Waterproof sheet inspection device

Abstract

To enable inspection cost to be reduced by enhancing the efficiency of inspection work for inspecting a laying condition of a waterproof sheet.SOLUTION: A waterproof sheet inspection device 1 includes a booster pump 2 for outputting compressed air, a positive / negative pressure switching part for switching internal pressure of an air circulation pipe part 51 to positive pressure and negative pressure by switching a flow passage of the compressed air introduced from the booster pump 2, a pressure transmitter 6 connected to the air circulation pipe part 51 to enable pressure detection, an adapter mounting part 52 provided on an inspection point side of the air circulation pipe part 51 to selectively and freely mounting an inspection needle mounting part of an inspection needle 81 for pressure inspection and a suction hose 82 of negative pressure inspection, and a determination device 7 for determining the acceptance / rejection of a laying condition of a waterproof sheet 10 according to pressure information received from the pressure transmitter 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waterproof sheet inspection device for inspecting the state of installation of a waterproof sheet. [Background technology]

[0002] Conventional inspection devices for inspecting the installation status of waterproof sheets include those described in Patent Documents 1 and 2. The inspection device in Patent Document 1 introduces test pressure applied by an air compressor from an inspection path into an enclosed space defined within a joint in a waterproof sheet laid in a tunnel or the like, detects the internal pressure of the enclosed space with a pressure detector, converts the internal pressure of the enclosed space into a digital signal with a signal converter and sends it to a mobile terminal, which generates pass / fail inspection information for the joint location.

[0003] The inspection device in Patent Document 2 is a device that inspects the quality of damaged and repaired areas of a waterproof sheet. It covers the damaged and repaired area of ​​the waterproof sheet with a closing jig to define a closed space between the damaged and repaired area and the closing jig, introduces negative test pressure into the closed space using a vacuum pump, acquires the internal pressure of the closed space, converts it into a digital signal and sends it to a processing terminal, which then generates inspection information on the quality of the damaged and repaired area. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-96101 [Patent Document 2] Japanese Patent Publication No. 2023-34743 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when using the inspection devices of Patent Documents 1 and 2 to inspect the condition of the seams of the waterproof sheet and the condition of the damaged and repaired areas of the waterproof sheet, it is necessary to use two separate inspection devices: the inspection device of Patent Document 1, which has an air compressor equivalent to a pressurizer, and the inspection device of Patent Document 2, which has a vacuum pump equivalent to a negative pressure machine.

[0006] If separate inspection devices are used to inspect the condition of the waterproof sheet's seams and the condition of the damaged and repaired areas of the waterproof sheet, the efficiency of the inspection work will decrease and the inspection costs will increase, so there is a demand for an inspection device that can be used to inspect both the condition of the waterproof sheet's seams and the condition of the damaged and repaired areas of the waterproof sheet.

[0007] The present invention has been proposed in consideration of the above-mentioned problems, and aims to provide a waterproof sheet inspection device that can improve the efficiency of inspection work to inspect the installation status of waterproof sheets and reduce inspection costs. [Means for solving the problem]

[0008] The waterproof sheet inspection device of the present invention is characterized by comprising a pressure pump that outputs compressed air, a positive / negative pressure switching unit that switches the flow path of the compressed air introduced from the pressure pump to switch the internal pressure of the air flow pipe between positive and negative pressure, a pressure transmitter that can detect pressure and is connected to the air flow pipe, an adapter mounting unit that is provided on the inspection point side of the air flow pipe and can selectively attach an inspection needle mounting unit for an inspection needle for a pressure inspection and a suction hose for a negative pressure inspection, and a judgment device that judges whether the installation status of the waterproof sheet is acceptable or not based on the pressure information received from the pressure transmitter. This allows the adapter mounting section to be selectively connected to the test needle mounting section of the test needle for pressure testing and the suction hose for negative pressure testing, and the positive / negative pressure switching section to switch the internal pressure of the air flow pipe between positive and negative pressure. This allows the same testing device to perform both pressure testing and negative pressure testing to inspect the installation condition of the waterproof sheet, and to inspect both the condition of the waterproof sheet's seams and the condition of damaged or repaired areas. This improves the efficiency of the inspection work to inspect the installation condition of the waterproof sheet and reduces inspection costs. Furthermore, the procedures for pressure testing and negative pressure testing are largely the same, reducing the chance of errors during the inspection work.

[0009] The waterproof sheet inspection device of the present invention is characterized in that the judgment device receives pressure information from the pressure transmitter continuously from the start to the end of the inspection time, calculates the pressure change rate of the end inspection pressure relative to the start inspection pressure of the inspection time, and compares the pressure change rate with a threshold value to determine whether the installation status of the waterproof sheet is acceptable or not. According to this, by comparing the rate of change of the pressure at the end of the test relative to the pressure at the start of the test during the test period with a threshold value to determine whether the waterproof sheet is installed, the degree of freedom in the pressure value at the start of the test can be increased, and the degree of freedom and flexibility in the inspection work for the installation of the waterproof sheet can be increased. In addition, the pass / fail judgment of the pressurized test and the pass / fail judgment of the negative pressure test can be made based on the same rate of change of pressure, making it easier to understand the evaluation levels of airtightness in the pressurized test and the negative pressure test.

[0010] The waterproof sheet inspection device of the present invention is characterized in that the pressure pump is communicatively connected to the judgment device, and the pressure pump outputs compressed air in response to a drive start command sent from the judgment device, and the pressure pump stops outputting compressed air in response to a drive stop command sent from the judgment device. According to this, by controlling the operation of the pressure pump using a determination device that is communicatively connected to the pressure pump, it becomes possible to control the operation of the pressure pump from a location away from the pressure pump, thereby improving the ease and flexibility of inspecting the installation status of the waterproof sheet.

[0011] The waterproof sheet inspection device of the present invention is characterized in that the inspection needle attachment portion is an attachment hose that communicates with the inside of the inspection needle and has approximately the same outer diameter as the suction hose. This allows the attachment and detachment of the test needle attachment part of the test needle for pressurized testing to the adapter attachment part, and the attachment and detachment of the suction hose for negative pressure testing to be performed using the same procedure, thereby standardizing the attachment and detachment procedures for the adapter attachment part. [Effects of the Invention]

[0012] According to the waterproof sheet inspection device of the present invention, the efficiency of the inspection work for inspecting the installation state of the waterproof sheet can be improved and the inspection cost can be reduced. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a block diagram showing the overall configuration of a waterproof sheet inspection device according to an embodiment of the present invention. [Figure 2] 5A and 5B are explanatory diagrams illustrating a switching portion of a positive / negative pressure switching unit in the waterproof sheet inspection device according to the embodiment. [Figure 3] FIG. 1A is a block diagram showing the waterproof sheet inspection device of the embodiment with a test needle for pressure testing attached thereto, and FIG. 1B is a longitudinal cross-sectional view showing the details of the area around the adapter attachment portion in FIG. [Figure 4] (a) is a block diagram showing the state in which a suction hose for negative pressure testing is attached to the waterproof sheet inspection device of the embodiment, and (b) is a vertical cross-sectional view showing details of the area around the adapter mounting portion in the same figure (a). [Figure 5] FIG. 2 is a block diagram of a determination device in the waterproof sheet inspection device of the embodiment. [Figure 6] This is a perspective view showing the area around the joint and the damaged repair area in the waterproof sheet laid in the tunnel. [Figure 7] FIG. 2 is a perspective view illustrating a pressure test performed by the waterproof sheet inspection device according to the embodiment. [Figure 8]4 is a flowchart showing a pressurized inspection process performed by the waterproof sheet inspection device of the embodiment. [Figure 9] FIG. 2 is a perspective view illustrating a negative pressure inspection performed by the waterproof sheet inspection device according to the embodiment. [Figure 10] 4 is a flowchart showing a negative pressure inspection process performed by the waterproof sheet inspection device of the embodiment. [Figure 11] 10A and 10B are explanatory diagrams illustrating a switching portion of a positive / negative pressure switching unit according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] [Waterproof sheet inspection device according to an embodiment] As shown in Figures 1 to 4, a waterproof sheet inspection device 1 of an embodiment of the present invention comprises a pressure pump 2 that outputs compressed air, a positive / negative pressure switching unit 3 into which compressed air is introduced from the pressure pump 2 which corresponds to a positive / negative pressure switching section, an air hose 4 that delivers the compressed air output from the pressure pump 2 to the positive / negative pressure switching unit 3, a connection adapter 5 attached to the positive / negative pressure switching unit 3 and having an air flow pipe section 51 and an adapter mounting section 52, a pressure transmitter 6 attached to the connection adapter 5, and a determination device 7 that is capable of communicating with the pressure transmitter 6 via wireless communication or the like.

[0015] The pressure pump 2 in this embodiment has a control unit and a communication unit, and is communicably connected to the determination device 7 via wireless communication or the like, so that the pressure pump 2 outputs compressed air in response to a drive start command sent from the determination device 7, and stops outputting compressed air in response to a drive stop command sent from the determination device 7. Note that instead of this configuration, the pressure pump 2 may output compressed air in response to an input from a drive start input unit installed in the pressure pump 2, and stop outputting compressed air in response to an input from a drive stop input unit installed in the pressure pump 2.

[0016] The positive / negative pressure switching unit 3 switches the flow path of the compressed air introduced from the pressure pump 2 to switch the internal pressure of the air flow pipe 51 between positive and negative pressure, and in this example is configured as an ejector that can switch between positive pressure operation and negative pressure operation. The positive / negative pressure switching unit 3 shown in Figure 2 has an air introduction path 31, a nozzle 32, a diffuser 33, a branch path 34 that communicates with the nozzle 32 near its outlet, and an exhaust valve 35 that is provided at the outlet of the diffuser 33 and can be opened and closed freely.

[0017] When the exhaust valve 35 of the positive / negative pressure switching unit 3 is closed, the compressed air supplied from the pressure pump 2 is sent into the air flow pipe 51 via the branch passage 34 while maintaining a positive pressure state (see FIG. 2(a)). When the exhaust valve 31 of the positive / negative pressure switching unit 3 is open, it functions as an ejector, discharging the compressed air supplied from the pressure pump 2 from the exhaust valve 35 and creating a reduced pressure state inside the air flow pipe 51 by reducing the pressure in the branch passage 34.

[0018] The exhaust valve 35 of the positive / negative pressure switching unit 3 may be configured to be manually switched between the closed and open states, or the positive / negative pressure switching unit 3 may be provided with a control unit and a communication unit, and the positive / negative pressure switching unit 3 may be connected to the determination device 7 via wireless communication or the like so that the drive control unit installed in the positive / negative pressure switching unit 3 closes the exhaust valve 35 in response to a close command sent from the determination device 7, and the drive control unit installed in the positive / negative pressure switching unit 3 opens the exhaust valve 35 in response to an open command sent from the determination device 7.

[0019] The connection adapter 5 is connected to the positive / negative pressure switching unit 3 so that air can circulate, and is composed of an air flow pipe section 51 whose internal pressure can be switched between positive and negative pressure in response to switching between positive and negative pressure operation of the positive / negative pressure switching unit 3, and an adapter attachment section 52 which is provided on the test location side of the air flow pipe section 51 and to which a test needle attachment section of a test needle 81 for pressurized testing and a suction hose 82 for negative pressure testing can be selectively attached. In the illustrated example, the test needle attachment section of the test needle 81 is an attachment hose 811 which communicates with the inside of the test needle 81 and has approximately the same outer diameter as the suction hose 82 or is formed with the same outer diameter. The attachment hose 811 and suction hose 82 may be of any length depending on the test position.

[0020] The adapter mounting part 52 includes a cylindrical body 521, a seal ring 522 fitted inside the cylindrical body 521, a locking claw 523 fitted inside the cylindrical body 521 on the side of the seal ring 522 that is to be inspected, and a release tube 524. When an attachment hose 811 for pressurized testing or a suction hose 82 for negative pressure testing is inserted into the cylindrical body 521 of the adapter mounting part 522 from the side that is to be inspected all the way to the back of the seal ring 522, the locking claw 523 bites into the outer peripheral wall of the attachment hose 811 or the suction hose 82, thereby attaching the attachment hose 811 or the suction hose 82. When the attachment hose 811 or the suction hose 82 is removed from the cylindrical body 521 of the adapter mounting part 52, the release tube 524 is pushed into the cylindrical body 521 to bend the locking claw 523, thereby releasing the locking claw 523 from biting into the outer peripheral wall of the attachment hose 811 or the suction hose 82, allowing the attachment hose 811 or the suction hose 82 to be removed (see FIGS. 3(b) and 4(b)).

[0021] During a negative pressure test, a negative pressure test tool 83 is attached to the test point side of the suction hose 82. The negative pressure test tool 83 in this example has a transparent container- or dome-shaped storage section 831 whose interior can be seen, and a seal section 832 provided on the periphery of the storage section 831, and is attached to the suction hose 82 so that the interior of the storage section 831 communicates with the suction hose 82 (see FIG. 4).

[0022] A pressure transmitter 6 capable of detecting pressure is connected to the air flow pipe 51, and in the illustrated example, the pressure transmitter 6 is attached in the radial direction of the circular pipe-shaped air flow pipe 51. The pressure transmitter 6 has a control unit and a communication unit such as a wireless communication unit, and converts the detected pressure into an electric signal and outputs it to the determination device 7 via the communication unit.

[0023] The determination device 7 is configured to determine whether the waterproof sheet is installed properly based on the pressure information received from the pressure transmitter 6, and is configured, for example, as a portable tablet. As shown in Figure 5, the determination device 7 includes a control unit 71 such as an MPU or CPU, a memory unit 72 configured with an HDD, SSD, flash memory, EEPROM, ROM, RAM, etc., an input unit 73 such as a touch panel, mouse, keyboard, etc., a display unit 74 such as a touch panel or display that also serves as the input unit 73, a communication interface 75 for wireless communication, etc., and a timer 76.

[0024] The memory unit 72 has a control program storage unit 721 in which predetermined control programs including test programs for pressurization tests and negative pressure tests are stored, and the control unit 71 executes predetermined processes in accordance with the predetermined control programs. The memory unit 72 also has a test start pressure storage unit 722 in which the test start pressure for the pressurization test and the test start pressure for the negative pressure test input from the input unit 73 are stored, a test time storage unit 723 in which the test time for the pressurization test and the test time for the negative pressure test input from the input unit 73 are stored, a pressure information recording unit 724 in which pressure information continuously transmitted from the pressure transmitter 6 during the pressurization test and the negative pressure test, a threshold storage unit 725 in which the threshold value for the pressurization test and the threshold value for the negative pressure test are stored, and a management recording unit 726 in which test results such as pass information for the pressurization test or the negative pressure test are recorded in association with management identification information.

[0025] Pressure testing and negative pressure testing using the waterproof sheet inspection device 1 of this embodiment are performed when inspecting the installation state of the waterproof sheet 10, for example, when sprayed concrete 202 is poured on the inner periphery of the ground 201 of a tunnel T shown in Figure 6 and the waterproof sheet 10 is laid along the inner surface of the sprayed concrete 202.

[0026] The waterproof sheet 10 in the illustrated example is constructed by laminating and bonding together a sheet-like waterproof material 11 made of a highly flexible synthetic resin such as EVA resin or synthetic rubber, and a water-permeable sheet-like buffer material 12 such as a nonwoven fabric or a three-dimensional mesh. Furthermore, the waterproof sheet 10 is long enough to continuously cover one side wall, the arch portion, and the other side wall of the tunnel T, and is formed in a roughly rectangular sheet shape with a predetermined width in the tunnel axial direction.

[0027] When laying the waterproof sheet 10, the buffer material 12 of the waterproof sheet 10 is placed on the sprayed concrete 202 side, and the waterproof sheet is laid so as to continuously cover one side wall part, the arch part and the other side wall part of the tunnel T, and multiple waterproof sheets 10 are laid side by side in the tunnel axial direction.

[0028] At the joint 13 between one waterproof sheet 10 and the other waterproof sheet 10 that are laid side by side, the buffer material 12 of one waterproof sheet 10 is overlapped on the buffer material 12 of the other waterproof sheet 10 and fixed by adhesive or welding, and the one waterproof material 11 and the other waterproof material 11 are welded at welded parts 15a, 15b so as to form an unwelded groove 14 in the circumferential direction of the tunnel. The welded parts 15a, 15b are spaced apart in the axial direction of the tunnel and are formed continuously in the circumferential direction of the tunnel, with the unwelded groove 14 being provided between the welded parts 15a and 15b. After the juxtaposition and installation of the one waterproof sheet 10 and the other waterproof sheet 10 are completed, both circumferential ends of the unwelded groove 14 are completely sealed, and the inside of the unwelded groove 14 becomes an enclosed space.

[0029] In addition, when a damage DA occurs in the waterproof sheet 10, a repair patch 16 is provided to cover the damaged DA of the waterproof sheet 10, and the repair patch 16 is fixed to the waterproof sheet 10 around the damaged DA by welding or the like to repair the damaged part.

[0030] When performing a pressure test using the waterproof sheet inspection device 1, as shown in Fig. 7, an attachment hose 811 corresponding to the test needle attachment portion of the test needle 81 for the pressure test is attached to the adapter attachment portion 52 of the connection adapter 5, and at a joint 13 between, for example, one waterproof sheet 10 and another waterproof sheet 10 that are arranged side by side, the test needle 81 is inserted from one end into the non-welded groove 14 whose other end in the circumferential direction is sealed, thereby sealing the periphery of the test needle 81. In addition, the exhaust valve 35 of the positive / negative pressure switching unit 3 is closed, allowing compressed air to be supplied to the air flow pipe portion 51 and the inside of the test needle 81 (see S11 in Fig. 8).

[0031] In the determination device 7, in response to input of the test mode setting for the pressurized test, the test start pressure, and the test time from the input unit 73, the control unit 71 of the determination device 7 stores the test start pressure and the test time in the test start pressure storage unit 722 and the test time storage unit 723, and is in a state where it has the function of controlling the pressurized test process, and further sends a drive start command to the pressure transmitter 6 to drive the pressure transmitter 6 (see S12 in FIG. 8). The test start pressure and the test time can be set to appropriate values ​​as needed, and for example, a test start pressure exceeding atmospheric pressure is set to 0.15 to 0.20 N / mm 2 is set, and the test time is set to 2 minutes.

[0032] The control unit 71 of the determination device 7, which is set to the pressurized inspection mode, sends a start command to the pressurized pump 2 in response to an input from the input unit 73 to start driving the pressurized pump 2, and the pressurized pump 2 outputs compressed air in response to the start command received from the determination device 7, and the compressed air is supplied to the closed space of the non-welded groove 14 via the positive / negative pressure switching unit 3, the air flow pipe unit 51, and the inspection needle 81 (see S13 in Figure 8).

[0033] The pressure transmitter 6 connected to the air flow pipe 51 converts the internal pressure of the air flow pipe 51 into an electrical signal as the internal pressure of the unwelded groove 14 and continuously transmits it to the determination device 7. The control unit 71 of the determination device 7 compares the pressure information received from the pressure transmitter 6 with the test start pressure set and stored in the test start pressure storage unit 722, and if the pressure information received from the pressure transmitter 6 exceeds or reaches the test start pressure, it sends a drive stop command to the pressurizing pump 2 and starts a pressurization test (see S14 in Figure 8). The pressurizing pump 2 stops outputting compressed air in response to the drive stop command received from the determination device 7.

[0034] The control unit 71 of the judgment device 7 that has started the pressure test receives pressure information from the pressure transmitter 6 continuously from the start to the end of the test time, records the chronological pressure information in the pressure information recording unit 724 (see S15 in Figure 8), calculates the pressure change rate, which is the pressure decrease rate of the test end pressure relative to the test start pressure, at the end of the test time (see S16 in Figure 8), compares the calculated pressure change rate with the threshold value stored in the threshold value storage unit 725, and judges the condition of the waterproof sheet 10-10 seams 13 as pass if the pressure change rate is less than or equal to the threshold value, thereby judging whether the installation condition of the waterproof sheet 10 is pass or fail (see S17 in Figure 8). The threshold value to which the pressure change rate calculated in the pressure test is compared can be set as appropriate, and is set to 20%, for example.

[0035] Upon completion of the pressure test, the control unit 71 of the determination device 7 records the test results, such as information on whether the pressure test was successful, in the management recording unit 726 in association with management identification information that can identify the test location. Also, the control unit 71 removes the test needle 81 from the non-welded groove 14, releases the pressure inside the non-welded groove 14, and seals the portion of the non-welded groove 14 from which the test needle 81 was removed (see S18 in FIG. 8).

[0036] Furthermore, when performing a negative pressure test using the waterproof sheet inspection device 1, as shown in Figure 9, a suction hose 82 communicating with the interior of the storage section 831 of the negative pressure inspection tool 83 is attached to the adapter mounting section 52 of the connection adapter 5, and the storage section 831 of the negative pressure inspection tool 83 is placed over the repair patch 16 fixed to the location of the damage DA of the waterproof sheet 10, and the repair patch 16 is surrounded by the sealing section 832 abutting against the waterproof sheet 10. The exhaust valve 35 of the positive / negative pressure switching unit 3 is opened, and the supplied compressed air is discharged from the exhaust valve 35, making it possible to reduce the pressure inside the air circulation pipe section 51 (see S21 in Figure 10).

[0037] Then, in the determination device 7, in response to input of the test mode setting for the negative pressure test, the test start pressure, and the test time from the input unit 73, the control unit 71 of the determination device 7 stores the test start pressure and the test time in the test start pressure storage unit 722 and the test time storage unit 723, and is in a state where it has the function of controlling the negative pressure test process, and further sends a drive start command to the pressure transmitter 6 to drive the pressure transmitter 6 (see S22 in FIG. 10). The test start pressure and the test time can be set to appropriate values ​​as needed; for example, the test start pressure below atmospheric pressure is set to -5 Hgcm, and the test time is set to 10 seconds.

[0038] The control unit 71 of the determination device 7, which has been set to the negative pressure test mode, sends a drive start command to the pressure pump 2 in response to an input from the input unit 73 to start driving the pressure pump 2, and the pressure pump 2 outputs compressed air in response to the drive start command received from the determination device 7, and the compressed air is supplied to the positive / negative pressure switching unit 3. The compressed air supplied to the positive / negative pressure switching unit 3 is exhausted from the exhaust valve 35, and the insides of the air circulation pipe 51, the suction hose 82, and the storage unit 831, which are connected to the positive / negative pressure switching unit 3 having an ejector structure, are each placed under negative pressure (see S23 in FIG. 10).

[0039] The pressure transmitter 6 connected to the air flow pipe 51 converts the internal pressure of the air flow pipe 51 into an electrical signal as the internal pressure of the accommodation section 831 and continuously transmits the signal to the determination device 7. The control unit 71 of the determination device 7 compares the pressure information received from the pressure transmitter 6 with the test start pressure set and stored in the test start pressure storage unit 722, and if the pressure information received from the pressure transmitter 6 is less than the test start pressure or equal to or less than the test start pressure, it sends a drive stop command to the pressurizing pump 2 and starts a negative pressure test (see S24 in FIG. 10 ). The pressurizing pump 2 stops outputting compressed air in response to the drive stop command received from the determination device 7. At the same time as the pressurizing pump 2 stops outputting compressed air, the exhaust valve 35 of the positive / negative pressure switching unit 3 is closed.

[0040] The control unit 71 of the determination device 7 that has started the negative pressure test receives pressure information continuously from the pressure transmitter 6 from the start to the end of the test time, records the chronological pressure information in the pressure information recording unit 724 (see S25 in Figure 10), calculates the pressure change rate, which is the pressure increase rate of the end test pressure relative to the start test pressure of the test time, at the end of the test time (see S26 in Figure 10), compares the calculated pressure change rate with the threshold value stored in the threshold value storage unit 725, and if the pressure change rate is less than or equal to the threshold value, determines that the repair state of the damage DA of the waterproof sheet 10 with the repair patch 16 is acceptable, thereby determining whether the installation state of the waterproof sheet 10 is acceptable (see S27 in Figure 10). The threshold value to which the pressure change rate calculated in the negative pressure test is compared can be set as appropriate.

[0041] Upon completion of the negative pressure test, the control unit 71 of the determination device 7 records the test results, such as information on whether the negative pressure test was successful, in the management recording unit 726 in association with management identification information that can identify the test location. In addition, the storage unit 831 of the negative pressure test tool 83 that was placed on the repair patch 16 is removed from the repair patch 16 (see S28 in FIG. 10).

[0042] According to the waterproof sheet inspection device 1 of this embodiment, by selectively connecting the attachment hose 811 of the inspection needle 81 for pressure testing and the suction hose 82 for negative pressure testing to the adapter mounting portion 52 and switching the internal pressure of the air flow pipe portion 51 between positive and negative pressure in response to switching of the positive / negative pressure switching unit 3, it is possible to perform both pressure testing and negative pressure testing to inspect the installation condition of the waterproof sheet 10 with the same inspection device 1, and to inspect both the condition of the waterproof sheet 10's seams and the condition of damaged or repaired areas of the waterproof sheet 10. This improves the efficiency of the inspection work to inspect the installation condition of the waterproof sheet 10 and reduces inspection costs. Furthermore, the work procedures for pressure testing and negative pressure testing can be largely aligned, reducing inspection errors.

[0043] Furthermore, by comparing the rate of change in the pressure at the end of the test relative to the pressure at the start of the test during the test time with a threshold value to determine whether the installation state of the waterproof sheet 10 has passed or failed, the degree of freedom in the pressure value at the start of the test can be increased, thereby increasing the degree of freedom and flexibility in the inspection work for the installation state of the waterproof sheet 10. Furthermore, the pass / fail judgments for the pressurized test and the negative pressure test can be made using the same rate of change in pressure as a standard, making it easier to understand the evaluation levels of airtightness in the pressurized test and the negative pressure test.

[0044] In addition, by controlling the operation of the pressure pump 2 using a judgment device 7 that is communicatively connected to the pressure pump 2, it becomes possible to control the operation of the pressure pump 2 from a location away from the pressure pump 2, thereby improving the ease and flexibility of the inspection work for the installation status of the waterproof sheet 10.

[0045] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the individual inventions and embodiments listed as inventions, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects are obtained and creating a generic concept.The inventions disclosed in this specification also include the following contents and modifications.

[0046] For example, the waterproof sheet inspected by the waterproof sheet inspection device of the present invention is not limited to the waterproof sheet 10 in the above example, but can be any appropriate sheet within the applicable range, and can also be applied to waterproof sheets other than those laid in places other than the inner perimeter of a tunnel.

[0047] In addition, the waterproof sheet inspection device of the present invention can also determine whether the installation condition of the waterproof sheet is acceptable or not using indicators other than the pressure change rate.For example, a threshold value corresponding to the end-of-test pressure can be stored in the memory unit of the judgment device, and the end-of-test pressure of the pressurized test or the end-of-test pressure of the negative pressure test can be compared with the threshold value to determine whether the installation condition of the waterproof sheet is acceptable or not.

[0048] Furthermore, the air circulation pipe portion and adapter mounting portion in the waterproof sheet inspection device of the present invention can be configured and positioned as appropriate within the scope of the spirit of the present invention, and are not limited to being provided as part of the connection adapter 5 in the above embodiment.

[0049] Furthermore, the positive / negative pressure switching unit corresponding to the positive / negative pressure switching section in the present invention is not limited to the configuration of the positive / negative pressure switching unit 3 in the above embodiment, and may be, for example, a positive / negative pressure switching unit 3a of the modified example shown in Fig. 11. The positive / negative pressure switching unit 3a is also composed of an ejector that switches the flow path of compressed air introduced from the pressure pump 2 to switch the internal pressure of the air flow pipe 51 between positive and negative pressure. Like the positive / negative pressure switching unit 3, the positive / negative pressure switching unit 3a has an air introduction path 31a, a nozzle 32a, a diffuser 33a, and a branch path 34a that communicates near the outlet of the nozzle 32a, but an openable / closable exhaust valve 35a is provided in the flow path between the nozzle 32a and the diffuser 33a.

[0050] Furthermore, the positive / negative pressure switching unit of the present invention can be configured as appropriate as long as it can switch the flow path of compressed air introduced from the pressure pump to switch the internal pressure of the air flow pipe between positive and negative pressures. Configurations other than the positive / negative pressure switching units 3, 3a having exhaust valves 35, 35a can also be used. For example, the positive / negative pressure switching unit 3 in FIG. 1 may be an ejector without a switching function using the exhaust valve 35, a bypass pipe for circulating air from the air hose 4 to the air flow pipe 51, and a switching valve capable of switching the flow path at the connection between the air hose 4 and the bypass pipe. The positive / negative pressure switching unit may be configured with an ejector without a switching function, the bypass pipe, and the switching valve. In this case, during pressurization testing, the flow path on the ejector side is closed with the switching valve, and compressed air is supplied to the air flow pipe 51 through the bypass pipe. During negative pressure testing, the flow path on the bypass pipe side is closed with the switching valve, and compressed air is discharged from the diffuser of the ejector, placing the air flow pipe 51 in a reduced-pressure state. [Industrial Applicability]

[0051] The present invention can be used, for example, when inspecting the installation condition of a waterproof sheet laid in a tunnel. [Explanation of symbols]

[0052] 1...Waterproof sheet inspection device 2...Pressurizing pump 3, 3a...Positive and negative pressure switching unit 31, 31a...Air introduction path 32, 32a...Nozzle 33, 33a...Diffuser 34, 34a...Branch path 35, 35a...Exhaust valve 4...Air hose 5...Connection adapter 51...Air circulation pipe section 52...Adapter mounting section 521...Cylinder body 522...Seal ring 523...Latching claw 524...Release tube 6...Pressure transmitter 7...Determination device 71...Control section 72...Memory section 721...Control program storage section 722...Inspection start pressure storage section 723...Inspection time storage section 724...Pressure information recording section 725...Threshold value storage section 726...Management recording section 73...Input section 74...Display section 75...Communication interface 76...Timer 81...Inspection needle 811...Attachment hose 82...Suction hose 83...Negative pressure test equipment 831...Storage section 832...Sealing section 10...Waterproof sheet 11...Waterproof material 12...Buffer material 13...Joint 14...Non-welded groove 15a, 15b...Welded section 16...Repair patch 201...Natural ground 202...Sprayed concrete T...Tunnel DA...Damage

Claims

1. a pressure pump that outputs compressed air; a positive / negative pressure switching unit that switches the flow path of the compressed air introduced from the pressure pump to switch the internal pressure of the air flow pipe between positive and negative pressure; a pressure transmitter capable of detecting pressure and connected to the air flow pipe; an adapter attachment portion provided on the test location side of the air flow pipe portion, to which a test needle attachment portion of a test needle for a pressure test and a suction hose for a negative pressure test can be selectively attached; a determination device that determines whether the waterproof sheet is installed properly based on the pressure information received from the pressure transmitter; A waterproof sheet inspection device comprising:

2. A waterproof sheet inspection device as described in claim 1, characterized in that the judgment device receives pressure information from the pressure transmitter continuously from the start to the end of the inspection time, calculates the pressure change rate of the end inspection pressure to the start inspection pressure of the inspection time, and compares the pressure change rate with a threshold value to determine whether the installation status of the waterproof sheet is acceptable or not.

3. the pressure pump is communicably connected to the determination device, the pressure pump outputs compressed air in response to a drive start command transmitted from the determination device; 3. The waterproof sheet inspection device according to claim 1, wherein the pressure pump stops outputting compressed air in response to a drive stop command sent from the determination device.

4. 3. The waterproof sheet inspection device according to claim 1, wherein the inspection needle attachment portion is an attachment hose that communicates with the inside of the inspection needle and has approximately the same outer diameter as the suction hose.

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