JP7382454B2 - Tarpaulin seam inspection system and program - Google Patents

Description

The present invention relates to a system and a program for inspecting the quality of joints of waterproof sheets, and particularly to a system and program for inspecting the sealing properties (liquid tightness, airtightness) of joints where adjacent waterproof sheets are joined by welding or the like. and programs.

For example, in mountain tunnels such as NATM (New Austrian Tunneling Method) tunnels, a waterproof sheet such as an EVA sheet is stretched between a primary lining such as shotcrete and a secondary lining (see Patent Document 1, etc.) ). The waterproof sheet prevents spring water from the ground from flowing into the secondary lining concrete and, ultimately, into the tunnel interior.

The waterproof sheet has a width of several meters, and is stretched around the arch of the tunnel in the circumferential direction with its width direction facing the tunnel axis. A plurality of waterproof sheets are arranged in the axial direction of the tunnel, and a seam between these waterproof sheets is formed by welding the ends of adjacent waterproof sheets to each other. If there is poor welding, water may leak from the joint, so a joint inspection is performed.

Japanese Patent Application Publication No. 2016-113801

Seam inspection is generally performed by pressure testing. Specifically, a closed space is defined within the joint by the welded portion, and a test pressure using compressed air is introduced into the closed space. If the welding is good, the internal pressure of the closed space is maintained approximately at the test pressure when compressed air is introduced. If there is a defect in welding, air will leak from there, causing the internal pressure in the closed space to drop. Therefore, by measuring the internal pressure of the closed space with a pressure detector, it is possible to determine the quality of the joint. Pressure sensors are typically analog gauges.

However, because pressure values are read by checking analog gauges with the human eye, false judgments are likely to occur. Errors are also likely to occur when recording test results in a notebook or inputting them into a computer. Photographs of the inspected site are sometimes taken as evidence of the inspection, but the accuracy of the inspection is not guaranteed. Furthermore, changes in detected pressure over time are only read, for example, about once per minute, and no detailed analysis has been conducted.
In view of the above circumstances, it is an object of the present invention to improve the accuracy of seam inspection of waterproof sheets, increase the number of acquired data, and enable detailed analysis.

In order to solve the above problems, the present invention provides a system for inspecting the quality of the joints of a waterproof sheet, comprising:
an inspection path for introducing a test pressure into a closed space defined within the joint;
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 the digital signal;
A mobile terminal that receives the digital signal and generates quality inspection information.
Preferably, the system of the present invention is a system for inspecting the quality of seams of a waterproof sheet,
an inspection path for introducing a test pressure into a closed space defined within the joint;
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 the digital signal;
a mobile terminal that receives the digital signal and generates quality inspection information; the storage unit of the mobile terminal includes a process for storing a digital value corresponding to the internal pressure of the closed space; and a process for storing a digital value corresponding to the internal pressure of the closed space; A program is stored in the mobile terminal that causes the mobile terminal to execute a process of determining the quality of the joint, and a process of displaying quality inspection information including a change in internal pressure of the closed space over time and a result of the quality determination. Features.
Preferably, the program according to the present invention is a program stored in a storage unit of a mobile terminal in the seam inspection system, and includes a process of accumulating a digital value corresponding to the internal pressure of the closed space, and a process of accumulating the digital value corresponding to the internal pressure of the closed space. The mobile terminal is caused to perform a process of determining whether the joint is good or bad based on the above-mentioned information, and a process of displaying quality inspection information including a temporal change in the internal pressure of the closed space and a result of the judgment of the quality.

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, no human reading or recording errors occur, and the accuracy of the test is guaranteed.
Furthermore, compared to reading an analog gauge with the human eye, it is possible to significantly increase the amount of data acquired regarding changes in internal pressure in a closed space, making it possible to perform detailed analysis. For example, if the internal pressure decreases rapidly, it can be inferred that there is a large welding defect.

Preferably, the pressure sensor and signal converter are housed in a waterproof housing.
This can prevent the pressure sensor and signal converter from getting wet and malfunctioning.

Further, the method of the present invention is a method of inspecting the quality of the seams of a waterproof sheet, comprising:
introducing a test pressure into a closed space defined within the seam;
Detecting the internal pressure of the closed space with a pressure detector and outputting it as an electrical signal;
converting the electrical signal into a digital signal using a signal converter and outputting the digital signal;
The present invention is characterized by comprising the step of receiving the digital signal by a mobile terminal and generating pass/fail inspection information.
The quality inspection information includes the digital signal, accumulated information on the internal pressure detection value of the closed space, judgment information on whether it is good or bad, a seam inspection report and other forms in which the internal pressure changes over time, judgment results, etc. can be mentioned.
"Generating quality inspection information" includes accumulating the received data of the digital signal and also the detected internal pressure value, obtaining information on whether it is good or bad, creating and displaying the form, etc. .

According to the present invention, it is possible to improve the accuracy of seam inspection of waterproof sheets, and furthermore, it is possible to increase the number of acquired data and perform detailed analysis.

FIG. 1 is an explanatory diagram showing how a tunnel waterproof sheet is inspected for seams using a seam inspection system according to an 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.

An embodiment of the present invention will be described below 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 over the inner surface (lower surface in FIG. 1) of the shotcrete 3 facing inside the tunnel. The waterproof sheet 2 has a laminated structure of a water-impermeable sheet 4 made of EVA resin or the like and a water-permeable sheet 5 made of non-woven fabric or the like. A permeable sheet 5 faces the shotcrete 3. The impermeable sheet 4 faces a secondary lining (not shown). Note that the secondary lining is constructed inside the tunnel of the waterproof sheet 2 (lower side in FIG. 1). The impermeable sheet 4 prevents spring water from the ground 8 from flowing into the secondary lining and eventually into the tunnel interior space. The spring water passes through the inside of the permeable sheet 5 and is discharged.

One waterproof sheet 2 has a width of several meters, and its width direction is oriented in the tunnel axis direction (left and right in FIG. direction). A plurality of waterproof sheets 2 are arranged in the tunnel axis direction (horizontal direction in FIG. 1). The ends of the water-impermeable sheets 4 of two adjacent waterproof sheets 2 are joined by welding to form a seam 6 (sheet connection portion).

At least two welded parts 6a and 6b are formed in the seam 6. The welded portion 6a is arranged near the edge 4e of the water-impermeable sheet 4. The welded portion 6b is arranged further away from the edge 4e than the welded portion 6a. The welded parts 6a and 6b extend linearly without interruption over the entire length of the waterproof sheet 2 in the longitudinal direction (direction perpendicular to the plane of paper in FIG. 1). The ends of the two water-impermeable sheets 4 welded by these welds 6a and 6b are pushed down to one side (the right side in FIG. It is joined with 4.

As shown in FIG. 1, after the seam 6 is formed, a 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 constituted by a gas tube or the like. An air compressor 11 (test pressure source) is connected to the upstream end of the test path 10. A hollow pressure detection needle 12 is provided at the downstream end of the inspection path 10. A pressure regulating valve 13, an opening/closing valve 14, and a pressure detecting branch section 15 are provided in the intermediate portion of the inspection path 10 in this order from the upstream side. The secondary pressure of the pressure regulating valve 13 is adjusted to a predetermined test pressure. The magnitude of the test pressure is set depending on the type, material, thickness, etc. of the waterproof sheet, and is, for example, more than 1 atmosphere and less than several atmospheres.
A pressure detection path 16 is branched from the pressure detection branch portion 15 . A test unit 20 is connected to the pressure test path 16 .

The inspection unit 20 includes 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 to prevent water from entering inside. The pressure detection path 16 is inserted into the waterproof housing 21 through the port 21 of the waterproof housing 21. The inner circumferential surface of the port 21c and the outer circumferential surface of the tube constituting the pressure detection path 16 are liquid-tightly sealed by a sealing material (not shown) such as an O-ring or packing.

As shown in FIG. 1, the waterproof housing 21 houses a pressure detector 22 and a signal converter 23. Inside the waterproof housing 21, a pressure detection path 16 is connected to a pressure detector 22. Figure 2
As shown in FIG. 2, the pressure detector 22 includes a piezoelectric transducer 22a such as a piezo element, and outputs an electric signal having a current value or voltage value depending on 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 through an electric signal line 24 .

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

As shown in FIG. 1, the mobile terminal 30 is configured by a portable PC terminal such as a smartphone, a tablet, or a notebook computer. Mobile terminal 30 includes a CPU 31, a communication section 32, a storage section 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. An example of a wired connection means is a USB cable. Examples of wireless connection means include Bluetooth (registered trademark), WiFi, and infrared rays.
Preferably, the communication unit 23c of the signal converter 23 is capable of transmitting radio waves conforming to the Bluetooth standard, and the communication unit 32 of the mobile terminal 30 is capable of receiving radio waves conforming to the Bluetooth standard. The mobile terminal 30 and the signal converter 23 are paired to enable wireless communication via Bluetooth.

As shown in FIG. 2, the storage unit 33 of the mobile terminal 30 stores a processing program 35 and setting data 36 for seam inspection. The seam inspection processing program 35 receives the digital signal from the signal converter 23, stores it as a detected value of internal pressure in the closed space 6c, determines whether the seam 6 is good or bad based on the stored data, and performs the judgment. The mobile terminal 30 is caused to execute a process of displaying the results on the display 34.

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

Furthermore, 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 a 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 changes over time in the internal pressure of the closed space 6c, and a display 53 of the quality determination results.

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 a browser installed in the mobile terminal 30.

As shown in FIGS. 1 and 2, the seam inspection system 9 further includes a management computer 40. The management personal computer 40 includes a CPU 41, a communication section 42, a storage section 43, and a display 44. The communication units 42 and 32 of the management computer 40 and the mobile terminal 30 can communicate with each other by wire or wirelessly. The data stored in the mobile terminal 30 may be transferred to the management 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 that stores 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 in the storage area 47. The program 48 and data 49 have the same configuration as the program 38 and data 39 of the mobile terminal 30. The data 49 includes format data (format data) of a seam inspection report 50 illustrated in FIG. 3, for example, as a form. The quality/failure inspection information such as the seam inspection report 50 can be displayed on the display 44 of the management computer 40, preferably on a browser installed in the management computer 40.

The quality of the seam 6 of the waterproof sheet 2 is determined as follows.
As shown in FIG. 1, first, a closed space 6c is defined inside the joint 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 welded parts 6a and 6b. Although not shown, both longitudinal ends of the closed space 6c are sealed by pinching the joint 6 with clips or the like.

Subsequently, the pressure detection needle 12 of the seam inspection system 9 is pierced into the portion between the welded parts 6a and 6b of one water-impermeable sheet 4, so that the tip of the pressure detection needle 12 faces the closed space 6c.
Next, open the on-off valve 14. As a result, the air pressure from the air compressor 11 is adjusted to a predetermined test pressure by the pressure adjustment valve 13, and then introduced into the closed space 6c through the pressure detection needle 12. After that, the on-off valve 14 is closed.

The internal pressure of the closed space 6c is equal to the internal pressure of the inspection path 10 downstream of the on-off valve 14. The internal pressure of the inspection path 10 and thus of the closed space 6c is detected by the pressure detector 22, and is continuously output as an electrical signal (analog signal) such as a voltage value.
The electrical signal is input to a 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 one second or less to several seconds.
Since the pressure detector 22 and the signal converter 23 are housed in the waterproof casing 21, they can be prevented from breaking down due to getting wet with water in the tunnel.

Inspection worker A activates the inspection processing program 35 of the mobile terminal 30 in advance. As a result, the test data acquisition start button 34a and the like are displayed on the display 34. Further, a digital signal from the signal converter 23 is received by the mobile terminal 30.
After closing the opening/closing valve 14, 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 received the command stores the digital signal in the test information storage area 37 every time it receives a digital signal during a certain test 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, data on changes over time in the internal pressure of the closed space 6c (quality determination information) is accumulated.
The numerical value of the digital signal may be stored as it is, or it may be stored after being converted into the internal pressure value of the closed space 6c.

The mobile terminal 30 determines whether the seam 6 is good or bad based on the temporal change data. That is, during the inspection period, if the internal pressure of the closed space 6c does not fall below the threshold value, it is determined to be "good", and if it falls below the threshold value, it is determined to be "bad".
The determination result is stored in the test information storage area 37 and displayed on the display 34. This allows the inspection operator A to know whether the welded parts 6a, 6b of the seam 6 are good or bad. That is, if the welding is good, the internal pressure of the closed space 6c is maintained approximately at the introduction test pressure, and at least does not fall below the threshold value. If there is poor welding, air will leak from there, and the internal pressure of the closed space 6c will drop and fall below the threshold value. If it is determined to be "defective", the welding of the seam 6 is redone. Thereby, water leakage from the joint 6 can be reliably prevented.
In this way, 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 need to worry about human reading or recording errors, and the accuracy of the test can be guaranteed.
According to the present system 9, the number of acquired data regarding internal pressure changes in the closed space 6c can be significantly increased compared to reading an analog gauge with the human eye. For example, when reading with the human eye, only one piece of data was acquired per minute at most, but with this system 9, data is acquired several times per second, corresponding to the output interval of the digital signal. It is possible to obtain data on the extent. Therefore, it is possible to accurately grasp the change over time in the internal pressure of the closed space 6c, and perform detailed analysis. For example, if the internal pressure decreases rapidly, it can be inferred that there is a large welding defect.

Further, the mobile terminal 30 creates a seam inspection report 50 (FIG. 3) from the pass/fail inspection information in the inspection information storage area 37 in response to a form display command from the inspection worker A or the like, and displays it on the display 34. Thereby, the inspection operator A can confirm the change over time in the internal pressure of the closed space 6c from the graph 51 etc. in the seam inspection report 50.
The mobile terminal 30 can read out and display not only quality inspection information of the seam under inspection but also past quality inspection information accumulated in the inspection information storage area 37. This allows for accurate management of waterproof sheet joint construction.

The quality inspection information in the inspection information storage area 37 is transferred from the mobile terminal 30 to the management computer 40 and is also stored in the management computer 40 . The transfer may be executed according to an input operation on the mobile terminal 30 or the management computer 40, or may be executed automatically depending on the amount of data or time.
Since there is no need for people to manually input each data of pass/fail inspection information, input errors can be eliminated.

The management personal computer 40 creates a seam inspection report 50 (FIG. 3) from the pass/fail inspection information in the inspection information storage area 47 in response to a document display command from the work manager B, etc., and displays it on the display 44 or prints it. do. Thereby, the work manager B can confirm the change over time in the internal pressure of the closed space 6c from the graph 51 etc. in the seam inspection report 50. The management personal computer 40 can read and display past pass/fail inspection information stored in the inspection information storage area 47. This allows for accurate management of waterproof sheet joint construction.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit thereof.
For example, the waterproof sheet is not limited to use in tunnels, but may be installed in golf courses, industrial waste disposal sites, and the like.
Of the mobile terminal 30 and the management computer 40, only the management computer 40 has a function of creating and displaying forms, that is, a program 48 and data 49, and even if the mobile terminal 30 is not equipped with the program 38 and data 39, good.
The inspection circuit of the seam inspection system 9 can be modified as appropriate. For example, the pressure regulating valve 13 may be arranged between the opening/closing valve 14 and the pressure detection branch 15.

INDUSTRIAL APPLICATION This invention is applicable to the quality inspection of the joint processing of a waterproof sheet, such as a tunnel, for example.

2 Waterproof sheet 4 Impermeable sheet 6 Seams 6a, 6b Welded portion 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 33 Storage section 35, 38 Program 40 Management PC 50 Seam inspection report (form)

Claims (2)

A system for inspecting the quality of joints of waterproof sheets,
an inspection path for introducing a test pressure into a closed space defined within the joint;
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; the pressure sensor and the signal converter. an inspection unit having a waterproof casing for accommodating the device;
a mobile terminal comprising a portable PC terminal that receives the digital signal outside the inspection unit, determines the quality of the seam , and generates quality inspection information, and a storage section of the mobile terminal includes: a process of accumulating a digital value corresponding to the internal pressure of the closed space; a process of determining the quality of the joint based on the accumulated data; and a process of determining the quality of the joint based on the accumulated data; A seam inspection system characterized by storing a program that causes the mobile terminal to execute a process of displaying inspection information. 2. A program stored in a storage unit of a mobile terminal in the seam inspection system according to claim 1, comprising processing for accumulating a digital value corresponding to the internal pressure of the closed space, and determining the quality of the seam based on the accumulated data. and a process for displaying pass/fail test information including a temporal change in the internal pressure of the closed space and a pass/fail determination result.

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