1, rubber balloon design scientific and rational use rubber balloon, prefabricated or site pouring out of the finished hollow beam members, all to meet the design requirements, and simply rubber balloon operations, labor, save time, save material. 2, rubber balloon having a good aging resistance, long life characteristics of the rubber balloon synthetic rubber, natural rubber and fiber reinforced layer made of vulcanized. Very good resistance expansion strength, and elasticity, flexibility, rubber balloon can meet the construction in a variety of operating conditions. 3, rubber balloon wide application temperature in the range of -10 ℃ ~ + 90 ℃, the rubber balloon material does not change. 4, rubber balloon as a bridge, building site construction lighter and provide the necessary conditions for prestressed hollow concrete structures, the use of rubber balloon, lighter weight than non-prestressed solid component more than 20%, thereby lessening the upper structure of the building weight, pile can be shortened span increases, the construction site is safe and easy. 5, rubber balloon construction process is simple, safe, sanitary rubber balloon, with only a few simple tools, no special technology. As long as the rubber balloon into a steel cage, filling pressure up to operating pressure (on pressure gauge and manual), the pouring of concrete, to be the initial setting of concrete, the rubber balloon deflated drawn to complete the finished molding member, And rubber balloon does not pollute the environment.