DE202015102848U1 - Core drilling tool for rock drilling - Google Patents

Abstract

Core drilling tool for rock drilling with a tubular base body (12) having on its underside a cutting device (30) for working rock material to form a core, along an outer side of the tubular base body (12) at least one outer conveyor coil (14) for conveying the processed rock material is arranged, characterized in that along an inner side of the tubular base body (12) at least one inner conveyor coil (16) is arranged.

Description

The invention relates to a coring tool for rock drilling with a tubular base body which has on its underside a cutting device for working off rock material to form a core, wherein along an outer side of the tubular body at least one outer conveyor coil for conveying the processed rock material is arranged according to the preamble of claim 1.

Core drilling tools are used in particular for harder soil material, which is referred to below as rock to create holes. In a coring tool, the cutting action is limited to a substantially annular cutting area so that a pin-like core forms during drilling. This drill core often dissolves due to the vibrations when drilling itself from the surrounding soil or can be selectively separated in a foot area. Such a coring tool, for example, goes from the US 1,512,841 out.

A significant advantage of such a method of rock drilling is that not all of the rock material within a bore must be crushed by the cutter. Rather, the forming mandrel-like core can be removed as a larger piece of rock from the wellbore.

From the DE 34 22 541 A1 or the US 3,095,051 core drilling tools emerge, in which the forming core can be added as a soil sample in the tubular body of the drilling tool and removed from the wellbore.

Furthermore, from the EP 0 933 497 B1 a drilling tool is known in which a forming core is used to guide the drill. The forming core is derived by a deflection surface in a delivery area of the outer drill spiral.

Overall, core drilling tools allow for very efficient drilling in hard soil materials because only a portion of the pending soil material must be crushed to form a wellbore. This is energy efficient. However, with increasing training of extending within the drilling tool core, the friction and thus the necessary during drilling force and energy consumption.

The invention has for its object to provide a coring tool for rock drilling, with which a core drilling can be performed very efficiently.

The object is achieved according to the invention by a coring tool with the features of claim 1. Preferred embodiments of the invention are indicated in the dependent claims.

The drilling tool according to the invention is characterized in that at least one inner conveyor coil is arranged along an inner side of the tubular base body. With this inner conveyor coil, a conveying effect can be generated along the inside of the base body and thus along the forming core. Depending on the direction of rotation, it is possible for example to carry off discharged rock material which is located between the drill core and the tubular base body. In principle, it is possible to remove this processed soil material against the drilling direction from the tubular base body, in particular upwards.

A particularly preferred embodiment of the invention is that the inner conveyor coil is formed with an inner conveying direction, which is opposite to a conveying direction of the outer conveyor spiral. In particular, in a wet drilling with a rinsing and cooling liquid as a targeted flow and pumping action can be adjusted so that processed rock material can be removed from the range of the cutting device on the underside of the core drilling tool. In this case, the inner conveyor coil is designed so that along the inside of the tubular body selectively rinse liquid is conveyed or pumped to the cutting device. The liquid can thus cool the cutting tools as well as the pending rock material, and due to the conveying action of the outer conveying spiral, the rinsing liquid can be removed again from the borehole bottom and the cutter counter to the boring direction, in particular upwards, together with the excavated rock material.

The rinsing liquid can emerge from the borehole in an essentially known manner in an upper region of the borehole or can be carried away therefrom in order, if appropriate, to be recirculated into the borehole after a separation of the rock material.

To generate a good flow, it is provided according to an embodiment of the invention that an access opening for the entry of liquid is provided in a pipe interior of the body at an upper portion of the body. At the access opening can In principle, be connected to a feed line to introduce about fresh rinse liquid directly into the core drilling tool. The access opening may be formed centrally, so that a supply could be made via a hollow drill pipe. Optionally, the access opening may also be provided at another location, wherein a supply via a separate supply line from the outside. In a simple embodiment, no line connection can be provided at the access opening, so that rinsing liquid is sucked from an upper region of the bore via the inner conveyor spiral and conveyed down to the cutting device. A separate pump with an appropriate power supply is not necessary. Rather, the pumping action can be applied exclusively by the rotational movement of the core drilling tool.

For the release of harder soil material, it is advantageous according to a further embodiment variant of the invention that the cutting device has at least one rotatably mounted roller chisel. Preferably, a plurality of roller bits are arranged annularly along the lower edge of the tubular base body. The rolling chisels rolling on the pending rock material during the rotary movement of the core drilling tool cause a punctual application of force, which leads to the release of even harder rock material.

In principle, the cutting device can have any suitable removal element which can be selected depending on the pending soil. A preferred embodiment of the invention is that the cutting device has at least one fixed erosion tooth. The erosion tooth alone or in addition to the action of the roller bits may cause soil erosion.

A particularly preferred embodiment according to the invention is that the erosion tooth is offset in relation to a removal surface of the roller bit in the direction of the base body. In particular, with harder rock material so the removal is applied essentially by the roller bits, while the erosion teeth bestabstandet from the bottom of the hole absorb the already crushed, worn rock material and remove it from the work space.

In this case, according to a development of the invention, a particularly expedient operation in that the Abtragszahn is formed as a flat tooth with a tooth flank, which merges flush into the outer conveyor coil. The abraded soil material is thus passed over a flat tooth flank of the flat tooth to the outer conveyor spiral, and so can be conveyed further upwards. The removed soil material thus does not constitute an obstacle for further processing by the roller bits.

A further advantageous embodiment of the invention results from the fact that the at least one roller bit and / or the at least one erosion tooth are interchangeably mounted on the base body. In particular, brackets may be provided on the base body, in which the respective removal elements are detachably inserted. Since the ablation elements, such as the roller bits or the Abtragszähne, are exposed to high wear, they can be changed quickly, allowing efficient operation of the core drilling tool.

In principle, the number as well as the shape and pitch of the conveying helixes can be designed as desired on the core drilling tool. According to one embodiment variant of the invention, it is particularly efficient that a pitch of the inner conveyor helix is greater than a pitch of the outer helix. It is thus causes a relatively strong flow of rinsing liquid to the cutting device. This supports the flushing of the cutting devices and also an upward conveyance of the removed soil material due to the displacement principle.

According to a further embodiment of the invention, it is expedient that at an upper end of the drilling tool, a connection device for a drill pipe and / or a collecting container for soil material is arranged. In particular, the connection device can be a so-called Kelly connection with which a drill rod, in particular a Kelly rod, can be detachably fastened in the usual way. The core drilling tool can thus be used on conventional drilling rigs. Furthermore, a collecting container for processed soil material can be provided at the upper end region. This can be formed by a wall ring which can be opened for emptying, in particular pushed upwards.

With regard to the drilling method with the core drilling tool according to the invention, it is provided that an inner conveyor spiral is provided on an inner side of the tubular base body, by means of which a conveying action is generated along the inner side of the main body. As a result, a reduction in friction and thus a reduction in the expenditure of energy and energy during drilling can be achieved, as explained above.

An advantageous embodiment of the method is that by the inner conveyor coil washing liquid in the drilling direction to the Cutting device is conveyed along the inside of the body, while carried by the outer conveyor spiral removed rock material with the rinsing liquid in the opposite direction of the cutter. The fluid flow thus obtained within the core drilling tool and the bore reduces the friction between the core drilling tool and the surrounding rock material as well as the inner core. At the same time the rock material and the core drilling tool are cooled, which leads to an overall reduction in wear. In addition, a reliable removal of the excavated rock material is achieved at the bottom of the hole, whereby the effectiveness of the cutting device is supported. In addition, the excavated rock material can be reliably removed from the wellbore. This also supports drilling progress and reduces friction during drilling.

The invention will be further elucidated on the basis of preferred exemplary embodiments, which are illustrated schematically in the attached drawings. In the drawings show:

1 a perspective view of a first core drilling tool according to the invention;

2 a side view of the core drilling tool of 1 ;

3 a schematic view of the coring tool according to 2 without the annular base body;

4 a view of the coring tool according to the invention according to 2 from underneath;

5 a perspective view of a second embodiment of a core drilling tool according to the invention;

6 a schematic side view of the coring tool according to 5 without the tubular body; and

7 FIG. 5: another schematic side view rotated by 90 ° of the coring tool according to FIG 6 ,

A first embodiment of a core drilling tool according to the invention 10 will be discussed below in connection with 1 to 4 explained. The core drilling tool 10 has a tubular body 12 which can typically have a diameter between 0.5 m and 1.0 m. At an underside of the main body 12 is an annular cutter 30 with a retaining ring 32 arranged. The retaining ring 32 is at the lower end of the tubular body 12 attached, in particular welded. Along the underside of the retaining ring 32 In this embodiment, a total of six roller bits 34 and two erosion teeth offset by 180 ° from each other 38 arranged.

The roller chisels 34 each have a roll holder 35 on, which on the retaining ring 32 screwed on. Furthermore, the roller bits include 34 a conical reel body 36 which rotatably attached to the respective roll holder 35 is stored. Along the outside of the reel body 36 a plurality of chisel-shaped removal tips for working hard soil material is arranged.

Furthermore, the cutting device 30 two opposing teeth 38 on, which are each formed as a flat tooth. The erosion teeth 38 are detachable in an approximately hemispherical trained Kalottenaufnahme 40 held, which in turn on a bracket 41 is welded. The hanger 41 is fixed to the retaining ring 32 connected. The erosion tooth 38 is arranged so that its front cutting edge opposite to a removal surface of the roller chisel 34 , So the drilling hole forming ground, opposite to the drilling direction to the body 12 is set back. The erosion tooth 38 thus does not come into direct contact with the upcoming rock material at the bottom of the well. Rather, the erosion tooth is used 38 in the present embodiment to that of the roller chisel 34 taken up processed and crushed soil material and a tooth flank 39 of the ablation tooth 38 to an outer conveyor coil 14 along the outside of the tubular body 12 to lead. This is the tooth flank 39 of the ablation tooth 38 with the interposition of a transfer plate 42 flush in the outer conveyor spiral 14 above.

In the in the 1 to 4 illustrated embodiment of the core drilling tool 10 are along the outside of the main body 12 a first outer conveyor coil 14a and a second outer conveyor coil 14b arranged. These open at their lower end in each case in a Abtragszahn 38 , In this way, that can be done by the roller chisel 34 processed and crushed rock material from the oblique to the drilling direction Abtragszähnen 38 taken and to the two outer conveyor spirals 14a . 14b be directed. Due to the rotational movement of the core drilling tool 10 Thus, the removed soil material along the outside of the body 12 conveyed upwards against the direction of drilling.

The drilling torque is applied to the core drilling tool 10 transmitted by a drill rig, not shown, by a drilling rig. The Drill pipe opens into a connection device 20 which is formed in the present embodiment as a Kellybox. The connection device 20 is via stiffening plates on a radially directed cover plate 18 welded. Above the cover plate 18 closes to the tubular body 12 a wall ring 19 of the same diameter, through which a collecting container 15 is formed. The collection container 15 can absorb soil material, which through the outer conveyor spiral 14 is promoted to the top. The wall ring 19 is along stiffening sheets 24 mounted axially displaceable. By pushing up the wall ring 19 up to upper angle stops 25 can the collection container 15 be opened for emptying.

During a rotating operation of the core drilling tool 10 becomes the upcoming rock material through the annular cutter 30 processed annular, wherein a mandrel-shaped core is formed, which in a tube interior 13 of the basic body 12 protrudes. To reduce the friction, for cooling and for efficient removal of the removed rock material in a wet drilling has the core drilling tool shown 10 along an inner side of the tubular base body 12 a first inner conveyor coil 16a and a second inner conveyor coil 16b which are equal but offset by about 180 °. The helical direction of the inner conveyor spiral 16 is opposite to the helical direction of the outer conveyor helix 14 educated.

In a rotary operation of the core drilling tool 10 is through the inner conveyor coil 16 Rinsing fluid within the generated borehole via two access openings 22 in the cover plate 18 at the upper end of the core drilling tool 10 sucked and down to the cutting device 30 promoted. The access openings 22 are up through channel-forming sheets against the collecting container 15 separated. In this way, a good washout of itself within the core drilling tool 10 forming core. This reduces the friction wear and the energy expenditure.

Furthermore, the cutting device 30 at the lower end of the core drilling tool 10 through the through the pipe interior 13 pumped flushing fluid flows around targeted, so that thereby also a reliable discharge of the removed rock material on the outer conveyor coil 14 is supported.

In the 5 to 7 is a second embodiment of a core drilling tool according to the invention 10 shown. The basic structure of this core drilling tool 10 with a lower annular cutter 30 , an upper connection device 20 , a collection container 15 and a tubular body 12 with an outer conveyor coil 14 and an inner conveyor coil 16 corresponds to the structure of the core drilling tool 10 according to the 1 to 4 ,

A significant difference, however, is that the core drilling tool 10 after the 5 to 7 formed with a larger diameter of about 1.5 m to 2.0 m, so that on a retaining ring 32 the annular cutter 30 all in all 14 roller bits 34 are arranged. Furthermore, in opposing arrangement two Abtragszähne 38 between the roller bits 34 appropriate. 90 ° offset to the erosion teeth 38 are on the retaining ring 32 two plate-shaped attachment elements 44 arranged to stabilize the position of the core drill 10 to support at a bottom of the well and a removal depth of the roller bits 34 to limit.

Basically, the cutting device 30 arranged so that the associated Abtragselemente, in particular the roller chisel 34 , the area below the tubular body 12 with a certain radial overcut cut radially inward and radially outward, so that a free space for the inner conveyor coil 16 and the outer conveyor coil 14 is formed.

According to the core drilling tool 10 The first embodiment extends along an inner side of the main body 12 a first inner conveyor coil 16a and a second inner conveyor coil 16b of access openings of an upper cover plate 18 to the bottom cutting device 30 , The inner conveyor spiral 16a . 16b are designed so that in the rotary drilling operation rinsing liquid from top to bottom to the cutting device 30 is encouraged.

The first outer conveyor spiral 14a and the second outer conveyor coil 14b are formed in the opposite direction, so that this removed in drilling operation rock material and rinsing liquid along the outside of the body 12 promote upward.

To initiate the torque is at the top of the coring tool 10 a connection device 20 , in particular a Kellybox, arranged, which over stiffening plates 24 with the upper cover plate 18 is firmly connected. Above the cover plate 18 becomes the tubular body 12 through a ring wall 19 which, in the upper area, the connection device 20 at least partially surrounds. The wall ring 19 encloses a receiving space of a collecting container 15 , The wall ring 19 is axially upwards displaceable with respect to the cover plate 18 and the body 12 along the stiffening sheets 24 stored. The outer conveyor spiral 14 points at the transition to the wall ring 19 a parting line 17 on and is so on the wall ring 19 continued. For emptying the wall ring 19 with the upper part of the outer conveyor spiral 14 up to the angle stops 25 be moved up.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 1512841 [0002]
• DE 3422541 A1 [0004]
• US 3095051 [0004]
• EP 0933497 B1 [0005]

Claims (10)

Core drilling tool for rock drilling with a tubular base body ( 12 ), which on its underside a cutting device ( 30 ) for working off rock material to form a drill core, wherein along an outer side of the tubular body ( 12 ) at least one outer conveyor coil ( 14 ) is arranged to convey away the excavated rock material, characterized in that along an inner side of the tubular body ( 12 ) at least one inner conveyor coil ( 16 ) is arranged. Core drilling tool according to claim 1, characterized in that the inner conveyor spiral ( 16 ) is formed with an inner conveying direction, which to a conveying direction of the outer conveyor spiral ( 14 ) is opposite. Core drilling tool according to claim 1 or 2, characterized in that at an upper area an access opening ( 22 ) for the admission of liquid into a tube interior ( 13 ) of the basic body ( 12 ) is provided. Core drilling tool according to one of claims 1 to 3, characterized in that the cutting device ( 30 ) at least one rotatably mounted roller chisel ( 34 ) having. Core drilling tool according to one of claims 1 to 4, characterized in that the cutting device ( 30 ) at least one fixed erosion tooth ( 38 ) having. Core drilling tool according to claim 5, characterized in that the erosion tooth ( 38 ) with respect to a removal surface of the roller bit ( 34 ) in the direction of the main body ( 12 ) is relocated. Core drilling tool according to one of claims 4 to 6, characterized in that the at least one roller chisel ( 34 ) and / or the at least one erosion tooth ( 38 ) replaceable on the base body ( 12 ) are mounted. Core drilling tool according to one of claims 5 to 7, characterized in that the erosion tooth ( 38 ) as a flat tooth with a tooth flank ( 39 ) is formed, which flush in the outer conveyor coil ( 14 ) passes over. Core drilling tool according to one of claims 1 to 8, characterized in that a slope of the inner conveyor spiral ( 16 ) is greater than a slope of the outer conveyor spiral ( 14 ). Core drilling tool according to one of claims 1 to 9, characterized in that at an upper end of the base body ( 12 ) a connection device ( 20 ) for a drill pipe and / or a collecting container ( 15 ) is arranged for soil material.

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