An inflatable core mold is a rubber inner mold that can be inflated with compressed air to achieve the required geometric shape for bridge construction. Owing to the rapid development of domestic bridge construction in recent years, the inflatable core mold has gained widespread use due to its simplicity, cost-effectiveness, durability, and low construction costs, as well as fast progress in construction. Since the inflatable core mold is made of rubber, it can be softened, contracted, and easily folded or bent for convenient transportation when not inflated.
Our rubber inflatable core molds are made with high-strength canvas as the base material, coated with chloroprene and natural rubber on both sides, vulcanized and bonded together, offering high tensile strength, elasticity, and flexibility. The product can be used within a temperature range of -10℃ to 80℃, with no material change. After inflating with compressed air, it can replace traditional wooden, bamboo, and steel molds, and is reusable multiple times, serving as a cost-saving and time-saving concrete product accessory.
Rectangular inflatable inner molds are one of the commonly used types of inflatable inner molds, and are frequently seen in bridge engineering for rectangular hollow casting components.
1. Molding
Apply release agent evenly to the outer surface of the airbag mold.
B. Pull the气囊内模 through the rebar cage at the bottom, ensuring the inflation mouth is placed externally.
2. Inflatable
A. Open the intake valve to inflate; during inflation, use a pressure gauge to monitor the air pressure (the gauge is placed vertically).
B. Close the intake valve when the air pressure reaches the operating pressure. (See the airbag operating pressure chart below.)
C. Inflate the non-standard airbag mold alternately until the operating pressure is reached.
D, Do not over-inflate.
3. Set and pour concrete
A. During concrete vibration, the inflatable mold will float upwards, thus it must be secured vertically and horizontally. Generally, the spacing of the rebar for a 250mm inflatable mold is 80mm; if the diameter increases, the spacing should correspondingly decrease.
B. The method of casting concrete is basically the same as that for solid components. Pay attention to using a high-frequency rod or vibration rod to vibrate from both sides simultaneously to prevent lateral displacement of the气囊 mold. Do not let the end of the vibration rod touch the气囊 mold.
4. Demolding
As concrete begins to set, open the valve to release air, then the bladder form can be removed. The demolding time can be determined by the cement type.
5. Rinse capsules, perform pressure testing. Storage and maintenance of round inflatable core molds (airbag inserts)
A. After use, clean the inner mold of the airbag with clean water, store it in a ventilated and dry place when not in use, and avoid contact with oils, acids, or alkalis.
B. Avoid contact with sharp and hard objects during on-site use.
C. After each demolding, the inner mold of the airbag should be immediately cleaned with a brush (nylon brush) and tap water to remove the concrete on the surface and maintain the cleanliness of the inner mold.
If there is a leak in the airbag mold, if the sealing film falls off, it can be repaired by sanding the area in need and applying glue to cover the film. For fiber tears, use a patch to cover and repair the area.
