JP2015214842A - Method and device for sucking deposit on bottom of well - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for sucking a deposit accumulated on the bottom of a well pipe.SOLUTION: An opening is provided at a tip of a lift pipe 2 for being inserted into a well pipe 1, and the lift pipe 2 is connected to a tank 9 of a suction vehicle 4 that is arranged on the ground. Sediment 10 is sucked in together with well water 6 from the opening at the tip of the lift pipe and stored in the tank 9. The well water 6 and the sediment 10 are separated from each other within the tank, and the tank 9 is subjected to connection of a return hose 5 for discharging the well water 6 accumulated as high as or higher than a fixed water level and returning it into the well pipe.

Description

  The present invention relates to a method for sucking up sediment deposited on the bottom of a well, and a sucking device used at that time.

  If a long time has passed since the well was installed, deteriorated mud rust adheres to the inner wall surface of the well pipe, and mud and earth and sand accumulate on the bottom. In order to remove mud rust stuck to the inner wall surface of the well pipe, the mud rust stuck to the inner wall surface can be washed away by rotating while jetting high-pressure water from the nozzle.

  Japanese Patent Application Laid-Open No. 2009-18214 “Deep well pipe cleaning method and cleaning apparatus” supports a rotating body between an upper guide and a lower guide, and a plurality of injection nozzles are attached to the outer periphery of the rotating body. The nozzle communicates with the ultra-high pressure water hose so that ultra-high pressure water is jetted, and the jet nozzle jets ultra-high pressure water and rotates with the rotating body along with the jet, and further jets below the lower guide. A net is installed to hold mud and other dirt washed away by water.

Further, if the inner wall surface of the well pipe is rubbed with a rotating brush, the adhered mud rust can be removed.
For example, “in-pipe cleaning device” according to Japanese Patent Laid-Open No. 8-209754 is inserted into a well pipe from above, and is provided with a motor case with a built-in motor and an outer peripheral surface of the motor case so as to be expandable / contractible. It has a stopper that comes in contact with the steady rest and a cleaner body that is directly connected to the motor shaft at the lower end of the motor case. The cleaner body is fixed to the support shaft connected to the motor shaft and the lower end of the support rod. And a tube provided so as to surround the support rod at the upper part of the screw, and a plurality of drain holes are provided around the lower part of the tube, and the inner wall of the well pipe is provided at the outer periphery of the lower part. And two upper and lower brushes having outer diameters as close as possible.

  Japanese Patent Application Laid-Open No. 2004-353296 discloses a well repair method and a well repair device in which a bottomed cylindrical recovery case is suspended in a well, and water is provided downward and obliquely upward from a water injection nozzle that is provided below the recovery case. Inject and scatter the buried earth and sand with the lower jet flow, guide the earth and sand from the outside to the upper side of the collection case with the upper jet flow, and take the earth and sand into the inside from the mouth on the upper side of the collection case. And a well repair method in which earth and sand are accumulated inside while draining water to the outside by a water permeable filter provided on at least a part of the bottom surface.

  In general, the “air lift method” is used to remove the mud accumulated on the bottom of the well pipe. As shown to Fig.4 (a), an air pipe is connected to the middle of the lift pipe which sucks up mud sand, and this lift pipe falls to the bottom of a well. And as shown in FIG.4 (b), compressed air is sent to a lift pipe through an air pipe from the ground with an air compressor. If air enters the lift pipe, the specific gravity of the water inside the lift pipe becomes small, and it is pushed by the groundwater inside the well pipe and is ejected to the ground together with the air.

  At this time, the groundwater in the well pipe can rapidly flow into the lift pipe from the tip of the lift pipe, and the earth and sand and gravel near the tip of the lift pipe can be involved and ejected to the ground at a rapid speed. When the earth and sand eruption decreases, the lift pipe is gradually lowered, and the earth and sand can be collected to a predetermined depth.

The dredging work using the air lift method can suck up the earth and water accumulated in the well pipe, so that the earth and sand accumulated at the bottom can be sucked up at the same time. .
Normally, in the air lift method, the water level has a predetermined depth inside the well pipe, but the water level drops when air is fed and the well water is sucked up.

  The water level of the wells varies, and there are wells in which groundwater self-ejects, some wells have a water level 3 meters from the ground, and others have a water level 30 to 40 meters deep from the ground. Therefore, if the water level is 30m to 40m, 50m, 60m deep and dredging by air lift method for such wells, if the water level further drops, supply air to the lift pipe In many cases, the air lift method cannot be used.

"Cleaning method and cleaning apparatus in deep well pipe" according to JP 2009-18214 A “In-pipe cleaning device” according to Japanese Patent Laid-Open No. 8-209754 "Well repair method and well repair device" according to JP-A-2004-353296

  Thus, the conventional air lift method has the above-mentioned problems. The problem to be solved by the present invention is this problem, in a well having a low water level, and it is possible to suck up all the sediment without lowering the groundwater accumulated in the well pipe. Methods and wicking devices are provided.

  The suction method for deposits deposited on the well bottom according to the present invention is a technique obtained by improving the conventional air lift method. Therefore, all the requirements for configuring the air lift method are provided, and the features of the present invention are added to the requirements. Therefore, the tip of the lift pipe is opened, and an air pipe is connected in the middle, and the compressed air supplied from the ground air compressor to the air pipe flows to the lift pipe.

  Then, mud and earth and sand, which are sediments, are sucked together with well water from the opening at the tip of the lift pipe, and the lift pipe is lifted to enter the tank of the suction wheel. And in this tank, water and earth and sand are separated, and water is returned to the well again. The lift pipe is connected to the tank of the suction wheel, and a hose for discharging water from the tank is connected, and this hose is inserted into the well. Here, the specific structure of the tank provided in the suction wheel is not limited.

The method of sucking up sediment deposited on the bottom of the well according to the present invention can suck up sediment deposited on the bottom of the well pipe from the opening of the tip of the lift pipe together with well water, as in the conventional air lift method.
The well water, mud and earth and sand sucked from the opening of the lift pipe rise up the lift pipe and enter the tank of the suction wheel, where the water and earth and sand are separated, and the water is returned to the well again.

  Therefore, in the case of a water level well with a depth of 30 to 40 m, 50 m, and 60 m from the ground, the water level is further lowered by sucking water from the lift pipe. Is returned to the well again. Therefore, the water level is not further lowered, and it can be sucked up and collected in the tank without leaving mud or earth deposited on the well bottom by the air lift method.

Schematic which shows the Example of the earth and sand suction apparatus which concerns on this invention. The Example which shows a suction wheel. The internal structure of the tank mounted on the suction vehicle. In the air lift method, (a) is a method in which the lift pipe is lowered to the bottom of the well pipe, and (b) is a method of sucking up the earth and sand using the lift pipe.

FIG. 1 is an embodiment showing a schematic view of the earth and sand suction device according to the present invention. In the figure, 1 is a well pipe, 2 is a lift pipe, 3 is an air pipe, 4 is a suction wheel, and 5 is a return hose.
The basic structure of the present invention is an air lift method, and a certain level of water is required to suck up mud and sediment deposited on the well bottom together with water by supplying air to the lift pipe 2.

  If the water level is lowered by sucking water, the hydrostatic pressure acting on the opening at the tip of the lift pipe is lowered, and even if the specific gravity in the pipe is reduced by supplying air to the lift pipe 2, it can rise to the ground. Disappear. A well water 6 is present inside the well pipe 1 and a water level 7 having a predetermined depth is maintained. The lift pipe 2 connected to the suction wheel 4 is inserted into the well pipe 1 and the tip is lowered to the bottom.

  In addition to the suction wheel 4, an air compressor 8 is disposed on the ground, and the air pipe 3 extending from the air compressor 8 is connected to the middle of the lift pipe 2. Therefore, the air sent from the air compressor 8 flows through the air pipe 3 and enters the lift pipe 2. When the air mixes with the water in the lift pipe 2, the specific gravity is reduced, so that the water in the lift pipe rises and enters the tank 9 of the suction wheel 4. Of course, the suction force of the suction wheel 4 works, so that the water is sucked up smoothly, and at the same time, the earth and sand deposited on the bottom of the well pipe is sucked up together with the water.

Here, it is also possible to suck up water and earth and sand through the lift pipe 2 only by the suction force of the suction wheel 4 without using the air compressor 8.
However, if the water in the well pipe runs out, the earth and sand 10 accumulated at the bottom cannot be sucked up. In the present invention, the return hose 5 is connected to the tank 9 in order to separate the water accommodated in the tank 9 through the lift pipe 2 from the earth and sand and return it to the well pipe 1 again.

FIG. 2 shows an example of the appearance of the suction wheel 4. A large tank 9 is mounted behind the driver's seat, and the tank 10 sucks up and stores the earth and sand 10 accumulated on the bottom together with the water in the well pipe. I can do it.
FIG. 3 is a specific example showing the internal structure of the tank 9. An iron plate 12 extending downward from the upper surface 11 is attached to the inside of the tank, and an inflow pipe 13 connected to the lift pipe 2 enters the tank, and its tip extends to the vicinity of the iron plate 12.

  Therefore, the earth and sand 10 are sucked up together with the well water 6 from the bottom of the well pipe 1, the well water 6 and the earth and sand 10 flowing out from the inflow pipe 13 hit the iron plate 12, and the earth and sand 10 having a large specific gravity can immediately settle on the bottom of the tank 9. . If the water level 14 of the water in the tank rises and reaches the discharge port 15 as shown in FIG. 3 (b), the return valve 16 is opened to flow the return hose 5 from the discharge port 15, and the well pipe 1 again. Returned to Therefore, the water level 7 in the well pipe does not decrease.

  The earth and sand 10 flows into the tank 9 together with the well water 6, and the earth and sand having a large specific gravity are deposited on the bottom of the tank 9, but the earth and sand 10 can be immediately precipitated by hitting the iron plate 12. Of course, the method for separating the earth and sand 10 and the well water 6 is not particularly limited.

1 Well Pipe 2 Lift Pipe 3 Air Pipe 4 Suction Wheel 5 Return Hose 6 Well Water 7 Water Level 8 Air Compressor 9 Tank
10 Earth and sand
11 Top view
12 Iron plate
13 Inflow pipe
14 Water level
15 Drainage port
16 Drain valve

Claims (4)

In the method of sucking up the sediment accumulated at the bottom of the well pipe, a lift pipe with an opening at the tip is inserted into the well pipe, and suction is performed by sucking earth and sand together with water from the opening at the tip of the lift pipe with a suction wheel placed on the ground. It is housed in a tank of a car, and the water and earth and sand contained in the tank are separated, and the water is discharged from the tank and returned to the well pipe, so that the water level in the well pipe does not decrease. Sediment suction method. The method for sucking up sediment at the bottom of a well pipe according to claim 1, wherein compressed air is sent to an air pipe connected in the middle of the lift pipe by an air compressor and supplied to the lift pipe. In the device that sucks up the sediment accumulated at the bottom of the well pipe, there is an opening at the tip of the lift pipe inserted into the well pipe, and the lift pipe is connected to the tank of the suction wheel placed on the ground, Sediment was sucked in together with water from the opening and stored in the tank, and the water and sediment were separated in the tank, and a return hose was connected to the tank to drain the water accumulated above a certain level and return it to the well pipe. Sediment suction device at the bottom of a well pipe. The earth and sand sucking device at the bottom of a well pipe according to claim 3, wherein an air pipe is connected in the middle of the lift pipe, and air is supplied to the lift pipe through an air pipe from an air compressor arranged on the ground.

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