Of the orbits of the crane orbit commonly used types are: P18P22P24P38P43QU50QU70QU80QU100QU120, electric hoist orbit with i-steel 18-20. A, a 30 t, 30 a, b, 30, 32 a, 32 b, 45 a, 63 a, and so on

The cart track of the crane must be fixed on the beam, and the trolley track is fixed on the main beam. When the crane is running, the orbit cannot be moved horizontally and vertically, and the orbit is easy to adjust.

1. There are special rails, railway tracks, square rails and p-type rails for crane rails; The square rail is more worn to the wheel and is seldom used now; Crane large car mostly adopt P - type rail.

2. Selection of crane rails, as shown in the following table:

The fixed mode of crane rail on the main beam is mainly the following:

See figure, among them:

Rail connection mode

Rail connection mode

1, a figure USES the straight seam welding, is not detachable structure, track section stress can be included in the main girder stress, increase the bearing strength of girder, trolley track for job level under the M5.

2. Plan b is the most commonly used fixed method in China. It is convenient to assemble, but it is troublesome to remove.

3, c and d maps are applicable to the organization of work level M6, M7 and M8.

4. The e and f diagrams are connected by screws for special situations where the bottom is not easy to be bolted.

5. The g diagram is at the bottom of the track pad 3-6mm rubber, which can reduce the impact.

6. H diagram is a fixed method for circular orbits.

7. I graph is the way of large car rail fixed on the crane rail beam.

1. Safety inspection of the track: check the rails, bolts, splints for cracks, looseness and corrosion. If found cracks should be replaced in time, if any other defects should be repaired in time. The main inspection tool is used for circuit flaw detector.

2. Measurement and adjustment of the track:

(1) the linearity of orbit, wire method checks are available, and that is in orbit at opposite ends of a gear on a 0.5 mm steel wire, and then use the method of messenger wire hammer to point measurement, measuring point interval can be in 2 m or so.

(2) the elevation of the track can be measured by the level instrument.

(3) the span of the track can be inspected by a steel tape measure or an infrared measuring instrument. The allowable deviation of the bridge crane gauge is plus or minus 5mm. The longitudinal inclination of the track is 1/1500 and the relative elevation of the two tracks is 10mm.

(4) the rail joint, orbit can be made directly to the head, also can be made into 45 ° inclined joint Angle. The oblique connector can make the wheels move smoothly at the head. The gap of general joint is 1 ~ 2mm, in cold area should consider the influence of temperature to aperture, generally 4 ~ 6mm. The height of the two tracks at the head shall not be greater than 1mm.