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Causes of rail joint disease
[Abstract]:
(1) After repairing the line, the track bed is unstable and changes rapidly, especially at the rail joint. If the maintenance can't keep up, the incidence of low joints will be greatly increased, which will cause the heads to collapse and crush injuries.
(2) The bed bed is muddy and slabted, and the joint 坍碴 causes the ball bed to decrease in elasticity, which causes the impact force on the joint of the train to increase. As time goes on, it is easy to produce a low buckle joint.
(3) The rail joint is large and the joint bolt is loose. When the train passes, the joint forms a chamfer, which increases the impact force of the train on the joint.
(4) The rail end fertilizer edge is not removed in time, and the rail end fertilizer edge is formed by rolling the train wheel to form the rail end peeling off the block, which invisibly causes the joint rail joint surface to be small. In fact, there is already a super large rail seam. The impact of the train wheels on the rail joints is increased, the rails are crawled, the rail gaps become uneven and the rail joint bolts are loosened, and the splint is loosened, which not only causes the joint disease and seriously endangers the driving safety.
(5) Due to the material of the rail and the splint and the looseness of the spare parts, the thickness of the track bed is insufficient and the curve is not high enough, the distance between the sleepers is not correct, and the track gap is not good, such as the maintenance is not timely, the centrifugal force is generated when the train enters the curve. Forming the joint nozzle, destroying the direction of the line, causing the deviation of the short-distance gauge to exceed the standard, causing the track to be uneven, changing the running track of the wheel and increasing the impact and damage of the wheel to the track. (The nozzles appear on the curve, especially the small radius curve, which also appears on the line.)
(6) The fat edge and the left and right wrong teeth on the side of the rail cause the track distance to be unsatisfactory, which changes the running track of the train wheel and destroys the stability of the track. It is one of the main culprits of water and disease.
(7) Reasons for rail material. Individual rails may be shipped from the factory. For various reasons, the rails are hard-bent and the joint quenching strength is lower than other standard rails. When the rails are changed, the vertical wear of the two rails is uneven, or the horizontal mats of the improper joints are unevenly distributed, and the uneven height of the rails is caused by the uneven lifting of the joints, which causes the train wheels to damage the joints greatly, resulting in joints. The empty crane is serious and the level of the rail is poor.
(8) Crushed stone ballast material and poor grade. Under the repeated action of the train load, the ball bed breaks the gravel, which causes the ballast plate knot to affect the quality of the maintenance work and affect the tamping effect.
(9) The position of the joint sleeper is not correct, and the train load can not be transmitted to the track bed and the roadbed in a balanced manner, resulting in uneven force on the left and right strands of the same joint.
(10) The super-high setting on the curve is unreasonable, and the gravity of the train intensifies the impact of the joint under the curve, resulting in a low buckle.
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Prevention and treatment of rail joint diseases