fig. l1 at the top. The smallest diameter of the core of Fig. l0 corresponds to the largest diameter of the core of Fig. l1.

Poles of square cross-section are preferably provided with inner ribs correspondiiig to the outei angles, in oider to facilitate the arrangement of the reinforcements o.

i The sections of outer molds or coffers can be made for instance one meter high, and the most suitable places for manufacturing the `poles are those having differences of level `facilitating installation of vertical vmolds, Aand situated close to a railway station.

I claim as my invention: 1. A concrete pole comprising a core built up of a plu ality of superimposed hollow tiles having varied outer diameters and inner diameters of substantially the same di.- mension, the said hollow tiles` being longitudinally ribbed oii their outer surfaces, and an exterior casing of concrete molded around the coie of superimposed hollow tiles.

2. A concrete pole comprising a solid base at the larger end thereof, a core built up of a plurality `of superimposed hollow tiles having a varied outer diameter, and the smallest inner diameter of each 0f which holloii7 tiles is substantially the same, the said hollow tiles being longitudinally ribbed on their outer surfaces, an exterior casing of concrete molded around the core of superim posed hollow tiles, a plurality of reinforcing bars, each reinforcing bar being molded into the exterior concrete casing, and lying between the longitudinal ribs oii the exterior of` the hollow tiles forming the core, and a solid top member at the smaller end of the pole.

In testimony whereof I have affixed my signature iupi'esence of two witnesses.

v FERNAND DUMAS.

Witnesses Dr. Roi). WURTEMBERGER, Louis H. MUNIG.

Copies of this patent may be obtane for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.