JP2003139664A - Groundwater-sampling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a groundwater-sampling apparatus by which a sampling operation is performed easily, by which a groundwater can be sampled in a short time and whose reproducibility is enhanced. SOLUTION: The groundwater-sampling apparatus is constituted of a sealed water storage tank 6 which comprises a groundwater-sampling port 4 at its tip and whose tip part is equipped with a conical tube 5 with an internally installed water shutoff ball valve 3 used to open or close the port 4, a vacuum tank 5 connected to the tank 6 via a longer hose 9, a vacuum pump 17 connected to the vacuum tank 15 via a pipe 16, a longer rope 9 connected to the tank 6 and a stopper 1 which is mounted on the conical tube 5 and which has a mudguard function.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a groundwater sampling device for investigating the quality of groundwater.

[0002]

2. Description of the Related Art Recently, pollution of groundwater due to industrial wastewater, particularly pollution due to dioxin, has occurred. It is said that a device for measuring the concentration of dioxins in such groundwater is preferably made of metal or glass, and the groundwater to be sampled is 20 m to 50 m underground and clear groundwater samples are collected from a deep place.

FIG. 4 shows a conventional groundwater sampling device.
As shown by, has a sampling port 32 for groundwater sample at the tip,
A sealed water storage tank 6 having a conical cylinder 31 in which a water blocking ball valve 313 for opening and closing the sampling port 32 is provided at a tip end portion thereof.
Combine the long rope 34 (which is called baler),
For example, this is lowered into the groundwater of the deep well 35 and a groundwater sample is pumped up.

[0004]

SUMMARY OF THE INVENTION In the above-mentioned conventional device,
The sampling operation is repeated 60 times or more for each sample. By moving the water storage tank 6 up and down 60 times or more, the well water is agitated and the mud at the bottom of the well rises to affect the dioxin measurement.
Moreover, there is a problem that it takes a lot of time for sampling.

It is an object of the present invention to provide a groundwater sampling device which facilitates the sampling operation, can perform sampling in a short time, and has improved reproducibility.

[0006]

The present invention for attaining the above object has, as described in claim 1, a groundwater sample collecting port at an end, and a water blocking ball for opening and closing the collecting port. A sealed water storage tank having a conical cylinder with a valve installed at the tip, a vacuum tank connected to the water storage tank via a long hose, and a vacuum pump connected to the vacuum tank via piping. It is characterized in that it is composed of a long rope connected to the water storage tank and a stopper having a mudguard function attached to the conical cylinder.

As described in claim 2, the water ball valve for opening and closing the sampling port is pressed against the sampling port by a spring whose spring pressure is adjusted by the adjusting means.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] In FIG. 1, reference numeral 6 is a sealed water storage tank for collecting groundwater samples. The water storage tank 1 is provided with a conical cylinder 5 at the tip thereof, has a sampling port 4 at the tip of the conical cylinder 5, and a water shutoff ball valve 3 for opening and closing the sampling port 4 is internally provided. Reference numeral 7 denotes a lid attached to the upper part of the water storage tank 1, and a hook 8 provided on the lid 7
A long rope 9 is connected to the.

The conical cylinder 5 is equipped with a fixed stopper 1 having a mudguard function such as a filter and a movable stopper 1a. The fixed stopper 1 is attached to the conical cylinder 5, and the movable stopper 1a is fitted in the fixed stopper 1 so as to be able to extend and contract, and is fixed by a screw 2 at the extension and contraction position.

The lid 7 of the water storage tank 1 has a water storage tank 1
A pipe 10 communicating with the inside is attached, and the pipe 10 is provided with a first valve 11. The pipe 10 and the vacuum tank 15 are connected by a long hose 13. This hose 13 has a second valve 1
4 are provided. Further, a vacuum pump 17 is connected to the vacuum tank 15 by a pipe 16, and the pipe 16
Is provided with a vacuum meter 21.

[0011]

[Embodiment 2] The water shutoff ball valve 3 of Embodiment 1 has a structure in which the sampling port 4 is opened and closed by water pressure and its own weight.
The second embodiment has a structure in which a spring whose spring pressure is adjusted by an adjusting unit is pressed against the sampling port 4. A specific embodiment thereof will be described with reference to FIG.
That is, a spring 24 is placed on the upper surface of the water shutoff ball valve 3, and its position is adjusted in the vertical direction by a screw 23 on a plate 21 fixed in the conical cylinder 5 as a means for adjusting the pressure of the spring 24. The pressing plate 22 is supported, and the pressing plate 22 is brought into contact with the spring 24.

Since the present invention has the above-described structure, for example, when collecting water from a deep well, the first valve 11 on the pipe 10 and the second valve 14 on the vacuum tank 15 should be opened. Gently lower the water storage tank 6 into the groundwater via the rope 9, and fix the fixed stopper 1 and the movable stopper 1a.
Reaches the bottom of the well. The fixed stopper 1 and the movable stopper 1a serve to keep the distance between the sampling port 4 and the well bottom constant together with the mudguard action. Therefore, by expanding and contracting the movable stopper 1a with respect to the fixed stopper 1, the distance between the sampling port 4 and the well bottom can be appropriately adjusted as necessary.

The stoppers 1 and 1a are lowered into the groundwater through the rope 9, and the first valve 11 on the pipe 10 and the second valve 14 of the vacuum tank 15 in which the vacuum pressure is stored by the vacuum pump 17 are opened. The vacuum pressure of the vacuum tank 15 is applied to the water storage tank 6.

In the water storage tank 6 dropped into the ground water, the water stop ball valve 3 is pushed up by the water pressure to open the sampling port 4, and ground water of the same level as the ground water in the well is stored in the water storage tank 6. Further, by operating the vacuum pump 17, the ground water is sucked by the vacuum pressure to fill the water tank 6 with the ground water. At this time, the water level in the water storage tank 6 can be inferred by the vacuum meter 21.

It is confirmed by the vacuum meter 21 that the target sampling amount has been reached as described above, the second valve 14 operable on the ground is closed, and the rope 9 is used to store the water tank 6
Is pulled out of the well, the first valve 11 on the pipe 10 is closed while the vacuum pump 17 is operating, the second valve 14 is opened, the hose 13 is removed from the pipe 10, and the water storage tank 6 is turned upside down. The upper first valve 11 is operated to store a groundwater sample in an arbitrary sampling container. By continuing this operation, a predetermined amount of groundwater sample can be obtained in a short time without vertically moving the water storage tank 6 60 times or more as in the conventional case.

The water shutoff ball valve 3 structure of the second embodiment is as follows:
By adjusting the spring pressure according to the water pressure that varies depending on the water depth, the ball valve 3 for stopping water is pressed against the sampling port 4 by the spring 24 until the target water depth position is reached, preventing the inflow of groundwater into the water storage tank 6. To do. Then, by depressurizing the inside of the water storage tank 6 with the vacuum pump 17 at an intended arbitrary water depth position, the water stopping ball valve 3 opens the sampling port 4 against the force of the spring 24 and collects water.

FIG. 3 shows a modified example of the water storage tank 6 in the case of increasing the water intake amount according to the present invention, and FIG.
Shows a large-diameter water storage tank 19 having a large diameter, and FIG. 3 (B) shows a construction in which an extension water storage tank 20 is connected to the water storage tank 6.

In the present invention, the fixed stopper 1 and the movable stopper 1a which come into contact with groundwater, the ball valve 3 for stopping water,
The conical cylinder 5, the water storage tank 6, and the pipe 10 are made of a metal material such as a stainless steel material that does not affect the measurement accuracy.

[0019]

As described above, according to the present invention, regardless of the skill level of the operator, it is possible to easily sample a deep-drained groundwater sample of a predetermined depth at an arbitrary sampling depth in a short time. There is.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a side view of a main part showing a second embodiment of the present invention.

FIG. 3 is a perspective view showing a modified example of a water storage tank.

FIG. 4 is a perspective view showing a conventional groundwater sampling device.

[Explanation of symbols]

1 Fixed stopper 1a Movable stopper 2 screws 3 Ball valve for water stoppage 4 sampling port 5 conical cylinder 6 water storage tank 9 rope 10 pipes 11 First valve 13 hose 14 Second valve 15 Vacuum tank 17 Vacuum pump 22 Press plate 23 screws 24 springs

Claims (2)

[Claims] 1. A sealed water storage tank having a conical cylinder having a groundwater sample collection port at its tip and a water-stop ball valve for opening and closing the collection port at the tip, and the water storage tank. It has a vacuum tank connected via a long hose, a vacuum pump connected to the vacuum tank via a pipe, a long rope connected to the water storage tank, and a mudguard function attached to the conical cylinder. A groundwater sampling device comprising a stopper and a stopper. 2. The groundwater sampling device according to claim 1, wherein a water ball valve for opening and closing the sampling port is pressed against the sampling port by a spring whose spring pressure is adjusted by adjusting means.