Inflatable Rubber Mandrel for Structure Weight Reduction

Inflatable rubber mandrel is similar to a marine airbag, but different in usage - that is to form cavities for large reinforced concrete structures including bridge, tunnels, roof, stake, roof board column, beam, building construction, irrigation works and water conservancy projects, etc. In this way, 20% weight of building structure is reduced than those with solid concrete structures. Meanwhile, inflatable rubber mandrels shorten the pipe foundation, increase span as well as provide a simpler and safer construction.

Inflatable rubber mandrels

Features:

• High strength to withstand the pressure of concrete when the mandrel is inflated.
• Quality synthetic rubber and natural rubber materials make the mandrel durable, long lasting, flexible and elastic.
• Save materials, time and efforts.
• Soft to fold, curly, contract and store.
• Various shapes including round, oval, rectangular, vaulted, trapezoidal, etc.
• Great resistance to aging and bulge.
• Wide applicable temperature ranging form 10°C to 90°C.


Shapes of inflatable rubber mandrels

• Easy and convenient to operate - only place mandrels into negative reinforcement cage, inflate them to appropriate work pressure, pour concrete and deflate the mandrels until the concrete is solid, then pull the capsule out.

Details:

• Diameter: 0.3m to 2.2m.
• Effective length: 6m to 24m.
• Total length: 7m to 40m.
• Custom design and sizes are also available upon your request.

Properties:

Properties of rubber inflatable rubber mandrel
Properties	Results
Hardness (Shore A)	65 ± 5
Adhesive tension of rubber and fabric	≥ 8 N/25mm
Tensile strength	≥ 12 Mpa
Elongation at break	≥ 350%
300% stretch set length	6 Mpa
Stress for deformation ratio	≤ 20%
Suitable temperature	-10°C ~80°C
Appearance	No cracks, no bubbles on the surface. The deformation is not more than 2mm.

Specification

Size	Thickness	Size	Thickness	Size	Thickness
Φ180mm	6mm - 20mm	Φ400mm	10mm - 40mm	350 × 530/540mm	10mm - 40mm
Φ200mm	10mm - 20mm	Φ500mm	10mm - 40mm	320 × 520/540mm	10mm - 40mm
Φ240mm	15mm - 40mm	Φ600mm	10mm - 40mm	350/360 × 560mm	10mm - 40mm
Φ300mm	15mm - 40mm	Φ620mm	10mm - 40mm	360 × 640/650mm	10mm - 40mm
Φ350mm	10mm - 40mm	Φ700mm	10mm - 40mm	350 × 520/550mm	10mm - 40mm

Mounted inflatable rubber mandrel before concreting.

Inflatable rubber mandrels form cavities after concreting.

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