E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
248/17, 61/2.4
E02D 29/12 (2006.01) B28B 23/00 (2006.01) E03F 5/02 (2006.01)
Patent
CA 1195514
ABSTRACT OF THE DISCLOSURE Means and method for assuring tightly sealing a manhole/sewer pipe connection are provided herein. The heart of the invention resides in a molded elastomeric circular gasket for resiliently supporting a sewer pipe in a manhole opening and sealing the space between the wall of the opening and the surface of the pipe. The transverse cross-section of the gasket has a generally triangular head, with a forward face pro- vided with an arcuate depressing therein, and a sloping rear face; a generally rectangular body, integral with the generally triangular head and generally "L" shaped leg depending from the body and coextensive with the rear face of the body, the leg of the "L" being directed towards the forward face. The method of installation of the gasket into the peri- pheral surface of an opening through the body of a manholw wall comprises the first step of installing at a predetermined movable location, between the inner and outer shells of a form for casting the concrete wall of a manhole, a special two-part mold. The two-part mold consists of an inner mold member of dished shaped having radially outwardly extending flanges thereon of greater diameter than the opening, and an outer mold member of complementary dished shaped having side flanges thereon of the same dia- meter as the opening. The mold is configured to hold a portion only of the elastomeric gasket strip, leaving a portion of the gasket strip pro- jecting outwardly from the mold. The second step involves positioning the mold between the shells by means of a depending bar held to the outer shell and temporarily but firmly secured to the outer shell. The next step involves pouring settable material into one space between the inner and outer shells so as to surround and enclose the mold, and so as to (abstract continued) surround and enclose those portions of the gasket strip which are not received within the mold. The settable material is then permitted to set, and the inner and outer forms are removed, the two part mold separated and removed. This leaves that portion of the gasket strip which had been embedded in the mold projecting into the opening in the body of the manhole wall.
439145
Daigle Clement
Gonthier Emile
Borden Ladner Gervais Llp
Industries Fortier Ltee. (les)
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