(1)The buoyancy material laid on the outer surface of the shell should be closely fitted with the outer surface of the shell.When the buoyancy material is installed,it should be corrected or removed to make the above equipment base installed in the specified position.When correcting or removing the buoyancy material,attention should be paid to the coincidence between the buoyancy material and the buoyancy material and the equipment to prevent gaps.
(2)Buoyant materials should be installed with adhesive bonding,after the installation of the outer surface uneven ground,and external spray or stick waterproof layer to protect the buoyant materials.
(3)The gaps between buoyancy materials should be filled with sawn-off powder and broken particles of buoyancy materials and adjusted adhesive.
(4)Before laying buoyancy materials outside the internal steel structure,rust should be removed,welding slag should be removed,rust prevention primer should be applied,and the surface should be scrubbed clean.According to the laying process,appropriate anchorage points can be set on the shell to increase the firm connection between buoyancy material and the shell.And the relative deformation of the internal frame etc.at the location of the installation of buoyancy materials should be considered to ensure that the installation of the buoyancy block as far as possible to reduce the pulling force.
(5)The quantity of buoyancy materials installed should be preliminarily estimated,and the specific quantity can be adjusted on site according to the actual situation.According to the measured data,appropriate buoyancy materials can be added in other parts to adjust the center of gravity and center of buoyancy.
The buoyancy material and the corresponding waterproof layer after the completion of the external surface should be smooth and neat.
The miniaturization and lightweight of submersible is an important subject to improve its mobility and lifting recovery in seabed survey.Compared with large equipment such as ships,submersible is very sensitive to its own mass.Every kilogram of weight reduction will have a positive impact on saving buoyancy materials and reducing the burden of auxiliary equipment and lifting equipment.It can also increase payloads such as scientific instruments and equipment.While the volume and mass reduction of the internal manned cabin and instruments is very limited,and the mass density of the external non-pressure structure accounts for the mass density of the whole submersible.Therefore,the rationality of the solid buoyancy material design plays a major role in the miniaturization and lightweight of the submersible.
In order to reduce the quality of submersible,the use of fiberglass steel light shell can be reduced.The floating block made of solid buoyant material is directly used to form the streamline shape of submersible.The outer surface is sprayed with elastomer protective layer.This has become one of the key technologies of deep-sea manned submersible.The summary of the design and calculation of solid buoyancy materials in China can provide reference for the relevant scientific and technological workers in China.from Solid Buoyant Materials
