Patent GB-422010-A (GB)
Title: Improvements in metal and concrete building construction
IPC: E04B1/21
Filed: 1934-01-12
Abstract: 422,010. Reinforced-concrete beams; columns ; floors. LEE, D. H., Templecroft, Roehampton Gate, London. Jan. 12, 1934, No. 33290 /33. [Class 20 (iv)] The reinforcement for a reinforced-concrete beam for use with columns formed of one or more bars or sections enclosed in concrete comprises a member in the form of either a T-section 8, Figs. 1 and 2, or a pair of angles 27, Fig. 4, placed back to back, and stirrups 9 in the form of one-piece closed links are loosely suspended from this member so as to support additional reinforcing rods 10 and to encircle completely the whole reinforcement of the beam. The concrete column shown in Figs. 1 and 2 is reinforced by four bars or angles 1 laced together by diagonal bars 2 which may be welded or otherwise secured either inside or outside the members 1, and a spiral reinforcement 4 is also placed around the four angles 1. The T-section 8 is supported on angles 11 attached to the column angles 1 as shown in Fig. 1. A beam 12 in the form of a rolled section meets the column on the opposite side from the beam 7 and is supported on a bridge piece 13 carried by angles 14 from the column angles 1. A further beam 15, Fig. 2, of similar construction to the beam 7, meets the column at right-angles to the beams 7 and 12, and the T-section reinforcing member 16 thereof is attached to the beam 12 or to the column angles 1. Certain of the reinforcing rods 10 of the beam 7 are bent upwardly to constitute shear reinforcement 21 and are extended through the column so as to lie adjacent the beam 12 as shown at 22, Fig. 1. Rods 23 forming part of the longitudinal reinforcement 10 of the beam 7 may also be extended through the column between or around the column angles 1. The beam 7 may comprise part of a reinforced concrete floor embodying hollow blocks 25 as shown in Fig. 2, and transverse reinforcing rods 26 may be placed across the top of the beam 7 at the column. When the beam is provided with two angles 27 placed back to back as shown in Fig. 4, bars 28 are welded or otherwise secured between the angles and are bent downwardly to the level of the rods 10; additional reinforcing rods 29 are also provided adjacent the angles 27. The angles 27 may, alternatively, be placed with their vertical webs extending upwardly. In a modification, one or a pair of stiffening bars 39, Fig. 5, is welded to the T-section or angles 38 for the purpose of reducing the deflection of the beam pending casting of the concrete, and the beam may be additionally supported by a cable attached to the centre of the beam. For connecting two aligned beams which meet at a column, bridging-plates 50, Fig. 6, may be welded or otherwise secured over the top flanges of the T-sections or angles 48 of the two beams, and where additional beams meet at this point the bridge-plate may be of T or cruciform shape. The column angles shown in Fig. 6 are connected at intervals by plates 51 instead of by the bars 2 shown in Fig. 1. When the column is formed of a rolled metal section, which is subsequently encased in concrete, the reinforcement of the beams meeting the column may be passed either around the section or through holes in the section.