Products rubber balloon with high tensile strength, elasticity, flexibility and tightness, when filled with compressed air, can meet a variety of conditions or pre-cast concrete structures that meet the design requirements. The product can meet the long and large diameter hollow member, shaped cross-section of the hollow member pouring requirements Simple to operate, lightweight, easy to use, with good anti-aging properties for a wide range of rubber balloon can be reused many times, can greatly reduce costs and improve the construction schedule. Rubber balloon is used for pouring concrete bridge project hollow components essential products. Can effectively reduce construction costs and speed up the construction progress. Cost reduction, the recycling rate is much higher than hard rubber balloon mold of recycling, even if the first rubber balloon technology to construction, the number of recycling is not less than 60 times, if used skillfully construction workers, cycle times between 80-110 times. Rubber balloon Use: 1, into the mold rubber balloon - the balloon traction to the steel cage, and the longitudinal seams facing up. 2, inflatable rubber balloon began. (1) Open the valve inflated to a predetermined pressure to close the valve. (2) should be alternately inflated shaped balloon until it reaches a predetermined pressure. 3, fixed (1) due to the vibrated concrete, the air bags to float, it must be up, down, left and right have to be fixed, plus compact overcome buoyancy. (2) General φ250mm airbag stirrup spacing 80cm. Such as diameter increased the stirrup spacing is reduced accordingly. 4, pouring concrete (1) pouring concrete technology and solid structural member is substantially the same. (2) the use of high frequency vibrators vibrated rod from both sides at the same time, prevent the balloon move around. (3) vibrators not touch the balloon tip to avoid puncture leak occurred. 5, after the removal of the balloon until initial setting of concrete, will balloon out of the balloon. (Open the bleed valve, remove the balloon from the time fixed by the construction conditions).