Method and apparatus for treating underground pipeline

1. A system for internally filling a joint or other discontinuity in a pipeline comprising:

a flexible conduit;

a fill device removably connected to said flexible conduit, wherein the fill device is constructed and arranged to apply a fill material to an interior surface of said pipeline to fill one or more gaps in the pipeline;

a propulsion unit connected to at least one of the flexible conduit and the fill device that propels the flexible conduit through said pipeline; and

a milling device that is constructed and arranged to couple to the flexible conduit and to mill an area of a pipeline prior to application of fill material from the fill device.

2. The system of claim 1 , wherein the fill device includes a center carriage and at least one scraper coupled to the center carriage and constructed and arranged to contact an inner surface of the pipeline to move debris on the inner surface.

3. The system of claim 2 , wherein the at least one scraper is moveably mounted to the center carriage and constructed and arranged to be moveable between a retracted position and an activated position.

4. The system of claim 3 , wherein the at least one scraper is a plurality of scrapers.

5. The system of claim 4 , further comprising an entry unit, coupled to the flexible conduit and coupled to the propulsion unit, that is constructed and arranged to mate with a live pipeline.

6. The system of claim 5 , wherein the fill device is constructed and arranged to spray foam for filling gaps in a pipeline, and to spray a sealant to seal a gap in a pipeline.

7. The system of claim 6 , wherein the fill device is constructed and arranged to spray fill material in the presence of pressurized gas in the pipeline.

8. The system of claim 1 , wherein said fill device comprises:

a carriage having a first end and a second end;

a spraying mechanism detachably connected to the first end of the carriage; and

a plurality of adjustable legs, each having a first end and a second end, the first end connected to said carriage, and the second end constructed and arranged to contact an inner surface of the pipeline.

9. The system of claim 8 , wherein the fill device further includes:

rolling members rotatably connected to the second end of the adjustable legs; and

a monitoring device detachably connected to the carriage.

10. The system as claimed in claim 9 wherein the monitoring device is a sealed explosion-proof camera probe.

11. The system of claim 1 , further comprising an entry unit, coupled to the flexible conduit and coupled to the propulsion unit, that is constructed and arranged to mate with a live pipeline.

12. The system of claim 1 , wherein the fill device is constructed and arranged to spray foam for filling gaps in a pipeline, and to spray a sealant to seal a gap in a pipeline.

13. The system of claim 1 , wherein the fill device is constructed and arranged to spray fill material in the presence of pressurized gas in the pipeline.

14. The system of claim 1 , wherein the milling device includes a stop constructed and arranged to contact an inner surface of the pipeline to control a depth of milling in the pipeline by the milling device.

15. The system of claim 1 , further comprising:

a first carriage coupled to the flexible conduit, wherein the fill device is coupled to the first carriage; and

a second carriage coupled to the first carriage, wherein the milling device is coupled to the second carriage.

16. The system of claim 15 , further comprising a tractor device coupled to the flexible conduit, to the first carriage and to the second carriage to propel the first carriage and the second carriage in the pipeline.