JPH1018773A - Device for enlarging cross-section of pilot hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the cross-section of a pilot hole with the use of an excavating head or to replace an old pipe with a new one by excavating earth with the excavating head, and by discharging earth in the center part thereof. SOLUTION: A cage-like excavating head 1 is rotatably journalled to an intermediate member 15 serving to connect a discharge pipe 17 with a product pipe 19. A cutter means provided to the head 1 breaks an old pipe and/or peels off earth around a pilot hole. The peeled-off earth is led through an opening 4 in the head 1 under action of cleaning liquid, into the head 1, and is then discharged therefrom through a discharge pipe 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for enlarging the cross section of a pilot hole or updating an old pipe.

[0002]

2. Description of the Prior Art Known devices of this kind are generally provided by a winch wire or by a rotating / pulling rod (gearing, Ge
staenge), using cones (kegels) that are pulled through the pilot hole. In this case, the pilot hole is enlarged by the geschlossen cone pushing the soil laterally.

Furthermore, a magnifying device in which a magnifying head configured as a mining tool is provided on a rod which is formed in the shape of a pipe and is slidably and / or rotationally driven is disclosed in German Patent No.
No. 220430. The magnifying head has a ramp and scrapes the soil surrounding the pilot hole. In order to discharge this soil, the rod is rotatably connected to the adapter member at a distance behind the magnifying head, and the end wall of the adapter member facing the magnifying head introduces the soil peeled by the magnifying head. Opening is provided. The soil that has entered the adapter member through the opening is discharged through a tension-following pipe connected to the adapter member. The pipe also serves as a product pipe.

[0004] In order to facilitate the drainage of soil by the tension following pipe, a cleaning liquid (for example, bentonite suspension) is supplied to the adapter member through a rod formed in a pipe shape. However, the above publication does not show details.

The known apparatus suffers from certain drawbacks due to the spacing of the rotating mining tool in front of the non-rotating adapter member. That is, the exfoliated soil will inevitably accumulate in front of the adapter member and will inevitably be compressed to a certain extent, and thus will only completely or only partially enter the adapter member, and will therefore It is only partially discharged via the pipe. The soil that does not enter the adapter member is discharged outside the adapter member and the connected tension following pipe. Thus, a problem arises. This is because the enlarged head has only a slightly larger diameter than the adapter member and the tension following pipe. Therefore, only a narrow annular path exists between the dilating head and the tension following pipe and the underground hole formed by the dilating head, through which the soil must be discharged. In order to reduce the peripheral friction between the soil and the adapter member and the tension-following pipe, and in particular also to avoid blockages, a relatively large amount of washing liquid must be supplied to the annulus. This flushing liquid volume must be supplied via a pipe-shaped boring rod, causing a random free reflux in the annular space surrounding the adapter member and the tension following pipe, thereby creating a hollow space, The hollow space may subsequently cause land subsidence and consequent damage to roads and buildings.

In the case of loose ground, the injection of a stabilizing bentonite suspension or a polymer solution,
No annular path is formed, or at least a stable annular path is not formed. Furthermore, even in the case of porous ground, most of the washing liquid leaks and disappears, contaminating the soil. Further, at the time of soil discharge, there is little possibility of collecting the washing liquid to recover an essential part for reuse.

[0007] The amount of cleaning liquid supplied via the rod must be sufficient to achieve a flow rate sufficient to prevent blockage during transport in the annulus for discharging boring strips with the cleaning liquid. Often sufficient. At present, boring facilities with increasingly high performance have resulted in lengths of 500
As many as m pilot holes can be made. Problems arise with the transport of soil over such long distances. That is,
There is a practical limit as to the length of the new conduit to be drawn.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to create an expanding device capable of discharging as much as possible the soil discharged when the cross section is expanded or the old pipe is renewed, in order to avoid the above-mentioned drawbacks. It is in.

[0009]

The solution to the above problem relies on the idea of mining the soil with a drilling head (Raeumkopf) and discharging it in a controlled and central way.

According to the present invention, there is provided an apparatus for enlarging the cross section of a pilot hole or renewing an old pipe, comprising: a rotatable excavating head; an opening communicating with the inside of the excavating head; This is done by a subsequent tension following pipe and a tension rod connected to the drilling head and the rotary drive.

The cross section of the drilling head opening must be smaller than the cross section of the discharge pipe. This is necessary so that stones entering through the openings can move in the discharge pipe. This is especially important on gravel or loose ground where conventional methods of material dischargers do not work outside the pipe.

In this case, the drilling head is rotatably mounted on an intermediate member, said intermediate member having a connection for a discharge pipe and possibly a connection for a product pipe and a washing liquid conduit. ing. The drilling head can be configured as a cutter means, or the removal head can be provided with cutter means (e.g., a cutting edge) to facilitate mining of soil surrounding the pilot hole and to form a relatively fluid soil. . Also, the drilling head can be configured in an egg shape,
And / or it may be provided with a guide member leading in the pilot hole or the old pipe.

If the drilling head is provided with an inward and / or outwardly directed nozzle to supply the cleaning liquid via a pipe-shaped tension / rotation rod and a flow path provided in the drilling head. , Soil discharge is further improved. Outward nozzles can be arranged radially, or
The outflowing washing liquid can be arranged to serve as a supportive jet propulsion of the drilling head based on the reaction force and / or to facilitate mining and draining of the soil.

[0014] To stabilize the soil surrounding the tension-following pipe, while at the same time reducing the peripheral friction, the drilling head can have a nozzle oriented parallel to the rear or in the direction of the tension-following pipe. The nozzle supplies a cleaning liquid to a narrow annular space formed based on the fact that the drilling head has an outer diameter somewhat larger than the tension following pipe.

As the washing liquid, a bentonite suspension having a lubricating action and also having an action of supporting the soil surrounding the underground hole is suitable. Instead of a washing solution,
The annular space between the tension-following pipe and the surrounding soil is filled (possibly with a hardening and / or lubricating action) via a rod or via a special conduit extending through the tension-following pipe. ) Liquid or pasty substances can be introduced. The use of different auxiliary material conduits with boring rods allows different fluids and different pressures to be used for different roles (eg, cooling, lubrication, mining, and improving fluidity). If the tension rod is formed of concentric pipes, multiple fluids can be introduced into the drilling head. Furthermore, the annular space between the discharge pipe and the product pipe, or at least one of the plurality of pipes drawn in as a bundle, can be used for the introduction of the working fluid.

The outer surface of the tension following pipe may be provided with a rib for preventing corotation with the excavating head. In addition, the opening of the drilling head can be provided with an inwardly opening flap or a kind of non-return valve to prevent the drainage fluid from leaving the drilling head and reaching the soil.

If the drilling head or the intermediate member or the discharge pipe is provided with a nozzle directed in the direction opposite to the direction of advance and / or a feed screw driven via a pulling / rotating rod, the soil discharge can be further improved. .

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS The two embodiments of the invention shown in the drawings are described in detail below.

The drilling head 1 is formed in a cage shape and comprises a vertical web 2 and a horizontal web 3 forming an opening 4 for soil. The longitudinal web 2 has a cutting edge 5 parallel to the axis and a connection 6 for a pilot hole 8 or for a pull rod 7 passing through the old pipe and merges at the tip of the drilling head. The pull rod 7 is connected to the connection 6 of the drilling head 1. The washing liquid flow path 9 passes through the tip of the drilling head to a head nozzle 10 inside the drilling head 1. The flow path 9 has a side flow path 11 branched, and a peripheral nozzle 12 is provided through the side flow path 11 to supply a cleaning liquid to the vertical web 2. The vertical web 2 is further provided with cutter means 13 for mining soil or old pipe surrounding the pilot hole 8 near the drilling head opening 4.

The drilling head 1 is rotatably supported by a rolling bearing 14 on an intermediate member 15 which is screwed to a flange 16 of a discharge pipe 17 and has a connection 18 for a product pipe 19. The connecting member 1 comprises a peripheral surface 20 and an inner support sleeve 21, between which the product pipe 1
9 front end.

The line of the fluid working medium, ie the liquid line 24, extends through the annular space between the discharge pipe 17 and the product pipe 19 to the annular path 25 and
5, the jet nozzle 26 branches. A liquid (for example, water) for facilitating discharge is supplied to the discharge in the intermediate member 15 and the discharge pipe 17 through the nozzle.

When enlarging the pilot hole 8, the cutting blade 5 and the cutter means 13 are provided with the peripheral nozzle 12 of the drilling head 1.
The soil surrounding the pilot hole 8 is peeled off in cooperation with the washing liquid flowing out of the tank. As soon as the soil is removed,
To the interior of the drilling head 1 and then through the head nozzle 10 the cleaning liquid and the peripheral nozzle 12
Is discharged through the intermediate member 15 and the discharge pipe 17 with relatively small friction by the action of the washing liquid accompanying the water.

To reduce the peripheral friction between the product pipe 19 and the surrounding soil, in the case of the drilling head 1 of FIG.
The web channel 11 is provided with a peripheral nozzle 22 for delivering the washing liquid to a narrow annular space between the product pipe 19 and the surrounding soil. In this case, the cleaning liquid not only reduces the peripheral friction, but also the underground hole formed by the excavating head 1 (relatively coarse based on the action of the cutter means 13).
To stabilize. The web nozzle 23 communicating with the inside of the drilling head 1 together with the head nozzle 10 promotes the discharge of the soil from the drilling head 1 through the intermediate member 15 to the discharge pipe 17 at the center.

In the case of the drilling head 1 shown in FIG. 4, in order to further improve the discharge of effluent in the product pipe 19,
A feed screw 28 is provided which is driven from the starting well via the rod 7. Such a feed screw 28 is particularly preferred when the boring length is large, since the circumferential friction in the discharge pipe 17 increases with the feed length.

The fluid line 24 is connected to both the tension following pipes 1.
Via the annular space between 7 and 19, an annular path 25 with jet nozzles 26 is reached, where the fluid
From 6, it flows in the direction of the discharged soil.

[0026]

According to the present invention, mining and discharging of soil surrounding the pilot hole is promoted. Further, there is also an effect of stabilizing the soil surrounding the discharge pipe and reducing the outer peripheral surface friction.

[Brief description of the drawings]

1 shows an axial longitudinal section through a drilling head with an intermediate member (along line II in FIG. 2);

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an axial longitudinal sectional view of a drilling head having a peripheral nozzle.

FIG. 4 is an axial longitudinal sectional view of a drilling head having a mechanical internal feed mechanism (feed screw).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavation head 2 Vertical web 3 Horizontal web 4 Opening 5 Cutting blade 6 Connection part 7 Pull rod 8 Pilot hole 9 Flow path 10 Head nozzle 11 Side flow path 12 Peripheral surface nozzle 13 Cutter means 14 Rolling bearing 15 Intermediate member 16 Flange 17 Discharge pipe 18 Connection part 19 Product pipe 20 Peripheral surface part 21 Support sleeve 22 Peripheral nozzle 23 Web nozzle 24 Fluid conduit 25 Annular path 26 Jet nozzle 28 Feed screw

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Franz-Joseph Puttmann, Germany, 57368 Rennestadt, Winterberger Strasse 52 (72) Inventor Alphonse Hesse, Germany, 57368 Rennestadt, Antonius Strasse 18 (72 Inventor Dieter Wurm, 57399 Kirchhundem, Am Ochsenstein 5 (72) Inventor Gerhard Felkel, Germany, 57339 Eandteb Luc, Mozartstrasse 4 (72) Inventor Karl Bayer, Germany, 45891 Gelsenkirchen , Pieren Kemper Strasse 111

Claims (14)

[Claims] An apparatus for enlarging the cross section of a pilot hole or replacing an old pipe, comprising: a rotatable drilling head (1); and an opening (4) communicating with the inside of the drilling head (1). And a discharge pipe (17) following the drilling head (1)
And a tension rod (7) coupled to the excavating head (1) and the rotary drive device. 2. The device for enlarging the cross section of a pilot hole according to claim 1, wherein the drilling head (1) is rotatably provided on the intermediate member (15). 3. An intermediate member (15) comprising a product pipe (1).
Device according to claim 2, characterized in that it comprises a connection (18) for 9). 4. An intermediate member (15) comprising: a discharge pipe (17);
The device for enlarging the cross section of a pilot hole according to claim 2 or 3, wherein the device is coupled to the pilot hole. 5. The cutting head (1) is provided with cutter means (5, 1).
The device for enlarging the cross section of a pilot hole according to any one of claims 1 to 4, characterized in that the device (3) is provided. 6. The drilling head (1) is provided with a washing liquid nozzle (1).
The device for enlarging the cross section of a pilot hole according to any one of claims 1 to 5, characterized in that the device has (0, 12, 22, 23). 7. A drilling head (1) is provided with a washing liquid flow path (1).
7. The device for enlarging the cross section of a pilot hole according to claim 6, wherein the device includes the following. 8. A flow path (11) in which a tension rod (7) leads to an internal space and a nozzle (10, 12, 22, 23).
Apparatus according to claim 6 or 7, characterized in that it is connected to a connection (6) of a drilling head (1) having: 9. The drilling head (1) comprises a hollow web (2, 2).
9. The apparatus for enlarging the cross section of a pilot hole according to claim 8, wherein the apparatus is configured as in 3). 10. The drilling head (1) has a nozzle (22) pointing rearward parallel to the axis.
An apparatus for enlarging a cross section of a pilot hole according to any one of claims 1 to 9. 11. The rotating / tensioning rod (7) is formed of concentric pipes.
An apparatus for enlarging a cross section of a pilot hole according to any one of the above. 12. A jet nozzle (26) and / or a feed screw (28) acting in a direction opposite to the forward direction.
Crossing a pilot hole according to any one of the preceding claims, characterized in that is provided on the drilling head (1), on the intermediate member (15) or on the tension following pipe (17). A device that enlarges the surface. 13. The pilot hole according to claim 1, wherein the conduit for the fluid working medium is guided via a tension-following pipe. For enlarging the cross section of 14. The cross section of a pilot hole according to claim 1, wherein an opening (4) of the drilling head is provided with a flap or check valve which opens inward. Equipment to expand.