JP2006291467A - Method for clearing clogging in existing well - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To renew an existing well including a steel casing pipe inserted into an excavation hole and a water collecting part provided in the casing pipe, by liberating a clogged solid object, and pumping up the stagnant water and the solid object together from the inside of the casing pipe to the ground surface at the same time, when malfunction of flow in the water collecting part is caused by clogging and the well water becomes sluggish. <P>SOLUTION: Clogging of the existing well is cleared in the following manner. Namely, in the existing well 6 in which the casing pipe 2 is inserted into the excavated hole 1 and the ground water 5 is collected from the water collecting part 3 of the casing pipe 2, a hollow rod 7 is brought down into the water in the water collecting part 3 of the casing pipe 2. Ultrahigh pressure water 8 and pressurized air 9 are discharged from a lower part of the rod 7 to an inner peripheral surface of the water collecting part 3 so that the water in the water collecting part 3 is brought up to the ground surface together with air bubbles 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the existing well in which a well hole is excavated below the groundwater level, a steel casing pipe is inserted into the well hole, and groundwater is collected from the porous water collecting portion of the casing pipe. It is related with the technique which cleans the clogging of a part (strainer) and recovers the water collection in a well (in the said casing pipe | tube).

  Conventionally, a strainer pipe for collecting water was inserted along the hole wall of a deep well excavated in the ground, and the groundwater was pumped up to the ground via the strainer (Patent Document 1).

  When the above-mentioned strainer and / or the gravel layer or bean gravel placed on the outer periphery of the strainer is clogged with mud, sand, or water, etc. Need to promote.

  In order to prevent or clean the clogging, high pressure water is sprayed from the lower end of the water injection pipe to the inner peripheral surface of the strainer to remove clogging, and the clogged solids and water are pumped to the ground using an underwater pump ( Patent Document 2).

  In place of the submersible pump, an air supply hose is inserted into the pumping pipe, and the well water that has entered the pumping pipe is pumped to the ground by rising bubbles discharged from the lower end of the hose (Patent Document 3).

JP-A-7-279572 JP 2001-193106 A JP-A-7-247552

  The present invention provides an existing well in which a water collecting part is provided in a steel casing pipe inserted into a drilling hole, and when the water collecting part becomes poor in water permeability due to clogging and the well water stagnates, the clogged solid matter is removed. The purpose is to pump up stagnant water and clogged solids from the inside of the casing pipe to the ground at the same time as they are released, and measure the rejuvenation of existing wells.

In order to achieve the above object, the present invention firstly inserts a casing pipe into a borehole and collects groundwater from the water collecting part of the pipe, and in the well in the water collecting part of the casing pipe is hollow. An existing rod characterized in that the rod is lowered, ultra-high pressure water and pressurized air are discharged from the lower part of the rod toward the inner peripheral surface of the water collecting portion, and the water in the water collecting portion is raised to the ground together with bubbles. Clogging cleaning method in a well,
Secondly, the clogging cleaning method in the existing well according to the first invention, in which a gravel material is disposed along the outer periphery of the water collecting portion,
Thirdly, the clogging cleaning method in the existing well according to the first or second invention, wherein the water that has passed through the water collection part rises along the outer periphery of the water collection part, and the water recirculates again into the water collection part
Consists of.

  Therefore, even if groundwater tries to enter the casing pipe from the water collecting section, the well water is stagnant due to a poor approach rate due to clogging.

  Therefore, the hollow rod is lowered from the ground into the water collecting portion of the casing pipe, and ultrahigh pressure water and pressurized air are simultaneously discharged from the lower end portion to the inner peripheral surface of the water collecting portion.

  In this way, ultra-high pressure water and pressure air release clogged solids in the water collection section between the water collection section and the well excavation wall, and the released solids accompany bubbles in the pressure water and pressure air. As a result, the inside and outside of the water collecting portion rises, and the outside rising water returns to the water collecting portion again.

  In the water collection part, refluxing ultra-high pressure water and the upward flow of bubbles are generated, and free solids are raised accordingly, and the operation to be discharged to the ground is performed, and the water collection part has water permeability. Recover.

In the present invention, the clogging solids in the water collecting part in the existing well by the casing pipe is released by passing ultrahigh pressure water,
It is possible to activate the well water that has been stagnated by being able to recirculate in the upward flow caused by bubbles in the well.

  A well excavation hole 1 (diameter of about 150 to 300 mm + α) is excavated from the ground 12 into the ground 13, and a casing pipe 2 having a diameter of about 100 to 300 mm is inserted into this, and between the pipe 2 and the hole wall (α mm portion) A gravel (bean gravel) material 4 is inserted into the pipe 2 and a water collecting hole 3 'is formed in the pipe 2 to form a water collecting portion (strainer) 3. Immediately thereafter, an existing well is formed.

  The water collecting hole 3 ′ is drilled over the entire length of the casing pipe 2 or is gathered at the lower end of the pipe 2 to form a water collecting portion (strainer) 3 at the full length or the lower end.

  The depth of the casing pipe 2 is several meters below the level of the groundwater 5, and the groundwater 5 enters the casing pipe 2 from the gravel material 4 through the water collecting portion 3 and stores well water 5 '(FIG. 3). ).

  When the water collecting hole 3 ′ of the water collecting section 3 and the gap 4 ′ (FIG. 1) of the gravel material 4 are clogged with mud, sand, water or the like and the water permeability is lost, the well water 5 ′ 'Is stagnant and becomes an existing well 6 that is not applicable to drinking water.

  In the existing well 6 in this state, the hollow rod 7 is supported by the turning and sliding device 14 ′ of the boring machine 14 disposed on the ground 12 so as to be rotatable and slidable in the vertical direction. The hollow rod 7 is lowered into the water part (strainer) 3.

  The hollow rod 7 is propelled into the well water 5 'of the existing well 6 so that the lower end of the hollow rod 7 is in contact with the bottom surface 6' of the existing well 6. At that position, the hollow rod 7 moves around the center line c to the boring machine 14 To rotate in the direction of arrow a (FIG. 3).

  A swivel 7 ′ provided at the upper end of the hollow rod 7 is suspended and supported by a liftable suspension hook 15, and the hollow rod 7 is moved in the direction of arrow a through the turning and sliding device 14 ′ of the boring machine 14. It is as described above that it can be rotated.

  As shown in FIG. 2, a water tank 17 is connected to a receiving port 16, 16 provided in the swivel 7 ′ via a pipe 18 via a super high pressure water pump P, and a pressure air device (air compressor) A is connected to the other receiving port 19. Are connected by a pipe 20 via a receiver R.

  As shown in FIG. 4, the swivel 7 ′ forms double water feeding parts 16 ′, 16 ′ connected to the receiving ports 16, 16, and forms an air feeding part 21 connected to the receiving port 19. Double water supply units 16 ′, 16 ″ and air supply unit 21 ′ connected to the double water supply units 16 ′, 16 ′ and the air supply unit 21 are formed.

The double water supply section 16 ″, 16 ″ of the hollow rod 7 is connected to the ultra high pressure water nozzles 22, 22 at the lower end, and the air supply section 21 ′ is connected to the pressure air nozzle 23 provided at the lower end,
Ultra high pressure water 8 having a water pressure of 100 to 400 kg / cm ² can be discharged or ejected from the ultra high pressure water nozzles 22, 22 toward the inner surface of the water collecting section 3, and the water pressure is appropriately determined according to the water depth of the existing well 6. .

  Further, the pressure air 9 stronger than the water pressure at the depth is discharged or ejected from the pressurized air nozzle 23 toward the inner surface of the water collecting section 3 simultaneously with the ultrahigh pressure water 8.

  The discharged ultra-high pressure water 8 removes clogged solid matter blocking the water collecting hole 3 ′ of the water collecting section 3 and the gap 4 ′ of the gravel material 4 from the inside of the water collecting section 3 or from the inside to the gravel material 4 side. The released solid matter rises outside the water collecting hole 3 ′ of the water collecting portion 3 or between the gaps 4 ′ of the gravel material 4.

  In this state, the pressurized air 9 discharged from the pressurized air nozzle 23 enters the gap 4 'of the gravel material 4 from the water collecting hole 3' and rises. And it becomes the bubble 10 along the inner surface of the water collection part 3 and the inner surface of the casing pipe | tube 2, rises in water, and forms the upward flow 11 (FIG. 1).

  This upward flow 11 appears as a so-called air pump phenomenon due to the rise of the bubbles 10 discharged from the pressure air nozzle 23 and forms a pressure reducing portion along the upper portion of the strainer 3 and the inner surface of the casing tube 2. The clogged solids and water that have entered the outside of the water 3 return to the strainer 3 in the direction of the arrow c again from the water collecting hole 3 ′, rise to the ground along with the upward flow 11, and drainage grooves provided on the ground 12. 24 (FIG. 2) overflows, and the water in the casing pipe 2 and the strainer 3 is continuously discharged to the ground 12, and the groundwater 5 in the ground 13 flows into the gap between the strainer 3 and the gravel material 4 along with this phenomenon. 4 'enters into the casing pipe 2, the stagnant water in the casing pipe 2 is made into the upward flow 11, the stagnant water is replaced with the ground water 5, and the function of the strainer 3 is restored.

  After the recovery, the ultra high pressure pump P and the air compressor A are stopped, the open / close valves of the pipes 18 and 20 are closed, and then the swivel 7 'and the hollow rod 7 are grounded by the operation of the boring machine 14 and the operation of the lifting hook 15. 12, the pumping pipe (not shown) is inserted into the existing well 6 and fresh water can be pumped to the ground by a pump (not shown).

  A rotation vibration prevention guide guide 26 and an inner peripheral surface cleaning brush 27 are provided at the lower part of the hollow rod 7 via an arm 25, and the clogging in the water collecting hole 3 'of the strainer 3 is caused by the horizontal rotation sliding of the brush 27. Solids can be liberated auxiliary.

  Since the present invention is based on the above-described method, the stagnation of water due to clogging of the strainer 3 in the existing well 6 is improved, and the groundwater 5 of the ground 13 is smoothly passed through the strainer 3 or the gravel material 4. At the same time, the stagnant water can be discharged to the ground 12 by the air pump phenomenon caused by the bubbles 10.

It is a longitudinal cross-sectional view which shows the clogging cleaning state in the existing well by this invention. It is the whole longitudinal cross-sectional view of FIG. It is a side view which shows the rotation and sliding apparatus of the hollow nozzle by a boring machine. It is a longitudinal cross-sectional view of a hollow rod and a swivel part. It is a longitudinal cross-sectional view of a hollow rod and a swivel part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation hole 2 Casing pipe 3 Catchment part 3 'Catchment hole 4 Gravel material 5 Ground water 6 Existing well 7 Hollow rod 8 Super high pressure water 9 Pressure air 10 Bubble 11 Upflow

Claims (3)

In an existing well that inserts a casing pipe into the borehole and collects groundwater from the water collection part of the pipe,
The hollow rod is lowered into the water in the water collecting part of the casing pipe, and ultrahigh pressure water and pressure air are discharged from the lower part of the rod toward the inner peripheral surface of the water collecting part,
A clogging cleaning method in an existing well, wherein the water in the water collecting part is raised to the ground together with air bubbles.   The clogging cleaning method in the existing well according to claim 1, wherein a gravel material is disposed along the outer periphery of the water collecting portion.   The clogging cleaning method in the existing well according to claim 1 or 2, wherein the water that has passed through the water collecting part rises along the outer periphery of the water collecting part, and the water recirculates again into the water collecting part.

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