US1033797A

US1033797A - Reinforcement system for concrete structures.

Info

Publication number: US1033797A
Application number: US39552807A
Authority: US
Inventors: Rudolph B Hartman
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-10-02
Filing date: 1907-10-02
Publication date: 1912-07-30
Anticipated expiration: 1929-07-30

Description

B. HARTMAN.' REINFORCEMENT SYSTEM FOR CONCRETE STRUCTURES.

APPLICATION FILED OCT. 2, 1907.

Patented July 30, 1912.

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REINFORCEMENT SYSTEM FOR CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented July 30, 1912.

Application filed October 2, 1907. Serial No. 395,528.

To all whom it may concern:

Be it known that I, RUDOLPH B. HART- MAN, of Milwaukee, W'isconsin, have invented a Reinforcement System for Concrete Structures, of which the following is a specification.

The object of this invention is to provide an improved disposition of the metal for reinforcing members of beams and columns in that type of construction known as reinforced or armored concrete.

More particularly the invention has in view such disposition of reinforcement in beams as will tie successive panels together forming what is known as continuous reinforcement, that is to say making the successive panels substantially parts of a single beam. I also aim by the same structure to provide (0,) an additional shear reinforcement; (1)) an additional tie for the cont-racti on stresses which arise in the setting of the concrete; (0) an additional resistance to cant-aliver strains; (cl) a resistance to transverse torque or torsional movement set up by the deflection of intermediate beams forming secondary panels at the junction with the main beams by which they are supported; and (e) a firmer and stronger bond between the beams and their supporting columns.

The nature of my invention is best eX- plained by a reference to the accompanying drawing taken in connection with the following description thereof.

In these drawings Figure 1 is a partly diagrammatic View of a part of a continuous beam of a number of panels, together with a portion of the supporting columns therefor. This view is supposed to show the beam and columns in section, but shows only certain reinforcements which are material to my invention, omitting any others which may be present. Fig. 2 is a longitudinal section through one panel of the beam shown in Fig. 1 on the larger scale and showing a full set of reinforcements. including those not a part of my invention and others forming a part thereof but not shown in Fig. 1. Fig. 3 is a plan section through a column and the ends of beams projecting therefrom. I

In these drawings every reference letter refers always to the same part.

Fig. 1 shows a continuous beam divided into panels a, supported by columns 6, these forming parts of the usual monolithic concrete structure. The element of my invention more particularly shown by this figure consists of the longitudinal reinforcing-rods c. The peculiarity of these rods is that each covers a length equal to two panels of the beam, beginning in the middle of one panel near the upper part thereof, passing downwardly in a diagonal or oblique direction to the center of the next panel at the lower part thereof, and then passing upwardly in a diagonal or oblique direction to the center of the third panel at the upper part thereof. As each rod covers two entire panels, the successive rods overlap so that the center of one rod is disposed beneath the ends of the two adjacent rods on either side. Furthermore these adjacent ends overlap as shown at (Z, so that they are for structural purposes tied together at this point by the binding force of the concrete. Moreover each pair of adjacent rods are similarly bound together at the point e where they cross each other at the center of each column. Thus the system of reinforcing rods as a whole forms a continuous series of bights separated by nodes. This system provides especially against contraction-stresses arising from the setting of the concrete. There is another purpose and effect of this system however in addition to the above, which is of great importance; to wit, it provides against the transverse torsional strain which is set up by intermediate or secondary beams when they are unequally loaded on opposite sides of the main beam. To illustrate this I have shown at f in dotted lines the positions of such intermediate or secondary beams and it will be obvious that in case a beam 7 joins the main panel a only on one side thereof, or if on both sides and one of said secondary beams is loaded more than the other, a torsional moment will be set up in the main beam, and my disposition of effectively continuous rods 0 will act as a reinforcement against this moment. Moreover I provide a special combination between the column and beam reinforcement by interlacing the former with the latter.

The column reinforcement may consist either of angle-irons g in the corners united by lattice-bars h (Figs. 1 and 3) or of longitudinal rods 2' connected at intervals by transverse hoops or other forms of ties y'. In either case the beam-reinforcing rods are caused to pass completely through the col umn-reinforcing structure so that there is a structural tie between said rods and the column-reinforcements g, h, i, and 7'; thus the junction between the beam and column is made stronger and is also an additional provision against shear.

In Fig. 2 one of the panels a is shown on a larger scale in order to illustrate not only the continuous reinforcement 0, but also other additional reinforcing-rods m, #1., disposed as shown along the bottom of the beam panels at the center and along the top thereof at the ends. The dotted line 0 represents the lower surface of the floor-slab, and in this floor-slab at the sides of the beam proper I provide horizontal reinforcing-rods 79, g, the former of which run only part way to the center and the latter run a little beyond the center so that their ends cross and are thus tied together, these ends being shown at q.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A floor support comprising continuous main girders, supporting columns therefor, reinforcing bars in length substantially equal to the distance between two spans and disposed in the girders in a series of nodes and loops, the bars crossing over the head of each column and approximately meeting in the center of each span, combined with a lateral floor support integral with and on one side of the beam between the columns.

2. A continuous concrete beam divided into spans, columns supporting said spans, longitudinally disposed reinforcing bars having their centers at the bottoms of the middles of adjacent spans and extending thence obliquely upward to the opposite side of the intervening column to the top of the beam forming nodes and loops, and a lateral floor support integral with and on one side ofthe beam between the columns.

3. A continuous beam embodying a plurality of spans, columns supporting the same, lateral floor supporting means integral with the beam and bars each covering a length equal to two spans of the beam, said bars beginning near the middle of one span adjacent the upper part thereof, passing downwardly in an oblique direction to the center of the adjacent span at the lower part thereof, and then passing upwardly in an oblique direction to the center of the next span at the upper part thereof, forming nodes and loops alternately at said lateral floor supporting means.

4. A continuous beam embodying a plurality of spans, columns supporting the same, lateral floor supporting means integral with the beam, and bars each covering a length equal to two spans of the beam, said bars beginning near the middle of one span adjacent the upper part thereof, passnodes and loops alternately at'said lateral floor supporting means, each bar covering two entlre panels.

5. A continuous beam embodying a plurality of spans, columns supporting the same, lateral floor supporting means, and bars each covering a length equal to two spans of the beam, said bars beginning near the middle of one span adjacent the upper part thereof, passing downwardly in an oblique direction to the center of the adjacent span at the lower part thereof, and then passing upwardly in an oblique direction to the center of the next span at the upper part thereof, forming nodes and loops alternately at said lateral floor supporting means, each bar covering two entire spans, and the successive bars overlapping with the center of one bar disposed adjacent the ends of the two adjacent bars on either side.

6. A continuous beam embodying a plurality of spans, columns supporting the same, lateral floor supporting means, and bars each covering a length equal to two spans of the beam, said bars beginning near the middle of one span adjacent the upper part thereof, passing downwardly in an oblique direction to the center of the adjacent span at the low-er part thereof, and then passing upwardly in an oblique direction. to the center of the next span at the upper part thereof, forming nodes and loops alternately at said lateral floor supporting means, each bar covering two entire spans, and the successive bars overlapping with the center of one bar disposed adjacent the ends of the two adjacent bars on either side with the adjacent ends of said bars overlapping whereby they are tied together at such points by the binding force of the concrete.

7. A continuous concrete beam divided into spans, columns supporting said spans, and longitudinally disposed reinforcing bars having their middles at the bottoms of the middles of adjacent spans and extending thence obliquely upward in a straight line to the opposite side of the intervening column to the top of the beam.

8. A concrete beam divided into spans, columns supporting said spans, lateral floor supporting means, and a plurality of oblique reinforcing rods each extending in a straight line from the bottom of one span on one side of its support to the top of the next span at the opposite side of its support, thus forming an X whose middle point is at the column in the middle of the beam, the nodes and loops thus formed being disposed alternately with a lateral floor support.

9. Means for continuous reinforcement of concrete beams divided into spans, and column supports for said spans, said means comprising longitudinally disposed bars each having a length equal to double that of a single span of the beam, the center of each bar being disposed at the bottom portion of the center of one span and thence passed upwardly obliquely in each direction beyond the column support to the upper portion of the center of the next span on each side.

10. Means for continuous reinforcement of concrete beams divided into spans, and column supports for said spans, said means comprising longitudinally disposed bars 1 each having a length equal to double that of a single span of the beam, the center of each bar being disposed at the bottom portion of the center of one span and thence passed upwardly obliquely in each direction beyond the column support to the upper portion of the center of the next span on each side, the ends of said bars being overlapped at substantially the center of each span.

In testimony whereof I have hereunto set my hand this 30th day of Sept. 1907.

RUDOLPH B. HARTMAN. W'itnesses:

CLARA L. HARTMAN, L. M. JEGER.

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

Washington, D. 0.