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US 8,075,224 B2Granted
Method and device for reconstructing old underground pipes
AssigneeTRACTO-TECHNIK GmbH & Co. KG
InventorsElmar Koch, Martin Köper
Life of this patent
Estimating the term…
Abstract
A method for in-situ repair of old underground pipes is disclosed. A breaking tool with a drive or a pipe section is pulled from a typical inspection shaft to the next inspection shaft (machine shaft) by a hydraulic piston-cylinder unit which has a housing that is at least partially located inside the old pipe. The extremely limited interior space of the machine shaft is thereby kept essentially free from machine parts.
Claims13
A method for reconstructing an old underground pipe, comprising the steps of:
- placing a rod drive at least partially inside the old pipe;
- and
- pulling a tool or a pipe section connected to the rod drive via a rod assembly from a start shaft to a destination or machine shaft,
- wherein the rod drive is arranged inside a pipe liner which protrudes into the old pipe.
1 more element
A device for reconstructing an old underground pipe, comprising:
- a linear push-pull rod drive having one or more hydraulic cylinders, each of said hydraulic cylinders having
- a stationary section comprising a cylinder having a proximal section located near an interior wall of a destination or machine shaft and a distal section extending into the old underground pipe;
- and
- a piston movable in the stationary section and extending into the destination or machine shaft, said piston forming a movable section of the push-pull rod drive;
- coupling means connected to the movable section of the push-pull rod drive and constructed for engagement with a rod assembly;
- and
- a thrust bearing shield placed against an interior wall of the destination or machine shaft, said thrust bearing shield being connected to the proximal section of the push-pull rod drive to prevent movement of the stationary section of the rod drive when the rod drive applies a pulling force to the rod assembly in order to pull a tool or pipe section from a start shaft to the destination or machine shaft.
4 more elements
Dependencies are inferred from the claim text.