EP2703596A1 - Drilling device and method for producing a borehole - Google Patents

Abstract

The device (10) has a housing (12) inserted and torque-proof fixed to a support tube, and a cutting unit (56) removing a base material. A receiving container (44) is arranged above the cutting device, and threaded base material with a flushing liquid is conveyed into the receiving container. A stirring element is provided in the receiving container for mixing the threaded base material with the flushing liquid. Discharging equipment removes the threaded base material with flushing liquid in upward direction from the receiving container. Independent claims are also included for the following: (1) a drilling system (2) a method for creating a hole in a base by a drilling device.

Description

The invention relates to a drilling device for creating a bore within a support tube in the ground according to the preamble of claim 1 and a method for creating a bore in the ground according to the preamble of claim 11.

The drilling apparatus comprises a housing which can be inserted into the support tube and fixed in a rotationally fixed manner on the support tube, a cutting device for removing soil material, a rotary drive for rotationally driving the cutting device and a feed device with which a rinsing liquid can be fed into a region of the cutting device.

In the method, a support tube is introduced into the ground, a drilling device inserted into the support tube and fixed to the support tube rotationally fixed, removed soil material by means of a rotating driven cutting device of the drilling device and fed a rinsing liquid in a region of the cutting device.

An apparatus and a method for creating a borehole within or below a support tube are in US 4,202,416 described. The drilling device is inserted into the support tube and fixed in this rotation. By means of a rotary driven cutting device soil is removed and collects at a provided above the cutter screw conveyor. If the auger. When the auger is filled, the entire device is pulled out of the support tube and the auger emptied. Thereafter, the drilling process can be continued. The process is therefore a batch process.

Drilling arrangements with a drill device which can be fixed in a support tube are suitable in particular for creating boreholes under water, in particular in the offshore area. For example, such devices and methods for anchoring of supporting structures in the seabed, such as a wind turbine can be used. The drilling device can be introduced from a floating pontoon in the support tube. By means of the drilling device, the interior of the support tube and optionally an underlying area can be drilled out. The drilling device is supported on the support tube.

The invention has for its object to provide an apparatus and a method for creating a bore within a support tube, which allow a particularly economic hole creation.

The object is achieved by a drilling device with the features of claim 1 and a method having the features of claim 11. Preferred embodiments of the invention are specified in the dependent claims.

The drilling apparatus is according to the invention characterized in that above the cutting device, a receptacle is arranged, in which ablated soil material is conveyed with the rinsing liquid, that in the receptacle at least one stirring element for stirring the removed soil material is provided with the rinsing liquid and that a discharge device is provided, with which the removed soil material can be discharged upwards together with the rinsing liquid from the receiving container.

The method according to the invention is characterized in that abraded soil material is conveyed into a receptacle of the drilling device above the cutting device, that in the receiving container the removed soil material is stirred with rinsing liquid and that the removed soil material is removed together with the rinsing liquid from the receptacle upwards.

A basic idea of the invention can be seen in providing a drilling apparatus and a corresponding drilling method, which provide a continuous borehole setting allow inside and / or below a support tube. According to the invention for this purpose, according to a first aspect of the invention, a discharge device is provided, with which the removed soil material together with the rinsing liquid out of the borehole or the support tube out, in particular to the soil surface, can be promoted. For this purpose, the discharge device can in particular comprise a line and a pump.

In order that a mixture of removed soil material and rinsing liquid is conveyed as continuously as possible, a receiving container or agitating space is provided according to the invention, in which removed soil material is stirred or mixed with the rinsing liquid by means of at least one stirring element. By stirring or homogenizing, sedimentation of the solids content in the receptacle or stirring space is at least largely prevented. This allows efficient and reliable removal of the removed soil material via the rinsing liquid as a carrier medium. The receiving container with the stirring element can also be referred to as a stirring container.

For rotationally fixed fixing of the housing in the support tube, a clamping device is preferably provided, with which the housing can be clamped in the support tube. The drilling device can in particular be clamped or clamped to a tube inner wall of the support tube. For this purpose, the clamping device can have at least one clamping cylinder or punch which can be clamped against the inner wall of the support tube. Preferably, a plurality of clamping elements are distributed along the circumference of the drilling device.

To carry out the drilling process, the drilling device thus supported on the support tube. The drilling device can be lowered by means of a rope, for example by a crane, into the support tube.

The rotary drive arranged in the drill device which can be braced in the support tube preferably drives a shaft which runs centrally within the drilling device. The cutting device is arranged at the lower end of the shaft and driven in rotation about the shaft.

Between the cutting device and the at least one stirring element can be a conveyor, in particular a screw conveyor, for conveying the ablated Soil material can be arranged by the cutting device in the receptacle. The conveyor or screw conveyor may, in particular together with the cutting device, be driven in rotation. Preferably, the cutting device comprises at least one arranged at the lower end of the screw conveyor or conveyor spiral, extending substantially radially extending cutting edge.

For an efficient mixing of the cuttings and the rinsing liquid within the receptacle arranged in the receptacle stirring element is preferably driven in rotation. The at least one stirring element is preferably arranged on a guided through the stirring space, rotatably driven shaft. In principle, however, the rotationally driven stirring element can also be provided on an outer wall of the receiving container. Preferably, the receptacle has a cylindrical shape.

The drive of the stirring element can be provided particularly economically by virtue of the fact that the cutting device and the stirring element can be driven jointly by the rotary drive. Thus, a common rotary drive is provided for both the cutting device and the stirring elements. However, to enable different rotational speeds, a transmission gear can be provided. Cutting device and stirring element are preferably driven by a common shaft.

According to the invention, it is further preferred that a drilling head is provided, which can be braced in the support tube, and that a movable bottom part is provided with respect to the drilling head part, which comprises the cutting device and the receptacle. To create a hole within the support tube, the drilling head part is clamped in the support tube and pressed down the bottom of the drilling including cutter and receptacle. The receptacle with the stirring means is thus always at a defined distance from the cutting device. After a certain drilling progress, the tension of the drilling head part is released and the drilling head is traced to the drilling base. Then the drilling head part is clamped again in the support tube and carried out a further drilling step.

For moving the lower part of the drill opposite the upper part of the drill, a feed cylinder is preferably provided. The particular hydraulically operated feed cylinder pushes the bottom of the drill with drill head against the bottom hole.

Furthermore, it is preferred according to the invention that the feed device and / or the discharge device have a telescopic line. The telescoping line can be arranged in particular in the region between the drilling head and the drilling base, which are movable relative to each other. Alternatively, the supply and / or discharge line connected to the lower drilling part can also be mounted axially displaceable within the drilling head part.

A particularly efficient mixing of the cuttings with the rinsing liquid can be achieved in that in addition to the at least one driven stirring element at least one fixed mixing element is arranged in the receptacle, which cooperates with the stirring element. For example, a plurality of stirring elements may be arranged on an inner shaft and a plurality of mixing elements on an inner surface of an outer wall of the receptacle. Preferably, the driven stirring elements and the fixed mixing elements are arranged axially offset from one another and overlap in the radial direction, so that a flow induced by the stirring elements is fluidized by the mixing elements.

For comminuting removed soil material before it is introduced into the stirring space, a comminuting device can be arranged below the stirring space. The comminuting device can in particular form a constriction between the cutting device and the receptacle and have a conical guiding and breaking surface, arranged under the constriction, for guiding and breaking rock fragments. The conveyor screw of the conveyor may be mounted for conveying the soil material along the guide and refractive surface of this. The shredding device may be driven via the central shaft within the drilling device.

For the comminution of abraded soil material, an upwardly tapering between the cutting device and the bottleneck below the stirring space Be formed delivery room. In the tapered delivery chamber, a screw conveyor with an upwardly tapering cross section can be set up.

In a further aspect, the invention relates to a drilling rig with a support tube which can be introduced into the ground and a boring device according to the invention which can be arranged in the support tube. The support tube can preferably be introduced into the ground, for example, shake or screw in before the drilling device is inserted into the support tube. With the drilling device, soil material can be removed within and / or below the support tube, in which case the support tube can also be successively driven further into the ground.

With the method according to the invention, the advantages described with reference to the drilling device are achieved. In particular, the removed soil material can be reliably conveyed out of the borehole by the efficient mixing with the rinsing liquid, whereby a continuous borehole position over large borehole depths is possible.

Fig. 1

eine perspektivische Ansicht einer erfindungsgemäßen Bohrvorrichtung;

Fig. 2

eine Querschnittsansicht einer erfindungsgemäßen Bohrvorrichtung;

Fig. 3

eine Querschnittsansicht eines erfindungsgemäßen Aufnahmebehälters mit Schneid- und Fördereinrichtung; und

Fig. 4

eine perspektivische Ansicht eines erfindungsgemäßen Aufnahmebehälters mit Schneid- und Fördereinrichtung.

The invention will be further elucidated on the basis of preferred exemplary embodiments, which are illustrated in the appended schematic figures. It shows:

Fig. 1

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

Fig. 2

a cross-sectional view of a drilling device according to the invention;

Fig. 3

a cross-sectional view of a receptacle according to the invention with cutting and conveying device; and

Fig. 4

a perspective view of a receptacle according to the invention with cutting and conveying device.

Identical or equivalent elements are indicated in all figures with the same reference numerals.

A drilling device 10 according to the invention can be inserted into a support tube (not shown) and lowered into it. The support tube is usually first introduced into the ground and possibly anchored and can then be drilled out by means of the drilled down drilling device. The introduction of the support tube into the ground, for example the bottom of a body of water, can take place by means of a suitable and basically known insertion device, for example a piling device. The support tube then serves on the one hand to support the borehole to be created and on the other hand as an abutment and guide for the drilling device 10 fixed therein.

The drilling apparatus 10 comprises a housing 12 which can be fixed or clamped in the support tube at different locations for performing a drilling operation. The housing 12 may be designed as a frame structure and comprises a substantially cylindrical outer contour for insertion into the support tube.

In the housing 12, a shaft 32 is rotatably supported via pivot bearings 33. The shaft 32 is driven in rotation by means of a rotary drive 26 and drives a drill head with a cutting device 56.

The drilling device 10 comprises a drilling head 20 and a drilling base 40 mounted axially displaceably relative thereto. A clamping device 22 is provided on the drilling head 20 or on the housing 12 of the drilling device 10, by means of which the drilling head 20 or the housing 12 rotates in the support tube. and can be clamped axially fixed, is. The clamping device 22 may comprise hydraulically operated actuating cylinder, by means of which clamping elements can be pressed radially outwardly against an inner surface of the support tube.

At an upper end of the Bohroberteils 20, a cable suspension 24 is provided, by means of which the drilling device 10 can be inserted into the support tube and pulled out of this.

The drill lower part 40 is movable downwards relative to the drill bit part 20 by means of one or more feed cylinders 30, in particular hydraulic cylinders, so that the drill bottom part 40 can be pressed against the drill hole bottom when the drill bit part is braced in the support tube.

The lower drilling part 40 comprises in its lower region a cutting device 56 for removing or separating soil material. Above the cutting device 56, a receptacle 44 is arranged, in which a stirring chamber 45 is formed and in addition a conveyor 50 may be arranged. The conveying device 50 serves to convey removed soil material from the cutting device 56 into the stirring chamber 45. The stirring chamber 45 serves to mix the removed soil material with a rinsing liquid which is introduced into the borehole during the drilling process, preferably above the cutting device 56.

At its upper end facing the drilling head 20, the lower drilling part 40 may have a guide device 42, which is supported on the support tube and thus ensures reliable guidance of the lower drilling part 40 within the support tube.

In the particular cylindrical receptacle 44, an agitator is arranged in an upper region. In principle, the stirring device can be designed as a static mixer, but it is preferred in terms of an improved stirring performance that the stirring device comprises rotationally driven stirring elements 46. Below the mixing space 45, in a lower region of the receiving container 44, there is a conveying screw 52, by means of which removed soil material can be conveyed by the cutting device 56 into the stirring space 45.

The rotationally driven shaft 32, which drives the cutter 56 in rotation, extends centrally through the receptacle 44. The shaft 32 also drives the screw conveyor 52 at. The stirring members 46 are disposed on an outer periphery of the shaft 32 and are also rotated with the shaft 32.

On an outer, stationary container wall of the receptacle 44 are axially offset from the stirring elements 46 fixed recirculation or mixing elements 48 are arranged. Stirring elements 46 and mixing elements 48 overlap in the radial direction, so that a particularly efficient mixing within the stirring chamber 45 can take place. Stirring elements 46 and mixing elements 48 are designed paddle-shaped and can also be referred to as Rührpaddel or mixing paddles.

For supplying the rinsing liquid, which may be in particular water, a supply device 60 with a supply line 62 and a conveyor or feed pump 64 is provided. The feed line 62 extends in the illustrated embodiment eccentrically along the drilling device 10 and is telescopic. It opens in the region of the conveyor 50 above the cutting device 56 into the receptacle 44. An inlet opening 66 of the supply line 62 is arranged so that the rinsing liquid is introduced transversely to the drilling axis in the region of the conveyor 50. The introduction preferably takes place under pressure, so that premixing with the removed soil material already takes place in the conveying device 50. The feed pump 64, which is in particular a pressure pump, is arranged in the region of the drilling head part 20.

For discharging the cuttings and rinsing liquid existing suspension from the receptacle 44 and the stirring chamber 45 is a discharge device 70 with a discharge or suction line 72 and a discharge pump 74, in particular a suction pump, is provided. The suction line 72 extends in the illustrated embodiment centrally within the drilling device 10 within the rotationally driven shaft 32. A suction port 76 is provided on the shaft 32 and rotates together with this.

For driving the shaft 32, a ring-like rotary drive 26 is provided, through which the shaft 32 is passed. The rotary drive 26 is located on the drilling head part 20. The shaft 32 is designed to be telescopic and has at least two axially adjustable shaft elements, which are preferably coupled to each other for torque transmission by means of driver elements 34. The supply line 62 and extending within the shaft 32 discharge line 72 are also designed to be telescopic.

The cutter 56 includes one or more cutting bars having a plurality of bits. The cutter bar is attached to a lower end of a screw flight of the screw conveyor 52, respectively.

Below the mixing or stirring chamber 45, a stationary crushing or comminuting device 54 for breaking or crushing larger rocks is arranged. For this purpose, a constriction 53 is formed below the stirring chamber 45, through which the removed soil material is conveyed by means of the conveyor 50 into the stirring chamber 45. The constriction 53 has a passage cross section for the removed soil material, which is smaller than a cross section of the stirring chamber 45 and / or a removal cross section at the cutting device 56.

The crushing or comminution device 54 includes below the constriction 53 a conical guide surface 55, which conducts the removed soil material to the constriction 53 and optionally, in particular in cooperation with the screw conveyor 52, comminuted. The screw conveyor 52 extends for this purpose along the conical guide surface 55 and is preferably attached to the conical guide surface 55. As a result, an upwardly tapering delivery chamber is formed along the spiral conveying screw 52, in which larger pieces of material are comminuted or broken during conveyance in the direction of the mixing chamber 45. The crushing or shredding device 54, in particular the conical guide surface 55, is preferably formed of a hardened material and may also be referred to as a cone or cone crusher.

As shown in the figures, the crusher 54 may be secured to the rotary driven shaft 32 and thus rotationally driven by the shaft 32. The rotationally driven shaft 32 may extend in particular through the crushing or comminution device 54. Preferably, the screw conveyor 52 is disposed on an outer periphery of the cone-shaped crushing or crushing device 54. To support the comminution process, a guide device 58 with a further, in particular conical pressure or guide surface 59 is arranged on one of the crushing or comminution device 54 radially opposite outer side. The conical guide surface 59 is also shaped such that the free cross-section for the bottom material tapers upwards and preferably also formed from a hardened material.

The rinsing liquid is preferably added to the cuttings in the region of the conveyor 50 or the conveyor screw 52. The introduction opening 66, or optionally a plurality of inlet openings 66, for introducing the rinsing liquid are preferably in the region of the crushing or comminuting device 54, in particular in an outer region, which the crushing or comminuting device 54 or the conical guide surface 55 radially opposite, arranged.

Furthermore, an installation device for hydraulics and / or electrics is located on the drilling head part 20. The drilling device 10 is preferably connectable via hydraulic and electrical lines to corresponding supply units outside the support tube.

With the device according to the invention and the method according to the invention, soil can be excavated in a particularly efficient manner in a support tube anchored in the ground. The removed soil material is transported away by means of a conveyor coil from the cutter, mixed with a rinsing liquid and stirred in a stirred container by means of driven stirring elements to prevent sedimentation of the solids content and to keep the cuttings in limbo. The mixture of cuttings and liquid is sucked out of the stirring region by means of a suction pump. This results in a continuous removal of the soil material together with the introduced into the well irrigation, whereby a continuous soil excavation over large drilling depths is possible.

Claims (11)

Drilling device for creating a hole within a support tube in the ground with - A housing (12) which is insertable into the support tube and fixed rotatably on the support tube, a cutting device (56) for removing soil material, - A rotary drive (26) for rotationally driving the cutting device (56) and a feed device (60), with which a rinsing liquid can be fed into a region of the cutting device (56), characterized, in that above the cutting device (56) a receiving container (44) is arranged, in which removed soil material can be conveyed with the rinsing liquid, - That in the receptacle (44) at least one stirring element (46) is provided for stirring the abraded soil material with the rinsing liquid, and - That a discharge device (70) is provided, with which the removed soil material together with the rinsing liquid from the receptacle (44) can be discharged upwards. Drilling device according to claim 1,
characterized,
that a clamping device (22) is provided, with which the housing (12) can be clamped in the support tube. Drilling device according to claim 1 or 2,
characterized,
in that a conveying screw (52) is arranged between the cutting device (56) and the at least one stirring element (46). Drilling device according to one of claims 1 to 3,
characterized,
in that the at least one stirring element (46) arranged in the receptacle (44) can be driven in rotation. Drilling device according to claim 4,
characterized,
in that the cutting device (56) and the at least one stirring element (46) can be driven jointly by the rotary drive (26). Drilling device according to one of claims 1 to 5,
characterized,
that a drilling head (20) is provided, which is clamped in the support tube, and
in that a drilling base (40) which can be moved relative to the drilling head part (20) is provided, which comprises the cutting device (56) and the receptacle (44). Drilling device according to claim 6,
characterized,
that an adjusting cylinder (30) is provided, with which the drilling sub (40) with respect to the Bohroberteils (20) is movable. Drilling device according to one of claims 1 to 7,
characterized,
in that the feed device (60) and / or the discharge device (70) has a telescopic line (62, 72). Drilling device according to one of claims 1 to 8,
characterized,
in that in addition to the at least one driven stirring element (46), at least one fixed mixing element (48) is arranged in the receiving container (44), which cooperates with the stirring element (46). Drilling rig with a support tube which can be introduced into the ground and a boring device (10) which can be arranged in the support tube according to one of claims 1 to 9. Method for creating a bore in the ground, in particular by means of a drilling device (10) according to one of claims 1 to 10 and / or a drilling rig according to claim 11, in which a support tube is inserted into the ground, a drilling device (10) is inserted into the support tube and fixed in a rotationally fixed manner to the support tube, - Soil material is removed by means of a rotationally driven cutting device (56) of the drilling device (10) and a rinsing liquid is fed into a region of the cutting device (56), characterized, - that removed soil material is conveyed into a receptacle (44) of the drilling device (10) above the cutting device (56), - That in the receptacle (44) the removed soil material is stirred with rinsing liquid and - That the removed soil material is discharged together with the rinsing liquid from the receptacle (44) upwards.

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