EP2801460B1 - Drill with borehole cleaning elements for drilling and cleaning a borehole - Google Patents

Description

The invention relates to a drill for drilling and cleaning a borehole, a drilling assembly, a method for drilling and cleaning a borehole and a use.

When drilling holes with a drill, for example, in concrete a not inconsiderable amount of drilling dust accumulates, which can lead as a particulate matter to a health impairment of a fitter when a fitter inhales this uncontrolled. For this reason, it is desirable to selectively remove drilling dust from the hole during drilling. Also, an achievable holding force in fixing a fixing anchor in a wellbore by means of a chemical dowel, i. increased by means of a hardenable hardening material to be introduced into the borehole, through a clean drilled hole that is substantially free from drilling dust.

The company Hilti offers for a mortar system with injection mortar the system Hilti HIT-HY 200 and corresponding hollow drills TE-CD or TE-YD. Accordingly, a hollow drill is provided with at least one hole in the drill behind the drill bit, can be sucked through the drilling dust with a vacuum cleaner immediately after its emergence. However, if necessary, the drill hole must then be brushed with a brush to achieve a clean bond or attachment with the help of a chemical anchor.

DE 39 19 095 A1 discloses a rock drill from a drill bit, a clamping shaft and an intermediate conveyor spiral. The conveyor coil has helically or spirally arranged brushing members for cleaning the borehole of drill dust. The brushing members may be bristle bundles and / or elongated strip brushes. The effective one Outer diameter of the brush elements extends at least to the drill nominal diameter.

DE 197 57 424 A1 discloses a device for well cleaning, which is introduced into a previously created in a subsoil wellbore. A tubular shaft is inserted at a male end into a tool holder of a drill. A cavity in the shaft opens into the wellbore at an opposite end. Furthermore, the shaft has an opening in the region of the insertion end as an air access. On its outside, the shaft is equipped with brushing devices in the form of plastic bristles which extend radially to the borehole wall. A pot-shaped suction head is provided with a passage opening for the shaft and connected to the shaft accordingly. The suction head has a connection for a vacuum cleaner, which is connected via a hose. To drill hole cleaning the device is inserted into the tool holder of the drill and introduced into the hole. As the shaft rotates through the drilling tool, the brushing members strip off the debris adhering to the borehole wall. By the negative pressure generated by the vacuum cleaner air is sucked through the opening, which exits at the mouth and promotes the drilling dust to the suction head.

DE 10 2008 001 908 A1 reveals one too DE 197 57 424 A1 similar device, wherein a suction opening of the adjacent region of the shaft is designed as a handle.

DE 10 2010 063 859 A1 discloses a tool for cleaning a wellbore having a tool shank and a conveying element for removing drilling dust from the wellbore. The conveying element is attached to the tool shaft and arranged in the axial direction helically around the tool shaft.

Thus, the provision of clean wells for reasons of safety and the strength of chemical dowels is traditionally still very expensive.

It is an object of the present invention to enable the formation of a cleaned wellbore quickly, easily and reliably.

This object is solved by the objects with the features according to the independent claims. Further embodiments are shown in the dependent claims.

According to an exemplary embodiment of the invention, the operations of drilling a wellbore and cleaning it from accumulated drilling dust may be combined into a single operation. This can be achieved by providing not only a drilling section for the removal of substrate material (for example by means of hammering, scraping and / or chiselling) while producing drilling dust or drill dust, but also drill hole cleaning elements which are formed when the drill is withdrawn automatically make a brush-like cleaning of the borehole of drilling dust or drilling dust from the well, for example, without the need for a separate operation is required. The flexibility or elasticity of the radially projecting well cleaning elements allows insertion of the drill into the well without undue effort, while the well cleaning elements but also equal to the borehole wall biased or pressed against this under bending. Due to such contact pressure resulting from the radial protrusion, extraction of the drill from the well after completion of drilling due to sliding contact of the wells automatically results in disengagement of the debris from the well wall and extraction of the debris from the well. According to the invention therefore a combined and thus time-saving common extraction and cleaning movement of the drill is possible. As a result, a separate tool for cleaning the borehole can be saved as well as a separate cleaning operation.

Hereinafter, exemplary embodiments of the drill, the drilling assembly, the method and the use will be described.

According to one embodiment, the drill section may have a drill bit with adjoining drill edges for (in particular hammering) removal of material from the substrate. For example, with a kind of hammering motion, the drill bit tip can loosen material, especially concrete material, of the ground. Optional drill edges, which may extend from the drill bit towards the shank portion, can then contribute to the grinding or removal of the drill meal. Also, such drill edges can perform a kind of leadership function and support a scraping of the material of the substrate. According to other embodiments of the invention, however, the drilling section can be designed differently, depending on the underground material to be drilled, as is known to the person skilled in the art.

According to one embodiment, at least a portion of the wellbore cleaning elements may be formed as bristles that together form a type of brush. In particular, the well treatment elements may be formed as a plurality (for example at least 10, in particular at least 30, more particularly at least 100) of, for example, metallic wires or bristles which extend radially from the shank portion and bear against the borehole wall. The number and thickness of the well cleaning elements may be appropriately selected depending on the size of the drill.

According to one embodiment, at least a part of the well cleaning elements may be formed as slats extending in particular in the axial direction. Such fins may for example be made of flexible fabric, rubber or plastic material and form one or more lips which are linearly and continuously adjoining a borehole wall to the movement of the drill Drill down hole to clean and remove this possibly from the wellbore.

According to one embodiment, the shank portion may have an annular groove and the well cleaning elements may be mounted radially outwardly on a ring, the ring being permanently inserted into the annular groove on the shank portion (for example by shrinking, or releasably, for example by means of elastic coating ) fastened or attached. The ring can be formed of a flexible or elastic material such as plastic or rubber and can thus be over the shank portion or over the drill section to be pulled, and then to lock in the annular groove. After wear of the wellbore cleaning elements, the ring can be easily replaced by being withdrawn from the annular groove and replaced with another ring with wellbore cleaning elements. Also in this embodiment of the well cleaning elements a simple one-piece production of drill section and shaft portion is possible because then no integral with the drill hole cleaning elements drill must be formed, in which the drill hole cleaning elements with different hardness properties should be formed compared to drill section and shaft portion.

In one embodiment, the wellbore cleaning elements may be grouped into a plurality of well-spaced and non-contiguous wellbore purification element groups. For example, a plurality of axially spaced apart annular, in particular annular, Bohrreinigungselementgruppen may be provided. As a result, a free receiving volume for the transportable drilling dust can be formed between closed brush structures, which favors the removal of the drilling dust from the borehole.

In one embodiment, the wellbore cleaning elements may orbit helically or helically about the shaft portion. Also in this way is a particularly efficient removal of drilling dust from the well as the drill meal can then be conveyed along an uninterrupted helical path from the well interior to and from the wellbore mouth. The provision of spirally arranged well cleaning elements is also suitable for providing a plurality of such spiral-shaped structures in a space-saving manner separately from one another (for example parallel to one another), which additionally promotes efficient cleaning of the borehole.

According to one embodiment, the shank portion may include at least one helical coil (ie, a helix raised from the shank core), wherein the well cleaning elements spirally rotate on at least one of the at least one coil. For example, grooves may be arranged along the helix for receiving end portions of the wellbore cleaning elements. Recesses are then formed between adjacent spirals, along which the drilling dust can be removed efficiently and guided.

In one embodiment, the shank portion may include at least two helical coils, wherein the well cleaning elements are spirally orbited between two adjacent helices. The coils themselves can then remain free from well cleaning elements. According to this embodiment, depressions formed between adjacent coils (in which receiving grooves may be formed in turn) may be used to receive end portions of the well treatment elements.

According to one embodiment, the drill may have a sleeve which can be plugged over the shaft portion (for example, elastically plugged or shrinkable) and on the inside of the shaft portion attachable and on the outside of the hole cleaning elements are provided. Such a sleeve can be, for example, a hose made of plastic, rubber or a metallic material, which can be replaced as an exchange or replacement part, for example, if the well cleaning elements are worn. Both the assembly and disassembly of such a sleeve is intuitive and easy even for an untrained user.

According to one embodiment, the shank portion and the well cleaning elements may be integrally formed. According to this embodiment, shaft portion and well cleaning elements are integral and thus inseparable from each other. This allows a particularly mechanically strong connection of the drill hole cleaning elements with the base of the drill and thus represents a particularly robust embodiment. When producing a corresponding drill, the hardness properties of drill section and shaft section on the one hand and the well cleaning elements on the other can be set differently. In particular, the drill section should have a particularly high hardness for drilling hard surfaces, such as concrete, and can therefore be subjected to a specific hardening process. Conversely, the borehole cleaning elements for cleaning the borehole should have a flexible property and thus a reduced hardness, which can be effected by a selective aftertreatment of the wellbore cleaning elements on the shaft section, for example by controlled heating or a suitable heat treatment and cooling.

According to an embodiment, the entire surface of the shaft portion may be provided with wellbore cleaning elements. In other words, the shank portion may be free of areas that are free of wellbore cleaning elements, whereby a surface brush may be formed. This allows a full-surface and thus particularly efficient cleaning of the borehole wall.

According to the invention, in addition to the wellbore cleaning elements, the drill has a hollow channel having a first front outlet opening on the drill section and a second rear exit opening on the shaft section, the second outlet opening being coupled to a suction device for sucking the drill meal out of the borehole, preferably during drilling and / or during cleaning. As a result, a part of the drilling dust already before commissioning of the brushes or others Borehole cleaning structures are sucked, so that the brushes or other well cleaning structures then the remaining cleaning of the pre-cleaned well remains reserved.

According to one embodiment, the shank portion may taper from the drill portion towards the borehole exterior, that is, its core diameter may be successively reduced. Thus, the shank of the drill or the entire drill can be wedge-shaped. Thus, the grain or powdery material, such as drilling dust or drilling dust, can be transported along an outwardly increasing channel. Due to the described geometry, in addition to a dynamic reinforcing effect on extraction of the drill dust, since the distance between the borehole wall and the lateral surface of the drill increases toward the borehole exterior.

According to one embodiment, the well cleaning elements of the shaft portion can be made removable and thus exchangeable. Then it is possible, for example, after wear or tear of the drill hole cleaning elements or to install the most suitable for certain cleaning tasks drill hole cleaning elements replace the latter.

Alternatively, wellbore cleaning elements and shank portion may be integrally provided. For example, co-rolling of the brushes can also take place during rolling of the drill. In this embodiment, it should be noted that the shaft portion is preferably mechanically highly stable and the well cleaning elements should preferably be highly elastic. These sectionally different material properties of the drill can be achieved, for example, by selectively hardening the shaft section including the drill section, while leaving the well cleaning elements free from hardening. Alternatively, the shank section including the drill section and the well cleaning elements can be subjected to a common hardening process Subsequently, the well cleaning elements are selectively softened, for example by an annealing treatment.

According to one embodiment, the shank portion and the well cleaning elements cooperating fasteners for particular positive (or frictionally) or fastened to each other. The attachment should allow sufficient holding force to withstand the usual mechanical stresses during drilling and brushing of the borehole. For example, gluing, soldering, welding or pinching the well cleaning elements in grooves on the shaft portion is possible. It is also possible to produce a tongue and groove connection, a screw connection, a bayonet connection, a snap connection or a dovetail connection between the shank section and a support structure of the wellbore cleaning elements or the wellbore purification elements themselves.

According to the invention, the drilling assembly comprises a suction device for extracting drill dust from the borehole during drilling and / or during cleaning. Such a peristaltic vacuum can make it possible to suck a portion of the drill dust from the well and dispose of safely. According to one embodiment, the Bohrstaubsauger can be at least partially provided as part of the drill or thus in one piece. According to an alternative embodiment, the drill vacuum cleaner is a separate component from the drill. For sucking down borehole dust, a suitable supply air opening can be provided.

According to one embodiment, the drilling assembly may comprise an auxiliary body for laying on the ground, wherein in the auxiliary body, a first receiving opening for receiving the drill to the ground and a second receiving opening, which is preferably connected to the first receiving opening, for operatively connecting the Suction device with the drill hole to be drilled are provided. With such a configuration, a particularly safe disposal of the drill dust is possible. A user sets the auxiliary body directly on the substrate to be drilled and then drilled through the first receiving opening by means of the drill hole in the ground. A second receiving opening is connected to the Bohrstaubsauger, which sucks at least a portion of the resulting drill dust during the drilling process and thus disposed of.

According to one embodiment, during a portion of the process, the wellbore may be cleaned by axial (ie, along the direction of drilling) and / or radial (ie, circumferentially of the drill) movement of the wellbore cleaning elements along the wellbore, without drilling (FIG. that is to say, readily convert material of the subsoil into drilling dust). According to such a configuration, after completion of the drilling of the borehole, the drill is simply pulled out of the borehole at the back. The bristles or other drill hole cleaning elements slide along the borehole wall and clean them of remaining drilling dust. As a result of the movement of the drill, drilling dust detached from the borehole wall is simultaneously removed from the borehole. However, it is also possible, after completion of the drilling, to pull the drill back and forth one or more times in order to brush the borehole wall repeatedly cleanly. The stroke in this cleaning movement may comprise either the entire distance between the wellbore deepest and the well mouth, or only a portion of it, optionally with or without the use of a suction device.

According to one exemplary embodiment, the borehole can be drilled to a desired depth, in particular to a borehole deepest, and be moved at least once, in particular several times, starting from the nominal depth in the direction of the borehole mouth, after reaching the desired depth of the drills for at least partial removal of the drilled meal from the borehole , In particular, a and moving the drill bit between the wellbore bottom and the wellbore mouth is an effective means to clean the wellbore approximately completely of drill dust, optionally with or without the use of an aspirator.

According to one embodiment, during the movement, the drill may be rotated (in particular, continued or continued), even if drilling is discontinued. In this way, by the rotation of the drill, the cleaning effect of the brush can be further improved. This rotation can take place, for example, at 1000 to 3000 revolutions / min, in particular at 1500 to 2000 revolutions / min.

However, it is also possible to turn off the drive of the drill during brushing. In this case, for example, drilling may be initially performed, then the drill may be stopped and subsequently the borehole cleaned by moving the drill along the borehole by brushing.

In one embodiment, during at least part of the process, the drilling dust may be extracted from the wellbore. The synergistic interaction of a suction and a brushing process, a particularly clean hole can be achieved. The extraction of drilling dust also increases operational safety, as it effectively protects an operator from drilling dust.

• Fig. 1 bis Fig. 6 zeigen unterschiedliche Ansichten einer Bohranordnung bzw. eines zu bohrenden Untergrunds während eines Verfahrens zum Bohren und Reinigen eines Bohrlochs sowie zum nachfolgenden Verankern eines Verankerungselements in dem gebohrten Bohrloch gemäß einem exemplarischen Ausführungsbeispiel der Erfindung.
• Fig. 7 zeigt einen Bohrer mit an einem Ring angebrachten Bohrlochreinigungselementen zum Bohren und Reinigen eines Bohrlochs gemäß einem exemplarischen Ausführungsbeispiel der Erfindung.
• Fig. 8 zeigt einen Frontabschnitt eines Bohrers gemäß einem exemplarischen Ausführungsbeispiel mit einer Ringnut zum Aufnehmen eines in Fig. 9 gezeigten Rings mit radial angeordneten Bohrlochreinigungselementen gemäß einem exemplarischen Ausführungsbeispiel der Erfindung.
• Fig. 10 zeigt einen Frontabschnitt eines Bohrers gemäß einem anderen exemplarischen Ausführungsbeispiel der Erfindung mit einer zwischen zwei erhabenen Ringstrukturen gebildeten Ringnut zum Aufnehmen des in Fig. 9 gezeigten Rings mit radial angeordneten Bohrlochreinigungselementen gemäß einem exemplarischen Ausführungsbeispiel der Erfindung.
• Fig. 11 bis Fig. 15 zeigt Bohrer mit Bohrlochreinigungselementen zum Bohren und Reinigen eines Bohrlochs gemäß anderen exemplarischen Ausführungsbeispielen der Erfindung.
• Fig. 16 und Fig. 17 zeigen Anordnungen mit einem Bohrer mit Bohrlochreinigungselementen und mit einer Bohrmehlabsaugeinrichtung zum Bohren eines gesäuberten Bohrlochs gemäß exemplarischen Ausführungsbeispielen der Erfindung.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the following figures.

• Fig. 1 to Fig. 6 10 show different views of a drilling assembly or a substrate to be drilled during a method for drilling and cleaning a borehole and for subsequent anchoring of an anchoring element in the drilled borehole according to an exemplary embodiment of the invention.
• Fig. 7 shows a drill with attached to a ring borehole cleaning elements for drilling and cleaning a borehole according to an exemplary embodiment of the invention.
• Fig. 8 shows a front portion of a drill according to an exemplary embodiment with an annular groove for receiving a in Fig. 9 shown rings with radially arranged well cleaning elements according to an exemplary embodiment of the invention.
• Fig. 10 shows a front portion of a drill according to another exemplary embodiment of the invention with an annular groove formed between two raised ring structures for receiving the in Fig. 9 shown rings with radially arranged well cleaning elements according to an exemplary embodiment of the invention.
• Fig. 11 to Fig. 15 shows drills with wellbore cleaning elements for drilling and cleaning a borehole according to other exemplary embodiments of the invention.
• Fig. 16 and Fig. 17 show arrangements with a drill with well cleaning elements and with a Bohrmehlabsaugeinrichtung for drilling a cleaned well according to exemplary embodiments of the invention.

The same or similar components in different figures are provided with the same reference numerals.

• Gemäß der Erfindung erfolgt gleichzeitig mit dem Bohren des Lochs ein Ausbürsten desselben. Der Bohrer wird mit einer optional austauschbaren Bürste verbunden bzw. ausgestattet. Indem gleichzeitig mit dem Bohren (bzw. ausgelöst durch das Herausziehen des Bohrers aus dem unmittelbar zuvor gebohrten Bohrloch) ein Ausbürsten des Bohrlochs stattfindet, kann der herkömmlich erst nach dem Bohren des Bohrlochs folgende Arbeitsgang des separaten Ausbürstens entfallen.

Before describing exemplary embodiments of the invention with reference to the figures, some general aspects of the invention will be explained:

• According to the invention, simultaneously with the drilling of the hole, the same is brushed out. The drill is connected or equipped with an optional replaceable brush. By simultaneously with the drilling (or triggered by the extraction of the drill from the immediately previously drilled wellbore) takes place a brushing out of the borehole, the conventionally only after drilling the borehole the following operation of the separate brushing omitted.

Basis of an exemplary embodiment of the invention forms a formwork drill, which has a drill bit. The drill (for example, a hammer drill) is preferably made of high speed high speed steel (HSS). The drill bit may thus be an HSS drill bit or alternatively a diamond drill bit. The drill shank is made of HSS or high-strength steel, for example. Optionally, the drill has at least one turn of a drilling spiral on a rear side of the drill bit, preferably two or three or more than three drill screws. At a back of the drill bit and possibly the drill spiral, a tapering of the diameter takes place, which is then constant over the remaining length, whereby a straight shank portion is formed, for example. The particular smooth shaft portion serves to arrange on this brush elements.

In a first variant, a fabric or plastic tube, projecting from the bristles radially outwards, pulled over the particular smooth shaft portion and preferably fastened by means of fastening means on the shaft portion to prevent it from slipping relative to the drill. The hose can be a fabric or plastic hose or a metal hose.

In a second variant, for example, in the helix of the drill or in the space between two Bohrwendelgängen locking means, such as grooves, arranged in the brush elements (brush strips or brush surface elements such as brush bundles) can be inserted or attached thereto in another way and preferably can be locked there.

When drilling with the drill, the drill bit generates the propulsion in the material. The brush elements engaging thereafter convey the drill meal in the direction of the borehole, on the one hand, and loosen the drill dust from the borehole wall on the other hand. Outside the borehole can be a vacuum cleaner can be arranged, which sucks the Bohrmehl. For this purpose, a suction head adapter is preferably provided, which is attached to the suction hose of the nipple and through which the drill extends in order to fully suck the drilling dust out of the borehole.

In a third variant, the drill consists of at least two components: a drill bit with subsequent attachment means and a shaft with optional detachable brush elements. The drill bit can be fastened to the shaft by means of the fastening means, for example screwed on. Brush elements can be mounted in or on the shaft (for example in the manner of a tongue and groove connection). The latching means can also be realized by means of a hole and a knob instead of a tongue and groove. Preferably, the brush elements each form a circumferential spiral to efficiently convey the drill meal out of the wellbore.

In a fourth variant, an annular groove can be provided in the tip of the drill into which a ring with brush elements can be interchangeably inserted. Upon reaching the desired wellbore depth, the drill bit is axially reciprocated to release the drilling dust from the wellbore, with the drilling dust extraction continuing. Optionally, the drill may be rotated slightly to assist brushing.

Optionally, the drill bit projects radially beyond the shaft to locate the brush elements therein.

Fig. 1 to Fig. 6 13 show different views of a drilling assembly 150 and a substrate 102 to be drilled during a method of drilling and cleaning a wellbore 200 and subsequently anchoring an anchoring member 600 in the drilled wellbore 200 in accordance with an exemplary embodiment of the invention.

In Fig. 1 is the drilling assembly 150 for drilling and cleaning the in Fig. 2 shown borehole 200 in a concrete wall as a substrate 102 according to an exemplary embodiment of the invention. The drilling arrangement 150 has a drill 100, which will be described in more detail below. The drill 100 is according to Fig. 1 received by a drill 152. More specifically, a chuck of the drill 152 rotatably receives a free end of a shank portion 110 of the drill 100 so as to rotationally drive the drill 100 by driving the drill 152. This is in Fig. 1 schematized with a rotation arrow 130.

The drill 100 is designed to drill and clean the borehole 200 in the substrate 102. It has an end drill section 104 with a drill bit 114 and adjoining drill edges 106 for removing material from the substrate 102. The drill section 104 is configured to remove concrete material from the substrate 102 to form drill cuttings for drilling the wellbore 200. The drilling section 104 is adjoined immediately by the shank section 110 which has been designed in the described exemplary embodiment, from which part of its lateral surface with flexible metal bristles 112 protruding radially beyond its solid core for brushing the borehole 200 by means of removing drilled mortar 202 from the borehole 200 Is provided.

In order to remove drilling dust 202 resulting from drilling during a drilling process described in more detail below and / or during a cleaning process described in more detail below from the borehole 200, the drilling assembly 150 further comprises a suction device 118. This cooperates with the drill 100 and with an auxiliary body 120. The auxiliary body 120, which is substantially shaped, for example, like a pack of cigarettes, is placed on the wall 102 prior to drilling the borehole 200 and optionally fixed there. In the auxiliary body 120, a first receiving opening 122 for receiving the drill 100 from an external position to a surface of the substrate 102 to be drilled is formed. An appropriate insertion direction is in Fig. 1 schematized with an arrow 132. Further, in the auxiliary body 120, a second receiving opening 124 connected to the first receiving opening 122 is formed is designed to operatively connect the suction device 118 with the borehole 200 to be drilled. In other words, by rotationally driving the drill 100 by means of the drill 152, the borehole 200 can be formed in the substrate 102, producing concrete drilling meal. This is sucked through a portion of the first receiving opening 122 and through the second receiving opening 124 of the suction device 118 and into a in Fig. 1 Not shown container disposed of, so that an operator is safely protected from the potentially harmful debris 202.

Fig. 1 now shows the drilling assembly 150 in a state just before the rotary driven drill 100 is inserted into the first receiving opening 122 to start drilling the borehole 200 after contacting the surface of the substrate 102.

Fig. 2 FIG. 12 shows the drilling assembly 150 in a later state in which the tip 114 of the drill 100 has reached the lowest depth of the well corresponding to a predetermined target depth and therefore the wellbore 200 is fully formed. Drilling dust 202 located in the borehole 200 is extracted by means of the suction device 118, wherein a suction direction is indicated by an arrow 208. The flexible or resilient metal bristles 112, as they project radially beyond the core of the drill 100, are forcefully pressed against the borehole wall of the borehole 200 along their full circumferential extent.

Although the suction device 118 removes a significant portion of the drilling dust 202 during drilling, residual drilling dust 202 may still remain on the borehole wall.

Fig. 3 FIG. 12 shows the drilling assembly 150 in a still later state in which, by merely retracting the drill 100 from the wellbore 200, the wellbore wall of the wellbore 200 is cleaned of remaining debris 202 by the metal brushes 112. The retraction of the drill 100 is in Fig. 3 schematized with an arrow 300. By retracting, the metal bristles 112 vividly grind along the borehole wall and pull therefore remaining debris 202 out of the wellbore 200. This cleaning of the borehole wall can be additionally supported by the suction device 118.

However, the drill 100 remains in place during the retraction according to Fig. 3 in the rotating state, it can be additionally reinforced by the cleaning effect of the then rotating metal bristles 112.

As an alternative to the described mode of operation, however, the drive of the drill 152 and / or the suction device 118 can also be switched off.

Optionally, by one or more pulls back and forth of the drill 100 (with or without drive or rotation of the drill 100) between the operating conditions according to Fig. 2 and Fig. 3 the cleaning of the well 200 can be further improved.

Fig. 4 shows the remaining and cleaned wellbore 200 in the subsurface 102 after the drilling assembly 100 has been completely removed.

The wellbore 200 thus cleaned may then be used in combination with a chemical dowel to receive and anchor an anchoring element 600 to the substrate 102. This is in Fig. 5 and Fig. 6 and will be described in more detail below.

According to Fig. 5 For example, a suitable amount of a curable curing material 502 is introduced into the borehole 200 with a metering device 500.

The following will, as in Fig. 6 shown, the anchoring element 600 introduced into the partially filled wellbore 200 and the hardenable curing material 502 then cured. Since the wellbore 200 has been cleanly cleared of debris 202 by virtue of the combination of the suction device 118 and the bristles 112 attached to the drill 100, the anchoring force of the chemical anchor is in Fig. 6 extraordinarily high.

Fig. 7 10 shows a drill 100 according to another exemplary embodiment of the invention having annular and radially outwardly extending metal bristles 112 as wellbore cleaning elements for drilling and cleaning a wellbore 200.

In the drill 100 according to Fig. 7 For example, the shaft portion 110 has helical coils 700 running parallel to one another, between each of which a recess 704 is formed. The drilling dust 202 produced during the drilling operation can be discharged outward along the recesses 704 if drilling dust is extracted during drilling by means of a suction device 118 and / or by means of the metal bristles 112 drilling dust 202 is removed from the borehole wall. A free end of the shank portion 110 forms a clamping portion 706 for clamping the drill 100 into a chuck of a drill 152.

The metal bristles 112 are attached to a circumferential brush member 702 provided separately from the shaft portion 110. The brush member 702 has as shown in more detail in FIG Fig. 9 is shown, a rubber ring 900, on the outer circumference, the metal bristles 112 are immobilized pointing radially outward. Fig. 8 shows a front portion of the drill 100 according to Fig. 7 with an annular groove 800 for receiving the in Fig. 9 The ring member 702 can thus be mounted on the shaft portion 110 by the elastic rubber ring 900 is positively received in the annular groove 800. The length of the metal bristles 112 is sized to project radially, for example, 1 mm to 3 mm beyond the bore portion 104 when the ring 900 is received in the annular groove 800.

In the drill 100 according to Fig. 7 is thus the shaft portion 110, as in Fig. 8 shown, provided with the annular groove 800. The metal bristles 112 are pointing radially outward at the in Fig. 9 shown elastic rubber ring 900 is attached. By inserting the rubber ring 900 into the annular groove 800, the metal bristles 112 on the shaft portion 110 and thus on the drill 100 fixable. This configuration allows a fully annular hole cleaning. In addition, a simple replacement of the metal bristles 112 is possible, since after wear thereof only the ring 900 with the metal bristles 112 attached thereto needs to be replaced. Due to the positioning of the ring 900 at the front end of the shank portion 110, that is, directly adjacent to the drill portion 104, in addition, a cleaning already starting in the deep hole area is made possible. By retracting the drill 100 from the wellbore 200 after forming the wellbore 200, the ring 900 located in the wellbore region travels a long way to the wellbore, effectively cleaning a large surface area of the wellbore wall.

Fig. 10 shows a front portion of a drill 100 according to another exemplary embodiment of the invention with a formed between two axially spaced annular ribs 1002 on the shaft portion 110 annular recess 1000 for receiving the in Fig. 9 shown ring 900 with the radially arranged metal bristles 112. Fig. 10 shows that for receiving the ring 900 on the shank portion 110 substantially any fastening means can be formed, which preferably form-fitting receive the ring 900 and prevent release of the ring 900 of the fastening means at the forces incurred during the drilling or cleaning forces.

Fig. 11 to Fig. 15 show drills 100 with well cleaning elements 112 in accordance with other exemplary embodiments of the invention.

At the in Fig. 11 shown drill 100, the entire shaft portion 110 is covered with metal bristles 112 or other brush elements. This will be according to Fig. 11 accomplished thereby, that in this case a cylindrical or tubular tube 1100 is pulled over the shaft portion 110 and holds there preferably non-positively. On an outer side of the tube 1100, directed radially outwards in a ring shape, the metal bristles 112 are attached. A rear surface 1102 of a drill bit formed, for example, as a diamond segment as a drill section 104 serves as a stop for the front end of the tube 1100. The tube 1100 can be made of plastic, rubber or metal or be designed as a fabric. It can have any desired contour and should be configured to be able to fasten brush elements on the outside.

As with all embodiments of the invention can also according to Fig. 11 either the shank portion 110 and the drill portion 104 may be integrally provided, or the shank portion 110 and the drill portion 104 may be formed as separate but interconnectable (eg, screw-together) components.

At an in Fig. 12 according to another exemplary embodiment of the invention, the well cleaning elements are mounted as metal bristles 112 on an outer surface of a helical coil 700 of the shaft portion 110. The drill meal 202 may then be removed along depressions 704 between adjacent coils 702 along a helical trajectory.

At an in Fig. 13 according to another exemplary embodiment of the invention, the well cleaning elements are mounted as metal bristles 112 in recesses 704 between adjacent helical coils 700 of the shaft portion 110. Thus, the brush elements 112 may be accommodated protected from excessive mechanical stress in interspaces between drill coils 700.

Fig. 14 shows a drill 100 according to yet another exemplary embodiment of the invention, in which as a hole cleaning elements rubber blades 112 are partially mounted circumferentially on the shaft portion 110 and around it. For this purpose, for example, 700 longitudinal grooves can be formed on the helices, in which the rubber blades 112 inserted and optionally glued or clamped.

In Fig. 15 For example, a drill 100 according to another exemplary embodiment of the invention is shown in which, similar to FIG Fig. 11 a tube 1100 is overlapped with externally attached metal bristles 112. According to Fig. 15 For example, the tube 1100 is attached to a portion of the shaft portion 110 in which coils 700 and recesses 704 interposed therebetween are formed. A rear end portion 1500 of the drill 100 associated with a drill bit (not shown) is free of coils 700, depressions 704, and tube 1100.

Fig. 16 and Fig. 17 show assemblies 150 including a drill 100 having well cleaning elements 112 and a debris removal device 118 for drilling and cleaning a wellbore 200 in accordance with exemplary embodiments of the invention.

According to Fig. 16 a plurality of axially and radially spaced-apart surface regions of the shaft portion 110 are provided with metal bristles 112. The distances or spaces between the metal bristles 112 allow for the extraction of drill dust irrespective of the presence of the metal bristles 112 during the drilling operation by means of the drilling dust extraction device 118.

According to Fig. 17 For example, an assembly 150 with a drill 100 according to another exemplary embodiment is shown. Similar to in FIGS. 7 to 10 In an annular groove 800 at a front end of the shaft portion 110, a ring 900 is inserted with outwardly projecting metal bristles 112 for cleaning the borehole 200. According to this embodiment, the suction device 118 is now integrated in the drill 152. In the embodiment shown, an exit hole 1702 is formed in a front portion of the drill 100, which is connected to a Bohrmehlkanal 1700 inside the drill 100. A back end of the drilling mud channel 1700 is coupled to the suction device 118 via a hose 1706 or the like for sucking away debris 202 during the drilling operation.

The suction device 118 sucks already during the drilling of the borehole 200 by means of the drill section 104 of the drill 100 formed drilling dust 202 through the outlet opening 1702, the Bohrmehlkanal 1700 and the tube 1706 from. Upon completion of drilling, due to the provision of the metal bristles 112, mere extraction of the drill 100 from the wellbore 200 results in additional cleaning of the wellbore wall without the need for a separate cleaning device from the drill 100.

Further shows Fig. 17 in that the shank portion 110 tapers conically towards the borehole exterior. As a result, a dynamic reinforcement effect can be achieved during the suction of the drilling dust 202, with which the well cleaning can be further improved.

Drills according to exemplary embodiments of the invention can be used, for example, for drilling into a solid material, such as concrete or sand-lime brick. However, it is also possible to use drills according to exemplary embodiments for hollow bricks in which the webs are large and the chambers are small, so that a large part of the volume accounts for the webs.

In addition, it should be understood that "no other elements or steps are excluded and" a "or" an "are not meant to exclude a plurality." Further, it should be understood that features or steps described with reference to any of the above embodiments are also incorporated in Combination with other features or steps of other embodiments described above may be used, and reference signs in the claims are not intended to be limiting.

Claims (15)

1. A drill bit (100) for drilling and cleaning a borehole (200) in a substructure (102), particularly concrete, wherein the drill bit (100) features:

   a terminal drilling section (104) for removing material from the substructure (102) and thereby producing cuttings (202) in order to drill the borehole (200);

   a shaft section (110) that is arranged adjacent to the drilling section (104) and provided with flexible borehole cleaning elements (112), which at least sectionally protrude radially over the drilling section (104), in order to remove at least part of the cuttings (202) from the borehole (200);

   characterized in that

   the drill bit (100) contains a hollow channel (1700) with a front outlet opening (1702) on the drilling section (104) and a rear outlet opening, particularly on the shaft section (110), wherein the rear outlet opening is coupled or can be coupled to a suction device (118), which is designed for extracting the cuttings (202) from the borehole (200) by suction, preferably during the drilling process and/or during the cleaning process.
2. The drill bit (100) according to claim 1, wherein the drilling section (104) features a drill tip (114) with drilling edges (106) arranged adjacent thereto for removing material from the substructure (102), particularly in a percussive fashion.
3. The drill bit (100) according to claim 1 or 2, wherein the borehole cleaning elements (112) feature bristles, particularly metallic bristles, which collectively form a brush.
4. The drill bit (100) according to one of claims 1-3, wherein the borehole cleaning elements (112) feature fins, particularly plastic fins.
5. The drill bit (100) according to one of claims 1-4, wherein the borehole cleaning elements (112) are arranged such that they extend around the shaft section (110) in a helicoidal fashion.
6. The drill bit (100) according to claim 5, wherein the shaft section (110) features at least one helicoidal spiral (700), wherein at least some of the borehole cleaning elements (112) are arranged such that they extend around the shaft section in a helicoidal fashion, particularly on at least one of the at least one spiral (700) .
7. The drill bit (100) according to claim 5 or 6, wherein the shaft section (110) features at least two helicoidal spirals (700), wherein at least some of the borehole cleaning elements (112) are arranged such that they extend around the shaft section in a helicoidal fashion, particularly in or between two adjacent spirals (700).
8. The drill bit (100) according to one of claims 1-7, featuring at least one of the following characteristics:

   the drill bit (100) features a sleeve (1100), particularly an elastic sleeve, which can be placed over the shaft section (110), wherein the inner side of said elastic sleeve can be fixed on the shaft section (110) and its outer side is provided with the borehole cleaning elements (112);

   the shaft section (110) and the borehole cleaning elements (112) are realized in one piece, particularly together with the drilling section (104);

   the entire surface of the shaft section (110) is provided with borehole cleaning elements (112);

   the shaft section (110) is tapered in the direction of the borehole exterior starting from the drilling section (104);

   the borehole cleaning elements (112) are designed such that they can be removed from the shaft section (110) and therefore exchanged;

   the shaft section (110) and the borehole cleaning elements (112) feature cooperating fastening devices for being fastened on one another, particularly in a form-fitting fashion;

   the shaft section (110) features an annular groove (800) and the borehole cleaning elements feature bristles (112), which are radially attached to a ring (900), particularly an elastic ring, wherein the ring (900) can be fastened or is fastened on the shaft section (110) by being inserted into the annular groove (800);

   the borehole cleaning elements (112) are configured in the form of several borehole cleaning element groups, which are spaced apart from one another and not interconnected.
9. A drilling arrangement (150) for drilling and cleaning a borehole (200) in a substructure (102), wherein the drilling arrangement (150) features:

   a drill bit (100) according to one of claims 1-8 for drilling and cleaning a borehole (200) in the substructure (102), particularly concrete;

   a drill (152) for receiving the shaft section (110) of the drill bit (100) and for rotationally driving the drill bit (100);

   a suction device (118) for extracting cuttings (202) from the borehole (200) by suction during the drilling process and/or during the cleaning process.
10. The drilling arrangement (150) according to claim 9, featuring an auxiliary body (120) for being placed on the substructure (102), wherein the auxiliary body (120) is provided with a drill bit receptacle opening (122), through which the drill bit (100) extends to the substructure (102), and with a suction receptacle opening (124), which is preferably connected to the drill receptacle opening (122), in order to functionally connect the suction device (118) to the borehole (200) to be drilled.
11. A method for drilling and cleaning a borehole (200) in a substructure (102), wherein the method features the steps of:

    drilling the borehole (200) with a drill bit (100) according to one of claims 1-8 by removing material from the substructure (102) and thereby producing cuttings (202) by means of the terminal drilling section (104) of the drill bit (100);

    removing at least part of the cuttings (202) from the borehole (200) by means of the flexible borehole cleaning elements (112), which radially protrude over the drilling section (104) and are at least sectionally attached to the shaft section (110) of the drill bit (100) arranged adjacent to the drilling section (104);

    wherein the cuttings (202) are during at least part of the method extracted from the borehole (200) by suction.
12. The method according to claim 11, wherein the borehole (200) is cleaned during part of the method by axially and/or radially moving the borehole cleaning elements (112) along the borehole (200) and thereby removing cuttings (202) without drilling.
13. The method according to claim 11 or 12, wherein the borehole (200) is drilled to a nominal depth, particularly to a maximum borehole depth, and the drill bit (100) is after reaching the nominal depth moved in the direction of the borehole opening (300) starting from the nominal depth at least once, particularly several times, in order to at least partially remove the cuttings (202) from the borehole (200).
14. The method according to claim 13, wherein the drill bit (100) rotates during the movement.
15. A utilization of a drill bit (100) according to one of claims 1-8 or of a drilling arrangement (150) according to one of claims 9 or 10 for drilling a borehole (200) and for at least partially removing cuttings (202) from the borehole (200) by means of the borehole cleaning elements (112).

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