US1793196A - Support for initially-tensioned reenforcements - Google Patents

Description

FeB. 17, 1931'. H. SOR-ENSEN 1,793,196

"SUPPORT FOR INITIALLY TENSIIfONED REENFORCEIENTS Filed Sept. 11." 1929 INVENTOR Patented Feb. 17, 1931 PATENT OFFICE HENRY SORENSEN, OF SAN FRANCISCO, CALIFORNIA SUIPPORT FOR INITIALLY-TENSIONED REENFOECEMENTS Application filed September 11, 1929. Serial No. 391,775

My invention maybe applied to any form of infllled structure, for which it is adapted, and I have, in the following description and its accompanying drawings, described my invention applied to the walls of infil-led structures for fireproof buildings.

In the drawings:

Fig. 1 illustrates the principle of my invention. V

Fig. 2 is asection taken at aa of Fig. 1. v Fig. 3 illustrates my invention applied to the walls of a fireproof building.

Fig. 4 is a section taken at b?) of Fig. 3.

' Fig. 5 illustrates a modified way in which to'apply my invention to the Walls of a' fireproof building.

Fig, 6 is a section taken at 6-0 of Fig. 5.

Fig.7 is an enlarged section taken at dd in Fig. 3. 7 7

Similar parts of the drawings are illdicated by similar numerals, and numeral 1 designates the beams. Numeral 2 designates flat steel of which beams 1 are made. 3 are plates, 4 are bolts or rivets. 5 are reinforcement rods. 6 are bent ends of rods 5. 7 are hooked ends of rods 5. 8 are wedges. 9 are permanent concrete struts. 10 are flanges on flat steel 2. 11 are flanged columns. 12 the flanges on columns 11. 13 are temporary struts. 15 are floor reinforcements. 16 are concrete forms. 17 are dotted lines which indicate floors. 18 are I-beam columns. 19 are brackets. 20 are reinforcement rods attached to columns 11. 21 are holes for bolts 4. v v

Fig. 1 is the longitudinal fraction of two beams 1, the one beam above the other, and I construct these beams in the following manner:

Between the pairs of opposed flat steel 2, I place plates 3 at suitable intervals, and rivet the pairs of flat steel 2 together, through plates 3, by means of bolts 1 through holes 21. Beams 1 are, inthat way, composed of the pairs of flat steel 2, plates 3 and bolts or rivets 4.

While any known type of reinforcements may be used, as well as any desired way, in which to initially tension and lock the reinforcements to beams 1, I prefer to arrange the reinforcements, as well as their initial tensloning, and locking, to beams 1, in the following manner I bend rods 5 together in their middle, so that each reinforcement consists of double rods 5, of equal lengths, which hang together at their bent ends 6. V

I now thread the two ends, of rods 5, be-

tween the pairs of flat steel 2, of the one of 7 said two beams l, aml I thereupon thread the bent end 6, between the pairs of flat steel 2, of the other of said beams 1. After that I v hook ends 7, of the first one referred to of beams 1, by bending each end 7 round each one of the edges of the pairs of flat steel 2, and I thereupon drive wedges 8, which engage the other beam 1, through the bent ends 6 of rods 5. Ends 6 extend a suitable distance outside the edges of the pairsof flat steel 2, of the other one referred to of beams 1, and as wedges 8 engage these edges, the driving of wedges 8 will initially tension and lock rods 5 to beams 1, due to the fact that ends 7 asabove described, are hooked to the first one referred to of said beams 1. I prefer to give wedges 8 a gradual incline, so as to facilitate a more efficient tensioning of rods 5, when wedges 8 are driven, and I also prefer to round olf the top of wedges 8, so that they may have a snug fit in the bent end 6 of rods 5.

In a manner, which I will describe here inafter, I place concrete struts 9, of which I have shown two sections, between the two beams 1, so that struts 9 prevent any deflection of beams 1, due to the above described initial tensioning and locking of rods 5 to beams 1. The initially tensioned rods 5 are embedded in struts 9. Struts 9 may consist of any other suitable material besides concrete.

2 is a section of Fig. 1, taken at a-a.

In Fig. 3 I have shown a modification of my invention applied to the Walls of infilled structures for fireproof buildings, and on said Fig. 3 I have shown one illustration of rods 5, with the various members in position, ready to receive the concrete for strut 9, while the other illustration shows strut 9, with rods 5 and wedges 8 in their finished positions with strut 9.

I supply the top edges of beams 1 with outwardly extending flanges 10, and for reasons, which I will explain below, I prefer to make flanges 10, of said beams 1, more nar row than the width of flat steel 2', the width of flat steel 2 corresponding to the depth of beams 1.

Columns 11 consist of double pairs of that steel 2 and flanges 10 bolted alternately together by bolts 4, through holes 21 and through plates 3, and I prefer to make 2 and 10 of the same size, so that columns 11 are composed of four equal sized pairs of spaced flanges 12, plates 3 being placed at suitable intervals between the individual members of flanges 12, in the same manner as plates 3 are placed intermediate the individual members of the spaced flat steel 2 of beams 1.

The pairs of spaced flat steel 2, of said. beams 1, grip flanges 12, of columns 11, and are attached to said flanges 1.2 by means of bolts, or rivets, 1, which pass through plates 3. In this way I save the material and labor for brackets, which are generally used to attach the beams to the columns. I have shown plates 3 extending beyond the ends of columns 11, so to use these extending ends oi": plates 3 as connections for extensions of columns 11.

I now make the following arrangement for the placement of concrete struts 9. l3e-v tween the two wall beams 1 I place temporary struts 13. which may be made of wood or any other suitable material, and I place these struts 13 on both sides of the space, which is occupied by struts 9. I next place rods 5 between struts 13, and tension and lock rods 5 to wall beams 1, which are placed one above the other. by means of wedges 8, in the man ner which I have described under Fig. 1 above.

In cases where heavy tensioning is applied to rods 5. I prefer to use clamps 14, .so as to prevent hooks 7 from straightening out. said clamps 14 being driven over the hooked ends 7 of rods 5.

I hook floor reinforcements 15 to flanges 10. the dotted lines 17 indicating the floors. which may be made otany desired construction.

The temporary struts 1?), being placed on both sides of each unit of rods 5. will prevent any deflection oi beams 1, so that the initial tension, which is imparted into rods 5, will be maintained.

I now place concrete forms 16 between struts 13 and rods 5, and cast concrete struts 9 around rods 5, the temporary struts 13 being isolated from concrete struts 9 by terms 16. By making flanges 10 sutflcicntly narrow, to which I have alluded above, I obtain space, between forms 16 and flanges 10, into which I can pour the concrete for struts 9.

After concrete struts 9 have set into hard cohesion with rods 5, between said beams 1, I

remove the temporarystruts 13, which are isolated from struts 9 by means of forms 16. Struts 9 will then, permanently, prevent any deflections of beams 1., and thereby always maintain the tension in rods 5, due to the fact that struts 9 extend between beams 1.

In addition to preventing the deflections of beams 1, the placement of struts 13 and 9, as above described, will also safeguard against any shearing strains, to which bolts 41, which hold columns 11 and beams 1 together, would otherwise be subjected, and when, as above described, the permanent struts 9 take the place of the temporary struts 13, the wall space between struts 9, as well as the wall space between struts 9 and columns 11, may be used for window-s or doors, or filled with other suitable material.

Fig. 4: is a section of Fig. .3 taken at Z)b.

In Fig. 5 I have shown another modified construction of my invention applied to the walls of infllled fireproof buildings, and to the beams 1, shown in Fig. 5 I have attached flanges 10 along their lower edges, as well as to'their upperedges. Columns 18 are here shown constructed in the usual manner of I-beams, with beams 1 attached to these columns 18 by means of brackets 19, said brackets 19 being riveted, in the general way, to columns 18, as well as to beams l. The various other parts, which are shown in Fig. 5, are above referred to under Fig. 3, and are put together in the manner as already explained under Fig. 3. By adding flanges 10 to the lower edges of beams 1, as well as to their upper edges, I obtain a double grip by ends '7, of rods 5, on beams 1, due to the-double bending of ends 7, as illustrated .on the drawings. It-is evident, that I may also attach beams 1, as shown with the upper and lower flanges 10 in Fig. 5, to flanges 12, of columns 11, in the same manner as I have described under Fig. 3.

Fig. 6 is a section of Fig. 5 taken at cc.

Fig. 7 is an enlarged section taken at (Z(l of columns 11, on Fig. 3, and illustrates how reinforcements 20 may be threaded through and hooked to flanges 12, to serve as horizontal wall reinforcements in all four directions, or any one of these directions, whenever that is desired.

By composing beams 1 of the spaced flat steel 2, I can thread rods 5 through the middle of beams 1, and thereby initially tension and lock rods i -to the edges of beams 1 by the simple, efficient and labor saving application of wedges 8 in combination with hooks 7, as herein described, while the draw, which is caused by the tensioned rods 5 upon beams 1, will act upon beams 1 from their middle, and thereby avoid twisting, or turning, strains on beams 1.

Struts 9 prevent any deflection of beams 1, which might occur due to the draw caused by the tensioned rods 5, and thereby mairn tain the tension in rods 5, and struts 9 also prevent any shearing strains upon bolts 4:.

The placement of the initially tensioned rods 5, in the walls of the building, will materially assist the walls to withstand presments to said supports, the combination of said supports consisting of spaced flat steel, plates placed at intervals intermediate said flat steel, rivets holding said flat steel together, the ends of said reinforcementspassed between said flat steel, means to locksaid ends to the edges of said flat steel, and the infllling of said structure embedding said initially tensioned reinforcements.

2. In the supports of an infilled structure with initially tensioned reinforcements connecting and locked to said supports and including struts to resist the deflection of said supports, the combination of spaced flat steel comprising said supports, plates placed at intervals intermediate said flat steel, rivets holding said flat steel together, the ends of said reinforcements passed between said flat steel, means to lock said ends to the edges of said flat steel, and said struts incasing said reinforcements.

3. In the wall carrying beams of the iufilled structure of a fireproof building with vertical initially tensioned reinforcements connecting and locked to said beams and including struts to resist the deflection of said beams, the combination of pairs of spaced flat steel comprising said beams, plates placed at intervals intermediate the individual members of said pairs of fiat steel, rivets holding said individual members together, the ends of said reinforcements passed be tween said individual members, means adapted to lock said ends to said beams, flanges formed on the edges of said individual members, floor reinforcements hooked to said flan es, and infilled material in said struts em edding said reinforcements.

HENRY SORENSEN.

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