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construction of dooms

construction of dooms

construction of dooms

(OP)
I plan to construct a doom (shell with thickness 10 cm). I ask about using balloon as internal form for the doom. what are the advantages and disadvantages of this way,the companies which made these ballons, and if this way can give me a internal fair face and any informations can help me.
note: please give me any best ways to conduct a suitable form( the radius of doom may reach 7 m).
thank u.

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