Outlet water treatment device and treatment method for tunnel karst
By designing a liftable suction pipe and a water outlet treatment device with built-in scraper, the problem of impurities sealing in karst water is solved, and efficient water treatment and water pumping efficiency are achieved.
Patent Information
- Application Number
- CN202411847626.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2044-12-16
AI Technical Summary
During the tunnel construction process, the karst effluent water contains a large amount of sludge and water influx impurities, which leads to the easy sealing of the extraction pipe and affecting the processing efficiency.
A water effluent treatment device for tunnel karst is designed, including a liftable suction pipe, a built-in rotatable scraper and a stirring plate. Through the lifting and lowering of the suction pipe and the rotation of the scraper, the water absorption holes are cleaned to prevent impurities from being blocked; at the same time, the agitating plate stirs the water body during the drainage process, crushes impurities, and improves the treatment efficiency.
It effectively improves the water pumping efficiency, reduces the risk of impurity sealing, improves the water treatment effect, and ensures efficient treatment of karst water during tunnel construction.
Smart Images

Figure CN119754849A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a water treatment device and a treatment method for tunnel karst. Background Art
[0002] During the tunnel construction process, karst water often emerges, which usually causes serious damage to underground projects. The current common karst water treatment method is mainly to pump water through a pump and discharge the karst water. However, since karst water is accompanied by a large amount of mud and water impurities, the extraction pipe is easily blocked, thereby affecting the treatment efficiency. Therefore, this technical solution proposes a karst water treatment device to solve the above problem. Summary of the invention
[0003] The purpose of the present invention is to provide a water treatment device and a treatment method for tunnel karst to solve the above-mentioned problems and to achieve the purpose of improving the pumping efficiency and enhancing the water treatment effect.
[0004] To achieve the above object, the present invention provides the following solution: a water treatment device for tunnel karst, comprising:
[0005] Body;
[0006] a water suction pipe configured to be raised and lowered relative to the machine body;
[0007] A plurality of scrapers are rotatably connected in the water suction pipe and are in sliding contact with the inner wall surface of the water suction pipe. A plurality of water suction holes are opened on the side wall surface of the water suction pipe, and the scrapers are configured to intermittently pass through the water suction holes;
[0008] a bottom plate, arranged at the bottom end of the water suction pipe, and configured to be raised and lowered relative to the water suction pipe to rotate the plurality of scrapers;
[0009] A plurality of paddles are rotatably matched with the bottom plate and are used for stirring the karst water.
[0010] Preferably, it also includes:
[0011] A transmission rod is fixedly connected to the top surface of the bottom plate, one end of the transmission rod extends into the water suction pipe and is fixedly connected to the top plate, and the transmission rod is limitedly slidably connected with the water suction pipe;
[0012] At least one pair of small balls are relatively fixed to the side wall of the top plate;
[0013] A transmission sleeve is sleeved outside the top plate, and limiting grooves are respectively provided on opposite sides of the inner wall of the transmission sleeve, and the small ball is slidably connected with the adjacent limiting grooves. When the transmission rod is lifted or lowered relative to the water suction pipe, the transmission sleeve reciprocates relative to the water suction pipe through the cooperation of the small ball and the limiting groove;
[0014] Wherein, a plurality of scrapers are axially arranged on the transmission sleeve and fixed relative to the transmission sleeve.
[0015] Preferably, it also includes:
[0016] A first adapter ring is sleeved and fixedly connected to the outer peripheral side of the transmission sleeve, and the bottom surface of the first adapter ring is connected to the inner wall of the bottom end of the water suction pipe through a sliding bearing;
[0017] A plurality of support rods, the number of which is the same as that of the scrapers and which are fixedly connected one by one, wherein the plurality of support rods are fixedly connected to the first adapter ring at equal intervals in the vertical direction;
[0018] The second adapter ring is arranged at the top end of the support rod and is fixedly connected to a plurality of the support rods.
[0019] Preferably, it also includes:
[0020] A spring is wound around the portion of the transmission rod located in the water suction pipe, and two ends of the spring are respectively fixedly connected to the top plate and the inner wall of the bottom end of the water suction pipe.
[0021] Preferably, it also includes:
[0022] A housing, fixedly connected to the top surface of the bottom plate;
[0023] The driving motor is fixed in the housing, the output shaft of the driving motor is fixedly connected to a rotating shaft, the outer circumference of the rotating shaft is sleeved and fixedly provided with a connecting ring, and a plurality of the shifting plates are fixedly connected to the connecting ring at equal axial intervals.
[0024] Preferably, the rotating shaft is a sealed rotating shaft.
[0025] Preferably, it also includes:
[0026] A pair of mounting plates are fixedly connected to the machine body, a through hole is opened on the machine body between the pair of mounting plates, and the water suction pipe is passed through the through hole;
[0027] A pair of cylinders are respectively fixed on a pair of mounting plates, the top ends of the pair of cylinders are respectively fixedly connected with fixing plates, a clamping ring is integrally formed between the pair of fixing plates, and the clamping ring is sleeved on the water suction pipe and fixed to the water suction pipe.
[0028] Preferably, it also includes:
[0029] The pump is arranged at the top of the water suction pipe, the water outlet of the pump is connected with a connecting pipe, one end of the connecting pipe away from the pump is fixed on the machine body, and the connecting pipe is used to connect with an external water treatment mechanism.
[0030] Preferably, the bottom surface of the bottom plate is fixed with anti-slip grooves.
[0031] A method for treating water outlet in tunnel karst, according to the above-mentioned device for treating water outlet in tunnel karst, further comprising the following steps:
[0032] Move the machine to the karst water outlet location;
[0033] Lower the suction pipe until the karst water covers the suction hole, and then start the pump to discharge the karst water;
[0034] During the drainage process, the suction pipe is intermittently raised and lowered, so that the transmission rod is reciprocatedly raised and lowered relative to the suction pipe;
[0035] The ball and the transmission sleeve are limited and slidably connected, so that the transmission sleeve drives a number of scrapers to reciprocate and scrape the water absorption holes;
[0036] When draining water, the driving motor is started to rotate several paddles to stir the karst water.
[0037] Compared with the prior art, the present invention has the following advantages and technical effects:
[0038] The present invention arranges a water suction pipe to be lifted and lowered relative to a machine body, and arranges a plurality of rotatable scrapers in the water suction pipe. During the process of the water suction pipe sucking karst water, the bottom plate at the bottom end of the water suction pipe is lifted and lowered relative to the water suction pipe, so that the plurality of scrapers can be driven to slide in contact with the inner wall surface of the water suction pipe and intermittently pass through the water suction holes, thereby effectively maintaining the effect of sucking water, reducing the situation in which the water treatment efficiency is affected by the clogging of the water suction holes by karst water impurities, and realizing the improvement of water treatment efficiency. At the same time, a plurality of rotatably connected paddle plates are also arranged on the bottom plate. During the process of discharging karst water, the paddle plates stir the water to mix and crush the impurities in the water, thereby further accelerating the water treatment efficiency and ensuring the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:
[0040] Figure 1 It is a structural schematic diagram of the overall device;
[0041] Figure 2 This is the position relationship diagram of the suction pipe and the bottom plate;
[0042] Figure 3 is a position relationship diagram of the rotating shaft and the connecting ring;
[0043] Figure 4This is the structural explosion diagram of the ball and the transmission sleeve;
[0044] Among them, 1. body; 2. suction pipe; 3. scraper; 4. bottom plate; 5. paddle plate; 6. transmission rod; 7. limit rod; 8. top plate; 9. small ball; 10. transmission sleeve; 11. first adapter ring; 12. support rod; 13. second adapter ring; 14. spring; 15. housing; 16. drive motor; 17. rotating shaft; 18. connecting ring; 19. mounting plate; 20. cylinder; 21. fixing plate; 22. retaining ring; 23. pump; 24. connecting pipe; 25. anti-skid pattern; 26. universal wheel; 27. sliding bearing. DETAILED DESCRIPTION
[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0047] Example: Refer to Figure 1-Figure 4 , a water treatment device for tunnel karst, comprising:
[0048] Body 1;
[0049] The water suction pipe 2 is configured to be raised and lowered relative to the machine body 1;
[0050] A plurality of scrapers 3 are rotatably connected in the water suction pipe 2 and are in sliding contact with the inner wall surface of the water suction pipe 2. A plurality of water suction holes are opened on the side wall surface of the water suction pipe 2, and the scrapers 3 are configured to intermittently pass through the water suction holes;
[0051] a bottom plate 4, arranged at the bottom end of the water suction pipe 2, and configured to be raised and lowered relative to the water suction pipe 2 to rotate the plurality of scrapers 3;
[0052] A plurality of paddles 5 are rotatably engaged with the bottom plate 4 and are used for stirring the karst water.
[0053] The present invention sets the water suction pipe 2 to be lifted and lowered relative to the machine body 1, and arranges a plurality of rotatable scrapers 3 in the water suction pipe 2. During the process of the water suction pipe 2 sucking karst water, the bottom plate 4 at the bottom end of the water suction pipe 2 is lifted and lowered relative to the water suction pipe 2, so that the plurality of scrapers 3 can be driven to slide in contact with the inner wall surface of the water suction pipe 2 and intermittently pass through the water suction holes, thereby effectively maintaining the effect of sucking water, reducing the situation in which the water treatment efficiency is affected by the clogging of the water suction holes by karst water impurities, and realizing the improvement of water treatment efficiency. At the same time, a plurality of rotatably connected paddle plates 5 are also arranged on the bottom plate 4. During the process of discharging karst water, the paddle plates 5 stir the water to mix and crush the sludge impurities in the water, further accelerating the water treatment efficiency and ensuring the treatment effect.
[0054] Furthermore, it also includes:
[0055] The transmission rod 6 is fixedly connected to the top surface of the bottom plate 4, one end of the transmission rod 6 extends into the water suction pipe 2 and is fixedly connected to the top plate 8, and the transmission rod 6 is limitedly slidably connected with the water suction pipe 2;
[0056] At least one pair of small balls 9 are fixedly connected to the side wall of the top plate 8;
[0057] The transmission sleeve 10 is sleeved outside the top plate 8. The inner wall surface of the transmission sleeve 10 has limit grooves on opposite sides. The small ball 9 is in sliding contact with the adjacent limit grooves. When the transmission rod 6 is lifted or lowered relative to the water suction pipe 2, the transmission sleeve 10 reciprocates relative to the water suction pipe 2 through the cooperation of the small ball 9 and the limit groove.
[0058] Among them, a plurality of scrapers 3 are axially arranged on the transmission sleeve 10 and fixed relative to the transmission sleeve 10 .
[0059] Reference Figure 2 , Figure 4 By fixing the limiting rod 7 on the side wall of the transmission rod 6, the bottom end of the water suction pipe 2 is limitedly slidably connected with the transmission rod 6 to prevent the transmission rod 6 and the water suction pipe 2 from rotating relative to each other. During the water absorption process, the water suction pipe 2 is lowered to make the bottom plate 4 abut against the inner wall of the karst pit, thereby lifting relative to the water suction pipe 2. During the lifting process, the small ball 9 slides along the limiting groove. Since the transmission rod 6 does not rotate with the water suction pipe 2, the transmission sleeve 10 rotates under the pressure of the small ball 9, thereby driving a number of scrapers 5 to rotate to clean the water suction holes, thereby improving the water absorption efficiency. During the lifting process of the water suction pipe 2, the bottom plate 4 is lowered by gravity, and the small ball 9 squeezes the transmission sleeve 10 to reset, thereby driving a number of scrapers 3 to rotate back and forth during the lifting process of the water suction pipe 2, thereby reducing the possibility of the water suction holes being blocked.
[0060] Furthermore, it also includes:
[0061] The first adapter ring 11 is sleeved and fixedly connected to the outer peripheral side of the transmission sleeve 10, and the bottom surface of the first adapter ring 11 is connected to the inner wall of the bottom end of the water suction pipe 2 through the sliding bearing 27;
[0062] A plurality of support rods 12, the number of which is the same as that of the scraper blades 3 and which are fixedly connected one by one, and the plurality of support rods 12 are fixedly connected to the first adapter ring 11 at equal intervals in the axial direction in the vertical direction;
[0063] The second adapter ring 13 is disposed on the top of the support rod 12 and is fixedly connected to a plurality of support rods 12 .
[0064] The scrapers 3 are fixedly connected to the first adapter ring 11 and the second adapter ring 13 through a plurality of support rods 12, respectively. The scrapers 3 are fixedly connected to the side of the support rods 12 close to the inner wall of the suction pipe 2, thereby improving the structural integrity of the scrapers 3. The bottom end of the first adapter ring 11 is rotatably connected to the suction pipe 2 through a sliding bearing 27, thereby ensuring the rotation effect of the first adapter ring 11.
[0065] Furthermore, it also includes;
[0066] The spring 14 is wound around the portion of the transmission rod 6 located inside the water suction pipe 2, and the two ends of the spring 14 are fixedly connected to the top plate 8 and the inner wall of the bottom end of the water suction pipe 2 respectively.
[0067] By winding a spring 14 around the transmission rod 6 and fixing both ends of the spring 14 to the top plate 8 and the inner wall of the bottom end of the suction pipe 2, the reset function of the bottom plate 4 is guaranteed and the transmission effect of the ball 9 and the transmission sleeve 10 is improved.
[0068] Furthermore, it also includes:
[0069] The housing 15 is fixedly connected to the top surface of the bottom plate 4, and the power transmission rod 6 is fixedly connected to the top surface of the housing 15;
[0070] The driving motor 16 is fixed in the housing 15 . The output shaft of the driving motor 16 is fixedly connected to a rotating shaft 17 . A connecting ring 18 is sleeved and fixedly connected to the outer circumference of the rotating shaft 17 . A plurality of shifting plates 5 are fixedly connected to the connecting ring 18 at equal axial intervals.
[0071] Furthermore, the rotating shaft 17 is a sealed rotating shaft.
[0072] Reference Figure 3 The rotating shaft 17 is driven to rotate by the driving motor 16, and the rotating shaft 17 drives the connecting ring 18 to rotate a plurality of paddles 5. It can be understood that the paddles 5 are spiral plate structures, thereby enhancing the stirring effect on the karst water.
[0073] Furthermore, it also includes:
[0074] A pair of mounting plates 19 are fixedly connected to the machine body 1. A through hole is provided on the machine body 1 between the pair of mounting plates 19, and the water suction pipe 2 is passed through the through hole.
[0075] A pair of cylinders 20 are fixed on a pair of mounting plates 19 respectively. The top ends of the pair of cylinders 20 are fixedly connected with fixing plates 21 respectively. A clamping ring 22 is integrally formed between the pair of fixing plates 21 . The clamping ring 22 is sleeved on the water suction pipe 2 and fixed to the water suction pipe 2 .
[0076] The cylinder 20 drives the fixing plate 21 and the clamping ring 22 to rise and fall, thereby causing the water suction pipe 2 to rise and fall, which not only improves the applicable scope of water suction, but also can act on the lifting of the water suction pipe 2 and adjust the state of the bottom plate 4 against the ground. By controlling the lifting of the bottom plate 4 relative to the water suction pipe 2, the reciprocating rotation of the transmission sleeve 10 is achieved, thereby ensuring the cleaning effect of the water suction hole.
[0077] Furthermore, it also includes:
[0078] The pump 23 is arranged at the top of the water suction pipe 2. The water outlet of the pump 23 is connected with a connecting pipe 24. The end of the connecting pipe 24 away from the pump 23 is fixed on the body 1. The connecting pipe 24 is used to connect with an external water treatment mechanism.
[0079] Furthermore, the bottom surface of the bottom plate 4 is fixed with anti-skid grooves 25 to enhance the stability of the bottom plate 4 when in contact with the ground.
[0080] The pump 23 is connected to the water suction pipe 2, and the connecting pipe 24 is connected to the outlet pipe of the pump 23. The connecting pipe 24 is used to directly connect to an external water treatment mechanism to further improve the treatment capacity and efficiency of karst water treatment. The external water treatment mechanism is a common water circulation filtration system or a water storage sedimentation tank, which is the prior art and will not be described in detail.
[0081] A method for treating water outlet in tunnel karst, according to the above-mentioned device for treating water outlet in tunnel karst, further comprising the following steps:
[0082] Move body 1 to the karst water outlet position;
[0083] Lower the water suction pipe 2 until the karst water covers the water suction hole, and then start the pump 23 to discharge the karst water;
[0084] During the drainage process, the suction pipe 2 is intermittently raised and lowered, so that the transmission rod 6 is reciprocatedly raised and lowered relative to the suction pipe 2;
[0085] The ball 9 is limited and slidably connected with the transmission sleeve 10, so that the transmission sleeve 10 drives the scrapers 3 to reciprocate and scrape the water absorption holes;
[0086] When draining water, the driving motor 16 is started to rotate a plurality of paddles 5 to stir the karst water.
[0087] The working process of this embodiment is as follows:
[0088] By installing universal wheels 26 around the bottom end of the body 1 and moving the body 1 to the karst water outlet position, the cylinder 20 is lowered to make the bottom plate 4 against the ground, thereby squeezing the transmission rod 6 to lift. During the lifting of the transmission rod 6, the scraper 3 can scrape the water absorption hole to ensure the subsequent water absorption effect. At the same time, during the water absorption and discharge process, the water absorption pipe 2 can also be raised and lowered by the cylinder 20, and the bottom plate 4 is supported by the spring 14, so that the bottom plate 4 is reciprocated relative to the water absorption pipe 2, and a number of scrapers 3 are reciprocated to fully clean the water absorption hole, thereby improving the water treatment efficiency. In addition, during the water absorption process, the driving motor 16 rotates a number of paddles 5 to stir the karst water, mix and stir the mud and impurities in the karst water, and further ensure the water absorption effect.
[0089] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0090] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. A water treatment device for tunnel karst, characterized in that: include: Body (1); A water suction pipe (2) configured to be raised and lowered relative to the machine body (1); A plurality of scrapers (3) are rotatably connected in the water suction pipe (2) and are in sliding contact with the inner wall surface of the water suction pipe (2); a plurality of water suction holes are opened on the side wall surface of the water suction pipe (2), and the scrapers (3) are configured to intermittently pass through the water suction holes; A bottom plate (4) is arranged at the bottom end of the water suction pipe (2) and is configured to be raised and lowered relative to the water suction pipe (2) to rotate the plurality of scrapers (3); A plurality of paddles (5) are rotatably engaged with the bottom plate (4) and are used to stir the karst water.
2. The water treatment device for tunnel karst according to claim 1, characterized in that: Also includes: A transmission rod (6) is fixedly connected to the top surface of the bottom plate (4), one end of the transmission rod (6) extends into the water suction pipe (2) and is fixedly connected to a top plate (8), and the transmission rod (6) and the water suction pipe (2) are limitedly slidably connected; At least one pair of small balls (9) are relatively fixed to the side wall surface of the top plate (8); A transmission sleeve (10) is sleeved outside the top plate (8), and limiting grooves are respectively provided on opposite sides of the inner wall surface of the transmission sleeve (10), and the small ball (9) is slidably connected with adjacent limiting grooves. When the transmission rod (6) is lifted or lowered relative to the water suction pipe (2), the transmission sleeve (10) reciprocates relative to the water suction pipe (2) through the cooperation of the small ball (9) and the limiting groove; Wherein, a plurality of the scrapers (3) are axially arranged on the transmission sleeve (10) and fixed relative to the transmission sleeve (10).
3. The water treatment device for tunnel karst according to claim 2, characterized in that: Also includes: A first adapter ring (11) is sleeved and fixedly connected to the outer peripheral side of the transmission sleeve (10), and the bottom surface of the first adapter ring (11) is connected to the inner wall of the bottom end of the water suction pipe (2) via a sliding bearing (27); A plurality of support rods (12), the number of which is the same as that of the scraper (3) and which are fixedly connected one by one, and the plurality of support rods (12) are fixedly connected to the first adapter ring (11) at equal intervals in the axial direction in the vertical direction; The second adapter ring (13) is arranged at the top end of the support rod (12) and is fixedly connected to a plurality of the support rods (12).
4. The effluent treatment device for tunnel karst according to claim 2, characterized in that: Also includes; A spring (14) is wound around the portion of the transmission rod (6) located inside the water suction pipe (2), and two ends of the spring (14) are respectively fixedly connected to the top plate (8) and the inner wall of the bottom end of the water suction pipe (2).
5. The water treatment device for tunnel karst according to claim 1, characterized in that: Also includes: A housing (15) fixedly connected to the top surface of the bottom plate (4); The drive motor (16) is fixedly connected in the housing (15); the output shaft of the drive motor (16) is fixedly connected to a rotating shaft (17); a connecting ring (18) is sleeved and fixedly connected to the outer circumference of the rotating shaft (17); and a plurality of the shifting plates (5) are fixedly connected to the connecting ring (18) at equal axial intervals.
6. The effluent treatment device for tunnel karst according to claim 5 is characterized by: The rotating shaft (17) is a sealed rotating shaft.
7. The water treatment device for tunnel karst according to claim 1, characterized in that: Also includes: A pair of mounting plates (19) are fixedly connected to the machine body (1); a through hole is provided on the machine body (1) between the pair of mounting plates (19); and the water suction pipe (2) is inserted into the through hole; A pair of cylinders (20) are respectively fixed on a pair of mounting plates (19); the top ends of the pair of cylinders (20) are respectively fixedly connected to fixing plates (21); a clamping ring (22) is integrally formed between the pair of fixing plates (21); the clamping ring (22) is sleeved on the water suction pipe (2) and fixed to the water suction pipe (2).
8. The water treatment device for tunnel karst according to claim 1, characterized in that: Also includes: A pump (23) is arranged at the top end of the water suction pipe (2); the water outlet end of the pump (23) is connected to a connecting pipe (24); one end of the connecting pipe (24) away from the pump (23) is fixed to the machine body (1); and the connecting pipe (24) is used to connect to an external water treatment mechanism.
9. The effluent treatment device for tunnel karst according to claim 1, characterized in that: The bottom surface of the bottom plate (4) is fixedly connected with anti-slip grooves (25).
10. A method for treating effluent in tunnel karst, according to the effluent treatment device for tunnel karst according to any one of claims 1 to 8, characterized in that: The following steps are also included: Moving the machine body (1) to a karst water outlet position; The water suction pipe (2) is lowered until the karst water covers the water suction hole, and then the pump (23) is started to discharge the karst water; During the drainage process, the water suction pipe (2) is intermittently raised and lowered, so that the transmission rod (6) is reciprocatedly raised and lowered relative to the water suction pipe (2); The ball (9) and the transmission sleeve (10) are limitedly slidably connected, so that the transmission sleeve (10) drives a plurality of scrapers (3) to reciprocate and scrape the water absorption holes; When draining water, the driving motor (16) is started to rotate a plurality of paddles (5) to stir the karst water.
Citation Information
Patent Citations
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KR1020160025256A