JPH0246549Y2 - - Google Patents

Description

[Detailed explanation of the invention] a. Purpose of the invention (industrial field of application) The borehole holder according to this invention is used to drill holes underground for the purpose of geological surveys or environmental pollution surveys. When the pump is inserted into a drilled borehole and pumps groundwater from deep underground to the surface, it is used with a pair of sealing devices sandwiching the top and bottom of the pump. Avoid mixing.

(Conventional technology) For example, when conducting an environmental survey near a nuclear power plant, a borehole is drilled underground, a pump is inserted into the borehole, and groundwater is pumped up from deep underground. We are conducting an analysis of

The boreholes that are drilled when conducting such environmental surveys are narrow, with an inner diameter of about 54 mm, for example, and a small pump is inserted into the borehole to pump the groundwater that seeps into the borehole to the surface. I'm trying to collect it. When such groundwater sampling operations are carried out, it is necessary to prevent groundwater from mixing in boreholes at different depths. For this reason, conventionally, sealing devices with an outer diameter that can expand and contract are inserted into the upper and lower positions of the pump inserted into the borehole, and when the pump is operated, the cross section of the borehole is blocked by the upper and lower positions of the pump, and the Groundwater that has seeped into the borehole is prevented from flowing vertically along the borehole. By the way, conventional sealing devices expand and contract the outer diameter by supplying and discharging pressure oil, so it takes a long time to connect the sealing device inserted into the borehole and the pressure oil supply device on the ground. It was connected with a hose for supplying and draining pressure oil.

However, such conventional borehole sealing devices require a pressure oil supply device and a long pressure oil hose to connect this device and the sealing device, which increases manufacturing costs and makes handling difficult. Therefore, it is undesirable.

The borehole sealing device of the present invention eliminates the above-mentioned disadvantages.

b. Structure of the invention (means for solving the problem) The bore hole sealing device of the invention is structured as shown in FIG.

That is, the bracket 2 fixed to the upper end of the cylinder 1
A waterproof motor 3, which can be freely switched between forward and reverse rotation, is fixed to the top surface of the motor. Rotating shaft 4 of this motor 3
is inserted into the upper end of the cylindrical body 1 through the bracket 2. The upper end of a threaded rod 5 inserted into the cylindrical body 1 is connected to the rotating shaft 4, so that the threaded rod 5 can be rotated by energizing the motor 3. An elevating tube 6 is inserted into the cylinder body 1 together with the screw rod 5. This elevating tube 6 can freely slide only in the vertical direction without rotating within the cylinder body 1, and the male thread carved on the outer peripheral surface of the threaded rod 5 is fixed to the upper end of this elevating tube 6. It is screwed into the screw hole 8 at the center of the nut piece 7.

Furthermore, the upper end of a rod 9 is connected and fixed to the lower end of the elevating cylinder 6. This rod 9 has a cylindrical body 1
It passes through the lower end of the rod 9 and the center of a disc-shaped flange plate 10 fixed to the lower end of the cylinder 1. A restraining plate 11 is fixed. Furthermore, the upper surface of this holding plate 11 and the flange plate 10
A rubber block 12 having a cylindrical outer periphery is sandwiched between the lower surface of the rubber block 12 and the lower surface of the rubber block 12 . This rubber block 12
and the outer diameter of the flange plate 1 in its free state.
0 and the outer diameter of the restraining plate 11 are the diameters of the bore hole 13 (second
The inner diameter of the hole 13 is made slightly smaller than the inner diameter of the hole 13 shown in FIG.

(Function) When using the borehole sealing device of the present invention configured as described above, the function of the sealing device when pumping groundwater that has leaked to a predetermined depth within the borehole to the ground is as follows. That's right.

First, prepare two sealing tools 14 as shown in FIG. 1, and as shown in FIG. Insert the tools 14, 14 into the borehole 13. At this time, the pump 16 and the motor 3 of the sealing devices 14, 14 are connected to the controller 18, which includes a ground power source, etc., using conductive wires 15, 15.

Once the pump 16 and the sealing devices 14, 14 located above and below this pump 16 have been positioned, the motor 3 of each sealing device 14, 14 is energized to unscrew the threaded rod 5 of each sealing device. The flange plate is fixed to the upper surface of the holding plate 11 and the lower end of the cylinder body 1 by rotating the holding plate 11 in the direction indicated by the solid line in the drawing through the elevating tube 6 and the rod 9 to the position indicated by the chain line. 10. Narrow the distance from the bottom surface of 10. As a result, the outer peripheral surface of the rubber block 12 held between the plates 10 and 11 bulges outward as shown by the chain line in FIG. The outer peripheral surface and the inner peripheral surface of the borehole 13 are in close contact.

Once the outer circumferential surfaces of the rubber blocks 12 of the upper and lower sealers 14, 14 are brought into close contact with the inner circumferential surface of the borehole 13, the pump 16 held between both sealers 14, 14 is energized, and the upper and lower sealers 14, 14 are connected. Sealing tool 1
A pump 16 pumps up groundwater that has seeped into the borehole 13 at a depth between the holes 4 and 14.
and send it to the ground through the liquid supply hose 17.
It is collected in a container 19.

At this time, in order to prevent the conducting wires 15, 15 and the liquid feeding hose 17 from being pinched between the outer peripheral surface of the rubber block 12 of the upper sealing member 14 and the inner peripheral surface of the borehole 13, in the illustrated example, the second The rod 9 of the sealing device 14 located on the upper side of the figure is made into a hollow tube shape, and the conductive wires 15, 15 from the liquid feeding hose 17 and the pump 16 to the lower sealing device 14 are passed through the inside of the rod 9.

Note that the means for freely engaging the elevating cylinder 6 into the cylinder body 1 by sliding only in the vertical direction include the engagement between a commonly known key and a keyway, as well as the means for engaging the elevator cylinder 6 with the inner circumference of the cylinder body 1. The cross-sectional shape with respect to the outer periphery of the elevating tube 6 may be non-circular, and both surfaces may be brought into sliding contact.

c. Effects of the invention The borehole sealing device of the present invention is constructed and operates as described above, but although it has a simple structure and can be manufactured in a small size, it cannot reliably seal the cross section of the borehole. This makes it possible to efficiently perform special tasks such as extracting groundwater from deep underground.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing the pump of the present invention, and FIG. 2 is a longitudinal sectional view of a borehole showing the pump in use. 1: Cylindrical body, 2: Bracket, 3: Motor, 4:
Rotating shaft, 5: Screw rod, 6: Lifting tube, 7: Nut piece, 8: Screw hole, 9: Rod, 10: Flange plate, 11: Holding plate, 12: Rubber block, 13:
Borehole, 14: Sealing tool, 15: Conductor, 1
6: Sump pump, 17: Liquid feed hose, 18:
controller.

Claims (1)

[Scope of utility model registration request] A motor fixed to the upper end of the cylindrical body that can freely change the direction of rotation, a screw rod inserted into the cylindrical body and rotationally driven by the motor, and a nut piece inserted into the cylindrical body so as to be able to freely slide only in the vertical direction and fixed to the upper end. and the above-mentioned screw rod are screwed together, a rod fixed to the lower end of the elevator cylinder, a flange plate fixed to the lower end of the cylinder, and a lower end of the rod protruding downward from the cylinder. A borehole sealing device comprising a restraining plate fixed to the flange plate, and a rubber block held between the upper surface of the restraining plate and the lower surface of the flange plate.