Geological and geotechnical investigation strength test device

Abstract

The invention relates to the technical field of strength detection, in particular to a geological and geotechnical investigation strength test device which comprises a supporting mounting cylinder, a conical surface mounting cover arranged at one end of the supporting mounting cylinder, a mounting lug boss arranged in the middle of the conical surface mounting cover, a hanging ring arranged on the mounting lug boss, and an adaptive positioning locking mechanism arranged on the supporting mounting cylinder, comprising a plurality of adaptive locking modules arranged on the outer side of a supporting mounting cylinder at equal angles. And the displacement strength detection mechanism comprises a limiting guide ring arranged at the other end of the supporting installation cylinder, and a plurality of mobile detection modules are arranged on the limiting guide ring in a matched mode. The method fundamentally changes the limitation of the traditional sample separation laboratory test, realizes the efficient, stable and comprehensive in-situ evaluation of the original stratum strength, has the remarkable advantages of real data, high efficiency, strong adaptability, good reliability and the like, and has important value for improving the accuracy of geological exploration and the scientificity of engineering construction.

Description

Technical Field

[0001] This invention relates to the field of strength testing technology, and in particular to a strength testing device for geological and soil exploration. Background Technology

[0002] The mechanical strength parameters of soil and rock masses are core bases in geological exploration and geotechnical engineering design, and their accuracy directly affects the safety, economy, and feasibility of construction projects. Traditional methods for obtaining soil and rock strength mainly rely on on-site sampling followed by standardized uniaxial compressive strength and direct shear tests in a laboratory. While this method has become standardized, it has inherent drawbacks: First, the sampling, transportation, and preparation processes inevitably disturb the samples, altering their water content, density, and structure, making the laboratory data insufficient to fully represent the true mechanical properties of the soil and rock in their in-situ state. Second, this method is time-consuming, with a long cycle from sampling to obtaining test results, making it difficult to meet the timeliness requirements of rapid exploration and dynamic design. Third, the limited number of samples can only represent the characteristics of individual discrete points in the borehole, failing to comprehensively reflect the complex spatial variability and anisotropy of the soil and rock mass, introducing uncertainty into engineering judgments.

[0003] To overcome the limitations of laboratory testing, in-situ testing techniques, such as static cone penetration tests, pressuremeter tests, and vane shear tests, have been developed and applied. However, existing techniques are still insufficient for direct and efficient in-situ testing of the strength of the soil and rock walls in deep boreholes. Current borehole testing devices or probes often suffer from the following problems: First, the devices are often fixed in the borehole using simple mechanical supports or their own weight. Under conditions of soft, broken, or uneven borehole walls, slippage or vibration can easily occur, leading to unstable and unreliable test data. Second, the testing methods are mostly single-point and unidirectional pressure application. A single borehole run can only obtain strength information from a limited location and in a single direction, resulting in low detection efficiency, narrow data coverage, and difficulty in systematically evaluating profiles at the same depth. Third, their functions are relatively simple, lacking the ability to flexibly adjust the angle and range of force application, failing to simulate the complex multi-directional stress states that soil and rock masses may experience in actual engineering projects, and having limited adaptability to soil and rock of different strength grades. Fourth, in deep boreholes, complex geological environments, or field sites with inconvenient power supply, the continuous and stable power supply and operation of the devices face challenges.

[0004] The present invention aims to solve the technical problems existing in the prior art. To this end, a geological and soil exploration strength testing device is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a geological and soil exploration strength testing device to solve the technical problems existing in the prior art.

[0006] By adopting the above technical solution, the present invention has the following beneficial effects:

[0007] This invention provides a geological and geotechnical exploration strength testing device, comprising a support mounting cylinder, a battery compartment inside the support mounting cylinder, a conical mounting cover at one end of the support mounting cylinder, a mounting protrusion at the middle of the conical mounting cover, a hanging ring on the mounting protrusion, a reset buckle rotatably mounted on the hanging ring, a power supply cable extending from the mounting protrusion on one side of the hanging ring, and a plurality of battery packs inside the battery compartment. The device also includes: an adaptive positioning and locking mechanism comprising a plurality of adaptive locking modules arranged at equal angles on the outside of the support mounting cylinder; and a displacement strength detection mechanism comprising a limiting guide ring at the other end of the support mounting cylinder, on which a plurality of movement detection modules are fitted.

[0008] As a further aspect of the present invention: the adaptive locking module includes a locking arc panel set at equal angles on the outside of the support mounting cylinder, a support mounting frame is provided on the outside of the support mounting cylinder directly opposite the locking arc panel, a steering drive column is rotatably provided on the support mounting frame, a swing telescopic column is provided on the outside of the steering drive column, and the outer end of the swing telescopic column is connected to the inner side of the locking arc panel through a follower rotating shaft.

[0009] As a further aspect of the present invention: an arc-shaped contact airbag is provided on the outer side of the locking arc panel, and a plurality of anti-slip rubber strips are provided at equal intervals on the outer side of the arc-shaped contact airbag, and a flow guide installation cylinder communicating with the arc-shaped contact airbag is provided on the inner side of the locking arc panel.

[0010] As a further embodiment of the present invention: an annular guide tube is provided on the outer side of the support mounting cylinder, a guide cavity is provided inside the conical mounting cover, the guide cavity and the annular guide tube are connected by several pressure regulating air pumps, and the annular guide tube and the guide mounting cylinder are both connected to a telescopic guide tube.

[0011] As a further aspect of the present invention: the movement detection module includes an arc-shaped moving frame that is fitted on a limiting guide ring, a deflection mounting frame that is provided at the lower end of the arc-shaped moving frame, a deflection drive column that is rotatably mounted on the deflection mounting frame, a deflection mounting rod that is mounted on the deflection drive column, an adjustment drive column that is provided at the outer end of the deflection mounting rod, an adjustment mounting frame that is rotatably mounted in conjunction with the adjustment drive column, a pressure boosting drive telescopic column that is provided on the adjustment mounting frame, and a pressure applying top block that is positioned directly opposite the outer end of the pressure boosting drive telescopic column.

[0012] As a further embodiment of the present invention: the outer end of the pressurization drive telescopic column is provided with an internally threaded mounting cylinder, and one end of the pressure-applying top block is provided with a threaded mounting column in conjunction with the internally threaded mounting cylinder.

[0013] As a further aspect of the present invention: a booster oil pump is provided on the adjusting mounting bracket on one side of the booster drive telescopic column, and a number of anti-slip textures are provided at equal angles on the outer side of the pressure-applying top block.

[0014] As a further embodiment of the present invention: a steering bevel gear ring is provided inside the support mounting cylinder below the battery compartment, and a number of drive bevel gears are semi-embedded at equal angles at the upper end of the arc-shaped moving frame in conjunction with the steering bevel gear ring, and all drive bevel gears mesh with the steering bevel gear ring.

[0015] As a further aspect of the present invention: both the inner and outer sides of the limiting guide ring are provided with annular conductive rails, and the inner side of the arc-shaped moving frame is provided with arc-shaped conductive grooves in conjunction with the annular conductive rails.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] I. Achieving in-situ, real-time, and high-intensity data acquisition

[0018] By lowering the device to the target location inside the borehole using hoisting equipment, strength testing can be performed directly in the in-situ condition of the soil and rock. This avoids problems such as sample disturbance, water loss, and structural changes caused by the need for sampling and transportation to the laboratory in traditional methods, thus obtaining more realistic soil and rock strength data that reflects the original state.

[0019] By employing multiple sets of mobile detection modules that can slide along the limiting guide ring, rapid and repeatable strength tests can be performed on the borehole wall at different orientations and angles at the same depth. This allows for the acquisition of massive amounts of data per unit time, significantly improving the detection coverage and data density, and facilitating a comprehensive evaluation of the spatial variability of the soil and rock mass.

[0020] II. Adaptive and Stable Locking Mechanism

[0021] An adaptive locking mechanism consisting of a steering drive column, a swing telescopic column, and an arc-shaped contact airbag allows for multi-degree-of-freedom adjustment of the locking arc panel. The inflated arc-shaped contact airbag conforms to the irregular gaps and shapes of the borehole wall, achieving a tight fit.

[0022] The airbag inflation and pressurization, combined with the outer anti-slip rubber strip, generate tremendous friction and static pressure, firmly locking the device to the borehole wall. This provides a stable platform for subsequent high-precision strength testing, effectively preventing the device's sliding or vibration from interfering with the test results.

[0023] III. Flexible and scalable detection capabilities

[0024] The moving detection module has deflection and adjustment functions, which allows the pressure block to abut against and press into the soil and rock of the borehole wall at different angles, simulating stress conditions in different directions, thereby obtaining more comprehensive strength parameters.

[0025] The pressure range during testing can be adjusted via a booster pump. The pressure-applying top block uses a threaded connection, which facilitates quick replacement of top blocks of different specifications or materials according to the estimated strength of the soil and rock, thus expanding the applicable range and operating conditions of the device.

[0026] IV. Reliable power supply and operational support

[0027] The device has an internal battery compartment that can automatically switch or supplement power when the external power cable is unexpectedly interrupted, ensuring that the detection work is not interrupted due to temporary power outages, and improving the ability to operate continuously and the integrity of data in complex survey environments.

[0028] The motion detection module achieves power coupling through the sliding contact between the arc-shaped conductive groove and the annular conductive rail. The structure is reliable and ensures a stable power supply during continuous movement and repositioning of the module.

[0029] V. Significant Advantages in Engineering Applications

[0030] Moving the strength testing, which originally had to be done in the laboratory, to the site significantly shortened the time from sampling to data acquisition, accelerating the engineering decision-making process. At the same time, the massive amounts of data collected in situ provided a more direct and reliable basis for engineering design and risk assessment.

[0031] The entire device is highly integrated, and can be put into operation through hoisting and automatic locking, reducing the complexity of on-site operation and the stringent requirements for personnel skills. Its adaptive design makes it suitable for drilling holes of different diameters and wall conditions, making it highly versatile. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a top-view three-dimensional structural diagram of a geological and soil exploration strength testing device.

[0034] Figure 2 This is a schematic diagram of the three-dimensional structure of a geological and soil exploration strength testing device viewed from above and below.

[0035] Figure 3 This is a partial cross-sectional schematic diagram of a geological and soil exploration strength testing device at the annular guide tube.

[0036] Figure 4This is a partial cross-sectional schematic diagram of a geological and soil exploration strength testing device at the limiting guide ring.

[0037] Figure 5 for Figure 3 An enlarged schematic diagram of point a in the middle.

[0038] Figure 6 for Figure 3 Enlarged diagram of point b in the middle.

[0039] Figure 7 for Figure 4 An enlarged view of point c in the middle.

[0040] Figure 8 This is a three-dimensional structural diagram of a mobile detection module in a geological and soil exploration strength testing device.

[0041] Figure 9 This is a three-dimensional structural diagram of a pressure-driven telescopic column in a geological and soil exploration strength testing device.

[0042] Figure 10 This is a three-dimensional structural diagram of the pressure-applying top block in a geological and soil exploration strength testing device.

[0043] 1-Support mounting cylinder, 2-Conical mounting cover, 3-Mounting protrusion, 4-Hanging ring, 5-Annular guide cylinder, 6-Arc-shaped moving frame, 7-Swing telescopic column, 8-Support mounting frame, 9-Steering drive column, 10-Locking arc panel, 11-Telescopic guide tube, 12-Guide mounting cylinder, 13-Arc-shaped contact airbag, 14-Deflection mounting rod, 15-Pressure boosting drive telescopic column, 16-Anti-slip rubber strip, 17-Power supply cable, 18-Limit guide ring. 19-Steering bevel gear ring, 20-Battery compartment, 21-Reset buckle, 22-Battery pack, 23-Pressure regulating air pump, 24-Guide cavity, 25-Annular conductive rail, 26-Arc-shaped conductive groove, 27-Drive bevel gear, 28-Deflection drive column, 29-Deflection mounting bracket, 30-Adjustment mounting bracket, 31-Adjustment drive column, 32-Internal threaded mounting cylinder, 33-Pressure applying top block, 34-Anti-slip texture, 35-Threaded mounting column, 36-Booster oil pump. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0046] Example 1, please refer to Figures 1-2 In this embodiment of the invention, a geological and soil exploration strength testing device includes a support mounting cylinder 1, a battery compartment 20 inside the support mounting cylinder 1, a conical mounting cover 2 at one end of the support mounting cylinder 1, a mounting protrusion 3 at the middle position of the conical mounting cover 2, a hanging ring 4 on the mounting protrusion 3, a reset buckle 21 rotatably mounted on the hanging ring 4, a power supply cable 17 extending from the mounting protrusion 3 on one side of the hanging ring 4, and a plurality of battery packs 22 inside the battery compartment 20. The device also includes: an adaptive positioning and locking mechanism, comprising a plurality of adaptive locking modules arranged at equal angles on the outside of the support mounting cylinder 1; and a displacement strength detection mechanism, comprising a limiting guide ring 18 at the other end of the support mounting cylinder 1, on which a plurality of moving detection modules are fitted.

[0047] In current geological exploration, strength tests on soil and rock are conducted in the laboratory after sample collection, which cannot test the strength of soil and rock in their original state. This device is connected to the external hoisting equipment through the hanging ring 4 and the reset buckle 21 set on it, so that the device can perform strength tests on soil and rock at different heights in the borehole of geological exploration, and can directly obtain the strength data in the original state.

[0048] Meanwhile, the battery pack 22 inside the battery compartment 20 can ensure that the device continues to work for a period of time when the external power cable 17 is unable to supply power, so as to ensure uninterrupted intensity detection during the power restoration period.

[0049] Specifically, the device is hoisted into the target position in the borehole. At this time, several sets of adaptive locking modules lock the support mounting cylinder 1 in the target position, ensuring that the displacement strength detection mechanism can stably carry out the detection operation. Meanwhile, several moving detection modules continuously perform displacement and strength detection operations on the limit guide ring 18, conducting comprehensive strength detection on the target position, significantly increasing the coverage of strength detection per unit time, and increasing the amount of strength detection data.

[0050] Example 2, based on Example 1, please refer to... Figures 1-6In this embodiment of the invention, the adaptive locking module includes a locking arc panel 10 set at equal angles on the outside of the support mounting cylinder 1. A support mounting frame 8 is set on the outside of the support mounting cylinder 1 directly opposite the locking arc panel 10. A steering drive column 9 is rotatably set on the support mounting frame 8. A swing telescopic column 7 is set on the outside of the steering drive column 9. The outer end of the swing telescopic column 7 is connected to the inner side of the locking arc panel 10 through a follower rotating shaft.

[0051] The outer side of the locking arc panel 10 is provided with an arc-shaped abutment airbag 13, and a number of anti-slip rubber strips 16 are provided at equal intervals on the outer side of the arc-shaped abutment airbag 13. The inner side of the locking arc panel 10 is provided with a flow guide installation cylinder 12 that communicates with the arc-shaped abutment airbag 13. The outer side of the support installation cylinder 1 is provided with an annular flow guide cylinder 5. The inside of the conical installation cover 2 is provided with a flow guide cavity 24. The flow guide cavity 24 and the annular flow guide cylinder 5 are connected by a number of pressure regulating air pumps 23. The annular flow guide cylinder 5 and the flow guide installation cylinder 12 are both connected with telescopic guide tubes 11.

[0052] The angle of the swing telescopic column 7 is adjusted by driving the steering drive column 9, and the length of the swing telescopic column 7 is adjusted by extending and retracting until the arc surface abutting airbag 13 on the locking arc panel 10 abuts against the borehole wall under the action of the follower rotating shaft. At this time, the pressure regulating air pump 23 is started to draw the gas in the guide cavity 24 into the annular guide tube 5, which increases the air pressure in the annular guide tube 5. The gas is then introduced into the arc surface abutting airbag 13 through the telescopic guide tube 11 and the guide installation tube 12, so that the arc surface abutting airbag 13 is inflated and deforms to fit the irregular gaps of the borehole wall. The anti-slip rubber strip 16 on the outside of the arc surface abutting airbag 13 can also deform and fit, firmly locking the locking arc panel 10 and the arc surface abutting airbag 13 to the borehole wall, ensuring the stability of the subsequent strength testing process.

[0053] Example 3, based on Example 2, please refer to... Figures 7-10 In this embodiment of the invention, the movement detection module includes an arc-shaped moving frame 6 that is fitted on a limiting guide ring 18. A deflection mounting frame 29 is provided at the lower end of the arc-shaped moving frame 6. A deflection drive column 28 is rotatably mounted on the deflection mounting frame 29. A deflection mounting rod 14 is provided on the deflection drive column 28. An adjustment drive column 31 is provided at the outer end of the deflection mounting rod 14. An adjustment mounting frame 30 is rotatably mounted in conjunction with the adjustment drive column 31. A pressurization drive telescopic column 15 is provided on the adjustment mounting frame 30. A pressure-applying top block 33 is provided directly opposite the outer end of the pressurization drive telescopic column 15.

[0054] The outer end of the booster drive telescopic column 15 is provided with an internal threaded mounting cylinder 32, and one end of the pressure applying top block 33 is provided with a threaded mounting column 35 in cooperation with the internal threaded mounting cylinder 32. A booster oil pump 36 is provided on the adjusting mounting bracket 30 on one side of the booster drive telescopic column 15, and a number of anti-slip textures 34 are provided at equal angles on the outer side of the pressure applying top block 33.

[0055] A steering bevel ring 19 is provided on the inner side of the support mounting cylinder 1 below the battery compartment 20. Several driving bevel gears 27 are semi-embedded at equal angles on the upper end of the arc-shaped moving frame 6 in coordination with the steering bevel ring 19. All driving bevel gears 27 mesh with the steering bevel ring 19. Annular conductive rails 25 are provided on both the inner and outer sides of the limiting guide ring 18. Arc-shaped conductive grooves 26 are provided on the inner side of the arc-shaped moving frame 6 in coordination with the annular conductive rails 25.

[0056] Through the meshing transmission between the drive bevel gear 27 and the steering bevel gear ring 19, the arc-shaped moving frame 6 slides and shifts on the limiting guide ring 18. At the same time, the arc-shaped conductive groove 26 and the annular conductive rail 25 cooperate to achieve coupled power supply, ensuring a stable power supply for the arc-shaped moving frame 6 and its electrical components. The angle of the deflection mounting rod 14 is adjusted by driving the deflection drive column 28, and the angle of the adjustment mounting frame 30 is controlled by adjusting the drive column 31. The angle between the pressurized drive telescopic column 15 and the pressure-applying top block 33 and the borehole wall is adjusted. With the pressurized drive telescopic column 15, the strength of the rock and soil on the borehole wall can be tested at different positions and angles. Multiple sets of moving detection modules operate simultaneously, which can significantly improve the efficiency of strength testing.

[0057] The booster oil pump 36 can increase the detection range during the strength test. With the cooperation of the internal threaded mounting cylinder 32 and the threaded mounting post 35, the pressure top block 33 with different strength test ranges can be easily replaced. At the same time, the anti-slip texture 34 set on the pressure top block 33 can improve the anti-slip effect and increase the success rate of strength test. On the other hand, it can make the force on the pressure top block 33 balanced and ensure its own strength.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A geological investigation intensity test device, comprising a support installation cylinder, the inside of the support installation cylinder is provided with a battery compartment, one end of the support installation cylinder is provided with a conical surface installation cover, the middle position of the conical surface installation cover is provided with an installation protruding part, the installation protruding part is provided with a hanging ring, a reset buckle is rotationally arranged on the hanging ring, and a power supply cable is arranged on the installation protruding part on one side of the hanging ring, characterized in that, Also include: Adaptive positioning locking mechanism, including a number of adaptive locking module is arranged at equal angles outside the support installation cylinder; Displacement strength detection mechanism, including a limit guide ring arranged at the other end of the support installation cylinder, a plurality of movement detection modules are arranged on the limit guide ring.

2. The device for geotechnical investigation strength test according to claim 1, characterized in that, The battery compartment is provided with a plurality of battery packs.

3. The device for geotechnical investigation strength test according to claim 1, characterized in that, The adaptive locking module includes a locking cam plate arranged at equal angles outside the support installation cylinder, a support mounting bracket is arranged opposite to the outer side of the support installation cylinder, a steering drive column is rotatably arranged on the support mounting bracket, an oscillating telescopic column is arranged outside the steering drive column, and the outer end of the oscillating telescopic column is connected to the inner side of the locking cam plate through a follow-up rotating shaft.

4. The device according to claim 3, wherein The outer side of the locking cam plate is provided with an arc surface abutting air bag, a plurality of anti-skid rubber strips are arranged at equal intervals outside the arc surface abutting air bag, and the inner side of the locking cam plate is provided with a flow guide installation cylinder communicated with the arc surface abutting air bag.

5. The device for geotechnical investigation strength test according to claim 4, characterized in that, The outer side of the support installation cylinder is provided with a ring-shaped flow guide cylinder, the inner side of the conical mounting cover is provided with a flow guide cavity, the flow guide cavity and the ring-shaped flow guide cylinder are communicated through a plurality of pressure regulating air pumps, and the ring-shaped flow guide cylinder is communicated with the flow guide installation cylinder through a telescopic guide pipe.

6. The device for strength testing of geological soils according to claim 1, characterized in that The movement detection module includes an arc-shaped moving frame arranged on the limit guide ring, a deflection mounting bracket is arranged at the lower end of the arc-shaped moving frame, a deflection drive column is rotatably arranged on the deflection mounting bracket, a deflection mounting rod is arranged on the deflection drive column, an adjustment drive column is arranged at the outer end of the deflection mounting rod, an adjustment mounting bracket is rotatably arranged in cooperation with the adjustment drive column, a pressure boosting drive telescopic column is arranged on the adjustment mounting bracket, and a pressure boosting drive telescopic column is arranged opposite to the pressure boosting drive telescopic column.

7. The device according to claim 6, wherein The outer end of the pressure boosting drive telescopic column is provided with an internal thread installation cylinder, and one end of the pressure boosting drive telescopic column is provided with a threaded installation column in cooperation with the internal thread installation cylinder.

8. The device according to claim 7, wherein, The adjustment mounting bracket on one side of the pressure boosting drive telescopic column is provided with a pressure boosting oil pump, and the outer side of the pressure boosting drive telescopic column is provided with a plurality of anti-skid patterns at equal angles. 9.The geotechnical investigation strength test device according to claim 6, characterized in that, The inner side of the support installation cylinder below the battery compartment is provided with a steering bevel gear ring, a plurality of drive bevel gears are arranged at equal angles on the upper end of the arc-shaped moving frame in cooperation with the steering bevel gear ring, and the drive bevel gears are meshed with the steering bevel gear ring. 10.The geotechnical investigation strength test device according to claim 9, characterized in that, The inner and outer sides of the limit guide ring are both provided with ring-shaped conductive rails, and the inner side of the arc-shaped moving frame is provided with arc-shaped conductive grooves in cooperation with the ring-shaped conductive rails.

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