JPH0146677B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a water sampling device used mainly for testing water quality in underground water tanks, and is used to prevent contamination of foreign substances during water sampling and to ensure accurate water quality. The purpose is to enable inspection and simplify water sampling work.

(Prior art) When inspecting the water quality of underground pore water, especially stagnant water existing in a permeable layer due to various circumstances,
Conventionally, the most common method has been to pump up and collect groundwater that has accumulated at the bottom of an excavation hole drilled underground to a predetermined depth using a known simple container or the like. A more advanced method is to use a water sampler with a structure as disclosed in Utility Model Application Publication No. 48-55885, which is successively lowered into the excavated hole to pump up and collect the groundwater that has accumulated at its base. It is also being considered.

(Problems to be Solved by the Invention) However, in any of the above cases, the purpose may not be achieved due to the mixing of intermediate soil or the mixing of interstitial water above the aquifer layer at the planned depth. As it has been impossible to accurately test the water quality of local groundwater in the aquifer layer, the current situation is that water quality tests have been completed based on a rough estimate within a certain allowable range.

However, as is well known, it goes without saying that there is a need and importance of more accurately identifying the quality of groundwater due to the influence of industrial wastewater, etc. In order to conduct accurate water quality testing, it is necessary to sufficiently prevent the contamination of underground components other than the target area.

Furthermore, although it has been theoretically established that it is more complete to sample groundwater from underground, preferably further below the bottom of a borehole excavated using a known bong device, as mentioned above, Known water samplers cannot be used for the above purpose due to their structure.

(Means for Solving the Problem) As a result of various experiments and research carried out over many years, the inventor of the present invention has found that it is possible to reliably sample only the underground water at the target location, and in particular, to collect underground water from further below the bottom of the borehole. Enables water sampling in the middle area,
In addition, we have completed a water sampling device that can be easily disassembled and cleaned after use. Specifically, a ring-shaped body is added to the inner peripheral side of the relatively lower part where the water is sequentially fed into the water retention layer by adding a tubular body. It consists of a casing with a protruding stopper, and a valve body that is loosely fitted into the casing, and the valve body has a flange located above the ring-shaped stopper at its upper end.
In addition, a cone, which is located below the ring-shaped stopper at the lower end and has a sharp tip and protrudes downward from the tip of the casing, is attached in the vertical direction along the inner circumferential surface of the casing. In addition to being slidably provided, the valve body has a water passage hole with one opening on the upper surface side of the flange and the other opening on the side surface closer to the cone, and furthermore, a water passage hole is provided on the upper surface of the flange. The present invention relates to a groundwater sampling device comprising a dish-shaped curved surface formed around the center, and a ball placed on the curved surface.

(Function) In the above-described configuration, the invention of the present application lowers a water sampling device into an excavated hole that has been previously bored to a certain depth using a known boring machine until it reaches the desired depth while adding cylinders one after another. Alternatively, with the cone at the tip in contact with the bottom of the borehole, tap the upper end of the cylinder added above, or tap the flange above the valve body from the inside of the cylinder and remove the cone together with the casing. It is allowed to sink further into the earth from the bottom of the hole until it reaches the desired depth underground. When the water sampling device reaches a predetermined depth, the casing is fixed, and the cone is removed downward from the casing by, for example, hitting the upper surface of the flange from inside the casing. As the cone is removed, the valve body moves toward the opening of the casing, but since the flange contacts the ring-shaped stopper of the casing, it does not move any further.

Groundwater enters the predetermined location from the opened tip of the casing, passes through the water hole of the valve body, and flows into the casing while displacing the ball on the upper surface of the flange. The water that has accumulated inside the casing is collected by pulling up the casing itself. In this case, the ball rolls on the curved surface on the flange and is positioned directly above the water hole due to its own weight,
This prevents the backflow of sampled groundwater.

After use, the cone is removed from the valve body to remove any infiltrated residue and thoroughly cleaned in preparation for next use.

(Example) The specific content of the present invention will be explained below based on an illustrated example. In the figure, A represents the main part of the water sampling device according to the present invention, and 1
Reference numeral 5 indicates a casing, and 5 indicates a valve body having a cone 3 removably attached to its tip.

The casing 1 is made of steel and has a female threaded part 1a on the inner peripheral surface of the upper end, into which the male threaded part of another cylinder (indicated by a chain line) is screwed in order according to the depth of the planned water sampling area. The number of cylinders can be added according to the required length.

Furthermore, a ring-shaped stopper 2 is integrally provided on the inner circumferential surface of the casing 1 near the tip (lower end) so as to protrude in the axial direction over the entire circumferential direction.

The valve body 5 has a large-diameter flange portion 6 whose upper surface is curved into a dish shape to form a curved surface 6a at the upper end, and is perforated along the length direction of the body of the valve body 5, and one side is formed with the above-mentioned shape. A water passage hole 5b is provided at the center of the curvature of the upper surface of the flange portion 6, and the water passage hole 5b is opened at one or more locations facing each other or in the radial direction on the lower side surface of the body of the valve body on the other side. A male threaded portion 5a is formed at the tip (lower end) of the cone 3, and this portion protrudes outward from the ring-shaped stopper 2 through a sealing material 8. 3b is screwed and fixed.

Further, the cone 3 has a sharp tip (lower part), is approximately equal to the inner diameter of the casing 1, and has a sealing groove 3a on its circumferential surface, and the inner circumferential surface of the lower end of the casing 1 is provided in the sealing groove 3a. A sealing material 4 is fitted to the extent that it can come into pressure contact with the casing 1, and is configured to be freely retractable outward from the opening at the tip of the casing 1.

The ring-shaped stopper 2 is located between the flange portion 6 of the valve body 5 and the cone 3, and is configured to have a smaller diameter than the flange portion 6 and the cone 3.

Further, 7 is a ball that rolls on the curved surface 6a on the upper surface of the flange 6, and normally closes the water passage hole 5b by its own weight, and when water is taken from underground, the water pressure rising from the water passage hole 5b The water passage hole 5b is opened by rolling on the curved surface 6a.

However, when in use, the water sampling device A is lowered into a borehole that has been drilled to a certain depth by a known boring means, or with the cone 3 at the tip of the device A in contact with the bottom of the hole. While hitting the upper end of the casing 1 or the upper surface side of the flange portion 6 of the valve body 5, the water sampling device A is lowered into the ground from the bottom of the hole to a certain depth.

At this time, since a sealing material 4 is interposed between the cone 3 and the inner circumferential surface of the casing 1, mixing of intermediate earth and sand in the intermediate layer or mixing of pore water in other parts is prevented.

When the water sampling device A reaches the planned depth in the borehole or underground where water should be sampled, the cone 3 is removed from the casing 1 by tapping the upper surface of the flange 6 of the valve body 5 from inside the casing 1. When the ball 7 is removed from the casing 1, as shown in FIG. 2, underground pore water passes through the water passage hole 5b of the valve body 5 in the direction shown by the arrow, pushes the ball 7 away, and enters the casing 1, where it is accumulated. Ru. In addition, W in the figure indicates the accumulated groundwater. When the casing 1 starts to be pulled up after water sampling is completed, the inside of the casing 1 gradually becomes negative pressure, and when the sampled groundwater W starts to flow backward, the ball 7 closes the water passage hole 5b due to its own weight, preventing the subsequent backflow. It can be completely blocked and pulled upwards to collect water.

(Effects of the Invention) As described above, the present invention provides a casing in which a ring-shaped stopper is protruded from the inner peripheral side of a relatively lower part where tubular bodies are added and sequentially fed into a water reservoir layer, and a ring-shaped stopper is provided inside the casing. the valve body has a flange located above the ring-shaped stopper at its upper end, and a flange located below the ring-shaped stopper at its lower end, and has a sharp tip; A cone is provided in which the cone protrudes downward from the tip of the casing so as to be slidable in the vertical direction along the inner peripheral surface of the casing, and one cone is provided inside the valve body on the upper surface side of the flange. The other side has water holes opened on the side surface closer to the cone, and further, a curved surface curved in a dish shape around the water hole is formed on the upper surface of the flange, and a curved surface is formed on the curved surface. Because it is made by placing a ball on it, it is possible not only to sample water at a predetermined depth within a borehole, but also to sample groundwater at a target location deeper underground than the bottom of the borehole. Moreover, when sampling water, the groundwater in the underground aquifer can be reliably sampled without contaminating other substances, and in particular, the cone, which is useful for sinking into the ground, does not need to be returned to the casing after sampling. Since the water can be drawn up and sampled in that state, it has various beneficial effects such as extremely good workability.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a water sampling device according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a main part of the water sampling device showing its usage state. DESCRIPTION OF SYMBOLS 1... Casing, 2... Ring-shaped stopper, 3... Cone, 4... Seal material, 5... Valve body, 5b... Water hole, 6... Flange, 6a...
Curved surface, 7...Ball, 8...Sealing material.

Claims (1)

[Claims] 1 Consists of a casing with a ring-shaped stopper protruding from the inner circumferential side of the relatively lower part where tubular bodies are added and sequentially fed into the water reservoir layer, and a valve body loosely fitted into the casing. The body has a flange located above the ring-shaped stopper at the upper end, and a flange located below the ring-shaped stopper at the lower end, and has a sharp tip so as to protrude downward from the tip of the casing. cones are respectively provided to be slidable in the vertical direction along the inner circumferential surface of the casing, and one opening is opened in the valve body on the upper surface side of the flange, and the other opening is opened on the side surface closer to the cone. A groundwater sampling device having a water passage hole, further forming a curved surface curved in a dish shape around the water passage hole on the upper surface of the flange, and placing a ball on the curved surface. .