| 摘要 |
An external manhole sealing assembly for sealing the joint to a manhole frame and a manhole casing which includes a resilient sleeve mounted on the manhole frame and the manhole casing to span the joint between the frame and casing, the sleeve is secured to a flexible ring which is mounted on the flange of the manhole frame and a second band encircling the sleeve on the manhole casing, the manhole frame being raised above the manhole casing a predetermined distance prior to sealing the sleeve to the manhole casing so that a bulge is created in the sleeve when the manhole frame is seated on the manhole casing, the bulge allowing for heaving of the manhole frame without destroying the joint seal.
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