EP2295645B1 - Drilling apparatus and method of making piles in a soil - Google Patents

Description

Such a drill is formed with a drill drive for rotationally driving a drill string and a rotary feedthrough for passing a building material from a building material hose into the interior of the drill string, wherein the rotary feedthrough a first line connection for having the building material hose and a second conduit connection for the drill string rotatable relative to the first conduit connection.

The invention further relates to a method for tillage according to the preamble of claim 12. In such a method it is provided that a drill string is set into a rotational movement by means of a drill drive, and connected via a rotary feedthrough, which at a first line connection to a building material hose and a second conduit connection rotatable relative to the first conduit connection is connected to the drill string, at least temporarily liquid building material is introduced from the building material hose into the interior of the drill string.

A generic drill is for example from the DE 102 38 193 A1 known. The DE 102 38 193 A1 describes as well as DE 203 04 831 U1 , an earth boring machine with which a drilling auger can be rotated and inserted axially into the ground. Furthermore, a feed is provided with which for filling the produced well concrete can be introduced into the interior of the auger. In order to allow an introduction of the concrete into the axially movable screw, the feed has a movable hose line, which is connected on the one hand to a fixed transfer point on the drill and on the other hand to the worm. Due to this flexible hose line it is possible to move the worm up and down relative to the drilling device. The non-rotatably connected to the carrier vehicle hose is connected via a rotary feedthrough, a so-called flushing head to the worm. This rotary feedthrough is intended to decouple the rotational movement of the screw relative to the hose line.

However, since a rotary feedthrough in practice does not work frictionless, it will come in operation despite rotary feedthrough regularly to a torque transfer from the auger to the hose line connection. In order to prevent that in this case the tubing is bent or even wound around the screw or the drill drive when operating the drill drive, the hose line connection can be fixed by means of a torque arm rotationally fixed with respect to the transfer point.

However, such a torque support can be structurally relatively complex especially when the drill string protrudes far above the carrier vehicle and thus arranged at the upper end of the drill string rotary feedthrough is far above the carrier vehicle, since the corresponding distance must be bridged by the torque arm ,

The object of the invention is to develop a generic drill and a generic drilling method so that in a particularly simple manner, a particularly reliable material supply, especially concrete feed, into the interior of the drill string is possible.

The object is achieved by a drill with the features of claim 1 and a method having the features of claim 12. Preferred embodiments of the drill are indicated in the dependent claims.

The drilling apparatus according to the invention is characterized in that the rotary feedthrough has a rotating device for actively rotating the second line connection relative to the first line connection.

A basic idea of the invention can be seen in that a rotating device with drive means is provided on the rotary feedthrough, which allows the two connections of the rotary feedthrough to be actively rotated relative to each other. Especially This active rotary device can be synchronized with the drill drive so that the line connection for the building material hose always points in the same direction even when the drill string rotates, that is, the rotational movement of the drill string can be actively compensated by means of the rotating device according to the invention. This can be effectively prevented that the hose kinks or even wrapped around the drill string or drill drive, so that a reliable concrete supply is ensured. At the same time, a complex torque support of the hose connection is no longer necessary, since the orientation of the hose line connection takes place relative to the fixed transfer point by means of the active rotary device.

The drilling device according to the invention is preferably an earth boring device, in particular an endless screw drilling device with Kelly extension. The rotary feedthrough, which can also be referred to as a flushing head, is expediently arranged on the upper side of the drill string and / or coaxially with the drill string. Through the rotary union, a fluid connection between the interior of the non-rotating building material hose and the interior of the rotating drill string can be established. In the building material, which is introduced from the building material hose into the interior of the drill string, it can be in particular concrete. The drill drive is used for rotationally driving the drill string about the drilling axis, wherein the rotary feedthrough is expediently arranged on the drilling axis.

It is particularly preferred that the rotating means for compensating the rotation of the drill drive is synchronized opposite to the drill drive. This may in particular be understood to mean that the rotating device rotates the two line connections relative to one another with the rotational speed of the drill drive but with the direction of rotation reversed, so that the rotational movements of the drill drive and the rotary device cancel and the line connection for the building material hose outwards even when the drill string is rotating stationary. The synchronization can in particular be effected by means of a controller which controls the rotary device, in particular a corresponding drive motor, in dependence on data on the rotational speed of the drill string and / or drill drive. In principle, however, a mechanical synchronization would be conceivable.

In principle, it would be possible, for example, to operate the active rotary device with mechanical energy which is taken from the drill drive and transmitted to the rotary device, for example, by means of a flexible shaft. However, it is particularly advantageous that the rotating device has at least one drive motor for actively rotating the second line connection relative to the first line connection. For a particularly compact arrangement, this drive motor is suitably arranged on the rotary feedthrough, that is to say usually on the upper side of the drill string.

The drive motor can be, for example, a hydraulic motor, since hydraulic energy is usually available anyway on a typical drill. The drive motor can, however, also be, for example, an electric motor, since it can be controlled particularly easily and thus synchronized. In particular, a servomotor may be provided as a drive motor of the rotary device. In principle, several types of motor, for example, in series, can be combined.

Conveniently, a control for the rotating device is provided according to the invention, in particular an electronic control. By means of such a control, for example, the opposite synchronization can be realized in a particularly simple manner. If a drive motor is provided, the controller is expediently in operative connection with this drive motor, so that the controller can specify, for example, a setpoint speed or a setpoint position to the drive motor.

Furthermore, it is preferred that a rotary sensor is provided for determining the rotational speed and / or the direction of rotation of the drill string and / or the rotary drive, which is in signal communication with the controller. As a result, the controller receives input data on the status of the drill string, so that they can operate counteracting the rotating device accordingly. The rotator controller may obtain information about the status of the drill string, but also from other sources, such as the drill driver control.

The invention can be used particularly advantageously in drilling apparatuses in which the drill string, in particular in several parts, has a tool section running underneath the drill drive and at least partially above it Drill drive extending extension is formed. For in such an embodiment with an elongated drill string, a torque support for the hose connection which is necessary according to the prior art would have to be extended correspondingly far upwards, which would entail a corresponding additional outlay. However, since according to the invention such a torque support can be omitted, also this additional effort is eliminated here.

Conveniently, the rotary feedthrough is arranged on the extension, in particular on the upper side of the extension. For example, the drilling tool, in particular a drilling screw, preferably a so-called endless screw, can be provided on the tool section.

In particular, if an extension is provided, the drill string for drilling depth increase can be mounted axially movable relative to the drill drive. Conveniently, the drill string is mounted in the drill drive in the region of the extension. For active axial movement of the drill string, a corresponding drive device may also be present.

It is particularly advantageous that the drill drive is arranged on a support structure, and that a transfer connection for the building material hose, preferably non-rotatably, is arranged on the support structure. According to this embodiment, therefore, the drill drive and the transfer port for the building material hose are arranged on the same structure, so that the compensation of the rotational movement of the drill drive on the hose is possible in a particularly simple manner. The carrier structure may be, for example, a mast carriage. Such a mast carriage is expediently mounted longitudinally adjustable on a mast. Under certain circumstances, the mast can be considered as the said support structure. In particular, a transfer point can be understood as the transfer point at which the building material can be introduced into the building material line, to which the building material hose can then be connected to a conveying device for the building material, in particular to an associated delivery line.

A further advantageous embodiment of the invention is that the rotary feedthrough at the line connection for the building material hose has a manifold. In this way, it can be ensured that the hose line connection points with the rotary feedthrough mounted to the floor or at least to the side, so that the building material hose from the pipe connection can hang freely without kinking. In particular, it is expedient that the line connection for the building material hose is arranged axially parallel to the line connection for the drill string, as a result of which a rotary feedthrough which can be used particularly reliably is obtained. For this purpose, the manifold preferably has an arc angle of at least approximately 180 °.

Furthermore, it is particularly advantageous for the building material hose to hang down freely from the line connection for the building material hose and / or from the transfer connection. In particular, it can be provided that the building material hose is attached only to the hose ends and is not supported and / or supported in the area between the two ends, ie hangs freely. Since according to the invention the active rotary feedthrough can ensure that the hose line connection of the rotary feedthrough is always in the same angular position with respect to the transfer connection, a support, in particular a torque support, of the hose between the hose ends can be dispensed with.

It is also expedient that the drive motor, preferably above the line connection for the drill string, is arranged on the rotary feedthrough. As a result, a particularly compact arrangement is obtained. For example, it can be provided that the drive shaft of the drive motor extends at least approximately parallel to the drill string and to the drilling axis.

A further preferred embodiment of the invention is that at the first line connection, ie the connection for the hose, or at the second line connection, ie the connection for the drill string, a further rotary feedthrough is connected. By means of such a second rotary feedthrough can be ensured that the building material hose is not overloaded even if, for example, in a fault, the active synchronization of the first active rotary feedthrough can not be performed with sufficient accuracy. If the rotation of the drill string is thus unintentionally or intentionally only partially compensated by the first rotary leadthrough, the remaining difference in the rotation between the rotating drill string and the non-rotating hose connection can be absorbed by the second rotary leadthrough. The further rotary feedthrough is preferably passive, so in contrast to the first Rotary feedthrough no active rotating device. In particular, the two rotary unions can be arranged coaxially. Alternatively or in addition to a further rotary feedthrough, the first active rotary feedthrough between the two line connections can have a friction clutch to protect the building material hose.

The inventive method can be carried out in particular by means of a drilling device according to the invention. It is characterized in that a rotating device is provided for active rotation of the second line connection relative to the first line connection, wherein the rotating device is operated in opposite synchronous with the drill drive. As a result, the rotation of the drill string is compensated at the hose line connection.

Fig. 1

eine Seitenansicht eines erfindungsgemäßen Bohrgerätes;

Fig. 2

eine Detailansicht des Bohrgerätes aus Fig. 1 im Bereich der Drehdurchfüh- rung von der anderen Seite; und

Fig. 3

eine Detailansicht des Bohrgerätes aus Fig. 1 im Bereich der Drehdurchfüh- rung von vorne.

The invention will be explained in more detail below with reference to preferred embodiments, which are shown schematically in the accompanying figures. The figures show:

Fig. 1

a side view of a drilling device according to the invention;

Fig. 2

a detailed view of the drill from Fig. 1 in the area of the rotary union from the other side; and

Fig. 3

a detailed view of the drill from Fig. 1 in the area of the rotary feedthrough from the front.

The FIGS. 1 to 3 show exemplary embodiments of a drilling device according to the invention.

As Fig. 1 shows, designed as a drill auger on a chassis 71, which is designed as a crawler chassis. On the front side of the chassis 71, a mast 72 is arranged, which runs at least approximately perpendicularly in drilling operation in the rule. On the mast 72, a mast carriage 40 is mounted longitudinally displaceable. In turn, a drill drive 10 for rotating a drill string 1 is provided on this mast carriage 40.

The drill string 1 has a tool section 2, which extends below the drill drive 10, and on which a drill screw 9 is arranged as a tool. Above the tool section 2, the drill string has an extension 3. In the area of this extension 3, the drill string 1 is passed through the drill drive 10. The extension 3 is formed as a so-called Kelly extension with outer, along the drill string 1 extending profile strips 75. These profile strips 75 enable a positive torque transmission from the drill drive 10 to the extension 3 of the drill string 1, wherein the drill string 1 is simultaneously moved relative to the drill drive 10.

The drill further has a building material hose 6, by means of which a building material, in particular a hardening building material such as concrete, in the interior of the drill string 1 can be introduced. From the Bohrstranginneren the building material can escape through at least one below the drill string 1 arranged opening 79. This arrangement makes it possible to fill a borehole generated with the drill string 1 in the ground with building material.

The building material hose 6 is connected at its one end to a transfer port 50 At this point, the building material can be passed, for example, from a conveyor into the building material hose 6. The transfer connection 50 is rotationally fixed and axially fixedly arranged on the mast carriage 40. At its opposite upper end of the building material hose 6 is connected to a line connection 21, which is arranged at the upper end of the drill string 1. At this point, the building material from the building material hose 6 can be introduced into the Bohrstranginnere.

The transfer connection 50 is formed at the end on an approximately horizontally extending supply pipe section 53 which is held on the mast carriage 40 via an at least approximately perpendicular support 51. About the support 51, the pipe section 53 and its transfer port 50 rotatably and axially fixed to the mast carriage 40. The pipe section 53 and its transfer connection 50 are located above the mast carriage 40 and above the rotary drive 10. At its end remote from the transfer connection 50, the pipe section 53 has a further connection 54 to which, for example, a supply hose or a rigid supply line can be connected or which is connected to a building material pump.

The transfer connection 50 for the building material hose 6, the line connection 21 for the hose 6 and also the further connection 54 face downwards, that is to say in the direction of the drilling axis to the ground, so that there hoses without kinking can be connected.

The flexible design of the conduit 6 as building material hose makes it possible to compensate for changes in distance between the conduit connection 21 and the transfer connection 50, which occur when the drill string 1 is displaced relative to the drilling drive 10 and thus to the mast carriage 40.

The building material hose 6 is connected via a rotary feedthrough 20 according to the invention with the drill string 1, which in the Figures 2 and 3 is shown in detail. This rotary feedthrough 20 is arranged at the upper end of the drill string 1 and has an axis of rotation which is coaxial with the drilling axis, that is to say coaxial with the drill string 1.

How the particular Figures 2 and 3 show, the rotary feedthrough 20 according to the invention is designed as an active rotary feedthrough with an active rotating means 30, wherein the rotating means 30 comprises a drive motor 32 and a gear 33 which is operable with the drive motor 32. By means of the drive motor 32 and the associated gear 33, the first line connection 21, on which the building material hose 6 is arranged rotatably, active against the second line termination 22, to which the rotary feedthrough 20 in particular rotatably connected to the drill string 1, are rotated about the drilling axis.

For a particularly compact arrangement, the drive motor 32 is arranged above the line connection 22 for the drill string 1 and above the transmission 33. On the drive motor 32 operating and control lines 35 are connected, which lead to the chassis 71.

In the method according to the invention, the active rotary feedthrough 20 is actuated synchronized in opposite directions to the drill drive 10. In this case, the drive motor 32 actively generates a relative rotational movement of the two line connections 21 and 22 to each other, which has the same speed, but the reverse direction of rotation compared to the drill drive 10. As a result, compensates the active rotary feedthrough 20 caused by the drill drive 10 rotation of the drill string 1, so that the line connection 21 for the building material hose 6 and then always in the same Direction points and not rotated when the drill drive 10, the drill string 1 and thus the second line connection 22 rotatably actuated.

To realize such an opposite synchronization is an in Fig. 1 schematically shown control 39 is provided, which is in operative connection with the rotating device 30 and in particular with its drive motor 32 or its transmission 33. This controller 39 is also in signal communication with a rotary sensor 38, which detects the rotation of the drill string 1 relative to the mast carriage 40 and thus relative to the chassis 71. This rotary sensor 38 provides the input to the controller 39.

In the area of the line connection 22 for the drill string 1, a further rotary feedthrough 70 can be provided, which can accommodate remaining differences in the rotational position between the drill string 1 and the hose 6.

The rotary feedthrough 20 has a manifold 60, which forms a pipe bend by about 180 °. End of this manifold 60, the line connection 21 is formed for the building material hose 6. By means of the manifold, the line connection 21 for the building material hose 6 is arranged directed downwards, so that the connected building material hose 6 can enter there without kinking.

Claims (12)

1. Drilling apparatus for working the ground comprising

   - a drill drive (10) for driving a drill string (1) in a rotating manner and

   - a rotary feedthrough (20) for passing a construction material from a construction material hose (6) into the interior of the drill string (1), whereby the rotary feedthrough (20) has a first line connection (21) for the construction material hose (6) and a second line connection (22), rotatable relative to the first line connection (21), for the drill string (1),

   characterized in that

   - the rotary feedthrough (20) has a rotary device (30) for actively rotating the second line connection (22) relative to the first line connection (21).
2. Drilling apparatus according to claim 1,
   characterized in that
   in order to compensate the rotation of the drill drive (10) the rotary device (30) is synchronized diametrically opposed to the drill drive (10).
3. Drilling apparatus according to any one of the preceding claims,
   characterized in that
   the rotary device (30) has at least one drive motor (32) for actively rotating the second line connection (22) relative to the first line connection (21).
4. Drilling apparatus according to claim 3,
   characterized in that
   the drive motor (32) is an electric motor or a hydraulic motor.
5. Drilling apparatus according to any one of the preceding claims,
   characterized in that
   a control (39) for the rotary device (30) is provided and
   in that a rotation pick-up (38) for determining the rotational speed and/or the direction of rotation of the drill string (1) is provided, which is in signal connection with the control (39).
6. Drilling apparatus according to any one of the preceding claims,
   characterized in that
   the drill string (1) is designed with a tool section (2) running below the drill drive (10) and an extension (3) running at least in sections above the drill drive (10), in that the rotary feedthrough (20) is arranged on the extension (3) and in that an auger (9) is provided on the tool section (2).
7. Drilling apparatus according to any one of the preceding claims,
   characterized in that
   the drill drive (10) is arranged on a supporting structure, in particular a mast carriage (40), and
   in that on the supporting structure a transfer connection (50) for the construction material hose (6) is arranged.
8. Drilling apparatus according to any one of the preceding claims,
   characterized in that
   on the line connection (21) for the construction material hose (6) the rotary feedthrough (20) has an elbow (60) and
   in that the line connection (21) for the construction material hose (6) is arranged axially parallel to the line connection (22) for the drill string (1).
9. Drilling apparatus according to any one of the preceding claims,
   characterized in that
   the construction material hose (6) hangs down freely from the line connection (21) for the construction material hose (6).
10. Drilling apparatus according to any one of claims 3 to 9,
    characterized in that
    the drive motor (32) is arranged above the line connection (22) for the drill string (1) on the rotary feedthrough (20).
11. Drilling apparatus according to any one of the preceding claims,
    characterized in that
    onto the first line connection (21) or onto the second line connection (22) a further rotary feedthrough (70) is connected or/and
    in that the rotary feedthrough (20) has a slip coupling between the two line connections (21 and 22).
12. Method for working the ground, in particular by means of a drilling apparatus according to any one of the preceding claims, in which

    - a drill string (1) is set into rotary motion by means of a drill drive (10) and

    - via a rotary feedthrough (20), which is connected at a first line connection (21) to a construction material hose (6) and at a second line connection (22), rotatable relative to the first line connection (22), to the drill string (1), liquid construction material is introduced at least temporarily from the construction material hose (6) into the interior of the drill string (1),

    characterized in that

    - a rotary device (30) for actively rotating the second line connection (22) relative to the first line connection (21) is provided, whereby

    - the rotary device (30) is operated in diametrically opposed synchronization with the drill drive (10).

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