HK1154921B - Drilling device and drilling method - Google Patents

Description

Drilling apparatus and method of drilling

Technical Field

The invention relates to a drilling rig with a drilling device for drilling in a drill pipe (casing tube), which drilling device has a support frame with a fastening device for fixing relative to the drill pipe and a drilling tool which is driven in a rotating manner by means of a drilling drive arranged on the support frame via a telescopic rod.

The invention also relates to a drilling method for producing a borehole in a drill pipe, wherein a support frame of a drilling device is fixed relative to the drill pipe and a drilling tool is driven in a rotating manner by means of a drilling drive arranged on the support frame via a telescopic rod, whereby soil material is removed inside the drill pipe.

Background

A drilling apparatus and a drilling method of this type are known from EP1154078B 1. In order to produce a drilled pile in soft ground formations, the drill pipe is first pushed or screwed in by means of known guide devices. In order to remove soil material from the interior of the drill pipe, the hoisting device is intended to be placed on a drilling rig with a support frame which is clamped to the upper end of the drill pipe. A drilling bucket (drilingbucket) serving as a drilling tool is lowered through a telescopic Kelly rod (Kelly rod) using the hoisting device. The drilling tool of the drilling device is driven in rotation by a drilling drive provided on the clamped support frame via the kelly bar.

As soon as the receiving space of the drilling bucket is filled with removed soil material, the drilling tool is lifted again by the hoisting device, the support frame is separated from the drill pipe and the entire drilling device is swung sideways relative to the drill pipe, and the drilling bucket is emptied at this location. In order to continue drilling after the drilling device is again placed on the drill pipe, the support frame is clamped thereto and the drilling tool is lowered again.

After the borehole is formed, the drilling tool is removed in its entirety using a hoisting device and the cavity created in the borehole is filled, for example by inserting a reinforcement cage made of steel and bulk concrete, in order to create a foundation pile.

In summary, this known drilling method is very efficient, since after drilling has been completed the drilling device can be moved by the hoisting device to the next drill pipe so that the next borehole can be started thereupon. Due to the fact that the drilling rig is suspended by a cable from the hoisting device, a so-called "flying drilling rig" is formed which can be moved by the hoisting device in a fast and efficient manner, in particular over complex terrains.

The placement of the drilling rig on the drill pipe and the clamping of the support frame in the event of adverse weather conditions, particularly in the event of strong winds, requires an experienced and skilled operator in the hoisting apparatus. Time delays may occur during the working process due to the swinging motion of the drilling device suspended on the hoisting cable.

Disclosure of Invention

The present invention is based on the object of providing a drilling apparatus and a drilling method that enable efficient production of a borehole in a drill pipe even in adverse weather conditions.

This object is achieved according to the invention by a drilling apparatus having the features of claim 1 and a method of drilling having the features of claim 8, respectively. Preferred embodiments of the invention are set out in the respective dependent claims.

The drilling apparatus according to the invention is characterized in that an adjustable receiving part is provided at the upper end of the drill pipe, to which the support frame can be fastened, and which receiving part is adjustably supported between a drilling position, in which the drilling device is located in the receiving part on the same axis relative to the drill pipe, and an offset position, in which the receiving part is offset laterally relative to the drill pipe.

The basic idea of the invention lies in the fact that: during the production of a borehole, for example, in order to empty a drilling tool, or when performing measurement operations or maintenance operations, the drilling apparatus is no longer completely separated from the drill pipe. Instead, the drilling device remains connected to the drill pipe and is adjusted thereon in a defined manner. According to the invention, the drilling device is no longer clamped directly to the drill pipe, but to a receiving part provided thereon, which is supported in an adjustable manner on the drill pipe. Hereby, for example in case of strong winds, a quick and reliable adjustment of the receiving part, on which the drilling device is located, between the drilling position and an offset position, for example of a emptiable drilling tool, can be achieved. Preferably, the offset position is set by: it also provides free access to the upper opening of the drill pipe so that, for example, measurement operations or other work operations can be performed within the borehole.

As a result, the working process is generally facilitated, allowing a quick and reliable emptying of the drilling tool even in case of strong wind conditions. The drilling rig according to the invention can thus also be used, for example, in offshore areas to produce foundation piles on the seabed. The strong sea winds and the swinging movement of the lifting device arranged on the water vehicle hardly have any influence on the working process.

Basically, the adjustment of the receiving part can take place by a corresponding movement of a hoisting device from which the drilling device is suspended. In this case the receiving part will have been guided in a passive manner with respect to the drill pipe. However, according to the invention, it is particularly preferred to provide an adjustment device of the belt drive, with which the accommodating part can be adjusted between the drilling position and the offset position. The drive means of the adjustment device may be arranged on a platform on the drill pipe or on the drilling device, for example on a support frame. The adjustment movement may take place along a guide.

Basically, for the adjustment, a pivot joint may be provided, so that the receiving part can be pivoted with respect to the drill pipe by a rotational movement. A particularly simple and reliable arrangement is achieved according to the invention in that the adjusting device has a carriage which is guided along the displacement path. For this purpose, the displacement path can have one or two guide rails for the linear sliding movement. However, other types of adjustment movement may be provided.

Basically, various types of drilling tools can be used on the drilling apparatus. A discontinuously operating drilling tool, comprising a helical drill bit that screws itself into the soil, is particularly advantageous according to the invention. For working operations in soft soil types or under water, it is advantageous according to the invention if the drilling tool is designed as a drilling bucket with a bottom which can be opened by means of a hinge in order to empty the drilling bucket.

A further improvement according to the invention resides in the fact that an actuating mechanism is provided, which is designed for opening the bottom of the drilling bucket by means of a hinge when the drilling bucket is set in the offset position. In a known manner, the hinged bottom first has an opening with a cutting device so that soil material can be removed and conveyed through the opening to the cylindrical receiving space of the drilling bucket. In a particular embodiment, a screw device may be provided as an additional conveying device within the drilling bucket. When the receiving space is filled, the opening is closed by a twisting movement of the bottom, and the drill bucket with the removed soil material is withdrawn from the drill pipe into the receiving part. Thereafter, the drilling bucket together with the receiving part can be moved into the offset position for emptying. The bottom locking device can be opened by means of an actuating mechanism which can be actuated, for example, by the hoisting device by a short lifting movement of the drilling device. In this way, the bottom part can be opened about the pivot joint hinge so that the soil material can fall out of the receiving space of the drilling bucket due to gravity.

Another preferred embodiment of the invention arises from the fact that: during adjustment of the receiving part from the offset position into the drilling position, the hinged open bottom of the drilling bucket can be closed. The use of wedge-shaped or ramp-shaped positioning elements makes it possible, for example, to push the hinged open bottom back into its closed position during an adjusting movement back into the drilling position, the locking means of the bottom being locked again. Once the drilling tool with the receiving part is again in the drilling position, the drilling tool can be lowered into the drill pipe by means of the telescopic rod in order to continue the drilling process.

According to the invention, a platform is preferably provided at the upper end of the drill pipe, on which platform the receiving part and the adjusting device are arranged. The platform with the receiving part is detachably connected to the drill pipe by means of suitable fastening means. After the drilling operation is completed, the platform may then be separated from the drill pipe and placed on a new drill pipe that has been jacked into the soil. To this end, the platform may be provided with suitable connection means for cable suspension.

With regard to the drilling method, the invention is characterized in that the support frame of the drilling device is fastened to a receiving part provided at the upper end of the drill pipe and by means of the receiving part the drilling device is adjusted between a drilling position, in which the drilling device is located in the receiving part on the same axis relative to the drill pipe, and an offset position, in which the receiving part is offset laterally relative to the drill pipe.

As described above, due to the accommodating member according to the present invention, acceleration and simplification of the working process are achieved.

According to the invention, the preferred procedure consists in the fact that the drilling tool of the drilling device is emptied of the removed soil material at the offset position. In this way, a discontinuous method can be performed, which is particularly advantageous in the case of soft soils.

According to the invention, the drilling device is intended to be held in both a drilling position and an offset position by means of a telescopic rod on the hoisting device. In particular, the hoisting device may be a spreader or a crane commonly used in construction sites, on which hoisting cables the drilling device is suspended. In particular, the telescopic rod may be a so-called kelly bar which is directly actuated by a hoisting cable for adjusting the drilling tool. The drilling method according to the invention is particularly suitable to be carried out with a hoisting device on a vessel or on a different type of water vehicle which is exposed to particularly strong oscillations, for example due to the motion of waves.

Furthermore, according to the invention, a drill pipe is provided, which is introduced, in particular, jacked into the soil. For this purpose, known propulsion devices can be used. Further, according to the invention, after the drill hole is produced in the drill pipe, a large block of concrete is filled therein and a drilled pile is formed.

For carrying out the drilling method, use may in particular be made of a drilling device known from EP1154078B1, for example as described above.

Drawings

The invention will be further described by means of preferred embodiments schematically illustrated in the drawings, in which:

figure 1 shows a schematic view of the apparatus and method according to the invention in different stages during production drilling;

figure 2 shows a schematic side view during adjustment of the drilling apparatus from the drilling position to the offset position;

figure 3 shows a schematic side view of the drilling apparatus in an offset position; and

fig. 4 shows a schematic partial cross-sectional view of a drilling device according to the invention.

Detailed Description

In fig. 1a, an initial stage in the process of implementing the drilling method according to the invention is shown. First, a drill pipe 5, which is only partially shown, is introduced into the softer soil 2, which soil 2 in the embodiment shown is located below the body of water 3, in a manner known per se using a guide device. The drill pipe 5 projects upwards and beyond the surface of the body of water 3 so that the receiving member 20 can be attached to the upper region of the drill pipe 5 in a rotationally fixed manner. In the embodiment shown, the platform 30 is additionally fastened in a detachable manner in the upper region of the drill pipe 5.

As part of the drilling rig 10 according to the invention, the drilling device 100 is lowered in the direction of the receiving part 20 by means of a telescopic rod 130 held by a hoisting cable 62 on the hoisting device 60. In this example, the lifting device 60 comprises a track-supported vehicle with a cradle arranged on the buoy 7.

As shown in fig. 1b, the drilling device 100 is lowered to the substantially tubular receiving member 20 and fastened to the upper side of said receiving member 20. In the position according to fig. 1b, the receiving part 20 with the drilling device 100 and the telescopic rod 130 received therein is located on the same axis with respect to the central axis of the drill pipe 5. In this drilling position, the drilling tool 140 of the drilling device 100 can then be moved into the drill pipe 5 and drill out the soil material located therein by extension of the telescopic rod 130.

Fig. 1c shows the possible final depth to which the telescopic rod 130, which can be extended in three sections, can be extended.

Basically, the drill pipe 5 may extend to the lower end of the borehole, i.e. all the way to the bottom of the borehole. In this case, a full wrap (cased) borehole will be formed. Alternatively, the drill pipe 5 may be provided only in the upper region of the borehole where softer soil material is present. If a more stable layer of soil is below, no further casing installation is required so that the borehole can also be lowered below the drill pipe 5.

As can be seen from fig. 2, in the drilling apparatus 10 according to the invention, the drilling tool 140 is designed as a drilling bucket with a cylindrical receiving bucket 146 for performing a discontinuous drilling method.

By means of a corresponding rotational movement of the drilling tool 140, which drilling tool 140 is driven in a rotational manner by means of the drilling drive 116 through the telescopic rod 130, soil material is removed in the drill pipe 5 and conveyed through the opening in the bottom into the receiving pocket 146. When the receiving bucket is filled, the drilling tool 140 is then moved out of the drill pipe 5 back to the receiving part 20 via the telescopic rod 130 and the hoisting cable 62 after the opening in the bottom of the drilling tool 140 has been closed by a short counter-rotation. Thereafter, the accommodating member 20 with the drilling tool 100 is moved to the offset position by the adjusting device 40. For this purpose, the adjustment device 40 has a displacement path 44 with a track arranged transversely to the drill pipe 5 along the platform 30. The carriage 40 is located on the underside of the sleeve-shaped receiving part 20, which can be moved along a displacement path 44 by means of a drive device, not shown.

As shown in fig. 2, a platform 30 is disposed in a generally horizontal manner above the body of water 3 and is detachably secured by a support structure 32, and a collar (collar)34 is retained at the upper end of the drill pipe 5.

After reaching the offset position shown in fig. 3, the bottom 142, which is hinged by means of the hinge joint 144 to the underside of the receiving bucket 146, can be opened by means of the actuating mechanism 50. Bottom 142 may be hinged open to the vertical position shown so that soil material located inside bucket 146 may fall. Thereafter, the receiving part 20 with the drilling device 100 is moved back to the drilling position to the right again towards the drill pipe 5. In this way, the bottom 142 is pushed back into the horizontal closed position on the receiving bucket 146, wherein the bottom 142 is locked by a locking device, not shown here. Thereafter, a new drilling step may be performed until the receiving bucket 146 is again filled and must be moved again to the offset position in order to be emptied.

In fig. 4 it is schematically shown that the drilling device 100 is preferably fastened to the receiving part 20. The drilling apparatus 100 has a support frame 110 provided with a cross member 117 at its lower end. On one side of the lower side of the cross member 117, a seating bracket 111 is provided, and the drilling apparatus 100 can be seated on the upper edge of the sleeve-shaped receiving part 20 using the seating bracket 111. One or more fastening devices 114 are provided, located offset from the mounting bracket 111, with hydraulically operated collets. Using these clips, the support frame 110 can be fastened to the receiving part 20 in a rotationally fixed manner.

Furthermore, a drilling drive 116 for driving a drilling tool 140 in a rotary manner via a telescopic rod 130 is also provided on the support frame 110.

In the embodiment shown, the support frame 110 is of two-part design with a lower support frame part 115 and an upper support frame part 113 arranged above. The drilling drive 116 is arranged in a fixed manner on the upper support frame part 113, which upper support frame part 113 is axially adjustable relative to the lower support frame part 115 by means of a hydraulic cylinder with a hydraulic cylinder piston 112 a.

By disengaging the fastening device 114, the drilling apparatus 100 can be pulled up out of the receiving part 20 and then placed on a receiving part on another drill pipe to create another borehole.

Claims (9)

1. A drilling rig with a drilling device for drilling in a drill pipe, the drilling device having a support frame with a fastening device for fixing relative to the drill pipe, and a drilling tool which is driven in a rotating manner by means of a telescopic rod by means of a drilling drive arranged on the support frame, wherein,

an adjustable receiving part is provided at the upper end of the drill pipe, on which receiving part the support frame of the drilling device can be fastened, and

the receiving member is adjustably supported between a drilling position in which the drilling apparatus is located in the receiving member on the same axis relative to the drill pipe and an offset position in which the receiving member is laterally offset relative to the drill pipe,

an adjustment device with a drive is provided, with which the receiving part can be adjusted between the drilling position and the offset position,

a platform is provided at the upper end of the drill pipe, on which platform the receiving part and the adjusting device are provided.

2. The drilling apparatus according to claim 1,

it is characterized in that the preparation method is characterized in that,

the adjusting device has a carriage guided along a displacement path.

3. The drilling apparatus according to claim 1,

it is characterized in that the preparation method is characterized in that,

the drilling tool is designed as a bucket with a bottom that can be opened by means of a hinge in order to empty the bucket.

4. A drilling device according to claim 3,

it is characterized in that the preparation method is characterized in that,

an actuating mechanism is provided which is designed to hinge open the bottom of the drilling bucket when the drilling bucket is set in the offset position.

5. A drilling device according to claim 3,

it is characterized in that the preparation method is characterized in that,

during adjustment of the receiving part from the offset position to the drilling position, the hinged open bottom of the drilling bucket can be closed.

6. Drilling method for producing a borehole in a drill pipe by means of a drilling apparatus according to claim 1, wherein a drilling device comprises a support frame and a drilling tool is driven in a rotating manner by means of a drilling drive arranged on the support frame via a telescopic rod for removing soil material in the drill pipe,

it is characterized in that the preparation method is characterized in that,

fastening the support frame of the drilling device on a receiving part provided at the upper end of the drill pipe, and

by means of the receiving part, the drilling device is adjusted between a drilling position, in which the drilling device is located in the receiving part on the same axis relative to the drill pipe, and an offset position, in which the receiving part is offset laterally relative to the drill pipe.

7. The method of drilling according to claim 6,

it is characterized in that

Emptying the drilling tool of the drilling apparatus of removed soil material at the offset location.

8. The method of drilling according to claim 6,

it is characterized in that

The drilling device is held in the drilling position and the offset position by a telescopic rod on a hoisting device.

9. The method of drilling according to claim 6,

it is characterized in that

Introducing the drill pipe into the soil, and

bulk concrete is then filled into the resulting borehole in the drill pipe and forms a drilled pile.