Cast precast hollow rubber balloon use

Cast precast hollow rubber balloon use cast precast hollow rubber balloon construction method before using inflatable mandrel, first check the steel cage wire connectors and wire rolling head can not be bent toward the inner diameter direction, in order to avoid pricks mandrel to form a leak phenomenon. 2, in order to guarantee the protection layer and the plate girder hollow portion size plate girder steel meet the design and specification requirements, to avoid the core module in the process of pouring concrete in the float, using the positioning fixed steel hoop 3, will enter the core of the steel cage up and down to be fixed mold. Overcome the buoyancy and move around. 4, after the mandrel in place, open the inlet valve, air compressor inflated. Inflatable control with pressure gauges to monitor pressure, mandrel inflation pressure in accordance with the model set. When the air pressure to use the pressure, the valves are closed to stop inflation. 5, when pouring concrete on both sides of the mandrel, should pay attention to symmetrical vibration from both sides to prevent the mandrel about displacement, when vibration can not touch the core module, to avoid damage. 6. After the initial setting of concrete, rubber inflatable mandrel open the bleed valve, you can extract the core mold.