| 摘要 |
Disclosed is a structure for repairing conduit, such as drain tile, found in the construction of underground utilities, which conduit severed by the digging of a ditch. A spray-in-place or pre-manufactured a foamed polymer bridge is placed transverse to the longitudinal direction of the underground utility conduit and atop the underground utility conduit. The foamed polymer bridge has a cavity at its top and is semi-circular at its bottom for fitting over the underground utility conduit. Weight is placed in the polymeric foam cavity for countering water buoyancy forces on the polymer foam in the ditch when the ditch is back-filled with dirt. A support is optionally placed atop the foamed polymer bridge and transverse to the longitudinal direction of the underground utility conduit for supporting the repaired pipe spanning the ditch. Additionally, such pre-manufactured foam bridges can be used as breakers to support underground utilities, such as large pipe. |
