Circular inflatable mandrel production pre-pressure water bag, has been widely used in the construction of railways, highways, bridges. 

 In the bridge construction phase, pre-pressure test of the bridge load is the key to work for an engineering quality standards testing. 

 The circular inflatable mandrel traditional approach is that the actual stress test cans or sandbags piled up on the bridge, to a large number of these items and load-bearing removal from the lower to the bridge, to pay a lot of manpower and resources. Less well in the construction site, more time-consuming to complete, to the use of heavy lifting and handling equipment, and there is a certain amount of staff labor safety hazards. Software collapsible water bag preload, the above issues will be resolved. The operator need only place the empty bag the site of preloading the weight of the empty bag to more than one hundred kilograms, easy handling, simple operation. Then pump water is full you can be tested. 

 Circular inflatable mandrel water bag test is simple, accurate, low cost and reusable features, it is an ideal choice for the future bridge preloading. 

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