PNEUMATIC TUBULAR FORMWORK
Pneumatic tubular formwork, also called culvert balloon, is used for making concrete pre-casting formwork projects in culvert bridge construction.
Nigeria dia600mm inflatable rubber balloon for culvert construction (600mm diameters)
Material:
Pneumatic tubular formwork is made from natural rubber and fabric. In general, rubber balloon is formed by three layers(1+2=2layers of rubber and 1 layer fabric): inner layer is high strength synthetic polymer fabric withstanding the force from concrete and air pressure. Outer layer is vulcanized rubber. Rubber hardness is about 65Shore A to keep its exnt features, such as soft, durable,wear-resistance.
If your concrete slab is thicker, the rubber balloon should be manufactured in 2layers of fabric and 3layers of rubber(2+3).
Standard specification
diameter from 0.2m to 3m,(round)total length from 1m to 28m(round)other specifications are also available according to clients’ request.Technical Parameters
| Items | Index |
| Terence of Thickness, mm | 3.2±0.2 |
| Hardness(Shore A) | 65±5 |
| Adhesive tension of rubber and fabric,N/25mm | ≥8 |
| Tensile strength, M pa | ≥12 |
| Elongation at break, % | ≥350 |
| 300% Stretch set length, M Pa | 6 |
| Stretch for deformation ratio | ≤20 %(Prevent distortion) |
| Suitable temperature,°C | -10~80 |
| Appearance | No cracks, no bubbles on the surface;the length of impurities trace is not more than 3mm;the depth is not more than 1.5mm;the quantity of the trace is not more than one;the deformation is not more than 2mm. |
Working Pressure
| Diameter(mm) | Pressure(Mpa) |
| 150 | 0.08 |
| 160~190 | 0.08 |
| 200~220 | 0.07 |
| 230 | 0.06 |
| 240~280 | 0.05 |
| 300~370 | 0.045 |
| 380~480 | 0.04 |
| 500~520 | 0.035 |
| 550~600 | 0.03 |
| 620~680 | 0.025 |
| 700 | 0.02 |
Characters:
1)Design scientific and reasonable
Concrete culvert casting with pneumatic tubular form can meet the requirement of design, easy operation, save work, save time, save material.
2)Have good ageing resistance performance and long service life
Pneumatic tubular form is made from synthetic rubber, natural rubber and strengthen fabric, It has good strength, elasticity and flexibility, so it can be used in all kinds of working conditions.
3) Widely working temperature , -10℃~+80℃.
4)For building light-duty construction provides favorable conditions to stress hollow concrete component, due to the rubber mandrel, the weight than use stress solid component light 20%, so it can reducing the weight of the upper structure of building, can make the pile foundation short, increase span, make the construction become simple and safety.
5)Construction technology is simple, safe, health, use it only need a few simple tools, without special process.
