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* GB786204 (A)

Description: GB786204 (A) ? 1957-11-13

Improvements in or relating to reinforced concrete beams

Description of GB786204 (A)

PATENT SPECIFICATION Date of filing Complete Specification: Jan 27, 1956. Application Date: Nov 1, 1954 No 31504/54. Complete Specification Published: Nov 13, 1957. Index at Acceptance -Class 20 ( 4), D 2, F 1, G( 1:3 14), N 10. International Classification:-E 04 b, c, f. COMPLETE SPECIFICATION. Improvements in or relating to Reinforced Concrete Beams. I, HAROLD DESMOND ROBERT RIDGEON, of Gloucester Street, Cambridge, a British Subject, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to reinforced concrete beams, and is particularly concerned with an improved construction of beam for use in flooring, ceiling or roof constructions embodying slabs supported by and extending bteween parallel beams and a filling of concrete applied in spaces between the slabs and beams to form a unitary structure on which a floor surfacing of any suitable kind can be applied. The invention has for its object to provide an improved construction of reinforced concrete beam for this purpose which, while possessing adequate inherent strength to support the load, is sufficiently light in weight to facilitate handling. According to the present invention, there is provided a reinforced concrete beam of inverted T-section, in which a horizontal bottom part of the section of concrete incorporates a bottom central longitudinal metal reinforcing member, and the web portion of the section comprises an adulatory metal reinforcing member connected to the bottom central reinforcing member and to a top longitudinal reinforcing member to provide a substantially triangulated truss structure, the edge portions of the concrete, forming the horizontal bottom part of the section, providing supporting ledges for flooring slabs so that the vertical web portion of the beam extends upwardly between and spaced from adjacent slabs The undulatory reinforcing member preferably is connected to the top and bottom longitudinal reinforcing members by welding. The concrete bottom part of the section may incorporate outer longitudinal reinforcing members extending within said edge portions, and the central and outer reinforcing members in the bottom part of the section may be connected at intervals by transverse reinforcing members The top reinforcing member and the outer reinforcing members in the bottom part of the section also may be linked together at intervals by transverse members of inverted V or U formation The transverse members may be connected to the longitudinal reinforcing members by means of wire bindings. If desired, the beam may be pre-stressed, at the bottom of the section for loading and at the top of the section for handling, the pre-stressing being applied to the said longitudinal reinforcing members or to additional pre-stressing elements. The invention is hereinafter described, by way of example, with reference to the accompanying diagrammatic drawings, in which:Fig 1 is a perspective view showing the reinforcing structure of part of a reinforced concrete beam according to the invention before the concrete is applied; Fig 2 is a perspective view of a portion of a finished beam; Fig 3 is a section on the line III-III of Fig 1 showing also the concrete bottom part of the section and the manner in which slabs are supported by the beam; and Fig 4 is a section on the line IV-IV, Fig 1. In carrying the invention into effect according to one embodiment, and with reference to the accompanying diagrammatic drawings, a reinforced concrete beam according to the invention is of inverted Tsection A horizontal bottom part 1 of the section is of concrete incorporating a bottom 786,204 65. central longitudinal metal reinforcing member 2 and the web Dortion of the section comprises an undulatory metal reinforcing member 3 connected, preferably by welding, to the bottom central member 2 and an upper longitudinal reinforcing member 4 to provide a substantially triangulated truss structure which imparts strength and stiffness to the beam while retaining lightness of weight. The bottom concrete Dart 1 of the section preferably incorporates outer longitudinal reinforcing members 5 spaced from the central member 2 and dis Dosed substantially on the same level The bottom central member 2 and outer members 5 may be connected at intervals by transverse reinforcing members 6 each of which, as shown in Fig 4, may extend beneath the members 2 and 5 and have upturned ends 6 a extending at the outer side of the members 5, the members 6 being secured to the longitudinal members 2 and 5 by wire bindings 7. The top reinforcing member 4 and the outer reinforcing members 5 in the bottom part 1 of the section also may be linked together at intervals by transverse stirrup members 8 of inverted V or U formation which members 8, as shown in Fig 3, may extend over the top of the member 4 and have U-shaped end portions 8 a for engaging the members 5 The transverse members 8 may be secured to the longitudinal members 4 and 5 by wire bindings 9 and provide shear reinforcement. The concrete bottom part 1 of the section is formed at its edge portions with ledges la for the support of flooring slabs 10, as shown in Fig 3, with the vertical web portion of the beam extending upwardly between and spaced from adjacent slabs The vertical web portion of the beam section is of such height as to extend substantially level with the top of the flooring slabs 10. The longitudinal reinforcing members preferably are of round section iron or steel, or may be of any other suitable section. The transverse reinforcing members also may be of round section rod or the like. Furthermore, the upper and/or lower longitudinal reinforcing members, or separate wire or other tension members incorporated in the concrete part of the structure, may be pre-stressed if desired. The improved beam according to the invention is of particular utility for use in combination with floor or ceiling slabs according to Patent Specification No. 750,146. It will be understood that the invention is not limited to the particular embodiment hereinbefore described For example, the web portion of the section may be encased in concrete to form a concrete web portion which may be formed with holes in intervals for lightness and may be provided with buttresses incorporating the reinforcing members of inverted V or U formation connecting the top reinforcing member and the outer reinforcing members in the bottom part of the section.

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* GB786205 (A)

Description: GB786205 (A) ? 1957-11-13

Improvements in submarine electric cables

Description of GB786205 (A)

PATENT SPECIFICATION 71 Inventors: -ARTHUR LENNOX MEYERS and ERNEST HAROLD PULL. Date of flling Complete Specification: Feb 6,1956. Application Date: Nov 4, 1954 No 31973/54 Complete Specification Published: Nov 13, 195,1. Index at Acceptance:-Class 36, A 1 C. International Classification:-H Olb. COMPLETE SPECIFICATION. Improvements in Submarine Electric Cables. We, SUBMARINE CABLES LIMITED, a Company organised under the laws of Great Britain, of 22 Old Broad Street, London, E.C 2, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- Submarine electric communication cables of the well-known coaxial type comprise a centre conductor, an extruded insulation normally of a polyethylene compound, -a series of copper tapes which form an outer or return conductor, protective wrappings and finally wire armour. A normal construction for the outer conductor is a layer of long lay copper tapes, for example, six in number, applied directly to the surface of the insulation and forming substantially a closed cylinder surrounding it, over which structure is applied a short lay copper binding tape, for example, of width 1 " 3 and thickness 0003 or O 004 inch. It has in the past been the practice to apply directly over this copper binding tape an overlapping impregnated and coated fabric tape for the triple purposes of adding mechanical strength, of limiting undesirable electrolytic action between the copper tapes and the armour wires, and of adding protection to the insulation This impregnated and coated fabric tape prevents excessive electrolytic action between the copper tapes and the galvanised steel armouring wires by interposing a barrier of appreciable electrical resistance, thereby limiting the flow of electrolytic currents in the sea water which penetrates into the outer layers of the cable. It is valuable as a protection of the insulation because it is highly desirable that tarry compounds used in the superimposed protective jute servings should not be in direct contact with the insulation The

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