Abandoned Pipe Grouting

Abandoned Pipe Grouting

In certain cases law now requires that any abandoned pipe be removed or sufficiently grouted so that it will not collapse in the future and create voids that could cause settlement to the top soil or road bed.

In most cases, cement grout is used as most pipes are open-ended or have a vent in order to void the air pressure as the grout is injected. However, there is the possibility that a run is capped on one end, therefore eliminating the introduction of cement grout material. Two options exist for completing this task. The first being to drill down to the pipe to create a pressure vent.

The second option is to grout the run with Chemical Grout. Chemical Grout is dispensed using a long tube and injection begins after the tube is inserted into the full length of the pipe run. Once the product begins to flow, it flows toward the entrance port (now the grout’s exit) as a liquid and expands up to 20 times its volume as a closed-cell, structural foam. Pressure is voided through the entry point as the chemical reaction takes place and the expansion occurs. Once the Chemical Grout expands and sets, the tubing is cut below grade and buried.

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