Abstract:
The invention pertains to the production of cables and can be used for reinforcing single-block constructions and other articles made of concrete. The purpose of the invention is to create a self-rectifying reinforcing member. The reinforcement cable comprises a central wire and layer-forming wires spirally wound around the same and having a periodical profile. A periodical profile is applied on the outer section of the surface of the layer-forming wires and is made in the form of inclined protrusions above the generatrix of the crimped surface of the cable. The sections of the surface of the layer-forming wires in contact with other wires are made in the form of spirally-arranged planar flats. The cable is secured at the base of the structure and is attached upon each casting cycle between the previously-formed portion of the structure and a distribution matrix. The cable is supplied via bypass rollers and a guiding trough from reels arranged at the base. Before each casting cycle, the matrix is moved by a distance corresponding to a section to be formed. Each reinforcing member is integral along the entire length of the structure. The connection of perpendicular members is made using inserts or a tie wire.
Abstract:
A helical cord having an elliptical shape and the like is manufactured so that a length-to-width ratio or a dimension of a shaped form of the cord to be shaped in a longitudinal direction can be changed. A cord (C) is sequentially passed through through holes (21H, 22H) of stationary and movable shaping bodies (21, 22) opposing each other of a shaping device (20). At that time, the movable shaping body (22) is moved along the stationary shaping body (21) by a moving device so that the through holes (21H, 22H) become eccentric with respect to each other, and the cord (C) passing between the eccentric through holes (21H, 22H) is bent and deformed so as to be shaped. Also, a first and a second displacement mechanism that displace the movable shaping body (22) in X- and Y-directions are provided in the moving device, the movable shaping body (22) is thereby reciprocatingly displaced in the both directions in synchronization by displacement amounts which were set, respectively, the movable shaping body (22) is continuously moved in response to the displacements in the both directions, and thus the passing cord (C) is shaped.
Abstract:
A rubber-steel cord composite is provided having nonlinear physical properties even in a rubber characterized by incompressive properties after vulcanization, and hence the rubber-steel cord composite can show low rigidity and flexible properties in a low-strain region and, on the other hand, can show high rigidity in a high-strain region. The rubber-steel cord composite is provided by bundling steel linear objects 1 subjected to spiral shape forming at substantially identical pitches in an approximately identical phase without twisting, the steel cord being embedded in rubber.
Abstract:
The present invention aims to provide a polypropylene fiber (PP fiber) excellent in strength, heat resistance, and water-absorption properties, a method of producing the same, and a hydraulic composition, a rope, a sheet-shaped fiber structure, and a composite material with an organic polymer each using the PP fiber. The present invention provides: a PP fiber having a fiber strength of 7 cN/dtex or more and having either or both of (i) DSC properties such that the endothermic peak shape by DSC is a single shape having a half width of 10° C. or lower and the melt enthalpy change (AH) is 125 J/g and (ii) irregular properties such that the single fiber fineness is 0.1 to 3 dtex and irregularities are formed on the surface, the irregularities having an average interval of 6.5 to 20 μm and an average height of 0.35 to 1 μm as a result of alternate presence of a protruded portion having a large diameter and a non-protruded portion having a small diameter along its fiber axis; a method of producing the PP fiber by pre-drawing an undrawn PP fiber having an IPF of 94% or more at 120 to 150° C. at a drawing magnification of 3 to 10 times, and then post-drawing the resultant at 170 to 190° C. and a drawing magnification of 1.2 to 3.0 times under the conditions of a deformation rate of 1.5 to 15 times/min and a draw tension of 1.0 to 2.5 cN/dtex; and a hydraulic composition, a rope, a sheet-shaped fiber structure, and a composite material with an organic polymer each using the PP fiber.
Abstract:
A metal cord includes at least one preformed elementary metal wire. The metal cord has an elongation at break, measured on the bare cord, higher than or equal to 3%, preferably 4% to 6%; an elongation at break, measured on the rubberized and vulcanized cord, which differs in an amount not higher than or equal to 15%, preferably 2% to 10% with respect to the elongation at break measured on the bare cord; a part load elongation, measured on the bare cord, higher than or equal to 0.4%, preferably 0.5% to 1.5%; a part load elongation, measured on the rubberized and vulcanized cord, which differs in an amount not higher than or equal to 15%, preferably 0.5% to 10%, with respect to the part load elongation measured on the bare cord.
Abstract:
A reinforcing steel cord for rubber products, such as steel belted radial tires or conveyor belts, is disclosed. This steel cord is improved in rubber penetration and ageing adhesive force relative to the rubber material. The steel cord is formed by twisting a plurality of brass coated external element wires around a flat and spirally twisted core, with the twisted direction of the core being the same as or opposite to that of the resulting steel cord. In the steel cord, the pitch of the twisted core is set to allow the core to be twisted 0.2 to 2 times within the pitch of the cord, thus preferably forming sufficient interspaces between the core and the external wires in addition to the interspaces between the external wires. Since the rubber material is completely filled in the steel cord due to such interspaces, the steel cord is remarkably improved in buckling fatigue resistance, rubber penetration, air permeability, rubber adhesive force, ageing adhesive force relative to rubber, protection of brass coated surfaces of wires, and workability during a process of producing rubber products. The steel cords of this invention are most preferably used as a reinforcing material for steel belted radial tires.
Abstract:
A steel structure adapted for the reinforcement of elastomeric members has steel elements containing a plurality of steel filaments at least one of which filaments is provided with first and second crimps. The first crimp lies in a plane that is substantially different from the plane of the second crimp. Application of the both crimps can be carried out efficiently using two pairs of toothed wheels which are not externally driven. This arrangement renders it possible to obtain steel structures with an increased penetration of rubber or with an increased elongation at break.
Abstract:
A steel structure adapted for the reinforcement of elastomeric members has steel elements containing a plurality of steel filaments at least one of which filaments is provided with first and second crimps. The first crimp lies in a plane that is substantially different from the plane of the second crimp. Application of the both crimps can be carried out efficiently using two pairs of toothed wheels which are not externally driven. This arrangement renders it possible to obtain steel structures with an increased penetration of rubber or with an increased elongation at break.
Abstract:
A steel cord for reinforcing a rubber product has a multilayer structure consisting of two or more layers including a core, or a structure consisting of seven or more strands twisted in the same direction at the same pitch. In the steel cord, at least one of three strands that are successively adjacent to one another or that are in mutual contact is formed of two filaments that are paired substantially parallel to each other. The direction of pairing the two filaments of each strand is substantially the same over the entire length of the cord. Each of the remaining strands is formed of a single filament.
Abstract:
A high tensile steel strand for civil engineering applications comprises a core wire (11) and a ring of outer wires (12) arranged in a helical pattern around the core wire and in contact with the core wire. The number and the diameter of the outer wires in relation to the core wire are such that there are significant gaps (13) between adjacent outer wires. The strand is used as an anchorage in rock and a bonding agent between the strand and the rock penetrates gaps (13) to provide effective bonding. The strand is sufficiently flexible to be inserted in deep bores in rock even when surrounding space does not permit straight insertion of the strand.