JP3514856B2 - In-pipe cleaning device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe washing apparatus for eliminating clogging of a stratum around a water collecting hole of a well in a well or a well. 2. Description of the Related Art When groundwater is sucked and pumped, groundwater in the stratum outside the water absorption hole is sucked and pumped up. However, the underground layer is clogged by the flow of water at the time of the water absorption, and the water is absorbed. The amount may decrease. [0003] In the case of a well or well, this is because the absolute inflow area of the area of the catchment hole into which groundwater flows in is insufficient with respect to the amount of water intake, which is several times larger than the permeability coefficient (flow velocity) in the aquifer.
Since groundwater is drawn into the pipe at several dozen times the inflow speed, fine coarse sediment in the aquifer moves together with the water and concentrates in backfill gravel inside the well or outside the well, Over the years, the sedimentation has expanded, reaching the aquifer outside the backfill gravel, clogging the entire perimeter and consolidation. In such a case, clogging is removed by means such as washing. For example, FIG.
As shown in FIG. 4, water is supplied to the nozzle c from the ground through a pipe b by a pressure pump from the ground, and the pressure water is sprayed radially from the nozzle hole d for washing, or iron, manganese, etc. When the scale is accumulated on the inner wall of the pipe, a method of dissolving the scale by adding a chemical and washing the dissolved matter by suction and pumping is generally used. [0005] In these methods, the removal of scale in the pipe and the clogging occurring in the aquifer in the pipe, that is, obstruction of water flowing in the pipe of groundwater due to dense accumulation of fine particles around the outer wall of the pipe,
Alternatively, the object is to eliminate an obstacle due to consolidation of the stratum or an obstacle due to scale. [0006] However, the above-mentioned method can remove the scale attached to the strainer in the pipe or the screen or the water collecting hole, but it is possible to reduce the water intake amount in the drill well. The main cause is clogging of the aquifer outside the pipe, and the groundwater flowing in the aquifer does not pass through the aquifer even if the pipe is completely washed, Inflow into the pipe is not possible and therefore does not increase the water intake. Therefore, there is a high-pressure washing method using high pressure. However, in this method, a considerable amount of water pressure is applied, the washing is performed by spraying through water, and the water is sprayed into groundwater. Pressure in the water is reduced in water, clogging in the extra-aquifer as predicted by the desk calculations is only a small part of the extra-external aquifer, and high-pressure water is extruded through the 100% catchment holes. It is impossible to inject it. [0008] Although it is not possible in practice, even if cleaning can be performed through all the holes from the water collecting holes, the time spent for cleaning is immeasurable, and as a result, the cleaning cost increases. Needless to say. In any case, in the above-mentioned cleaning method, even in existing wells or the like where the water intake is reduced due to clogging in the aquifer outside the pipe or in the backfilling layer, depending on the results. At present, the effect has hardly appeared. In short, even if high-pressure water is sent into water and jetted as shown in FIGS. 3 and 4, the high-pressure water once discharged into the water from the nozzle is weakened due to the high resistance in water, Due to the resistance of the gravel that is contained, the distance of spraying or discharging water outside the pipe is limited, so the clogging of the gravel that is backed outside the pipe and the aquifer outside it The effect of eliminating clogging occurring inside is small. In addition, the size of the device body for injecting high-pressure water from the nozzle hole is at most about 150 mmφ,
When cleaning the inside of a large-diameter well tube, the longer the distance to the inside of the tube, the greater the resistance in water and the lower the water pressure. [0012] The fact that the size of the equipment is limited means that it becomes difficult to pull up and collect the equipment main body when sediment or small pebbles being washed is deposited on the upper part of the equipment main body or small pebbles are caught on the side surface. It seems to be considering. In this method, it is necessary to secure the water to be supplied, and if it is not possible to make it at the site, it will be secured by a tank truck or the like, and the construction cost will increase. The applicant has disclosed in Japanese Utility Model Publication No. 3-52848 to solve the problem of clogging in the gravel filled as backfill outside the pipe and clogging in the outer aquifer. However, this technique has not been sufficiently effective in eliminating clogging between gravel outside the well pipe. That is, since there is no forced discharge of the water surface pressure flow, the above-mentioned disadvantage has not been completely solved. The present invention provides an in-pipe washing apparatus capable of solving all the drawbacks of conventional washing in a well, including the technique disclosed in the above-mentioned publication, to increase the amount of water taken and to recover the water level. It was made for the purpose. In order to achieve the above object, the present invention provides a motor case which is inserted into a well pipe from above and has a built-in motor, and is provided on an outer peripheral surface of the motor case so as to be freely expandable and contractible. A stopper serving as a steady rest in contact with the inner wall of the well tube, and a cleaning device main body directly connected to the motor shaft at the lower end of the motor case, and the cleaning device main body includes a support rod connected to the motor shaft; It has a screw fixed to the lower end of the support rod, and a tube provided on the upper part of the screw so as to surround the support rod. Is characterized by having at least one brush having an outer diameter as close as possible to the inner wall of the well tube. According to the above construction, the motor case inserted into the well pipe is held at that position by expanding and pressing the stopper so as to contact the inner wall of the well pipe, and rotating the motor. As a result, the brush rotates and removes scales and the like adhering to the inside of the well tube, and the descent of the main body of the washing machine causes a water surface pressure on the underwater surface in the well tube, which reduces clogging and consolidation. Furthermore, the water surface pressure flow can be discharged from the inside of the well tube to the outside by the centrifugal force due to the rotation of the screw. The present invention will be described below with reference to an embodiment shown in the drawings. As shown in FIG. 1, the in-pipe cleaning device according to the present invention is inserted into a well pipe 1 from above and provided with a motor case 2 having a built-in motor and an outer peripheral surface of the motor case 2 scalable. A stopper 3 serving as an anti-sway in contact with the inner wall of the well tube 1; and a cleaning device main body 5 directly connected to a motor shaft 4 at a lower end of the motor case 2. A support rod 6 connected to the support rod 6, a screw 7 fixed to a lower end of the support rod 6, and a tube 8 provided above the screw 7 so as to surround the support rod 6. 8 is provided with a large number of drain holes 9 around the lower part thereof, and two upper and lower brushes 10 having outer diameters as close as possible to the inner wall of the well tube 1 on the outer periphery of the lower part. Here, the motor is driven via an electric wire 12 connected to an inverter 11 whose rotation speed is adjustable. The stopper 3 provided on the outer peripheral surface of the motor case 2 is a pantograph-type stopper composed of a plurality of members. When the stopper 3 is expanded, the stopper 3 presses the inner wall of the well tube 1 to move the motor case 2 to the position. The roller 3a can be held in contact with the inner wall of the well pipe 1 without swinging, and when it contracts, it comes away from the inner wall of the well pipe 1. When it is difficult to hold the roller 3a on the friction surface, the shoe 13 may be interposed between the roller 3a and the inner wall of the well tube 1 to widen the friction surface. The stopper 3 is designed so as not to be caught by irregularities in the well tube 1 when the motor case 2 including the lower cleaning device main body 5 is moved up and down. A flange 4a is provided at the lower end of the motor shaft 4 of the vertical motor built in the motor case 2, and the flange 6a of the support rod 6 of the same diameter cleaning device main body 5 that is in contact therebelow is bolted. Combined and integrated. The brush 10 provided on the tube 8 of the cleaning device main body 5 is a wire brush, and has a gap between its outer periphery and the inner wall of the well tube 1 such that it can rotate in the outer peripheral direction. The screw 7 is provided below the brush 10 in a downward direction. Next, the operation will be described. In FIG. 1, a backfill gravel layer 15 and an aquifer layer 16 of appropriate thickness are provided on the outer side of the well tube 1 as shown in FIGS. A plurality of water collecting holes 1a communicating with the circumference are provided. When the motor case 2 in which the cleaning device main body 5 is suspended from above the well tube 1 is inserted into the inside and the stopper 3 is expanded, the motor case 2 is fixed to an arbitrary position in the well tube 1. After that, when the vertical motor in the motor case 2 is driven, the main body 5 of the washing machine is rotated, so that the scale such as scale, iron, manganese and the like adhering to the inner wall of the well tube 1 is removed by the brush 10 which rotates together. At the same time, a water surface pressure is generated below the brush 10, and a centrifugal force is applied to the water surface pressure by the blade 7a of the rotating screw 7, so that the water below the brush 10 is reduced by the centrifugal force. The water is discharged from the water collecting hole 1a to the gravel layer 15 and the aquifer 16 as a current. Further, since the cleaning device main body 5 is also lowered by sequentially lowering the motor case 2, water scale, rust and the like at a deeper position can be continuously removed. The scale such as scale and rust removed by the brush 10 in this manner is collected in the tube 8, but the water is removed from the tube 8 through the drain hole 9, and when the main body 5 of the cleaning device is pulled up. Only solids are processed above ground. As a result, the area of the water collecting hole 1a becomes the original size, and the filling portion of the gravel layer 15 and the aquifer 16 expands due to the clogging and the solidified space between the gravel and the gravel. Separation of sand and sand also eliminates clogging of these layers, which increases groundwater inflow. According to experiments, when the in-pipe washing apparatus according to the present invention was used, a result was obtained which was 1.7 to 2.5 times the pumping amount and pumping level before use. . FIG. 2 shows another embodiment in which the two brushes 10, 10 of FIG. 1 are arranged at appropriate intervals. In this case, the two brushes 10, 10 are inclined in the same direction as the screw 7 between the brushes 10, 10. A blade 17 is provided to positively eliminate the hydraulic flow. As described above, the present invention is, as described above, a motor case which is inserted into a well pipe from above and has a motor built therein, and is provided on the outer peripheral surface of the motor case so as to be freely expandable and contractable. A cleaning device main body directly connected to a motor shaft at a lower end of a motor case, the cleaning device main body includes a support rod connected to the motor shaft, and a lower end of the support rod. And a tube provided on the upper portion of the screw so as to surround the support rod.A large number of drain holes are provided around the lower portion of the tube, and the outer periphery of the lower portion is provided with the above-mentioned tube. Since at least one brush having an outer diameter as close as possible to the inner wall of the well tube is provided, in addition to cleaning the inner wall of the well tube by the brush, the centrifugal force of the rotating screw is used to rotate the motor by rotating the motor. The pressure flow is released, so that not only the inside of the well pipe but also the clogging of the backfill gravel layer and the aquifer can be removed. As a result, the amount of water intake can be increased and the water level can be recovered.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall layout view showing one embodiment of a pipe cleaning apparatus according to the present invention. FIG. 2 is a perspective view showing another embodiment of the main part of the cleaning device of FIG. 1; FIG. 3 is a side sectional view showing a cleaning state by a conventional in-pipe cleaning apparatus. FIG. 4 is a plan view of FIG. 3; [Description of Signs] 1 Well tube 2 Motor case 3 Stopper 4 Motor shaft 4a Flange 5 Washer body 6 Support rod 6a Flange 7 Screw 8 Tube 9 Drain hole 10 Brush 13 Shoe 14 Bolt

Claims (1)

(57) [Claim 1] A motor case which is inserted into a well pipe from above and has a motor built therein, and is provided on the outer peripheral surface of the motor case so as to be freely expandable and contractable, and comes into contact with the inner wall of the well pipe. A cleaning device main body directly connected to a motor shaft at a lower end of a motor case, the cleaning device main body being fixed to a support rod connected to the motor shaft, and a lower end of the support rod. And a tube provided on the upper part of the screw so as to surround the support rod. A number of drain holes are formed around the lower part of the tube, and the inner wall of the well tube is formed on the outer circumference of the lower part. An in-pipe cleaning device comprising at least one brush having an outer diameter as close as possible to the above.