| 摘要 |
The invention relates to a prefabricated opening frame, and to a process and an installation for its manufacture. The frame 10 comprises a thin-walled moulded part, formed from a material of the reinforced concrete type, whose different parts 12, 14, ... have a cross section in the general form of a Z whose inner 12.1, 14.1, ... and outer 12.2, 14.2, ... wings respectively correspond to the inner and outer face of the wall 20 in which the opening is made and are connected to each other by a web 12.3, 14.3, ... Application to making new buildings or to renovating old buildings. <IMAGE>
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