System and method for laying underground cables or underground lines in the ground near the surface

Patent metadata

Field	Value
Publication number	US-10734793-B2
Application number	US-201615574460-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

The invention relates to a system for laying underground cables or underground lines in the ground near the surface, in a borehole ( 102 ) along a laying route ( 101 ) between a start point ( 100 ) and a target point ( 110 ), comprising a boring device ( 10 ) comprising an advancing head ( 12 ) for creating the borehole ( 102 ), a drilling rod ( 11 ) and/or a casing ( 14 ), wherein the diameter of the advancing head ( 12 ) is greater than the diameter of the casing ( 14 ) or of the drilling rod ( 11 ), so that an annular space ( 121 ) is formed between the borehole wall ( 102 ) and the casing ( 14 ) or the drilling rod ( 11 ) and the annular space ( 121 ) is provided with lubrication and wherein the advancing head ( 12 ) relates to a displacement drilling head ( 15, 16, 41 ) or a drilling head system ( 18 ) comprising a drilling tool ( 19 ) and a drilling tool drive ( 22 ) for loosening the ground.

First claim

The invention claimed is:

1. A system for laying underground cables or underground lines in the ground near the surface, the cables or lines being laid in a borehole along a laying route between a starting point and a target point with a drilling apparatus, comprising;
a drilling head comprising a drilling tool with a drilling tool drive, configured to loosen soil to create the borehole; and,
at least one of drill piping or casing connected to the drilling head;
a mud circuit connected to the drilling head with a jet pump, configured to convey away from the borehole the soil loosened by the drilling head inside at least one of the drill piping or the casing, wherein the jet pump is arranged in the drilling head;
wherein a diameter of the drilling head is greater than a diameter of at least one of the piping or casing whereby an annular space is created between a borehole wall and the at least one of piping or casing, and the annular space is filled with a lubrication, and
wherein the at least one of the drill piping or casing is removed from the borehole and at least one of the underground cables, the underground lines or a protective pipe containing the underground lines or cables is placed within the borehole while or before the drill piping or casing are removed.

2. The system as claimed in claim 1 , wherein the drilling-tool drive is at least one of an electric motor or a mud motor or a piping drive.

3. The system as claimed in claim 1 comprising the mud circuit, configured to at least one of drive or steer the advancement head.

4. The system as claimed in claim 1 wherein the drill piping is at least one of double-walled design which is a constituent part of the mud circuit, or arranged with an interior of the drill piping and the annular space between the casing and drill piping as constituent parts of the mud circuit.

5. The system as claimed in claim 1 comprising at least one discharging point configured to discharge drilling lubrication fluid.

6. The system as claimed in claim 1 comprising a second drilling run comprising a reamer-drilling head connected to the at least one of drill piping or casing, wherein the reamer-drilling head is at least one of; a hammer drill configured to displace the soil, a soil-displacement screw with a drilling-tool drive configured to displace the soil, or a drilling-head system comprising a drilling tool and drilling-tool drive configured to loosen the soil.

7. The system as claimed in claim 1 , wherein the protective pipe is produced on site out of at least one of a hose made of plastics material, or pipe sections made of plastics material.

8. A method for laying underground cables or underground lines in the ground near the surface, the cables or lines being laid in a borehole along a laying route between a starting point and a target point, comprising:
moving a drilling head along the laying route
transmitting at least one of a feed motion or a feed motion and a rotation via at least one of drill piping or casing;
loosening and removing soil by the drilling head resulting in an annular space between a borehole wall and at least one of the casing or the drill piping, or a protective pipe; and,
introducing a lubrication in the annular space wherein the at least one of the drill piping or casing is removed from the borehole and at least one of the underground cables, the underground lines or a protective pipe containing the underground lines or cables is placed within the borehole, while or before the drill piping or casing are removed;
wherein as the drilling head is used a drilling-head system comprising a drilling tool and drilling-tool drive, wherein the soil loosened by the drilling head to conveyed away from the borehole inside at least one of the drill piping or the casing using a jet pump as part of the drilling head system.

9. The method as claimed in claim 8 , wherein a mud circuit for a bentonite mud medium at least one of drives or steers the drilling head or conveys away the loosened soil from the borehole, wherein operations of feeding and discharging the mud medium in the mud circuit are at least one of via double-walled drill piping or via the an interior of the drill piping, or via the annular space between the casing and drill piping.

10. The method as claimed in claim 8 , wherein operations of feeding and discharging a mud medium in a mud circuit are at least one of via double-walled drill piping or via an interior of the drill piping, or via the casing.

Assignees

• Herrenknecht Ag

Inventors

• Peters Marc
• Engel Tobias
• Gerhardt Tobias
• Praetorius Steffen

Classifications

• E21B7/20

  Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes · CPC title

• E21B7/046

  horizontal drilling (drilling with mechanical conveying means E21B7/003) · CPC title

• E21B7/04 Primary

  Directional drilling · CPC title

• E21B7/128

  from floating support with independent underwater anchored guide base · CPC title

• H02G1/06

  for laying cables, e.g. laying apparatus on vehicle · CPC title