EP2781682A1 - Small drilling device - Google Patents

Abstract

The?small drilling apparatus (2) has a main carrier (4) and a telescopic mast (7) with an adjustable length. A rotating device (6) is provided for pivotably coupling the telescopic mast to the main carrier around a vertical axis (A1). The telescopic mast is configured to accommodate drill rods with a length from 0.5 m to 2.5 m.

Description

The invention relates to a mobile drill for producing holes in the ground.

From the DE 36 25 577 A1 is a small drilling rig for making holes in the ground known. The small drilling rig has a drilling mast on which a drilling carriage is guided vertically, a feed device releasably connected to the drilling carriage, a drilling drive, a rope winch with rope and a cable guide via a deflection device at the upper end of the drilling mast.

From the DE 1 483 853 A1 is a drill with an adjustable in its inclination or angular position held mast and drive means for a drilling tool or a drill pipe known.

From the product brochure "KR 702-1" the company Klemm Bohrtechnik a small drilling rig is known, which has a telescopic drilling mast.

In particular, in confined spaces, for example in rooms or corridors, which are limited by their room width or room height, there are difficulties in the implementation of Erdbohrungen. To adjust the drill pipe length to the room height, it may be necessary to replace the drilling mast, which means a considerable conversion effort.

On this basis, the present invention seeks to propose a small drill, the variable adaptation to different Space conditions such as passage width or room height possible without retooling.

The solution consists in a small drill for producing holes in the ground, comprising: a main carrier, a telescopic mast with an adjustable length, and a rotating device with which the telescopic mast is pivotable relative to the main carrier about a vertical axis of rotation (A1).

The advantage is that a drill attached to the telescopic mast can be quickly brought to different drilling positions due to the combination of telescoping and pivoting of the mast about a vertical axis. In particular, holes can thus be produced close to building walls with the small drill without the need to move the drill itself for this purpose. By telescoping the mast longer drill string elements can be used, so that the setup time and thus the drilling time can be reduced overall.

With small drill means that this has relatively compact dimensions, so that it can be used in confined spaces. In particular, the dimensions of the small drill are chosen so that it can be moved by standard size doors. Preferably, the small drill in beigeklappter position of the individual modules has a maximum width of 760 mm and a maximum height of 1900 mm. Thus, the device is suitable for use in buildings, for example for the production of foundation underpinnings. For this purpose, the drill is moved into the building to the desired position. It then drills through the foundation of the building and drills a hole in the underlying soil. Thereafter, a curable suspension can be introduced through the drill pipe into the soil. According to a preferred embodiment, the small drill is designed as a mobile device, that is, it has a vehicle with its own drive for locomotion.

According to a preferred embodiment, the length of the telescopic mast is so infinitely adjustable that drill pipe with a length of 0.5 m to particular 2.5 m can be recorded, with other lengths are also conceivable in principle. To produce holes having a depth greater than the length of the drill string, a plurality of drill string members are connected together and sunk one after the other until the desired total depth is achieved.

The telescopic mast is rotatable relative to the main girder, starting from a central position, about the vertical axis of rotation over an angular range of up to ± 90 °. In the center position of the telescopic mast is located substantially in the center plane of the drill, while the telescopic mast is moved in the pivoted position out of the center plane. For vertically aligned telescopic mast, the distance of the rotary axis of the rotary head to the vertical pivot axis is greater than the largest half width of the drill. In this way, can also create holes laterally adjacent to the drill in pivoted about the vertical axis position of the telescopic mast. A conversion of the drill is not required for this.

According to a preferred embodiment, the rotating device, which may also be referred to as the first pivoting device, a rotary member and a rotary drive, with which the rotary member relative to the main carrier is rotatably driven. The rotary drive can be designed in the form of a hydraulic rotary transmission, with which the rotary member can be rotated from a central position clockwise or counterclockwise. In this case, the telescopic mast is pivoted clockwise when turning to the right, and when turning counterclockwise to the left side of the drill. The rotating part carries the telescopic mast, which is why it can also be referred to as a supporting element. For this purpose, the rotary member may have a flange-like plate, protrude from the two cheek-like holding parts on which further support elements are supported or stored for the mast.

Preferably, a tilting device is provided with which the telescopic mast is pivotable about a horizontal tilting axis (A2). The tilting device is also referred to as the second pivoting device and the tilting axis as the second pivoting axis. The tilting device is mounted on the rotating device so that the former rotates together with the latter around the vertical axis. The connection is preferably made via a bearing, via which a tilting part of the tilting device with the Rotary part of the rotating device is mounted pivotably about the horizontal axis. The tilting device further comprises a tilting drive, which is supported relative to the rotary part and serves to pivot the tilting part.

According to a preferred embodiment, a third pivoting device is further provided, with which the telescopic mast about a third pivot axis (A3) is pivotable, said third pivot axis is perpendicular to the tilt axis. The third pivot axis is formed by a pivot bearing on the tilting part, that is, when pivoting the tilting part, the third pivot axis is tilted together with this.

By using three swiveling devices, the telescopic mast can be swiveled by a total of three axes (A1, A2, A3). In this way, holes can be produced with any orientation or the drilling tool can be brought into position without having to move the vehicle. Preferably, the pivoting device has a carrier element, which is rotatably mounted relative to the tilting element about the third pivot axis, and a pivot drive which is supported relative to the tilting element and serves to pivot the carrier element. On the support element of the telescopic mast is attached.

With the tilting device of the telescopic mast can be pivoted or tilted from a substantially horizontal rest position in which the mast rests on the device in an example vertical working position. The tilting device preferably comprises a hydraulic cylinder as a drive, which is arranged opposite the tilting bearing at a distance, in order to generate a rotational torque about the tilting axis when actuated. The hydraulic cylinder is preferably connected via an articulated intermediate element pivotally connected to the rotary member of the rotating device. In this case, a first joint allows a tilting movement of the hydraulic cylinder when tilting the mast about the tilting axis, while a second joint allows pivotal movement of the hydraulic cylinder during lateral pivoting of the mast. With its second end of the hydraulic cylinder is pivotally mounted on the support member for the telescopic mast.

Preferably, the rotary drive for the rotating device, the tilting drive for the tilting device and / or the pivoting drive for the pivoting device are hydraulically actuated, and in particular comprise one or more hydraulic cylinders.

According to a preferred embodiment of the telescopic mast comprises a first mast part and a second mast part telescopic therefor, wherein a first hydraulic cylinder is provided for moving the second mast part relative to the first mast part. After a favorable development, a slide with a rotary head for driving a drill string is attached to the telescopic mast part, wherein the carriage along the telescopic mast part by means of a second hydraulic cylinder is movable. In particular, the first hydraulic cylinder for moving the telescopic mast part and the second hydraulic cylinder for moving the carriage are designed so that they can be moved at the same feed speed. This is advantageous for precise control of the drilling speed as well as the pulling speed, so that a hole can be drilled at a uniform feed rate and a suspension can be injected evenly into the ground.

Preferably, the drill comprises a self-propelled undercarriage, in particular with a crawler or track undercarriage. The chassis is spreadable in a preferred embodiment in width, each side of the chassis can be separately expanded. Due to the spreadability results in improved support and increased stability when driving.

On the main carrier, which is mounted on the chassis, support elements are hinged, which can be folded out before the drilling operation and ensure a secure state of the main carrier during drilling and good support. Preferably, the front support elements are each separately controlled and extendable via a hydraulic cylinder. The two rear support elements are preferably actuated or extendable via a respective hydraulic cylinder. These hydraulic cylinders are connected to each other via a hydraulic line, so that automatically a hydraulic compensation in the two Hydraulic cylinders adjusts. This prevents the small drill from lifting off one side during uneven ground conditions during the supporting process.

Figur 1

ein erfindungsgemäßes Kleinbohrgerät zur Herstellung von Bohrungen im Erdreich,

1. a) in einer ersten Seitenansicht
2. b) in einer Vorderansicht
3. c) in einer zweiten Seitenansicht
4. d) in einer rückwärtigen Ansicht
5. e) in Draufsicht;

Figur 2

das Kleinbohrgerät gemäß Figur 1 in Seitenansicht mit um die horizontale Kippachse (A2) teilweise gekipptem Teleskopmast;

Figur 3

das Kleinbohrgerät gemäß Figur 1 in Arbeitsstellung mit um etwa 90° um die Kippachse (A2) gekipptem Teleskopmast,

1. a) in Seitenansicht,
2. b) in Frontansicht,
3. c) in Draufsicht;

Figur 4

das Kleinbohrgerät gemäß Figur 3 in Arbeitsstellung mit um die Drehachse (A1) um etwa 90° verschwenktem Teleskopmast,

1. a) in Seitenansicht,
2. b) in Vorderansicht,
3. c) in Draufsicht;

Figur 5

das Kleinbohrgerät gemäß Figur 3 in Vorderansicht mit um die Schwenkachse (A3) um etwa 30° verschwenktem Teleskopmast;

Figur 6

das Kleinbohrgerät gemäß Figur 3 mit ausgefahrenem Teleskopmast,

1. a) in Seitenansicht,
2. b) in Vorderansicht, und

Figur 7

das Kleinbohrgerät gemäß Figur 6 mit um die Schwenkachse (A3) um etwa 30° verschwenktem Teleskopmast.

Preferred embodiments will be explained below with reference to the drawing figures. Herein shows

FIG. 1

an inventive small drill for the production of bores in the ground,

1. a) in a first side view
2. b) in a front view
3. c) in a second side view
4. d) in a rear view
5. e) in plan view;

FIG. 2

the small drill according to FIG. 1 in side view with the horizontal tilting axis (A2) partially tilted telescopic mast;

FIG. 3

the small drill according to FIG. 1 in working position with telescopic mast tilted about 90 ° about the tilt axis (A2),

1. a) in side view,
2. b) in front view,
3. c) in plan view;

FIG. 4

the small drill according to FIG. 3 in working position with telescopic mast pivoted about 90 ° about the axis of rotation (A1),

1. a) in side view,
2. b) in front view,
3. c) in plan view;

FIG. 5

the small drill according to FIG. 3 in front view with about the pivot axis (A3) about 30 ° pivoted telescopic mast;

FIG. 6

the small drill according to FIG. 3 with extended telescopic mast,

1. a) in side view,
2. b) in front view, and

FIG. 7

the small drill according to FIG. 6 with about the pivot axis (A3) pivoted by about 30 ° telescopic mast.

The FIGS. 1a) to 1e ), which will be described together below, show a small drill 2 for the production of holes in the ground. Under small drill is understood in this context that this can pass through standard-sized doors, in particular, it is provided that the machine width in folded state of the individual machine elements is greater than or equal to 760 mm and the maximum height is about 1900 mm. In this way, the passage of the small drill 2 is ensured by a door opening, so that it is particularly suitable for the production of underground foundations in buildings below the building foundation.

The small drill 2 comprises a movable undercarriage 3 with a crawler track. On the undercarriage 3, a main support 4 is mounted, which can be supported over a total of four pivotable about vertical axes and adjustable in height supporting elements 5, 5 'relative to a stationary floor. It is provided that the front support elements 5 are controlled separately, without hydraulic compensation with each other. In contrast, the rear support members 5 'are hydraulically connected to each other, so that they are together extendable and retractable.

On the main carrier 4, a rotating device 6 is further mounted, with which the telescopic mast 7 relative to the main carrier 4 is pivotable about a vertical axis A1. Furthermore, a control cabinet 8 and a measuring system 9 are recognizable. The small-scale drilling apparatus further comprises measuring devices 10, such as a manometer or hydraulic measuring devices for the actuators, as well as measuring devices for suspensions optionally to be injected into the bore.

The telescopic mast 7 is adjustable in length and has for this purpose a first mast part 11 and a longitudinally displaceable relative thereto second mast part 12. On the second mast part 12, a carriage 13 is longitudinally movably secured to which a rotary head 14 is mounted for receiving and driving a drill string , and in the extent also can be referred to as a drill head. The length L7 of the telescopic mast 7 is infinitely adjustable so that drill pipe can be taken with a length of 0.5 m to a maximum of 2.0 m.

FIG. 2 shows the small drill 2 from FIG. 1a ), wherein the telescopic mast 7 is pivoted relative to the main carrier 4 by means of a tilting device 15 about a tilt axis A2 by an angle ß of about 35 ° relative to the horizontal starting position. The tilting device 15 is pivotally connected to a component of the rotating device 6 and supported on this. The rotating device 6 comprises a rotary drive 21, which is designed in particular in the form of a hydraulic rotary transmission. By means of the rotary drive 21, the suspension of the mast 7 can be pivoted about the vertical axis A1. For this purpose, the rotary device 6 comprises a rotary element 17, which is designed in the manner of a flange and is connected by means of a multiplicity of screw connections 18 to an underlying, rotatably drivable base body. The rotary member 17 has a base plate on which two cheek-like holding parts 19, 19 'are attached. The two holding parts 19, 19 'are spaced from each other and take a first bearing 20 for pivotally supporting a portion of the tilting device 15 and a second bearing 22 for pivotally supporting a tilting element 23 of the tilting device 15.

The tilting device 15 further comprises a tilting drive 16, which is designed in the form of a hydraulic cylinder, wherein other tilting drives are not excluded. The hydraulic cylinder 16 is pivotally mounted via an intermediate element 24 pivotally about two axes C1, C2 relative to the rotary member 17. In this case, the bearing 20 allows a pivoting movement about an axis parallel to the horizontal axis A2 axis C1, while a second hinge 25 allows a pivoting movement about a second axis C2, which is perpendicular to the axis C1. The upper end of the hydraulic cylinder 16 is pivotally mounted via a further joint 26 about a pivot axis C3 to a support member 27 to which the mast 7 is attached.

The tilting movement is accomplished by extending the hydraulic cylinder 16. Characterized in that the two bearing points C1 and C3 are spaced from the tilting axis A2, a torque is generated by the extension of the hydraulic cylinder 16 about the tilting axis A2, which leads to an erection of the support member 27 and the associated telescopic mast 7. In the righting movement, the hydraulic cylinder 16 pivots about the upper and lower bearings 20, 26. The bearing 20 of the hydraulic cylinder 16 and the bearing point 22 of the tilting member 23 are both located on the rotary member 17, on different sides with respect to the vertical axis A1. Overall, the rotating device 6, the tilting device 15 and the carrier element 27 connected thereto form a common structural unit, which has only one connection point with respect to the underframe, namely the rotary device.

The carrier element 27 is pivotably mounted relative to the tilting element 23 by means of a pivoting device 28 about a pivot axis A3. The pivot axis A3, which runs perpendicular to the horizontal tilting axis A2, is formed by a pivot bearing 36 between the carrier element 27 and the tilting element 23. For pivoting the carrier element 27 about the bearing 36, a pivot drive 29 is provided, which in the present case comprises a hydraulic cylinder. The hydraulic cylinder 29 is supported at a first end on the tilting element 23 and pivotally mounted relative to this at a bearing point 30. The second end of the hydraulic cylinder 29 is mounted on the support member 27 by means of a bearing 32 and supported against it. By an extension movement of the hydraulic cylinder 29, the support member 27 is moved relative to the tilting member 23 in the clockwise direction. By retracting the hydraulic cylinder 29 is, inversely, the support member 27 is moved in the opposite direction of rotation.

The pivoting movement is accomplished by extending the hydraulic cylinder 29. Characterized in that the two bearing points 30, 32 are spaced from the pivot axis A3, is generated by retraction or extension of the hydraulic cylinder 29, a torque about the pivot axis A3, resulting in a pivoting of the support member 27 and the associated telescopic mast 7. at the extension movement of the hydraulic cylinder 29, the support member 27, viewed in the direction of travel of the drill, pivoted clockwise; when retracting counterclockwise. The point of application of the bearing 30 is arranged on a radial projection on the pivoting element 23. The pivot axis A3 is perpendicular to the tilt axis A2, and that - in the vertical working position of the telescopic mast 7 - with a small distance top of the tilt axis A2. In the case of an untwisted turning device (α = 0 °), the tilting axis A2 is arranged between the pivoting plane, which is formed by the pivoting bearing 36 between the tilting element 23 and the carrier element 27, and the axis of rotation A1.

On the support member 27, the first mast part 11 is held longitudinally displaceable via a guide 31. To move the mast part 11, or the telescopic mast 7, relative to the carrier element 27, an actuator 34 is provided, which is attached to the upper part of the mast part 11 and is supported with a lower end relative to the support member 27. At the first mast part 11, the telescopic second mast part 12 is longitudinally displaceable, which in turn carries the carriage 13 for the rotary head 14. The two mast elements 11, 12 are designed as a supporting profile.

The FIGS. 3a) to 3c ), which will be described together below, show the small drill 2 in a working position in which the tilting member 23 and with this the support member 27 and the mast 7 is pivoted about the tilt axis A2 by an angle ß of 90 ° from the horizontal. In this position, the mast 7 has a vertical orientation. The carriage 13 has moved to an upper position, so that a drill pipe 33 (shown in dashed lines) can be accommodated in the rotary head 14. In FIG. 3a ) is at the upper end of the first mast part 11 of the actuator 34 can be seen, with which the first mast part 11 relative to the support member 27 can be moved longitudinally. The actuator 34 is designed in the form of a hydraulic cylinder, which can also be referred to as a mast displacement cylinder. For guiding between the support member 27 and the mast 11 corresponding guide rails 31 are provided, in which the base mast is guided laterally.

In Figure 3c ) Further details of the small drill 2 can be seen. Here, the rotary member 17 can be seen in plan view, which can be rotated by the hydraulic rotary drive 16 about the vertical axis A1. The two chain drives 35, 35 'are laterally spreadable, so that there is good stability when driving. The radius between the vertical axis A1 and the drilling axis F is greater than half the width of the crawler chassis in the spread state. In this way, holes can be laterally adjacent to the small drill 2 produce. Furthermore, the support elements 5 can be seen, which ensure good stability during the drilling process and which support the forces introduced by the telescopic mast 7 into the base frame 4 relative to the stationary base. Thus, the suspension is not affected by these forces.

The FIGS. 4a) to 4c ), which will be described jointly below, show the drill 2 in a relation to the in Figure 3c ) shown position of the telescopic mast 7 by an angle a of 90 ° clockwise pivoted position. The largest distance of the support element 5 located on the same side to the center plane M of the small drill corresponds approximately to the radius R of the telescopic mast or of the attached carriage including the turret. Due to the pivotability of the telescopic mast 7 about the vertical axis A1, a special flexibility with regard to the arrangement of bores to be produced is achieved. In particular, holes can be made close to building walls without having to move the drill. Overall, this results in shorter processing times.

The comparison of Figure 4c ) with the Figure 3c ) shows that the main carrier 4 is also telescopic. A first carrier part 40 can be seen, with respect to which a second carrier part 41, on which the rotary element 17 is fastened, is held in an axially displaceable manner. For this purpose, corresponding guides and an actuator are provided between the first carrier part 40 and the second carrier part 41. Due to the displaceability of the support member 41 and the thus firmly connected rotary member 17, the latter can be brought into a position in which the vertical axis A1 is arranged at a distance from the driving value. In this way, for the telescopic mast 7 together with slide 13 and rotary head 14 allows a large pivoting range α of up to ± 90 ° with respect to the vehicle center plane M.

FIG. 5 shows the drill according to FIG. 3b in a view from the front, with respect to the vertical Grundposistion by an angle γγ pivoted telescopic mast 7. The pivot angle γ is about 30 °, that is, the mast longitudinal axis and the rotational axis F of the rotary head 14 close with a vertical axis an angle γ of about 30 °. In this pivot position can also produce obliquely directed holes. The pivoting movement is accomplished by the pivoting device 28, by an extension movement of the hydraulic cylinder 29, which on the one hand and on the tilting element 23 on the other hand supported or supported on the support member 27. It is understood that any smaller but also larger angle γ can be taken as the 30 ° shown.

The FIGS. 6a) and 6b ) will be described together below. They show the drill 2 in a position corresponding to the FIGS. 3a) and 3b ), in contrast to these of the telescopic mast 7 in the present case moved to the highest position. For this purpose, a first actuator 37 is provided in the form of a hydraulic cylinder, whose lower end is supported or supported on the first mast part 11 and whose upper end is supported or supported on the second mast part 12. From the hydraulic cylinder 37, the piston rod 38 can be seen, which is attached at the upper end of the telescopic mast 12 via a hinge 39. On the movable mast element 12 of the carriage 13 is also moved to the highest position. This is done via a second hydraulic cylinder, not shown, whose one end is supported on the mast part 12 and whose second end is connected to the carriage 13 and which is received in the telescopic mast part 12. It is provided that the first hydraulic cylinder 37 and the second hydraulic cylinder for moving the carriage 13 are designed so that they can be moved at the same feed speed. In this way, when drilling the drilling and pulling the drill string results in a constant speed in the movement between the two mast parts 11, 12 on the one hand and between the telescopic mast 12 and the carriage 13 on the other. In this way, regardless of the actuation of a first or second Hydraulic cylinder achieved a constant Bohrvorschub and a uniform entry of suspension in the ground.

FIG. 7 shows the drill 2 in a front view, according to the in FIG. 6b ) view. In FIG. 5 is the telescopic mast 7 viewed from the vertical base position in the vehicle longitudinal direction in the clockwise direction rotated by an angle γ of about 30 °. That is, the mast longitudinal axis and the rotational axis F of the rotary head 14 with an vertical axis an angle γ of about 30 °. In this pivot position can also produce obliquely directed holes. The pivoting movement is accomplished by the pivoting device 28, by an extension movement of the hydraulic cylinder 29, which on the one hand and on the tilting element 23 on the other hand supported or supported on the support member 27.

LIST OF REFERENCE NUMBERS

2 drill 3 undercarriage 4 main carrier 5 support element 6 rotator 7 telescopic mast 8th switch cabinet 9 spee 10 displays 11 first mast part 12 second mast part 13 carriage 14 turret 15 tipping 16 tilt drive 17 rotating member 18 screw 19 cheek 20 camp 21 rotary drive 22 camp 23 tilt element 24 intermediate element 25 camp 26 joint 27 support element 28 swivel device 29 Rotary actuator / hydraulic cylinder 30 camp 31 guide 32 camp 33 drill pipe 34 Actuator / hydraulic cylinder 35 chassis part 36 pivot bearing 37 Actuator / hydraulic cylinder 38 piston rod 39 joint 40 first carrier part 41 second carrier part A1 vertical axis A2 tilt axis A3 swivel axis B width C1, C2, C3 axis F drilling axis H height L length M midplane R radius α angle of rotation ß tilt angle γ swivel angle

Claims (15)

Small drilling rig (2) for drilling holes in the ground, comprising: a main carrier (4), a telescopic mast (7) with an adjustable length (L7), a rotating device (6), with which the telescopic mast (7) relative to the main carrier (4) about a vertical axis (A1) is pivotable. Small drill according to claim 1,
characterized,
that the length (L7) of the telescopic mast (7) is such adjustable, that drill pipes can be accommodated with a length of 0.5 m to a maximum of 2.5 m (33). Small drill according to one of claims 1 or 2,
characterized,
that the telescopic mast (7) opposite the main support (4) about the vertical axis (A1) over an angular range (α) of up to ± 90 ° with respect to a center position is pivotable. Small boring machine according to one of claims 1 to 3,
characterized,
in that the rotary device (6) has a rotary element (17) and a rotary drive (21) with which the rotary element (17) can be driven in rotation relative to the main carrier (4) about the vertical axis (A1). Small boring machine according to one of claims 1 to 4,
characterized,
that a tilting device (15) is provided, with which the telescopic mast (7) about a horizontal tilt axis (A2) is pivotable. Small drill according to claim 5,
characterized,
in that the tilting device (15) has a tilting element (23) which is pivotably mounted relative to the rotary element (17) about the horizontal tilting axis (A2) and a tilting drive (16) which is supported relative to the rotary element (17) and for pivoting the tilting element (23) is used. Small boring machine according to one of claims 1 to 6,
characterized,
in that a pivoting device (28) is provided with which the telescopic mast (7) is pivotable about a pivot axis (A3), the pivot axis (A3) extending perpendicular to the horizontal tilting axis (A2). Small drill according to claim 7,
characterized,
in that the swiveling device (28) has a carrier element (27), which is rotatably mounted relative to the tilting element (23) about the pivot axis (A3), and a swivel drive (29), which is supported relative to the tilting element (23) and for swiveling the swivel mechanism Carrier element (27) is used. Small drill according to one of claims 5 to 8,
characterized,
in that the tilting drive (16) is pivotably mounted with a first end on the rotary element (17) and is pivotably mounted with a second end on the carrier element (27). Small boring device according to one of claims 5 to 9,
characterized,
in that the tilting drive (16) is pivotally connected to the rotary element (17) via an interposed intermediate element (24). Small boring machine according to one of claims 1 to 10,
characterized,
that at least one of the drives rotary drive (21), tilting drive (16) and pivot drive (29) is hydraulically actuated, in particular comprises a hydraulic cylinder. Small boring device according to one of claims 1 to 11,
characterized,
in that the telescopic mast (7) has a first mast part (11) and a second mast part (12) which can be telescoped for this, a first hydraulic cylinder (37) being provided for moving the second mast part (12) relative to the first mast part (11). Small drill according to one of claims 1 to 12,
characterized,
that a carriage (13) with a rotary head (14) for driving a drill string (33) is provided on the telescoping second boom member (12), said carriage (13) along the telescopic mast part (12) by means of a second hydraulic cylinder is moved. Small boring machine according to one of claims 12 or 13,
characterized,
in that the first hydraulic cylinder (37) and the second hydraulic cylinder are designed such that they can be moved at the same feed speed. Small boring device according to one of claims 1 to 14,
characterized,
that the small drill (2) has a maximum width (B2) of 760 mm and a maximum height (H2) of 1900 mm.

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