JPH08178827A - Tester equipment for water permeability and gas permeability - Google Patents

Abstract

PURPOSE: To shorten the time required for switching from measurement of water permeability to measurement of gas permeability by discharging the residual fluid from the channel of a fluid channel forming member and a porous support upon finishing the water permeability test. CONSTITUTION: Upon finishing the measurement of water permeability, compressed air or gas is fed to a line Ld1 at a draining gas introducing section. The gas is fed through a draining gas supply pipe 15 and a blow-out port of a gas blow-out channel 15a into a first porous board member 7. The residual water on the member 7 and a first press tile is drained by the introduced air or gas to the down side where the ventilation resistance is low, then through a connection pipe 12 to the outside of a gas permeable vessel. A fixing block 19 for coupling the connection pipe 12 with ON/OFF valves disposed at the forward ends of lines La1 , La2 is independently provided with a drain line through which the water is drained to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water permeation test apparatus. More specifically, for example, the airtightness of compressed air storage rocks, the leakage prevention of oil and gas storage rocks, the airtightness detection,
The present invention relates to a water permeation / permeation test device used for air permeation evaluation of a pneumatic tunnel in civil engineering construction.

[0002]

2. Description of the Related Art As a radioactive waste disposal facility for stably storing radioactive waste generated in a nuclear business without leaking radioactivity to the outside, for example,
Radioactive waste is enclosed and stored in a groundwater tank having a structure as shown in FIG. In other words, this groundwater tank body 100 is a
Is sequentially covered from the inside with a highly permeable mortar layer 102, a porous concrete layer 103, a concrete skeleton 104, a buffer layer 105, and a bentonite mixed soil layer 106. The groundwater tank body 100 is embedded in a hole formed by hollowing out a bedrock, and a sufficient amount of soil is covered on the upper part. The bentonite mixed soil tank 103 is made by mixing approximately 85% by weight of sand and sand with approximately 15% of bentonite, and is formed by kneading by adding water. By setting the water content to about 14%, the hardness is about the same as gypsum.

As described above, the underground water tank body for enclosing radioactive waste is required to have a certain degree of air permeability because it is necessary to release the gas generated from the radioactive waste to the outside. Since such a groundwater tank body requires strict reliability, it is necessary to accurately grasp its water permeability and air permeability. However, since the bentonite mixed soil tank used for this groundwater tank body is mainly composed of natural products and has a swelling property, it is possible to accurately determine the water vapor permeability in a desktop calculation. It is impossible to calculate, and it is necessary to confirm the self-repairability of water permeability by repeating water permeability and air permeability several times alternately.

Conventionally, the permeability and air permeability of a sample such as soil or rock is measured by sandwiching the sample from above and below with a porous support and placing the sample to be measured in a sealed container (aeration container). The side surface of the measurement sample is surrounded by a non-air-permeable and water-impermeable elastic member such as a rubber membrane, and a predetermined water pressure is applied to this from the outside to block the permeation of air in the lateral direction and to permeate only in the vertical direction. Water or gas is sent from a channel communicating with the bottom surface side of the hermetically sealed container, and water flowing out through a channel communicating with the sample to be measured and communicating with the upper surface side of the hermetically sealed container. Or by measuring the amount of gas. Then, the air permeability coefficient and the water permeability coefficient are obtained from the measured values based on the following equations (1) and (2).

[0005]

[Equation 1]

[0006]

[Equation 2]

FIG. 6 is a cross-sectional view showing the essential structure of an air permeable container in a water permeable air permeability test apparatus that has been conventionally used for measuring the water permeable air permeability coefficient as described above. As shown in the figure, in the air-permeable container main body 50, the measured sample 51
Is placed on the first Pelestyle 54 and the first porous disc-shaped member 53 placed on the air-permeable container body 50, and the side surface thereof is covered with the rubber film 52.
Further, a connecting pipe 55 forming a flow path communicating with a water supply source and a gas supply source (neither is shown) is airtightly inserted through an O-ring in the central portion of the air permeable container body 50. The diameter of the first porous disk-shaped member 53 or the sample to be measured 51, which communicates with the flow path of the connecting pipe 55 at the lower end side and is placed on the upper side at the upper end side. It has a channel having a substantially T-shaped cross-section whose diameter is expanded so that water or gas can be supplied uniformly over the entire direction.

Conventionally, in the case of measuring the water vapor permeability coefficient using such a water vapor permeability test apparatus, first, water is sent from the water supply source into the air permeable container body 50, and the sample 51 to be measured is passed through. After saturating, the water permeability was measured, and in that state, the gas was supplied from the gas supply source within the air permeable container body 50
I sent it to and measured the air permeability.

However, if a water permeability test is carried out by sending water in this way, and a gas permeability test is carried out with the water remaining in the first pellet 54 and the first porous plate-like member 53. , The accurate air permeability test cannot be done. Therefore, the air permeability test is performed after the water remaining in the first pellet style 54 and the first porous disc-shaped member 53 is released. For this reason, it took a long time of several tens of days.

[0010]

DISCLOSURE OF THE INVENTION The present invention provides an improved water permeation / permeation test apparatus in which the measurement time required for measuring the air permeability coefficient from the water permeability coefficient is shortened and the measurement operation is simplified. The purpose is to

[0011]

In order to achieve the above object, the water permeation test apparatus according to the present invention, after measuring the water permeability coefficient by water passage, when sending gas to measure the air permeability coefficient, First, water retained in the first porous disc-shaped member and the first Pellet style (hereinafter referred to as drain water).
Is removed without being sent to the measured sample side, and the gas can be directly sent to the lower surface of the measured sample.

That is, the water permeation test apparatus according to the present invention is provided in a closed container having a water and gas supply system connected to one end and a water and gas measurement system connected to the other end opposite thereto. In a water permeation test apparatus in which a fluid flow path forming member and a porous support are present in front of and behind each other and a sample to be measured is sandwiched, the water and gas supply system is positioned after the water permeation test is completed. A drain discharge mechanism for discharging the fluid remaining in the flow passage of the fluid flow passage forming member and in the porous support body is provided.

It is preferable that the drain discharge mechanism has means for blowing gas into the flow passage of the fluid flow passage forming member located on the water and gas supply system side.

[0014]

As described above, in the water permeation test apparatus of the present invention, the fluid remaining in the channels of the fluid channel forming member located on the side of the water and gas supply system and in the porous support is treated with the water and the gas. Since the drain discharge mechanism that discharges the supply system side is provided, drain water can be discharged to the outside of the system in a short time after the permeability measurement, and it is sent from the water and gas supply system when measuring the permeability coefficient. The incoming gas can be directly supplied to the lower surface of the sample to be measured, and the time required from the permeability coefficient measurement to the air permeability coefficient measurement can be greatly shortened.

[0015]

EXAMPLES The present invention will be described in more detail based on the following examples. FIG. 1 is an apparatus circuit diagram schematically showing the overall configuration of a water permeation test apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the main configuration of the water permeability test apparatus according to the present invention. FIG. 3 is a sectional view taken along line III-III in FIG.

As shown in FIGS. 1 and 2, the water permeation test apparatus of this embodiment is a triaxial water permeation test apparatus for measuring the coefficient of water permeation of soil and rocks. 1. An air-permeable container 2 for storing 1; a water-permeable aeration unit A for allowing water and air to flow through the sample 1 to be measured stored in the air-permeable container 2; A measuring unit B for measuring the amount of water and gas passing through the measured sample 1 and a lateral pressure introducing unit C for applying a predetermined lateral pressure to the side surface of the measured sample 1 housed in the air permeable container 2. And a drain water discharge gas introduction part D for supplying gas for discharging drain water in the air permeable container 2.

The air permeable container 2 has an air permeable container body 3 having an open upper end, and an air permeable container lid 4 for closing the upper end opening of the air permeable container body 2. The joint between the air container body 3 and the lid 4 is fixed by a bolt 5 in order to maintain the airtightness and liquidtightness of the surrounding space. Then, in the air permeable container 2, a first Pellet style 6 having a channel having a substantially T-shaped cross section, a first porous disc-shaped member 7, a sample to be measured 1, a first coaxially with the container body are provided. 2 The porous disk-shaped member 8 and the second Pelestyle 9 that forms a flow path having a substantially inverted T-shaped cross section are sequentially stacked and stored, and the side surfaces of these stacked bodies are covered with a rubber film 10. ing.

Further, the central portion of the bottom surface of the air permeable container body 3
Is the line L of the water passage part A _a1And L_a2In communication with
The connecting pipe 12 forming a flow path for
It is tightly inserted. Flow path of the first Pelestyle 6
Is connected to the flow path of the connecting pipe 12 on the lower end side,
On the upper end side, the first perforation placed on the upper side thereof
Spreads the whole of the plaque member 7 or the sample 1 to be measured in the radial direction.
Funnel so that water or gas can be supplied
The diameter is expanded in a circular shape to have a substantially T-shaped cross section. In addition,
This expanded part does not necessarily have to be tapered,
It may be in the form of a shape. On the other hand, the air-permeable container lid
From the opening provided in the central part of No. 4,
The upper end of the tile 9 projects to the outside,
Airtightness is maintained even by O-rings.

Further, in the air permeable container 2, a water tank of the side pressure introducing portion C is provided in a gap between the laminated body surrounded by the rubber film 10 and the inner peripheral surface of the air permeable container body 3. 11
From the above to the gap through a line L _c1 communicating with the distilled water to fill the sample to be measured with a predetermined lateral pressure, for example, a pressure of about 0.1 to 10.0 kgf / cm ² , and to the lateral direction. The water permeation is blocked so that only the vertical direction can be permeated.

Further, in the air permeable container 2, a drain water discharge gas supply pipe 15 connected to the line L _d1 of the drain water discharge gas introduction portion D is passed through the bottom surface of the air permeable container body 3 to As shown in FIGS. 2 and 3, it communicates with a gas blowing passage 15 a formed in the first Pellet style 6.
The gas outlet passage 15a communicates with the gas supply pipe 15 via the annular groove 16, and the outlet thereof is opened in the middle of the thickness of the first porous disc-shaped member 7.

As shown in FIG. 1, the permeability is measured by
Place the sample to be measured 1 in the air permeable container 2 as shown in
Compressor of the water flow ventilation part A under pressure
Predetermined pressure from 13, for example 0.1 to 10.0 kgf / cm
² Line L with compressed air _a5Through lower air tiger
To the top 14 where it is extruded by compressed air
Distilled water with line L_c2And through the connecting tube 12
It is carried out by feeding it into the container 2. Air-permeable container
The water that has passed through the sample to be measured in
It is guided to the outside of the air permeable container through the flow path of tile 6,
Line of the measuring unit B communicating with the flow path of the second Pelestyle 6
L_b1Is sent to the upper air trap 17. Transparent
When measuring the water coefficient, the upper air trap 17 is not
Water is completely filled, and the same amount of water as the inflow is
In L_b2Spilled through to the sealed burette 18
Sent in. Therefore, measurements in closed burettes
Permeability is calculated from the difference in water level from the start and this value is
The permeability coefficient is obtained by introducing the formula (2).

After the water permeability is measured in this way, the air permeability is then measured. In the test apparatus of the present invention, first, after the water permeability measurement is completed, the drain water discharge gas introducing portion D Compressed air and / or gas is caused to flow in the line L _d1 of the
Through the outlet of the gas blowing passage 15a
It is led out into the porous disc-shaped member 7. Most of the drain water remaining in the first porous disc-shaped member 7 and the first Pellet style is directed to the lower side having a low ventilation resistance by the introduced air or gas, and passes through the connecting pipe 12 to the air permeable container 2
It flows to the outside. A drain line (not shown) is additionally provided in the mounting block 19 for controlling the connection between the connecting pipe 12 and the on-off valves provided at the respective _ends of the lines L _a1 and L _a2 , and drain water is drained through this drain line. It is discharged to the outside of the system. Of course, the drain in the opposite direction is also possible.

When the drain water is discharged out of the system, the above
Compressed air is lined from the compressor 13 in the water vent A
L_a4To the accumulator 20 via the
L _a3Helium gas, hydrogen from the gas cylinder 21 via
A predetermined gas such as gas is caused to flow, and the accumulator 20 is used.
Predetermined pressure, for example 0.1 to 10.0 kgf / cm² degree
The pressure of gas and compressed air to line L_a1and
It is sent into the air permeable container 2 via the connecting pipe 12. Air permeability
In the container 2, compressed air passing through the sample to be measured and
And gas are permeable containers through the second Pelestyle 6 flow path.
It is guided to the outside and communicates with the flow path of this second Pelestyle 6.
Line L of measuring unit B_b1Through the upper air trap
Sent to 17. Compressed air in the upper air trap 17
When gas and gas are introduced, they are stored in the air trap 17.
The amount of water that was stored depends on the inflow of compressed air and gas.
Line L_b2Leaked through and closed burette 1
It is sent to 8. Therefore, keep it in a closed buret
The air permeability is calculated from the water level difference from the start of measurement.
The air permeability coefficient is calculated by introducing the value into the above equation (1).
It

Further, the self-healing property of the sample regarding the water permeability is confirmed by repeating the above-described measurement of the water permeability coefficient and the air permeability coefficient several times alternately. FIG. 4 is a graph showing an example of the results of measuring the water permeability of a bentonite mixed soil tank used for a groundwater tank body of radioactive waste using the water permeability test apparatus according to the present invention as described above. Is.
As shown in the figure, when the water permeation test apparatus according to the present invention is used, it is clear that the time required for such measurement is significantly shortened and the efficiency is high.

The structure of the water permeation test apparatus according to the present invention is not limited to the structure shown in the above-mentioned embodiment, and the drain discharge mechanism may be a fluid flow located on the water and gas supply system side. Any structure may be used as long as it has a configuration in which drain water remaining in the flow passage of the passage forming member and in the porous support is discharged to the water and gas supply system side.

[0026]

As described above, by using the water permeation test apparatus of the present invention, in measuring the water permeation coefficient of a sample such as soil and rock, it is necessary to measure from the water permeability coefficient to the air permeability coefficient. The measurement time can be shortened and the measurement operation can be simplified.

[Brief description of drawings]

FIG. 1 is an apparatus configuration diagram schematically showing an overall configuration of a water permeation test apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main configuration of a water permeation test apparatus of the same example.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a graph showing changes in water permeability measured using the water permeability test apparatus according to the present invention.

FIG. 5 is a cross-sectional view showing the structure of a groundwater tank body for storing radioactive waste.

FIG. 6 is a cross-sectional view showing a main part configuration of an example of a conventional water permeation test apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sample to be measured 2 ... Air-permeable container 3 ... Air-permeable container main body 4 ... Air-permeable container lid 6 ... 1st Pelestyle 7 ... 1st porous disk-shaped member 8 ... 2nd porous disk-shaped member 9 ... 2nd Pelestyle 10 ... Rubber film 11 ... Water tank 12 ... Connection pipe 13 ... Compressor 14 ... Lower air trap 15 ... Drain water discharge gas supply pipe 15a ... Gas outlet passage 16 ... Annular groove 17 ... Upper air trap 18 ... Closed burette 20 ... Accumulator 21 ... Gas cylinder 100 ... Groundwater tank 103 ... Bentonite mixed soil tank

Claims (2)

[Claims] 1. A fluid flow path forming member and a porous support in a closed container having a water and gas supply system connected to one end thereof and a water and gas measurement system connected to the other end opposite thereto. In the water permeation air permeability test apparatus in which the sample to be measured is sandwiched between the front and the back, respectively, after the water permeation test is completed, the inside of the flow channel of the fluid flow channel forming member located on the water and gas supply system side and the porous A water permeation / permeation test device comprising a drain discharge mechanism for discharging fluid remaining in the quality support. 2. The water permeation / permeation test apparatus according to claim 1, wherein the drain discharge mechanism has means for blowing gas into the flow passage of the fluid flow passage forming member located on the water and gas supply system side.