US2427401A

US2427401A - Reinforcement member

Info

Publication number: US2427401A
Application number: US648642A
Authority: US
Inventors: Gillberg Johannes
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-03-06
Filing date: 1946-02-19
Publication date: 1947-09-16
Anticipated expiration: 1964-09-16

Description

Sept. 16, 1947. G1LLBERG REINFORCEMENT MEMBER Fiied Feb. 19, 1946 2 Sheets-Sheet 1 p 947. J. lLLBERG J 2,427,401

REINFORCEMENT MEMBER Filed Feb. 19, 1946 2 Sheets-Shet 2 'j'z; .10 .6 jz a /0 41 a 2 Patented Sept. 16, 1947 Application February 19, 1946, Serial No. 648,642 In Sweden March 6, 1943 Section- 1, Public Law 690. August 8, 1946. Patent expires March 6, 1963- Claims.

In the casting of fioorings and the like structures from reinforced concrete, reinforcement members are used which consist of a great number of straight reinforcement irons having hooklike bends at the ends thereof, said bends having to be directed upwardly when the irons are cast into the concrete. Theindividual reinforcement irons are bonded together by means of thin iron wire to cause them tomaintain their mutual positions when cast into the concrete. The mounting of such a reinforcement is time-wasting, and the reinforcement is very sensitive prior to and during the casting operation. The workmen frequently tread upon the same, and it will then readily happen that the reinforcement irons are displaced relatively to each other and turned, so that the end hooks thereof frequently become directed sideways Such a displacement of the reinforcement irons will also be caused easily, for instance, when the individual irons are raised when the lower part of the concrete is supplied or at the vibrating of the concrete mass, the strength of the finished structure being then influenced thereby.

The object of the present invention is to avoid the above-named inconvenience by an improved construction of the reinforcement member.

In the drawings, the invention is described more closely hereinafter with referenc to embodiments illustrated by way of example in the accompanying drawings.

Fig. 1 is a View in elevation showing a bundled reinforcement member according to the invention. Fig. 2' shows the same reinforcement member viewed from above in perspective during the pulling-apart of the arms. Fig. 3 shows a detail. Figs. 4 and 5 show a second embodiment, Fig. 5 being a horizontal view of the reinforcement member during the pulling apart of the arms. Figs. 6 and '7 show a third embodiment in a corresponding manner. Figs. 8-13 show re inforcement members according to Figs. l-7 in reinforcing position, the figures being represented partly in plan view and partly in section. Fig. 14 is a plan View of acomb'i-nation of different reinforcement members. Fig. 15 shows a section through a reinforced wall. Fig. 16 shows a fourth embodiment.

In Figs. 1 and 2, the reinforcement member is shown in its bundled state, that is to say as it is finished in the factory and transported to the place of use. The reinforcement member is made from ordinary round iron but in a coherent length comprising forwardly and backwardly extending parts or arms 5 formed by turn bends 3,

4. 'I he parts or arms 5 are made alternately of different lengthsso that their turn bends project outside one another on both sides of the bundle. The outer turn bends are designated by 3 and the inner ones by 4. In the compressed state of the bundle, adjacent parts are disposed crosswise relatively to each other. In use, the parts iare pulled out at right angles to the vertical direction of the bundle (at right angles to the plane of the paper in Fig. '1), as shown in Fig. 2. The arms are thus caused to lie substantially in the same plane and may be located so as to be parallel with one another, or, if desired, they may form an angle between themselves.

Figs. 8 and 9 show two reinforcement members I and 2 devised according to Figs. 1 and 2, the same being arranged in position for service within a flooring, the concrete being indicated at 9. The reinforcement members I and 2 are located at right "angles to each other. Their projecting turn bends 3 rest on the walls 6,

whereas the turn bends 4 terminate inside the walls. The reinforcement members are ordered from the manufacturer to the desired length of the arms 5.

As will be seen from Fig. 3, the end portions 3 and 4- may be bent 'angularly upwards to the plane of the shanks 5 so as to be anchored more safely in the concrete.

In the embodiment according to Figs. 4 and 5, the adjacent arms l, 8 separated by the

turn bends

3, 4 are arranged substantially in parallel to each other. Preferably, the uppermost arms I are slightly curved downwardly between the turn bends so as to be capable of taking up the tensile stresses more effectively.

In the example according to Figs. 4 and 5,

the shanks 1 and 8 are pulled apart in the same direction in which the bundle is compressed, as shown in Fig. 5. As desired, the arms 1, 8 will in their pulled-out state form a greater or smaller angle between themselves. In such a reinforcement member, the arms 1 form an upper row of reinforcement rods, while the arms 8 Fig. 14 shows a combination of a reinforcement member according to Figs. 1, 2 and a reinforcement member according to Figs. 4 and 5. In the same manner, the embodiments shown may be combined as desired.

Fig. 15 shows a section through a concrete wall. Here, the rows of arms parallelling one another are located each along one side of the wall. If desired, the reinforcement member it may have a second reinforcement member H arranged Within it.

Fig. 16 shows a reinforcement member having th'e arms 5 pulled apart. Here, the

turn bends

3 and 4 are staggered alternately on one side only, whereas the turn bends IE on the other side are aligned.

Due to the fact that the reinforcement member is continuously coherent, the reinforcement when applied will be seated safely with a minimum of bonding wires. The work which is otherwise involvedby the severing of separate reinforcement irons to lengths of the proper size and by the bending of the ends is also done away with. Due to the fact that the parts of the continuously coherent reinforcement member are made of different lengths, the reinforcement can be concentrated to such portions of the cast flooring, where the bending moments have their maximum values. At the edge portions, where the moments have lower values, th'e reinforcement will also be less, whereby a saving of material is obtained.

Due to the fact that the reinforcement member can be delivered from the factory in a compressed bundle, the transport is highly facilitated in comparison with the use of loose iron rods.

For the tensile strength, the total sectional area of the reinforcement irons is decisive, but to counteract the formation of fissures in the concrete and to obtain a larger adhering surface, it will be found to be more advantageous to employ a number of thin irons than only a few thicker irons. If reinforcement irons separated from each other were used, it would be more troublesome and expensive, from the point of view of mounting and transport, to use thin irons. By the present invention, this additional trouble is done away with, and facilities therefore present themselves for using the more advantageous small iron dimensions, which will be useful for the durability of the concrete structure. The'invention thus brings about a saving of time and material, while th quality of th'e concrete structure is im proved at the same time.

Although the reinforcement members according to the invention are primarily intended for concrete structures, they may obviously also be used for the reinforcement of other building materials.

What I claim is:

1. A reinforcement member for taking up tensile stresses in building materials, consisting of a coherent continuous reinforcement iron having alternate right and left turns of different lengths, the turn bends of said reinforcement iron projecting alternately outside one another on at least one side of the reinforcement member, said reinforcement iron being constructed and arranged to be compressed into a bundle from which the turns can be pulled apart to a desired relative spacing.

2. A reinforcement member for taking up tensile stresses in building materials, consisting of a coherent continuous reinforcement iron having alternate right and left turns of different lengths, the turn bends of said reinforcement iron projecting alternately outside one another on at least one side of the reinforcement member, said reinforcement iron being constructed and arranged to be compressed into a bundle from which the turns can be pulled apart to a desired relative spacing, adjacent turns being located crosswise relative to each other in the bundled state of said reinforcement iron.

3. A reinforcement member for taking up tensile stresses in buildingv materials, consisting of a coherent continuous reinforcement iron having alternate right and left turns of different lengths, the turn bends of said reinforcement iron projecting alternately outside one another on at least one side of the reinforcement member, said reinforcement iron being constructed and arranged to be compressed into a bundle from which the turns Can be pulled apart to a desired relative spacing, said turns being substantially parallel to one another in the bundled state of said reinforcement iron.

4. A reinforcement member for taking up tensile stresses in building materials, consisting of a coherent continuous reinforcement iron having alternate right and left turns of different lengths, said right and left turns being located at different levels with the upper turns slightly curved downwards toward the lower turns, the turn bend of said reinforcement iron projecting alternately outside one another on at least one side of the reinforcement member, said reinforcement iron being constructed and arranged to be compressed into a bundle from which the turns can be pull d apart to a desired relative spacing.

5. A reinforcement member for taking up tensile stresses in building materials, consisting of a coherent continuous reinforcement iron having alternate right and left turns of different lengths, the turn bends of said reinforcement iron projecting alternately outside one another on at least one side of the reinforcement member, said reinforcement iron being constructed and arranged to be compressed into a bundle from which the turns can be pulled apart to a desired relative spacing, said turn bends being arranged such as to constitute closed loops when viewed from the side.

. J OHANNES GILLBERG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,345,663 Cabell July 6, 1920 1,358,518 Cabell Nov. 9, 1920