JP2005307575A - Equipment and method for cleaning inside of well hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment for cleaning the inside of a well hole, which eliminates the risk of igniting an inflammable gas in the well hole, which can reduce costs, and which can reduce cleaning agent loadings. <P>SOLUTION: A brush 19 for scratching off stains adhering to the inner peripheral surface of the well hole 1 is provided on the outer peripheral surface of a column pipe 11 which can be inserted into the well hole 1; an air duct 23 for generating an ascending current in the column pipe 11 by blasting out is inserted into the pumping pipe 11; and a lower end of the column pipe 11 is constituted as a vertically extendable/contractible bellows member 15 which is urged in the direction of extension. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cleaning apparatus and a cleaning method for cleaning the inside of a well hole such as a soil pollution repair site where illegally dumped organic sludge, incinerated ash, etc., or a pumping well of a landfill disposal site.

  Conventionally, as a cleaning device of this type, for example, as shown in FIG. 9, the motor case 52 can be inserted into the well hole 51 from above and the motor 52 a is built in, and the outer peripheral surface of the motor case 52 can be expanded and contracted. There is one provided with a stopper 53 that is provided and that comes into contact with the inner wall of the well hole 51 to prevent shaking, and a cleaner main body 55 that is directly connected to the motor shaft 54 at the lower end of the motor case 52 (see Patent Document 1). .

  The washer body 55 is provided so as to surround the support bar 56 connected to the motor shaft 54, the screw 57 fixed to the lower end of the support bar 56, and the upper part of the screw 57. The tube 58 has a plurality of drain holes 59 around the lower portion of the tube 58 and two upper and lower brushes 60 on the outer periphery of the lower portion.

  According to this, the motor case 52, the stopper 53, and the cleaner main body 55 are inserted into the well hole 51, and the motor case 52 extends and presses the stopper 53 so as to contact the inner wall of the well hole 51. Then, the brush 60 is rotated by rotating the motor 52a to remove scales adhering to the inner peripheral surface of the well hole 51.

  However, in the above conventional type, the cleaner body 55 is integrated with the motor case 52 including the motor 52a, and the motor case 52 is inserted into the well hole 51 together with the cleaner body 55 during cleaning. If flammable gas (methane gas or the like) is generated in the well hole 51, if a spark occurs in an electric device such as the motor 52 a, the flammable gas in the well hole 51 may be ignited.

In addition, since the cleaning device includes the electric device such as the motor 52a, there is a problem that the cleaning device becomes expensive and the maintenance cost increases.
Furthermore, when the cleaning agent is added into the well hole 51 and the inner peripheral surface of the well hole 51 is cleaned with the brush 60, if the amount of water in the well hole 51 is large, the cleaning agent is diluted. Therefore, there was a problem that a large amount of cleaning agent had to be added.
JP-A-8-209754

  The present invention eliminates the risk of igniting the combustible gas in the well hole during cleaning, can reduce costs, and can further reduce the amount of cleaning agent added to the well hole It is an object of the present invention to provide a cleaning apparatus for a hole and a cleaning method for a well hole.

  In order to achieve the above object, the first invention is a cleaning device for cleaning the inside of a well hole in which groundwater flowing in from the surroundings is accumulated, and a suction port is provided at the lower end of a pumping pipe that can be inserted into the well hole. A cleaning member is provided on the outer peripheral surface of the water pumping pipe to scrape off dirt adhering to the inner peripheral surface of the well hole. Air is blown into the lower end of the water pumping pipe into the water pumping pipe and rises into the water pumping pipe. An air supply pipe for generating a flow is inserted, and the lower end portion of the pumped-up pipe is configured as an expansion / contraction member that can expand and contract in the vertical direction and is urged in the extension direction.

  According to this, the pumping pipe is inserted into the well hole, and air is blown out from the supply pipe into the lower end of the pumping pipe to generate an upward flow in the pumping pipe. Thereby, the sediment deposited at the bottom in the well hole is sucked into the pumping pipe from the suction port by the air lift together with the well water and discharged from the upper part of the pumping pipe. After removing the deposits in the well hole in this way, the blowing of air from the supply pipe is stopped, the lower end of the pumping pipe is pressed against the bottom surface in the well hole, and the suction port is placed in the well hole. Close at the bottom. Thereby, the inside of a well hole is divided into the exterior and interior of a pumping pipe.

  Then, a cleaning agent is added between the outer peripheral surface of the pumping pipe and the inner peripheral surface of the well hole, and the pumping pipe is swung in the vertical direction. Thereby, the cleaning member moves up and down to scrape off the dirt on the inner peripheral surface of the well hole. At this time, when the pumping pipe swings downward, the telescopic member of the pumping pipe is shortened, and when the pumping pipe swings upward, the telescopic member of the pumping pipe extends due to urging in the extension direction, so that the suction port is The bottom of the well hole is kept closed. Thus, the well water in the well hole is partitioned by the pumping pipe into well water between the outer peripheral surface of the pumping pipe and the inner peripheral surface of the well hole and well water in the pumping pipe. Therefore, the amount of the cleaning agent added may be determined according to the amount of water between the outer peripheral surface of the pumping pipe and the inner peripheral surface of the well hole, not the total amount of water in the well hole. The amount of agent added can be reduced.

  Further, since the inside of the well hole is divided into the outside and inside of the pumping pipe, the well water in the pumping pipe is prevented from flowing out from the suction port between the outer peripheral surface of the pumping pipe and the inner peripheral surface of the well hole. The cleaning agent added to the well water between the outer peripheral surface of the pumping pipe and the inner peripheral surface of the well hole is not diluted, and the cleaning power is maintained.

  In addition, a pumping pipe with a built-in air supply pipe is inserted into the well hole during cleaning, but it is not necessary to insert an electric device such as a motor, thus preventing the occurrence of electrical sparks in the well hole. Even if combustible gas is generated in the well hole, it can be prevented from igniting. Moreover, cost reduction can be aimed at.

In the second aspect of the present invention, a packing surrounding the suction port is provided at the lower end of the elastic member.
According to this, when the lower end of the pumping pipe is pressed against the bottom surface in the well hole, the packing closely contacts the bottom surface in the well hole, so that the gap between the lower end of the pumping pipe and the bottom surface in the well hole is reduced by the packing. To do. As a result, the suction port is securely closed at the bottom surface in the well hole, and well water in the pumping pipe is reliably prevented from flowing out from the suction port to the outer peripheral surface of the pumping pipe and the inner peripheral surface of the well hole. be able to.

In the third invention, a brush that brushes the inner peripheral surface of the well hole is used as the cleaning member, and a bellows member is used as the expansion and contraction member.
According to this, since the brush moves up and down and the inner peripheral surface of the well hole is brushed by swinging the pumping pipe in the vertical direction, dirt can be scraped off. At this time, if the pumping pipe swings downward, the bellows member is shortened, and if the pumping pipe swings upward, the bellows member extends, so that the suction port is kept blocked by the bottom surface in the well hole. Be drunk.

  The fourth invention is a well hole cleaning method using the well hole cleaning device according to any one of the first to third inventions, wherein a pumping pipe is inserted into the well hole. Air is blown out from the supply pipe into the lower end of the pumping pipe to generate an upward flow in the pumping pipe. After discharging the deposit and removing the deposits, stop the blowing of air from the air supply pipe, press the lower end of the pumping pipe against the bottom surface in the well hole, the outer peripheral surface of the pumping pipe and the inner circumference of the well hole A cleaning agent is added between the surface and the pumping pipe is swung in the vertical direction to clean the inner peripheral surface of the well hole with the cleaning member.

  According to the present invention, since it is not necessary to insert an electric device such as a motor into the well hole during cleaning, the occurrence of sparks in the well hole can be prevented, and the combustible gas in the well hole is ignited. Can be prevented. Moreover, the addition amount of a cleaning agent can be reduced, and costs, such as maintenance management, can be reduced.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 3, reference numeral 1 denotes a well hole of a pumping well formed at a soil pollution repair site, a landfill site, or the like. An inner peripheral surface and a bottom surface of the well hole 1 are formed by a screen 2 such as a wire mesh, and a layer 3 of crushed pebbles is formed outside the screen 2. In the well hole 1, groundwater that has flowed in from the surroundings through the pebble layer 3 and the screen 2 is accumulated. Reference numeral 4 denotes the surface of the well water 5 (= ground water) accumulated in the well hole 1.

Reference numeral 10 denotes a cleaning device for cleaning the inside of the well hole 1 and is configured as follows.
A suction port 12 is formed at the lower end of the pumping pipe 11 that can be inserted into the well hole 1. Further, the upper part of the pumping pipe 11 is on the ground and is bent in the horizontal direction by an elbow 13. A discharge port 14 is formed at the upper end of the water pump 11. A lower end portion of the pumping pipe 11 is configured as a bellows member 15 (an example of an elastic member) that can expand and contract in the vertical direction. The bellows member 15 is biased in the extending direction by a coiled spring 16 (an example of a biasing member) provided inside.

  The pumping pipe 11 is divided into a plurality of upper and lower divided pipe bodies 11a, 11b, and 11c, and the divided pipe bodies 11a, 11b, and 11c are connected to each other via a male screw 17 and a female screw 18. A brush 19 (an example of a cleaning member) for brushing the screen 2 on the inner peripheral surface of the well hole 1 is annularly attached to the outer peripheral surface of the pumping pipe 11 at a plurality of upper and lower portions. Further, an annular rubber packing 20 is provided at the lower end of the bellows member 15 so as to surround the suction port 12.

  An air lift supply pipe 23 having an air outlet 22 formed at the lower end is inserted into the pumping pipe 11. The air supply pipe 23 is supported by the pumping pipe 11 so as to be movable in the vertical direction by support members 24 provided at a plurality of locations on the inner peripheral surface of the pumping pipe 11. As shown in FIGS. 2 and 3, the support member 24 is a ring-shaped member, and the air supply pipe 23 is inserted into the support member 24, and the stopper 25 provided on the outer peripheral surface of the air supply pipe 23 is the uppermost position. By locking the support member 24 from above, the supply pipe 23 is prevented from falling off. A compressor 26 that supplies compressed air to the air supply pipe 23 is installed on the ground, and the compressor 26 and the upper end of the air supply pipe 23 are connected via a flexible hose 27. One end of the hose 27 is connected to the compressor 26, and the other end is connected to the upper end of the air supply pipe 23.

  Further, the water pumping pipe 11 is inserted into a through hole 30 formed at the center of the water shielding plate 29 that closes the upper end portion of the well hole 1, and is configured to be movable up and down with respect to the water shielding plate 29. . The water shielding plate 29 is detachably fitted into the upper end of the well hole 1, and the water shielding plate 29 has a cleaning agent between the inner peripheral surface of the well hole 1 and the outer peripheral surface of the pumping pipe 11 from the ground. The cleaning agent addition pipe 32 to which 31 (acid etc.) is added and the cleaning agent 31 added from the cleaning agent addition pipe 32 generate A between the inner peripheral surface of the well hole 1 and the outer peripheral surface of the pumping pipe 11. A bubble vent tube 33 for removing bubbles 34 such as carbon dioxide gas is connected. A flexible hose or the like is used for both the tubes 32 and 33.

For example, the inner diameter and depth of the well hole 1 are about 100 to 150 mm and about 10 to 20 m, and the outer diameter of the water pump 11 is about 30 to 40 mm.
Hereinafter, a method for cleaning the well hole 1 using the cleaning apparatus 10 will be described.

  As shown in FIG. 1, the operator inserts the pumping pipe 11 into the well hole 1, inserts the water shielding plate 29 into the upper end of the well hole 1, operates the compressor 26, and supplies the compressed air 35 to the air supply pipe 23. By supplying, air 35 is blown out from the air outlet 22 into the pumping pipe 11, and an upward flow 36 is generated in the pumping pipe 11. At this time, when the operator holds the pumping pipe 11 by hand and swings it up and down, the deposit 6 deposited on the bottom of the well hole 1 is rolled up and sucked from the suction port 12 together with the well water 5. The air lift lifts the inside of the pumping pipe 11 and is discharged from the discharge port 14. Moreover, since the brush 19 moves up and down and brushes the screen 2 of the well hole 1 by swinging the pumping pipe 11 in the vertical direction as described above, the dirt can be scraped off.

  After removing the deposit 6 in the well hole 1 in this way, the compressor 26 is stopped, and the lower end of the pumping pipe 11 is pressed against the bottom surface in the well hole 1 as shown in FIG. Is closed by the bottom surface in the well hole 1. Thereby, the inside of the well hole 1 is divided into the outside and the inside of the pumped-up pipe 11. At this time, since the packing 20 is in close contact with the bottom surface in the well hole 1, the gap between the lower end of the pumping pipe 11 and the bottom surface in the well hole 1 is reduced by the packing 20, and the suction port 12 is in the bottom surface in the well hole 1. Thus, the well water 5 in the pumping pipe 11 B is reliably prevented from flowing out from the suction port 12 to the space A between the outer peripheral surface of the pumping pipe 11 and the inner peripheral surface of the well hole 1. be able to.

  Then, the cleaning agent 31 is added from the cleaning agent addition pipe 32 to the space A between the inner peripheral surface of the well hole 1 and the outer peripheral surface of the pumping pipe 11, and the operator swings up and down with the pumping pipe 11 by hand. To do. Thereby, since the brush 19 moves up and down and brushes the screen 2 of the well hole 1, dirt can be scraped off.

  At this time, as shown by the solid line in FIG. 5, when the pumping pipe 11 swings downward, the bellows member 15 is shortened (compressed) against the urging force of the spring 16, and as shown in FIG. When 11 swings upward, the bellows member 15 is extended by the biasing force of the spring 16, so that the suction port 12 is kept closed by the bottom surface in the well hole 1. As a result, the well water 5 in the well hole 1 is divided into the well water 5 in the space A between the outer peripheral surface of the pump tube 11 and the inner peripheral surface of the well hole 1 and the well water 5 in the water pump pipe 11 by the pump tube 11. Partitioned. Therefore, if the addition amount of the cleaning agent 31 is determined not only based on the total amount of water in the well hole 1 but only according to the amount of water in the area A between the outer peripheral surface of the pumping pipe 11 and the inner peripheral surface of the well hole 1. Well, this makes it possible to reduce the amount of cleaning agent 31 added.

  Further, since the well water 5 in the pumping pipe 11 B is prevented from flowing out from the suction port 12 between the outer peripheral surface of the pumping pipe 11 and the inner peripheral surface of the well hole 1, the outer peripheral surface of the pumping pipe 11. The cleaning agent 31 added to the well water 5 of A between the inner periphery of the well hole 1 is not diluted, and the cleaning power is maintained.

  In addition, since the air supply pipe 23 is supported by the pumping pipe 11 while being movable in the vertical direction by the support member 24, the air supply pipe 23 does not change in the vertical direction even if the pumping pipe 11 is swung in the vertical direction. .

  Further, in the cleaning device 10, since it is not necessary to insert an electric device such as a motor into the well hole 1 at the time of cleaning, the occurrence of sparks in the well hole 1 can be prevented, and the combustible in the well hole 1 can be prevented. Even if sex gas is generated, it can be prevented from igniting. Moreover, cost reduction can be aimed at.

  In the case where calcium carbonate scale or the like is deposited on the screen 2 of the well hole 1, an acid is used for the cleaning agent 31. When the cleaning agent 31 is added and cleaned from the cleaning agent addition pipe 32 to the space A between the inner peripheral surface of the well hole 1 and the outer peripheral surface of the pumping pipe 11 as described above, carbon dioxide gas is generated and foamed. A large amount of bubbles 34 are generated in the space A between the well hole 1 and the pumping pipe 11, but the water shielding plate 29 prevents the bubbles 34 from being ejected to the ground. Further, the bubbles 34 filled in the space A between the well hole 1 and the pumping pipe 11 are discharged from the well hole 1 through a bubble vent pipe 33 to a tank (not shown) installed on the ground.

  After cleaning the inside of the well hole 1 as described above, the pumping pipe 11 may be pulled up from the well hole 1 to the ground to complete the cleaning, or the pumping pipe 11 may be pulled up to a predetermined height and the pumping pipe 11, the compressor 26 is appropriately operated to supply the compressed air 35 to the air supply pipe 23, and the well water 5 in the well hole 1 is removed by air lift. The cleaning waste liquid may be discharged from the discharge port 14 by sucking in a certain amount.

  In the said 1st Embodiment, although the pumping-up pipe 11 is divided into 3 in the division pipe body 11a, 11b, 11c, you may divide | segment into multiple other than 3 divisions. In addition, since the divided tube bodies 11a, 11b, and 11c are joined to each other with screws 17 and 18, the number of the divided tube bodies can be increased or decreased to easily cope with the well holes 1 having various depths. Can do. Similarly to the pumping pipe 11, the air supply pipe 23 may be divided into a plurality of upper and lower divided pipes, and the divided pipes may be joined with screws or the like.

  In the first embodiment, the bellows member 15 is urged in the extending direction by the spring 16. However, as a second embodiment, as shown in FIG. A weight 38 may be provided at the lower end of the bellows, and the bellows member 15 may be biased in the extending direction by the weight of the weight 38.

  In the first embodiment, the air supply pipe 23 is supported by the pumping pipe 11 in a state where it can be moved in the vertical direction by the support member 24. As shown in FIG. 7, as the third embodiment, The air supply pipe 23 may be fixed to the pumping pipe 11. In this case, if the expansion / contraction range of the bellows member 15 is h, the lower end of the air supply pipe 23 is located above the expansion / contraction range h from the lower end of the elongated bellows member 15.

  In each said embodiment, although the bellows member 15 was used as an example of an expansion-contraction member, it is not limited to the bellows member 15. For example, as in the fourth embodiment shown in FIG. 8, the pumped-up pipe 11 is inserted into the pipe body 40 composed of the divided pipe bodies 11 a, 11 b, 11 c joined to each other, and the lower end of the pipe body 40. It is comprised with the exit / retreat pipe 41. FIG. The exit / retreat tube 41 can be moved up and down in the vertical direction from the lower end of the tube body 40, and an upper collar portion 41 a formed at the upper end of the exit / retreat tube 41 is an engaging portion 40 a formed in the lower end of the tube body 40. , The withdrawal / retraction tube 41 is prevented from dropping downward from the tube main body 40. Further, the exit / retreat pipe 41 is urged in a direction (extension direction) protruding downward by a coiled spring 16 (an example of an urging member) that is externally fitted. The spring 16 is held between a lower end of the tube main body 40 and a lower collar portion 41 b formed at the lower end of the exit / retreat tube 41.

  According to this, when the lower end of the pumping pipe 11 is pressed against the bottom surface in the well hole 1 and the operator swings the pumping pipe 11 in the vertical direction, if the pumping pipe 11 swings downward, the virtual line in FIG. As shown, the retracting pipe 41 retracts into the pipe body 40 against the urging force of the spring 16, thereby shortening the lower end of the pumped water pipe 11. Further, when the pumping pipe 11 swings upward, as shown by the solid line, the retracting pipe 41 protrudes downward from the lower end of the pipe main body 40 by the urging force of the spring 16, so that the lower end of the pumping pipe 11 extends. To do. Thus, the suction port 12 is kept closed by the bottom surface in the well hole 1, and the well water 5 in the well hole 1 is separated by the pumping pipe 11 from the outer peripheral surface of the pumped pipe 11 and the inner periphery of the well hole 1. It is divided into a well water 5 in the space A and a well water 5 in the pumping pipe 11.

  In the fourth embodiment, the exit / retreat pipe 41 is urged by the spring 16; however, it may be urged by the weight 38 as in the second embodiment. Similarly to the third embodiment, assuming that the lifting / lowering range of the exit / retreat pipe 41 is h, the lower end of the supply pipe 23 may be positioned above the lifting / lowering range h by more than the lower end of the descending / retreating pipe 41. Good.

  In each of the above-described embodiments, the brush 19 is used as an example of the cleaning member. However, the brush 19 is not limited thereto, and for example, a sponge or the like may be used.

It is a figure of the cleaning apparatus for well holes in the 1st Embodiment of this invention, and shows a mode that the deposit in a well hole is sucked up and removed. It is sectional drawing of the lower part of the washing apparatus for well holes similarly. It is a XX arrow line view in FIG. It is a figure of the washing | cleaning apparatus for well holes similarly, and shows a mode that the lower end is contact | abutting to the bottom face in a well hole in the state which the bellows member expanded. It is a figure of the washing | cleaning apparatus for well holes similarly, and shows a mode that the lower end is contacting the bottom face in a well hole in the state which the bellows member shortened. It is sectional drawing of the lower part of the cleaning apparatus for well holes in the 2nd Embodiment of this invention. It is sectional drawing of the lower part of the washing apparatus for well holes in the 3rd Embodiment of this invention. It is sectional drawing of the lower part of the cleaning apparatus for well holes in the 4th Embodiment of this invention. It is a figure of the conventional washing apparatus for well holes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Well hole 5 Well water 6 Deposit 10 Well hole cleaning apparatus 11 Pumping pipe 12 Suction port 15 Bellows member (expandable member)
19 Brush (cleaning member)
20 Packing 23 Air supply pipe 31 Cleaning agent 35 Air 36 Upflow

Claims (4)

A cleaning device for cleaning the inside of a well hole in which groundwater flowing from the surroundings is accumulated, wherein a suction port is formed at a lower end of the pumping pipe that can be inserted into the well hole, and a well hole is formed on an outer peripheral surface of the pumping pipe. A cleaning member for scraping off dirt adhering to the inner peripheral surface of the pumping pipe is provided, and an air supply pipe for blowing air into the lower end of the pumping pipe to generate an upward flow is inserted into the pumping pipe. A well hole cleaning device, wherein the lower end portion is configured as an expansion / contraction member that is vertically expandable / contractable and biased in an extending direction. 2. A well hole cleaning device according to claim 1, wherein a packing surrounding the suction port is provided at the lower end of the elastic member. The well cleaning device for a well hole according to claim 1 or 2, wherein a brush for brushing the inner peripheral surface of the well hole is used as the cleaning member, and a bellows member is used as the expansion and contraction member. . A well hole cleaning method using the well hole cleaning device according to any one of claims 1 to 3, wherein a pumping pipe is inserted into the well hole, and the supply pipe is connected to the pumping pipe. Air is blown into the lower end of the pump to generate an upward flow in the pumping pipe, and the sediment deposited at the bottom of the well hole is sucked into the pumping pipe from the suction port with the well water by an air lift and discharged from the upper part of the pumping pipe. After removing the object, stop blowing air from the air supply pipe, press the lower end of the pumping pipe against the bottom of the well hole, and clean between the outer peripheral surface of the pumping pipe and the inner peripheral surface of the well hole A cleaning method for a well hole, characterized in that an agent is added, the pumping pipe is swung up and down, and the cleaning member removes dirt on the inner peripheral surface of the well hole.

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