A water level meter for monitoring waterlogging and its use method

Abstract

The present invention provides a water level gauge for monitoring waterlogging, comprising a water level gauge body, the water level gauge body comprising a fixed seat, a mounting seat fixedly mounted on the bottom of the fixed seat, a slotted opening on the mounting seat, a movable plate movably mounted inside the slot, an opening on the movable plate, and a fixed column movably mounted inside the opening. The water level gauge for monitoring waterlogging can push the bottom of the support plate downward by adjusting the bolts, and the movement will cushion the mounting seat, thus saving the inconvenience of supporting the mounting seat by debris in the later stage. When the support plate descends, the connecting plate loses the limit on the arc plate, and the reset mechanism pushes the arc plate to be exposed from the inside of the opening. After the arc plate contacts the drilled hole from both sides, it supports the mounting seat as a whole, so that the mounting seat is suspended and installed in the use position, and the height of the mounting seat from the ground can be adjusted in the later stage according to the exposed length of the bottom of the support plate.

Description

Technical Field

[0001] The invention relates to the field of water level gauge equipment, and in particular to a waterlogging monitoring water level gauge and a use method thereof. Background Art

[0002] A water level meter for monitoring waterlogging integrates multiple modules including water level monitoring, water accumulation status and water accumulation depth monitoring, wireless communication, lithium-ion batteries, etc. It is used to monitor water accumulation in low-lying areas of urban roads, tunnels, culverts, and under overpasses. The detected data is transmitted to the monitoring platform via 4G wireless mode to realize the alarm function.

[0003] According to a patent document with the existing publication number CN114019587A, an underground engineering water accumulation monitoring and early warning, water retaining device and working method are disclosed, which includes a pressure water level gauge located in the underground engineering for measuring the depth of water accumulation, a bucket rain gauge for real-time monitoring of precipitation, and a telemetry terminal RTU of a 5G communication monitoring and early warning data module for data information storage, transmission, and sending. The pressure water level gauge and the bucket rain gauge transmit the detection information to the telemetry terminal RTU in real time, and the telemetry terminal RTU transmits the data to the command center and the PLC controller in real time. When this technical solution is used , closely combining modern technologies such as tipping bucket rain gauges, pressure water level gauges, data acquisition telemetry terminals RTU, 5G communications and Internet information analysis with the needs of disaster prevention and mitigation of underground projects, and combining them into a set of efficient, reliable and highly automated drowning prevention and waterlogging monitoring and early warning and intelligent water retaining equipment, which can effectively prevent and solve drowning and waterlogging accidents in urban underground projects. Regarding the above technical solution, although the solution realizes the detection of water level, it is unable to regularly clean the detection sensor during use, and its installation position cannot be quickly adjusted during installation and use, which is inconvenient during use. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a water level gauge for monitoring waterlogging and a method of using the same, so as to solve the problems raised in the above-mentioned background technology. The present invention has a novel structure. When in use, the arc plate and the support plate realize three-point support for the mounting seat, and the three-point support improves the installation stability of the mounting seat. In addition, the arc plate and the support plate cooperate to perform double support adjustment on the overall installation position and height of the mounting seat, and push the movable plate. The movable plate moves on the fixed column and the support column. After the support column enters the opening, it pushes the dust accumulated in the opening outward. At the same time, the fixed column moves on the arc block, and the arc block cleans the dust on the surface of the water level monitoring sensor to avoid the influence of dust adhering to the water level monitoring sensor.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a water level gauge for monitoring waterlogging, including a water level gauge body, the water level gauge body including a fixed seat, a mounting seat is fixedly installed on the bottom of the fixed seat, a groove is opened on the mounting seat, a movable plate is movably installed inside the groove, an opening is opened on the movable plate, a fixed column is movably installed inside the opening, an arc block is movably installed on the top of the fixed column, one end of the arc block is fixed on the inner wall of the opening, an opening is opened on the side of the mounting seat, an arc plate is movably installed inside the opening, a fixed groove is opened on one side of the fixed seat, and a support plate is movably installed inside the fixed groove.

[0006] Furthermore, a shielding plate is movably mounted on the top of the fixing seat, a sliding block is fixed on the inner wall of the shielding plate, and a sliding groove is provided on the fixing seat.

[0007] Furthermore, an adjusting bolt and a switch are respectively installed on the fixing seat, and the adjusting bolt includes a threaded column, and one end of the threaded column is installed on the top of the support plate through a bearing seat.

[0008] Furthermore, an arc groove is provided between the fixing groove and the opening, a connecting plate is movably installed inside the arc groove, a limiting block is welded on the arc plate, and the limiting block cooperates with the connecting plate.

[0009] Furthermore, a connecting column is fixed on the inner wall of the opening, a fixing hole is opened on the inner wall of the arc-shaped plate, a reset mechanism is fixedly installed inside the fixing hole, and one end of the reset mechanism is fixed on the connecting column.

[0010] Furthermore, a control box is fixedly installed inside the mounting seat, a support column is fixed inside the slot, one end of the support column is fixed to one end of the fixed column, a water level monitoring sensor is fixedly installed on the fixed column, the water level monitoring sensor cooperates with the arc block, and a retaining ring is fixed on the support column.

[0011] Furthermore, a connecting pipe is fixed on the inner wall of the movable plate, a limiting ring is fixedly installed on the upper part of the connecting pipe, and the limiting ring cooperates with the clamping ring.

[0012] Furthermore, a positioning column is fixed on the inner wall of the groove, a pushing mechanism is movably mounted on the positioning column, and the pushing mechanism is movably connected to one end of the positioning column and a connecting pipe.

[0013] Furthermore, a supporting mechanism is fixed inside the slide groove, the sliding block is movably installed inside the slide groove, and one end of the supporting mechanism is fixed on the sliding block.

[0014] The method for using a water level meter for monitoring waterlogging according to claim 1 comprises the following steps:

[0015] Step 1: Drill holes on the selected curbstone with a water drill, discharge the debris inside the hole after drilling, slide the shielding plate to one side to expose the adjusting bolt, and push the bottom of the support plate downward to lift the mounting seat. When the support plate descends, the connecting plate loses the limit on the curved plate, and the reset mechanism pushes the curved plate to be exposed from the inside of the opening. After the curved plate contacts the drilled hole from both sides, it supports the mounting seat as a whole, so that the mounting seat is suspended and installed in the use position. Later, adjust the height of the mounting seat from the ground according to the exposed length of the bottom of the support plate;

[0016] Step 2: Push the movable plate later, and the movable plate moves on the fixed column and the support column. After the support column enters the opening, it pushes the dust accumulated inside the opening outward. While pushing, the fixed column moves on the arc block, and the arc block cleans the dust on the surface of the water level monitoring sensor to avoid the impact caused by dust adhering to the water level monitoring sensor. In addition, after the movable plate is pulled outward, the movable plate is separated from the inside of the slot. After separation, the slot is opened to facilitate the maintenance and replacement of the internal equipment;

[0017] Step three: The arc plate expands outward under the push of the reset mechanism. The expansion allows the entire device to be installed inside drilled holes of different diameters. Later, the fixing seat and the mounting seat are directly pulled upward. After pulling, the mounting seat can be quickly separated from the inside of the drilled hole. When in use, the arc plate and the support plate provide three-point support for the mounting seat. The three-point support improves the installation stability of the mounting seat. In addition, the arc plate and the support plate cooperate to perform double support adjustment on the overall installation position and height of the mounting seat.

[0018] Beneficial effects of the present invention: A water level meter for monitoring waterlogging of the present invention includes a fixing seat; a baffle plate; a mounting seat; a slot; a movable plate; an opening; an arc plate; an adjusting bolt; an opening; a fixing column; an arc block; a slide groove; a switch; a supporting mechanism; a slider; a control box; a fixing groove; a supporting plate; an arc groove; a connecting plate; a fixing hole; a reset mechanism; a connecting column; a limit block; a threaded column; a bearing seat; a supporting column; a water level monitoring sensor; a retaining ring; a connecting pipe; a positioning column; and a pushing mechanism.

[0019] 1. This water level gauge for monitoring waterlogging pushes the bottom of the support plate downward by adjusting the bolts, and the movement cushions the mounting seat, which saves the inconvenience of supporting the mounting seat with debris in the later stage. When the support plate descends, the connecting plate loses the limit on the arc plate, and the reset mechanism pushes the arc plate to be exposed from the inside of the opening. After the arc plate contacts the drilled hole from both sides, it supports the mounting seat as a whole, so that the mounting seat is suspended and installed in the use position. The height of the mounting seat from the ground is adjusted in the later stage according to the exposed length of the bottom of the support plate.

[0020] 2. This kind of water level gauge for monitoring waterlogging, in the later stage, pushes the movable plate by the impact of water, and the movable plate moves on the fixed column and the supporting column. After the supporting column enters into the opening, it pushes the dust accumulated inside the opening outward. While pushing, the fixed column moves on the arc block, and the arc block cleans the dust on the surface of the water level monitoring sensor to avoid the influence caused by the dust adhering to the water level monitoring sensor. In addition, after the movable plate is pulled outward, the movable plate is separated from the inside of the groove. After separation, the groove is opened to facilitate the maintenance and replacement of the internal equipment.

[0021] 3. In this water level gauge for monitoring waterlogging, the arc plate expands outwards under the push of the reset mechanism. The expansion allows the entire device to be installed inside drilled holes of different apertures. Later, the fixing seat and the mounting seat are directly pulled upwards. After pulling, the mounting seat can be quickly separated from the inside of the drilled hole. When in use, the arc plate and the support plate provide three-point support for the mounting seat, which improves the installation stability of the mounting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a water level meter for monitoring waterlogging according to the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of a water level gauge for monitoring waterlogging according to the present invention after the movable plate is moved;

[0024] Figure 3 It is a structural schematic diagram of an enlarged point A of a water level gauge for monitoring waterlogging according to the present invention;

[0025] Figure 4 It is a structural schematic diagram of a chute of a water level gauge for monitoring waterlogging in the present invention;

[0026] Figure 5 It is a schematic diagram of a top view cross-sectional structure of a mounting base of a water level gauge for monitoring waterlogging according to the present invention;

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of an arc plate of a water level gauge for monitoring waterlogging in the present invention;

[0028] Figure 7 It is a schematic diagram of the side cross-sectional structure of a mounting base of a water level gauge for monitoring waterlogging according to the present invention;

[0029] In the figure: 1. fixing seat; 2. shielding plate; 3. mounting seat; 4. slot; 5. movable plate; 6. opening; 7. arc plate; 8. adjusting bolt; 9. opening; 10. fixing column; 11. arc block; 12. slide groove; 13. switch; 14. supporting mechanism; 15. slider; 16. control box; 17. fixing groove; 18. supporting plate; 19. arc groove; 20. connecting plate; 21. fixing hole; 22. reset mechanism; 23. connecting column; 24. limit block; 25. threaded column; 26. bearing seat; 27. supporting column; 28. water level monitoring sensor; 29. ​​retaining ring; 30. connecting pipe; 31. positioning column; 32. pushing mechanism. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] See also Figures 1 to 7 The present invention provides a technical solution: a water level gauge for monitoring waterlogging, comprising a water level gauge body, the water level gauge body comprising a fixing seat 1, a fixing seat 3 is fixedly installed at the bottom of the fixing seat 1, a slot 4 is provided on the fixing seat 3, a movable plate 5 is movably installed inside the slot 4, an opening 9 is provided on the movable plate 5, a fixing column 10 is movably installed inside the opening 9, an arc block 11 is movably installed on the top of the fixing column 10, one end of the arc block 11 is fixed on the inner wall of the opening 9, an opening 6 is provided on the side of the fixing seat 3, an arc plate 7 is movably installed inside the opening 6, a fixing groove 17 is provided on one side of the fixing seat 1, a support plate 18 is movably installed inside the fixing groove 17, and the descent of the support plate 18 provides suspended support for the entire device from the bottom of the fixing seat 3.

[0032] In this embodiment, a baffle plate 2 is movably installed on the top of the fixed seat 1, a slider 15 is fixed on the inner wall of the baffle plate 2, a slide groove 12 is opened on the fixed seat 1, and an adjusting bolt 8 and a switch 13 are respectively installed on the fixed seat 1, the adjusting bolt 8 includes a threaded column 25, one end of the threaded column 25 is installed on the top of the support plate 18 through a bearing seat 26, an arc groove 19 is opened between the fixed groove 17 and the opening 6, a connecting plate 20 is movably installed inside the arc groove 19, a limiting block 24 is welded on the arc plate 7, the limiting block 24 cooperates with the connecting plate 20, and the threaded column 25 is driven to rotate by the adjusting bolt 8, and the threaded column 25 rotates to push the support plate 18 to move up and down inside the fixed groove 17, and the up and down movement of the support plate 18 adjusts the exposed length of the bottom of the support plate 18.

[0033] In this embodiment, a connecting column 23 is fixed on the inner wall of the opening 6, a fixing hole 21 is opened on the inner wall of the arc plate 7, a reset mechanism 22 is fixedly installed inside the fixing hole 21, the reset mechanism 22 is a reset spring, the reset spring pushes the arc plate 7 to move outward, and the arc plate 7 contacts the inner wall of the drilled hole after moving to provide support and limit for the mounting seat 2, one end of the reset mechanism 22 is fixed on the connecting column 23, a control box 16 is fixedly installed inside the mounting seat 2, a support column 27 is fixed inside the slot 4, one end of the support column 27 is fixed to one end of the fixed column 10, a water level monitoring sensor 28 is fixedly installed on the fixed column 10, the water level monitoring sensor 28 cooperates with the arc block 11, a retaining ring 29 is fixed on the support column 27, the water level monitoring sensor 28 monitors the water level depth, and uploads the water depth to the repeater at a regular time through the LORA network, and the repeater reports the water depth through the 4G network.

[0034] In this embodiment, a connecting tube 30 is fixed on the inner wall of the movable plate 5, and a limiting ring is fixedly installed on the upper part of the connecting tube 30, and the limiting ring cooperates with the clamping ring 29, and a positioning column 31 is fixed on the inner wall of the slot 4, and a pushing mechanism 32 is movably installed on the positioning column 31, and one end of the pushing mechanism 32 and the positioning column 31 are movably connected to the connecting tube 30, and a supporting mechanism 14 is fixed inside the slide groove 12, and the slider 15 is movably installed inside the slide groove 12, and one end of the supporting mechanism 14 is fixed on the slider 15, and the pushing mechanism 32 and the supporting mechanism 14 are both spring structures, and the supporting mechanism 14 pushes the slider 15 to move to the center position of the slide groove 12, and the slider 15 drives the shielding plate 2 to shield and seal the adjusting bolt 8 and the switch 13.

[0035] The method for using a water level meter for monitoring waterlogging according to claim 1 comprises the following steps:

[0036] Step 1: Drill holes on the selected curbstone with a water drill, discharge the debris inside the hole after drilling, slide the shielding plate to one side to expose the adjusting bolt, and push the bottom of the support plate downward to lift the mounting seat. When the support plate descends, the connecting plate loses the limit on the curved plate, and the reset mechanism pushes the curved plate to be exposed from the inside of the opening. After the curved plate contacts the drilled hole from both sides, it supports the mounting seat as a whole, so that the mounting seat is suspended and installed in the use position. Later, adjust the height of the mounting seat from the ground according to the exposed length of the bottom of the support plate;

[0037] Step 2: Push the movable plate later, and the movable plate moves on the fixed column and the support column. After the support column enters the opening, it pushes the dust accumulated inside the opening outward. While pushing, the fixed column moves on the arc block, and the arc block cleans the dust on the surface of the water level monitoring sensor to avoid the impact caused by dust adhering to the water level monitoring sensor. In addition, after the movable plate is pulled outward, the movable plate is separated from the inside of the slot. After separation, the slot is opened to facilitate the maintenance and replacement of the internal equipment;

[0038] Step three: The arc plate expands outward under the push of the reset mechanism. The expansion allows the entire device to be installed inside drilled holes of different diameters. Later, the fixing seat and the mounting seat are directly pulled upward. After pulling, the mounting seat can be quickly separated from the inside of the drilled hole. When in use, the arc plate and the support plate provide three-point support for the mounting seat. The three-point support improves the installation stability of the mounting seat. In addition, the arc plate and the support plate cooperate to perform double support adjustment on the overall installation position and height of the mounting seat.

[0039] When the device is in use, a hole is drilled at the installation position first, and a hole is drilled on the selected curbstone by a water drill. After drilling, the debris inside the hole is discharged, and the shielding plate 2 is slid to one side to expose the adjusting bolt 8, and the adjusting bolt 8 is rotated by a tool. The adjusting bolt 8 drives the threaded column 25 to rotate during the rotation, and the threaded column 25 moves downward when the adjusting bolt 8 is rotated. The threaded column 25 moves downward when the rotating state, and the threaded column 25 pushes one end of the support plate 18 to be exposed from the bottom of the mounting seat 3, and the support of the bottom of the mounting seat 3 is achieved by the support plate 18, so that the mounting seat 3 is installed in a cushioned manner, and the support plate 18 is at the bottom. When the connecting plate 20 is lowered, the limit of the arc plate 7 is lost, and the reset mechanism 22 pushes the arc plate 7 to be exposed from the inside of the opening 6. The arc plate 7 contacts the drilled hole from both sides to support the mounting seat 3 as a whole, so that the mounting seat 3 is suspended and installed in the use position. Later, the height of the mounting seat 3 from the ground is adjusted by adjusting the length of the bottom of the support plate 18 exposed by the rotation of the adjusting bolt 8 and the threaded column 25. The arc plate 7 expands outward under the push of the reset mechanism 22. The expansion allows the device to be installed in the inside of drilled holes with different apertures. Later, the fixing seat 1 and the mounting seat 3 are directly pulled upward. After being pulled, the mounting seat 3 can be pulled out of the drilled hole. The interior of the mounting base is quickly separated, and when in use, the arc plate 7 and the support plate 18 realize three-point support for the mounting base, and the three-point support improves the installation stability of the mounting base 3 to avoid shaking caused by the mounting base 3 being padded by debris in the later stage. When in use, the position of the slot 4 is in the same plane as the side of the curbstone, and the drilling detection is provided with a water inlet. After water is stored on the road surface, the water moves to the side to the curbstone, and the water enters the fixed column 10 through the opening 9. When in use, when a car passes on the road surface, the water surface will turn to form waves to impact the movable plate 5, and the movable plate 5 moves on the fixed column 10 and the support column 27 under the impact, and the movable plate 5 moves on the fixed column 10 and the support column 27. When the plate 5 moves, the arc block 11 moves on the fixed column 10, and the arc block 11 cleans the dust on the surface of the water level monitoring sensor 28 to avoid the influence caused by the dust adhering to the water level monitoring sensor 28. In addition, the support column 27 pushes the dust accumulated inside the opening 9 outward, and as the movable plate 5 moves more and more, the dust is gradually pushed out and cleaned from the inside of the opening 9. In addition, after the movable plate 5 is pulled outward, the limit ring on the connecting pipe 30 is separated from the clamping ring 29 on the support column 27, and the movable plate 5 is disassembled after separation. After the movable plate 5 is disassembled, the slot 4 is opened to facilitate the maintenance and replacement of the internal equipment.

[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A water level gauge for monitoring waterlogging, comprising a water level gauge body, characterized in that: The water level gauge body comprises a fixing seat (1), a fixing seat (3) is fixedly mounted on the bottom of the fixing seat (1), a slot (4) is formed on the fixing seat (3), a movable plate (5) is movably mounted inside the slot (4), an opening (9) is formed on the movable plate (5), a fixing column (10) is movably mounted inside the opening (9), an arc block (11) is movably mounted on the top of the fixing column (10), one end of the arc block (11) is fixed to the inner wall of the opening (9), an opening (6) is formed on the side of the fixing seat (3), a arc plate (7) is movably mounted inside the opening (6), a fixing slot (17) is formed on one side of the fixing seat (1), and the fixing slot A support plate (18) is movably installed inside the fixing seat (17), a baffle plate (2) is movably installed on the top of the fixing seat (1), a slider (15) is fixed on the inner wall of the baffle plate (2), a slide groove (12) is opened on the fixing seat (1), an adjusting bolt (8) and a switch (13) are respectively installed on the fixing seat (1), the adjusting bolt (8) comprises a threaded column (25), one end of the threaded column (25) is installed on the top of the support plate (18) through a bearing seat (26), an arc groove (19) is opened between the fixing groove (17) and the opening (6), a connecting plate (20) is movably installed inside the arc groove (19), and a limiting block (24) is welded on the arc plate (7). ), the limit block (24) cooperates with the connecting plate (20), a connecting column (23) is fixed on the inner wall of the opening (6), a fixing hole (21) is opened on the inner wall of the arc plate (7), a reset mechanism (22) is fixedly installed inside the fixing hole (21), one end of the reset mechanism (22) is fixed on the connecting column (23), a control box (16) is fixedly installed inside the mounting seat (3), a support column (27) is fixed inside the slot (4), one end of the support column (27) is fixed to one end of the fixing column (10), a water level monitoring sensor (28) is fixedly installed on the fixing column (10), and the water level monitoring sensor (28) is connected to the arc block (1 1), a clamping ring (29) is fixed on the support column (27), a connecting tube (30) is fixed on the inner wall of the movable plate (5), a limiting ring is fixedly installed on the upper part of the connecting tube (30), the limiting ring cooperates with the clamping ring (29), a positioning column (31) is fixed on the inner wall of the slot (4), a pushing mechanism (32) is movably installed on the positioning column (31), one end of the pushing mechanism (32) and the positioning column (31) are movably connected to the connecting tube (30), a supporting mechanism (14) is fixed inside the slide groove (12), the sliding block (15) is movably installed inside the slide groove (12), and one end of the supporting mechanism (14) is fixed on the sliding block (15).

2. The method for using a water level gauge for monitoring waterlogging according to claim 1, characterized in that: The following steps are involved: Step 1: Drill holes on the selected curbstone with a water drill, discharge the debris inside the hole after drilling, slide the shielding plate to one side to expose the adjusting bolt, and push the bottom of the support plate downward to lift the mounting seat. When the support plate descends, the connecting plate loses the limit on the curved plate, and the reset mechanism pushes the curved plate to be exposed from the inside of the opening. After the curved plate contacts the drilled hole from both sides, it supports the mounting seat as a whole, so that the mounting seat is suspended and installed in the use position. Later, adjust the height of the mounting seat from the ground according to the exposed length of the bottom of the support plate; Step 2: Push the movable plate later, and the movable plate moves on the fixed column and the support column. After the support column enters the opening, it pushes the dust accumulated inside the opening outward. While pushing, the fixed column moves on the arc block, and the arc block cleans the dust on the surface of the water level monitoring sensor to avoid the impact caused by dust adhering to the water level monitoring sensor. In addition, after the movable plate is pulled outward, the movable plate is separated from the inside of the slot. After separation, the slot is opened to facilitate the maintenance and replacement of the internal equipment; Step three: The arc plate expands outward under the push of the reset mechanism. The expansion allows the entire device to be installed inside drilled holes of different diameters. Later, the fixing seat and the mounting seat are directly pulled upward. After pulling, the mounting seat can be quickly separated from the inside of the drilled hole. When in use, the arc plate and the support plate provide three-point support for the mounting seat. The three-point support improves the installation stability of the mounting seat. In addition, the arc plate and the support plate cooperate to perform double support adjustment on the overall installation position and height of the mounting seat.

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