Bolt hole crack prevention
For the cause of bolt hole cracks, according to the actual situation of the road maintenance work site, the prevention and treatment of bolt hole cracks can be considered from the following aspects: strengthening the maintenance and repair of the rail joints and maintaining the good condition of the rail joints. The amount of work on the line is on the connector. At the same time, the joint disease is also one of the main reasons for the formation of bolt hole cracks. The timely repair of low joints, dark pits, wrong teeth, etc., to maintain the smooth and overall state of the rail joints, can greatly eliminate the role of the wheel rail and reduce The maximum stress of the bolt hole wall reduces the generation of cracks in the hole wall and prolongs the service life of the bolt hole.
In actual work, it is necessary to strictly enforce the provisions on the torque value of joint bolts in the "Regulations". Keep the joints good and reduce the impact of the wheel and rail. By adding an elastic pad at the joint part, and timely replenishing and replacing the failed rubber pad, the impact of the train on the steel 1 rail can be reduced, the maximum stress of the bolt hole can be reduced, and the service life of the bolt hole can be prolonged.
The bolt holes are chamfered to remove burrs and sharp corners around the edge of the hole to eliminate the hidden danger of stress concentration. This is mainly for the newly replaced rails, especially for the road maintenance work area. When replacing the rail work, it should be carefully checked. For the bolt holes, there are burrs, sharp edges, sharp corners, etc., which should be eliminated with a file. In fact, the cause of bolt hole cracks is not unilateral, and is often the result of a combination of several factors. If the joints such as wrong teeth and emptying are often insufficient and the torque is insufficient, the bolt holes are combined with each other. When the train passes, the two work together, which easily causes damage to the bolt holes, and the bolt holes are prone to cracks.
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