JP3472853B2 - Inspection device for water impermeable sheet and its inspection method. - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to inspection of a defective portion of a water shield sheet.

[0002]

2. Description of the Related Art Conventionally, as a method for inspecting the presence or absence of a defect in a water-impervious sheet joint (conventional method 1), an airtight tape is attached along the longitudinal direction of the joint to form a closed ventilation space, Japanese Patent Laid-Open No. 6-294700 discloses a method of sucking or pressurizing this space and inspecting the presence or absence of a defect by changing the pressure after the suction or pressurization.

Further, as a method (method 2 of the prior art) for inspecting the presence or absence of a defect in the water-blocking sheet, not only the joint portion but also the
A method of detecting the presence or absence of a defect on the sheet surface and, if there is a defect, specifying the location thereof is disclosed in JP-A-7-110280.
It is known from the Japanese Patent Publication. In this method, a predetermined area on the top of the water shield sheet is covered with an airtight sheet, and the periphery of this airtight sheet is brought into close contact with the top surface of the water shield sheet with a solvent or an adhesive agent to seal between the water shield sheet and the airtight sheet. It is a method of forming a space, sucking or pressurizing this space, and inspecting for the presence or absence of a defect by pressure fluctuation after suction or pressurization. In addition, the location of the defect is identified by reducing the predetermined area.

[0004]

The above-mentioned prior art method 1
According to the above, it is possible to inspect whether or not the water-impermeable sheet has a defective joint, but it cannot be inspected at a portion other than the joint portion. The method 2 of the prior art is a method for inspecting parts other than the joint part. However, the conventional method 2 has the following problems.

1) In the method 2 of the prior art, since the airtight sheet and the upper surface of the water-blocking sheet form a closed space, when the large area is to be inspected by suction, the water-blocking sheet is used. The airtight sheet placed for inspection above adhered to the impermeable sheet at an early stage and could not be decompressed to every corner, and even if there was no damage, the pressure gradually increased from the stage when suction was stopped, As a result, there is a problem that it cannot be confirmed that there is no damage.

2) In the method 2 of the prior art, when an inspection is performed by pressurizing the sealed space, if the predetermined area is widened or the applied pressure is increased, the pressure applied to the sealed space is directly blocked. A very strong adhesive force is required to act on the pressure-bonded portion of the water sheet and the airtight sheet to secure a closed space. Therefore, if you want to easily remove the airtight sheet after the inspection, you have to use a special solvent or apply a strong force to the water blocking sheet, and the water blocking sheet will be damaged during this work. There is a problem of fear.

3) When the abnormal portion is to be specified by the suction method according to the method 2 of the prior art, the position can be specified by narrowing the inspection area.
Assuming a measurement area of m × 50 m, an abnormality was found in the first measurement, and in the second measurement, the area was divided into halves, and the third measurement was performed, resulting in an abnormality in the area of 25 m × 50 m. I know there is. Furthermore, 12.5 at the 5th time
Within m × 50m, within the 7th time within 12.5m × 25m, and within the 9th time within 12.5m × 12.5m, for example, it is not a realistic method to specify within 10cm × 10cm. . Further, if there are a plurality of damages, a more complicated inspection must be performed.

4) Further, when the abnormal portion is identified by the above method, the airtight sheet is not damaged, and the pressure change in the hermetically sealed space is largely caused by the improper crimping of the water shield sheet and the airtight sheet. In some cases.

The applicant of the present invention is a method and apparatus for solving the above problem 2) and inspecting the water-proof sheet for damage in a wide area that cannot be inspected by the conventional methods 1 and 2. Geotex filed an application in Japanese Patent Application No. 9-334827 (JP-A No. 11-153509), but since the location of damage cannot be specified, the above 3) and 4)
The problem of is not solved. Further, according to this method, even if the area is widened, the pressure can be reduced to every corner by selecting the deaeration line constituent material. However, even in this case, due to deformation or wrinkles of the water-blocking sheet, or deformation of the material used to secure the sealed space, even if there is no loss in the water-blocking sheet, a pressure change in the sealed space appears and the loss occurs. It is difficult to judge that there is no.

[0010]

According to the present invention, there is provided an apparatus for inspecting a waterproof sheet, comprising: an airtight sheet disposed so as to face at least a part of the waterproof sheet; and between the waterproof sheet and the airtight sheet. A degassing line component that is arranged to prevent the water-impermeable sheet and the airtight sheet from adhering to each other and forms a gas passage,
An airtight material that makes the space between the water-blocking sheet and the airtight sheet airtight so as to form a closed space in which the deaeration line constituent material enters.
A decompression device for removing the gas in the closed space, and the airtight sheet
An atmospheric pressure distribution measuring device for measuring the atmospheric pressure distribution in the enclosed space by means for measuring atmospheric pressure attached to a plurality of places ,
A device for inspecting a waterproof sheet, or an inspection of the waterproof sheet, characterized in that the gas in the closed space is evacuated, the atmospheric pressure distribution in the closed space is measured, and the defective portion of the waterproof sheet is specified from the atmospheric pressure distribution. in the apparatus, a movable sound sensing device
Thus , by detecting the sound of the gas flowing from the defective portion of the waterproof sheet to identify the defective portion, the inspection apparatus for the waterproof sheet or facing at least a part of the waterproof sheet. In the method of inspecting the impermeable sheet for identifying the defective portion of the impermeable sheet using the arranged airtight sheet, the deaeration line component that prevents the impermeable sheet and the airtight sheet from adhering to the impermeable sheet. It is arranged between airtight sheets, and the space surrounded by the air-bleeding line component material between the water-blocking sheet and the airtight sheet is made airtight.
By means of measuring atmospheric pressure installed at multiple points on the
In the method of inspecting a water-impervious sheet, or in the method of inspecting the water-impervious sheet, characterized in that the air pressure distribution in the space is measured, and the defective portion of the water impermeable sheet is specified from the air pressure distribution. Can move the sound of gas flowing from a point
It is a method of inspecting a waterproof sheet, which is characterized by detecting a defective portion by sensing with a sound sensing device .

[0011]

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

<A> Inspection of water-blocking sheet The inspection of the water-blocking sheet 3 specifies the position of the defective portion of the water-blocking sheet 3. For example, the waste disposal site or the regulating pond shown in FIG. With respect to the water-blocking sheet 3 installed on the bottom of the housing structure 1 as described above, the presence or absence of external flaws, joints and other defective portions and their locations are specified. It should be noted that the accommodation structure 1 accommodates the accommodation material 2 such as waste containing water and water.

<B> Water-Impermeable Sheet Inspecting Device The water-impermeable sheet inspecting device includes a deaeration line component 4, an airtight sheet 5, an airtight material 8, a pressure reducing device 7, and an atmospheric pressure distribution measuring device 6. A sound sensing device 10 is provided as needed. When inspecting the water-blocking sheet 3 laid on the bottom of the housing structure 1 as shown in FIGS. 2 to 4, for example, the water-blocking sheet inspection device vents air onto the area A to be inspected of the water-blocking sheet 3. The line component 4 is arranged, and the airtight sheet 5 is further provided thereon.
To lay. An airtight material 8 is provided between the watertight sheet 3 and the airtight sheet 5 around the airtight line structure material 4 so that the airtight sheet 3 and the airtight sheet 5 surround the air removal line component 4. Arranged to form a closed space 9. The closed space 9 is decompressed by the decompression device 7, the atmospheric pressure distribution in the closed space 9 is measured by the atmospheric pressure distribution measuring device 6, and the defective portion 31 shown in FIGS. 3 to 4 is specified.

<C> Airtight Sheet The airtight sheet 5 has airtightness so that gas does not leak, and is arranged so as to face at least a part of the impermeable sheet 3, and forms a closed space 9 together with the impermeable sheet 3. To do.

<D> Degassing line constituent material The degassing line constituent material 4 has a structure that allows gas to pass therethrough, and is arranged in a closed space between the water shield sheet 3 and the airtight sheet 5. Therefore, even if a gas such as air is drawn out from a predetermined portion of the closed space 9, it is possible to prevent the water-blocking sheet 3 and the airtight sheet 5 from coming into contact with each other, and the gas passes through the deaeration line component 4, The closed space 9 can be easily and uniformly decompressed.

In the deaeration line constituent member 4, the gas flows through the material, and the gas-tight sheet 5 and the water shield sheet 3 are in close contact with each other without being crushed by the depressurizing force to interrupt the gas flow. Any material can be used as long as it does not hinder the inspection, for example, a smoke-proof mesh sheet can be used.

<E> Airtight Material The airtight material 8 is for hermetically sealing between the water-blocking sheet 3 and the airtight sheet 5. As the airtight material 8, a regular or irregular sealing material is used. Alternatively, an adhesive or the like may be used as long as it is a material that can ensure the airtightness inside.

<F> Decompression device The decompression device 7 decompresses the inside of the closed space 9 surrounded by the water-blocking sheet 3 and the airtight sheet 5. Pressure reducing device 7
2 to 4, a suction attachment 71 attached to the airtight sheet 5, a suction pipe 72 connected to the suction attachment 71, a suction pipe 7
A decompression meter 75, a shutoff valve 73, and a suction pump 74 connected to No. 2 are provided. By driving the suction pump 74, the gas in the closed space 9 can be extracted from the suction attachment 71 to reduce the pressure in the closed space 9.

<G> Atmospheric Pressure Distribution Measuring Device The atmospheric pressure distribution measuring device 6 measures the pressure distribution in the closed space 9. The atmospheric pressure distribution measuring device 6 is, for example, shown in FIGS.
As shown in FIG. 3, a pressure measuring attachment 61 attached to a plurality of places of the airtight sheet 5 and a barometer 62 connected to the pressure measuring attachment 61 are provided. The pressure distribution of 9 can be measured. Although the airtight sheet 5 is provided with eight barometers 62 in FIG. 3, the present invention is not limited to this, and a plurality of barometers 62 may be provided. Alternatively, the pressure reducer 75 may be omitted and the barometer 62 may be used instead.

The atmospheric pressure distribution measuring device 6 may be any device as long as it can measure atmospheric pressure. For example, as shown in FIG. 4, the pressure sensor 63 attached to a plurality of places of the airtight sheet 5 can be used.
And a pressure sensor 63 equipped with a personal computer 65 electrically connected by a signal line 64, and if there is a defective portion 31, the output values of a plurality of pressure sensors 63 are processed and the pressure distribution is displayed on the isobar 21 or the like. be able to.

<H> Sound Sensing Device The sound sensing device 10 senses the sound of the gas flowing through the defective portion 31 when the impermeable sheet 3 has the defective portion 31. For example, as shown in FIG. 3, a sound generated when gas is sucked from the defective portion 31 into the closed space 9 can be sensed, and an alarm lamp can be turned on to give a notification.

The method of inspecting the water-blocking sheet will be described below.

<A> Formation of closed space When inspecting the water blocking sheet 3 laid on the bottom of the housing structure 1 as shown in FIG. 2, the water blocking sheet 3 should be divided into a plurality of sections to be inspected. The area A of the compartment is covered with the degassing line constituent material 4, and the airtight sheet 5 having a sufficient area is further provided thereon.
To lay. An airtight material 8 capable of maintaining airtightness is provided as a sealing means on the peripheral portion of the airtight sheet 5, whereby a closed space 9 is formed with the deaeration line component 4 sandwiched therebetween. The size of the compartment can be set arbitrarily according to the shape and size of the housing structure, for example, 30 m
Make a square as a side.

<B> A suction attachment 71 is attached to a predetermined position of the depressurized airtight sheet 5 in the closed space, which is located on the degassing line component 4, and a decompression meter serving as a pressure detecting means via a suction pipe 72. 75, a shutoff valve 73, and a suction pump 74 which is a vacuum suction means are connected.

The pressure measuring attachment 61 is arranged for one section as shown in FIG. In the inspection device thus configured, the shutoff valve 73 is opened and the suction pump 7
4 is operated, the gas in the closed space 9 is sucked under reduced pressure through the degassing line constituent member 4.

<C> Specific Defect of Impermeable Sheet When there is a defect in the impermeable sheet 3, the barometer 621 near the defective part 31 does not reduce the pressure as compared with the other barometers 62. As a result, the missing point 31 near the barometer 621
I understand that there is.

At this time, by checking the vicinity of the abnormal barometer with the sound sensing device 10, the sound generated when the gas is sucked from the defective portion 31 is sensed, and the sensing is notified by a lamp or the like, and the water-blocking sheet. The location of the damaged portion 31 of 3 can be found. In addition, after repairing the defective portion 31, the sound sensing device 10
It is possible to easily confirm whether or not the repair has been completed based on the pressure distribution.

When there is no defect, the closed space 9 is depressurized by operating the suction pump 74. This is confirmed by the decompression device 7 and the pressure distribution device 6, and the shutoff valve is closed while the decompression device 7 and the pressure distribution device 6 are depressurized to a predetermined pressure, and the pressure is applied to the decompression device 7 and the pressure distribution device 6. Since the variation does not appear, it can be determined that there is no defective portion in the inspection area of the water blocking sheet 3.

<D> Instead of the specific barometer 62 at the defective portion by the pressure sensor, a pressure sensor 63 for measuring the pressure is attached to the airtight seal 3 as shown in FIG.
Even by analyzing the pressure distribution in 5, the missing point 31
Can be measured.

In this case, even when the shutoff valve 73 is opened and the suction pump 74 is operating, the pressure distribution obtained from each sensor 63 is measured and analyzed,
By displaying the pressure distribution on the personal computer 65, it is possible to leave evidence that there is no defect in the inspection area.

[0031]

According to the present invention, the following effects can be obtained. <A> It is possible to inspect not only the linear joint portion of the water-blocking sheet but also the breakage portion other than the joint portion. <B> Evidence that the impermeable sheet was not damaged and was successfully installed can be left as pressure distribution. <C> When an abnormality is found in the water-blocking sheet of the inspection portion, the abnormal portion can be easily specified, and after the abnormality is repaired, it can be easily confirmed that the abnormal portion has become normal.

[Brief description of drawings]

FIG. 1 is an explanatory view of a housing structure.

FIG. 2 is an explanatory view of an inspection device for a water-blocking sheet.

FIG. 3 is an explanatory diagram of an inspection device in which a plurality of barometers are attached to an airtight sheet.

FIG. 4 is an explanatory view of an inspection device in which a plurality of barometers are attached to an airtight sheet.

[Explanation of symbols]

1 ... Housing structure 2 ... accommodation 21 ... Contour lines 3 ... Water-blocking sheet 31 ... 4 ... Degassing line components 5: Airtight sheet 6 ... Atmospheric pressure distribution measuring device 61 .. Attachment for pressure measurement 611 ・ Attachment for pressure measurement near the defect 62 ... Barometer 621 ・ Barometer near the missing part 63 ... Pressure sensor 64 .. Signal line 65 ... PC 7. Decompression device 71 ... Suction attachment 72 ... Suction piping 73 ... Shut-off valve 74 ... Suction pump 75 ... Decompression gauge 8 ... Airtight material 9 ... Closed space 10 ... Sound sensing device

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshiro Oshikata 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Masaaki Ebihara 1-25-25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Within Taisei Corporation (72) Inventor Eikichi Tomioka 1-25-25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Inside Taisei Corporation (72) Inventor Shiro Amano 1-25-25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Within Taisei Corporation (72) Inventor Shuichi Matsumoto 2-20-5 Nihonbashi Ningyocho, Chuo-ku, Tokyo No. 5 Geotex Co., Ltd. (72) Inventor Yoshiro Ideguchi 2-20 Nihonbashi-Ningyocho, Chuo-ku, Tokyo No. 5 within Geotex Co., Ltd. (56) Reference JP-A-11-153509 (JP, A) JP-A-9-89706 (JP, A) JP-A-9-5202 (JP, A) (58) Survey Field (I nt.Cl. ⁷ , DB name) G01M 3/04 B09B 1/00 ZAB E02B 3/12 G01M 3/24

Claims (2)

(57) [Claims] 1. A water-impermeable sheet inspection apparatus, wherein an air-tight sheet is disposed so as to face at least a part of the water-impermeable sheet, and the water-impermeable sheet is disposed between the water-impermeable sheet and the air-tight sheet. preventing the adhesion of air tightness sheet, the air vent line configuration material constituting the gas passage, so as to form a closed space in which the air vent line configuration material enters, between the water shield sheet and the airtight sheet Airtight material to make the airtight, a decompression device to remove the gas in the closed space, a pressure distribution measuring device to measure the pressure distribution in the closed space by means of measuring the air pressure attached to multiple places of the airtight sheet , movable comprising a sound sensing device such, and remove the gas in the sealed space, the air pressure distribution in the closed space were measured, with the sound sensing device sounds flowing gas from the defect location of water shield sheet in the vicinity of the abnormal pressure of pressure distribution Sense
A water-impermeable sheet inspection device characterized by identifying a defective portion. 2. A water-permeable sheet facing at least a part of the sheet.
Using the airtight sheet that has been placed,
In the method of inspecting a water- permeable sheet for identifying the above, preventing adhesion between the water-permeable sheet and the airtight sheet
Place the degassing line components between the water-blocking sheet and the airtight sheet.
The air-permeable sheet and the air-tight seal,
A plurality of the airtight sheets are made airtight by enclosing the space surrounded by
The atmospheric pressure of the space by means of measuring the atmospheric pressure installed in the place
The distribution is measured, and the defective part of the impermeable sheet near the abnormal atmospheric pressure distribution.
The moving sound detector detects the sound of gas flowing from
Of the impermeable sheet, which is characterized by identifying the defective part
Inspection method.