2. The specifications of round steel are 6mm, 6.5mm, 8mm, 10mm, which can be cut according to the actual length.
3. The steel bar is nine meters long, with specifications of10mm,12mm,14mm,16mm,18mm, 20mm, 22mm, 25mm, 28mm, 32mm, etc.
Extended content: 1. Rebar refers to the steel used in reinforced concrete and prestressed reinforced concrete, and its cross section is round, sometimes square with rounded corners. Include round steel, ribbed steel bar and torsion steel bar. Steel bars are widely used in various building structures. Especially for large, heavy and light thin-walled and high-rise building structures.
2. Reinforced concrete structures are used in construction projects.
(1) 1849, French J.L. Rumbo and French J.Moniere painted cement mortar on both sides of barbed wire to make boats and flowerpots. 1884, the German construction company purchased Moniere's patent, and carried out the first batch of scientific experiments on reinforced concrete, and studied the strength and fire resistance of reinforced concrete, as well as the bonding force between steel bar and concrete.
(2) 1886, German engineer M. Kennen proposed the calculation method of reinforced concrete slab. At the same time, the British W.D. Wilkinson put forward the patent of reinforced concrete floor; T. Hai Ete, an American, experimented with concrete beams; Frenchman f kvani published a monograph on the application of reinforced concrete.
(3) In the late 1930s, the Soviet Union began to adopt the failure strength design method considering the plasticity of reinforced concrete in the failure stage;
(4) The limit state design method is further improved in 1950, which integrates the advantages of the first two design methods, not only checking the allowable stress, allowable crack width and deflection in the use stage, but also checking the bearing capacity in the failure stage. The concept is clear and comprehensive, and has been adopted by the design specifications of many countries and international organizations.
3. Other building materials:
1 ceramics
Exterior wall brick, interior wall brick, square mosaic, glazed tile, ceramic mold, ceramic raw materials, ceramic machinery.
(2) coating
Latex paint, water-based paint, nano-paint, universal paint for wood paint, automobile paint, architectural paint, marine paint, light industry paint, anticorrosive paint, paint, polyester paint, wood paint, nitrocellulose paint, polyurethane paint, antirust paint, waterproof paint, fireproof paint and bridge paint.
(3) Stone materials
Blank floor, environmental decoration, stone carving, stone furniture, special-shaped craft, tombstone, stone machinery.
(4) lock
Locks, door and window locks, electronic locks ic card locks, special locks, coded locks, car locks, safe locks, lock accessories.
5. Hardware
Building hardware, material hardware, mechanical hardware, spraying equipment, kitchen facilities, bathroom facilities, hardware accessories.
(6) lamps and lanterns
Indoor lamp, outdoor lamp, car lamp, stage lamp, special lamp, colored lamp, electric light source, lamp fittings.
(7) Soft porcelain
Soft porcelain natural stone, soft porcelain artistic stone, soft porcelain partition brick, soft porcelain exterior wall brick, soft porcelain checker brick, soft porcelain wood, soft porcelain skin, soft porcelain metal plate, soft porcelain thermal insulation decoration integrated plate, soft porcelain weaving, soft porcelain artwork.
(8) block
Ordinary brick, perforated brick, hollow brick, clay brick, coal gangue brick, baking-free brick, concrete block.
(9) Cement
Slag, cement, pozzolanic cement, ordinary cement, high-alumina cement, acid-resistant cement, white cement, early strength agent, antifreeze, dehydrating agent, calcium powder and ash powder.
(10) sandstone
Medium sand, fine sand, large sand, quartz sand, pebbles, bluestone.
(1 1) electrical materials
Electrical, wire and cable, cable bridge, welding material, switch socket, power supply, battery motor, transformer, inverter heat sink, heat exchanger, stair fittings, thermostat, heating equipment, refrigeration equipment, building electricity.
(12) pipeline industry
Special pipe for floor heating, oxygen barrier pipe, floor heating pipe, aluminum-plastic steady-state pipe, nano antibacterial pipe, fiber reinforced, polypropylene pipe.
(13) chemical materials
Grouting agent, cleaning agent, lubricating oil, adhesive, adhesive.
References:
Liba _ Baidu Encyclopedia?