Method and drill head for repairing a connecting line in the ground, in particular for a house connection

Abstract

Method for repairing a connecting line (14) in the ground (15) for a house connection (11), - in which a leak is detected in the connecting line (14) between a transfer point (24) in a building (12) and a connection point (16) on a main supply line (17), - in which the connecting line (14) is detached from the transfer point (24) and from the connection point (16) or cut off adjacent thereto and an interface (25) is formed, - in which a drill head (26) is inserted into one end of the connecting line (14), - in which the drilling head (26) is driven in rotation and with its cutting tool (31) the wall of the connecting line (14) is drilled over its entire length, - in which a supply line (34) is pulled into the drilled connecting line (14), and - in which the supply line (34) is connected to the connection point (16) and transfer point (24) or to the interface (25) arranged adjacent thereto.

Description

[0001] The invention relates to a method for repairing a connecting line in the ground for a house connection and to a drill head for drilling a connecting line in the ground, in particular for a house connection.

[0002] Plastic connecting pipes are used to supply buildings with water, for example. These connecting pipes are laid underground between a connection point of a main supply line and a transfer point in a building. Along such a main supply line, which usually runs beneath a street, several such connection points are provided, for example, to supply the buildings along a street.

[0003] Such plastic connecting lines may have a leak. To repair such a leak, the soil in the area is excavated after the leak has been located. The leak is then removed, and the two resulting interfaces are connected with a sleeve. The excavated area is then filled with soil.

[0004] Such a procedure is time-consuming and costly. Furthermore, the leak in the connecting pipe may be located in areas that are difficult to access or involve major construction work.

[0005] DE 10 2016 103 175 A1 discloses a method for removing a plastic pipe buried underground, such as a gas pipe, a sewage pipe, or the like. This involves first excavating a starting pit at the beginning and a target pit at the end of the pipe to be removed. A drilling device is then set up in the starting pit using a hydraulic unit, and the drill rod is inserted through the plastic pipe to be removed into the target pit. The rotation of the drill rod and the insertion of the drill rod completely mill or chip the plastic pipe in the ground. If the plastic pipe has a bend or curvature, it is necessary to create an intermediate pit in the area of ​​the bend or curvature. A new pipe can also be inserted through the drill rod.

[0006] EP 3 211 284 A1 discloses a method for removing a plastic pipe buried underground. A drilling device is guided along the plastic pipe to be removed via a drill rod. A rotating drive completely destroys the plastic pipe.

[0007] DE 20 2018 104 992 U1 also discloses a conical cutter for removing a plastic pipe laid in the ground.

[0008] DE 39 12 103 C1 discloses a method for the underground replacement of damaged sewer pipes. The damaged sewer pipe is opened using a drilling device. Individual pipe sections are then pressed into place, and a casting compound is then applied using a movable molding and casting device to connect the pressed-in pipe sections.

[0009] DE 43 08 654 A1 discloses a method and device for rehabilitating an underground pipeline. For this purpose, a pig is used, which is pulled through the pipe. This pig comprises cutting tools that break the pipeline. The broken pipe sections are transported away through the interior of a pipe provided on the pig.

[0010] An oscillating milling tool is known from DE 10 2020 206 603 A1.

[0011] The invention is based on the object of proposing a method for repairing a connecting line in the ground, in particular for a house connection, and of proposing a drill head, whereby a cost-effective repair of the connecting line in the ground, in particular for a house connection, is possible.

[0012] This problem is solved by a method for repairing a connecting line in the ground, in particular for a house connection, in which a leak is detected in the connecting line between a transfer point in a building and a connection point on a main supply line, in which the connecting line is detached from the transfer point and the connection point or cut off adjacent thereto and an interface is formed, in which a drilling head is inserted into one end of the main connecting line, in which the drilling head is driven in rotation and with whose cutting tool the wall of the main connecting line is drilled out over its entire length and in which a new supply line is pulled into the drilled-out connecting line and connected to the connection point and the transfer point or the adjacent interface.This method eliminates the need for excavation work or any construction work required to remove the leak. Instead, the repair can be carried out easily in easily accessible areas, such as the connection point to a main supply line located in an existing shaft, or at the transfer point into a building. By pulling a new supply line into the drilled-out connecting line, the repair can be carried out very cost-effectively. Furthermore, the precise location of the leak is not required. Simply identifying the leak is sufficient, as, for example, sufficient pressure cannot build up in the connecting line.In addition, this method has the advantage that not only connecting lines that run in a straight line from the connection point of the main supply inlet to the transfer point in the building can be repaired, but also connecting lines that include at least one bend or a diversion.

[0013] Preferably, the connecting line is drilled to a nominal diameter that corresponds to an outer diameter of the supply line and a gap remaining between the nominal diameter and the outer diameter of the supply line. This makes it easier to pull or push the supply line into the connecting line to be repaired. The connecting line and the supply line preferably have standardized sizes that include graduated diameters. Preferably, the connecting line is drilled in such a way that the supply lines can be inserted with a diameter one step smaller in nominal diameter than the connecting line. This usually still allows a sufficiently large flow rate of medium, in particular water.

[0014] The method preferably provides for air, in particular cooling air, to be blown into the other end of the connecting line, which is opposite the end into which the drill bit is inserted, before or during the drilling process. This air or cooling air can preferably be generated with a compressor. This not only cools the interface in the main connecting line, but also allows the chips generated during drilling to be removed and not accumulate in front of the drill bit.

[0015] Furthermore, it is preferably provided that, before drilling the main connecting line, the drill head is connected to a spindle via a coupling, and the spindle is driven in rotation by a drive during drilling of the main connecting line. The spindle can be driven manually and / or by the drive in the feed direction. This makes it possible to drill the wall even in a connecting line that does not have a straight line.

[0016] Furthermore, it is preferably provided that after the connecting line has been completely drilled out, the drill head is released from the spindle coupling, the spindle is pulled out of the drilled-out connecting line, and the new supply line is then inserted into the drilled-out connecting line. The connecting line can be inserted either from the connection point or from the transfer point.

[0017] Alternatively, after the connecting line has been completely drilled out, the drill head can be released from the spindle coupling, the supply line can be connected to the spindle coupling, and the supply line can be simultaneously pulled into the house termination line while the spindle is pulled out of the connecting line. An additional insertion of the supply line can also be provided.

[0018] Another alternative design provides that after the supply line has been completely drilled out, the drill head is released from the spindle coupling, a pull cable is connected to the spindle coupling, and the pull cable is retracted into the supply line while the spindle is withdrawn from the supply line. The supply line is then retracted into the drilled-out supply line using the pull cable. This arrangement can be used in particular when several bends must be negotiated between the connection point and the transfer point in the supply line.

[0019] The invention, as well as further advantageous embodiments and developments thereof, are described and explained in more detail below with reference to the examples shown in the drawings. The features shown in the description and the drawings can be used individually or in any combination according to the invention. They show: Fig. 1 a schematic sectional view of a connecting line in the ground for a house connection, Fig. 2 a schematic view from above of the arrangement according to Fig. 1, Fig. 3 a schematic view of a first method step for repairing a connecting line, Fig. 4 a schematic side view of a further step of the method for repairing the connecting line, Fig. 5 a perspective view of a drill head, Fig. 6 a schematic side view of the drill head according to Fig. 5, and Fig. 7 a schematic sectional view along the line VI-VI in Fig. 6.

[0020] In Fig. 1 shows a schematic sectional view of a house connection 11. The Fig. 2 shows a schematic view from above of the house connection 11 according to Fig. 1. To supply a building 12 with a medium, in particular water or gas, a connecting line 14 is provided. This connecting line 14 is designed as a plastic pipe, in particular made of rigid or soft PE. This connecting line 14 is connected on the supply side to a connection point 16. This connection point 16 can, for example, be provided on or adjacent to a main supply line 17. Such main supply lines 17 are usually provided beneath a road 18 or a path or adjacent thereto, and the connection point 16 is accessible via a shaft 19. A distributor 21 or a so-called distributor drum is provided on the main supply line 17, each of which comprises a shut-off valve 22 for a connecting line 14 connected thereto. The connecting line 14 can be connected to this shut-off valve 22.Alternatively, it can also be provided that a line section is led out of the shaft 19, and then the line section and the connecting line 14 form an interface 25, which is connected by a screw connection 23. Both the screw connection 23 and the connection to the shut-off valve 22 are understood as connection point 16.

[0021] The connecting line 14 enters building 12, usually in the basement, and is connected to a transfer point 24. This transfer point 24 also has a meter, specifically a water meter. The individual connections in building 12 are supplied from the transfer point 24.

[0022] The supply line 17 is, as in Fig. 1, laid in the ground 15. In the event of a leak in the connecting line 14, the repair procedure described in more detail below is carried out, whereby the connecting line 14 remains in the ground 15 and excavation work or other construction measures to reach the leak point of the connecting line 14 are not required.

[0023] First, the shut-off valve 22 in the distributor 21 is actuated to prevent any further supply of medium to the connecting line 14. The connecting line 14 can then be emptied via a connection on or in the building 12. The connecting line 14 is then disconnected at the connection point 16 and at the transfer point 24. Alternatively, for example, the screw connection 23 can be loosened or a cut can be made in this area. A drill head 26 is then inserted into one end of the connecting line 14. This drill head 26 is connected via a coupling to a spindle 27 which is wound on a reel 28. This reel can be inserted into a housing. The spindle 27 is driven in rotation by a drive 30. The rotating spindle 27 can be inserted manually into the connecting line 14 in the feed direction according to arrow 39.In addition, a feed mechanism can be provided in the drive 30 so that the spindle 27 is inserted into the connecting line 14 in a rotating and / or feed manner.

[0024] The drive 30 can have an actuating lever 39, by means of which a driver in the drive 30 can be activated in order to drive the spindle 27 in rotation.

[0025] The spindle 27 has a length of, for example, 2 m to 4 m. A coupling at each end of the spindles 27 allows several spindles 27 to be connected in series. The drill head 26 comprises a cutting tool 31. For example, the cutting tool 31 can be formed by one or two cutting inserts or indexable inserts. The drill head 26 is inserted into one end of the connecting line 14 and driven both in rotation and in the feed direction towards the opposite end of the connecting line 14. As a result, the wall of the connecting line 14 is machined and expanded to a nominal diameter, so that a thin wall remains. At the opposite end of the supply line 34, air, in particular cooling air, is preferably blown in by means of a compressor 32. As a result, the chips are blown out in the opposite direction to the feed direction of the drill head 26.

[0026] Once the connecting line 14 has been completely drilled out, the drill head 26 can be detached from the spindle 27. Preferably, the drill head 26 is detachably connected to the spindle 27 via a coupling 29. The spindle 27 is then guided out of the connecting line 14 in the opposite direction and preferably wound onto a reel 28. A supply line 34 is now inserted into the connecting line 14. This can be done at the same time as the spindle 27 is guided out. Once the supply line 34 has been completely pulled into the connecting line 14, the respective ends of the supply line 34 are connected and connected to the connection point 16 and the transfer point 24.

[0027] The connecting cable 14 remaining in the ground serves as a protective cover for the supply cable 34.

[0028] In Fig. 5 shows a perspective view of the drill head 26. The Fig. 6 shows a schematic side view and the Fig. 7 a schematic sectional view along the line VI-VI in Fig. 6. The drill head 26 comprises a drill body 36. A part 37 of the coupling 29 is provided at one end of the drill body 36. A centering section 38 is arranged at the opposite end of the drill body 36.

[0029] The drill body 36 has a guide section 39 on its outer circumference. The outer circumference of the drill body 36 is interrupted by a chip space 41. A receptacle 42 for a cutting tool 31 is provided facing this chip space 41. Advantageously, an indexable insert is releasably secured in the receptacle 42. The chip space 41 has an opening angle of, for example, 90°. This also makes it possible to create a passage parallel to the longitudinal axis 43 of the drill head 26, which extends along the centering section 38 to part 37 of the coupling 39.

[0030] Preferably, two receptacles 42 are provided, offset by 180° or nearly 180° from one another, each of which accommodates a cutting tool 31. This forms opposing segments of the guide section 39, each of which forms a quarter-circle segment.

[0031] The centering section 38 is cylindrical, with the chip space 41 extending into the centering section 38. A rounded transition 45 to the end face 46 of the centering section 38 is provided at the front end of the centering section 38.

[0032] The coupling 39 is designed, for example, as a detachable plug-in coupling, preferably with a snap-in connection. For example, a T-shaped section provided on the spindle 37 can be inserted into the part 37. Through this groove-like recess in the part 37 and a T-shaped connecting piece forming the coupling 39, both a rotary movement and a feed movement can be transmitted from the spindle 27 to the drill head 26.

Claims

[1] Method for repairing a connecting line (14) in the ground (15) for a house connection (11), - in which a leak is detected in the connecting line (14) between a transfer point (24) in a building (12) and a connection point (16) on a main supply line (17), - in which the connecting line (14) is detached from the transfer point (24) and from the connection point (16) or cut off adjacent thereto and an interface (25) is formed, - in which a drill head (26) is inserted into one end of the connecting line (14), - in which the drilling head (26) is driven in rotation and with its cutting tool (31) the wall of the connecting line (14) is drilled over its entire length, - in which a supply line (34) is pulled into the drilled connecting line (14), and - in which the supply line (34) is connected to the connection point (16) and transfer point (24) or to the interface (25) arranged adjacent thereto. [2] Method according to claim 1, characterized by that the connecting line (14) is drilled to a nominal diameter which corresponds to an outer diameter of the supply line (34) and a gap remaining between the nominal diameter and the outer diameter. [3] Method according to claim 1 or 2, characterized by that before or during the drilling of the connecting line (14) air, preferably cooling air, is blown into the connecting line (14) opposite to the feed direction of the drill head (26). [4] Method according to one of the preceding claims, characterized bythat before drilling out the connecting line (14), the drilling head (26) is connected to a spindle (27) via a coupling (29) and the spindle (27) is driven by hand or by a drive in a rotating and / or feed direction manner with the drilling head (26) in order to drill out the connecting line (14). [5] Method according to claim 4, characterized by that after the connecting line (14) has been completely drilled out, the drilling head (26) is released from the coupling (29) to the spindle (27) and the spindle (27) is pulled out of the drilled out connecting line (14) and the supply line (34) is pushed into the drilled out connecting line (14). [6] Method according to claim 4, characterized bythat after the connecting line (14) has been completely drilled out, the drilling head (26) is released from the coupling (29) to the spindle (27) and the supply line (34) is connected to the spindle (27) via the coupling (29) and the supply line (34) is pulled into the connecting line (14) while the spindle (27) is pulled out of the connecting line (14). [7] Method according to claim 4, characterized by that after the connecting line (14) has been completely drilled out, the drill head (26) is released from the coupling (29) to the spindle (27) and a pulling cable is connected to the spindle (27) via the coupling (29) and the pulling cable is pulled into the connecting line (14) while the spindle (27) is being pulled out of the connecting line (14) and then the supply line (34) is pulled into the drilled-out connecting line (14) using the pulling cable.

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