WO2018162520A1

WO2018162520A1 - Drilling bucket

Info

Publication number: WO2018162520A1
Application number: PCT/EP2018/055535
Authority: WO
Inventors: Ralf Kister
Original assignee: Tbh Technisches Büro Hagen Gmbh
Priority date: 2017-03-09
Filing date: 2018-03-07
Publication date: 2018-09-13
Also published as: DE202017101358U1

Abstract

The invention relates to a drilling bucket for fastening to the drill pipes of a drilling tool, comprising a base which has a closable filling opening and is provided with a cutting device, wherein the drilling bucket comprises a bin (3), which is movable inside a cylinder (1), at least one outflow opening (33) being introduced into the bin casing (30) and closed by the cylinder casing (1) in an inserted position of the bin (3), wherein closure means are arranged for releasable fixing of the bin (3) in the inserted position.

Description

Drilling buckets

The invention relates to a drilling bucket for attachment to the drill string of a drilling rig according to the preamble of patent claim 1.

So-called drilling buckets are used to convey cuttings in cased boreholes. Such a drilling bucket is for example in the

DE 1 936 010 U described. In this case, a sector-like filling opening is provided in the bottom of the bucket, which can be closed by a sector-shaped rotary valve. Adjacent to the opening, a cutter for loosening the soil is attached to the drill bottom. By rotation of the drilling bucket by means of the cutting edge, a removal of the soil, which is introduced via the opening arranged in the bottom of the drilling bucket. Rotation of the bucket in the opposite direction causes rotation of the rotary valve, thereby closing the opening. To empty the bucket, the bottom is hinged down to the bucket. In particular, in drilling in groundwater, when drilling with Wasserauflast and suspension-supported holes is worked with such drilling buckets.

A disadvantage of the known drilling buckets that they have in particular due to the folding mechanism of the soil only inadequate tightness. As a result, even with new drilling buckets, a large part of the conveyed fine particles is rinsed out with the conveyed water and the degree of filling steadily decreases until the drilling bucket is emptied. Volume and delivery are here in no economic relationship.

Here invention wants to remedy the situation. The invention has for its object to provide a drilling bucket, which is particularly designed with regard to the requirements of drilling in groundwater and Wasserauflast and in particular has a high density. According to the invention, this object is solved by the features of the characterizing part of patent claim 1. , ,

With the invention, a drilling bucket is provided, which is particularly designed with regard to the requirements of drilling in groundwater and at Wasserauflast and in particular has a high density. Due to the fact that the drilling bucket comprises a pot which can be displaced within a cylinder, in the pot jacket of which at least one outflow opening is closed, which is closed by the cylinder jacket in an insertion position of the pot, closure means being arranged for releasably fixing the pot in the insertion position Tightness of the drill bucket achievable. In a further development of the invention, the pot is connected to the cylinder via a telescopic rod, which is fastened at one end to the bottom of the pot and at the other end to a cover plate which closes the end of the cylinder. As a result, a uniformly guided movement of the pot is ensured within the cylinder.

In a further embodiment of the invention, the telescopic rod is passed through a hole introduced into the bottom of the pot and the end connected to a hole projecting pilot cone, which is fixed to the bottom of the pot. As a result, a robust attachment of the pot is achieved on the cylinder. The bottom of the pot lies on the pilot cone projecting above the bore. In addition, a centering of the drilling bucket within the drilling process is effected by the pilot cone.

In a further development of the invention, the closure means are formed by at least one, preferably at least two attached to the telescopic rod, pivotable, end having an undercut latch formed by an associated arranged in the cover plate opening hindurchschiebbar such that they cover plate in the insertion position of the pot engage behind. As a result, an automatic locking of the pot in an insertion position can be achieved.

In an embodiment of the invention, the latch are biased by a spring in the closing direction, the Riege! preferably have a sliding bevel end, with which they pass through the opening of the cover plate at this - - slide along. As a result, a simple locking of the bolt is achieved after passing through the openings arranged in the cover plate.

In a further embodiment of the invention, at least one provided with an opening element spring telescopic rod is arranged on the cover plate, by the actuation of the at least one bolt against its bias is pivotable, whereby the closure means are entriegeibar. In this case, preferably at least two spring telescopic rods provided with an opening element are arranged for unlocking a respective bolt, which are connected to a stop plate in which they are guided. As a result, a simple unlocking of the drilling bucket by retracting the boring bar and striking the at least one Federteleskopstange on the pressure tube of a rotary drilling machine allows. In a further development of the invention at least two vertical guide slots are introduced into the pot jacket, engage in the arranged on the inner wall of the cylinder guide elements. As a result, a good transfer of torque from the cylinder is achieved on the pot. In addition, a good leadership of the pot is ensured within the cylinder. Alternatively or additionally, guide elements which engage in guide slots or grooves of the cylinder wall can be arranged on the outer wall of the pot mantle.

In an embodiment of the invention, the bottom of the pot is formed by a bottom plate which projects beyond the pot casing, whereby a stop surface is formed. As a result, an additional sealing surface between the cylinder and pot is achieved, whereby the tightness of the drilling bucket is further improved. Advantageously, the face of the cylinder facing the abutment surface of the pot plate is provided with a circumferential seal, preferably a fabric-reinforced rubber seal, wherein the abutment surface projecting beyond the pot jacket is preferably turned flat. As a result, the tightness of the drilling bucket is further increased.

In a further development of the invention, the end face of the cylinder (1) has an inner cone ring surface (182) which adjoins a sealing ring receptacle 18 accommodating the seal and the one with the abutment surface of the bottom plate - - arranged Außenkonusringfläche corresponds. As a result, a particularly high sealing effect is achieved.

In an embodiment of the invention, the cylinder, spaced from its outer lateral surface, encloses it at least two guide rings spaced apart from one another, which are preferably provided on their outer surface with obliquely extending webs arranged parallel to one another. As a result, even with suspension-supported holes without drill pipe a virtually cylindrical drilling is possible. In a further embodiment of the invention, a guide ring is axially adjustably attached to the cylinder at its end facing the bottom of the pot. As a result, the guide ring is displaceable in a lower position in which it can serve as a precutting ring at the same time.

In a further development of the invention, in the region of its upper half of the cylinder facing the locking device, preferably in the region of its upper third, at least one flow opening is introduced into its lateral surface, which is closable via arranged closing means. This allows a controlled outflow of suspension from the drilling bucket.

In an embodiment of the invention, the closing means comprise a closure ring having at least one opening, which is arranged rotatably on the outer circumferential surface of the cylinder, wherein the opening of which is at least partially overlapped with the Strömungsöff-. As a result, an easy-to-use and at the same time robust closing device is achieved.

In a further embodiment of the invention, a conical body is centrally applied to the bottom of the pot on its side facing the cylinder. This achieves improved emptying, especially with large pot diameters.

Other developments and refinements of the invention are specified in the remaining subclaims. An embodiment of the invention is in the - -

Drawings are shown and will be described in detail below. Show it:

Figure 1 is a schematic representation of a drilling bucket in locked

Pot position;

FIG. 2 shows the illustration of the drilling bucket from FIG. 1 in unlocked pot position;

Figure 3 shows the detailed representation of the sealing ring assembly of the drilling bucket

FIG. 1;

Figure 4 is a schematic representation of a drilling bucket in a further

embodiment;

Figure 5 shows the representation of the drilling bucket from Figure 4 in longitudinal section;

Figure 6 shows the detailed representation of the seal assembly of the drilling bucket

Figure 5;

Figure 7 shows the representation of individual parts of the cutting receiving

Cutting support of the drilling bucket from FIG. 5:

a) cutter carrier;

b) cutting edge;

FIG. 8 shows the illustration of the drilling bucket from FIG. 4 in another

Partial section and

9 shows the illustration of the drilling bucket from FIG. 4 with a sketched bottom view.

The drilling bucket chosen as the embodiment consists essentially of a cylinder 1, which is connected via a telescopic rod 2 with a pot 3, which is verriegeibar via a locking device 4 with the cylinder 1

The cylinder 1 is formed substantially hollow cylindrical and closed at its opposite side of the pot 3 with a cover plate 11. On the cover plate, a coupling 12 is mounted centrally for receiving a drill string. Spaced apart from the coupling 12, two openings 13 are arranged diametrically opposite one another in the cover plate 11, which openings are beveled on their outer side facing the coupling 12. On its lateral surface, the cylinder 1 has peripheral ribs 14, which are provided with guide webs 15. - - are seen and between which flow channels 16 are formed. The guide webs 15 serve to guide on the inner wall of a drilling bucket surrounded the drilling bucket. The flow channels 16 serve the passage of displaced by the drilling bucket water within a drill pipe. At its opposite side of the coupling 12, the cylinder 1 is provided on the front side with a sealing ring 17, which is made in the embodiment of fabric-reinforced rubber and is held dimensionally stable in a sealing ring 18. On its inner circumferential surface, the cylinder 1 is provided with guide pins 19 for engagement in guide slots 34 of the pot 3.

The pot 3 is formed substantially hollow cylindrical and has an outer diameter which is slightly smaller than the inner diameter of the cylinder 1. The pot 3 is closed on its side facing away from the cylinder 1 with a bottom plate 31 which projects beyond the pot shell 30, whereby a stop surface 32 is formed. The bottom plate 31 is formed in a known manner as a rotary bottom with a closure plate 311 closable via a filling opening 312, as described for example in DE 1 936 010 U. In the pot jacket 30 spaced from each other semicircular outflow openings 33 are formed adjacent to the bottom plate 31. Furthermore, four guide slots 34 are introduced into the pot shell 30 of the pot 3, each circumferentially offset by 90 °, in which guide pins 19 of the cylinder 1 engage. Centric in the bottom plate 31 has a bore 35 for the passage of the telescopic rod 2 is introduced. Surrounding the bore 35, a flange part 36 is arranged on the bottom plate 31, which in turn centrally has a bore 37 for the passage of the telescopic rod 2 and against which a pilot cone 21 connected to the telescopic rod 2 rests. On its underside facing the pilot cone 21, a cutting edge 38 is attached to the bottom plate 31, which is designed as a rotary bottom, and bears against the flange part 36 and is partially covered by the pilot cone 21.

The locking device 4 comprises two bolts 41 which are pivotally connected via an axle 411 to a cross member 42 which is fixed to the telescopic rod 2. At its cover plate 1 1 facing the end of the latch 41 are provided with a hook piece 412, the at his outwardly directed side has a sliding bevel 413. The latches 41 are biased by a spring element (not shown) in the direction of the ribs 14, which is fastened at one end to the axle 411 and at the other end to a bolt 414 arranged on the side of the bolt 41 opposite the handpiece 412 ,

The locking device 4 further comprises two Federteieskopstangen 43, which are arranged opposite to the coupling 12 opposite side of the openings 13 on the cover plate 11. Instead of spring telescope rods, of course, other linearly compressible spring elements can be used, such as in a linear guide movable spring bolt. The Federteieskopstangen 43 are each provided with a trapezoidal Entriegelungsfahne 44, which have a sliding surface 441 on its side facing the respective opening 13 side. The slope of the sliding surface 441 of the Entriegelungsfahnen 44 corresponds substantially to the slope of the sliding bevels 413 of the latch 41. At its cover plate 11 opposite end of the Federteieskopstangen 43 are guided in holes of a stop plate 45 which is attached to the coupling 12 of the cylinder 1 is.

FIG. 1 shows the drilling bucket according to the invention in the unlocked state. If the drilling bucket with its pilot cone 21 placed on the ground, the pot 3 is inserted into the cylinder 1, wherein the pot 2 via the guide pins 19, which engage in the guide slots 34, is guided. At the same time, the telescopic rod 2 is pushed together, whereby the associated with this cross member 42 is moved in the direction of the cover plate 11 of the cylinder 1, wherein at the same time the pivotally mounted on the cross member 42 and outwardly arranged latch through the openings 13 of the cover plate 1 are moved. The sliding bevels 413 slide the bolt 41 along the tapered sides of the openings 13 along until the hook pieces 412 of the outwardly biased latch 41 engage behind the cover plate 11. The bucket is now locked. In this case, the plane-turned stop surface 32 of the pot 3 is sealingly against the sealing ring 17. The filling openings 33 of the pot 3 are covered by the pot jacket 30; the bucket is closed. - -

The drilling bucket is connected to a - not shown - boring bar a - not shown - rotary drilling rig, which is connected to the coupling 12 of the cylinder 1. For unlocking the drilling bucket is pulled over the drill rod against the top plate of the pressure pipe of the drilling rig, whereby the Federtele- telescoping rods 43 are pressed against the cover plate 11 of the drilling bucket.

Here, the Entriegelungsfahnen 44 are moved with their sliding surfaces 441 against the sliding bevels 413 of the latch 41, whereby the latch 41 are pressed against the spring bias in the direction of the telescopic rod 2. FIG. 2 shows the spring telescopic rods 43 with their unlocking lugs 44 for clarification in different positions. In the illustrated on the right half of the positioning of the Entriegelungsfahne 44 of the voltage applied to this latch 41 is pivoted inward to the extent that it can pass through the opening 13 of the cover plate 11. In this position, the unlocking lugs 44, the locking device 4 is unlocked, which is why the connected to the telescopic rod 2 pot 3 is moved due to gravity down, whereby the open state, as shown in Figure 1, is achieved.

During operation, the bucket is lowered into the drill pipe until it rests on the drill bit or soil. In order to achieve a balance between the water pressures in the borehole and the surrounding soil, the drill pipe is filled with water. The flow channels formed on the outer jacket of the cylinder 1 by the spaced-apart ribs 14 thereby prevent a "floating" of the drilling bucket. If the drilling bucket is located on the cuttings, it is rotated clockwise via the boring bar connected to the coupling 12. The bottom plate 31 designed as a rotary bottom releases the opening for conveying the bottom plate in a known manner. By means of the cutting edge 38, the cuttings are released and passed through the delivery opening in the pot 3. After the cut has been made, the drilling bucket is rotated about 2 to 3 revolutions counterclockwise, whereby the delivery opening of the bottom plate designed as a rotary bottom is closed in a known manner. The possible angle of rotation of the bottom plate formed as a rotary bottom is limited in both directions by stops. - -

The filled bucket is pulled out of the drill pipe and swiveled to an unloading point. To open the drilling bucket according to the invention, the spring telescopic rods 43 are pulled under the top plate of the pressure tube of the - not shown - rotary drilling unit. In this case, the Entriegelungsfahnen 44 are moved down ^' and the locking device 4 is unlocked in the manner described above. The entire pot 3 is moved downwards, whereby the outflow openings 33 are released. The cuttings are thereby ejected. The downward movement of the pot 3 is limited by the guide pins 19, which project through the guide slots 34 of the pot 3. These guide pins 19 also absorb the torques during drilling operation. To close the drilling bucket of the drilling bucket is lowered to the ground until the latch 41 pass through the openings 13 of the cover plate 11 and the hook pieces 412 rest on the cover plate 11. FIGS. 4 to 7 show a further embodiment of the boring bucket according to the invention, which is particularly suitable for suspension-supported drilling. Since this eliminates the leadership through the drill pipe, the drilling bucket is provided with a self-centering cutting geometry comprising two cutting edges 38. In order to avoid any distortion of the bottom plate 31, in particular by heat, a blade carrier 381 is fastened by means of screws, which receives the two cutting edges 38.

Spanning the ribs 14 of the cylinder 1, spaced apart from one another on the cylinder 1, are three guide rings 141, which are provided on their outer surface with obliquely extending webs 142 arranged parallel to each other. By this arranged on the cylinder 1 in addition to different levels guide rings 141 a nearly cylindrical drilling is possible. The limited between the cylinder 1 and the guide rings 141 by the ribs 14 flow channels 16 must be sufficiently large to avoid a suction when pulling the Bohrhreers.

In Ausführungsbeispiei the lower, the bottom plate 31 facing, guide ring 141 is disposed axially displaceably on the cylinder 1. For this purpose, the guide ring 141 via mounting lugs 140 in different positions - - releasably secured to fastening webs 151 of the cylinder 1. In Figure 5, the left half ring of the guide ring 141 is shown in the upper position and its right half ring in the lower position for illustrative purposes. In the lower position, the lower guide ring 141 also serves as Vorschneidring.

In the region of the upper, the locking device 4 facing third of the cylinder 1 flow openings 131 are introduced in the wall, which are closable via locking rings 143 which are rotatably mounted on the outer circumferential surface of the cylinder 1. In the exemplary embodiment, the flow openings 131 are designed as radially oriented elongated holes, wherein the flow openings 131 are arranged on several levels, each of which is covered by a closure ring 143. The closure rings 143 are provided with correspondingly radially formed oblong holes 144, which are positioned such that in a rotational position of a closure ring 143, all flow openings 131 of one plane are in register with a slot 144 (flow openings 131 are open). The locking rings 143 are guided by recesses 145 introduced into the ribs 14 for this purpose, by means of which they are axially secured. Furthermore, support ribs 146 are arranged on the outer circumferential surface of the cylinder 1 for guiding the locking rings 143 in each case radially in sections.

On its side opposite the coupling 12, the cylinder 1 is again provided on the face side with a sealing ring 17, which in the exemplary embodiment is made of fabric-reinforced rubber and is held in a dimensionally stable manner in a sealing ring receptacle 18. Adjoining the sealing ring receptacle 18 is an inner cone ring 181, whose inner cone ring surface 182 sealingly corresponds to an outer cone ring surface 321 arranged on the stop surface 32 of the bottom plate 31. As a result, a particularly high sealing effect is achieved, which ensures that the Bohrgutfüllung in the pot 3 of the drilling bucket bieibt. Furthermore, the bottom plate 31 is provided for better drainability of the pot 3 inside with a pour cone 313.

Claims

claims

Drilling bucket for attachment to the drill pipe of a drill, with a bottom having a closable filling opening, which is provided with a cutting device, characterized in that the drilling bucket a within a cylinder (1) displaceable pot (3) summarizes, in whose pot shell ( 30) at least one outflow opening (33) is introduced, which is closed in an insertion position of the pot (3) by the cylinder jacket (1), wherein closure means for releasably fixing the pot (3) are arranged in the insertion position.

Drilling bucket according to claim 1, characterized in that the pot (3) with the cylinder (1) via a telescopic rod (2) is connected, at one end to the bottom of the pot and at the other end to the cylinder (1) end closing Cover plate (11) is attached.

Drilling bucket according to claim 2, characterized in that the telescopic rod (2) passed through a hole introduced into the bottom of the pot (35) and the end with a bore (35) projecting pilot cone (21) is connected, which is fixed to the bottom of the pot.

Pile bucket according to claim 2 or 3, characterized in that the closure means by at least one, preferably at least two on the telescopic rod (2) fastened, pivotable, end having an undercut latch (41) are formed by an associated in the cover plate (11 ) arranged opening (13) are pushed through in such a way that they engage behind the cover plate (11) in the insertion position of the pot (3).

Pile bucket according to claim 4, characterized in that the bolt (41) are biased by a spring in the closing direction, wherein the latch (41) preferably at the end a sliding bevel (4 3), with which they pass through the opening (13) of the Slide the cover plate (11) along it.

6. drilling bucket according to claim 5, characterized in that on the cover plate (1) at least one provided with an opening element spring telescopic rod (43) is arranged, by which upon actuation of the at least one latch (41) is pivotable against its bias, whereby the closure means can be unlocked, wherein preferably at least two provided with an opening element spring telescopic rods (43) for unlocking a respective bolt (41) are arranged, which in a spaced from the cylinder (1) arranged stop plate (45) are guided.

7. Bucket according to one of the preceding claims, characterized in that in the pot jacket (30) at least two vertical guide slots (34) are introduced, in which on the inner wall of the cylinder (1) arranged guide elements engage and / or that on the outer wall of the Cup mantle guide elements are arranged, which engage in guide slots or grooves of the cylinder wall.

8. drilling bucket according to one of the preceding claims, characterized in that the pot bottom is formed by a bottom plate (31) which projects beyond the pot jacket (30), whereby a stop surface (32) is formed.

9. drilling bucket according to claim 8, characterized in that the stop surface (32) of the pot plate (31) facing the end face of the cylinder (1) with a peripheral seal, preferably a fabric-reinforced rubber sealing ring (17) is provided, preferably via the pot shell (30) projecting abutment surface (32) is at least in the contact area with the peripheral seal is turned flat.

10. drilling bucket according to claim 9, characterized in that the end face of the cylinder (1) has a Innenkonusringfläche (182), which adjoins a seal receiving the sealing ring receptacle (18) and with a on the stop surface (32) of the bottom plate (18). 31) arranged Außenkonusringfläche corresponds.

11. drilling bucket according to one of the preceding claims, characterized in that the cylinder (1) spaced from its outer circumferential surface this enclosing at least two spaced-apart guide rings (141), which preferably arranged on its outer surface with mutually parallel, obliquely extending webs (142 ) are provided.

12. drilling bucket according to claim 11, characterized in that on the cylinder (1) at its end facing the bottom of the pot, a guide ring (141) is mounted axially adjustable.

13. drilling bucket according to any one of the preceding claims, characterized in that in the region of the locking device (4) facing the upper half of the cylinder (1), preferably in the region of its upper third, in its lateral surface at least one flow opening (131) is introduced, the can be closed via arranged closing means.

14. drilling bucket according to claim 13, characterized in that the closing means comprise a at least one opening having closure ring (143) which is rotatably mounted on the outer circumferential surface of the cylinder (1), wherein the opening with the flow opening (131) at least partially in coverage can be brought.

15. drilling bucket according to any one of the preceding claims, characterized in that on the bottom of the pot on its side facing the cylinder (1) centrally a cone body is applied.