Qingdao Henger Shipping Supply Co., Ltd
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The use of airbags to launch ships is an innovative technology with my country's independent intellectual property rights, and it is a new technology with great development prospects. The characteristics of less investment, quick effect, safety and reliability have been welcomed by the shipbuilding industry.
The new technology of airbag launching has its unique advantages. Practice has proved that with the application of high-strength lifting and load dynamic airbags, the advent of new airbags, and the successful design of slipway and launching ramps, it is completely possible to launch airbags for ships above 50,000 tons. It is feasible, but relevant safety measures must be taken: the slipway and the angled launching ramp for the launch of the ship's airbag should be carefully designed; the launch of the airbag should be carried out according to the weight of the ship, the position of the center of gravity, the shape of the bottom of the ship, the slope of the launching ramp, the water level, etc. Calculation: There should be a calculation basis for the internal pressure and internal stress of each airbag during each rolling stroke, especially when the ship is stern-falling and stern-floating.
The production and application of marine airbags are mainly carried out with reference to two industry standards: CB/T3795 "Airbags for upper discharge and launching of ships" and CB/T3837 "Technical requirements for upper discharge and launching of marine airbags".
Airbag Advantages
Use a lot of uninflated cylindrical bladders to go down to the bottom of the boat, then inflate to lift the boat up, remove other obstacles below, and then slowly release a few airbags at the back, and put the hull back a little bit. It looks like, and then use the power to push it a little in front, and the boat will naturally go to the back of the water, so that the boat will be launched.
In the shipbuilding industry, the launching of ships is a relatively complex process. Inland and coastal shipping ships are generally launched by rail sliding and airbag rolling. The rail sliding method requires a slipway or a dock. Due to factors such as high investment cost and small application scope, it is generally only Used by large shipyards. Marine airbags are widely used by small and medium-sized shipyards due to their small overall investment and wide application range.
Status of launching
The initial development of marine airbag launching is that the establishment of the theoretical system is far behind the development of practice, so there are some disputes about the safety of airbag launching.
In the course of more than 20 years of practice in the use of air bag launching and launching technology for ships, the launching of ships has ranged from a flat-bottomed ship with a dead weight of dozens of tons to a large ship with a weight of tens of thousands of tons, which proves that the ship's air bag launching and launching process is safe and reliable. This technology has been recognized by foreign shipbuilding and port construction industries, and airbag launching has been promoted to a certain extent in the United States, Europe, South Korea, Japan and Southeast Asia and other regions and countries.
In the 21st century, as a mature technology, airbags have been widely used in the upper and lower discharge of ships and other heavy object transportation fields.
China's airbag launching technology has been widely promoted in the world. At present, airbags have been widely used in the fields of caisson jacking, transfer, wreck salvage, and underwater installation engineering in port construction.
Airbag storage
When the airbag is not used for a long time, it should be washed and dried, filled with talcum powder inside and outside, and placed in a dry, cool and ventilated place indoors. The airbag should be stretched out and laid flat, and should not be stacked, and heavy objects should not be stacked on the airbag. The place where the air bag is stored should be kept away from heat sources. Airbags cannot come into contact with acids, alkalis, greases and organic solvents.
1. Size deviation
The deviation between diameter and effective length is -2%---+2%,
The deviation of the total length is -4%---+4%,
2. The amount of elastic deformation
When using 1.2 times the working pressure as the experimental pressure, the diameter deformation is not more than 5%
3. Safety factor
The safety factor is not less than 4.5
4. Air tightness
Inflate for 1h, the pressure drop is not more than 5%
5. Appearance requirements
The line is smooth, without cracks and bubbles, heavy skin, mixed impurities and obvious dirt and other defects.
6. Safety inflatable device
A safety valve should be installed on the bag nozzle, and the starting pressure of the safety valve should be 1.25 times the working pressure.
SPECIFICATION OF OUR SHIP LAUNCHING AIRBAG
| Some normal sizes of our ship launching airbags, other sizes are also available | |||
| Diameter(m) | Effective Length(m) | Layer | Pressure(MPa) |
| 1.0 | 10 | 5~6 | 0.07~0.10 |
| 1.0 | 12 | 5~6 | 0.07~0.10 |
| 1.0 | 15 | 5~6 | 0.07~0.10 |
| 1.2 | 10 | 5~6 | 0.08~0.12 |
| 1.2 | 12 | 5~6 | 0.08~0.12 |
| 1.2 | 15 | 5~6 | 0.08~0.12 |
| 1.5 | 12 | 5~8 | 0.08~0.16 |
| 1.5 | 15 | 5~8 | 0.08~0.16 |
| 1.5 | 18 | 5~8 | 0.08~0.16 |
| 1.5 | 20 | 4~8 | 0.08~0.16 |
| 1.5 | 24 | 5~8 | 0.08~0.16 |
| 1.8 | 12 | 5~8 | 0.08~0.15 |
| 1.8 | 15 | 5~8 | 0.08~0.15 |
| 1.8 | 18 | 5~8 | 0.08~0.15 |
| 1.8 | 20 | 5~8 | 0.08~0.15 |
| 1.8 | 24 | 5~8 | 0.08~0.15 |
| 2.0 | 18 | 6~10 | 0.08~0.18 |
| 2.0 | 20 | 6~10 | 0.08~0.18 |
| 2.0 | 24 | 6~10 | 0.08~0.18 |
| 2.5 | 18 | 7~10 | 0.07~0.13 |
| 2.5 | 20 | 7~10 | 0.07~0.13 |
| 2.5 | 24 | 7~10 | 0.07~0.13 |