This article looks at one of the most important types of black metal – steel reinforcement. Heat-resistant valves, chemically resistant fittings, smooth and grooved fittings of different brands – all this can be found in this article. Varieties of metal on this day there are so many. And it is clear – diversify the environment of metal, including metal, has already passed more than one stage. And for different needs and requirements are needed and different kinds of metal.

To begin with, that even such a simple form of rent as armature has many features. Of course, the main scope of the fittings – it's construction. With a wide the spread of concrete as a basic building component began to rise and production of valves. Valves smooth and corrugated, with different thicknesses and mechanical properties – all of this is extremely important in the construction such impressive facilities, which is a modern multi-storey buildings in which we live. A key function of reinforcing bars and their purpose – to complement the concrete structures.

The success of concrete as the main component in construction related, of course, with its low cost and surprising property: concrete and steel complement each other. Where conventional concrete would not survive the load, withstand steel, which is much better load transfer in tension and shear. A concrete is significantly more resistant to weather conditions and provides the compressive strength. Improving technology has gradually led to the fact that there was a need for more perfect metal. Then the company started production of valves, corresponding to the increased requirements for heat resistance and corrosion resistance. New stamps of reinforcing rods is much easier to tolerate high temperatures and almost collapse under the influence of aggressive environment of the time. It plays a very important role in high-tech building, when erected homes in dozens of floors, where every detail must endure the load for many years. Similarly, the increased resistance of the new material played a significant role if the "high-rise" there is a fire: ordinary concrete collapses on the temperature and the standard I-section may start to "curl up". But reinforced concrete structures of the latest generation of conventional fire not fear. The most durable grade fittings made from stainless steel, which has high viscosity and elasticity, and applied in other areas: automotive industry (production of body parts of vehicles), mining industries. In addition, the fittings used in road construction high quality. The famous German autobahns are made just by using concrete slabs, which use high-quality fixed fittings. The quality of this type of metal can use it and when irregular loads, and in cases where it is important to avoid structural damage due to metal fatigue. In conclusion we can say that now in Russia and in St. Petersburg in particular, practically all possible types of metal. Such companies as "Anta" produces and sells all kinds of metal and, in particular, the reinforcement in St. Petersburg for many years and are responsible suppliers. Supplied quality control and reputation of the firm will allow you to be sure that you get a proven product that will last.

Brief description of the cable APvV APvV Power cable is designed for transmission and distribution of electric power in stationary installations, the ac voltage 10, 20, 35 kV, 50 Hz for networks with isolated or grounded. Cable Construction APvV APvV power cable comes with an aluminum housing multiwire corresponding to class 2 according to gost 22483-77. Surface veins superimposed display of the extruded conductive peroksidosshitoy composition of polyethylene and polyethylene insulation peroksidnosshitogo. On the insulating layer is also superimposed screens: extruded conductive crosslinked polyethylene composition and Combined two-ply. The first layer of superimposed coil, made of conducting paper tape or conductive polymer tape thickness not less than 0,2 mm. The second layer is made of copper naviv wires with a nominal diameter 0,7-2,0 mm, over which is superimposed spiral copper tape with a minimum thickness of 0,1 mm and a width of not less than 8 mm. This is followed by separating layer of two strips of crepe paper or cable or rubberized fabric thickness of not less than 0,2 mm, as a protective element provides the shell of pvc plastic.

Technical and operational characteristics of the cable, power cable APvV APvV can be operated at ambient temperatures from -60 C to +50 C and a relative humidity of 98% at temperatures up to +35 C. In operating mode, the maximum allowable temperature for a long time of heating cable cores to + 90 C, while in emergency mode, or under overload conditions, its value may reach + 130 C (heating duration is not more than 8 hours per day and 1000 hours for the entire period of service). Short-circuit (up to 4 seconds), the maximum permissible temperature of conductors + 250 C and heating copper cable screen 35 C. Under the terms of nevozgoraemosti cable APvV its ultimate temperature of heating wires short-circuit is 400 C. Cable installation APvV without preheating at a temperature not below -15 C (for cables with pvc jacket) and not less than – 200C (for cables with plastic insulation). Minimum bend radius – 15 Dn, using special templates – 7,5 Dn (Dn – outer cable diameter). Building length cables stipulated in the order. The service life of cables APvV under normal operating conditions – 30 years old, lifetime warranty – 5 years. Scope APvV cable Power cable APvV used for fixed wiring in cable structures and industrial buildings, on roads without limitation difference levels. Allowed wiring in dry soils. With a single gasket APvV are self-extinguishing.