US3604177A

US3604177A - Reenforced concrete building frame construction

Info

Publication number: US3604177A
Application number: US808532A
Authority: US
Inventors: Hugh Mary Clyne; Peter Joseph Faherty
Original assignee: Individual
Current assignee: Individual
Priority date: 1968-03-22
Filing date: 1969-03-19
Publication date: 1971-09-14
Anticipated expiration: 1988-09-14
Also published as: IE31993L; FR2004560A1; DE1914298A1; GB1266174A; IE31993B1

Abstract

In the reinforced concrete frame for a building consisting essentially of columns assembled with horizontal beams and with floor units extending between adjacent parallel beams, the beams and floor units are precast for assembly on the building site. According to the invention, in order to provide a simple but strong connection between the beams and columns a bracket consisting of a hollow steel joist section embedded in a column and projecting laterally is received within a channel-shaped steel shoe embedded in the end of the beam in interfitting relation on assembly of the beams and columns. To ensure accurate alignment and eliminate possible canting of the beam a second length of channel-shaped steel section is embedded in the column above said bracket and receives a tubular steel section secured to and projecting from the end of the beam upon assembly of the shoe and bracket. A stuff bar pushed through the tubular section may serve to connect two beams similarly supported on opposite sides of a column. The shoe and tubular section are welded to reinforcing bars, while floor units of double T-shaped cross section, the ends of which rest on flanges of the beams, are also secured by welding reinforcing elements thereof to reinforcing bars extending laterally from the beams.

Description

United States Patent [72] Inventors Hugh Mary Clyne 25, Sion Road, Glenageary; Peter Joseph Faherty, Park Avenue, Daleplort Road, Salthill, Galway, both of, Ireland [2].] Appl. No. 808,532 [22] Filed Mar. 19, 1969 [45] Patented Sept. 14, 1971 [32] Priority Mar. 22, 1968 [33] Ireland [31 335/68 [54] REENFORCED CONCRETE BUILDING FRAME CONSTRUCTION 5 Claims, 11 Drawing Figs.

[52] U.S. Cl 52/283, 52/250, 52/322, 52/491 [5 1] Int. Cl E04b 5/04, E04b 5/23 [50] Field of Search"; 52/236, 263, 283, 252, 251, 280, 721, 299, 253, 491, 587, 250, 322

[56] References Cited UNITED STATES PATENTS 2,569,669 10/195 I Henderson 52/238 2,970,676 2/l96l -Maciunas 52/280 Primary E.raminer.lohn E. Murtagh Attorney-Mason, Fenwick & Lawrence ABSTRACT: In the reinforced concrete frame for a building consisting essentially of columns assembled with horizontal beams and with floor units extending between adjacent parallel beams, the beams and floor units are precast for assembly on the building site. According to the invention, in order to provide a simple but strong connection between the beams and columns a bracket consisting of a hollow steel joist section embedded in a column and projecting laterally is received within a channel-shaped steel shoe embedded in the end of the beam in interfitting relation on assembly of the beams and columns. To ensure accurate alignment and eliminate possible canting of the beam a second length of channel-shaped steel section is embedded in the column above said bracket and receives a tubular steel section secured to and projecting from the end of the beam upon assembly of the shoe and bracket. A stuff bar pushed through the tubular section may serve to connect two beams similarly supported on opposite sides of a column. The shoe and tubular section are welded to reinforcing bars, while floor units of double T-shaped cross section, the ends of which rest on flanges of the beams, are also secured by welding reinforcing elements thereof to reinforcing bars extending laterally from the beams.

- PATENTED-SEPI 4:971

SHEET 1 BF 3 "YVE/VTORS HUGH MARY CLYNE Q PETER Iosapu FAHeR-w PATENIEU SEP] 4 1971 shin 3 or 3 V llVVEWTORS Huau MARY Vic-urns pews-z Josapu FAHE meu MJW REENFORCED CONCRETE BUILDING FRAME CONSTRUCTION This invention concerns improvements in the construction of reinforced concrete frames for buildings of the kind comprising columns which support the ends of transverse beams. which in turn are intended to carry the floor plates spanning from beam to beam, and is particularly concerned with frames for multistory buildings.

The object of the invention-is to simplify and improve the construction of the parts and to'facilitate their erection so that a strong and endurable structure may be obtained. For this purpose particular regard is paid to the manner of connecting together the parts which make up the framed structure;

In the construction of a building frame ofthe kind referred to employing beams which are precast and not cast in situ, it is usual to provide brackets upon the columns to receive and support the ends of the beams whichextendfrom column to column. According to one feature of the invention a bracket: upon a column to support the end of a beam'is constructed by a steel joist section which may be of inverted channel shape, but is preferably tubular, portion being embedded in the reinforced concrete column while a portion projects laterally to;

. ing.

FIG. 9 shows to a reduced scale and diagrammatically a suitable arrangement of the reinforcement provided in a beam and'in the end portion of a floor element resting thereon.

In some of the views partsof the reinforcement are. not shown for the sake of clarity.

Referring toth'e drawings, the reinforced concrete frame of a building accordingto the invention consists essentially of columns 1 and beams 2, the latter being bridged by floor members 3. A shear wall 4-(FlG. 10) also of reinforced concrete provide a step, over which will fit an inverted channel-shaped:

steel shoe which is at least partially embedded in the concrete of the end of the beam but is open of access on the underside. It is preferably welded to longitudinal reinforcement bars of the beam. If the column is intended to support beams on both sides thereof the bracket section passes, completely through the column, a portion projecting on opposite sides thereof to provide the beam supports.

According to a further feature of the invention means are provided at the end of the beam, spaced somewhat from the. shoe above referred to, and adapted to register with corresponding means provided upon the column to ensure a predetermined alignment and eliminate any possible twisting. or lateral tilting of the beam. Such means advantageously consist of interfitting steel members, preferably ashort length of channel-shaped or tubular rolled steel section embedded in the column with its longitudinal axis horizontal and with one or each end projecting laterally from the side of the column and adapted to cooperate in interfitting relation with a corresponding tubular or channel-shaped steel section cast in the end of the beam. The arrangement is such that when placing the end of a beam in position so that the shoe restsupon the bracket the beam is first suspended with its end more or less in contact with the column, but above the desired final position, and as the beam is lowered the shoe comes to rest upon the. bracket at the same time as the members constituting the registering means above referred to come togetherin nesting relation, one within the channel ofthe other. The floors of the building preferably consist of reinforced concrete members of double T-shaped cross section, the ends of which rest on laterally extending flanges of the beams, the latter having laterally projecting reinforcement bars-which are welded to the upper projecting portions of stirrups of reinforcement bars embedded in the end portions of said floor members.

The invention is hereinafter more fully described with reference to the accompanying drawings, wherein:

FIG. 1 is an isometric view of portion of the floor and frame ofa building as seen from below FIGS. 2,3 and 4 are similar isometric views showing respective portions of FIG. 1 in unassembled condition FIG. 5 is an isometric view from above of the end portion of the beam shown in FIG. 3,

FIG. 6 is a similar isometric view of a column and beam in assembled relation FIG. 7 is an isometric view corresponding to FIG. 2, but to a lar er scale showing in full lines the metal members embedded serves to stiffen the structure.

The columns 1 are of substantially T-shaped in horizontal cross .section, while the beams 2, at least those which. are located at the sides of the frame, are of L-shaped cross section so as to provide ledgesor rabbets to receive the ends of the floor plates 3. It willv be understood, however, that where horizontal beams are required to be arranged intermediately in the frame, to serve as so-called spine beams and are required to'support the ends of floor plates extending from both sides thereof, said beams will be of T-shaped cross section and arranged with the flanges at the bottom.

In order to connect the beams 2 with the columns I,

brackets or steps in the form of tubular steel sections 5 are partially embedded inthe columns 1, and where the columns are required to support beams 2 on both sides the sections 5 extend completely through the columns 1 and project on both sides as shown most clearly in FIG. 4. Spaced somewhat above the brackets 5 are further steel sections 6, preferably of U- shaped cross section. These are not required to support the weight of thebeams 2, andtherefore may be substantially smaller than the membersS.

In the end of the'beam 2 there is embedded at the bottom a shoe 7 of such size asto fit snugly over the bracket 5, while a second rolled steel tube portion 8 is disposed at the top of the beam 2 and is adapted to engage the section 6 when the shoe 7 engages the step 5 on placing the beam in its assembled position in relation to'the column 1 which is to support it. The sections 8 and 5 are preferably securely held in position at the end of the beam 2 by the provision of stirrups 9 (FIG. 7) welded thereto. 'The shoe 7 is also preferably welded to the longitudinal reinforcement bars 10 of the beam 2. When the beam is in the desired position a stuffing bar 11 is passed through the tubular member 8. It is advantageously welded to said member and also grouted to form a firm connection between the column 1 and the beams 2 on each side thereof.

The floor plates 3 are preferably of double T-shaped cross section, suitably reinforced and at their ends are provided with sole plates 12 adapted to sit upon corresponding bearing plates 13 provided on the flanges of the beam 2. The sole plates 12 may be welded to the bearing plates 13. The reinforcement in the end portions of the webs of the floor plates 3 preferably comprises stirrups 14, as shown in FIGS. 8 and 9, which at the bottom are welded to the sole plates 12 at the top project above the upper surface of the beam and are welded to reinforcement bars 15 provided for that purpose and extending laterally from the beam 2. Similarly where a floor plate 3 which is relatively easy to set up, a particularly strong andrigid frame is obtained and any twisting moments exerted on the beams due to d'eflection of the floor plates when loaded 1. In or for a building frame, a reinforced concrete column, a bracket consisting of a hollow steel section embedded in and projecting laterally from said column, a length of channelshaped steel section embedded in said column and projecting laterally therefrom above said bracket, a reinforced concrete beam for assembly with said column perpendicularly thereto, a steel shoe of inverted channel shape embedded in the end of said beam and open of access from below, a tubular steel section secured to and projecting from the end of the beam above said shoe, said shoe receiving said bracket in interfitting relation and said channel-shaped steel section receiving said tubular section in interfitting relation upon assembly of said column and beam.

2. In or for a building frame as claimed in claim 1, reinforcing bars extending as stirrups between and welded to the shoe and to the tubular steel section in the end portion of a beam, the beam also having longitudinal reinforcing bars welded to the shoe.

3 In or for a building frame, a reinforced concrete column, a bracket consisting of a hollow steel section embedded in and projecting laterally from said column, a length of channelshaped steel section embedded in said column and projecting laterally therefrom above said bracket, a reinforced concrete beam for assembly with said column perpendicularly thereto, a steel shoe of inverted channel shape embedded in the end of said beam and open of access from below, a tubular steel section secured to and projecting from the end of the beam above said shoe, said shoe receiving said bracket in interfitting relation and said channel-shaped steel section received said tubular steel section in interfitting relation upon assembly of said column and beam, and a stuff bar inserted through said tubular steel section for contract with said channel-shaped steel section and secured at opposite ends to the beam and column.

4. In a building frame a reinforced concrete column, a

' bracket consisting of a hollow steel section embedded in and projecting laterally from opposite sides of said column, a length of channel-shaped steel section embedded in and projecting laterally from opposite sides of said column above said bracket, a pair of reinforced concrete beams for assembly with said column perpendicularly thereto, a steel shoe of inverted channel shape embedded in the end of each of said beams and open of access from below, a tubular steel section secured to and projecting from the end of each beam above said shoe, each of said shoes receiving said bracket in interfitting relation and said channel-shaped steel section receiving each of said tubular steel sections in interfitting relationship upon assembly of said column and beams, and a stuff bar inserted through said tubular steel section and secured at opposite ends to the respective beams.

5. In a building frame as claimed in claim 4 a series of reinforced concrete beams and columns assembled together, said beams having bottom flanges extending laterally, reinforced concrete floor units of double T-shaped cross section supported at their ends upon said flanges and reinforcement bars extending laterally from the beams and welded to exposed portions of reinforcement bars partly embedded in the floor units.

Claims

1. In or for a building frame, a reinforced concrete column, a bracket consisting of a hollow steel section embedded in and projecting laterally from said column, a length of channel-shaped steel section embedded in said column and projecting laterally therefrom above said bracket, a reinforced concrete beam for assembly with said column perpendicularly thereto, a steel shoe of inverted channel shape embedded in the end of said beam and open of access from below, a tubular steel section secured to and projecting from the end of the beam above said shoe, said shoe receiving said bracket in interfitting relation and said channelshaped steel section receiving said tubular section in interfitting relation upon assembly of said column and beam.

3. In or for a building frame, a reinforced concrete column, a bracket consisting of a hollow steel section embedded in and projecting laterally from said column, a length of channel-shaped steel section embedded in said column and projecting laterally therefrom above said bracket, a reinforced concrete beam for assembly with said column perpendicularly thereto, a steel shoe of inverted channel shape embedded in the end of said beam and open of access from below, a tubular steel section secured to and projecting from the end of the beam above said shoe, said shoe receiving said bracket in interfitting relation and said channel-shaped steel section received said tubular steel section in interfitting relation upon assembly of said column and beam, and a stuff bar inserted through said tubular steel section for contract with said channel-shaped steel section and secured at opposite ends to the beam and column.

4. In a building frame a reinforced concrete column, a bracket consisting of a hollow steel section embedded in and projecting laterally from opposite sides of said column, a length of channel-shaped steel section embedded in and projecting laterally from opposite sides of said column above said bracket, a pair of reinforced concrete beams for assembly with said column perpendicularly thereto, a steel shoe of inverted channel shape embedded in the end of each of said beams and open of access from below, a tubular steel section secured to and projecting from the end of each beam above said shoe, each of said shoes receiving said bracket in interfitting relation and said channel-shaped steel section receiving each of said tubular steel sections in interfitting relationship upon assembly of said column and beams, and a stuff bar inserted through said tubular steel section and secured at opposite ends to the respective beams.