JP7092739B2 - Tarpaulin seam inspection system - Google Patents

Description

The present invention relates to a system and a method for inspecting the quality of a seam of a waterproof sheet, and in particular, a system for inspecting the quality of the sealing property (liquidtightness, airtightness) of a seam in which adjacent waterproof sheets are joined by welding or the like. And methods.

For example, in a mountain tunnel such as a NATM (New Austrian Tunneling Method) tunnel, a waterproof sheet such as an EVA sheet is attached between the primary lining such as sprayed concrete and the secondary lining (see Patent Document 1 and the like). ). The tarpaulin prevents spring water from the ground from flowing into the secondary lining concrete and thus into the tunnel interior space.

The waterproof sheet has a width of several meters, and the width direction is directed toward the tunnel axis, and the waterproof sheet is stretched in the circumferential direction of the arch portion of the tunnel. A plurality of waterproof sheets are arranged in the direction of the tunnel axis, and the ends of adjacent waterproof sheets are welded to each other to form a seam of these waterproof sheets. If there is a poor welding here, water may leak from the seam, so a seam inspection is performed.

Japanese Unexamined Patent Publication No. 2016-113801

Generally, the seam inspection is performed by a pressure test. Specifically, a closed space is defined in the seam by the welded portion, and a test pressure by compressed air is introduced into the closed space. If the welding is good, the internal pressure of the closed space is almost maintained at the test pressure at the time of introducing compressed air. If there is poor welding, air leaks from it, and the internal pressure of the closed space drops. Therefore, the quality of the seam can be determined by measuring the internal pressure of the closed space with the pressure detector. Usually, the pressure detector is an analog gauge.

However, since the analog gauge is visually confirmed and the pressure value is read, erroneous judgment is likely to occur. It is easy to make mistakes when recording test results in a notebook or inputting to a personal computer. It is also practiced to take a picture of the site of the inspection and use it as evidence of the inspection, but the accuracy of the inspection is not guaranteed. Further, the change with time of the detected pressure is read only about once per minute, for example, and has not been analyzed in detail.
In view of such circumstances, it is an object of the present invention to improve the accuracy of the seam inspection of the waterproof sheet, increase the number of acquired data, and enable detailed analysis.

In order to solve the above problems, the present invention is a system for inspecting the quality of the seam of the waterproof sheet.
An inspection path that introduces test pressure into the closed space defined in the seam,
A pressure detector that detects the internal pressure of the closed space via the inspection path and outputs it as an electrical signal.
A signal converter that converts the electrical signal into a digital signal and outputs it.
It is characterized by being equipped with a mobile terminal that receives the digital signal and generates pass / fail inspection information.

According to this system, the internal pressure value of the closed space is input to a mobile terminal of an inspection worker or the like, and the quality inspection information including the quality determination of the seam is generated in the mobile terminal. Therefore, the accuracy of the inspection is guaranteed without human reading error or recording error.
Furthermore, the number of acquired data for changes in the internal pressure of the closed space can be significantly increased compared to reading the analog gauge with the human eye, and detailed analysis can be performed. For example, if the internal pressure drops sharply, it can be inferred that there are large welding defects.

It is preferable that the pressure detector and the signal converter are housed in a waterproof housing.
This can prevent the pressure detector and the signal converter from getting wet with water and failing.

Further, the method of the present invention is a method of inspecting the quality of the seam of the waterproof sheet.
The process of introducing the test pressure into the closed space defined in the seam, and
The process of detecting the internal pressure of the closed space with a pressure detector and outputting it as an electrical signal,
The process of converting the electric signal into a digital signal by a signal converter and outputting it.
It is characterized by including a process of receiving the digital signal by a mobile terminal and generating pass / fail inspection information.
The quality inspection information includes the digital signal, the accumulated information of the internal pressure detection value of the closed space, the judgment information of good or bad, the time-dependent change data of the internal pressure, the judgment result, and the like, and the seam inspection report and other forms. Can be mentioned.
"Generating good / bad inspection information" includes accumulating reception data of the digital signal and thus the internal pressure detection value, obtaining judgment information on whether it is good or bad, creating and displaying the form, and the like. ..

According to the present invention, the accuracy of the seam inspection of the waterproof sheet can be improved, and the number of acquired data can be further increased to perform detailed analysis.

FIG. 1 is an explanatory diagram showing a state in which a seam inspection of a waterproof sheet for a tunnel is performed by the seam inspection system according to the embodiment of the present invention. FIG. 2 is a block diagram of the seam inspection system. FIG. 3 is a front view showing an example of a form created by the seam inspection system.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the waterproof sheet to be inspected in this embodiment is the waterproof sheet 2 of the NATM tunnel 1. The waterproof sheet 2 is stretched on the inner surface (lower surface in FIG. 1) of the sprayed concrete 3 facing the inside of the tunnel. The waterproof sheet 2 has a laminated structure of a water-permeable sheet 4 made of EVA resin or the like and a water-permeable sheet 5 made of a non-woven fabric or the like. The permeable sheet 5 faces the sprayed concrete 3. The impermeable sheet 4 faces a secondary lining (not shown). The secondary lining is constructed inside the tunnel of the waterproof sheet 2 (lower side in FIG. 1). The impermeable sheet 4 prevents the spring water from the ground 8 from flowing into the secondary lining and thus the space inside the tunnel. The spring water is discharged through the inside of the permeable sheet 5.

One waterproof sheet 2 has a width of several meters, and the width direction is directed to the tunnel axial direction (left and right in FIG. 1), and the circumferential direction of the arch portion of the tunnel 1 (intersects the paper surface in FIG. 1). It is stretched along the direction of the tunnel. A plurality of waterproof sheets 2 are arranged in the tunnel axial direction (left-right direction in FIG. 1). The ends of the impermeable sheets 4 of the two adjacent waterproof sheets 2 are joined to each other by praying and welding to form a seam 6 (sheet connecting portion).

At least two welded portions 6a and 6b are formed in the seam 6. The welded portion 6a is arranged in the vicinity of the edge 4e of the impermeable sheet 4. The welded portion 6b is arranged farther from the edge 4e than the welded portion 6a. The welded portions 6a and 6b extend linearly without interruption over the entire length of the waterproof sheet 2 in the longitudinal direction (direction orthogonal to the paper surface in FIG. 1). The ends of the two impermeable sheets 4 welded by the welded portions 6a and 6b are tilted toward one of the impermeable sheets 4 (on the right side in FIG. 1), and the welded portion 7 causes the one impermeable sheet. It is joined to 4.

As shown in FIG. 1, after the seam 6 is formed, the seam inspection system 9 inspects the quality of the seam 6. The seam inspection system 9 includes an inspection path 10, an inspection unit 20, and a mobile terminal 30.

The inspection path 10 is composed of a gas tube or the like. An air compressor 11 (test pressure source) is connected to the upstream end of the inspection path 10. A hollow pressure detection needle 12 is provided at the downstream end of the inspection path 10. A pressure adjusting valve 13, an on / off valve 14, and a pressure detecting branch portion 15 are sequentially provided in the middle portion of the inspection path 10 from the upstream side. The secondary pressure of the pressure adjusting valve 13 is adjusted to a predetermined test pressure. The magnitude of the test pressure is set according to the type, material, thickness, etc. of the waterproof sheet, and is, for example, more than 1 atm and several atm or less.
The pressure detection path 16 is branched from the pressure detection branch portion 15. The inspection unit 20 is connected to the pressure detection path 16.

The inspection unit 20 has a waterproof housing 21, a pressure detector 22, and a signal converter 23. The waterproof housing 21 is made of a water-impermeable material such as resin, and has a waterproof structure so that water does not enter the inside. The pressure detection path 16 is inserted inside the waterproof housing 21 through the port 21 of the waterproof housing 21. The inner peripheral surface of the port 21c and the outer peripheral surface of the tube constituting the pressure detection path 16 are hermetically sealed with a sealing material (not shown) such as an O-ring or packing.

As shown in FIG. 1, the waterproof housing 21 includes a pressure detector 22 and a signal converter 23. In the waterproof housing 21, the pressure detection path 16 is connected to the pressure detector 22. As shown in FIG. 2, the pressure detector 22 has a piezoelectric conversion element 22a such as a piezo element, and outputs an electric signal having a current value or a voltage value according to the magnitude of the gas pressure in the pressure detection path 16.
The pressure detector 22 and the signal converter 23 are connected by wire by an electric signal line 24.

As shown in FIG. 2, the signal converter 23 includes an input circuit 23a, an A / D conversion unit 23b, and a communication unit 23c. The input circuit 23a receives an electric signal from the pressure detector 22 via the electric signal line 24.
The A / D conversion unit 23b converts the electric signal into a digital signal. Specifically, the A / D conversion unit 23b sets a specific current value (electric signal) within a certain range (for example, about 4 mA to 20 mA) from the pressure detector 22 in a certain numerical range (for example, 0 to 4000). It is replaced with a specific binary numerical value (digital signal) corresponding to the specific current value in.
The communication unit 23c transmits the digital signal by wire or wirelessly.

As shown in FIG. 1, the mobile terminal 30 is composed of a portable PC terminal such as a smartphone, a tablet, or a notebook computer. The mobile terminal 30 includes a CPU 31, a communication unit 32, a storage unit 33, and a display 34. The communication units 32 and 23c of the mobile terminal 30 and the signal converter 23 can communicate with each other by wire or wirelessly. Examples of the wired connection means include a USB cable. Examples of the wireless connection means include Bluetooth (registered trademark), WiFi, infrared rays and the like.
Preferably, the communication unit 23c of the signal converter 23 can transmit the radio wave of the Bluetooth standard, and the communication unit 32 of the mobile terminal 30 can receive the radio wave of the Bluetooth standard. The mobile terminal 30 and the signal converter 23 are paired by Bluetooth so as to be capable of wireless communication.

As shown in FIG. 2, the storage unit 33 of the mobile terminal 30 stores a processing program 35 for a seam inspection and setting data 36. The seam inspection processing program 35 receives the digital signal from the signal converter 23, accumulates it as the internal pressure detection value of the closed space 6c, and determines the quality of the seam 6 based on the accumulated data, and makes the determination. The mobile terminal 30 is made to execute the process of displaying the result on the display 34.

Examples of the seam inspection setting data 36 include data such as a pass / fail determination threshold value and a pass / fail determination time. The threshold value is set to, for example, about 60% to 90%, preferably about 80% of the test pressure. For example, when the test pressure is 0.15 MPa, the threshold value is preferably set to 0.12 MPa.
The pass / fail judgment time is, for example, about several minutes, preferably about 2 minutes.
The storage unit 33 is provided with an inspection information storage area 37 for storing the quality inspection information such as the accumulated data of the digital signal and the internal pressure detection value and the determination result.

Further, the storage unit 33 stores a program 38 and data 39 for creating and displaying a form from the quality inspection information. The data 39 includes, for example, the format (format data) of the seam inspection report 50 illustrated in FIG. 3 as a form. As shown in FIG. 3, the seam inspection report 50 includes a graph 51 and a table 52 of the change with time of the internal pressure of the closed space 6c, and a display 53 of the quality determination result.

The quality inspection information such as the seam inspection report 50 can be displayed on the display 34 of the mobile terminal 30, preferably on the browser mounted on the mobile terminal 30.

As shown in FIGS. 1 and 2, the seam inspection system 9 further includes a management personal computer 40. The management personal computer 40 includes a CPU 41, a communication unit 42, a storage unit 43, and a display 44. The communication units 42 and 32 of the management personal computer 40 and the mobile terminal 30 can communicate with each other by wire or wirelessly. The storage data of the mobile terminal 30 may be transferred to the management personal computer 40 via an external storage medium such as an SD card.

The storage unit 43 of the management personal computer 40 is provided with an inspection information storage area 47 for storing the quality inspection information received from the mobile terminal 30. Further, the storage unit 43 stores a program 48 and data 49 for creating and displaying a form from the quality inspection information of the storage area 47. The program 48 and the data 49 have the same configuration as the program 38 and the data 39 of the mobile terminal 30. The data 49 includes, for example, the format data (format data) of the seam inspection report 50 illustrated in FIG. 3 as a form. The pass / fail inspection information such as the seam inspection report 50 can be displayed on the display 44 of the management personal computer 40, and preferably can be displayed on the browser mounted on the management personal computer 40.

The seam 6 of the waterproof sheet 2 is determined to be good or bad as follows.
As shown in FIG. 1, first, a closed space 6c is defined inside the seam 6. The closed space 6c extends along the longitudinal direction of the waterproof sheet 2 (the circumferential direction of the arch portion of the tunnel 1). Both ends of the closed space 6c in the width direction are defined by welding portions 6a and 6b. Although not shown, both ends of the closed space 6c in the longitudinal direction are sealed by sandwiching the seam 6 with a clip or the like.

Subsequently, the pressure detecting needle 12 of the seam inspection system 9 is pierced into the portion between the welded portions 6a and 6b in one impermeable sheet 4, and the tip of the pressure detecting needle 12 faces the closed space 6c.
Next, the open / close valve 14 is opened. As a result, the air pressure from the air compressor 11 is adjusted to a predetermined test pressure by the pressure adjusting valve 13 and then introduced from the pressure detecting needle 12 into the closing space 6c. After that, the open / close valve 14 is closed.

The internal pressure of the closing space 6c is equal to the internal pressure of the inspection path 10 on the downstream side of the on-off valve 14. The internal pressure of the inspection path 10 and thus the closed space 6c is detected by the pressure detector 22, and is continuously output as an electric signal (analog signal) such as a voltage value.
The electric signal is input to the signal converter 23 and converted into a digital signal.
The digital signal is transmitted from the signal converter 23. The transmission interval of the digital signal is preferably 1 second or less to several seconds.
Since the pressure detector 22 and the signal converter 23 are housed in the waterproof housing 21, it is possible to prevent the pressure detector 22 and the signal converter 23 from getting wet with water in the tunnel and failing.

The inspection worker A activates the inspection processing program 35 of the mobile terminal 30 in advance. As a result, the inspection data acquisition start button 34a and the like are displayed on the display 34. Further, the digital signal from the signal converter 23 is received by the mobile terminal 30.
After the opening / closing valve 14 is closed, the inspection worker A issues an inspection data acquisition start command by pressing the button 34a in the display 34.
The mobile terminal 30 that has received the command stores the digital signal in the inspection information storage area 37 every time it receives a digital signal during a certain inspection period (for example, several minutes, preferably about 2 minutes). The digital signal represents the internal pressure value of the closed space 6c. As a result, time-dependent change data (pass / fail determination information) of the internal pressure of the closed space 6c is accumulated.
The numerical value of the digital signal may be stored as it is, or may be stored after being converted into the internal pressure value of the closed space 6c.

The mobile terminal 30 determines the quality of the seam 6 based on the time-dependent change data. That is, if the internal pressure of the closed space 6c does not fall below the threshold value during the inspection period, it is judged as "good", and if it falls below the threshold value, it is judged as "bad".
The determination result is stored in the inspection information storage area 37 and displayed on the display 34. As a result, the inspection worker A can know the quality of the welded portions 6a and 6b of the seam 6. That is, if the welding is good, the internal pressure of the closed space 6c is substantially maintained at the introduction test pressure, and at least does not fall below the threshold value. If there is poor welding, air leaks from it, so the internal pressure of the closed space 6c drops and falls below the threshold value. If it is determined to be "defective", the welding of the seam 6 is redone. As a result, water leakage from the seam 6 can be reliably prevented.
As described above, according to the present system 9, a digital signal indicating the internal pressure value of the closed space 6c is input to the mobile terminal 30, and the quality of the seam 6 is determined in the mobile terminal 30. Therefore, there is no concern that human reading errors or recording errors will occur, and the accuracy of the inspection can be guaranteed.
According to this system 9, the number of acquired data of the internal pressure change in the closed space 6c can be significantly increased as compared with reading the analog gauge by human eyes. For example, when reading with the human eye, only about one data is acquired per minute at most, but according to this system 9, several data are acquired per second corresponding to the output interval of digital signals. Degree of data can be obtained. Therefore, the change with time of the internal pressure of the closed space 6c can be accurately grasped, and detailed analysis can be performed. For example, if the internal pressure drops sharply, it can be inferred that there are large welding defects.

Further, the mobile terminal 30 creates a seam inspection report 50 (FIG. 3) from the quality inspection information of the inspection information storage area 37 in response to the form display command by the inspection worker A or the like, and displays it on the display 34. As a result, the inspection worker A can confirm the change with time of the internal pressure of the closed space 6c from the graph 51 and the like in the seam inspection report 50.
The mobile terminal 30 can read and display not only the quality inspection information of the seam being inspected but also the past quality inspection information stored in the inspection information storage area 37. This makes it possible to accurately manage the joint construction of the waterproof sheet.

The quality inspection information of the inspection information storage area 37 is transferred from the mobile terminal 30 to the management personal computer 40 and stored in the management personal computer 40 as well. The transfer may be executed according to the input operation of the mobile terminal 30 or the management personal computer 40, or may be automatically executed depending on the amount of data and the time.
Since it is not necessary for a person to manually input each data of the quality inspection information, it is possible to eliminate an input error.

The management personal computer 40 creates a seam inspection report 50 (FIG. 3) from the quality inspection information of the inspection information storage area 47 in response to a form display command by the work manager B or the like, and displays or prints the seam inspection report 50 (FIG. 3) on the display 44. do. As a result, the work manager B can confirm the change with time of the internal pressure of the closed space 6c from the graph 51 and the like in the seam inspection report 50. The management personal computer 40 can read and display the past quality inspection information stored in the inspection information storage area 47. This makes it possible to accurately manage the joint construction of the waterproof sheet.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the waterproof sheet is not limited to a tunnel, but may be laid in a golf course, an industrial waste treatment plant, or the like.
Of the mobile terminal 30 and the management personal computer 40, only the management personal computer 40 has a function of creating and displaying a form, that is, a program 48 and a data 49, and the mobile terminal 30 is not equipped with the program 38 and the data 39. good.
The inspection circuit of the seam inspection system 9 can be appropriately modified. For example, the pressure adjusting valve 13 may be arranged between the on-off valve 14 and the pressure detection branch portion 15.

The present invention can be applied to, for example, a quality inspection of a seam treatment of a waterproof sheet such as a tunnel.

2 Waterproof sheet 4 Impermeable sheet 6 Seam 6a, 6b Welding part 6c Closed space 9 Seam inspection system 10 Inspection path 20 Inspection unit 21 Waterproof housing 22 Pressure detector 23 Signal converter 30 Mobile terminal 40 Management PC 50 Seam inspection report ( Form)

Claims (2)

It is a system that inspects the quality of the seams of the waterproof sheet.
An inspection path that introduces test pressure into the closed space defined in the seam,
A pressure detector that detects the internal pressure of the closed space via the inspection path and outputs it as an electrical signal.
A signal converter that converts the electrical signal into a digital signal and outputs it.
It is equipped with a mobile terminal that receives the digital signal and generates pass / fail inspection information, a pressure detection path is branched from the inspection path, and an inspection unit is connected to the pressure detection path.
The inspection unit has a waterproof housing having a waterproof structure, the pressure detector, and the signal converter, and the pressure detector and the signal converter are housed in the waterproof housing.
The pressure detection path is inserted into the inside of the waterproof housing through a port provided in the waterproof housing, and is connected to the pressure detector in the waterproof housing.
The pressure detector and the signal converter are connected by wire by an electric signal line provided in the waterproof housing.
A seam inspection system for a waterproof sheet , wherein the signal converter includes a communication unit that communicates with the mobile terminal by wire or wirelessly . In the storage unit of the mobile terminal, a process of accumulating a digital value corresponding to the internal pressure of the closed space, a process of determining the quality of the seam based on the accumulated data, and a change over time of the internal pressure of the closed space. The seam inspection system according to claim 1 , wherein a program for causing the mobile terminal to execute a process of displaying the quality inspection information including the quality determination result is stored .

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