Device for determining the path of a vibrating lance in the subsurface

Abstract

Device (10) for determining the course of a vibrating lance (100) in the subsoil, comprising: a housing (11) which receives at least one driven roller (12, 13) and is configured to move along the vibrating lance (100), wherein furthermore an electronic unit (19) with at least one sensor is provided which is configured to detect inclinations of the device (10).

Description

Technical field The invention relates to a device for determining the path of a vibratory lance in the subsurface. Such a vibratory lance is used in particular for creating an injection base in the subsurface. Furthermore, a system comprising such a device and a use of a device for determining the path of a vibratory lance in the subsurface is provided. State of the art Buildings and infrastructure projects in inner-city conurbations are often subject to building regulations that can only be met using so-called cut-and-cover excavations. This applies when there is a high water table and integration into a natural aquifer is not possible. Artificial seals are typically implemented using underwater concrete, injection, or jet grouting. Since underwater concrete slabs involve significant logistical effort, this design is usually not feasible, and injection and jet grouting slabs are used instead. Both types of slabs are characterized by the fact that the surface sealing effect is built up from individual elements, meaning that the exact position of the injection or jet grouting head at the planned slab depth must be known. This is achieved by surveying the injection lances or the bore of the jet grouting column. For measuring the jet blast rod, a so-called directional rod has become established, in which, through the installation of special couplings, the jet blast rod takes on the function of a chain inclinometer. This makes the drilling deviations during drilling visible. For example, DE 10 2015 200 530 A1 is known, in which a method for evaluating a jet jet column is described. In practice, the injection lances are brought to their final depth by drilling or vibrating the lances. The drilled injection lances use the directional rod to derive the additional injection volume from the evaluated borehole trajectory. However, measuring vibrated lances is technically challenging because the acceleration forces from the attached vibrator place the highest demands on the measuring technology. Tests in recent years have shown that surveying systems mounted on vibrating tubes cease to function after just a few days. The acceleration forces are so strong that the measuring equipment cannot withstand the stresses. Because of these difficulties, in practice the path of the vibrated lances is often not measured and documented, based on the assumption that the vibrating tube is stiff enough to keep possible deviations within a self-defined tolerance. Description of the invention One objective of the invention is to provide a device and a method with which the alignment of a vibrating lance in the subsurface can be reliably documented. Claim 1 provides a corresponding device. Further preferred embodiments are listed in the dependent claims. The device according to the invention has the advantage, among others, that it minimally impacts the production process and allows measurements to be taken concurrently with the vibration process. This also ensures significant time savings. The survey can take place inside a tube attached to the vibrating lance. The device can then descend into the subsurface and return to the surface independently. A device for determining the course of a vibratory lance in the subsoil is provided, comprising: a housing that accommodates at least one driven roller and is configured to move along the vibratory lance, and an electronic unit with at least one sensor configured to detect inclinations of the device. It is preferred that the electronic unit includes a component for receiving measured values ​​from the sensor (or sensors), which is configured to receive data from the sensor continuously or at intervals. According to a further embodiment, two or more rollers and a counter-pressure roller are provided, the counter-pressure roller being arranged between at least two rollers in the extension direction of the device. Thus, the counter-pressure roller can provide support for the device in the area between the rollers during operation. It is preferred that the counter-pressure roller be spring-mounted, thus providing particularly stable support for the device. The spring mounting compensates for unevenness in the running surface and ensures straight movement of the device. Furthermore, an energy storage device can be provided to supply a drive unit for at least one driven roller. This allows the device to operate autonomously, thus simplifying underground operation and handling in general. The housing can have a rectangular cross-section and would thus be adapted to a preferably also rectangular inner cross-section of a tube in which the device can be moved. Sections of the circumference of the at least one roller can be arranged in an edge region of the housing. In particular, if a tube in which the device is arranged has a rectangular inner cross-section, the at least one roller can be guided in an inner corner of the tube. According to a preferred embodiment, at least one roller has a larger diameter than a diagonal cross-section of the housing. This reliably prevents contact between the housing of the device and the inner wall of a tube in which the device may be housed. The aforementioned electronic unit can include a transmitter and receiver for wireless data transmission. This enables the rapid retrieval of the recorded measurements, preferably when the device has been brought back to the surface and the vibrating lance is moved to a new position. The electronic unit can include a data storage device for temporarily storing measured values. This allows measurements to be taken to determine the device's inclination, after which the device can be brought back to the surface. The temporarily stored measured values ​​can then be read out. The device housing may have an adjustable (especially manually) operating element, in particular a rotary knob, which allows the measurement results to be referenced, especially to be set to north. A smartphone, for example, can be used for alignment. The measured values ​​can then be calibrated to north. According to another aspect, a system is provided that includes a device according to one of the aforementioned aspects. A tube is attached to the vibrating lance, in which the device is housed. Accordingly, the inclination can be measured concurrently with the vibrating process during production. Another aspect of the invention relates to the use of a device for determining the path of a vibrating lance in the subsurface. The device can be designed according to any of the aspects mentioned above. Brief description of the drawings Further features and advantages will become apparent from the following description. Fig. 1 shows a device according to one embodiment of the invention, arranged in a tube attached to a vibrating lance. Fig. 2 is another view of the device according to one embodiment of the invention. Fig. 3 shows the device according to one embodiment of the invention, with parts of the device's housing omitted. Description of a preferred embodiment A preferred embodiment is described below with reference to the accompanying drawings. Modifications of certain features can be combined to create further embodiments. According to the embodiment, a device 10 is provided which is configured to determine the path of a vibratory lance 100 in the subsurface. For this purpose, a pipe 50 is attached to the lance 100, in particular welded to it, in which the device 10 is received. The pipe 50 has a substantially rectangular internal cross-section, although other cross-sectional shapes can also be implemented according to modifications. The measurement using device 10 can be carried out concurrently with the production process, i.e., once the vibratory lance 100 has been inserted into the subsoil and has reached its final depth. As soon as the vibratory lance 100 has reached its final depth in the subsoil, device 10 can be moved along the vibratory lance 100 into the subsoil and inclination values ​​can be determined. The device 10 according to the embodiment comprises a housing 11 which, viewed in cross-section, has a substantially rectangular shape. The cross-sectional shape of the device 10 is thus adapted to the inner cross-section of the tube 50. If the tube 50 has a different cross-sectional shape according to the aforementioned modifications, the housing 11 can also have a correspondingly different shape. The housing 11 accommodates a first driven roller 12 and a second driven roller 13, with sections of the circumference of each roller 12, 13 extending in opposite areas outside the housing 11. The areas of the rollers 12, 13 located outside the housing 11 are arranged in a respective edge region of the housing 11, whereby a section of the circumference of each roller 12, 13 can make contact with the interior of the tube 50 on one side. The rollers 12, 13 are positioned at opposite ends of the housing 11 when viewed in its longitudinal or extensional direction, so that the rollers 12, 13 support the respective end regions of the housing 11 against the tube 50. Furthermore, sections of the rollers 12, 13 protrude from opposite edges of the housing 11. In the extension direction of the housing 11, a counter-pressure roller 14 is provided between the rollers 12 and 13. The counter-pressure roller 14 is spring-mounted and can provide support for the device 10 in the area between the rollers 12 and 13 during operation. Adjacent to rollers 12, 13, a drive unit 15, 17 is provided to drive the respective roller 12, 13 via a respective gearbox 15a, 17a. By driving the rollers 12, 13, which are arranged on opposite sides of the housing 11, the device 10 can be moved downwards into the ground in a directionally stable manner, and measured values ​​can be added unambiguously and with directional accuracy. The device 10 incorporates energy storage devices 16 to enable operation of the device 10 independently of a power supply. The energy storage devices 16 supply the drive units 15, 17. The housing 11 of the device 10 also contains sensors configured to detect the tilt values ​​of the device 10 in each direction at predefined intervals. Furthermore, the device incorporates a microelectronic unit 19 that derives a depth measurement from the rotation of the rollers and detects the tilt values ​​of the device 10 in directions perpendicular to each other. The electronics unit 19 includes a component for controlling the drive units 15, 17, a component for receiving measured values ​​from the aforementioned sensors, a data storage device and a data transmission device. During operation, the upper endpoint of the pipe 50 is also detected by sensors of the device 10 and defined as a zero position, which allows the device 10 to transmit the measured data to a computing unit, such as a laptop or a tablet. Data transmission can be wireless. For this purpose, the device 10 includes a transmitter and receiver unit for wireless data transmission. Data management takes place on the processing unit, and the precise coordinates with the planned axis designations are entered via the processing unit. All data refers to the upper reference point of the injection point, which, measured by a surveyor, corresponds to the target data. The measured paths of the vibrated lance trajectories are then aligned with these target positions. QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature DE 10 2015 200 530 A1

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Claims

Device (10) for determining the course of a vibrating lance (100) in the subsoil, comprising: a housing (11) which receives at least one driven roller (12, 13) and is configured to move along the vibrating lance (100), wherein furthermore an electronic unit (19) with at least one sensor is provided which is configured to detect inclinations of the device (10). Device (10) according to claim 1, wherein the electronic unit (19) has a component for receiving measured values ​​from the at least one sensor, which is configured to receive data from the sensor continuously or at intervals. Device (10) according to one of the preceding claims, wherein two or more rollers (12, 13) and a counter-pressure roller (14) are provided, wherein the counter-pressure roller (14) is arranged in the extension direction of the device (10) between at least two rollers (12, 13). Device (10) according to claim 3, wherein the counter-pressure roller (14) is spring-mounted. Device (10) according to one of the preceding claims, further comprising an energy storage device (16) for supplying a drive unit (15, 17) of the at least one driven roller (12, 13). Device (10) according to one of the preceding claims, wherein the housing (11) has a rectangular shape in cross-section. Device (10) according to claim 6, wherein sections of the circumference of the at least one roller (12, 13) are arranged in an edge region of the housing (11). Device (10) according to one of claims 6 - 7, wherein the at least one roller (12, 13) has a larger diameter than a diagonal cross-section of the housing (11). Device (10) according to one of the preceding claims, wherein the electronic unit (19) comprises a transmitter and receiver unit for wireless data transmission. Device (10) according to one of the preceding claims, wherein the electronic unit (19) comprises a data storage device. Device (12) according to one of the preceding claims, further comprising an adjustable actuating element, in particular a rotary knob, with which a device for referencing the data of the sensor can be actuated. System comprising a vibrating lance (100) to which a tube (50) is attached, wherein a device (10) according to one of the preceding claims is received in the tube (50). Use of a device (10) for determining the course of a vibratory lance (100) in the subsoil, wherein the device (100) comprises: a housing (11) which housing (11) accommodates at least one driven roller (12, 13) and is configured to move along the vibratory lance (50), wherein at least one sensor is further provided which is configured to detect inclinations of the device (10).

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