Cylindrical bag inflatable mandrel inflatable mandrel inflatable mandrel also known as bridge, rubber inflatable mandrel, is an expandable, contraction, strengthening layer of vulcanized rubber and fiber and made with high tensile strength, elasticity and tightness, used to form the cavity of the concrete structures, in the manufacture of hollow components, placed in the middle, and filled with compressed air, inflated and have sufficient strength to withstand the pressure of the concrete, can replace The original wooden mold, bamboo mold, steel, open the valve capsule that is, contraction, and can be drawn from the cavity of the capsule. 

 Core models inflatable points: easy to use, economical and durable, can be repeatedly used, uninflated soft shrinkage, arbitrary folded, curled. 

 Inflatable mandrel for pumping holes in reinforced concrete structures, including piles, roof trusses, roof column, beam, construction, hydraulic engineering (dock, berth, wharf) 

 Optional shape: round, oval, rectangular, arched, octagon, trapezoid. 

 Inflatable mandrel Cautions: 

 An inflatable mandrel, first check the reinforcement cage wire connector and rolled wire head shall not be bent toward the inner diameter direction to avoid pricks mandrel to form a leak phenomenon. Reinforcement cage before pouring concrete cushion at the bottom, and then rope the mandrel traction to the reinforced cage, and longitudinal seams facing up. 

 Note: mode to use when the balloon must brush the release agent, mold resistance in order to reduce pumping air bag is not allowed to use oil instead of the release agent, on the one hand, the oil on the rubber erosion, another oil will pollute the bars. With soap and water dilution, as the ideal mold release effect. Soap powder and water ratio is around 1:20 

 , Open the valve inflated to the required pressure to close the valve, should not exceed the pressure. 

 4, the shaped mandrel should be alternately inflated direct access to the required pressure. 

 5, will enter the reinforced cage of the mandrel to be fixed up and down about. Overcome the buoyancy and move around. 

 6, after the pouring of concrete, the use of vibrator from both sides simultaneously vibrated to prevent move around the mandrel. And the vibrator of the first paragraph is not contact with the mandrel, so as not to puncture the leak. 

 When the initial setting of concrete, open the rubber inflatable mandrel valve deflated, taking the mandrel can be. (Mold release time according to the construction of the custom) in general: When the toilet paper belly pressed the clear fingerprint before demoulding. 

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