US1407277A - Concrete column cap - Google Patents

Description

S. H. IN GBERG.

CONCRETE column CAP. APPLICATION FlLED- MAY 21, 1920-" 1,407,271 Paitented Feb. 21, 1,922.

2 SHEETS-SHEET 1- S. H. INGBERG.

CONCRETE COLUMN CAP.

APPLICATION FILED MAY 2! Patented Feb. 21, '1922.

2 SHEETS-SHEET 2.

A'INT orrics. I

SIMON H. INGBERG, OF ELMHUBIST, ILLINOIS..

CONCRETE COLUMN GAP.

1920. Serial No. 383,072.

(nnmcarnn TO THE PUBLIC.)

cated to the free use of the Government ofv the United States and the public.

My invention relates to the details used for connecting columns and floor beams in timber building construction and has for its object to provide adequate and fire-resistive supports, in the form of reinforced concrete post caps, for connecting the columns of one 7 building story with those above or below, as well as to provide by the same means adequate and fire-resistivesupports for the floor members framing into the caps near the columns.

In the accompanying drawings, which form a part of this specification, Figure 1 is a longitudinal section through the center of the two-way reinforced concrete post cap taken on the line 1--1 of Figure 2;

Figure 2 is a cross section taken on the line 22 of Figure 1;

Figure 3 is a section through a portion of a timber floor construction, taken at theface of the columns on the line 3-3, Fig. 2, showing the two-way reniforced concrete post cap in place with reference to the other building members;

Figure 4 is an isometric view of the fourway reinforced concrete post cap.

Similar letters refer to similar parts throughout the several views.

Referring to Figures 1, 2 and 3, the central slab,A, supports the columns B and B on its lower and upper surface, respectively, and on the outer portions of its upper surface, the floor beams, C. Portions of the load reactions from the beams, C, and the bending strains induced by them are transferred by shear to the outer ribs, D. The slab, A, and ribs, D, constituting the body of the post cap, are made of Portland cement concrete or other suitable fire-resistive" material having the required mechanical strength. The slab, A, is reinforced with welded or expanded metal mesh. Thebars, G, are added to give the required rigidity to the reinforcing frame, prior to embedment in the body material of thecap. The reinforcing frame is supported in a mold of the required shape, which is filled with the body material, preferably in one continuous operation. On hardening of the filling, the reinforcing elements are firmly gripped and the two materials act ineffective combination to resist the stresses and strains imposed on the cap by the beam and column loads.

Suitable recesses, H, are formed in the ribs, D, through which lag screws, I, (Fig. 3) are threaded into the column and beam "ends to give added regidity to the construction.

The four-way cap shown in Figure 4 is made to receive floor beams on four sides, the ends of the beams being sup-ported'on the upper surface of the outer ends of the slabs, A The columns bear against the lower and upper surfaces of the common central portion of the slabs, A their ends being contained within pockets formed inside of the ribs, D. The latter serve the same purpose as the ribs, D, of the two-way cap and the reinforcing details of the slabs and ribs are in effect the same in the fourway cap as described for the two-way cap.

By making the post caps of Portland cement concrete or other similarfire-resistive material, very little heat from a surrounding fire will be transmitted by the cap into the beam and column bearings,and the latter will remain intact until the fire is exings soft and yielding, which results in failure at the bearing, due to cracking or slipping at the cap, before the fire-resistance of the columnoutside of the cap has been fully developed. The combination of design and material that obviates failure at the bearings in case of exposure of the cap to fire, is an important part of my invention.

Having thus described my invention what. I claimis:

1. In a cap for timber columns, the combination of intimately connected members of Portland cement concrete or other similar fire-resistive material, consisting of a hori- Specification of Letters Patent. Patented F b, 21 .jggg

Application filed ma 21,

zontal slab for receiving the timber column 7 and beam ends, vertical side rios extending above and below sald slab, connecting mem bers extending below sald slab and between sald ribs; and systems of reinforcing bars embedded in sald slab, ribs, and connectmg Vmembers.

2. In a cap for timber columns, the combination of intimately connected members of Portland cement concrete or other similar fire-resistive material, consisting of a horizontal slab for receiving the timber column and beam ends, vertical side ribs extending above and below said slab, connecting mem- V bearing surfaces against undue heating from a possible surrounding fire.

3. In timber building construction, the combination of timber columns and timber floor members; a reinforced concrete column cap into which said columns and floor members are framed; said cap being formed of intimately connected members composed of Portland cement concrete or other similar fire-resistive material and consisting of a horizontal slab, vertical ribs, intermediate connecting members, and systems ofreinforcing bars embedded in said slab, ribs, and connecting'members; said slab, ribs and connecting members being arranged above, below and at the sides of said timber column and beam ends, thereby being adapted to c protect their timber bearing surfaces against undue heating from a possible surrounding fire.

SIMON INGBERG.

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