JP3000458B1 - Groundwater sampling equipment - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To ensure smoothness when a lid falls along a cable to close an upper opening of a tubular main body, and to differ from a gap between the lid and the cable when lifting after water sampling. It is possible to prevent groundwater at a depth from penetrating into the cylindrical main body, which is a water sampling pipe, and to perform accurate sampling. A cover (5) attached to an upper opening (4b) of the tubular body (4) is provided on a cable (2) such as a wire attached to an upper open tubular body (4) having a bottom cover (3). In a groundwater sampling apparatus slidably mounted via a guide hole 13, a water-stopping material 11 having water-absorbing and swelling properties is attached to the main body 9 of the lid 5, and the cable 2 is inserted through the water-stopping material 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groundwater sampling device.

[0002]

2. Description of the Related Art Groundwater is collected to investigate the quality of groundwater, including the use of groundwater as a resource and the nature of the ground during construction work, including environmental studies such as polluted soil and groundwater surveys. ing.

There are various types of devices for collecting groundwater. One example of a device for collecting water at a predetermined position in water is Japanese Patent Application No. 10-32962 previously proposed by the applicant. This is, as also shown in FIG.
It comprises a bottom cover 3 fitted to the bottom opening 4a of the tubular body 4 and attached to a cable 2 such as a wire, and a cover 21 fitted to the upper opening 4b of the tubular body 4.

The lid 21 is formed in the shape of a cap having a U-shaped cross section, the inner diameter is formed equal to the outer diameter of the cylindrical main body 4, and a guide hole 21a through which the cable 2 is inserted is provided at the center.

[0005] Then, in order to collect groundwater, a cable 2 having a bottom cover 3 attached to a tip thereof is provided in a borehole for water collection.
Is dropped, lowered to a predetermined water sampling position, and positioned here. Next, the tubular main body 4 serving as a water sampling pipe is sunk into the underground water layer in the boring hole using the rope 2 as a guide while the rope 2 is inserted therein, and the bottom lid 3 is located. It is lowered to a predetermined depth, and the bottom cover 3 is fitted into the bottom opening 4a.

In this state, the inside of the cylindrical main body 4 is filled with groundwater at a predetermined position in the groundwater layer. Therefore, the lid 21 in which the cable 2 is inserted into the guide hole 21a is submerged in the groundwater layer, and the upper opening 4b of the cylindrical main body 4 is closed with the upper lid 21.
Groundwater is sealed inside the cylindrical main body 4. When the groundwater is sealed in the inside of the tubular main body 4 in this way, the cable 2 is pulled up from the boring hole.

As a result, the cable 2, the bottom cover 3, the tubular main body 4 formed by the water collecting pipe, and the lid 21 are pulled up together to collect water.

[0008]

In order to cover the upper opening 4b of the cylindrical body 4 by lowering the lid 21 by its own weight, the lid 21 is
It is necessary to slide smoothly without resistance along
For this purpose, the inner diameter of the guide hole 21a through which the rope 2 is inserted is formed to be slightly larger than the outer diameter of the rope 2. For this reason,
When a gap is formed between the lid 21 and the cable 2, groundwater infiltrates into the cylindrical main body 4 from this gap at the time of lifting, and groundwater at a depth different from the depth at which water is collected enters the cylindrical main body 4. Therefore, it was difficult to perform strict sampling.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the disadvantages of the prior art and to ensure the smoothness of the lid falling along the cable so as to close the upper opening of the cylindrical body, and at the time of lifting after water sampling. An object of the present invention is to provide a groundwater sampling device that can prevent groundwater of different depths from entering into a cylindrical main body that is a water sampling pipe from a gap between a lid and a cable, and can perform accurate sampling.

[0010]

In order to achieve the above object, the present invention firstly attaches a cable such as a wire attached to an open-topped cylindrical body provided with a bottom lid to the upper part of the cylindrical body. In a groundwater sampling apparatus in which a lid attached to an opening is slidably attached via a guide hole provided in the lid, a water-stopping material having a water-absorbing swelling property is attached to a main body of the lid, and the water-stopping material is attached to the water-stopping material. The gist is to insert a cable.

Secondly, the gist of the present invention is that the lid body has a restraining member that regulates the water-absorbing material having a water-absorbing swelling property so as to swell in the direction of the cord and the inner wall of the tubular body.

Third, the water-absorbing material having a water-absorbing and swelling property is formed substantially in a ring shape in a plane, provided with slits at appropriate places, and detachably attached to the lid body through the slits. Is what you do.

Fourthly, the gist of the present invention is that the tip of the lid body is formed in a conical shape.

Fifth, the gist of the present invention is to interpose an elastic member such as rubber, which is in close contact with the cord and the inner wall of the tubular main body, between the water-stopping material having a water-absorbing swelling property and the restraining member. .

Sixth, the elastic member has a fin-shaped protruding piece on the peripheral surface.

Seventh, the water-stop material having a water-absorbing swelling property is buried in the restraining member so as to swell in the direction of the cable, and a spiral groove is provided on the outer peripheral surface of the restraining member so as to fit with the cylindrical main body. The gist of the invention is that a spiral groove that fits into the spiral groove is provided on the inner wall of the cylindrical main body.

Eighth, the water-stop material having a water-absorbing swelling property is embedded in the restraining member so as to swell in the direction of the cable, and a spiral groove is provided on the outer peripheral surface of the restraining member so as to be fitted with the cylindrical main body. In addition, a spiral groove that fits into the spiral groove is provided on the inner wall of the cylindrical main body, and a rotating blade is provided on an upper portion of the lid main body.

According to the first aspect of the present invention, when the bottom lid and the tubular main body are lowered to a predetermined depth in the groundwater layer and then the lid is lowered along the cable, Since there is a gap between them, the lid smoothly descends along the cable.
And, when the lid is fitted to the upper opening of the cylindrical body,
The water-absorbing swelling material provided on the lid swells due to water absorption, and closes the gap between the lid and the cord. Therefore, when the tubular body with the lid is pulled up together with the cable after water sampling, the gap between the lid and the cable is closed and the water is stopped. Does not penetrate into the cylindrical body via the lid, and the sampling accuracy is improved.

According to the second aspect of the present invention, in addition to the above function, when the water-absorbing swelling water-swelling material swells due to water absorption, the direction of swelling is determined by the restraining member provided on the lid body. Since it is regulated in the direction of the strip and the inner wall of the tubular body, the gap between the cord and the lid body and the gap between the lid body and the inner wall of the tubular body are reliably closed.

According to the third aspect of the present invention, in addition to the above-mentioned functions, the water-stopping material having water-absorbing and swelling properties is formed in a substantially ring-like shape in a plane, and slits are provided at appropriate places, and the slits are inserted through the slits. Since it is detachably attached to the lid body, it can be easily replaced when it has deteriorated, and can be attached to, for example, an existing lid body.

According to the fourth aspect of the present invention, in addition to the above-described operation, the tip of the lid body is formed in a conical shape, so that when the lid is dropped and mounted on the upper opening of the cylindrical body, the tip is formed. Not only does it serve as a guide, it also reduces the resistance when falling in water and uses the falling speed to smoothly enter the cylindrical body.

According to the fifth aspect of the present invention, in addition to the above-mentioned function, an elastic member such as rubber is interposed between the water-stopping material having water-absorbing swelling and the restraining member. This elastic member as well as the water-stopping material that is provided adheres tightly to the cable and the inner wall of the tubular main body, so that the water can be stopped more reliably.

According to the sixth aspect of the present invention, in addition to the above-described operation, the fin-shaped protrusion provided on the peripheral surface of the elastic member is in close contact with the cable and the inner wall surface of the tubular main body. Not only can the water-stopping material having water-absorbing properties exhibit the water-stopping function by absorbing water, but also can have a double water-stopping structure so that the water-stopping can be made more reliable. This can be compensated for when the function of the material is not sufficiently exhibited.

According to the seventh aspect of the present invention, water can be stopped by closing the gap between the cord and the lid with a water-absorbing and swelling water-stopping material in the same manner as described above. Water stoppage between the outer peripheral surface and the inner wall surface of the cylindrical main body can be achieved by fitting spiral grooves formed respectively on the outer peripheral surface of the restraining member and the inner wall surface of the cylindrical main body.

According to the present invention described in claim 8, according to claim 7,
In addition to the operation of the present invention described above, the rotation of the lid is promoted by the rotation of the rotary wing provided on the upper portion of the lid main body, whereby the screwing between the lid main body and the cylindrical main body can be further ensured. .

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional front view showing a first embodiment of a groundwater sampling apparatus according to the present invention, and the same components as those of the conventional example shown in FIG. The groundwater sampling device of the present invention has the same basic configuration as the conventional one.
A cylindrical main body 4 serving as a water sampling pipe, and a bottom opening 4 of the cylindrical main body 4
a, a lid 5 attached to the upper opening 4b of the tubular body 4, and a cable 2 such as a wire that connects the bottom lid 3, the tubular body 4 and the lid 5 to each other.

As shown in FIG. 1, for example, the cylindrical main body 4 is a cylindrical body made of a material having a specific gravity greater than that of water such as stainless steel, and the inner edges of the bottom opening 4a and the top opening 4b are enlarged in diameter toward the outside. Formed on the tapered surface 6.

As the bottom cover 3, as shown in FIG. 1, for example, a plate-shaped main body 3a is formed of a material such as stainless steel or the like having a specific gravity larger than that of water, and an elastic member 3b such as synthetic rubber is combined on the upper part. The inner diameter of the elastic member 3b was formed to be equal to the inner diameter of the bottom opening 4b of the cylindrical main body 4, and a tapered surface 7 was formed which matched the tapered surface 6 formed in the bottom opening 4a. Then, one end of the cable 2 such as a wire is fixed to the bottom surface of the bottom cover 3 with a clasp.

As shown in FIG. 4, the lid 5 has a cylindrical shape having a conical lower end, and a main body 9 is formed by a conical portion 9a at the tip and a disk-shaped portion 9b at the upper end. 9 was made of a material such as stainless steel having a specific gravity greater than that of water.

Between the conical portion 9a and the disc-shaped portion 9b,
Upper elastic member 10a having a water stopping function made of synthetic rubber or the like
A substantially ring-shaped water-stopping material 11 having a water-absorbing swelling property is provided with the lower elastic member 10b interposed therebetween. As a result, the lid 5 has a disc-shaped portion 9b, an upper elastic member 10a, a water blocking material 11,
A lower elastic member 10b and a conical portion 9a are combined in this order to form a laminated body, and each member is a fixed screw 12 inserted vertically.
Is connected and fixed. Then, the conical portion 9a and the disc-shaped portion 9
The main body 9 formed by the member b serves as a restraining member that sandwiches the water-stopping material 10 from above and below and regulates the direction of swelling.

The outer diameter of the disc-shaped portion 9b located at the upper portion is formed substantially equal to the inner diameter of the opening edge of the upper opening 4b of the cylindrical main body 4, and the outer diameter of the lower elastic member 10a at the lower stage is equal to the upper opening 4a.
The outer diameter of the lower water-stopping material 11 and the lower elastic member 10b is slightly smaller than the inner diameter of the cylindrical main body 4 so that it can be smoothly inserted into the cylindrical main body 4. did.

The cover 5 has a guide hole through which the cable 2 is inserted.
13 is continuously drilled in each member at the center position. Thereby, the lid 5 is slidably attached along the cable 2.
The shape of the guide hole 13 is formed larger than the thickness of the cable 2 so that the lid 5 can slide smoothly.

The material of the water-stopping material 10 is, for example, a composition containing a rubber substance and a water-swellable resin, a filler, a vulcanizing agent, a vulcanization accelerator, a plasticizer, a coloring agent, an antiaging agent, and a processing aid. The product is kneaded with a machine such as a roll mixer, a Banbury mixer or a kneader, extruded into a desired shape by extrusion molding, and vulcanized by a conventional method. The water-stopping material 11 is provided with a slit at an appropriate place, and is detachably attached to the lid body through the slit.

Next, a method of collecting groundwater using the water sampling apparatus will be described with reference to FIGS. First,
The cable 2 with the bottom cover 3 attached to the tip thereof is hung down into a borehole for water sampling, and the bottom cover 3 is lowered to a water sampling position at a predetermined depth and is positioned there.

Next, the cylindrical main body 4, which is a water sampling pipe having the cable 2 inserted therein, is settled in the groundwater layer in the borehole. At the time of sinking, the cylindrical main body 4 is made of a material having a specific gravity larger than that of water such as stainless steel, so that it sinks easily by its own weight. Then, since the cable 2 descends using the cable 2 as a guide, it descends along the cable 2 to the position of the bottom cover 3 provided at the lower end of the cable 2, and the bottom cover 3 is attached to the bottom opening 4 a of the tubular main body 4. .

At this time, since the elastic member 3b of the bottom cover 3 is fitted into the bottom opening 4a, the tapered surfaces 6 and 7 of the bottom cover 3 and the bottom cover 3 are smoothly inserted into the bottom opening 4a. The elastic member 3b makes close contact with the elastic member 3b and closes the bottom opening 4a in a watertight manner.

In this state, the inside of the cylindrical body 4 is filled with groundwater at a predetermined depth position which has already been collected when the cylindrical body 4 is lowered to a predetermined depth position in the groundwater layer.

Next, as shown in FIG.
The cover 5 is inserted into the underground water layer using the guide hole 13 and the cable 2 as a guide, and inserted into the upper opening 4b of the tubular main body 4 to close it. At this time, since the main body 9 of the lid 5 is made of stainless steel, it descends by its own weight, and the tip is formed in a conical portion 9a. Since there is a gap between them, it is easy to insert it into the upper opening 4b of the tubular main body 4 by utilizing the falling speed with little resistance so as to bite into the upper opening 4b.

Further, the outer peripheral surface of the upper elastic member 10a is aligned with the tapered surface 6 of the upper opening 4b and is brought into close contact therewith.

In this state, the water-stopping material arranged in the intermediate layer
11 absorbs water and swells. At this time, the swelling direction of the water-stopping material 11 is restricted by the conical portions 9a and the disc-shaped portions 9b, which are upper and lower positions, which are restraining members, and as shown in FIGS. At the same time, the waterproof material 11 swells. As a result, the water blocking material 11 is integrated with the cable 2, the guide hole 13 is closed, the gap between the cable 2 and the cover 5 is eliminated, and the cover 5 is closed.
The gap between the cylindrical body 4 and the inner wall of the cylindrical body 4 is also closed, and the water of the cylindrical body 4 can be stopped at the location of the lid 5.

When the water-stopping material 11 swells and stops as described above, the cable 2 is pulled up, and the tubular main body 4 attached thereto is collected together with the bottom cover 3 and the cover 5 on the ground. At the time of lifting, the guide hole 13 is closed by the water blocking material 11, so that groundwater of different water quality of different groundwater layers does not enter the inside of the tubular main body 4 from here.

In order to detect that the water-stopping material 11 has swelled and the water-stopping has been completed, a water-absorbing time is measured by performing a test to absorb and expand the water-stopping material 11 before water is taken out. Check that this time has elapsed, or
When the lid 5 with the attached 11 is lowered into the water, at the same time another lid 5 of the same form is submerged in a container filled with water on the ground to observe the state of expansion of the waterproof material 11, and For example, such means as confirming the completion of water stoppage is adopted as appropriate.

The lid 5 is removed from the cylindrical body 4 collected on the ground, and the collected groundwater is transferred to another container.

FIGS. 6 and 7 show a second embodiment. In addition to the structure of the first embodiment, the lower elastic member 10 having a substantially ring-like planar shape is used.
b, projecting fin-shaped projections 16 on the inner and outer peripheral surfaces, respectively, and sliding the projections 16 on the inner wall surface of the rope 2 and the cylindrical main body 4, respectively. And the gap between the lid 5 and the inner wall surface of the cylindrical main body 4 is closed by the protruding piece 16. Therefore, as shown in FIG. 7, when the water-stopping material 11 expands, the water-stopping material 11 blocks the water-stopping material 11 and the water-stopping material 11 can be more reliably stopped.

When the lid 5 is dropped into the inside of the tubular body 4, the projecting piece 16 comes into sliding contact with the cable 2 or the inner wall surface of the tubular body 4, but the projecting piece 16 reduces the elasticity. Since it is provided, the projecting piece 16 does not prevent the lid 5 from lowering.

FIGS. 8 and 9 show a third embodiment. The basic structure of the lid 5 is the same as that of the first embodiment.
a and a disc-shaped portion 9b at the upper end constitute a main body 9, and a disc-shaped elastic member 10 having a water-stopping function made of synthetic rubber or the like is interposed between the conical portion 9a and the conical portion 9a, The main body 9 and the elastic member 10 were connected and fixed by fixing screws 12 inserted vertically, and a guide hole 13 was formed at the center position, and the cable 2 was inserted therethrough.

Then, a recess is provided at the center of the conical portion 9a at the tip, and the water-stopping material 11 is embedded in the recess. Therefore,
The conical portion 9a serves as a restraining member that regulates the expansion direction of the water-stopping material 11, and the cable 2 penetrates through the center of the water-stopping material 11.

The cylindrical main body 4 is provided on the outer peripheral surface of the conical portion 9a.
And a spiral groove 15 that fits into the spiral groove 14 is provided on the inner wall of the cylindrical main body 4, and a rotating blade 17 that rotates in the horizontal direction is provided above the main body 9 of the lid 5. Was provided.

Therefore, the lid 5 is connected to the upper opening 4b of the cylindrical main body 4.
When the cover 5 is moved downward, the spiral groove 14 formed on the outer peripheral surface of the conical portion 9a is screwed with the spiral groove 15 formed on the inner wall of the cylindrical body 4 so that the lid 5 is And watertight between the lid 5 and the cylindrical main body 4 can be achieved. In this case, since the lowering of the lid 5 is performed while the spiral groove 14 is screwed with the spiral groove 15, the directionality is reliable, and the rotating blade
When 17 is provided, the rotation of the lid 5 is promoted by the rotation of the rotary wing 17, and the screwing of the spiral groove 14 with the spiral groove 15 is further ensured.

Further, the water-stopping material 11 swells in the direction of the cable 2 to close the gap between the cable 2 and the gap between the lid 5 and the cable 2 to stop water.

[0051]

As described above, in the underground water sampling apparatus of the present invention, a gap is provided between the lid and the cord or between the lid and the tubular body to cover the upper opening of the tubular body. When the lid closes the upper opening of the tubular body and pulls up after water is collected, the gap between the lid and the rope or between the tubular body while ensuring smoothness when falling along the cable The gap can be closed with a water-swellable water-stopping material, and groundwater at different depths can be prevented from penetrating into the cylindrical body that is a water sampling pipe from the gap, and accurate sampling can be performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a groundwater sampling apparatus according to a first embodiment of the present invention before a lid is put therein.

FIG. 2 is a longitudinal sectional front view of a groundwater sampling apparatus according to a first embodiment of the present invention in a state where a lid is inserted.

FIG. 3 is a vertical cross-sectional front view of the first embodiment of the groundwater sampling apparatus of the present invention in a state in which the cylindrical main body is closed by a lid.

FIG. 4 is a vertical sectional front view showing a stage before water swelling of a lid which is a main part of the first embodiment of the groundwater sampling apparatus of the present invention.

FIG. 5 is a vertical sectional front view of a stage after water swelling of a lid which is a main part of the groundwater sampling apparatus of the first embodiment of the present invention.

FIG. 6 is a longitudinal sectional front view of a stage before water swelling of a lid, which is a main part of a second embodiment of the groundwater sampling device of the present invention.

FIG. 7 is a longitudinal sectional front view of a stage after water swelling of a lid, which is a main part of a groundwater sampling apparatus according to a second embodiment of the present invention.

FIG. 8 is a longitudinal sectional front view showing a stage before water swelling of a lid, which is a main part of a third embodiment of the groundwater sampling apparatus of the present invention.

FIG. 9 is a longitudinal sectional front view of a stage after water swelling of a lid, which is a main part of a third embodiment of the groundwater sampling apparatus of the present invention.

FIG. 10 is a vertical sectional front view showing a conventional groundwater sampling apparatus.

[Explanation of symbols]

 2 ... cord 3 ... bottom lid 3a ... body 3b ... elastic member 4 ... cylindrical body 4a ... bottom opening 4b ... top opening 5 ... lid 6 ... taper surface 7 ... taper surface 8 ... clasp 9 ... body 9a ... disk shape Part 9b ... Conical part 10 ... Elastic member 10a ... Upper elastic member 10b ... Lower elastic member 11 ... Water stop material 12 ... Fixing screw 13 ... Guide hole 14, 15 ... Helix groove 16 ... Protrusion piece 17 ... Rotating blade 21 ... Lid 21a… Guide hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 1/06 G01N 1/12 E21B 49/08-49/10

Claims (8)

(57) [Claims] 1. A cover attached to an upper opening of a tubular body, which slides on a cable such as a wire attached to a tubular body having an open top provided with a bottom cover, through a guide hole provided in the cover. A groundwater sampling device, which is freely attached, wherein a waterstop having swelling properties is attached to a main body of the lid, and the cable is inserted through the waterstop. 2. The underground water sampling apparatus according to claim 1, wherein the lid main body has a restraining member that regulates the water-blocking material having water-absorbing swelling properties so as to swell in the direction of the cord and the inner wall of the tubular main body. 3. The water-blocking material having a water-absorbing and swelling property is formed in a substantially ring shape in a plane, a slit is provided at an appropriate position, and the water-stopping material is detachably attached to the lid body through the slit. 3. The underground water sampling apparatus according to 2. 4. The groundwater sampling device according to claim 1, wherein the lid body has a conical tip. 5. An elastic member such as rubber, which is in close contact with the cable and the inner wall of the tubular body, is interposed between the water-stopping material having a water-absorbing swelling property and the restraining member. The underground water sampling device according to 1. 6. The underground water sampling device according to claim 5, wherein the elastic member has a fin-shaped protrusion on the peripheral surface. 7. A water-stop material having a water-absorbing swelling property is buried in a restraining member so as to swell in a direction of a cable, and a spiral groove is provided on an outer peripheral surface of the restraining member so as to fit with a cylindrical main body.
The groundwater sampling apparatus according to any one of claims 1, 3, 4, and 5, wherein a spiral groove that fits into the spiral groove is provided on an inner wall of the cylindrical main body. 8. A water-blocking material having a water-absorbing swelling property is embedded in the restraining member so as to swell in the direction of the cable, and a spiral groove is provided on the outer peripheral surface of the restraining member so as to fit with the cylindrical main body.
The spiral groove fitted to the spiral groove is provided on the inner wall of the cylindrical main body, and the rotating blade is provided on an upper portion of the lid main body. Groundwater sampling equipment