Apparatus for bursting an existing pipe and widening the bore th

Details Apparatus for bursting an existing pipe and widening the bore th Apparatus for bursting an existing pipe and widening the bore th

1990-03-29

1991-12-31

Taylor, Dennis L.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

138 97, 166 55, 405184, F16L 100, F16L 5418

Patent

active

050767313

ABSTRACT:
The apparatus comprises a mole to be pulled through an existing pipe provided with a cone-shaped head portion for widening an existing pipe, a cutting arrangement with radially protruding blades in front of the effective head portion and a guidance portion having a cylindrical portion centered on the mole axis which precedes the cutting arrangement, the diameter of the cylindrical part being slightly smaller than the bore diameter of the existing pipe. For cutting along two lines parallel to the line of apparatus advance and for centering the apparatus in the existing pipe in the case of any usual utility line, a cable passes axially through the cylindrical portion of the apparatus and is fastened to the head portion of the mole. The guidance portion is loosely attached to the cone-shaped head portion and is axially moved through the existing pipe by the head portion and the cable.

REFERENCES:
patent: 3181302 (1965-05-01), Lindsay
patent: 4634313 (1987-01-01), Robbins
patent: 4648746 (1987-03-01), Abinett
patent: 4674914 (1987-06-01), Wayman et al.
patent: 4720211 (1988-01-01), Streatfield et al.
patent: 4738565 (1988-04-01), Streatfield et al.
patent: 4789268 (1988-12-01), Yarnell
patent: 4981181 (1991-01-01), Hesse
patent: 4983071 (1991-01-01), Fisk et al.

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