Crane rails, railway rail and square steel. The top of the rail is convex, and the bottom is a plate with a certain width, which increases the contact surface with the foundation. The cross section of the track is mostly zigzag, with good bending strength. Square steel can be regarded as the flat top rail, because of the large wear of the wheel, generally used only for the small weight, slow speed, the work less frequent crane. Steel rail usually consists of carbon and manganese steel (C=015% ~ 018%, Mn=016% ~ 115%). The typical material of crane track is U71Mn steel. Square steel is mainly made of Q275 square or flat steel.
Crane rail is used as a special section rail for crane carts and small cars. The standard length is 9, 915, 10, 1015, 11, 1115, 12, 1215, etc. Common specifications are QU70, QU80, QU100, QU120, and the number behind QU indicates the width of the track head. Railway rail track and rail are divided into two kinds of rail and light rail. Rail, which weighs more than 30kg/m, belongs to heavy rail. The standard rail length is 12150m and 25100m. The light rail is not more than 30kg/m rail, usually 5 ~ 12m. Light rail steel, most of them are killed steel of ordinary carbon structural steel and half killed steel, in order to improve the wear resistance and corrosion resistance of steel, in recent years, use the alloy elements such as Mn, Si, P of the low alloy steel.
There are two kinds of rail beams used for installation of rails: one is steel structure beam and one is concrete prefabricated beam. The concrete precast beam must be embedded in the hole to be bolted for installation or in concrete
Embedded bolt in precast beam.The installation method of crane rails is used for fixed pressing plate, hook screw fixation, welding and bolting. In order to adjust the horizontal direction, the holes in the rail clamp are usually made of growth holes, and the adjustment of the vertical direction can be added under the rail. When designing, the rail pressure plate shall be rigid enough to form a single hole or double hole according to the size of the force. The gears can be soldered on the track only when the rails are connected to the rail beam or the fixed steel gasket on the rail beam.