A municipal sewage pipeline

Abstract

The present invention relates to the technical field of sewage discharge, and specifically relates to a municipal sewage pipe. A liquid discharge pipe is communicated with the side of the main drain pipe, and a material discharge pipe is communicated with the side of the main drain pipe. The material discharge pipe is located at the bottom of the liquid discharge pipe. A filter disc is installed at each part of the connection between the liquid discharge pipe and the main drain pipe. The bottom of the main drain pipe is fixedly connected with a chassis, and the bottom of the chassis is fixedly connected with a pipe base. The pipe base is fixedly connected to the side of the waste box. The top of the chassis is fixedly connected with a telescopic pipe, and a return spring is installed inside the telescopic pipe. The top of the telescopic pipe is fixedly connected with a weighing inclined plate, and the weighing inclined plate is inclined towards the liquid discharge pipe. Through the main drain pipe and its internal mechanism, the particulate matter in the sewage can be filtered and discharged into the interior of the waste box. By setting the waste box and its internal structure, it is convenient to store the particulate matter and convenient for personnel to handle, without the need for frequent handling.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage discharge, and specifically to a municipal sewage pipeline. Background Art

[0002] When discharging sewage, particulate matters (similar to sand and gravel) mixed in the sewage will cause great pressure on the sewage pipeline, resulting in slow sewage discharge. Since the sewage to be introduced needs to be filtered during the sewage discharge process, a large amount of filter residues often accumulate at the filter inlet. These filter residues will block the entire pipeline, and the filter residues at the filter need to be frequently cleaned to prevent blockage.

[0003] In the prior art, after sewage is discharged, a large amount of economic cost is consumed to treat particulate matters, the filtration pressure of the sewage is high, and the subsequent treatment is very inconvenient. Moreover, if not treated in time, it is easy for the sewage to overflow. Therefore, the present invention provides a municipal sewage pipeline. Summary of the Invention

[0004] The purpose of the present invention is to provide a municipal sewage pipeline to solve the problems raised in the above background art.

[0005] The technical solution of the present invention is as follows: A municipal sewage pipe includes a main drain pipe and a waste box. A liquid discharge pipe is connected to the side of the main drain pipe, and a material discharge pipe is connected to the side of the main drain pipe. The material discharge pipe is located at the bottom of the liquid discharge pipe. A filter disc is installed at each part of the connection between the liquid discharge pipe and the main drain pipe. The bottom of the main drain pipe is fixedly connected to a chassis, and the bottom of the chassis is fixedly connected to a pipe base. The pipe base is fixedly connected to the side of the waste box. The top of the chassis is fixedly connected to a telescopic pipe, and a return spring is installed inside the telescopic pipe. The top of the telescopic pipe is fixedly connected to a weighing inclined plate, and the weighing inclined plate is inclined towards the liquid discharge pipe. Control boxes are fixedly connected to both sides of the main drain pipe. A rotating shaft is connected to the inside of the main drain pipe through a one-way bearing. The rotating shaft penetrates the side wall of the control box, and limiting plates are fixedly connected to the side wall of the end of the rotating shaft at equal intervals. A rotating plate is fixedly connected to the middle side of the rotating shaft. A fixed cover is fixedly connected to the side of the control box. Two fixed shafts are fixedly connected to the inner wall of the control box. A torsion cylinder is rotatably connected to the side of the fixed shaft. A torsion spring is installed between the torsion cylinder and the fixed shaft. A limiting strip is fixedly connected to the side of the torsion cylinder. One limiting strip is located at the bottom of a limiting plate in the horizontal direction, and the other limiting strip is located at the top of the other limiting plate in the horizontal direction. A guiding inclined plate is fixedly connected to the inside of the main drain pipe, and the guiding inclined plate is inclined towards the side of the liquid discharge pipe. When in use: The device is buried underground. Initially, the limiting plates at both ends of the rotating shaft are both in a certain state. The two limiting plates in the horizontal direction are pressed and supported by the two limiting strips. The limiting strip close to the liquid discharge pipe is located at the bottom of the limiting plate, and the limiting strip far from the liquid discharge pipe is located at the top of the limiting plate. At the same time, the rotating shaft is connected through a one-way bearing and will not reverse. Sewage falls from the top of the main drain pipe and flows down obliquely to the top of the rotating plate on the side close to the liquid discharge pipe through the guiding inclined plate. Through the pressure, the limiting plate rotates towards the side of the liquid discharge pipe, pressing down the limiting strip. When the gravity reaches a certain level, the limiting strip is squeezed to rotate, causing the limiting plate to disengage from the limiting strip, making the rotating plate rotate, and making the sewage flow down intermittently in a stream. After the limiting plate and the limiting strip are disengaged, the limiting strip immediately returns to its original position through the torsion spring, blocking the other limiting plate. The sewage falls onto the top of the weighing inclined plate. The liquid flows into the inside of the liquid discharge pipe through the filter disc, and the particulate matter remains on the top of the weighing inclined plate. The return spring inside the telescopic pipe deforms due to the gravity on the top of the weighing inclined plate, and the telescopic pipe contracts. When the weighing inclined plate is almost lower than the top of the material discharge pipe, because the sewage flows down in a stream, the telescopic pipe will drop a certain distance and will not drop slowly. Also, because the weighing inclined plate is inclined towards the side of the liquid discharge pipe, when the weighing inclined plate is lower than the material discharge pipe, the particulate matter slides towards the inside of the material discharge pipe, and then the weighing inclined plate returns to its original position through the return spring.

[0006] Preferably, the bottom end of the discharge pipe communicates with the waste box. One end of the liquid discharge pipe away from the main drain pipe communicates with a U-shaped pipe. The bottom end of the U-shaped pipe is fixedly connected with a sedimentation pipe. A sedimentation hole is formed in the top of the waste box, and the sedimentation pipe is fixedly connected with the sedimentation hole. A large round hole is formed in the inner wall of the top of the waste box. A disc groove is formed inside the waste box. The disc groove is located between the large round hole and the sedimentation hole and communicates with the large round hole and the sedimentation hole respectively. A rotating column is rotatably connected to the top of the waste box. The rotating column is located at the center of the disc groove. A sealing disc is fixedly connected to the side of the bottom end of the rotating column. The sealing disc is located inside the disc groove. Two fixed columns are fixedly connected to the inner wall of the top of the waste box. A material scattering plate is fixedly connected to the bottom of the fixed column. The fixed columns are located at both ends of the feed hole. A liquid overflow pipe is communicated with the side of the waste box. An access hole is formed in the top of the waste box, and an inlet and outlet is fixedly connected inside the access hole. When in use: the particulate matter inside the discharge pipe is discharged downward through the feed hole and falls onto the top of the material scattering plate and scatters downward, avoiding accumulation at one place and blocking the feed hole. The liquid flows into the U-shaped pipe through the liquid discharge pipe. If there are excess impurities inside the U-shaped pipe, they precipitate through the bottom of the U-shaped pipe. The rotating column is on the ground. By rotating the rotating column, the sealing disc rotates, so that the U-shaped pipe and the waste box are conducted through the sedimentation pipe, and the precipitate falls into the inside of the waste box. Rotate the rotating column to close the U-shaped pipe and the waste box. By providing the inlet and outlet, it is convenient for personnel to handle the substances inside the waste box. If there is too much liquid inside the waste box, it can be discharged through the liquid overflow pipe.

[0007] The present invention hereby provides an improved municipal sewage pipe. Compared with the prior art, it has the following improvements and advantages:

[0008] First: A municipal sewage pipeline according to the present invention is buried underground. Initially, the two limit plates at both ends of the rotating shaft are both six. The two limit plates in the horizontal direction are pressed and supported by two limit strips. The limit strip close to the drain pipe is located at the bottom of the limit plate, and the limit strip far from the drain pipe is located at the top of the limit plate. At the same time, the rotating shaft is connected by a one-way bearing and will not reverse. Sewage falls from the top of the main drain pipe and flows obliquely downward to one side through the guide chute and falls onto the top of the rotating plate on the side close to the drain pipe. Due to the pressure, the limit plate rotates towards the drain pipe side, pressing down the limit strip. When the gravity reaches a certain level, the limit strip is squeezed and rotated, causing the limit plate to disengage from the limit strip, rotating the rotating plate, and making the sewage flow intermittently in a stream. After the limit plate disengages from the limit strip, the limit strip immediately returns to its original position through the torsion spring, blocking another limit plate. The sewage falls onto the top of the weighing chute. The liquid flows into the inside of the drain pipe through the filter disk, and the particulate matter remains on the top of the weighing chute. The return spring inside the telescopic pipe deforms due to the gravity on the top of the weighing chute, and the telescopic pipe contracts. When the weighing chute is almost lower than the top of the discharge pipe, because the sewage flows in a stream, the telescopic pipe will drop a certain distance and will not drop slowly. Also, because the weighing chute is inclined towards the drain pipe side, when the weighing chute is lower than the discharge pipe, the particulate matter slides towards the inside of the discharge pipe, and then the weighing chute returns to its original position through the return spring;

[0009] Second: For a municipal sewage pipeline according to the present invention, the particulate matter inside the discharge pipe is discharged downward through the feed hole and falls onto the top of the spreading plate, dispersing and falling to avoid accumulation at one place and blocking the feed hole. The liquid flows into the U-shaped pipe through the drain pipe. If there are excess impurities inside the U-shaped pipe, they precipitate at the bottom of the U-shaped pipe. The rotating column is on the ground. By rotating the rotating column, the closing disk rotates, connecting the U-shaped pipe and the waste box through the sedimentation pipe, causing the sediment to fall into the inside of the waste box. By rotating the rotating column, the U-shaped pipe and the waste box are closed. By setting the inlet and outlet, it is convenient for personnel to handle the substances inside the waste box. If there is too much liquid inside the waste box, it can be discharged through the overflow pipe;

[0010] Summary: A municipal sewage pipeline according to the present invention can filter the particulate matter in the sewage through the main drain pipe and its internal mechanism and discharge it into the inside of the waste box. By setting the waste box and its internal structure, it is convenient to store the particulate matter and convenient for personnel to handle, without the need for frequent handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following further explains the present invention in conjunction with the drawings and embodiments:

[0012] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0013] Figure 2 is a structural schematic diagram of the main drain pipe of the present invention;

[0014] Figure 3It is a schematic diagram of the weighing inclined disk structure of the present invention;

[0015] Figure 4 It is a schematic diagram of the material guiding inclined plate structure of the present invention;

[0016] Figure 5 It is a schematic diagram of the control box structure of the present invention;

[0017] Figure 6 It is a schematic diagram of the waste box structure of the present invention;

[0018] Figure 7 It is a schematic cross-sectional view of the waste box structure of the present invention.

[0019] Explanation of reference numerals:

[0020] 1. Main drain pipe; 2. Waste box; 3. Rotating plate; 4. Pipe base; 5. Drain pipe; 6. Discharge pipe; 7. Fixed cover; 8. Chassis; 9. Telescopic pipe; 10. Weighing inclined disk; 11. Filter disk; 12. Control box; 13. Material guiding inclined plate; 14. Rotating shaft; 15. Limiting plate; 16. Fixed shaft; 17. Torsion spring; 18. Torsion cylinder; 19. Limiting strip; 20. U-shaped pipe; 21. Precipitation pipe; 22. Sealing disk; 23. Rotating column; 24. Overflow pipe; 25. Inlet and outlet; 26. Fixed column; 27. Scattering plate; 28. Large round hole; 29. Precipitation hole; 30. Disk groove; 31. Inlet and outlet hole; 32. Feed hole. Detailed implementation manners

[0021] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] The present invention provides a municipal sewage pipe through improvement. The technical solution of the present invention is:

[0023] As Figures 1-7As shown in the figure, a municipal sewage pipe includes a main drain pipe 1 and a waste box 2. A liquid discharge pipe 5 is connected to the side of the main drain pipe 1, and a material discharge pipe 6 is connected to the side of the main drain pipe 1. The material discharge pipe 6 is located at the bottom of the liquid discharge pipe 5. A filter disc 11 is installed at each part of the connection between the liquid discharge pipe 5 and the main drain pipe 1. The bottom of the main drain pipe 1 is fixedly connected to a chassis 8, and the bottom of the chassis 8 is fixedly connected to a pipe base 4. The pipe base 4 is fixedly connected to the side of the waste box 2. The top of the chassis 8 is fixedly connected to a telescopic pipe 9. A return spring is installed inside the telescopic pipe 9. The top of the telescopic pipe 9 is fixedly connected to a weighing inclined plate 10. The weighing inclined plate 10 inclines towards the liquid discharge pipe 5. Control boxes 12 are fixedly connected to both sides of the main drain pipe 1. A rotating shaft 14 is connected to the inside of the main drain pipe 1 through a one-way bearing. The rotating shaft 14 penetrates through the side wall of the control box 12, and limiting plates 15 are fixedly connected to the side wall of the end of the rotating shaft 14 at equal intervals. A rotating plate 3 is fixedly connected to the middle side of the rotating shaft 14. A fixed cover 7 is fixedly connected to the side of the control box 12. Two fixed shafts 16 are fixedly connected to the inner wall of the control box 12. A torsion cylinder 18 is rotatably connected to the side of the fixed shaft 16. A torsion spring 17 is installed between the torsion cylinder 18 and the fixed shaft 16. A limiting strip 19 is fixedly connected to the side of the torsion cylinder 18. One limiting strip 19 is located at the bottom of a limiting plate 15 in the horizontal direction, and the other limiting strip 19 is located at the top of the other limiting plate 15 in the horizontal direction. A guide material inclined plate 13 is fixedly connected to the inside of the main drain pipe 1. The guide material inclined plate 13 inclines towards the side of the liquid discharge pipe 5. When in use: The device is buried underground. Initially, the limiting plates 15 at both ends of the rotating shaft 14 are both in a certain state. The two limiting plates 15 in the horizontal direction are pressed and supported by the two limiting strips 19. The limiting strip 19 close to the liquid discharge pipe 5 is located at the bottom of the limiting plate 15, and the limiting strip 19 far from the liquid discharge pipe 5 is located at the top of the limiting plate 15. At the same time, the rotating shaft 14 is connected through a one-way bearing and will not rotate in reverse. Sewage falls into the main drain pipe 1 from the top, flows down obliquely through the guide material inclined plate 13 to the top of the rotating plate 3 on the side close to the liquid discharge pipe 5. Due to the pressure, the limiting plate 15 rotates towards the side of the liquid discharge pipe 5, pressing down the limiting strip 19. When the gravity reaches a certain level, it squeezes the limiting strip 19 to rotate, causing the limiting plate 15 to disengage from the limiting strip 19, making the rotating plate 3 rotate, and making the sewage flow intermittently in a stream. After the limiting plate 15 disengages from the limiting strip 19, the limiting strip 19 immediately resets through the torsion spring 17 to block the other limiting plate 15. The sewage falls onto the top of the weighing inclined plate 10. The liquid flows into the inside of the liquid discharge pipe 5 through the filter disc 11, and the particulate matter remains on the top of the weighing inclined plate 10. The return spring inside the telescopic pipe 9 deforms due to the gravity on the top of the weighing inclined plate 10, and the telescopic pipe 9 contracts. When the weighing inclined plate 10 is almost lower than the top of the material discharge pipe 6, because the sewage flows in a stream, the telescopic pipe 9 will drop a certain distance and will not drop slowly. Also, because the weighing inclined plate 10 inclines towards the side of the liquid discharge pipe 5, when the weighing inclined plate 10 is lower than the material discharge pipe 6, the particulate matter slides towards the inside of the material discharge pipe 6, and then the weighing inclined plate 10 resets through the return spring.

[0024] Further, the bottom end of the discharge pipe 6 is communicated with the waste box 2. One end of the liquid discharge pipe 5 far from the main drain pipe 1 is communicated with a U-shaped pipe 20. The bottom end of the U-shaped pipe 20 is fixedly connected with a precipitation pipe 21. A precipitation hole 29 is formed in the top of the waste box 2. The precipitation pipe 21 is fixedly connected with the precipitation hole 29. A large round hole 28 is formed in the inner wall of the top of the waste box 2. A disc groove 30 is formed inside the waste box 2. The disc groove 30 is located between the large round hole 28 and the precipitation hole 29 and the disc groove 30 is respectively communicated with the large round hole 28 and the precipitation hole 29. A rotating column 23 is rotatably connected to the top of the waste box 2. The rotating column 23 is located at the center of the disc groove 30. The bottom side of the rotating column 23 is fixedly connected with a sealing disc 22. The sealing disc 22 is located inside the disc groove 30. Two fixed columns 26 are fixedly connected to the inner wall of the top of the waste box 2. The bottom of the fixed column 26 is fixedly connected with a material scattering plate 27. The fixed columns 26 are located at both ends of the feed hole 32. A liquid overflow pipe 24 is communicated with the side of the waste box 2. An access hole 31 is formed in the top of the waste box 2. An inlet and outlet 25 is fixedly connected inside the access hole 31. During use: the particulate matter inside the discharge pipe 6 is discharged downward through the feed hole 32 and falls onto the top of the material scattering plate 27 and scatters downward to avoid accumulation at one place and block the feed hole 32. The liquid flows into the U-shaped pipe 20 through the liquid discharge pipe 5. If there are excess impurities inside the U-shaped pipe 20, they precipitate at the bottom of the U-shaped pipe 20. The rotating column 23 is on the ground. By rotating the rotating column 23, the sealing disc 22 rotates, so that the U-shaped pipe 20 and the waste box 2 are conducted through the precipitation pipe 21, and the precipitate falls into the inside of the waste box 2. Rotate the rotating column 23 to close the U-shaped pipe 20 and the waste box 2. By providing the inlet and outlet 25, it is convenient for personnel to handle the substances inside the waste box 2. If there is too much liquid inside the waste box 2, it can be discharged through the liquid overflow pipe 24.

[0025] Working principle: When in use: The device is buried underground. Initially, both limit plates 15 at the two ends of the rotating shaft 14 are in a certain state. The two horizontal limit plates 15 are pressed and supported by two limit bars 19. The limit bar 19 close to the drain pipe 5 is located at the bottom of the limit plate 15, and the limit bar 19 far from the drain pipe 5 is located at the top of the limit plate 15. At the same time, the rotating shaft 14 is connected by a one-way bearing and will not reverse. Sewage falls from the top of the main drain pipe 1 and flows obliquely downward to one side through the guide chute 13 and falls onto the top of the rotating plate 3 on the side close to the drain pipe 5. Due to the pressure, the limit plate 15 rotates towards the drain pipe 5 side, pressing down the limit bar 19. When the gravity reaches a certain level, the limit bar 19 is squeezed and rotated, causing the limit plate 15 to disengage from the limit bar 19, making the rotating plate 3 rotate, and the sewage flows intermittently in a stream. After the limit plate 15 disengages from the limit bar 19, the limit bar 19 immediately resets through the torsion spring 17 to block the other limit plate 15. The sewage falls onto the top of the weighing tray 10, and the liquid flows into the interior of the drain pipe 5 through the filter tray 11, while the particulate matter remains on the top of the weighing tray 10. The return spring inside the telescopic tube 9 deforms due to the gravity on the top of the weighing tray 10, and the telescopic tube 9 contracts. When the weighing tray 10 is almost lower than the top of the discharge pipe 6, because the sewage flows in a stream, the telescopic tube 9 will drop a certain distance and will not drop slowly. Also, because the weighing tray 10 is inclined towards the drain pipe 5 side, when the weighing tray 10 is lower than the discharge pipe 6, the particulate matter slides towards the inner side of the discharge pipe 6. Then the weighing tray 10 resets through the return spring, and the particulate matter inside the discharge pipe 6 is discharged downward through the feed hole 32 and falls onto the top of the spreading plate 27 and scatters down to avoid accumulation at one place and blocking the feed hole 32. The liquid flows into the U-shaped tube 20 through the drain pipe 5. If there are excess impurities inside the U-shaped tube 20, they precipitate at the bottom of the U-shaped tube 20. The rotating column 23 is on the ground. By rotating the rotating column 23, the closing disk 22 rotates, making the U-shaped tube 20 communicate with the waste box 2 through the sedimentation pipe 21, and the sediment falls into the interior of the waste box 2. By rotating the rotating column 23, the U-shaped tube 20 and the waste box 2 are closed. By setting the inlet and outlet 25, it is convenient for personnel to handle the substances inside the waste box 2. If there is too much liquid inside the waste box 2, it can be discharged through the overflow pipe 24.

[0026] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A municipal sewage pipeline, comprising a main drainage pipe (1) and a waste box (2), characterized in that: A liquid discharge pipe (5) is connected to the side of the main drain pipe (1), and a material discharge pipe (6) is connected to the side of the main drain pipe (1). The material discharge pipe (6) is located at the bottom of the liquid discharge pipe (5). A filter disc (11) is installed inside the connection between the liquid discharge pipe (5) and the main drain pipe (1). A chassis (8) is fixedly connected to the bottom of the main drain pipe (1), and a pipe base (4) is fixedly connected to the bottom of the chassis (8). The pipe base (4) is fixedly connected to the side of the waste box (2). A telescopic pipe (9) is fixedly connected to the top of the chassis (8). A return spring is installed inside the telescopic pipe (9). A weighing inclined disc (10) is fixedly connected to the top of the telescopic pipe (9), and the weighing inclined disc (10) inclines towards the liquid discharge pipe (5). Control boxes (12) are fixedly connected to both sides of the main drain pipe (1). A rotating shaft (14) is connected to the inside of the main drain pipe (1) through a one-way bearing. The rotating shaft (14) penetrates through the side wall of the control box (12), and limiting plates (15) are fixedly connected to the side wall of the end of the rotating shaft (14) at equal intervals. A rotating plate (3) is fixedly connected to the middle side of the rotating shaft (14), and a fixed cover (7) is fixedly connected to the side of the control box (12). Two fixed shafts (16) are fixedly connected to the inner wall of the control box (12). A torsion cylinder (18) is rotatably connected to the side of the fixed shaft (16). A torsion spring (17) is installed between the torsion cylinder (18) and the fixed shaft (16). A limiting strip (19) is fixedly connected to the side of the torsion cylinder (18). One limiting strip (19) is located at the bottom of a limiting plate (15) in the horizontal direction, and the other limiting strip (19) is located at the top of the other limiting plate (15) in the horizontal direction. A material guiding inclined plate (13) is fixedly connected to the inside of the main drain pipe (1), and the material guiding inclined plate (13) inclines towards the side of the liquid discharge pipe (5).

2. The municipal sewage pipeline according to claim 1, characterized in that: The bottom end of the material discharge pipe (6) is communicated with the waste box (2). One end of the liquid discharge pipe (5) far from the main drain pipe (1) is communicated with a U-shaped pipe (20). A sedimentation pipe (21) is fixedly connected to the bottom end of the U-shaped pipe (20). A sedimentation hole (29) is opened at the top of the waste box (2), and the sedimentation pipe (21) is fixedly connected to the sedimentation hole (29).

3. The municipal sewage pipeline according to claim 2, characterized in that: A large round hole (28) is opened on the inner wall of the top of the waste box (2). A disc groove (30) is opened inside the waste box (2). The disc groove (30) is located between the large round hole (28) and the sedimentation hole (29) and is respectively communicated with the large round hole (28) and the sedimentation hole (29). A rotating column (23) is rotatably connected to the top of the waste box (2). The rotating column (23) is located at the center of the disc groove (30). A closing disc (22) is fixedly connected to the side of the bottom end of the rotating column (23), and the closing disc (22) is located inside the disc groove (30).

4. The municipal sewage pipeline according to claim 3, characterized in that: Two fixing columns (26) are fixedly connected to the inner wall of the top of the waste bin (2). A material spreading plate (27) is fixedly connected to the bottom of the fixing column (26). The fixing columns (26) are located at both ends of the feeding hole (32). A liquid overflow pipe (24) is communicated with the side part of the waste bin (2).

5. The municipal sewage pipeline according to claim 4, characterized in that: An access hole (31) is formed in the top of the waste bin (2), and an inlet and outlet (25) is fixedly connected inside the access hole (31).

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