EP3877624B1 - Kelly bar assembly for a drill and method for working soil - Google Patents

Description

The invention relates to a Kelly rod arrangement for a drilling device, in particular an earth drilling device, with a tubular outer Kelly rod, which is designed to rest on a drilling drive and to absorb a drilling torque of the drilling drive, and with an inner Kelly rod, which is movably mounted inside the outer Kelly rod and has a cable suspension , wherein the drilling torque can be transmitted between the outer kelly rod and the inner kelly rod, according to the preamble of claim 1.

A generic Kelly bar arrangement according to the preamble is from DE 43 33 114 C1 famous. According to this disclosure, the rotor of the rotary feedthrough for the pressure fluid is passively driven in a known manner. This passive entrainment is prone to failure in the harsh environmental conditions that usually prevail on construction sites.

the EP 2 821 585 A1 discloses a drill rod assembly that also includes a rotary union for pressurized fluid. Here, too, the rotor rotates passively, which is carried along in relation to the stator sleeve.

the EP 3 228 756 A1 discloses a construction machine with a drill rod. This disclosure does not show any details of a possible pressurized fluid rotary union and thus only represents a possible use for drill strings.

Furthermore, the invention relates to a method for tilling the soil, in which a Kelly bar arrangement is set in rotary motion by means of a drill drive, with a soil tillage tool being attached to an inner Kelly bar of the Kelly bar arrangement, which tills a soil, according to the preamble of claim 12.

Kelly bar arrangements for a drill have long been known in foundation engineering. Such kelly rod arrangements are telescopic and have an outer outer kelly rod which is connected to a drilling drive of the drilling device in a rotating connection. An inner kelly rod and optionally further intermediate kelly rods are arranged inside the outer kelly rod, which are mounted in the outer kelly rod and in relation to one another in an axially displaceable manner. The inner kelly bar has a cable suspension so that the inner kelly bar and also the entire kelly bar arrangement can be held on the cable and moved vertically.

For torque transmission, axially running stop strips are provided on the outer and inner sides of the individual Kelly bar elements, which allow both axial displacement and torque transmission in the circumferential direction.

Such a Kelly bar arrangement enables efficient cable suspension of a soil cultivation tool with the simultaneous possibility of torque transmission. In addition, the telescoping capability of the individual Kelly bar elements relative to one another makes it possible to reach working depths that are greater than the height of the mast of a drilling rig.

Kelly bar assemblies of this type are used for working with simple mechanical tillage tools, such as a drill bucket or an auger. The use of a Kelly bar arrangement becomes problematic when a medium, such as a flushing liquid or a pressurized fluid, is to be supplied from the outside.

The invention is based on the object of specifying a Kelly bar arrangement and a method for tilling the soil with a Kelly bar arrangement, which can be used in a particularly diverse manner.

According to the invention, the object is achieved on the one hand by a Kelly bar arrangement according to claim 1 and on the other hand by a method according to the features of claim 12. Preferred embodiments are given in the dependent claims.

The Kelly bar arrangement according to the invention is characterized in that at least one line is arranged on the inner Kelly bar, that a rotary feedthrough with a first end section and a second end section is arranged at a lower or upper end region of the inner Kelly bar, the first connection section being non-rotatably connected to the Kelly bar that can be driven in rotation and forms a line connection to the at least one line of the inner kelly rod and the second connection section is connected to a supply line, which is stationary relative to the inner kelly rod that can be driven in rotation, and that a rotary device for actively rotating the two connection sections relative to one another is arranged on the rotary feedthrough.

A first aspect of the invention is to provide a rotary union on the inner kelly rod. A swivel is an element that enables a line connection between a rotating part and a part that is stationary relative to it. This rotary bushing can be arranged on a lower or upper end area of the inner Kelly rod. At least one line is preferably provided along the inner Kelly bar, which leads from the upper end area to a lower area of the Kelly bar. Alternatively, the rotary leadthrough is arranged on a lower end area of the inner kelly rod, in which case the line rotating with the inner kelly rod can be correspondingly shorter. On the other hand, the relatively fixed feed line can be routed within the inner cavity of the inner kelly rod from above to the second connection section of the rotary feedthrough at the lower end area.

According to a further aspect of the invention, a rotary device for actively rotating the two connection sections relative to one another is arranged on the rotary feedthrough. The invention is based on the finding that the upper end of the inner kelly rod can be moved to a lower end region of the outer kelly rod, for example when the kelly rod arrangement is telescoped out. Thus, a necessary reliable mechanical support of the rotary feedthrough against a part that is stationary relative to the rotating Kelly bar arrangement becomes practically impossible. There is a risk of the feed line rotating with the rotating inner kelly rod.

In order to prevent undesired twisting of the stationary supply line, which is routed from the drill to the rotary bushing on the inner kelly rod, for example, in order to prevent the rope with which the inner kelly rod is suspended, a rotary device is provided for actively twisting the two connection sections relative to one another. In this way, an undesired wrapping of the supply line around the cable can be counteracted in a targeted manner.

In this way, a Kelly bar arrangement with the advantageous cable suspension and the telescoping capability with simultaneous torque transmission can also be used for tillage tools in which the supply of a fluid, energy or data via a supply line from the outside is necessary or desired.

In principle, the rotary feedthrough can be arranged at any point on the upper end area of the inner kelly rod. According to one embodiment variant of the invention, it is particularly advantageous that the rotary leadthrough is arranged on the inner kelly rod below the cable suspension. The rotary feedthrough can be ring-shaped, with the cable suspension being able to be arranged in a central area of the rotary feedthrough.

A further preferred embodiment of the invention is that the rotating device has at least one drive motor for actively rotating the second connection section relative to the first connection section. In principle, further drive motors can also be provided.

It is particularly preferred that the drive motor is arranged on the second connection section, which lies above the first connection section. There is good accessibility to the drive motor. In addition, energy can be supplied to the drive motor in parallel or with the supply line.

For a compact design, it is generally advantageous that the drive motor is an electric motor or a hydraulic motor. In this case, the drive motor can be designed to be very compact overall, since only relatively low torques have to be applied for the necessary compensation for the rotational movement between the two connection sections. In principle, a compressed air motor can also be provided.

A further advantageous embodiment of the invention is that the cable suspension has a cable swivel. A swivel within the meaning of the invention is a swivel joint which enables a lower linkage of the swivel to the inner kelly rod to be twisted in relation to an upper linkage of the swivel to the suspension rope. A rope swivel can be used to ensure that a rotary movement of the inner kelly rod, which is attached to the lower linkage of the rope swivel, cannot be transferred to the upper part of the rope swivel and thus to the rest of the rope. In this way, twisting of the suspension cable can be reliably avoided.

In principle, the line of the inner Kelly rod can be designed as a hollow line, for example a hose or a tube or as a cable for conducting electrical current or data. According to a further development of the invention, it is particularly expedient that an axial cavity of the inner Kelly rod is provided as a line, which cavity is designed for the passage of a fluid. The fluid can in particular be a flushing liquid or a concrete suspension. A connection area can be provided at the lower end of the inner kelly rod, with which a line connection to a soil cultivation tool, in particular a drilling tool, attached to the lower end of the inner kelly rod is made possible.

Furthermore, according to one embodiment variant of the invention, it is preferred that a cable is provided as a line on the inner kelly rod, which cable is designed to conduct electricity and/or data. The cable can be routed as an additional line along the axial cavity of the inner Kelly rod. When conducting power or data, the rotary feedthrough is designed alone or additionally with corresponding contact rings on the two connection sections, which ensure frictional contact for power or data transmission during a rotary movement.

The invention also includes a drilling device, in particular an earth drilling device, with a drilling drive, the Kelly bar arrangement according to the invention described above being provided. The drill drive is preferably designed in the form of a ring with a passage through which the outer Kelly bar of the Kelly bar arrangement is guided. The ring-shaped rotary drive has a ring-shaped drive wheel, which is provided with drive projections on its inside. For torque transmission, these interact in a known manner with axial drive rails on the outside of the outer kelly rod.

Basically, in a simple embodiment of the Kelly bar arrangement, only one outer Kelly bar and one inner Kelly bar can be provided. However, one or more intermediate kelly rod elements can also be arranged between the outer kelly rod and the inner kelly rod, with the corresponding maximum telescoping length of the kelly rod arrangement increasing accordingly.

It is particularly preferred according to the invention that a controller is provided for the rotary device and that a rotary sensor is provided for determining a speed and/or a direction of rotation of at least the inner Kelly rod, which is in signal communication with the controller. The rotary device and thus the drive motor can always be controlled by the controller in such a way that the upper second connection section of the rotary feedthrough is as fixed as possible relative to the rotating inner Kelly rod.

According to a development of the invention, it is particularly preferred that the rotary device is driven in a controlled manner by the control device, so that the second connection section of the rotary feedthrough is driven and synchronized in the opposite direction to a rotary movement of the inner Kelly rod. Exact compensation of the rotary movement of the inner kelly rod takes place, so that the opposite rotary movement by the rotary device achieves a desired standstill of the second connection section with the feed line, which in principle can also be a fluid line and/or a cable.

The method for soil cultivation according to the invention, which can be carried out in particular with the drilling device described above, is characterized in that a rotary device is provided for actively rotating the second connection section relative to the first connection section, with the second connection section being operated in the opposite direction to a rotary movement of the inner kelly rod.

With the method, a complete or extensive standstill of the second connection section, to which the upper feed line is attached, can be achieved relative to the rotating first connection section on the inner kelly rod, without the need for complex mechanical supports or the risk of the support cable twisting or the supply line is wrapped around the suspension cable.

The method is carried out with the Kelly bar arrangement according to the invention described above.

A particularly precise coordination of the rotary movement can be achieved according to a further development of the invention in that the rotary device depends on the speed of the inner Kelly rod or the drill drive is operated. A speed setting of the drill drive can be used directly as a specification for the rotating device. Alternatively, the speed of the inner Kelly rod or the drill drive can be detected by a rotary pick-up and used to control the rotary device.

Fig. 1

eine Seitenansicht eines Bohrgerätes mit einer erfindungsgemäßen Kellystangenanordnung;

Fig. 2

eine erfindungsgemäße Kellystangenanordnung in einem teilweise ausgefahrenen Zustand;

Fig. 3

die Kellystangenanordnung von Fig. 2 in einem eingefahrenen Zustand, und

Fig. 4

eine vergrößerte Teilquerschnittsdarstellung eines oberen Bereiches der erfindungsgemäßen Kellystangenanordnung.

The invention is further described below with reference to a preferred exemplary embodiment, which is illustrated schematically in the drawings. In the drawings show:

1

a side view of a drill with a Kelly bar assembly according to the invention;

2

a Kelly bar assembly according to the invention in a partially extended condition;

3

the kelly bar arrangement of 2 in a retracted state, and

4

an enlarged partial cross-sectional view of an upper portion of the Kelly bar assembly according to the invention.

A drill 10 according to FIG 1 includes a crawler chassis as an undercarriage 12, on which a superstructure 14 is rotatably mounted. A substantially vertical mast 20 is pivoted on the superstructure 14 and can be adjusted with regard to a mast inclination by means of an adjusting arrangement 18 with hydraulic cylinders. Attached to an upper end of the mast 20 is a mast head 22 over which a carrying cable 30 is guided to a winch 16 on the superstructure 14 .

A Kelly bar arrangement 40 according to the invention is suspended from the supporting cable 30 by means of a cable suspension 60 . The Kelly bar arrangement 40 is guided in a basically known manner through an annular drill drive 24 , which is also referred to as a top drive and is mounted on a carriage 25 so that it can be moved vertically along a guide on a front side of the mast 20 . Attached to a lower end of the Kelly bar arrangement 40 is a tillage tool 26 which, in the exemplary embodiment shown, is designed as a drilling bucket with lower removal teeth. About the winch 16 and the suspension cable 30 can in principle in a known manner, the Kelly bar arrangement 40 can be moved in the vertical direction relative to the drill drive 24 .

The Kelly bar arrangement 40 according to the invention enables a soil cultivation tool 26 to be suspended from a cable while at the same time enabling torque to be transmitted from the drill drive 24 to the soil cultivation tool 26.

The structure of the Kelly bar assembly 40 according to the invention is explained in more detail in connection with the Figures 2 to 4 explained. The representation of 3 is rotated by 90° to the representations of the figures 2 and 4 .

In the illustrated embodiment, the kelly bar assembly 40 includes an outer kelly bar 42 with outer drive bars 46, an inner kelly bar 50 with outer drive bars 53, and an intermediate kelly bar 48 with outer drive bars 49 therebetween. The outer kelly rod 42, the intermediate kelly rod 48 and the inner kelly rod 50 are each axially displaceable with respect to one another, with the torque being transferred in a basically known manner from the outer kelly rod 42 to the intermediate kelly rod 48 and from this to the inner kelly rod 50 independently of the respective axial adjustment position can be transmitted. Furthermore, locking pockets can be provided on the individual rod elements, so that axial forces can also be transmitted to a certain extent via the Kelly rod arrangement 40 in a locked state.

A sleeve-shaped support section 44 with a radial support surface is provided in an upper region of the outer Kelly bar 42 , with which the outer Kelly bar 42 and thus the Kelly bar arrangement 40 as a whole can be placed on the drill drive 24 .

The Kelly bar arrangement 40 as a whole is suspended from the supporting cable 30 via the inner Kelly bar 50 via a cable suspension 60 .

An annular support plate 57 is arranged on its lower end area 54, on which the outer kelly rod 42 and the intermediate kelly rod 48 in the retracted state according to 3 are put on. Furthermore, at the lower end area is 54 the inner Kelly rod 50 is provided with a connecting device 58 for the detachable attachment of the tillage tool 26 . In the illustrated embodiment, this is a square section with a transverse bore for receiving a locking bolt. Furthermore, a damping device 56 can be provided at the lower end region 54 of the inner kelly rod 50, as is shown in FIGS figures 2 and 3 is shown. The damping device 56 can serve to dampen axial impacts when telescoping the Kelly bar arrangement 40 in and out or when placing the tillage tool 26 on the ground.

At its upper end area 52 the inner kelly bar 50 and thus the kelly bar arrangement 40 as a whole is suspended from the carrying cable 30 by means of the cable suspension 60 . In the illustrated embodiment, as in particular 4 it can be seen that the carrying cable 30 is provided with a cable eye 63 which is connected to an upper articulation area 62 of the cable suspension 60 via a transverse retaining bolt 61 . A lower articulation area 64 of the cable suspension 60 is connected to the inner kelly rod 50 via a connecting bolt 67 and a connecting piece 65 . A rotary joint for forming a cable swivel 66 is arranged between the upper articulation area 62 and the lower articulation area 64 of the cable suspension 60 . The rotary joint permits rotation about the cable longitudinal axis between the upper articulation area 62 and the lower articulation area 64 in order to prevent twisting of the carrying cable 30 when the drill rod arrangement 40 is driven in rotation.

A rotary feedthrough 70 with a lower first connection section 72 and an upper second connection section 74 is arranged in a highly schematic manner on the upper end region 54 of the inner Kelly rod 50 . The inner Kelly bar 50 is non-rotatably connected to the lower first connection section 72, while the upper second connection section 74 is fixedly connected to the connecting piece 65 and the cable suspension 60. The first connection section 72 and the second connection section 74 of the rotary feedthrough 70 are rotatably mounted relative to one another and form a line connection.

In this case, an upper feed line 36 is provided in a highly schematic manner, which is fed in particular from the drilling device 10 and in particular the superstructure 14 from above the Kelly bar arrangement 40 . The rotary union 70 forms a line connection to a line 55 on the inner kelly rod 50. The line 55 is designed as a fluid line in the cavity 51 of the tubular inner kelly rod 50 in the illustrated embodiment. The supply line 36 can also supply a fluid and, as indicated in the exemplary embodiment shown, can also form a power supply for a rotary device 80 according to the invention with a drive motor 82 . In this case, the drive motor 82 is arranged on the upper second connection section 74 of the rotary feedthrough 70 and can rotate this relative to the lower first connection section 72 . A gear arrangement can be provided for this purpose.

The rotary feedthrough 70 according to the invention with rotary device 80 makes it possible to ensure that the upper second connecting section 74 with the feed line 36 is stationary even without a fixed support for the upper second connecting section 74, in particular by driving the drive motor 82 in the opposite direction, even if the inner kelly rod 50 is connected to the lower first connection section 72 of the rotary feedthrough 70 is driven in rotation.

The Kelly bar arrangement 40 according to the invention with the rotary device 80 thus ensures reliable functioning of the rotary feedthrough 70, even when the Kelly rod arrangement 40 is fully extended and the cable suspension 60 with the rotary feedthrough 70 and the rotary device 80 is located at a lower region of the intermediate Kelly rod 48.

Claims (13)

1. Kelly bar arrangement for a drilling apparatus (10), in particular an earth drilling apparatus, with a tubular outer Kelly bar (42), which is designed for bearing on a drill drive (24) and for receiving a drilling torque of the drill drive (24), and

   with an inner Kelly bar (50), which is displaceably supported inside the outer Kelly bar (42) and has a rope suspension (60), wherein the drilling torque can be transmitted between the outer Kelly bar (42) and the inner Kelly bar (50), characterized in that

   on the inner Kelly bar (50) at least one line (55) is arranged,

   in that in a lower or upper end region (52) of the inner Kelly bar (50) a rotary feedthrough (70) with a first attachment section (72) and a second attachment section (74) is arranged, wherein the first attachment section (72) is connected in a torque-proof manner to the rotationally drivable inner Kelly bar (50) and forms a line connection to the at least one line (55) of the inner Kelly bar (50) and the second attachment section (74) is connected to a supply line (36) which is stationary relative to the rotationally drivable inner Kelly bar (50), and

   in that on the rotary feedthrough (70) a rotary means (80) is arranged for actively rotating the two attachment sections (72,74) relative to each other.
2. Kelly bar arrangement according to claim 1,
   characterized in that
   the rotary feedthrough (70) is arranged on the inner Kelly bar (50) below the rope suspension (60).
3. Kelly bar arrangement according to any one of claims 1 or 2,
   characterized in that
   the rotary means (80) has at least a drive motor (82) for actively rotating the second attachment section (74) relative to the first attachment section (72).
4. Kelly bar arrangement according to claim 3,
   characterized in that
   the drive motor (82) is arranged on the second attachment section (74) which lies above the first attachment section (72).
5. Kelly bar arrangement according to claim 3 or 4,
   characterized in that
   the drive motor (82) is an electric motor or a hydraulic motor.
6. Kelly bar arrangement according to any one of claims 1 to 5,
   characterized in that
   the rope suspension (60) has a rope swivel (66).
7. Kelly bar arrangement according to any one of claims 1 to 6,
   characterized in that
   as a line (55) an axial hollow space (51) of the inner Kelly bar (50) is provided which is designed for passing a fluid through.
8. Kelly bar arrangement according to any one of claims 1 to 7,
   characterized in that
   as a line (55) on the inner Kelly bar (50) a cable is provided which is designed for conducting electricity and/or data.
9. Drilling apparatus, in particular earth drilling apparatus, with a drill drive (24),
   characterized in that
   a Kelly bar arrangement (40) according to any one of claims 1 to 8 is arranged.
10. Drilling apparatus according to claim 9,
    characterized in that

    a control is provided for the rotary means (80) and

    in that a rotation detector is provided for determining a rotational speed and/or a direction of rotation at least of the inner Kelly bar (50), which is in signal connection with the control.
11. Drilling apparatus according to claim 9 or 10,
    characterized in that
    the rotary means (80) is driven in a controlled manner by the control means such that the second attachment section (74) of the rotary feedthrough (70) is driven and synchronized in a diametrically opposed manner to a rotating motion of the inner Kelly bar (50).
12. Method for working the ground with a drilling apparatus (10) according to any one of claims 9 to 11, in which a Kelly bar arrangement (40) is set into rotating motion by means of a drill drive (24), wherein on an inner Kelly bar (50) of the Kelly bar arrangement (40) a ground working tool (26) is mounted which works a ground,
    characterized in that
    a rotary means (80) is provided for actively rotating the second attachment section (74) relative to the first attachment section (72), wherein the second attachment section (74) is operated in a diametrically opposed manner to a rotating motion of the inner Kelly bar (50).
13. Method according to claim 12,
    characterized in that
    the rotary means (80) is operated depending on a rotational speed of the inner Kelly bar (50) or the drill drive (24).

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