Abstract
A drill string section of a drill string for drilling in the ground having arranged on the outside of the drill string section at least one marking by means of which abrasion can be recognized.
Claims
1. A drill string section of a drill string for drilling in the ground, wherein on the outside of the drill string section there is arranged at least one marking by means of which abrasion can be recognized.
2. The drill string section according to claim 1, wherein the drill string section is a housing of a percussion drilling device for drilling in the ground, in which a main piston is arranged for a reciprocating motion.
3. The drill string section according to claim 1, wherein multiple markings are arranged on the drill string section, by means of which abrasion can be recognized.
4. The drill string section according to claim 3, wherein the markings have a different configuration.
5. The drill string section according to claim 3, wherein the markings have a different depth radial to the lengthwise axis of the drill string section.
6. The drill string section according to claim 3, wherein the markings have different widths in the direction of the lengthwise axis (X) of the drill string section.
7. The drill string section according to claim 5, wherein the depths of the multiple markings in the direction radial to the lengthwise axis (X) of the drill string section are chosen such that different degrees of abrasion are identifiable.
8. The drill string section according to claim 3, wherein the markings extend entirely around the circumference of the drill string section.
9. The drill string section according to claim 1, wherein the marking is a spiral in the circumferential direction of the drill string section.
10. The drill string section according to claim 3, wherein the markings are arranged spaced apart from each other on several regions of the drill string section.
11. The drill string section according to claim 1, wherein the marking is rounded in the lengthwise extension radially to the lengthwise axis (X) of the drill string section.
12. A ground drilling device having a drill string section of a drill string for drilling in the ground, wherein on the outside of the drill string section there is arranged at least one marking by means of which abrasion can be recognized, wherein the at lest one marking is rounded in the lengthwise extension radially to the lengthwise axis (X) of the drill string section, and wherein a drive unit is configured to introduce a drill string comprising the drill string section into the ground.
13. A method comprising using a drill string section of a drill string for drilling in the ground, wherein a marking is used on the outside of the drill string section by means of which abrasion can be recognized.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0039] The invention shall be explained more closely in the following as an example with the aid of two exemplary embodiments represented in the drawings.
[0040] The drawings show:
[0041] FIG. 1 illustrates a drill string section designed as a percussion drilling device with markings;
[0042] FIG. 2 illustrates an enlarged cut-out view with markings from FIG. 1;
[0043] FIG. 3 illustrates another embodiment of a drill string section designed as a percussion drilling device with markings and
[0044] FIG. 4 illustrates an enlarged region of FIG. 3 with markings on the drill string section.
DETAILED DESCRIPTION
[0045] FIG. 1 shows a drill string section 1 configured as a percussion drilling device, having a housing 2, inside which a main piston is arranged (not visible). The main piston is supplied with pressurized air via a pressurized air hose 4, in order to execute reciprocating movement inside the housing 2. The main piston may be actuated so that it either strikes in the front region of the percussion drilling device to propel the percussion drilling device with the drill head 3 forward through the ground, or it strikes in the rear region of the percussion drilling device in order to drive it backwards. In the front region of the drill string section 1, designated as Y and shown enlarged in FIG. 2, markings 5, 6, 7 are arranged on the housing 2 of the percussion drilling device. The markings 5, 6 7 make it possible to recognize different degrees of abrasion on the housing 2. The abrasion occurring on the housing 2, increasing over time, is caused by the resistance of the ground during the course of the drilling.
[0046] FIG. 2 shows, highly enlarged, the cut-out Y from FIG. 1. Three grooves configured as depressions 7 have been machined each time in the direction of the drill head 3 and in the direction of the end 9 of the drill string section 1. These outer depressions 7 have a machining depth of 0.15 mm. In later use, whether during the advancement or during the backward operation of the drill string section 1 designed as a percussion drilling device, the material on the outside of the housing 2 is worn away by abrasion so much that at first the depressions 7 are hardly or not at all recognizable. This indicates the start of the wear on the drill string section 1 or the housing 2 and it enables a first estimation as to when the housing 2 needs to be replaced, insofar as it is worn down. In turn, each time further spaced away from the drill head 3 and from the end 9 of the percussion drilling device than the already described three depressions 7, there are arranged three depressions 6. These three depressions 6 have been machined with a depth of 0.3 mm. After continuing use and thus continuing wear on the housing 2 of the percussion drilling device, the material ablation on the housing 2 has proceeded to such an extent that the three depressions 6 are also hardly or not at all recognizable. This means already an intense wear on the housing 2, however the further use of the drill string section 1 designed as a percussion drilling device is still possible. However, it may be assumed that the housing 2 will have to be replaced within a short time. The preparations needed for this may now be made already. In the middle between the aforementioned depressions 6, 7 there are arranged a further three depressions 5. These three depressions 5 are 0.5 mm deep. If, in the further course of the use of the drill string section 1 designed as a percussion drilling device, the further material ablation occurs to such an extent that these deeper three depressions 5 are also hardly or not at all recognizable, at least the housing 2 must be replaced, or else there will occur a fracturing of the housing 2 and thus a total loss of the percussion drilling device in the ground and naturally also a failure of the drilling project. All of the aforementioned depressions 5, 6, 7 have a radius 8 in order to prevent a premature fracturing of the housing 2 due to the notch effect at the depressions 5, 6, 7.
[0047] FIG. 3 shows as an example another possible embodiment of the markings 5, 6, 7 for the recognition of wear on a housing 2. In this embodiment, instead of encircling depressions 5, 6, 7, there are machined groove-like depressions 10, 11, 12 of different depth in the housing 2, extending only across a partial region of the circumference.
[0048] FIG. 4 shows a highly enlarged representation of the cut-out Z of FIG. 3. The depressions 10 here play the role of the three depressions 7 of FIG. 1. The depressions 11 are analogous to the three depressions 6 of FIG. 1 and the depression 12 indicates, like the three depressions 5 of FIG. 1, the need to replace the housing 2. The depressions 10, 11, 12 are likewise provided with radii 8 in order to avoid a notch effect.
