Controllable drilling head

Abstract

Controllable drilling head The invention relates to a controllable drilling head for a drill string for drilling soil with a drilling head tip and a receiving rod, which supports the drilling head tip, in which the drilling head tip has a bore extending obliquely to the longitudinal axis and the receiving rod has an inclination to the longitudinal axis and in which the drilling head tip can be rotated on the receiving rod and the drilling head tip and the receiving rod are arranged, for straight-line drilling, in a first angular position relative to each other and the drilling head tip and the receiving rod are arranged, for drilling deviating from straight-line drilling, in a second angular position relative to each other. Figure to be published with the abstract: Fig. 3

Description

Title of the invention: Controllable drilling head

[0001] The present invention relates to a controllable drilling head for a drill string for drilling soil, a drilling device and a method for controlling a drilling head on a drill string for drilling soil.

[0002] In principle, when drilling the ground, it is necessary to guide the drill string located in the ground to a specific destination or to move it along a desired path. Particularly for horizontal drilling, the precision of the destination of the drill string, which is sometimes used in densely built areas with many infrastructures, especially in the subsoil, plays an important role. A destination pit, often narrowly defined, must be reached with the drill string with great precision in order to lay a channel, a pipe or a cable in the ground at a desired position or to be able to bring the drill string out at a specific point from the surface.

[0003] For drilling devices in which the drill string is introduced into the ground by pushing, it is known to use a permanently asymmetrical advance head, for example chamfered, for a constant directional movement during advancement. For a straight-line movement, the entire drill string or advance head is rotated, which causes an oscillating, but generally straight-line, drilling movement of the drilling device. In order to maintain the constant rotation of the advance head or drill string, a mechanical device is usually provided, which is arranged outside the borehole and which causes the permanent rotation.The permanently asymmetrical feed head and its permanent rotation allow control of the drill string, but require considerable construction and mechanical effort, because, in addition to the drive for advancing the drill string in the thrust direction, a drive for rotation as well as corresponding elements transmitting the rotational force must be provided.

[0004] Based on the state of the art, the aim of the invention is to create, for ground drilling, based on a rod, a controllable drilling head, a drilling device as well as a method for controlling a drilling head on a drilling column for ground drilling, which are designed economically and simply, which can be handled simply and / or which allow a simple construction.

[0005] This objective is achieved by means of a controllable drilling head for a drilling column for drilling soil, with a drilling head tip and a housing rod, which supports the drilling head tip, the drilling head tip comprising a bore extending obliquely to the longitudinal axis and the receiving rod having an inclination to the longitudinal axis and the drilling head tip rotatable on the receiving rod and the drilling head tip and the receiving rod being arranged, for straight-line drilling, in a first angular position relative to each other, and the drilling head tip and the receiving rod being arranged, for drilling deviating from straight-line drilling, in a second angular position relative to each other.

[0006] The invention also relates to: • a drilling device with a drilling head mentioned above and a drive which can be arranged in a pit or well, by means of which a drilling column with the drilling head can be driven in a pushing or pulling manner; • a method for controlling a drilling head on a drill string for drilling soil, the drilling head comprising a drilling head tip and a receiving rod, which supports the drilling head tip, the drilling head tip having a bore extending obliquely to the longitudinal axis and the receiving rod having an inclination to the longitudinal axis and the drilling head tip and the receiving rod being designed to be rotatable relative to each other and being brought relative to each other, for straight-line drilling, into a first angular position and the bore and the receiving rod being brought, for drilling deviating from straight-line drilling, into a second angular position relative to each other.

[0007] The idea of ​​the invention is to use a controllable drilling head with a drilling head tip that does not have to perform any permanent movement for straight-line movement. Instead, in addition to the absence of a permanent movement of the drilling head tip, a simple construction is provided, in which the drilling head tip has a bore inclined with respect to the longitudinal axis, which is designed for receiving a receiving rod. The drilling head tip is placed on the receiving rod, which also has an inclination with respect to its longitudinal axis. The drilling head tip and the receiving rod can rotate relative to each other. It is provided here that the inclined components can balance each other in a first angular position so as to enable straight-line movement of the drilling head tip.In a second angular position of the drill head tip and the housing rod between them, the inclinations can add up, more particularly completely, so that the drill head tip can adopt an inclined position relative to the longitudinal axis of the drill string, which can correspond. more particularly to the sum of the inclinations. This enables a trajectory correction by means of the rotary drill head tip relative to the receiving rod. This prevents a permanent rotation of an asymmetrical drill head tip outwards; an asymmetry in the form of an inclination of a bore respectively of a bore extending obliquely to the longitudinal axis is "displaced" inwards of the drill head tip. Since in particular (only) two angular positions of the drill head tip relative to the receiving rod can be provided, the first angular position can be used for straight-line drilling and the second angular position can be used for trajectory correction.Since the housing rod does not have to be moved continuously for straight-line movement, the rotation of the housing rod for trajectory correction can be carried out, in particular manually, only over a short period of time. In particular, a marking can be provided on the circumference at the drill rod and / or the drive, on the outside, which indicates the angular position of the rod and thus the relative position of the drill head tip to the housing rod. This avoids a costly rotary drive requiring high drive powers. This can result in the advantage for the user that, even for a simple and / or small drilling device, efficient control is possible.

[0008] The invention provides a controllable drilling head for a drill string for drilling soil with a drilling head tip and a receiving rod that supports the drilling head tip. The drilling head tip comprises a bore extending obliquely to the longitudinal axis. The receiving rod has an inclination to the longitudinal axis. The drilling head tip can be rotated on the receiving rod, such that the drilling head tip and the receiving rod are designed to rotate relative to each other. For straight-line drilling, the drilling head tip and the receiving rod can be arranged in a first angular position relative to each other. For drilling deviating from straight-line drilling, the drilling head tip and the receiving rod are arranged in a second angular position relative to each other.

[0009] The term "drilling column", within the meaning of the description, comprises a column, comprising a drilling head and a rod, which can be moved in the ground for carrying out a drilling in the ground by means of a drilling device respectively a driving device.

[0010] The term "rod", as used in the description, includes not only exclusively rigid rods comprising individual rod sections connected to each other directly or indirectly, which can be used in a device for drilling. In a preferred embodiment, the rod sections are rigid. For connecting the rod sections to each other and for forming the drill string, a plug-in connection of the individual components of the drill string is preferably provided. A rotationally fixed connection of the rod sections and the drill string components is preferred.

[0011] The term "rod section" within the meaning of the description comprises an element extending along a longitudinal axis, which is part of the rod or the drill string for drilling soil. The rod section can be designed as an element arranged at the front in the drill string with a corresponding function (transmitter housing or the like) or as an element extending (only mechanically) the drill string as a rod section. The rod section can comprise mechanical channels, for example for a drilling fluid, electrical lines, electrical elements and / or electronic elements.

[0012] A rod section, within the meaning of the description, may have an outer diameter of 25 mm to 65 mm, preferably 30 mm to 60 mm, preferably 35 mm to 55 mm, preferably 40 mm to 50 mm. A rod section, within the meaning of the description, may have a total length of 450 mm to 650 mm, preferably 500 mm to 600 mm, preferably 520 mm to 580 mm. A rod section within the meaning of the description may have a useful length which takes into account in particular the length of the connecting elements, arranged in particular at the end, for example, for a plug-in connection, a length of the connecting socket and / or the connecting connector. The useful length may represent the total length reduced by the length of the connecting element(s) and be 400 mm to 600 mm, preferably 450 mm to 550 mm, preferably 475 mm to 525 mm.A rod section within the meaning of the description may have a groove for the insertion of a fitting element for moving the drill string, for example a (locking) ratchet, which may have an outer diameter of 15 mm to 55 mm, preferably 20 mm to 50 mm, preferably 25 mm to 45 mm, preferably 30 mm to 40 mm. In a particularly preferred embodiment, the total length of the rod section may be 550 mm and the outer diameter of the rod section may be 45 mm. The useful length of a rod section may be 500 mm. The outer diameter of a groove for the insertion of a fitting element for moving the drill string may have an outer diameter of 35 mm.The values ​​given for the outer diameter of the rod section, the (total) length of the rod section, the usable length of the rod section and the outer diameter of a groove on the rod section are not limiting values ​​for the dimensions; it should be noted that adaptation to external conditions, more . particularly the size of the pit respectively the well for the arrangement of the drilling device and / or the nature of the soil, can be carried out in order to carry out drilling efficiently.

[0013] More particularly, a rod section and / or the drilling head within the meaning of the description may be designed, at the ends, for the formation of at least one plug-in connection. At one end, the rod section and / or the drilling head may comprise (a) a connecting connector with an external contour or (b) a connecting socket with an internal contour. The external contour or the internal contour may have, in cross-section, a shape other than a circular shape.

[0014] Insofar as it is described that at one end of the rod section a connecting connector or a connecting socket is provided, it can be provided that on one and the same rod section a connecting connector is present at one end and a connecting socket is present at the other end. The formation of a plug-in connection at both ends of one and the same rod section is possible, the outer contour respectively the inner contour having, in cross-section, a shape other than a circular shape. However, it is also possible that a rod section according to the present invention has a connecting connector with the previously described outer contour or a connecting socket with the previously described outer contour only at one end, the other end being able to be designed in any way.A design of a rod section for which only one end includes a connecting connector or a connecting socket with a contour as described allows a configuration for changing to another connecting system.

[0015] The term "cross-section" within the meaning of the description includes a cross-section relative to the longitudinal axis of the respective element in question in the region of the plug-in connection, i.e. for the rod section or the drive element in the end portion of the rod section or the drive element, which is provided for connection with the element to be connected. Preferably, the cross-section is viewed at an angle of 90° to the longitudinal axis. Small deviations from the right angle to the longitudinal axis are possible.

[0016] A rod section within the meaning of the description may comprise, at one end, a connection connector and, at the other end, a connection sleeve. This allows for simple connection when the rod sections are in a determined orientation. The inner contour and the outer contour of the connection sleeve respectively of the connection connector may be oriented relative to each other in a predetermined angular position, such that the respective contours at both ends of the rod section are aligned with each other or are oriented so that they can be plugged into each other. It may also be provided that the rod section has, at the end, plug-in elements of the same shape, such that the rod section comprises, for example, at both ends, a connection connector or, at both ends, a connection socket, which may have the respective described contour.

[0017] For the purposes of the description, a "shape other than a circular shape" is any geometric shape that is not a circular shape. The shape other than a circular shape therefore does not only contain points of a plane (the cross-section in question) that have a constant distance from a specific point of this plane (center). It is possible for the shape other than a circular shape to have, at least in some places, straight lines. The shape may, in addition or alternatively, have curved lines respectively curved. As described below, the shape other than a circular shape may also have a known shape, which can be named in a simple manner.

[0018] The shape different from a circular shape may be an oval shape, more particularly a convex rounded figure, the figure being able, in a specific case, to be an ellipse. The shape different from a circular shape may be an elliptical shape. For the purposes of the description, by ellipse is meant a closed oval curve which can be represented as a conic section. Usually, an ellipse is a shape with points for which the sum of the distances of a point from two predetermined points, so-called foci, is the same for all points. Usually, in an ellipse, the straight line passing through the foci of the ellipse is called the major axis and the straight line orthogonal to it passing through the center of the ellipse is called the minor axis.

[0019] It can be provided that the shape, in particular oval, which is in particular designed in the form of an ellipse, is designed in such a way that the shape has no symmetry, which allows the connection connector and the connection socket to be plugged into only one angular position relative to each other.

[0020] The expression "drilling device", within the meaning of the description, includes any device which can move in the ground, in particular a drilling column comprising rod sections, in an existing channel or to be dug, in order to create or widen a borehole, more particularly a horizontal borehole, or in order to lay pipes or other long bodies in the ground. The drilling device can be arranged in a pit or a well, more particularly a pipeline manhole. More In particular, the drilling device is designed for a push-type or pressure-type driving of the drill string into the ground. An additional pull-type operation can also be provided, in which the drill string and / or a pipe can be pulled into the ground after the push-type driving, in particular to a destination pit.

[0021] The term "horizontal drilling", within the meaning of the description, includes, more particularly, any type of existing or to be created channels, preferably horizontal, in a body, more particularly channels made in the ground, including boreholes in the ground, boreholes in the rock or pipes in the ground as well as underground or open-air pipes and water pipes, which can be made, widened or laid using a corresponding drilling device.

[0022] The term "accommodating rod" includes a body designed, at least in some places, in the form of a rod, which is located in particular at the end of the body, and onto which another body, more particularly the drill head tip, can be plugged. The accommodation rod can be arranged generally centrally with respect to the cross-section. The inclination of the accommodation rod can extend with a predetermined inclination angle from the central arrangement.

[0023] The term "drill head tip", as used in the description, includes a body which is the front end of the drill string. The drill head tip can be considered as the first element of the drill string. The drill head tip can be exposed and, as the first component of the drill string, first come into contact with the ground when drilling into the ground by pushing. The drill head tip can have an outer contour which can be entirely symmetrical. The outer circumference and shape of the drill head tip can have, with respect to a center line, not only a mirror symmetry with respect to a section, but more particularly a point symmetry. This makes it possible to implement the basic idea of ​​the invention in a simple manner. An outward symmetry, which requires permanent rotation, is preferably not provided.

[0024] Since it is described that the drill head tip can be rotated relative to the receiving rod, a direct plugging of the drill head tip onto the receiving rod may be preferred. However, it may also be provided that between the receiving rod and the drill head tip there is an intermediate element for an indirect connection.

[0025] In a preferred embodiment, the axis of a portion of the bore in the drill head tip, into which in particular the housing rod can be introduced, forms an angle with the longitudinal axis of the drill head tip of 1° to 20°, preferably from 2° to 15°, preferably from 3° to 13°, preferably from 3° to 10°, preferably from 4° to 10°, preferably from 4° to 8°. In a particularly preferred embodiment, an angle of a portion of the bore with the longitudinal axis of the drill head tip is 5°. More particularly, it may be provided that the bore extends from an opening made centrally in the drill head tip, with the above-mentioned angle, towards the drill head tip.

[0026] In a preferred embodiment, the inclination of the housing rod forms an angle of 1° to 20° with the longitudinal axis of the housing rod. Preferably the inclination of the housing rod may form an angle of 2° to 15°, more preferably 3° to 13°, more preferably 3° to 10°, more preferably 4° to 10°, more preferably 4° to 8°, with the longitudinal axis of the housing rod. In a particularly preferred embodiment, the inclination of the housing rod forms an angle of 5° with the longitudinal axis of the housing rod. Adjusting an angle concretely makes it possible to refer to the extent of the "trajectory correction" and an angle can be chosen, which can be adapted to a drilling.

[0027] In a preferred embodiment, the drill head tip has a diameter of less than 70 mm, preferably less than 65 mm, preferably less than 60 mm. In a particularly preferred embodiment, the drill head tip has an outer diameter of 55 mm. For smaller uses, i.e. for carrying out shorter or finer boreholes, correspondingly suitable diameters can be selected. The drill head tip can, alternatively or additionally, be adapted to the size of the drilling device and / or to the nature of the soil in which the borehole is to be carried out. In addition to an adaptation of an outer diameter, the drill head tip can be adapted, with regard to its geometry, to the nature of the soil respectively of the material surrounding the borehole.

[0028] In a preferred embodiment, the housing rod is at least partially surrounded by a wear sleeve, so that a receptacle for the housing rod is located, more particularly at the end, in the region of the longitudinal axis, which is aligned with the drill string when the drill head is part of the drill string. Only the wear sleeve needs to be replaced when the drill string has been used many times. The more complex production of the housing rod can be repelled by the provision of a wear sleeve. The wear sleeve can be part of an adapter for integrating the controllable drill head into the front of a drill string. The adapter can comprise, at its end opposite the housing rod, a connecting portion with which the adapter can be mounted on a rod section of a drill string. The housing rod can be fixed in a rotationally fixed manner, 。 in traction and thrust in the adapter in the wear sleeve by means of a transverse rod.

[0029] In a preferred embodiment, the outer circumference of the receiving rod, which can come into contact with the inner contour of the bore of the drill head tip, or the inner contour of the bore of the drill head tip, which can come into contact with the outer contour of the receiving rod, is limited by two stop surfaces or comprises these. The two stop surfaces are spaced apart from each other in the longitudinal direction of the drill head tip or the receiving rod. In both angular positions, one of the stop surfaces of the drill head tip can each bear against a stop surface of the receiving rod. The stop surfaces can form end positions of a relative rotational movement of the receiving rod in the bore. This makes it possible to adjust two concrete angular positions of the drill head tip relative to the receiving rod.The angular positions can be precisely adjusted and the displacement of the drill head tip relative to the drill column can be precisely used to control the drill head.

[0030] In a preferred embodiment, the two stop surfaces are arranged relative to each other in such a way that a rotation angle greater than 45° between the drill head tip and the housing rod can cause a change from the first angular position to the second angular position. This ensures that the two angular positions can be deliberately adjusted relative to each other and that a necessary rotational movement between the two angular positions is large enough to deliberately control one of the two angular positions.Preferably, the angle formed between the two abutment surfaces may be > 50°, more preferably > 60°, more preferably > 70°, more preferably > 80°, more preferably > 90°, more preferably > 100°, more preferably > 110°, more preferably > 120°, more preferably > 130°, more preferably > 140°, more preferably > 150°, more preferably > 160°, more preferably > 170°, more preferably 180°. In a particularly preferred embodiment, the two abutment surfaces are parallel to each other.

[0031] The invention also provides a drilling device with a described controllable drilling head and a drive which can be arranged in a pit, by means of which a drilling column with the drilling head can be driven in a pushing or pulling manner, more particularly in a pushing manner.

[0032] In a preferred embodiment, at the ends, on a rod section of the drill string, a socket is provided for a tool for rotating the rod section about its longitudinal direction. This makes it possible to obtain a design simple in which the drill string can be rotated about its longitudinal axis in order to rotate the housing rod. The housing rod can be rotated relative to the drill head tip and a corresponding angular position can be adjusted.

[0033] In a preferred embodiment, a scale is provided in the region of the drive, by means of which a value of a rotation of the stop surfaces about the longitudinal axis of the receiving rod or the bore can be displayed. The scale can refer to a marking on the rod sections.

[0034] The invention also provides a method for controlling a drill head on a drill string for drilling soil. The drill head comprises a drill head tip and a housing rod that supports the drill head tip. The drill head tip comprises a bore extending obliquely to the longitudinal axis and the housing rod has an inclination to the longitudinal axis. The drill head tip and the housing rod are designed to be rotatable relative to each other. For straight-line drilling, the drill head tip and the housing rod can be brought into a first angular position relative to each other. For drilling deviating from straight-line drilling, the drill head tip and the housing rod can be brought into a second angular position relative to each other.

[0035] The embodiments relating to the different aspects of the invention, as described in particular for the controllable drilling head and the method, are to be considered as complementary embodiments. The embodiments relating to one aspect are also valid for the embodiments relating to one of the other aspects.

[0036] The encrypted information, within the meaning of the description, is information which may have a tolerance of ± 10%, so that the encrypted information does not only define a value but an interval of values, in order to take into account in particular the tolerance intervals which may be due to manufacturing.

[0037] The present embodiments therefore do not constitute, just like the following description of embodiments by way of examples, a waiver of specific embodiments or characteristics.

[0038] The invention is explained in more detail below using an exemplary embodiment shown in the figures.

[0039] The figures show:

[0040] [Fig-1] a drilling device with parts of a drill string in isometric representation;

[0041] [Fig.2] A section through a front portion of a drill string with a drill head drilling in a first angular position;

[0042] [Fig.3] the front part of the drilling column with the drilling head of [Fig.2] in a second angular position; and

[0043] [Fig.4] an enlarged representation of [Fig.l] in the region of the drive of the drilling device.

[0044] [Fig.l] shows a drilling device 1, which can be clamped by means of supports 2 arranged on the frame in a pit not shown.

[0045] With the aid of a fitting element designed as a locking pawl 4, which is attached to a carriage 50, which can move relative to the frame with a reciprocating movement, a drill string can be pushed or pulled into the ground. The locking pawl 4 engages in one of the grooves 5 of a rod section 6. The hydraulic cylinder 3 is acted upon and the locking pawl 4 is moved accordingly, so that the drill string can be pushed into the ground. During the return stroke of the hydraulic cylinder 3, the locking pawl 4 pivots out of a groove 5, in order to fall into the next groove 5 when this is reached. Another feed cycle can then be started.

[0046] The stress on the hydraulic cylinder 3 can be controlled from a control panel 28. The control panel 28 comprises a pressure display 27, in order to give information concerning the pressure and the adjustment by means of a hydraulic valve 26 and to carry out the latter.

[0047] [Fig. 2] shows a section through a drilling head 7, by means of which the direction of the drill string can be controlled. The drill head 7 is shown in a state in which the drill head can be inserted in a straight line. A drill head tip 9 arranged in front of the drill head 7 constitutes, with regard to its outer contour, an extension of the drill string. There is no angle between the drill head tip 9 of the drill head 7 and the longitudinal axis of the drill string.

[0048] The drilling head tip 9 of the drilling head 7 has a bore 10 inclined by 5° relative to the longitudinal axis XX, which is designed in part of its length so as not to be round over its entire circumference. By means of the bore 10 the drilling head tip 9 can be plugged onto a receiving rod 13 and is mounted on the receiving rod 13 in a rotatable manner relative thereto. The receiving rod 13 can be rotated relative to the drilling head tip 9. By means of safety bolts (not shown), which can engage in a counterbore 12, the drilling head tip is secured to the receiving rod 13 in the axial longitudinal direction. The housing rod 13 also has, in the embodiment shown, an inclination of 5° relative to the longitudinal axis XX, so that the housing rod 13 forms, at the front, an inclination relative to the part 17 of the housing rod 13, which is aligned with the longitudinal axis of the drill string.

[0049] In the position shown in [Fig. 2], the inclinations of the bore 10 of the drilling head tip 9 and the receiving rod 13 are in an identical angular position superimposed, so that the angular deviations of 5° each time compensate each other. The drilling head tip 9 is therefore in an angular position respectively a position which is suitable for straight-line drilling.

[0050] The receiving rod 13 is guided at its rear end in an adapter 14 and is connected thereto in a rotationally, tensilely and thrustly fixed manner via a transverse rod 15. The transverse rod 15 is secured by a wear sleeve 16 which is itself connected in a rotationally and form-fitting manner to the receiving rod 13 in a region at the front. The wear sleeve 16 serves as an interchangeable wear protection.

[0051] The adapter 14 comprises, at the rear end, an elliptical bore 18, in order to be coupled to a first drill rod of also elliptical shape. In the embodiment shown in [Fig. 2], a plug-in connection, which is secured by means of a rod, is provided for connection with the rod section.

[0052] For depth measurement in the open air and for position determination, a transmitter 19 is mounted in the adapter 14, which transmitter sends electromagnetic waves to a receiving device, in order to be able to determine the current depth and / or position of the drilling head 7. On the adapter 14, at the transmitter 19, transmitter slots 20 are formed through which the electromagnetic waves can exit.

[0053] In [Fig. 2], which represents the first angular position for straight-line drilling, the bore 10 has a stop surface or a stop edge 11, against which a stop surface or a stop edge 24 of the housing rod 13 bears.

[0054] [Fig. 3] shows the drilling head 7 described in more detail with [Fig. 2], in a position respectively a (second) angular position which is designed to give the drilling path a curved trajectory in order, for example, to carry out corrections to the drilling path and thus to reach a predefined target. The receiving rod 13, which comprises, in a part 23 of its length, in addition to the first stop surface or stop edge 24, a second stop edge 24, is rotated relative to the drilling head tip 9, the ground holding the drilling head tip 9 in position. The housing rod 13 thus comes, with its second stop edge 24, against the stop edge 11 of the bore 10 of the drill head tip 9. The stop edges 11, 24 allow the entire drill string, including the drill head tip 9, to be able to rotate in the direction desired to perform a trajectory correction. The inclinations of 5° each are added to an inclination of the drill head tip 9 up to 10° in total, which is shown in [Fig. 3]. The inclinations of the bore 10 of the drill head tip 9 and the housing rod 13 are brought into angular positions opposite to the position shown in [Fig. 2].

[0055] The rotation of the housing rod 13 is achieved by the fact that a rotary adapter 21, with a ratchet 22, shown enlarged in [Fig. 4], is mounted on the rear rod section 6, which is to be pushed. A clockwise rotation of 180°, provided in the exemplary embodiment, of the entire drill string as well as the components connected thereto in a rotationally fixed manner, as described above with the adapter 14, the housing rod 13 and the wear sleeve 16, makes it possible to rotate the entire drill string, the drill head tip 9 being prevented from rotating by the surrounding ground.

[0056] In order to facilitate the control process respectively the guidance of the receiving rod 13 for the operator a scale 25 in the form of a time display or a roll angle is mounted on the rotary adapter 21. After a successful control process, i.e. after carrying out a trajectory correction with a corresponding displacement of the drill string by driving into the ground, the drill head tip 9 of the illustrated embodiment can be returned, by a rotation to the left by 180° of the entire drill string, to a straight-line movement, as shown in [Fig. 2], the receiving rod 13 being turned and the drill head tip 9 also being prevented from rotating by the ground.

Claims

Claims

1. Controllable drilling head (7) for a drilling column for drilling with a drilling head tip and a receiving rod (13), which supports the drilling head tip (9), in which the receiving rod (13) has an inclination relative to the longitudinal axis, and in which the drilling head tip (9) and the receiving rod (13) are arranged, for straight-line drilling, in a first angular position relative to each other and the drilling head tip (9) and the receiving rod (13) are arranged, for drilling deviating from straight-line drilling, in a second angular position relative to each other, controllable drilling head (7) characterized in that the drilling head tip (9) has a bore (10) extending obliquely to the longitudinal axis, in that the drilling head tip (9) can be rotated on the housing rod (13),and in that the housing rod (13) comprises two stop surfaces (11, 24) or the bore (10) is delimited by two stop surfaces (11, 24), the two stop surfaces (11, 24) being spaced apart from each other in the longitudinal direction of the drill head tip (9) respectively of the housing rod (13) and the stop surfaces (11, 24) constituting end positions of a relative rotational movement of the housing rod (13) in the bore (10).,

2. Controllable drilling head (7) according to claim 1, wherein the axis of a portion of the bore (8) forms an angle of 5° with the longitudinal axis of the drilling head tip (9) and / or the inclination of the housing rod (13) forms an angle of 5° with the longitudinal axis of the housing rod (13).

3. A controllable drill head (7) according to claim 1 or 2, wherein the drill head tip (9) has a diameter of less than 70 mm.

4. Controllable drilling head (7) according to one of claims 1 to 3, wherein the housing rod (13) is at least partially surrounded by a wear sleeve (16), more particularly as part of an adapter (14).

5. Controllable drilling head (7) according to claim 1, in which the two abutment surfaces (11, 24) form between them an angle greater than 45°.

6. Drilling device (1) with a controllable drilling head (7) according to one of claims 1 to 5 and a drive which can be arranged in a pit or shaft, by means of which a drilling column with the drilling head (7) can be driven in a pushing or pulling manner.

7. Drilling device (1) according to claim 6, wherein at the ends, on a rod section (6) of the drill string, a socket is provided for a tool for rotating the rod section (6) about its longitudinal direction.

8. Drilling device (1) according to claim 6 or 7, wherein in the region of the drive a scale (25) is provided, by means of which a value of a rotation of the stop surfaces around the longitudinal axis of the receiving rod (13) or the bore (7) can be displayed.

9. Method for controlling a drilling head (7) on a drilling column for drilling soil, wherein the drilling head (7) comprises a drilling head tip (9) and a receiving rod (13), which supports the drilling head tip (9), wherein the drilling head tip (9) comprises a bore (10) extending obliquely to the longitudinal axis and the receiving rod (13) has an inclination to the longitudinal axis and the drilling head tip (9) and the receiving rod (13) are designed to be rotatable relative to each other and are brought, for straight-line drilling, into a first angular position relative to each other and the bore (10) and the receiving rod (13) are brought, for drilling deviating from straight-line drilling, into a second angular position relative to each other relative to each other, and wherein the housing rod (13) comprises two abutment surfaces (11,24) or the bore (10) is delimited by two stop surfaces (11, 24), the two stop surfaces (11, 24) being spaced apart from each other in the longitudinal direction of the drill head tip (9) respectively of the receiving rod (13) and the stop surfaces (11, 24) constituting end positions of a relative rotational movement of the receiving rod (13) in the bore (10).,

Images