发明名称 Boot guard for sewer manhole construction
摘要 A boot guard which is fitted onto the end of a sewer pipe for abutting engagement with the flexible seal between the sewer pipe and manhole side wall opening for protecting the flexibility of the joint seal and permitting easier removal of the sewer pipe for repair or replacement. The boot guard includes a generally half-circle, annular base portion having an undercut rectangular peripheral groove therein. A flexible securing band is fitted into the undercut groove and wrapped around the upper periphery of the sewer pipe for holding the base portion in place prior to concrete being poured into the bottom of the manhole construction. When concrete is poured into the bottom of the manhole construction, the boot guard prevents contact between the concrete and the flexible seal and also prevents contact between the concrete and the end of the sewer conduit.
申请公布号 US4554772(A) 申请公布日期 1985.11.26
申请号 US19840578157 申请日期 1984.02.08
申请人 LABENZ, GARY F. 发明人 LABENZ, GARY F.
分类号 E03F3/04;E03F5/02;(IPC1-7):E04B1/62 主分类号 E03F3/04
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