Bolster loads

Bolster load with overhang over fourth car is acceptable. A brakewheel must be used in at least 1 of every 3 cars. 

Bolstered loads using equalizing transporting beams This method is much the same as the bolstered, long vessel load. In this case the load is too heavy for a flatbed, yet too short for bolstered axles. The solution is to utilize beams between bolsters to suspend the load. 

There are two types of stability checks that should be performed on each load. The first has to do with the tipping point of the load relative to the roadway as the load shifts due to the camber of the road. The second has to do with the turning radius of bolstered loads. As the load goes around curves, the C.G. shifts from being in line with the dollies, to an eccentric condition. In tight curves the... 

For bolstered loads, the vessel must swivel on the deck of the trailer in order to accommodate curves in the road and corners. As the curve or comer is negotiated, the actual CG gets further away from the projected load point. This is true whether you have a single pivoting bolster or two, however the situation is more pronounced with the double pivoting case. There have been a number of rollovers as a result of the eccentricity, ie, shifting the load to the outer row of wheels until the load becomes unstable. 

The test is carried out in compression by placing the test piece in a special bolster into which sits a close-fitting punch that bears against the test piece surface. The jig is placed in a universal testing machine and the load on the punch is increased so as to cause failure in the test pieee within 15 to 45 seconds from first application of the load. 

Do not anchor the saddle plate to the bolster plate or the railway bed. The saddle plate must be free to rotate on the bolster plate. Only the bolster plate is anchored to the railway bed. The most common means of anchoring the bolster plate to the railway bed is welding. Design anchorage for a load of... 

Bolstered This method is used for abnormally long loads in which the sets of axles are attached directly to the load via the transport saddle. Both sets of axles will have steering capabilities. 

Load pipe on bolsters and tie down with suitable chain at the bolsters. In hauling long pipe, an additional chain should be provided in the middle. 

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