Bridge crane track type and installation method

The track of the bridge crane is the foundation for the smooth operation of the crane. The track is generally installed together with the load-bearing beam by the steel structure factory installer. In order to let customers know more about the crane track, the editor of our factory introduces the type of bridge crane track and the method of installation and fixing:

1.  The top of the crane rail is made convex, and the bottom is a flat plate with a certain width to increase the contact surface with the foundation, which is currently widely used;
2.  The cross section of the railway track is I-shaped, with good bending strength.
3.  Square steel can be regarded as a flat-top steel rail, which is rarely used now because of the large wear to the wheels.

Crane rails are usually rolled from steel with higher carbon and manganese content.

The standards used for crane rails include YB/T 5055-1993 crane rails, GB 2585-2007 railway hot-rolled rails, and GB/T 11264-1989 light rails.

The track of the bridge crane should be installed firmly and in line with the track tolerance, so as to avoid the track problem of the bridge crane from gnawing the track .

The editor introduces the installation and fixing methods of the crane rails

In order to ensure the safe operation of the bridge crane, the trolley traveling track of the crane must be fixed on the traveling foundation, and the trolley traveling track is fixed on the main beam. When the crane is working, the track cannot move horizontally and longitudinally, and the track should be easy to adjust.

There are two commonly used track beams for installing tracks: one is a steel structure beam, and the other is a concrete precast beam.

The concrete precast beam must have pre-embedded holes to prepare for the installation of bolts, or pre-embedded bolts in the concrete precast beam.

Crane rail installation methods include pressure plate fixing, hook screw fixing, welding and bolt joint fixing, etc. In order to adjust the horizontal direction, the holes on the track pressing plate are usually made long holes, and the vertical adjustment can be padded under the rail. When designing the track pressure plate, it must have sufficient rigidity. Each pressure plate can be made into a single hole or a double hole according to the magnitude of the force.

The track installation of the bridge crane trolley must meet the following standards:

1.  The relative elevation deviation of the two tracks is less than 10mm, measured with a level
2.  Longitudinal inclination of track 1/1500
3.  The height deviation of the track joint is less than 1mm, measured with a steel ruler and feeler gauge
4.  The rail joints are misaligned to the left and right, with a deviation of <1mm, measured with a steel ruler and feeler gauge
5.  The joints of the two parallel rails are staggered, and the opening is ≥500mm, measured with a steel tape
6.  Track span deviation S≤10m, △S=±3mm; S>10m, △S= ± [3+0.25(S-10)]mm, maximum ≤15mm, measure the uniform height, the outer side of one side of the guide rail , The distance from the outer side of the guide rail on the other side, measured 3 times and averaged
7.  Track joint clearance is usually 1-2mm; in areas with a temperature difference of 20°C or 4-6mm during winter installation, use a feeler gauge to measure direct head or 45° diagonal joints
8.  Torsion ≤1.5mm
9.  Track bending deviation≤3mm
10.  The deviation between the actual centerline of the track and the actual centerline of the beam is ≤10mm, and is less than 50% of the thickness of the beam web, measured with a steel tape
11.  Wear of rail top and side surfaces (one side)≤3mm
12.  When small transverse cracks occur in the track, use fish plate to connect. Generally 4-6 fish plate connecting bolts. Longitudinal cracks and oblique cracks are scrapped.

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