Tarpaulin, rope net damage

In the section without windshield wall, when the maximum average wind speed reaches more than 31.5m/s, the truck tarpaulin, tarpaulin rope, and rope net are all damaged to varying degrees. (1) The X-type tarpaulin is torn seriously, and the lap joint of the tarpaulin is obviously driving. The D-type tarpaulin is partially damaged and torn due to friction and stress concentration, and the eye socket is pulled off. (2) The D-type tarpaulin rope is damaged, and the phenomenon of pulling occurs due to friction. Each D-type tarpaulin has 7 elastic ropes. In the third test, the non-elastic ropes of 2 vehicles were worn out; among the 6 vehicles that used elastic ropes, 5 vehicles had 10 elastic ropes. The tether of the rope was pulled out, the rubber rods of the two elastic ropes of 2 vehicles were disconnected, and only the elastic rope of 1 vehicle was not damaged. (3) The tarpaulin rope net has been seriously broken. In the third test, the tarpaulin rope nets of 8 out of 9 vehicles were worn out, but the worn-out parts were few, and the worn-out parts were generally on the protruding parts of the carriage. When the train passes through the section with the windshield wall (the maximum average wind speed is 34.8m/s), the wear of the truck tarpaulin, tarpaulin ropes and rope nets is significantly reduced, and only a small amount of tarpaulin ropes and rope nets are worn off. Comparison of tarpaulin rope forces under different loading methods The average value of the truck tarpaulin rope tension under different loading schemes measured in the test. (1) In the case of a corded or cordless net, whether it is a D-type tarpaulin or an X-type tarpaulin, when the cargo does not exceed the car, because the tarpaulin bracket is used inside the convertible to be overhead, the driving phenomenon is serious, so the tarpaulin rope is affected. The aerodynamic force is 10% to 20% larger than when the cargo exceeds the car gang but is less than 1m. (2) The tarpaulin rope net plays an important role in reducing the aerodynamic force of the tarpaulin rope. In most working conditions, the aerodynamic force of the tarpaulin rope is 30% to 40% larger than that of the rope net when there is no cordless net. (3) During a test, working condition 6 and working condition 2 occurred in the same place, the average wind speed of working condition 6 was 19.3m/s, and the average wind speed of working condition 2 was 21.9m/s. Among them, under the loading method of X-type tarpaulin with rope net, the windproof net is covered with the windproof net in working condition 6, and the windproof net is not covered in working condition 2, and the tarpaulin rope tension of working condition 6 is about 46% smaller than that of working condition 2; In the other five loading methods, the windproof net was not covered in working condition 6 and working condition 2, and the tarpaulin rope tension of working condition 6 was about 11% smaller than that of working condition 2. The windproof net can reduce the tension of the tarpaulin rope by 30% to 40%. 1. The main technical indicators of the D-type tarpaulin are better than the X-type tarpaulin. The X-type tarpaulin should be eliminated and the D-type tarpaulin should be vigorously developed, which can not only ensure the transportation, but also significantly save the tarpaulin purchase capital and the cost of thatch cover. 2. Under the conditions of the maximum instantaneous wind speed of 40m/s (level 13) and the average wind speed of 35m/s (level 12), the maximum tensile force of the tarpaulin rope and rope net and the maximum stress of the tarpaulin are less than the allowable values. The strength index of the tarpaulin can meet the requirements of train operation. 3. In the test in the strong wind area, the windbreak wall and the windbreak net can effectively reduce the aerodynamic force on the tarpaulin rope of the truck. In the strong wind area, in order to ensure the transportation, it is necessary to build the windbreak wall and the windbreak net. 4. When the maximum average wind speed is above 31.5m/s, whether it is D-type tarpaulin, X-type tarpaulin, or tarpaulin ropes, rope nets are damaged to varying degrees, which may affect transportation. You can refer to the test results to improve the driving organization method under strong wind conditions. 5. The tarpaulin rope net can effectively reduce the aerodynamic force of the tarpaulin rope to ensure transportation. 6. The elastic rope can effectively solve the problem of loose tarpaulin caused by the settlement of goods, but the quality of the elastic rope needs to be strengthened. The key is to avoid the situation that the elastic rod is pulled out or disconnected. Change to 100 ~ 150mm.

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