Inflatable rubber mandrel is a kind of cylinder bag that can expand, shrink, used to form concrete component of cavity.  it is usually used in reinforced concrete members, bridge construction, irrigation works and tunnels,such as stake, roof, roof board column, beam, building, water conservancy project(shipyards, slipway, dock).
Specification of Rubber core moldÂ
1> Diameter (D)Â Â Â : From 0.3m to 2.2 m.
2>Total Length (TL) :Â From 7m to28m.
common size |
Special size |
|
¢180mm X 6-20m |
¢400mm X 10-40m |
350 X 530(540)mm X 10-40m |
¢200(¢220)mm X 10-20m |
¢500mm X 10-40m |
320Â XÂ 520(540)Â XÂ 10-40m |
¢240(¢250)mm X 15-40m |
¢600mm X 10-40m |
350(360) X 560mm X 10-40m |
¢300(¢330)mm X 15-40m |
¢620mm X 10-40m |
360 X 640(650)mm X 10-40m |
¢350(¢360)mm X 10-40m |
¢700mm X 10-40m |
320 X 520(550)mm X 10-40m |
Other specification also available upon customer's request. | ||
Shapes
Round, rectangular, octagonal etc.
Schematic cross section for pneumatic rubber core mode:
Technical parameters Rubber core mold 
| Dia(mm) | Pressure (MPa) |
| 80 | 0.12 |
| 120 | 0.10 |
| 150 | 0.08 |
| 200 | 0.07 |
| 250 | 0.05 |
| 400 | 0.04 |
| 500 | 0.035 |
| 600 | 0.03 |
| 700 | 0.027 |
| 800 | 0.026 |
| 900 | 0.025 |
| 2200 | 0.005 |
Performance characteristics:
1. Rubber inflatable mandrel has scientific design, the operation is simple, labor-saving, time-saving and    material-saving.
2. It has good aging resistance, long service life, which is made of synthetic rubber, natural rubber and reinforced layer and has good anti-expansion strength, elasticity and flexibility, so it can be used under various working conditions.
3. The applicable temperature is widely in the range of -10 ° C ~ +90 ° C, the material has not changed.
4. It provides favorable conditions for the lightweight construction of the construction site to stress the hollow concrete members.Â
5. construction process is simple, safe, sanitary use of rubber mandrel, only a small number of simple tools, no special process.
As long as the core is molded into the negative reinforcement cage and the inflation pressure reaches the working pressure, the concrete is poured. When the concrete is initially set, the core mold is vented and extracted, and the finished component can be formed without polluting the environment.
Construction method
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1. Place the mandrel into the steel cage with the longitudinal joint facing up, inflate to the specified pressure, and close the valve. When lifting the concrete, the upper, lower, left and right sides must be fixed according to the construction process, and the template is used to pressurize the screw to overcome the floating.
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2, pouring concrete using high-frequency plug-in vibrator, vibrating from both sides at the same time, to prevent the mandrel from shifting left and right, the end of the vibrator can not touch the mandrel, so as not to break through the air.
Â
3. After the concrete is initially set, the core mold can be taken out and demolded (opening the deflation valve).
 Brief Description
Inflatable rubber mandrel is a kind of cylinder bag that can expand, shrink, used to form concrete component of cavity.  it is usually used in reinforced concrete members, bridge construction, irrigation works and tunnels,such as stake, roof, roof board column, beam, building, water conservancy project(shipyards, slipway, dock).
Specification of Rubber core moldÂ
1> Diameter (D)Â Â Â : From 0.3m to 2.2 m.
2>Total Length (TL) :Â From 7m to28m.
common size |
Special size |
|
¢180mm X 6-20m |
¢400mm X 10-40m |
350 X 530(540)mm X 10-40m |
¢200(¢220)mm X 10-20m |
¢500mm X 10-40m |
320Â XÂ 520(540)Â XÂ 10-40m |
¢240(¢250)mm X 15-40m |
¢600mm X 10-40m |
350(360) X 560mm X 10-40m |
¢300(¢330)mm X 15-40m |
¢620mm X 10-40m |
360 X 640(650)mm X 10-40m |
¢350(¢360)mm X 10-40m |
¢700mm X 10-40m |
320 X 520(550)mm X 10-40m |
Other specification also available upon customer's request. | ||
Shapes
Round, rectangular, octagonal etc.
Schematic cross section for pneumatic rubber core mode:
Technical parameters Rubber core moldÂ
| Dia(mm) | Pressure (MPa) |
| 80 | 0.12 |
| 120 | 0.10 |
| 150 | 0.08 |
| 200 | 0.07 |
| 250 | 0.05 |
| 400 | 0.04 |
| 500 | 0.035 |
| 600 | 0.03 |
| 700 | 0.027 |
| 800 | 0.026 |
| 900 | 0.025 |
| 2200 | 0.005 |
Performance characteristics:
1. Rubber inflatable mandrel has scientific design, the operation is simple, labor-saving, time-saving and    material-saving.
2. It has good aging resistance, long service life, which is made of synthetic rubber, natural rubber and reinforced layer and has good anti-expansion strength, elasticity and flexibility, so it can be used under various working conditions.
3. The applicable temperature is widely in the range of -10 ° C ~ +90 ° C, the material has not changed.
4. It provides favorable conditions for the lightweight construction of the construction site to stress the hollow concrete members.Â
5. construction process is simple, safe, sanitary use of rubber mandrel, only a small number of simple tools, no special process.
As long as the core is molded into the negative reinforcement cage and the inflation pressure reaches the working pressure, the concrete is poured. When the concrete is initially set, the core mold is vented and extracted, and the finished component can be formed without polluting the environment.
Construction method
Â
1. Place the mandrel into the steel cage with the longitudinal joint facing up, inflate to the specified pressure, and close the valve. When lifting the concrete, the upper, lower, left and right sides must be fixed according to the construction process, and the template is used to pressurize the screw to overcome the floating.
Â
2, pouring concrete using high-frequency plug-in vibrator, vibrating from both sides at the same time, to prevent the mandrel from shifting left and right, the end of the vibrator can not touch the mandrel, so as not to break through the air.
Â
3. After the concrete is initially set, the core mold can be taken out and demolded (opening the deflation valve).
Â
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Yuyao Zelin Sanitary Ware Co., Ltd , https://www.zelinshower.com