Underground duct banks
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 25, 1997
Grant Date -
N/A
app pub date -
Jun 14, 1994
filing date -
Jun 14, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Flexible, elongated, tubular ducts or conduits are assembled above ground on transverse supports into a duct bank of an array of layers held by a plastic grid of transverse spacers. An underground trench can be excavated having substantially straight sidewalls, while excavated soil from the trench is placed on the side away from the assembled duct bank. Two or more pieces of equipment, spaced apart, sequentially lift and laterally move the assembled duct bank to the trench. Transverse support members spanning the trench are removed, and the assembled duct bank is lifted and lowered sequentially into the trench using a small angle of displacement from the horizontal while lowering the assembled duct bank onto transverse support members positioned in the bottom of the trench, to provide an underground duct bank. Round, freely rotatable, plastic spacers in groups of four facilitate lowering the assembled duct bank into the trench. In one aspect, the ducts or conduits are connected to a concrete manhole at a sidewall through a bell-end, adjustable in length, having threads in the outer surface of the bell-end for receiving an adapter threaded on one end and adapted to receive the duct or conduit into the adapter's other end.
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