To removably mount a form for opening simply on a film without direct attachment to the film even in case the opening is formed in a place on the film apart from the ground.
A closed space 18 is formed inside a film 16, and compressed air is supplied to the space 18 so that the film is inflated, and to its outside, concrete is sprayed so that a ceiling wall 8 is constructed. A form 20 for opening is placed before the concrete is sprayed, and the spray of concrete is applied to the area elsewhere than the area where the form 20 is placed, and the first layer of concrete 22 is formed, whereon reinforcing bars 24 are laid. The form 20 is coupled with the part with these bars 24 by bundling wires 28 and secured onto the film 16. Then concrete is sprayed to form ceiling wall 8, and after hardening, the wires 28 are cut, and the form 20 is removed from the ceiling wall 8, and thus the intended opening 14 is formed.
OKANO MIKIO
SHIGEOKA YOSHINORI
HP DOME JAPAN KK
JP36013557A | ||||
JPS384404Y1 |