| 摘要 |
A method of constructing a fire-stop collar assembly involves the steps of choosing a dummy pipe (14) at a factory which is an approximate size and shape of a pipe at an installment site on which a fire-stop collar assembly (10,54) produced by this method is to be mounted and, at the factory, wrapping an intumescent collar (34,82) into an approximate ring about an outer surface of the dummy pipe. Also, at the factor, a metallic band (32) is wrapped about the intumescent collar while the collar is wrapped about the dummy pipe and the end portions (36,38) are held together by a fastening device (40,56) while the collar is wrapped about the dummy pipe. Still at the factory, the dummy pipe is removed from the intumescent collar and the metallic band by longitudinal movement along the dummy pipe, thereby leaving rings of intumescent collar and the metallic band held together as an integral fire-stop collar assembly. Thereafter, the thusly assembled fire-stop collar assembly is transported away from the factory to be delivered to a separate installment site for permanent engagement on the pipe at the installment site. In one embodiment, the intumescent collar (82) is glued to the metallic band, and two longitudinal cuts (60,64 and 62,66) are placed along the intumescent collar, the longitudinal cuts being spaced approximately 180 DEG from one another. The metallic band is compressed by a strap clamp (56) which can be removed and the fire-stop collar assembly can be easily opened to be placed on the pipe.
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