JP6166218B2 - Method and apparatus for sucking up sediment from well bottom - Google Patents

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.
For example, in “Deep well pipe cleaning method and cleaning apparatus” according to Japanese Patent Application Laid-Open No. 2009-18214, a rotating body is pivotally supported 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 injection nozzle communicates with the ultra-high pressure water hose so that ultra-high pressure water is injected, and the injection nozzle injects ultra-high pressure water and rotates with the rotating body along with the injection, and further below the lower guide There is a net to accommodate mud and other dirt washed away by the water being sprayed.

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

  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 from an air pipe with the air compressor from the ground. 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 there is less eruption of earth and sand, the lift pipe is gradually lowered, and the earth and sand can be collected to a predetermined depth. However, if the mud or sediment deposited on the bottom of the well tube is hardened, it cannot be sucked from the tip of the lift tube.

In the air lift method, the groundwater accumulated in the well pipe can be sucked up, so that the earth and sand accumulated at the bottom can be sucked up at the same time.
On the other hand, regarding the method for removing mud and sediment deposited on the bottom of the well, various techniques have been developed in addition to the air lift method.

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.
"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, and even the hard and hard sediment at the bottom of the well pipe can be sucked up, and all the sediment can be obtained even if the ground water collected in the well pipe is small. Provided are a suction method and a suction device for depositing sediment at the bottom of a well.

  The method for sucking sediment 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 generally inclined, and an air pipe is connected in the middle, and the compressed air supplied from the air compressor on the ground to the air pipe flows to the lift pipe.

  A high-pressure water pipe is attached to the side surface of the lift pipe, and the high-pressure water pipe extends further downward from the tip of the lift pipe and is curved so as to be substantially concentric with the central axis. A nozzle body is attached to the tip of the high-pressure water pipe, and the nozzle body can be rotated by spraying high-pressure water from the nozzle of the nozzle body. A plurality of nozzles are attached to the nozzle body, and high-pressure water is jetted from each nozzle, whereby the earth and sand deposited on the bottom of the well pipe can be stirred and sucked from the tip opening of the lift pipe.

  The method of sucking up sediment deposited on the well bottom according to the present invention can suck up sediment deposited on the well tube bottom from the tip opening of the lift tube together with well water, as in the conventional air lift method. In the present invention, the high-pressure water pipe is extended downward from the tip of the lift pipe in order to make it easy to suck up the sediment. And by spraying high-pressure water from the nozzle attached to the tip of the high-pressure water pipe, the hard and solid deposit is broken and stirred, and in this state, mud and earth and sand can be sucked together with water from the opening at the tip of the lift pipe. .

  And since water is jetted from the nozzle to the bottom of the well, water is not lost, and the earth and sand deposited on the bottom together with this water can be sucked up by the lift pipe. Here, the high water pressure pipe is attached so as to be concentric with the central axis from the back side of the lift pipe (side inclined and extended), and for that reason, soil and sand are sucked together with water from the opening of the sloped lift pipe. It is made easy.

BRIEF DESCRIPTION OF THE DRAWINGS It is an Example which shows the earth and sand suction apparatus which concerns on this invention, (a) is a front view, (b) is a side view. The front view which shows the method of lowering earth and sand suction apparatus to the bottom part of a well pipe, and sucking up earth and sand. The side view which shows the method of lowering earth and sand suction apparatus to the bottom part of a well pipe, and sucking up earth and sand. 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 shows an embodiment of the earth and sand suction device according to the present invention, in which 1 denotes a lift pipe, 2 denotes a high water pressure pipe, and 3 denotes a nozzle body. The tip of the lift tube 1 is cut with an inclination with respect to the central axis, and therefore the opening of the lift tube 1 having a circular cross section is elliptical. The oval opening 4 is larger than the circular lift pipe cross section, and from the opening 4 it is possible to suck up mud and earth and sand as deposits together with water.

  The high-pressure water pipe 2 is attached to the back side 5 of the lift pipe 1 and extends curvedly from the tip of the inclined opening 4, and the tip of the high water pressure pipe 2 is arranged concentrically with the central axis of the lift pipe 1. The The nozzle body 3 attached to the tip of the high water pressure pipe 2 is rotatably supported, and the nozzle body 3 forms an inverted truncated cone shape, and a plurality of nozzles 7, 7. A nozzle 8 is also attached to the lower surface 9.

  The water flowing through the high water pressure pipe 2 is ejected from the nozzles 7, 7... And the nozzle 8, and the nozzle body 3 is caused by the reaction force of water ejected from the nozzles 7, 7. It is made to rotate. Therefore, the water sprayed from the nozzles 7, 7... Is inclined in the circumferential direction with respect to the radial direction of the nozzle body 3. Therefore, water is sprayed from the nozzles 7, 7,..., 8 to the periphery of the nozzle body 3, and hits the earth and sand deposited on the bottom of the well.

  2 and 3 show the case where the lift pipe 1 is inserted into the well and descends, and the earth and sand deposited on the bottom is sucked, FIG. 2 is a front view, and FIG. 3 is a side view. 10 in the figure is a well pipe, and earth and sand 11 are deposited on the bottom of the well pipe 10. Of course, the inner wall surface 12 of the well pipe 10 has rust, and the rust adheres with mud, but the earth and sand suction device according to the present invention is not a device intended for cleaning the inner wall surface 12.

  The lift pipe 1 is connected to the steel pipe 13 and descends to the bottom of the well pipe 10, and mud and earth and sand 11 deposited on the bottom can be sucked from the tip opening 4 of the lift pipe 1. An air pipe 14 is connected in the middle of the lift pipe 1, and the air flowing through the air pipe 14 from the air compressor enters the lift pipe 1, so that the specific gravity of the water inside the lift pipe is reduced, and the groundwater inside the well pipe is reduced. Pushed out to the ground with air.

  Therefore, the groundwater in the well pipe rapidly flows into the lift pipe from the opening of the tip of the lift pipe, but the earth and sand 11 that has become hard and accumulated so that the sand and gravel near the tip of the lift pipe can be entrained. 7 and the water sprayed from the nozzle 8 is broken and stirred. As shown in the figure, a concave portion 15 is formed when the nozzle body 3 descends in the central portion of the accumulated earth and sand 11, and the earth and sand 11 around the nozzle body 3 is sucked into the opening 4 of the lift pipe 1.

By the way, the high water pressure pipe 2 is fixed to places on the back side 5 of the lift pipe 1 by welding or a fastener, and is connected via a high pressure hose 16 extending from the ground and a connector 17. The nozzle body 3 rotates while jetting high-pressure water from the nozzles 7, 7,..., And the nozzle 8. The surrounding sediment is crushed finely, and the earth and sand 11 are sucked together with the groundwater by the lift pipe 1 and discharged to the ground. I can do it.
By the way, high pressure water is ejected from the nozzles 7, 7... So that mud rust adhering to the inner wall surface of the well pipe 10 can be removed.

DESCRIPTION OF SYMBOLS 1 Lift pipe 2 High water pressure pipe 3 Nozzle body 4 Opening 5 Back side 6 Outer side surface 7 Nozzle 8 Nozzle 9 Bottom surface
10 Well pipe
11 Earth and sand
12 Inner wall
13 Steel pipe
14 Air tube
15 recess
16 High pressure hose
17 Connector

Claims (2)

In the method of sucking up the sediment accumulated at the bottom of the well pipe, a lift pipe having an elliptical opening is inserted into the well pipe by cutting the tip at an inclination , and the lift pipe is inclined and extends long. A high water pressure pipe attached along the back side is extended downward from the tip, and high pressure water is jetted from nozzles attached to the outer and lower surfaces of an inverted frustoconical nozzle body rotatably supported at the tip of the high water pressure pipe. Te stirred crushed the deposit, by supplying to the lifting sending compressed air with an air compressor to the air tube connected to the middle of the lift pipe tube, sucks the sand with water through the opening of the lift tube tip A method for sucking up sediment at the bottom of a well pipe, characterized by sucking up on the ground. In a device for sucking up sediment accumulated at the bottom of a well pipe, along the lift pipe having an elliptical opening by cutting the tip at an inclination , and along the back side of the lift pipe extending slantly and long It has a mounting high pressure pipe, the high pressure tube extending from the lift tube tip downward, the outer surface of the nozzle at the tip of the high pressure pipe with placing the tip portion of the high pressure tube to the lift tube central shaft And a structure with an inverted frustoconical nozzle attached to the lower surface and rotatably supported, and an air pipe is connected in the middle of the lift pipe to send compressed air from the air compressor and supply it to the lift pipe. The earth and sand sucking device at the bottom of the well pipe is characterized by sucking earth and sand together with water from the opening at the tip of the lift pipe and sucking it up to the ground.

Images