Inflatable Rubber Mandrel & Mold

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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