US954128A - Reinforced concrete. - Google Patents

Description

R, MoLAUGHLIN. v REINFORCED GONURETE. APPLICATION FILED JULY 21, 1908.

Patented Apr.5, 1910.

2 SHEETS-SHEET- 1.'

1.1 III-I III-- wi'meooco R. MoLAUGHLIN. REINFORUED CONCRETE.

. APPLICATION FILED JULY 21, 1908- I 954,128,. v Patented Apr. 5, 1910.

Utter/m4 ROBERT MGLAUGHLIN, OF BALTIMORE, MARYLAND.

REINFORCED CONCRETE.

Specification of Letters Patent.

Patented Apr. 5, 1910.

Application filed July 21, 1908. Serial No. 444,628.

To all whom 'it may concern:

Be it known that I, ROBERT lVICLAUGHLIN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented a certain new and useful Improvement in Reinforced Concrete, of which improvement. the following is a specification.

My invention relates to an improved construction of reinforced concrete, and its objcct isto provide cheap, efficient and scientifically constructed reinforcing members which are to be incorporated in concrete beams girders, or other supports wherebythe least amount of metal will be employed for a given strength as compared with the forms of construction now in general use.

A further object is to provlde a construction which can be easily manufactured and set up without the use'of much labor or time.

The leading and more important features of my invention consist in the application of the greater compressive strength of cast iron which is to resist the forces of compression in the concrete and thereby materially reduce the sectional area of all the compressive members and consequently reduce their weight and cost.

In the accompanying sheets of drawing illustrating the features. of my invention,- Figure 1 is a longitudinal section of a rein-- forced concrete girder showing an articulated or jointed compression member, and a taper tension member. Fig. 2 is a transverse section of same on line '2-2 of Fig. 1. Fig. 3 is an enlarged sectional view of articulated or jointed compression member, showing bolt for holding pieces together and for putting initial compression into compression member. Fig. i is an end view of same with bolt removed. Fig. 5 is a view in elevation of a tension member of varying sectional area, or tapering from a larger size at the middle to smaller sizes at both ends. Fig. 6 is a longitudinal section of'reiuforced concrete girder having curved compression member composed of cast or wrought iron or steel pieces articulated or jointed by ball and socket joints and a bolt running through its axis to hold said pieces in position and for putting initial compression into member; and a tension member of wrought ironor steel either of uniform or of varying sectional area. Fig. 7 is a transverse section of same on line 1111. Figs. 8 and 9 show modified forms of the compressionniember.

Referring to Fig. 1 of the drawings, 1 represents the concrete of the girder or beam, having embedded therein the cast iron compression member 2, which, in this instance,

is an articulated or jointed bar consisting of a number of short sections or spools 2, put together with straight joints on a bolt 3, which passes through their axes to hold them together while eing placed in position in the structure and also to give initial compression. The spools are preferably made of conical form and placed in such relation to one another that a shoulder is formed at the joint, which shoulder forms a grip or bond for the concrete.

As is well known, cast iron can resist a compressive strain of 1%,000 pounds to a square inch of cross sectional area, while that of the usual grade of steel or wrought iron is considerably less andnever over 10,000 pounds; thus it will be readily seen from this that great advantages as to weight and cost of reinforcing material to be employed are obtained when cast iron is used to resistthe compressive strains in reinforced concrete, as pointed out in this specification.

The lower or tension member 4: is preferably composed of wrought iron or steel of varying sectional area. and forms no part of my present invention. This member assumes the form of a taper bar or bars having its or their largest dimension at the middle, and tapering to smaller dimensions at the two ends, which are preferably bent upwardly as shown, for the purpose of anchoring. The use of a bar tapering from the middle to smaller dimensions at both ends is based on the fact that the greatest bending moment of a girder or beam occurs at its middle section; therefore the strength should be greatest at that point.

In Figs. 6 and 7 the same general conis curved and the articulated spools or short sections 5 are provided with ball and socket joints, to enable them to assume any curvature on the. positioning bar or rod 6, which is of the same construction and function as in Figs. 16. 6' are either uniform or varying in cross section, steel or wrought iron tension members.

From the foregoing description and illusing bar, while Fig. 9 shows the spools or articulated sections 13, provided with a circular flange 15, as indicated, for engaging the concrete when embedded therein.

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A reinforced concrete structure having an element to resist compression strains consisting of an articulated bar comprising a series of connected and abutting cast iron spools or sections.

2. A reinforced concrete structure having an element to resist compression strains consisting of an articulated bar comprising a series of connected and abutting cast iron spools or sections having ball and socket joints.

3. A reinforced concretestructure having an element to resist compression strains consisting of an articulated bar comprising a series of connected and abutting cast iron spools or sections each of which is a frustum of a cone in shape and so arranged that the smaller end of one is in juxtaposition to the larger end of the next spool or section.

4. A reinforced concrete structure having. an element to resist compression strains con sisting of an articulated bar of cast iron having a hole through its axis and a retaining or positioning bar inserted in said hole. 5

5. A reinforced concrete structure'having an element to resist compression consisting of an articulated bar of cast iron having a hole through its axis and a bolt inserted in said hole, said bolt being adaptedto put initial compression in the bar.

In testimony whereof I affix my signature in presence of two witnesses.

ROBERT MGLAUGHLIN.

Witnesses JAMES MCLAUGHLIN, THOMAS B. COOPER.

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