US1716710A

US1716710A - Tensioned concrete reenforcement

Info

Publication number: US1716710A
Application number: US238341A
Authority: US
Inventors: Sorensen Henry
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-12-07
Filing date: 1927-12-07
Publication date: 1929-06-11
Anticipated expiration: 1946-06-11

Description

H. SORENSEN TENSIONED CONCRETE REENFORCEMENT June 11, 1929.

. Filed Dec. 1927 Bil-1.1

INVENTOR Patented June 11, 1929.

PATENT I OFFI E. I

HENRY sonnns'nn, on SAN rnAivorsoo, crimson-um.

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Application filed December 7, 1927; Serial No. 238,341.-

My invention consists in the method to strut beams, or girders, which are drawn inwardly in infilled structures, where reenforcements are tensioned and locked to the beams, or girders, prior to the pouring, or laying, of the fireproof infilling; and while myinvention may be used in various parts of the building as well as in reenforced concrete structures designed for other purposes, I have described it applied to fireproof floors.

In the drawings Fig. 1 is a cut illustrating my invention, just prior to the tensioning of thereenforcements.

Fig. 2 is a cut illustrating my invention with the tensioned, and locked, reenforcements in place, all of which are embedded in concrete, or any other suitable infilling.

Fig. 3 illustrates a. plan view of my invention, with the tensioned and locked reenforcements, in place and ready to receive the infilling.

F ig. 4. illustrates a strut, which may, however, be of any other suitable design.

Similar numerals designate similar parts, and numeral 1 designates the reenforcements. 2 is a hook at one end of the reenforcement 1. 3 designates the beams, orgirders; 4 is a wedge-like member into which the other end of reenforcement 1 is bent. 5 is the point of the wedge-like member 1. 6 is the flange of the one of beams 3. 7 are the columns which support beams 3. 8 is a strut. 9 are bolts. 10 are holes in the web of beams 3. 11 are nuts which fit bolts 9. 12 designates the concrete or any other suitable infilling.

My invention may be applied to any known way, in which reenforcements are initially tensioned and locked to the, beams, or girders, and I have, herein, described the said tensioning and locking of the reenforce ments in the following manner.

As shown in Fig. 1, I hook ends 2, of reenforcements 1, to the flange of the one of the two opposed beams 3. 'Point 5, of the wedge-like member at, of the other end of reenforcement 1, just clears flange 6 of the opposed beam 3, so that reenforcement 1 be comes tensioned, when the wedge-like member 4 is driven against flange 6 of beam 3. After 1 is driven, point 5 is bent in, whereby reenforcement 1, while tensioned, becomes locked to the two opposed beams 3.

After having dealt with the above, I am now coming to that which constitutes my in vention, herein.

It will readily be understood, that the tensioning of'a number of reenforcements 1, will increase the inwardly drawing force on beams 3 with each added reenforcement 1; and that each additional, tensioned, reenforcement 1 will have theinclination to slacken the previously tensioned reenforce ments 1, due to the tendency which beams 3 have to be drawn further inwards with each added reenforcement. c

I, therefore, find it advisable to provide for means to adequately strut the beams 3 against the inward draw, which is caused by the tensioning of reenforcements 1, and in the drawings I have illustrated the means, by which I strut beams 3, as follows In Fig. l I have shown a cut of horizontally extending strut 8, which. is firmly attached to the upper part of the inside web of beam 3, by means of bolt 9 and nut 11, through hole 10 in said web. Strut 8 is put in place, before the initial tensioning of reenforcements 1 takes place, prior to the infilling of concrete 12, and when infilling 12 is poured strut 8 becomes embedded in 12, as shown in Fig. 2. Fig. 2 illustrates a completed concrete 11001, with the r'eenforcements 1, which were initially tensioned and looked to beams 3, also embedded. in concrete 12. Instead of using bolt 9 and nut 11, I mayrivet 8 to the web of beam 3.

In Fig. 3 I have shown a plan view of the system ready to receive the concrete. I prefer to attach strut 8 only to the outside beams, or girders,but on their inside web, for the reason that the draw, on each side of the inner beams 3, is equalized by the system of tensioned reenforcements 1 on both sidesof the inside beams 3. In or-' der to obtain this equal draw, I prefer to tension each row of the reenforcements 1, simultaneously, throughout the whole width, or length, of the building, with men working, at the same time, at each section of beams 3.

' In Fig. 4c I have shown a separate plan view of strut 8, as it is illustrated in Figures 1 and 2, and which consists of suitable lengths of angle-irons riveted together, on

8 is attached to the Web of beam 3, as hereintofore described. 7

I claim: 1

1. In an infilled structure with reenforce- 5 ments connecting and initially, tensioned and locked to opposed supports, means adapted to strut said supports against the draw caused by the initial tensioning of said reenforeements, said means remaining 10 embedded in the infilling of said structure.

HENRY SOBENSEN.