A measuring device for highway survey and design

Abstract

The utility model provides a kind of measuring device for highway reconnaissance design belongs to road surveying equipment technical field.The utility model embodiment provides the measuring device for highway reconnaissance design, including staff component, drill, direct current motor, power component and support and adjusting mechanism, by rotating and setting drill in the end of staff component, direct current motor and the power component of power supply to direct current motor are built-in in the inside of staff component, when needing to insert staff component into the soil of ground survey point, only need to insert drill into the soil of ground survey point, then start direct current motor, make drill automatic drilling into the soil of ground survey point by direct current motor drive drill rotation, simultaneously, drill drives staff component to insert into the preset position in ground soil, so as not to need to insert staff component into the ground survey point by measurement personnel manually, save work time and improve measurement efficiency, can greatly reduce the labor intensity of measurement personnel, not easy to cause measurement personnel to appear fatigue.

Description

Technical Field

[0001] This utility model belongs to the technical field of road surveying equipment, and in particular, relates to a surveying device for highway surveying and design. Background Technology

[0002] In highway surveying, a level and surveying markers are typically used together to measure the elevation difference between two points on the ground. During measurement, the surveying markers must be erected vertically at the measurement point and perpendicular to the horizontal plane to ensure accuracy. Currently, surveying markers are usually inserted manually by surveyors to the corresponding ground measurement points for accurate observation. However, this manual insertion method is not only time-consuming and inefficient but also increases the workload for surveyors. Utility Model Content

[0003] Based on the above-mentioned problems in the existing technology, the purpose of this utility model embodiment is to provide a surveying device for highway surveying and design, so as to solve the technical problem that the surveying benchmarks in the existing technology need to be manually inserted into the ground measurement points by the surveyors, which not only consumes time and reduces measurement efficiency, but also increases the labor intensity of the surveyors.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a surveying device for highway surveying and design, comprising:

[0005] Benchmark components;

[0006] The drill bit is rotatably mounted at the first end of the benchmark assembly;

[0007] A DC motor is used to drive the drill bit to rotate. The pointer assembly has a cavity for accommodating the DC motor. The DC motor is fixedly installed in the cavity, and the motor shaft of the DC motor is connected to the drill bit.

[0008] A power supply assembly for supplying power to the DC motor, the power supply assembly being disposed within the accommodating cavity adjacent to the DC motor, the DC motor being electrically connected to the power supply assembly; and

[0009] A support and adjustment mechanism is provided for adjusting the benchmark assembly to keep it perpendicular to the horizontal plane and for supporting the benchmark assembly to keep it upright at the ground measurement point. The support and adjustment mechanism includes a support base perpendicular to the axial direction of the benchmark assembly, a plurality of threaded shafts axially parallel to the axial direction of the benchmark assembly, support feet at the bottom of each threaded shaft, and a rotating handle at the top of each threaded shaft. A mounting hole is provided centrally on the support base along the axial direction of the benchmark assembly. The benchmark assembly is inserted into the mounting hole and fixedly connected to the support base. A plurality of internal threaded holes are provided around the mounting hole on the support base. The axial direction of the internal threaded holes is parallel to the axial direction of the benchmark assembly. The plurality of threaded shafts are arranged one-to-one with the plurality of internal threaded holes, and each threaded shaft is threadedly connected to the corresponding internal threaded hole.

[0010] Furthermore, the marker assembly includes a first marker, a second marker, and a protective sleeve. The drill bit is rotatably mounted on the first end of the first marker. The protective sleeve is axially movable and fitted onto the first marker near the drill bit. The first marker has a receiving cavity inside and a receiving opening at the second end. A connecting pipe communicating with the receiving cavity is provided inside the first marker. The second marker is inserted into the connecting pipe through the receiving opening.

[0011] Furthermore, the first end of the second marker extends into the connecting pipe, the second end of the second marker extends to the outside of the first marker, the inner wall of the connecting pipe is provided with a first internal thread, the second marker is provided with a first external thread adapted to the first internal thread, and the second marker is threadedly connected to the connecting pipe.

[0012] Furthermore, the inner wall of the protective sleeve is provided with a second internal thread, and the first marker is provided with a second external thread that is adapted to the second internal thread. The protective sleeve is threadedly connected to the first marker near the drill bit.

[0013] Furthermore, the outer circumferential surface of the first marker is provided with a stop step that can stop the top of the protective sleeve.

[0014] Furthermore, the drill bit includes a tapered drill body and a rotating shaft fixedly connected to the tapered drill body. The first end of the first marker is provided with a first bearing hole, in which a first bearing is installed. The rotating shaft is rotatably installed in the first bearing hole via the first bearing.

[0015] Furthermore, the first marker is also provided with a second bearing hole that connects the first bearing hole and the accommodating cavity. A second bearing is provided in the second bearing hole, and the motor shaft of the DC motor is rotatably mounted in the second bearing hole through the second bearing. The motor shaft of the DC motor is splinedly connected to the rotating shaft.

[0016] Furthermore, a foot pedal is provided on the outer peripheral surface of the support base, and the foot pedal is provided with an anti-slip structure.

[0017] Furthermore, the power supply assembly includes an insulating sleeve that is closed at one end and open at the other end, a battery housed in the insulating sleeve, and a plug that closes the open end of the insulating sleeve. The insulating sleeve is provided with a third external thread that is adapted to the first internal thread on the inner wall of the connecting pipe. The insulating sleeve is threadedly connected to the connecting pipe, and the battery is electrically connected to the DC motor.

[0018] Furthermore, the support base is a rectangular support plate, and the four corners of the support plate are respectively provided with internal threaded holes, which are evenly arranged along the circumference of the marker assembly.

[0019] Compared with the prior art, one or more technical solutions in the embodiments of this utility model have at least one of the following beneficial effects:

[0020] The highway surveying and design measuring device in this embodiment of the invention features a drill bit mounted on the end of a marker assembly. A DC motor and a power supply unit for the DC motor are built into the marker assembly. When the marker assembly needs to be inserted into the soil at a ground measurement point, the drill bit is simply inserted, and the DC motor is turned on. The DC motor drives the drill bit to rotate, automatically drilling into the soil at the measurement point. Simultaneously, the drill bit propels the marker assembly into a preset position in the soil. This eliminates the need for manual insertion of the marker assembly by surveyors, saving time and improving measurement efficiency. Furthermore, it significantly reduces the labor intensity of surveyors, minimizing fatigue. In addition, the support and adjustment mechanism allows the marker assembly to stand upright and be fixed at the ground measurement point, eliminating the need for surveyors to hold the marker assembly, freeing their hands and further reducing labor intensity. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A three-dimensional structural schematic diagram of the highway surveying and design measuring device provided by this utility model;

[0023] Figure 2 A schematic diagram of the main structure of the surveying device for highway surveying and design provided by this utility model;

[0024] Figure 3 A cross-sectional structural schematic diagram of the highway surveying and design measuring device provided by this utility model;

[0025] Figure 4 An exploded view of the benchmark assembly provided by this utility model;

[0026] Figure 5 A cross-sectional structural schematic diagram of the first benchmark provided by this utility model;

[0027] Figure 6 A cross-sectional view of the protective sleeve provided by this utility model;

[0028] Figure 7 A three-dimensional structural diagram of the support base provided by this utility model;

[0029] Figure 8 Exploded view of the surveying device for highway surveying and design provided by this utility model.

[0030] The following are the labeling elements in the figure:

[0031] Marker assembly; 11-First marker; 111-Receiving port; 112-Connecting pipe; 113-First internal thread; 114-Second external thread; 12-Second marker; 121-First external thread; 13-Protective sleeve; 131-Second internal thread; 14-Receiving cavity; 15-Stop step; 16-First bearing hole; 17-Second bearing hole;

[0032] 2-Drill bit; 21-Conical drill body; 22-Rotating shaft;

[0033] 3 - DC motor; 31 - Motor shaft;

[0034] 4-Power supply assembly; 41-Insulating sleeve; 42-Battery; 43-Plug; 44-Third external thread;

[0035] 5-Support and adjustment mechanism; 51-Support base; 511-Mounting hole; 512-Internal threaded hole; 52-Threaded shaft; 53-Support foot; 54-Rotating handle; 55-Foot pedal;

[0036] 6-First bearing; 7-Second bearing. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] It should be noted that when an element is referred to as "connected to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," and "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "attached" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0040] Please refer to the following: Figures 1 to 8 The measuring device for highway surveying and design provided in this embodiment of the present invention will now be described. Please refer to the following for further details. Figure 1 , Figure 2 , Figure 3 and Figure 4The highway surveying and design measuring device provided in this embodiment includes a marker assembly 1, a drill bit 2, a DC motor 3, a power supply assembly 4, and a support and adjustment mechanism 5. The drill bit 2 is used to drill into the soil at the ground measuring point. The drill bit 2 is made of stainless steel and is rotatably mounted at the first end of the marker assembly 1. The DC motor 3 drives the drill bit 2 to rotate so that the drill bit 2 automatically drills into the ground soil. The marker assembly 1 has a housing cavity 14 for accommodating the DC motor 3. The DC motor 3 is fixedly installed in the housing cavity 14, and the motor shaft 31 of the DC motor 3 is connected to the drill bit 2. The power supply assembly 4 supplies power to the DC motor 3. The power supply assembly 4 is located in the housing cavity 14 near the DC motor 3, and the DC motor 3 is electrically connected to the power supply assembly 4. The support and adjustment mechanism 5 is used to adjust the marker assembly 1 so that the marker assembly 1 is perpendicular to the horizontal plane, and the support and adjustment mechanism 5 can support the marker assembly 1 so that the marker assembly 1 is upright at the ground measuring point. Please refer to further details. Figure 1 , Figure 2 , Figure 7 and Figure 8The support and adjustment mechanism 5 includes a support base 51, multiple threaded shafts 52, support feet 53, and a rotating handle 54. The support base 51 is perpendicular to the axial direction of the marker assembly 1. The axial direction of each threaded shaft 52 is parallel to the axial direction of the marker assembly 1. Each support foot 53 is located at the bottom end of the corresponding threaded shaft 52, and each rotating handle 54 is located at the top end of the corresponding threaded shaft 52. A mounting hole 511 is centrally located on the support base 51 and extends through the axial direction of the marker assembly 1. The marker assembly 1 is inserted into the mounting hole 511 and is fixedly connected to the support base 51. Multiple internal threaded holes 512 are formed around the mounting hole 511 on the support base 51. The axial direction of the internal threaded holes 512 is parallel to the axial direction of the marker assembly 1. The multiple threaded shafts 52 are arranged one-to-one with the multiple internal threaded holes 512, and each threaded shaft 52 is threaded into the corresponding internal threaded hole 512. In use, the drill bit 2 is inserted into the soil at the ground measurement point, and the DC motor 3 is turned on. The DC motor 3 drives the drill bit 2 to rotate, allowing it to automatically drill into the ground soil. Simultaneously, the drill bit 2 drives the marker assembly 1 to insert into a preset position in the ground soil. After the drill bit 2 has drilled into the preset position in the ground soil, the DC motor 3 is turned off. By rotating each rotating handle 54, the corresponding threaded shaft 52 can be rotated. Since each threaded shaft 52 is threadedly connected to the corresponding internal threaded hole 512 on the support base 51, the support base 51 can be leveled by adjusting each threaded shaft 52. It should be noted that a level bubble meter can be installed on the support base 51 to facilitate leveling. After adjusting the support base 51 to be level with the horizontal plane, the vertically standing pole assembly 1 on the support base 51 is perpendicular to the horizontal plane and can be supported on the ground by the support feet 53 on each threaded shaft 52, which provides stable support for the support base 51 and the pole assembly 1 on the support base 51. In this way, the pole assembly 1 can stand upright and be fixed to the ground measurement point without the need for the measuring personnel to hold the pole assembly 1.

[0041] The highway surveying and design measuring device provided in this embodiment, compared with the prior art, uses a drill bit 2 that is rotated at the end of the marker assembly 1. A DC motor 3 and a power supply assembly 4 that supplies power to the DC motor 3 are built into the marker assembly 1. When the marker assembly 1 needs to be inserted into the soil at the ground measuring point, only the drill bit 2 needs to be inserted into the soil, and then the DC motor 3 is turned on. The DC motor 3 drives the drill bit 2 to rotate, causing the drill bit 2 to automatically drill into the soil at the ground measuring point. Simultaneously, the drill bit 2 drives the marker assembly 1 to a preset position in the ground soil. Therefore, surveyors do not need to manually insert the marker assembly 1 into the ground measuring point, saving time and improving measurement efficiency, and significantly reducing the labor intensity of surveyors, making them less prone to fatigue. Furthermore, by setting a support and adjustment mechanism 5, the marker assembly 1 can be made upright and fixed at the ground measuring point without the need for surveyors to hold it, freeing their hands and further reducing their labor intensity.

[0042] Please refer to the following: Figure 3 , Figure 4 and Figure 5In some embodiments, the marker assembly 1 includes a first marker 11, a second marker 12, and a protective sleeve 13. A drill bit 2 is rotatably mounted at the first end of the first marker 11. The protective sleeve 13 is axially movable and fitted onto the first marker 11 near the drill bit 2. The first marker 11 has an internal receiving cavity 14, and a receiving opening 111 at its second end. A connecting pipe 112 communicating with the receiving cavity 14 is provided inside the first marker 11. The second marker 12 is inserted into the connecting pipe 112 via the receiving opening 111. In this embodiment, when the marker assembly 1 is not in use or during transport, the protective sleeve 13 can be moved axially along the first marker 11 and toward its first end, allowing it to fit over the drill bit 2 at the first end of the first marker 11. This conceals the drill bit 2 within the protective sleeve 13, preventing injury from the drill bit 2 when the marker assembly 1 is not in use or during transport. Meanwhile, the protective sleeve 13 also protects the drill bit 2, preventing it from being exposed and damaged by impacts, thus reducing its service life. When the marker assembly 1 is needed, the protective sleeve 13 can be moved along the axial direction of the first marker 11 and toward its second end to expose the drill bit 2 for drilling. Furthermore, by housing the second marker 12 within the connecting pipe 112 of the first marker 11, the second marker 12 can be extended or retracted, allowing the length of the marker assembly 1 to be freely adjusted according to surveying needs. It should be noted that the first marker 11 and / or the protective sleeve 13 are inserted into the mounting hole 511 of the support base 51, and the first marker 11 and / or the protective sleeve 13 are fixedly connected to the support base 51 by welding or other means, ensuring that the first marker 11 is upright and fixed to the support base 51.

[0043] Please refer to the following: Figure 3 , Figure 4 and Figure 8 In some embodiments, the first end of the second marker 12 extends into the connecting pipe 112, and the second end of the second marker 12 extends outside the first marker 11. The inner wall of the connecting pipe 112 is provided with a first internal thread 15, and the second marker 12 is provided with a first external thread 121 adapted to the first internal thread 15. The second marker 12 is threadedly connected to the connecting pipe 112. In this embodiment, the second marker 12 is threadedly connected to the connecting pipe 112, and its telescopic movement can be achieved simply by rotating it relative to the first marker 11. This allows the length of the marker assembly 1 to be freely adjusted according to surveying needs.

[0044] Please refer to the following: Figure 1 , Figure 3 and Figure 6In some embodiments, the inner wall of the protective sleeve 13 is provided with a second internal thread 131, and the first marker 11 is provided with a second external thread 114 adapted to the second internal thread 131. The protective sleeve 13 is threadedly connected to the first marker 11 at a position near the drill bit 2. In this embodiment, by threading the protective sleeve 13 to the first marker 11, the axial movement of the protective sleeve 13 can be achieved simply by rotating the protective sleeve 13 relative to the first marker 11, thereby facilitating the storage, concealment, or exposure of the drill bit 2.

[0045] Please refer to the following: Figure 1 , Figure 4 and Figure 5 In some embodiments, the outer peripheral surface of the first marker 11 is provided with a stop step 15 that can stop the top of the protective sleeve 13. The stop step 15 abuts against and restricts the position of the protective sleeve 13 relative to the first marker 11, which on the one hand prevents the protective sleeve 13 from moving excessively, and on the other hand enhances the stability of the protective sleeve 13 fitted on the outside of the first marker 11.

[0046] Please refer to the following: Figure 1 , Figure 3 and Figure 8 In some embodiments, the drill bit 2 includes a tapered drill body 21 and a rotating shaft 22 fixedly connected to the tapered drill body 21. The first end of the first marker 11 is provided with a first bearing hole 16, and a first bearing 6 is installed in the first bearing hole 16. The rotating shaft 22 is rotatably installed in the first bearing hole 16 through the first bearing 6.

[0047] Please refer to the following: Figure 3 , Figure 5 and Figure 8 In some embodiments, the first reference rod 11 is also provided with a second bearing hole 17 that connects the first bearing hole 16 and the accommodating cavity 14. A second bearing 7 is provided in the second bearing hole 17. The motor shaft 31 of the DC motor 3 is rotatably mounted in the second bearing hole 17 through the second bearing 7. The motor shaft 31 of the DC motor 3 is splinedly connected to the rotating shaft 22.

[0048] Please refer to the following: Figure 1 , Figure 3 and Figure 7 In some embodiments, a foot pedal 55 is provided on the outer peripheral surface of the support base 51. The foot pedal 55 has an anti-slip structure, which may be, but is not limited to, anti-slip patterns or anti-slip mats. The surveyor can step on the foot pedal 55 to allow the drill bit 2 at the bottom of the marker assembly 1 to be inserted into the soil, reducing the labor intensity of the surveyor.

[0049] Please refer to the following: Figure 3 and Figure 8In some embodiments, the power supply assembly 4 includes an insulating sleeve 41 that is closed at one end and open at the other, a battery 42 housed within the insulating sleeve 41, and a plug 43 that closes the open end of the insulating sleeve 41. The insulating sleeve 41 has a third external thread 44 that is adapted to a first internal thread 15 on the inner wall of the connecting pipe 112. The insulating sleeve 41 is threadedly connected to the connecting pipe 112, and the battery 42 is electrically connected to the DC motor 3. In this embodiment, the closed end of the insulating sleeve 41 can provide a pressure and positioning effect on the DC motor 3, preventing the DC motor 3 from shaking during operation.

[0050] Please refer to the following: Figure 1 , Figure 7 and Figure 8 In some embodiments, the support base 51 is a rectangular support plate with internal threaded holes 512 at its four corners. The four internal threaded holes 512 are evenly arranged along the circumference of the guide rod assembly 1, so that the four threaded shafts 52 are evenly arranged along the circumference of the guide rod assembly 1, which facilitates the leveling of the support plate by rotating the threaded shafts 52.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A surveying device for highway surveying and designing, characterized in that, include: Benchmark components; The drill bit is rotatably mounted at the first end of the benchmark assembly; A DC motor is used to drive the drill bit to rotate. The pointer assembly has a cavity for accommodating the DC motor. The DC motor is fixedly installed in the cavity, and the motor shaft of the DC motor is connected to the drill bit. A power supply assembly for supplying power to the DC motor, the power supply assembly being disposed within the accommodating cavity adjacent to the DC motor, the DC motor being electrically connected to the power supply assembly; and A support and adjustment mechanism is provided for adjusting the benchmark assembly to keep it perpendicular to the horizontal plane and for supporting the benchmark assembly to keep it upright at the ground measurement point. The support and adjustment mechanism includes a support base perpendicular to the axial direction of the benchmark assembly, a plurality of threaded shafts axially parallel to the axial direction of the benchmark assembly, support feet at the bottom of each threaded shaft, and a rotating handle at the top of each threaded shaft. A mounting hole is provided centrally on the support base along the axial direction of the benchmark assembly. The benchmark assembly is inserted into the mounting hole and fixedly connected to the support base. A plurality of internal threaded holes are provided around the mounting hole on the support base. The axial direction of the internal threaded holes is parallel to the axial direction of the benchmark assembly. The plurality of threaded shafts are arranged one-to-one with the plurality of internal threaded holes, and each threaded shaft is threadedly connected to the corresponding internal threaded hole.

2. The surveying device for highway surveying and design as described in claim 1, characterized in that, The marker assembly includes a first marker, a second marker, and a protective sleeve. The drill bit is rotatably mounted on the first end of the first marker. The protective sleeve is axially movable and fitted onto the first marker near the drill bit. The first marker has a receiving cavity inside and a receiving opening at the second end. A connecting pipe communicating with the receiving cavity is provided inside the first marker. The second marker is inserted into the connecting pipe through the receiving opening.

3. The surveying device for highway surveying and design as described in claim 2, characterized in that, The first end of the second marker extends into the connecting pipe, and the second end of the second marker extends to the outside of the first marker. The inner wall of the connecting pipe is provided with a first internal thread, and the second marker is provided with a first external thread that matches the first internal thread. The second marker is threadedly connected to the connecting pipe.

4. The surveying device for highway surveying and design as described in claim 2, characterized in that, The inner wall of the protective sleeve is provided with a second internal thread, and the first marker is provided with a second external thread that is adapted to the second internal thread. The protective sleeve is threadedly connected to the first marker near the drill bit.

5. The surveying device for highway surveying and design as described in claim 2, characterized in that, The outer circumferential surface of the first marker is provided with a stop step that can stop the top of the protective sleeve.

6. The surveying device for highway surveying and design as described in claim 2, characterized in that, The drill bit includes a tapered drill body and a rotating shaft fixedly connected to the tapered drill body. The first end of the first marker is provided with a first bearing hole, in which a first bearing is installed. The rotating shaft is rotatably installed in the first bearing hole through the first bearing.

7. The surveying device for highway surveying and design as described in claim 6, characterized in that, The first marker is also provided with a second bearing hole that connects the first bearing hole and the accommodating cavity. A second bearing is provided in the second bearing hole. The motor shaft of the DC motor is rotatably mounted in the second bearing hole through the second bearing. The motor shaft of the DC motor is splinedly connected to the rotating shaft.

8. The surveying device for highway surveying and design as described in claim 2, characterized in that, The outer circumferential surface of the support base is provided with a foot pedal, and the foot pedal is provided with an anti-slip structure.

9. The surveying device for highway surveying and design as described in claim 2, characterized in that, The power supply assembly includes an insulating sleeve that is closed at one end and open at the other end, a battery housed in the insulating sleeve, and a plug that closes the open end of the insulating sleeve. The insulating sleeve is provided with a third external thread that is adapted to a first internal thread on the inner wall of the connecting pipe. The insulating sleeve is threadedly connected to the connecting pipe, and the battery is electrically connected to the DC motor.

10. The surveying device for highway surveying and design as described in any one of claims 1 to 9, characterized in that, The support base is a rectangular support plate, and the four corners of the support plate are respectively provided with internal threaded holes, which are evenly arranged along the circumference of the marker assembly.

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