Rubber inflatable mandrel is an expansion, contraction cylindrical bag, used to form the cavity of the concrete structures, in the manufacture of hollow components, placed in the middle, and filled with compressed air, when the concrete solidification later, release the bag in compressed air, capsule contraction, and can be drawn from the cavity of the capsule. 

 Rubber inflatable mandrel for pumping holes in reinforced concrete structures, including piles, roof trusses, roof column, beam, underpasses and other structures, are widely used: industrial foundations, roads and bridges, construction engineering, hydraulic engineering (dock, berth, wharf ). 

 Rubber inflatable mandrel to use: 

 1, into the mold 

 Pulling the mandrel through the concrete reinforcement cage with a rope and inflatable mouth placed in the outside. 

 2, inflatable 

 A. Open the inlet valve to inflate the inflatable pressure control with pressure gauge monitoring. 

 B. When the pressure reaches a use of pressure, the intake valve closes. 

 C. Shaped mandrel should be alternately inflated until they reach the working pressure. 

 D. Overpressure must not pay attention to inflation. 

 3, and pouring concrete 

 A. The mandrel will go up in the vibration of concrete and must therefore be up, down, left and right to be fixed, general the φ250mm mandrel stirrup spacing of 80cm diameter increased, the fixed spacing corresponding narrowing. 

 B. The method of pouring concrete and solid components are basically the same, pay attention to the use of high-frequency insertion or vibrating rods from both sides at the same time vibrated to prevent the mandrel about displacement, vibration rod end parts is best not to touch the mandrel. 

 4, Chaimo 

 When the final setting of concrete, open the valve deflated the mandrel out time visualization of cement may be. 

 5, washing airbags, test the water to check 

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