EP2236734B1 - Drive unit with alignment means - Google Patents

Abstract

The unit (10) has a carriage (20) for moving a mast of a boring or construction device along a moving axis (12). External and interior tubing drives (30, 40) are provided for driving two tubular drill pipes around two longitudinal axes, respectively. Two drives are arranged on the carriage around a transverse axis (16) that runs perpendicular to the moving axis. The longitudinal axes run coaxially to each other to form a common drilling axle (14). An adjusting device adjusts one of the longitudinal axes of the two drives and changes the moving axis of the carriage.

Description

The invention relates to a drive unit for a drilling or construction equipment according to the preamble of claim 1.

Such a drive unit has a carriage, which is designed for the method on a mast of the drilling or construction equipment along a track axis. The drive unit further includes an outer tube drive for rotatably driving a first tubular drill string about a first longitudinal axis and an inner tube drive for rotationally driving a second drill string disposed within the first drill string about a second longitudinal axis. The outer tube drive and the inner tube drive are arranged on the carriage and the two longitudinal axes are substantially coaxial with each other and form a common drilling axis.

The invention further relates to a drilling or construction equipment with a mast.

A generic drive unit is for example from the DE 10 2006 059 171 B3 or the DE 44 02 487 A1 out.

Drive units of the above type are used in particular in so-called double-head drilling. Double head drilling is a drilling method in which two generally counter-rotating auger drives, namely an outer tube drive and an inner tube drive, simultaneously rotate an outer drill string and an inner drill string. The outer drill string is usually a hollow tube, which may also be referred to as a drill pipe. The inner drill string is concentrically disposed within the drill pipe and may include, for example, a drill bit.

The drilling tool formed from outer drill pipe and inner drill rod, which can also be referred to as a double rod, has a high rigidity. Double-head drilling is therefore preferred in the production of overcut bored pile walls.

In the described drive units and the corresponding drilling or construction equipment occurs due to the high loads, which result from the opposite rotation of the outer and inner drill pipe, high wear on the drill drives, especially at their camps on.

From the US 4,878,546 is a pivotable head drive for a drilling known. As a result, an alignment of the head drive to a longitudinal axis of a drill pipe is possible.

The invention is therefore based on the object to provide a drive unit for a drilling or construction equipment and a corresponding drilling or construction equipment, which have the lowest possible load on the bearing of the auger drives.

The object is achieved by a drive unit with the features of claim 1 and a drilling or construction equipment with the features of claim 11. Preferred embodiments are given in the dependent claims.

The drive unit according to the invention is characterized in that an adjusting device is provided, with which an alignment of at least one of the longitudinal axes of the outer tube drive or the inner tube drive to the travel axis of the carriage is variable and adjustable.

The invention is based on the recognition that in operation the components are not exactly aligned, which leads to a forced gear. In particular, an angled or staggered position of the longitudinal axis of the outer tube drive and / or the longitudinal axis of the inner tube drive to the travel axis of the carriage can lead to a significantly increased bearing load on the corresponding drill drive.

A basic idea of the invention is therefore to readjust by means of an adjusting device at least the longitudinal axis of the outer tube drive or the longitudinal axis of the inner tube drive to the travel axis of the carriage in the millimeter or centimeter range, so that they run as parallel as possible. Advantageously not only the longitudinal axis of a drill drive, but both longitudinal axes are aligned to the travel axis of the carriage. After alignment of the longitudinal axes of the auger drives the common drilling axis is substantially parallel to the travel axis the carriage, which in turn runs substantially parallel to a longitudinal axis of the mast.

It is particularly preferred according to the invention, when the outer tube drive and / or the inner tube drive is mounted on the carriage about a transverse axis which is substantially perpendicular to the travel axis of the carriage, pivotably. For this purpose, the drilling drives can be mounted, for example, in each case via two rod-like or wave-like suspensions on the carriage. These suspensions thus form an axis of rotation about which the drilling drives are rotatable or pivotable. The transverse axis preferably runs parallel to a guide surface between the carriage and the mast. As a result, in particular tilting of the drilling drives in the direction of the guide surface or the mast can be compensated.

A preferred embodiment of the invention is that the adjusting device comprises adjusting means, in particular adjusting screws and / or adjusting cylinders, for adjusting the outer tube drive and / or the inner tube drive relative to the carriage. The adjusting means are preferably connected on the one hand to the carriage and on the other hand to the corresponding drill drive, so that the outer tube drive and the inner tube drive can each be pivoted independently relative to the carriage.

The adjusting means can in principle be designed as desired. However, it is particularly preferred if the adjusting means have adjusting screws, because they allow by their thread a particularly fine adjustment of the outer tube drive or the inner tube drive.

The auger drives are exposed to great forces during their operation. It is therefore preferred according to the invention that fastening means, in particular fastening screws and / or fastening bolts, are provided, with which the outer tube drive and / or the inner tube drive can be fixed in a defined orientation on the carriage. Appropriately, the outer tube drive or the inner tube drive can be pivoted by means of the adjusting device in the desired orientation and then fixed by means of the fastening means in this position. In the operation of the drilling or construction equipment, the adjusting device is thus exposed to no greater forces, so that the Justification must be dimensioned only for the purpose of pivoting the corresponding drill drive.

A structurally particularly simple and at the same time reliable fixing is achieved in that a flange fastening is provided for fastening the outer tube drive to the slide, which has a flange element with through holes and fastening means, in particular fastening screws and / or fastening bolts.

In order to enable attachment of the outer tube drive and / or the inner tube drive in different pivoting positions, it is preferred according to the invention that the fastening means, in particular fastening screws and / or fastening bolts are arranged with play in the through holes. Within a certain tolerance of the outer tube drive or the inner tube drive can be pivoted so while the fasteners remain arranged in the through holes. Advantageously, the through holes are adapted in their shape to the path of movement of the fastening means and designed, for example, ring-segment-shaped.

Within the relevant Verschwenkungsbereichs is thus always given a possibility of attachment of the outer tube drive or the inner tube drive. By this structural design, a pivotability of up to a few degrees, in particular up to 5 degrees can be achieved.

In a preferred embodiment of the flange fastening, the flange element with the through-holes is rigidly connected to the carriage. The attachment means are fixed or releasably connected to the corresponding drill drive and passed through the through holes in the flange. Upon pivoting of the corresponding drill drive, the fasteners move within the fixed through holes of the flange.

In an alternative embodiment of the flange attachment, the flange element with the through-holes is rigidly connected to the outer tube drive and / or the inner tube drive. Accordingly, the fastening means are fixedly or detachably connected to the carriage and through the through holes in the flange member passed. Upon pivoting of the corresponding drill drive, the through-holes of the flange member move around the fixed fasteners.

In principle, as shown above, it can be provided that each drill drive can be pivoted independently of the slide. However, it may also be expedient to pivot outer tube drive and inner tube drive together in order to keep the relative alignment of the respective longitudinal axes constant relative to one another. For this purpose, it is provided according to the invention that the outer tube drive and the inner tube drive are mounted on at least one common mounting flange. By pivoting this mounting flange outer tube drive and inner tube drive are pivoted together, so that in a simple way an alignment of the common drilling axis can be done to the travel axis of the carriage.

A further possibility for joint pivoting of outer tube drive and inner tube drive can be achieved in that the inner tube drive is connected via a substantially rigid connecting element with the outer tube drive, wherein the inner tube drive is pivotable together with the outer tube drive. The connecting element may for example comprise a connecting frame, a connecting plate or a plurality of connecting arms, which are arranged substantially between the outer tube drive and the inner tube drive and in each case firmly connected thereto.

In order to enable a relative pivoting of the two drilling drives to each other even with common pivoting of outer tube drive and inner tube drive relative to the carriage, it is preferred according to the invention that the inner tube drive by means of the adjusting device relative to the outer tube drive is pivotable.

According to this embodiment of the invention, the longitudinal axes of outer tube drive and inner tube drive can be adjusted on the one hand together to the travel axis of the carriage or to the longitudinal axis of the mast. On the other hand, in case of a deviation of the longitudinal axis of the inner tube drive from the longitudinal axis of the outer tube drive, the inner tube drive can be additionally adjusted to the outer tube drive. For joint adjustment of outer tube drive and inner tube drive preferably first adjusting means are provided, which are connected on the one hand with the carriage and on the other hand with the outer tube drive. In order to additionally adjust the inner tube drive relative to the outer tube drive, second adjusting means are provided, which are connected on the one hand with the outer tube drive and on the other hand with the inner tube drive. First and second adjusting means are preferably each adjusting screws and / or adjusting cylinder.

In order to achieve the most accurate alignment of the auger drives, it is preferred that a measuring device is provided for determining the orientations of the outer tube drive and / or the inner tube drive.

The drilling or construction equipment with a mast is characterized in that a drive unit according to one of claims 1 to 10 is arranged longitudinally displaceably on the mast. This results in the advantages discussed in connection with the drive unit.

Fig. 1

eine Seitenansicht einer erfindungsgemäßen Antriebsein- heit.

The invention will be further described below with reference to a preferred embodiment, which is shown schematically in the accompanying drawing. In the drawing shows:

Fig. 1

a side view of a drive unit according to the invention.

The drive unit 10 shown in the figure has a carriage 20, which is provided for arrangement on a mast, not shown, of a drilling or construction equipment. The drive unit 10 further comprises two auger drives, namely an outer tube drive 30 for rotationally driving a first drilling element and an inner tube drive 40 for rotationally driving a second drilling element.

For axially propelling the drilling elements, the carriage is displaceably mounted along a travel axis 12 on the mast. The guide of the carriage 20 on the mast by means of guide surfaces, which are formed on the carriage 20 and designed to rest against a corresponding mating surface of the mast.

The illustrated carriage 20 includes a carriage bottom 22 and a carriage top 24.

The carriage bottom part 22 is provided for placement on the mast of the drilling or construction equipment. The corresponding guide surfaces are located on a rear side of the slide lower part 22 and, in the illustrated embodiment, are designed as guide claws 26.

The auger drives are arranged on the carriage upper part 24. The outer tube drive 30 is arranged in a lower region of the carriage upper part 24 in the direction of the borehole to be created and serves for the rotational driving of a first, tubular drill string. The inner tube drive 40 is arranged in an upper region of the carriage upper part 24 remote from the borehole and serves for rotationally driving an upwardly projecting second solid drill rod, which may be formed, for example, with a drill spiral. Outer tube drive 30 and inner tube drive 40 are arranged substantially in extension to each other, so that a longitudinal axis of the outer tube drive 30 and a longitudinal axis of the inner tube drive 40 are substantially coaxially aligned with each other and form a common drilling axis 14, but also some deviations may occur.

The carriage upper part 24 is pivotable relative to the carriage base 22 for maintenance purposes and / or for fitting with drill rods or other drilling elements. For pivoting the carriage upper part 24 relative to the slide lower part 22, a pivoting cylinder 28 is provided, which is articulated on the one hand to the slide base 22 and on the other hand on the carriage upper part 24. The carriage upper part 24 is pivotable relative to the carriage lower part 22 about a pivot axis 17. The pivot axis 17 extends parallel to the guide surfaces and parallel to a mast front side, on which the carriage 20 is slidably mounted.

With a pivoting of the carriage upper part 24 and the auger drives, so outer tube drive 30 and inner tube drive 40, which are arranged on the carriage upper part 24, pivoted together with this relative to the slide lower part 22. The pivotability of the carriage upper part 24 with the drill drives relative to the slide lower part 22 can lead to an inaccurate alignment of the drill drives to the travel axis 12 of the carriage 20.

In order to align the longitudinal axes of the drilling drives, if necessary, again to the travel axis 12 of the carriage 20, an adjusting device is provided, which allows a fine adjustment of the longitudinal axes.

For aligning the outer tube drive 30, this is pivotable about a transverse axis 16, which runs parallel to the pivot axis 17 and transversely to the drilling axis 14. For active pivoting of the outer tube drive 30 are laterally offset from the transverse axis 16 first set screws 50 are provided which are connected on the one hand to the carriage 20 and on the other hand with the outer tube drive 30 and allow fine adjustment. In the illustrated embodiment, the adjusting screws 50 with an adjusting flange 52 of the outer tube drive 30, for example via a threaded engaged. The adjusting flange 52 is fixedly connected to the outer tube drive 30. By turning the screws 50, the distance between the adjusting flange 52 and the carriage base 22 is adjusted and so there is a pivoting of the adjusting flange 52 and thus of the outer tube drive 30 about the transverse axis 16. The pivoting is schematically indicated by arrows 18 indicated.

After an adjustment of the outer tube drive 30, this can be fixed in the desired position. The outer tube drive 30 can be fastened to the carriage 20 via a flange attachment 60 for this purpose. The flange attachment 60 comprises a flange element with through-holes, in which fastening screws 62 are accommodated for fastening the outer tube drive 30 to the carriage 20. The through-holes of the flange member have a diameter which is larger than the outer diameter of the fixing screws 62, so that the fixing screws 62 are accommodated with clearance in the through-holes and allow some pivoting before tightening.

The inner tube drive 40 is rigidly connected to the outer tube drive 30 via a connecting element 70, so that the inner tube drive 40 is pivoted together with the outer tube drive 30 when pivoting.

For adjusting the inner tube drive 40 relative to the outer tube drive, the adjusting device has second adjusting screws 51, which are connected in the illustrated embodiment on the one hand with the connecting element 70 and on the other hand with the inner tube drive 40. Basically, the second set screws 51 for adjusting the inner tube drive 40, as shown above, but also be connected to the carriage 20, so that both auger drives are independently adjustable. Storage and attachment of the inner tube drive 40 can be carried out in basically the same way as the storage and attachment of the outer tube drive 30.

Overall, with the drive unit 10 according to the invention, the longitudinal axes of an outer tube drive and an inner tube drive can be aligned in a simple and precise manner to the travel axis 12 of the carriage 20 and the desired drilling axis and brought into alignment with each other. As a result, forces occurring in the bearings of the auger drives can be reduced, whereby the wear on the corresponding parts is reduced.

Claims (10)

1. Drive unit for a drilling or construction apparatus comprising

   - a carriage (20) which is designed for movement on a mast of the drilling or construction apparatus along a movement axis (12),

   - an outer pipe drive (30) for rotationally driving a first, tubular drill rod about a first longitudinal axis and

   - an inner pipe drive (40) for rotationally driving a second drill rod, arranged inside the first drill rod, about a second longitudinal axis,
   wherein

   - the outer pipe drive (30) and the inner pipe drive (40) are arranged on the carriage (20) and

   - the two longitudinal axes run substantially coaxially to each other and form a common drilling axis (14),
   characterized in that
   an adjusting means is provided, with which an alignment of at least one of the longitudinal axes of the outer pipe drive (30) or the inner pipe drive (40) with respect to the movement axis (12) of the carriage (20) can be changed and adjusted and
   in that the outer pipe drive (30) and the inner pipe drive (40) are supported on at least one common fastening flange.
2. Drive unit according to claim 1,
   characterized in that
   the outer pipe drive (30) and/or the inner pipe drive (40) is pivotably supported on the carriage (20) about a transverse axis (16) which runs substantially perpendicularly to the movement axis (12) of the carriage (20).
3. Drive unit according to any one of claims 1 or 2,
   characterized in that
   the adjusting means comprises positioning means, in particular positioning screws (50, 51) and/or positioning cylinders, for adjusting the outer pipe drive (30) and/or the inner pipe drive (40) with respect to the carriage (20).
4. Drive unit according to any one of claims 1 to 3,
   characterized in that
   fastening means, in particular fastening screws (62) and/or fastening bolts, are provided, with which the outer pipe drive (30) and/or the inner pipe drive (40) can be fastened in a defined alignment on the carriage (20).
5. Drive unit according to any one of claims 1 to 4,
   characterized in that
   for fastening the outer pipe drive (30) and/or the inner pipe drive (40) on the carriage (20) a flange fastening (60) is provided, which has a flange element with through-bores and fastening means, in particular fastening screws (62) and/or fastening bolts.
6. Drive unit according to claim 5,
   characterized in that
   for fastening the outer pipe drive (30) and/or the inner pipe drive (40) in different pivot positions the fastening means are arranged with clearance in the through-bores.
7. Drive unit according to any one of claims 1 to 6,
   characterized in that
   the inner pipe drive (40) is connected to the outer pipe drive (30) via a substantially rigid connecting element (70), wherein the inner pipe drive (40) is pivotable together with the outer pipe drive (30).
8. Drive unit according to any one of claims 1 to 7,
   characterized in that
   the inner pipe drive (40) is pivotable with respect to the outer pipe drive (30) by means of the adjusting means.
9. Drive unit according to any one of claims 1 to 8,
   characterized in that
   a measuring means for determining the alignments of the outer pipe drive (30) and/or the inner pipe drive (40) is provided.
10. Drilling or construction apparatus with a mast,
    characterized in that
    a drive unit (10) according to any one of claims 1 to 9 is arranged in a longitudinally displaceable manner on the mast.

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