Thrust pipe

Thrust pipe for disposition in a passage in the ground by advance of the pipe axially through the passage comprising:

• a plurality of thrust pipe segments disposed in end to end relation one to the other, each thrust pipe segment including an inner pipe section and an outer pipe section substantially enveloping said inner pipe section;
• each of said inner pipe sections having adjoining ends in abutting relation one with the other;
• each said inner pipe section being formed of a material capable of carrying substantially the entirety of the axial compressive loading on the corresponding pipe segment as the pipe segments are thrust axially along the passage with the outer pipe section thereof carrying substantially none of such loading;
• and
• the opposed ends of adjacent outer pipe sections being spaced one from the other whereby transmission of axial compressive loading from one outer pipe section to the next outer pipe section as the pipe segments are thrust axially into the passage is precluded.

Thrust pipe for disposition in a passage in the ground by advance of the pipe axially through the passage comprising:

• a plurality of thrust pipe segments disposed in end to end relation one to the other, each thrust pipe segment including an inner pipe section and an outer pipe section substantially enveloping said inner pipe section;
• each of said inner pipe sections having adjoining ends in abutting relation one with the other;
• each pipe segment having its outer pipe section terminating at a first end short of the corresponding first end of its inner pipe section;
• each said inner pipe section, at a second end thereof, having a radially enlarged portion for telescopically receiving the first end of the adjacent inner pipe section;
• the outer surface of said pipe segments being of substantially the same diameter throughout their lengths whereby said outer pipe segments present a substantially constant diameter outline to the passage as the pipe is axially advanced within the passage;
• the opposed ends of adjacent outer pipe sections being spaced one from the other whereby transmission of axial compressive loading from one outer pipe section to the next outer pipe section as the pipe segments are thrust axially into the passage is precluded.

A thrust pipe for disposition in a passage in the ground by advance of the pipe axially through the passage comprising:

• a thrust pipe segment including an inner pipe section and an outer pipe section about said inner pipe section;
• said inner pipe section being formed of a material capable of carrying substantially the entirety of the axial compressive loading on the corresponding pipe segment as the pipe segment is thrust axially along the passage;
• said pipe segment having its outer pipe section terminating at one end short of the corresponding end of its inner pipe section;
• the opposite end of said inner pipe section having a radially enlarged portion providing a radially enlarged interior pipe surface;
• the outer surface of said outer pipe section being of substantially constant diameter throughout its length whereby the pipe segment presents a substantially constant diameter outline to the passage as the pipe is axially advanced through the passage.