DE102011110622A1 - Method for laying two pipes, particularly energy supply pipeline, such as gas pipeline and water supply pipeline, in ground, involves forming large bore channel in bore head by large cutting wheel driven by main drive for large pipeline - Google Patents

Abstract

The method involves forming a large bore channel (4) in a bore head (9) by a large cutting wheel (7) driven by a main drive (14) for a large pipeline (2) and forming a small bore hole (3) parallel to an axis of an exterior of the large bore channel by a small cutter wheel (6) driven by an auxiliary drive for a small pipeline (1). The large pipeline is moved in the large bore channel, and the small pipeline is pulled in the small bore hole. An independent claim is included for a device for laying two pipes, particularly energy supply pipeline, such as oil or gas pipeline and water supply pipeline, in ground.

Description

The present invention relates to a method and thereby usable devices for laying two pipes in the ground.

State of the art

When laying pipelines for energy and water supply (pipelines), in addition to the actual product pipelines for oil, gas or water transport, cables are also almost always laid for the control and monitoring of the pipeline. This co-laying is very easy when the pipeline is laid in the open trench, because then the cable can be laid with practically no significant additional effort in the same trench with.

In trench sections, where an open trench is not possible for ecological reasons (nature conservation) or economic reasons (traffic flow), today so-called trenchless laying techniques are used. These techniques include, for. As the controlled horizontal drilling technique (HDD = Horizontal Directional Drilling), the controlled pipe jacking (Microtunneling) or in the patent application DE 10 2006 020 339.9 revealed, now called "Direct Pipe ^® " laying method used.

While in the HDD process it is possible to lay a conduit for the cables in the same borehole as the product pipe (as in this method the borehole diameter is chosen to be much larger than the diameter of the product pipe), the pipe can be controlled together with the product pipe in controlled pipe jacking in the process required (concrete) protective tube to be laid with. Only for the Direct Pipe ^® method there are z. Z. still no way to lay simultaneously with the product tube and a cable conduit. In principle, a cable protection tube has to be routed by means of a completely independent, additional drilling (mostly by HDD method). This means considerable technical and financial overhead.

Technical task

The present invention is therefore based on the object to provide a method and usable devices, with the help of the simultaneous installation of a product and a cable conduit in the Direct Pipe ^® method is made possible.

Solution of the technical task

The technical problem is solved by externally attached to a (Direct Pipe ^®) -Bohrkopf by a web an auxiliary drive with its own cutter, which creates a second smaller bore channel for the small conduit outside the large bore channel for the large product pipe, in the the cable protection tube attached to the rear end of the small bore motor is retracted.

The drilling and laying process for the large pipeline corresponds exactly to that of the known Direct ^Pipe® process, ie the feed force required for the drilling process is generated outside the borehole and transmitted to the boring head via the large pipeline. The necessary control operations of the drill head, which are necessary to lay the drill head and thus the large pipeline exactly along a straight or curved target line in the ground, correspond to those of the Direct Pipe ^® method.

The required for the simultaneous installation of the small pipeline small bore channel is created by a power take-off with a small cutting wheel, which are mounted practically "piggyback" firmly by means of a ridge on the drill head. Due to the fixed connection via the web, a second, smaller drilling channel can be created axis-parallel to the large drill channel. The feed forces required for this drilling process are also transferred from over-ground via the large pipeline to the drill head and from there via the web to the auxiliary drive.

In a preferred application, the auxiliary drive consists of a drilling fluid motor and a small cutting wheel mounted thereon. This small cutting wheel is attached to the front end of the drilling fluid motor while the small pipe is attached to the rear end of the drilling fluid motor. The Bohrflülungsmotor itself is laterally connected via the bridge with the drill head.

The energy required to drive the drilling fluid motor is taken from a drilling fluid pumped through the small pipeline. It flows through the drilling fluid motor, discharges a large part of its dynamic energy and then enters the small drill channel on the small cutting wheel. There she picks up the soil detached from the small cutting wheel. Such Bohrflülungsmotoren are known from the deep drilling and horizontal drilling and are sometimes referred to as "Mud Motor".

Alternatively, the drive of the small cutting wheel in place of the Bohrspülungsmotors also by a mounted in a bearing tube, a separate hydraulic motor or attached to this bearing tube mechanical gear (gears or sprockets) done in which a large sprocket (= drive) are mounted on the large cutting wheel and a small sprocket on the small cutting wheel.

In the embodiment variants by means of a hydraulic motor or mechanical gear, the drilling fluid required for the drilling process on the small cutting wheel can also take place via the feed line of the large drill head, since in these cases substantially lower flushing pressures are required than when using a Bohrflülungsmotors.

Differentiation from existing procedures

With the method according to the invention and the devices which can be used in this case, the simultaneous laying of a large (product) tube and a small (cable protection) tube becomes possible. At the moment, this can not be done by the well-known Direct Pipe ^® process.

Advantages of the invention

The basic advantages of the invention are to minimize the technical and financial overhead of laying a small pipe (eg, cable conduit) in the course of laying a large pipe (product pipe) by the Direct ^Pipe® process.

drawings

The method according to the invention and devices which can be used in the process are illustrated with reference to drawings and explained below, wherein the features shown there have exemplary character. The drawings show:

1 : Exemplary representation of the devices according to the invention in a drive of the small cutting wheel by means of a drilling fluid motor.

2 : Exemplary representation of the devices according to the invention in a drive of the small cutting wheel by means of a hydraulic motor.

3 : Exemplary representation of the devices according to the invention in a drive of the small cutting wheel via a mechanical transmission.

4 : Exemplary representation of the devices according to the invention when supplying the drilling fluid for the small cutting wheel through the interior of the large pipeline.

LIST OF REFERENCE NUMBERS

1

Small pipeline

2

Great pipeline

3

Small drill channel

4

Large drilling channel

5

Bohrspülungsmotor

6

Small cutting wheel

7

Large cutting wheel

8th

drilling fluid

9

wellhead

10

web

11

hydraulic motor

12

Small sprocket

13

Big sprocket

14

main drive

15

power supply

16

Axis of small pipeline

17

Axle of the big pipeline

18

ground

19

bearing tube

20

separation

21

feeder

22

PTO

embodiments

In 1 are exemplified the essential elements of the method according to the invention with its essential mechanical devices for a preferred application. This is the drill head 9 by means of the big pipeline 2 along the axis of the large pipeline 17 through the ground 18 pushed. The upcoming ground 18 gets it from the big cutting wheel 7 and the big cutter wheel 7 emerging drilling fluid 8th solved and discharged. On the outside of the drill head 9 the big pipeline 2 will be over a jetty 10 a drilling fluid motor 5 appropriate. The drive energy for the drilling fluid motor 5 gets through the small pipeline 1 pumped drilling fluid 8th taken. After the drilling fluid 8th the drilling fluid motor 5 it passes through the small cutting wheel 6 out. There it releases together with the teeth of the small cutting wheel 6 the upcoming ground 18 and transports him to overground. The axis of the small pipeline 16 runs parallel to the axis of the large pipeline 17 , The ones for the drilling process on the large cutting wheel 7 required drilling fluid 8th is via a feed line 21 through the interior of the large pipeline 2 fed. The drive of the large cutting wheel 7 via the (usually hydraulic) main drive 14 who has his energy over the energy supply 15 receives.

In the section AA in 1 is a preferred arrangement of the Bohrspülungsmotors 5 at the 12 o'clock position on the drill head 9 attached jetty 10 shown. Basically, however, is any other Position of the bridge 10 on the outer surface of the drill head 9 possible. Shown are also the small drill channel 3 as well as the large drilling channel 4 ,

In contrast to 1 is in 2 the drive of the small cutting wheel 6 but now by a hydraulic motor 11 performed. This is located in a bearing tube 19 and gets its energy to drive the small cutting wheel 6 from the power supply 15 of the main drive 14 , The supply of energy from the inside of the drill head 9 to the hydraulic motor 11 done by the bridge 10 ,

In contrast to 1 and 2 is in 3 the drive of the small cutting wheel 6 made by a mechanical gear, whose large sprocket 13 with the big cutting wheel 7 and its small sprocket 12 with the small cutting wheel 6 connected is. The consequent higher speed of the small cutting wheel 6 is desired and results in speeds similar to those of a drilling fluid motor 5 or a hydraulic motor 11 can be achieved. The different direction of rotation of the small cutting wheel 6 and the big cutting wheel 7 are inconsequential for the drilling process and only require appropriate mounting or securing of the cutting wheels.

In 4 will the drilling fluid 8th not through the small pipeline 1 to the small cutting wheel 6 guided, but by a feed line 21 that are inside the big pipe 2 and the drill head 9 runs and over the jetty 10 with the bearing tube 19 connected, pumped. The small pipeline 1 is by a separation 20 from the bearing tube 19 separated, so no drilling fluid 8th into the small pipeline 1 can flow. The feed line 21 supplied in a preferred application simultaneously the great cutting wheel 7 with drilling fluid 8th ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006020339 [0003]

Claims (5)

Method of laying two pipes in the ground, characterized in that for a large pipeline ( 2 ) one of a in the drill head ( 9 ) located main drive ( 14 ) driven large cutting wheel ( 7 ) a large drill channel ( 4 ) and for a small pipeline ( 1 ) one of a power take-off ( 22 ) powered small cutting wheel ( 6 ) a small drill channel ( 3 ) parallel to the axis outside the large drilling channel ( 4 ), the large pipeline ( 2 ) into the large drill channel ( 4 ) and the small pipeline ( 1 ) simultaneously into the small drill channel ( 3 ) is drawn in by the small pipeline ( 1 ) fixed to the rear end of the PTO ( 22 ) and the auxiliary drive ( 22 ) laterally over a bridge ( 10 ) fixed to the drill head ( 9 ) and for the drilling of the small bore channel ( 3 ) required drilling fluid ( 8th ) through the small pipeline ( 1 ) and the auxiliary drive ( 22 ) to the small cutting wheel ( 6 ) is pumped. Device according to claim 1, characterized in that the auxiliary drive ( 22 ) for the small cutting wheel ( 6 ) from a drilling fluid motor ( 5 ), which provides the required drive energy through the small pipeline ( 1 ) pumped drilling fluid ( 8th ) receives. Device according to claim 1, characterized in that the auxiliary drive ( 22 ) for the small cutting wheel ( 6 ) from a bearing tube ( 19 ) and a hydraulic motor ( 11 ), the hydraulic motor ( 11 ) the required drive energy from the power supply ( 15 ) of the main drive ( 14 ) of the large cutting wheel ( 7 ) receives. Device according to claim 1, characterized in that the auxiliary drive ( 22 ) for the small cutting wheel ( 6 ) from a bearing tube ( 19 ) and a located at the front end of the bearing tube small sprocket ( 12 ) and the drive of the small sprocket ( 12 ) over a large sprocket ( 13 ), wherein the large sprocket ( 13 ) fixed to the main drive ( 14 ) driven large cutting wheel ( 7 ) connected is. Device according to claim 3 and 4, characterized in that the drilling fluid ( 8th ) over one through the large pipeline ( 2 ) and the drill head ( 9 ) extending feed line ( 21 ) through the bridge ( 10 ) in the bearing tube ( 19 ) is pumped and between bearing tube ( 19 ) and small pipeline ( 1 ) a separation ( 20 ) is installed.

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