EP4110997A1 - Vorrichtung und verfahren zur drucksondierung - Google Patents
Vorrichtung und verfahren zur drucksondierungInfo
- Publication number
- EP4110997A1 EP4110997A1 EP21704789.3A EP21704789A EP4110997A1 EP 4110997 A1 EP4110997 A1 EP 4110997A1 EP 21704789 A EP21704789 A EP 21704789A EP 4110997 A1 EP4110997 A1 EP 4110997A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- probe
- rod
- probing
- pressure
- pivot bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
Definitions
- the invention relates to a device for pressure probing according to the preambles of claims 1 or 2. Furthermore, the invention relates to a Sond michsge rods according to claim 14. The invention also relates to a drill rod according to claim 15. In addition, the invention relates to a method for Carrying out pressure probes according to the preamble of claim 16.
- a well-known and frequently used method for carrying out in-situ geotechnical investigations is pressure probing such as Cone Penetration Testing (CPT), in which a probe is pressed into a subsurface. Any peak resistances (cone) and skin friction on a probe allow conclusions to be drawn about the properties, in particular the shear strength, of the subsoil or of a soil.
- CPT Cone Penetration Testing
- a probe rod is used, for example, to the lower end of which the probe can be attached.
- a cable is used within the probing rod to supply the probe with energy and to enable the data obtained to be checked during the pressure test.
- the use of an autonomous probe with its own power supply with batteries and data logger for data storage is also known.
- the autonomous probe can be used with a modem for wireless data transfer (eg acoustically) within the probe rod.
- the probe and the probing rods are pushed into the ground by an appropriate system or drive.
- This system can be designed as a special device for corresponding pressure tests.
- this system can also be, for example, a drilling system or a device for drilling holes. These systems can be installed on the subsoil or soil to be examined, for example on land or under water or on a floating platform (e.g. drilling ship).
- a drill rod such as that used for core drilling, can also be used to carry out a pressure test.
- the drill string is provided at a lower end with a drill bit which has a central opening.
- One or more scrapers are usually located above the drill bit. Flushing holes in the area of the drill bit allow the use of a flushing medium, in particular a flushing liquid or a Spülga ses, preferably air, to z. B. to stabilize the borehole and to flush out drilling cuttings from the borehole during rotary drilling.
- the sensor unit of the pressure probe is passed through the drill bit and is located below the drill string.
- the probe can either be verse with a locking unit or a support tube is used that is locked in the drill string and supports the probe during the pressure test; as described, for example, in DE 10 2018 006 176. Then the drill pipe can be pressed into the ground with the leading probe. In this case, the drill string is also used as a probe rod in the "Top Push Technique". Alternatively, the probe can be pressed into the ground with a separate drive (downhole operation).
- the use of the probe in connection with a drill string has the advantage that pressure tests and core drilling, e.g. B. for the extraction of core samples or other borehole measurements, are feasible.
- the use of special probing rods has the advantage that rods with a smaller outer diameter that are optimized for the pressure test can be used, which reduces the force required for the pressure test.
- the probing depth to be achieved in the compression test depends, in addition to the force of the drive for the pressing, in particular on the geotechnical properties of the soil. Often a high skin friction is the reason for terminating the pressure test.
- the skin friction which counteracts the driving force during the pressure test, acts on both the probe and the probing or drill rods, and therefore increases with increasing probing depth.
- Vibration can be used to achieve greater probing depths with the same drive force.
- the skin friction can be reduced during the compression test due to the vibration of the rods.
- the vibration also affects the measurements of the probe, so that the results of pressure tests carried out with or without vibration cannot be directly compared with one another.
- the rod can be turned or rotated by the drive.
- the rotation due to the rotating probe has an effect on the measured pressure measurement data, so that comparative measurements are necessary.
- the present invention is based on the object of creating a device and a method for pressure probing with which the skin friction of the rod is reduced without the probing result of the probe being influenced thereby.
- the probe at the end of the rods can be connected to the rod in a rotationally decoupled manner. Due to this rotational decoupling of the probe from the rods, in particular the probing rods or the drill rods, the entire rod system can reduce the skin friction during the Rotate the pressure test, without the probe rotating at the same time. As a result, the probe only experiences resistance parallel to the longitudinal axis of the rod. Any further friction factors or friction components that arise from an additional rotation and are laborious to calculate from the result can thereby be avoided. By rotating the probing rods, higher probing depths can be achieved than before, namely by reducing the skin friction on the rods. The skin friction on the probe is not influenced by this solution.
- a rod preferably a first probing rod of a rod, in particular a probing rod, has at least one flushing hole through which a flushing medium that is guided through the rod can be guided to the outside.
- the flushing of the rods, in particular the probing rods or the drill rods reduces the skin friction of the rods during the pressure test.
- the skin friction of the probe is not influenced by this, so that the measurement results are not influenced by this reduction in friction.
- the invention can preferably provide that a pivot bearing is arranged above a sensor system of the probe, preferably on the first probe rod or on a probe carrier, the pivot bearing being a ball bearing, cylinder bearing, barrel bearing, slide bearing or the like.
- the pivot bearing can be integrated in a probe rod of the probe rod, preferably a first probe rod directly above the probe, or directly in the probe or the probe carrier.
- the pivot bearing is a slip ring. This slip ring can have sliding contacts in order, for example, to transmit energy and / or data.
- the pivot bearing is fastened in a locking unit in a drill string, a support tube of a drill string or directly on a drill string, or can be coupled or releasably coupled.
- the pivot bearing can be used both with a probing rod and with a drill rod use flexible. Due to this flexible configuration of the device according to the invention or the pivot bearing, flexible use is possible.
- a probing rod preferably a first probing rod of the probing rod, has a drill bit and / or at least one reamer in front of the probe and in front of the pivot bearing.
- the probing rod preferably the first probing rod above the probe, has at least one flushing hole through which a flushing medium that is passed through the Sond michsge can be conducted to the outside.
- the rinsing medium which penetrates into an annular space between the probing rods and the ground to be probed, can also reduce the friction on the probing rod.
- the annulus is widened and flushed even more effectively, with the cuttings produced during the drilling process being conveyed out.
- the skin friction of the rod with the subsurface can be reduced even when using a known exploratory rod. This reduction in friction or resistance allows the probing depth to be increased further.
- the probe can be supplied with energy wirelessly via the pivot bearing, for example via sliding contacts.
- the pivot bearing exchanges data between the probe and the linkage or a control unit, which can be positioned at an upper end of the linkage, wirelessly, e.g. via sliding contacts or via an acoustic, optical or radio connection.
- This eliminates the need for a complicated and error-prone cable connection between the probe and the rods.
- a reliable energy and data transfer between the probe and a control unit above the bearing can be achieved via sliding contacts.
- no cable for energy or data transfer has to be carried in the probe string.
- an autonomous probe can be used, in which, for example, a data logger and / or an energy supply can be integrated.
- data control can be carried out in real time even when working with an autonomous probe, or wireless data can be read out immediately after use.
- a modem can be used for this, which can be positioned for data transmission in the probing line (optimally in the uppermost area of the probe installation, above the bearing). If the modem and the probe have separate energy supplies, wireless data transmission in the area of the pivot bearing is sufficient.
- the probe has its own power supply, control and data recording.
- a battery or a rechargeable battery is arranged in the probe, which provides sufficient electrical energy for the duration of the pressure probe to supply the probe or measuring devices with energy.
- a transmitter and / or a receiver, in particular a modem for the wireless transmission of the data obtained in the probing line are arranged on the probe, the support tube or the locking unit. Thanks to this wireless data transfer, the data obtained and the quality of the measurement can be assessed even in the autonomous probe operation during the probing test. This online evaluation allows the entire pressure probe to be designed particularly efficiently.
- the probe or the linkage has a sensor by means of which it can be determined whether the probe is moving relative to the linkage or is stationary.
- This sensor can be controlled via the aforementioned data transfer device or read out online.
- Another embodiment of the present invention can provide that the pivot bearing can be locked during the pressure probe, whereby a relative movement between the linkage and the probe for a comparison measurement, for example, is prevented. In this way, the effect of the skin friction on the sounding string can be examined depending on the nature of the soil. From this additional data, for example, additional properties of the ground that has been probed can be determined.
- a probe rod for solving the problem mentioned at the beginning is described by claim 14. Furthermore, a drill rod for solving the aforementioned object is claimed by claim 15.
- the probe in order to record pressure probing measurements, the probe is rotationally decoupled from a rod, in particular from a probing rod or a drill rod, as described above, and / or the rod, in particular the probing rod, is surrounded by a flushing medium.
- FIG. 1 shows a schematic representation of a system for pressure probing
- FIG. 2 shows a schematic representation of a section of a probing rod with a probe
- Fig. 3 is a schematic representation of a section of a drill string with egg ner probe
- FIG. 4 shows a schematic representation of a further exemplary embodiment of the drill rod according to FIGS. 3 and
- FIG. 5 shows a schematic representation of the probing rod according to FIG. 2 using a rinsing liquid.
- pressure probes can be carried out in a substrate 11.
- a probe 12 which is fastened or coupled to a linkage 13 is pressed into the substrate 11.
- This underground 11 can be either on land or under water.
- the linkage 13 with the probe 12 can accordingly, for example, as shown in FIG. 1, be driven into the subsurface 11 by a system 14.
- This on location 14 can for example be assigned to a vehicle 15 or, in the case of an offshore drilling, an oil rig, a ship or a robot on the sea floor.
- the probe 12 is not only pressed in the probing direction 16 parallel to a longitudinal axis of the rod 13, but also rotated or rotated around it according to the arrow direction 17 shown in FIG. 2.
- This additional Rotationsbe movement of the linkage 13 can be performed by the system 14. This rotation reduces the skin friction on a jacket of the rod assembly 13.
- this rotational movement can also have a detrimental effect on the measurement data of the pressure probing.
- a pivot bearing 18 is provided between the probe 12 and the rod 13 or integrated into the rod 13.
- the linkage 13 is designed as a probing linkage 19.
- the first probe rod 20 has the pivot bearing 18 above the probe.
- the pivot bearing 18 can, deviating from the illustration in FIG. 2, also be arranged in a different position, such as on the probe 12 above a sensor system or further above on the probing rod 19 Probing rod 19 is driven into the ground 11 in the probing direction 16, the probe 12 is thus rotationally decoupled from the probing rod 19.
- the probing rod 19 In order to reduce the skin friction of the probing rod 19 even further, it can, as shown in FIG. 2, have a drill bit 21 above the probe 12 and above the pivot bearing 18. Through this drill bit 21, a hole is drilled out after the probe 10, the diameter of which is larger than the probe rod 19. The use of a drill bit 21 is only possible if the probe rod 19 is rotatable. Contrary to the probing direction 16 of the drill bit 21 following, additional scrapers 22 are also conceivable on the Sond michsge rod 19. These scrapers 22 comminute further rock or keep an annular space 23, which is formed around the probing rod 19 during drilling, free.
- FIG. 5 shows schematically how the probing rod 19 shown in FIG. 2 is driven with the probe 12 into the ground 11. Since it is easy to see how the annular space 23 is generated by the drill bit 21. In the exemplary embodiment shown in FIG. 5, this annular space 23 is flushed out by the flushing medium. The direction of flow of the flushing medium is shown in FIG. 5 by arrows 24.
- the invention also provides that the probe 12 is rotationally decoupled from a drill rod 25 by the rotary bearing 18.
- the drill rod 25 also has a drill bit 21 for core drilling and flushing openings.
- the pivot bearing 18 is arranged between a probe carrier 26 and a locking unit 27. It is conceivable that the pivot bearing 18 is connected or coupled to the locking unit 27 or the probe carrier 26.
- the Verriege treatment unit 27 is guided to carry out the probing measurements in the drill rod 25 and locked at the lower end for the pressure measurements.
- the locking unit 27 in the drill rod 25 can be positioned or recovered.
- the probe 12 with the probe carrier 26 is rotationally decoupled from the rest of the drill rod 25 by the pivot bearing 18. In this way, as previously described for the probing rod, a pressure probing with the drill rod 25 can be carried out. As a result, the drill rod 25 can be used, on the one hand, to extract drill cores and, on the other hand, to carry out the pressure probing described.
- a further embodiment of the invention is shown.
- the probe 12 or the probe carrier 26 is supported by a support tube 29 with the locking unit 27.
- the son carrier 26 has a mandrel 31 for releasable coupling with the support tube 29.
- the probe carrier 26 can be temporarily coupled to the support tube 29 and decoupled again via this mandrel 31.
- the pivot bearing 18 can be integrated into the support tube 29 or into the locking unit 27, for example.
- the probe 12 is energy self-sufficient, that is, that it is provided, for example, with batteries or a rechargeable battery, which ensures a sufficient electrical energy supply for the operation of the probe.
- the probe 12 is supplied with electrical energy via the rotary bearing 18.
- 13 cables are passed through the linkage, via which the probe 12 can be provided with electrical energy via the pivot bearing 18.
- the probe 12 for wireless communication has appropriate transmitters and receivers in order to communicate with an external location.
- the probe 12 or the locking unit 27 has a modem 30 via which data can be exchanged with the probe 12.
- the use of a slip ring with sliding contacts is preferred for supplying the probe 12 with electrical energy and for exchanging data via the rotary bearing 18.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020001184.5A DE102020001184B4 (de) | 2020-02-24 | 2020-02-24 | Vorrichtung zur Drucksondierung |
| PCT/EP2021/053356 WO2021170415A1 (de) | 2020-02-24 | 2021-02-11 | Vorrichtung und verfahren zur drucksondierung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4110997A1 true EP4110997A1 (de) | 2023-01-04 |
Family
ID=74592016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21704789.3A Pending EP4110997A1 (de) | 2020-02-24 | 2021-02-11 | Vorrichtung und verfahren zur drucksondierung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4110997A1 (de) |
| DE (1) | DE102020001184B4 (de) |
| WO (1) | WO2021170415A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022201173A1 (de) | 2022-02-03 | 2023-08-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein | Vorrichtung und Verfahren zur Drucksondierung von Böden |
| CN115198714B (zh) * | 2022-08-16 | 2025-08-08 | 中铁上海设计院集团有限公司 | 一种用于深层土体触探测试的渐进式变径法触探测试装置 |
| CN116950028B (zh) * | 2023-06-14 | 2025-08-19 | 广州海洋地质调查局 | 一种应用于深海海底贯入探杆的锥形开孔装置及使用方法 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1603725A (en) | 1968-08-05 | 1971-05-24 | Penetrometer for exploration of under-water strata | |
| JPS60109413A (ja) * | 1983-11-18 | 1985-06-14 | Hasegawa Komuten Co Ltd | 場所打ち杭の先端支持力測定方法 |
| NL9500049A (nl) * | 1995-01-11 | 1996-08-01 | Fugro Eng Bv | Bodembeproevings- en bemonsteringssysteem. |
| US5616833A (en) | 1995-04-13 | 1997-04-01 | Andersson; Lars G. A. | Dynamic cone penetration device |
| JP3062478B2 (ja) * | 1998-08-07 | 2000-07-10 | 朝日基礎株式会社 | 掘削機 |
| JP5385771B2 (ja) * | 2009-12-15 | 2014-01-08 | 日東精工株式会社 | 貫入ロッド |
| CA2992476C (en) | 2015-07-16 | 2022-04-19 | Conocophillips Company | Downhole stinger geotechnical sampling and in situ testing tool |
| DE102018006901B4 (de) | 2018-08-07 | 2023-06-15 | Universität Bremen | Vorrichtung und Verfahren zur Durchführung geologischer Untersuchungen |
-
2020
- 2020-02-24 DE DE102020001184.5A patent/DE102020001184B4/de active Active
-
2021
- 2021-02-11 EP EP21704789.3A patent/EP4110997A1/de active Pending
- 2021-02-11 WO PCT/EP2021/053356 patent/WO2021170415A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020001184A1 (de) | 2021-08-26 |
| DE102020001184B4 (de) | 2026-01-29 |
| WO2021170415A1 (de) | 2021-09-02 |
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