Air permeance measurement device, method for measuring air permeance, air permeance measurement system

Abstract

To provide an air permeance measurement device which can rapidly evaluate the air permeance of concrete, for example.SOLUTION: An air permeance measurement device (10) includes: an attachment (11) with an opening unit (11b); a cylinder (13) with an inside space (13a) leading to the opening unit (11b); a piston (14) for changing the volume of the inside space (13a); a pressure sensor (16) for detecting the pressure of the inside space (13a); and a first control unit (17). The first control unit (17) calculates the air permeance rate and specifies the air inflow amount corresponding to the air permeance rate.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an air permeability measurement device, an air permeability measurement method, and an air permeability measurement system. [Background technology]

[0002] Patent Document 1 describes an air permeability measuring method that uses a simple air permeability testing device or the like, and that can measure the mass transfer resistance of the surface layer of a porous material.

[0003] Non-Patent Document 1 describes a single-chamber method in which the air permeability index is calculated by reducing the pressure inside a chamber attached to the surface of concrete and then measuring the time it takes for the air pressure inside the chamber to return to normal.

[0004] Non-patent document 2 describes a method in which the lid of a desiccator is placed in close contact with a concrete surface, the inside of the lid is depressurized, and then the time it takes for the degree of vacuum to decrease due to air flowing in from the concrete surface is measured to calculate the air suction rate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-72489 A [Non-patent literature]

[0006] [Non-Patent Document 1] Junji Yamazaki, Keiichi Imamoto, Akio Tanaka, Takeshi Kato, "Study on Repeated Measurements and Calibration of Testing Machines in Air Permeability Tests", Proceedings of the Japan Concrete Institute, Vol. 39, No. 1, 2017, p. 1921-1926 [Non-Patent Document 2] Masae Kunimoto, Noboru Yuasa, Yoshio Kasai, Isamu Matsui, "Proposal of an evaluation method for cold joints in structural concrete", Proceedings of the Architectural Institute of Japan Annual Meeting, 2000, p.433-434 Summary of the Invention [Problem to be solved by the invention]

[0007] One aspect of the present disclosure aims to provide an air permeability measurement device, an air permeability measurement method, and an air permeability measurement system that can evaluate the air permeability of concrete or the like in a short period of time. [Means for solving the problem]

[0008] In order to solve the above problems, an air permeability measuring device according to one embodiment of the present disclosure includes an attachment that is placed on the surface of an object to be measured and has an opening facing the object to be measured, a cylinder that has an internal space communicating with the opening of the attachment and is fixed to the attachment, a piston that changes the volume of the internal space by sliding along the inner circumferential surface of the cylinder, a pressure sensor that detects the pressure of the internal space through the opening of the attachment, and a control unit. The control unit calculates, with the attachment in close contact with the surface of the object to be measured, a pressure difference between a first pressure, which is the pressure in the internal space at a certain time after pressure reduction by applying a tensile force to the piston, and a second pressure, which is the pressure in the internal space after a predetermined measurement time has elapsed from the time when the first pressure is detected, and calculates an air permeability rate, which is an index for evaluating the air permeability of the object to be measured, by dividing the pressure difference by the measurement time, and specifies the air inflow rate corresponding to the air permeability rate by referring to the correlation between the calculated air permeability rate and an air inflow rate, which is the inflow rate of air flowing into the internal space as the internal space is reduced in pressure. Effect of the Invention

[0009] According to one aspect of the present disclosure, the air permeability of concrete and the like can be evaluated in a short period of time. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing a configuration of an air permeability measurement system according to a first embodiment of the present disclosure. [Diagram 2]FIG. 1 is a diagram showing the overall configuration of an air permeability measuring device according to a first embodiment. [Diagram 3] 1 is a flowchart showing a flow of evaluating the air permeability of concrete using the air permeability measuring device according to the first embodiment. [Figure 4] FIG. 2 is a diagram showing how the air permeability of concrete is measured by the air permeability measuring device according to the first embodiment. [Diagram 5] 4 is a graph showing pressure changes in the internal space of the cylinder when the air permeability of concrete is measured by the air permeability measuring device according to the first embodiment. [Figure 6] FIG. 11 is a correlation diagram showing the correlation between air permeation rate and air inflow amount. [Figure 7] 4 is a flowchart showing the flow of an air leak detection process performed by the air permeability measuring device according to the first embodiment. [Figure 8] 4 is a graph showing pressure changes during measurement using an air permeability measuring device when gaskets made of different materials according to the first embodiment are used. [Figure 9] FIG. 11 is a block diagram showing the configuration of an air permeability measuring device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [Embodiment 1] Hereinafter, an air permeability measurement device 10 and an air permeability measurement system 100 according to a first embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 8. Fig. 1 is a block diagram showing the configuration of the air permeability measurement system 100. Fig. 2 is a diagram showing the overall configuration of the air permeability measurement device 10.

[0012] 1, the air permeability measurement system 100 includes an air permeability measurement device 10 and a communication device 20 capable of communicating with the air permeability measurement device 10. The air permeability measurement device 10 is for measuring the air permeability of a surface layer of a measurement object.

[0013] An example of the measurement object is concrete, but the measurement object is not limited to concrete and may be mortar, cement paste, or the like.

[0014] Here, air permeability is a property that indicates the ease with which air can pass through a measurement object. Air permeability is affected by the moisture content of the measurement object, and the higher the moisture content, the lower the air permeability. By measuring the air permeability of the measurement object, it is possible to evaluate the quality of the measurement object, such as the density of the surface layer.

[0015] As shown in Fig. 2, the air permeability measuring device 10 includes an attachment 11, a gasket 12, a cylinder 13, a piston 14, a stopper 15, a pressure sensor 16, and a control device 101. As shown in Fig. 1, the control device 101 includes a first control unit 17, a storage unit 18, and a communication unit 19.

[0016] Attachment 11 is made of, for example, metal, and is a member for arranging cylinder 13. Attachment 11 is arranged in close contact with the surface of the object to be measured via gasket 12.

[0017] 2, the attachment 11 has a contact portion 11a, an opening 11b, a cylindrical portion 11c, a mounting portion 11d, and a communication hole 11e. The contact portion 11a is made of, for example, a circular plate-like member. The contact portion 11a contacts the surface of the object to be measured via a gasket 12.

[0018] The opening 11b is formed on the center side of the contact portion 11a and has, for example, a circular outer shape. When measuring the air permeability of a measurement object using the air permeability measuring device 10, the opening 11b is disposed facing the measurement object. In addition, when the cylinder 13 is fixed to the attachment 11, the opening 11b is configured to communicate with the connection hole 13b of the cylinder 13.

[0019] The cylindrical portion 11c is provided so as to protrude from the contact portion 11a to the opposite side to the object to be measured. A cylinder 13 is disposed in the cylindrical portion 11c. The outer peripheral surface of the cylinder 13 fits into the inner peripheral surface of the cylindrical portion 11c.

[0020] Further, a mounting portion 11d is formed on a part of the outer circumferential surface of the cylindrical portion 11c. The mounting portion 11d has, for example, a triangular prism shape. The pressure sensor 16 and the control device 101 are attached to the mounting portion 11d by screws or the like. The shape of the mounting portion 11d and the location of the mounting portion 11d can be changed as appropriate.

[0021] The mounting portion 11d is provided with a communication hole 11e that communicates with the opening 11b of the attachment 11. The pressure sensor 16 is connected to the communication hole 11e, and communicates with the internal space 13a of the cylinder 13 via the opening 11b and the connection hole 13b.

[0022] The gasket 12 is made of, for example, low-hardness silicon and is configured to be in close contact with the surface of the object to be measured. The gasket 12 is disposed between the surface of the object to be measured and the attachment 11 so as to surround the periphery of the opening 11b of the attachment 11, and seals the gap between the surface of the object to be measured and the opening 11b of the attachment 11.

[0023] The material of the gasket 12 may be any material that can ensure sealing, and may be a gel-like material other than low-hardness silicone. If the attachment 11 itself is configured to be able to adhere well to the surface of the object to be measured, the gasket 12 may be omitted.

[0024] The cylinder 13 is, for example, a cylindrical container. The cylinder 13 has an internal space 13a and a connection hole 13b. The internal space 13a communicates with the opening 11b of the attachment 11 via the connection hole 13b. The cylinder 13 is, for example, a transparent container, and is configured so that the user can visually check the state inside the cylinder 13. Note that a plurality of scales (not shown) are engraved on the outer circumferential surface of the cylinder 13.

[0025] The piston 14 has a piston rod 141, a piston head 142, an engaging protrusion 143, and a handle 144. The piston rod 141 is a rod-shaped member, and is arranged so as to be able to reciprocate along the longitudinal direction of the cylinder 13 (the up-down direction in FIG. 2).

[0026] A piston head 142 is provided on the end of the piston rod 141 on the attachment 11 side. The piston head 142 is a cylindrical member made of rubber, for example. The piston head 142 is fitted inside the cylinder 13.

[0027] The piston head 142 is disposed so as to be able to slide on the inner circumferential surface 130 of the cylinder 13 along the longitudinal direction of the cylinder 13. When the piston head 142 slides on the inner circumferential surface 130 of the cylinder 13, the volume of the internal space 13a of the cylinder 13 changes.

[0028] An engagement protrusion 143 is provided on the piston head 142 side of the piston rod 141. The engagement protrusion 143 protrudes on both sides in the radial direction (the left-right direction in FIG. 2) of the cylinder 13. The engagement protrusion 143 engages with an engagement portion 15b of the stopper 15 described later.

[0029] A handle 144 is provided on the end of the piston rod 141 opposite to the piston head 142. The handle 144 is a member that is gripped by a user of the air permeability measuring device 10 to move the piston 14 when the user operates the piston 14.

[0030] A stopper 15 is provided at the end of the cylinder 13 opposite to the attachment 11. The stopper 15 is a member for restricting the movement of the piston 14. The stopper 15 has a hole portion 15a and an engagement portion 15b.

[0031] Hole 15a is a hole for allowing piston rod 141 and engaging protrusion 143 to pass through. Engaging portion 15b engages with engaging protrusion 143 that has passed through hole 15a. By engaging engaging protrusion 143 with engaging portion 15b, the position of piston head 142 in the longitudinal direction of cylinder 13 is restricted, and piston 14 can be maintained in a stopped state.

[0032] The pressure sensor 16 is, for example, a digital pressure gauge. The pressure sensor 16 is capable of detecting pressure in the range of, for example, -100 to 100 [kPa]. The pressure sensor 16 has a display unit 16a. The pressure value detected by the pressure sensor 16 is displayed on the display unit 16a.

[0033] The pressure sensor 16 is attached to the mounting portion 11d of the attachment 11 and connected to the communication hole 11e. The pressure sensor 16 detects the pressure in the internal space 13a of the cylinder 13 via the communication hole 11e and the opening 11b. The pressure sensor 16 displays the detected pressure value of the internal space 13a on the display portion 16a. The pressure sensor 16 also outputs a signal corresponding to the detected pressure value of the internal space 13a to the first control portion 17 (see FIG. 1).

[0034] 1, a first control unit 17 of the control device 101 controls the air permeability measuring device 10. The first control unit 17 is an example of a control unit. The first control unit 17 is composed of a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), etc.

[0035] The first control unit 17 calculates the air permeability rate and specifies the amount of air inflow corresponding to the calculated air permeability rate. Here, the air permeability rate is an index for evaluating the air permeability of the measurement object. The amount of air inflow is the amount of air that flows from the measurement object into the internal space 13a of the cylinder 13 due to the pressure difference when the internal space 13a of the cylinder 13 is depressurized with the attachment 11 in close contact with the surface of the measurement object.

[0036] In addition, the first control unit 17 determines whether or not there is air leakage in the attachment 11. The first control unit 17 transmits information relating to the air permeability rate, the amount of air inflow, and the presence or absence of air leakage, etc., to the transceiver unit 23 of the communication device 20 via the communication unit 19.

[0037] The storage unit 18 is, for example, an auxiliary storage device such as a hard disk drive, etc. The storage unit 18 stores, for example, data relating to the correlation between the air permeation rate and the amount of air inflow.

[0038] The communication unit 19 communicates with the transmission / reception unit 23 of the communication device 20. For example, Bluetooth (registered trademark) can be used as a communication method between the communication unit 19 and the transmission / reception unit 23. Note that other communication methods such as Wi-Fi (registered trademark) may also be used.

[0039] The communication unit 19 transmits data to the communication device 20 for displaying information relating to the pressure in the internal space 13a of the cylinder 13 detected by the pressure sensor 16, the air permeability rate calculated by the first control unit 17, and the air inflow rate determined by the first control unit 17.

[0040] The communication device 20 is, for example, a mobile terminal such as a smartphone, and is a device capable of communicating with the air permeability measuring device 10. The user is assumed to have installed in advance an application dedicated to pressure measurement in the communication device 20. Note that the communication device 20 is not limited to a mobile terminal, and may be a personal computer, a tablet terminal, or the like.

[0041] The communication device 20 has a second control unit 21, a second display unit 22, and a transmission / reception unit 23. The second control unit 21 is composed of a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), etc. The second control unit 21 is an example of a control unit. The second display unit 22 displays information transmitted from the communication unit 19 of the air permeability measuring device 10.

[0042] For example, the second display unit 22 displays information on the air permeability rate calculated by the first control unit 17, information on the air inflow amount specified by the first control unit 17, etc. Note that the second display unit 22 may display information on the pressure detected by the pressure sensor 16.

[0043] [Air permeability measurement method] Next, an air permeability measuring method using the air permeability measuring device 10 will be described with reference to Figs. 3 to 6. Fig. 3 is a flow chart showing the flow of evaluating the air permeability of a measurement object using the air permeability measuring device 10. Fig. 4 is a diagram showing the measurement of the air permeability of concrete C using the air permeability measuring device 10. In the following, the description will continue using the concrete C shown in Fig. 4 as an example of the measurement object described above. The concrete C is used for bridge piers and the like.

[0044] In the air permeability measurement method using the air permeability measurement device 10, a placement process (S1), a depressurization process (S2), a standby start process (S3), a first measurement process (S4), a second measurement process (S5), a calculation process (S6), an identification process (S7), a display process (S8), and a standby end process (S9) are performed in this order.

[0045] First, a user of the air permeability measuring device 10 connects the pressure sensor 16 to the mounting portion 11d of the attachment 11. Then, the user operates the communication device 20 to start up an application dedicated to pressure measurement. Hereinafter, this application is referred to as "pressure measurement application A."

[0046] Next, in the placement step (S1), the user places the attachment 11 in close contact with the surface of the concrete C by bringing the abutment portion 11a of the attachment 11 into contact with the surface of the concrete C, as shown in FIG. 4, via the gasket 12.

[0047] After the placement step (S1), the user operates the communication device 20 to start measurement in the pressure measurement application A. When the measurement start is executed in the pressure measurement application A, the pressure sensor 16 starts detecting the pressure in the internal space 13a of the cylinder 13 and starts counting the elapsed time.

[0048] Before starting measurement in the pressure measurement application A, the type, material, size, and use of the measurement object may be recorded in a database (not shown) via the pressure measurement application A. This makes it possible to easily manage data of measurements made by the air permeability measurement device 10.

[0049] Next, in the decompression step (S2), the user grips the handle 144 and applies a tensile force to the piston head 142 on the side opposite to the surface of the concrete C (the right side in FIG. 4), moving the piston 14 relatively to the cylinder 13. This increases the volume of the internal space 13a of the cylinder 13, and reduces the pressure in the internal space 13a according to Boyle's law.

[0050] After the decompression step (S2), the user passes the engaging protrusion 143 of the piston 14 through the hole portion 15a of the stopper 15, and then rotates the handle 144 around the axis of the piston rod 141 to engage the engaging protrusion 143 with the engaging portion 15b, thereby fixing the position of the piston 14.

[0051] Then, the user performs a standby start step (S3) in which the user waits for a predetermined time with the piston 14 fixed in a predetermined position. The predetermined time is, for example, 60 seconds (see FIG. 5). The display unit 16a may be configured to display the elapsed time from the start of measurement of the air permeability of the concrete C by the air permeability measuring device 10.

[0052] Fig. 5 is a graph showing pressure changes in the internal space 13a of the cylinder 13 when the air permeability of the concrete C is measured by the air permeability measuring device 10. As shown in Fig. 5, after the depressurization step (S2), the pressure in the internal space 13a of the cylinder 13 is reduced to -90 [kPa], and as air flows into the internal space 13a from the concrete C, the pressure is restored to -70 [kPa].

[0053] After the standby start step (S3), in a first measurement step (S4), a first pressure P1, which is the pressure in the internal space 13a of the cylinder 13 at time t1, is detected by the pressure sensor 16. As shown in Fig. 5, the first pressure P1 at time t1 is -86 [kPa].

[0054] After the first measurement step (S4), in the second measurement step (S5), a second pressure P2, which is the pressure in the internal space 13a at a time t2 when a predetermined measurement time T has elapsed since the first measurement step (S4) was performed, is detected by the pressure sensor 16. The measurement time T is, for example, 30 seconds. As shown in FIG. 5, the second pressure P2 is −77 [kPa].

[0055] After the second measurement step (S5), in the calculation step (S6), the first control unit 17 calculates the air permeation rate by dividing the pressure difference ΔP obtained by subtracting the first pressure P1 from the second pressure P2 by the measurement time T. The air permeation rate is {-77-(-86)} / 30=0.30 [kPa / s].

[0056] Next, in a determination step (S7), the first control unit 17 refers to the air permeability rate calculated in the calculation step (S6) and the correlation stored in the memory unit 18, thereby determining the air inflow rate corresponding to the calculated air permeability rate.

[0057] Here, the correlation stored in the storage unit 18 will be described. FIG. 6 is a diagram showing the correlation between the air permeability rate and the amount of air inflow stored in the storage unit 18. The example shown in FIG. 6 shows the results of an experiment in which the reduced pressure state is maintained for 30 seconds to measure the air permeability rate and the amount of air inflow, carried out under a plurality of conditions. The plurality of conditions includes the water-cement ratio W / C, the fine aggregate ratio s / a, the amount of AE material, and the like. Note that the correlation may be obtained when the pressure is reduced for, for example, 10 seconds, instead of 30 seconds. Also, the object to be measured in the experiment in FIG. 6 is not limited to concrete, and may be of any material, such as mortar. However, the data is limited to the area in which the pressure change shown in FIG. 5 is linear (the range of t1 to t3 in FIG. 5).

[0058] The air permeation rate is the air permeation rate when the piston 14 is fixed in a predetermined position and maintained for 30 seconds. The air inflow rate is the air inflow rate when the reduced pressure state is maintained for 30 seconds, read from the scale on the cylinder 13.

[0059] As shown in Figure 6, the coefficient of determination R 2 = 0.985, which shows that there is a strong correlation between the air permeation rate and the amount of air inflow. This makes it possible to measure the amount of air inflow from the air permeation rate without reading the scale on the cylinder 13.

[0060] When an approximation line is obtained from the correlation in FIG. 6, the relational expression y=61.1x+0.166 is obtained. Hereinafter, this relational expression is referred to as "relational expression X". Here, y represents the air inflow amount, and x represents the air permeation rate. It is assumed that the relational expression X representing the correlation in FIG. 6 is stored in the memory unit 18. Thereby, when the air permeation rate is calculated, the air inflow amount is uniquely specified by inputting the calculated air permeation rate into x of the relational expression X.

[0061] Returning to the description of the air permeability measuring method using the air permeability measuring device 10, the air permeability rate was calculated to be 0.30 [kPa / s] in the calculation step S6, so the air inflow rate is specified as y=61.1×0.30+0.166=18.5 [ml]. In this way, the first control unit 17 refers to the relational expression X to specify the air inflow rate corresponding to the calculated air permeability rate (S7: specification step).

[0062] Conventionally, when determining the amount of inflowing air, it was necessary to read the amount of inflowing air in the internal space 13a of the cylinder 13 when the pressure was restored. This reading of the amount of inflowing air is performed by visually checking the scale engraved on the cylinder 13. For this reason, in order to reduce reading errors, it is preferable that the amount of inflowing air is large when the pressure is reduced. In other words, it is preferable that the period between the time of the reduction in pressure and the time of the recovery in pressure is as long as possible.

[0063] In contrast, according to the air permeability measuring device 10 of this embodiment, the first pressure P1 and the second pressure P2 are detected by the pressure sensor 16, and therefore, even if the difference between the first pressure P1 and the second pressure P2 is small, the detection error of each pressure is significantly smaller than that of the above-mentioned visual reading of the air inflow amount, although this depends on the accuracy of the pressure sensor 16. In other words, the time between the detection of the first pressure P1 and the detection of the second pressure P2 can be shortened.

[0064] After the identification step (S7), the communication unit 19 transmits to the transceiver unit 23 of the communication device 20 the first pressure P1 detected by the pressure sensor 16 in the first measurement step (S4), the second pressure P2 detected by the pressure sensor 16 in the second measurement step (S5), the air permeability rate calculated by the first control unit 17 in the calculation step (S6), and the air inflow amount identified by the first control unit 17.

[0065] Next, in a display step (S8), the first pressure P1 and the second pressure P2 are displayed on the display unit 16a of the pressure sensor 16. In addition, the air permeability rate and the amount of air inflow are displayed on the second display unit 22. Note that the second display unit 22 may display only either the air permeability rate or the amount of air inflow. By checking the air permeability rate or the amount of air inflow displayed on the second display unit 22, the user can evaluate the air permeability of the concrete C.

[0066] After the display step (S8), in a standby end step (S9), the user operates the handle 144 to disengage the engaging protrusion 143 of the piston 14 from the engaging portion 15b of the stopper 15, thereby releasing the pulling force on the piston 14.

[0067] As a result, the piston 14 moves toward the concrete C, and the volume of the internal space 13a of the cylinder 13 decreases, causing the pressure in the internal space 13a to increase according to Boyle's Law, and then recovers as shown by the pressure change after time t3 in Figure 5.

[0068] After the standby end step (S9), the user operates the communication device 20 to stop the measurement in the pressure measurement application A. When the measurement stop is executed in the pressure measurement application A, the detection of the pressure in the internal space 13a by the pressure sensor 16 is stopped, and the counting of the elapsed time is stopped.

[0069] Before the measurement is stopped in the pressure measurement application A, the measurement results such as the air permeability rate and the amount of air inflow may be recorded in a database (not shown) via the pressure measurement application A. This makes it possible to manage the measurement results by the air permeability measuring device 10.

[0070] In this embodiment, between S3 to S9 in Fig. 3, the first control unit 17 concurrently determines whether or not there is air leakage in the attachment 11. Here, Fig. 7 is a flowchart showing the flow of the air leakage detection process by the air permeability measuring device 10.

[0071] 7, the first control unit 17 determines whether the calculated air permeation rate is equal to or higher than a predetermined threshold (S11). If the air permeation rate is equal to or higher than the threshold (S11: YES), the first control unit 17 determines that there is an air leak near the attachment 11.

[0072] Here, Fig. 8 is a graph showing pressure changes during measurement by the air permeability measuring device 10 when gaskets 12 made of different materials are used. In Fig. 8, silicon A, silicon B, silicon C, and silicon D show cases in which high-hardness silicon is used as the material for the gasket 12. Each high-hardness silicon has a different hardness, thickness, etc.

[0073] Low hardness A, low hardness B, low hardness C, and low hardness D indicate cases where low hardness silicone is used as the material for the gasket 12. Each low hardness silicone has a different hardness, thickness, etc. Gel A, gel B, gel C, and gel D indicate cases where a gasket 12 made of urethane gel is used. Each urethane gel has a different hardness, thickness, etc.

[0074] As shown in FIG. 8, when (1) silicone A to D, low hardness D, and gel D were used as the material of the gasket 12, it was found that the pressure rose sharply immediately after the start of the measurement, and air leak occurred near the attachment 11.

[0075] On the other hand, when (2) Low hardness C and Gel C were used as the material of the gasket 12, the pressure recovery was completed in about 40 seconds. In contrast, when (3) Low hardness A, Low hardness B, Gel A, and Gel B were used as the material of the gasket 12, the reduced pressure state could be maintained for about 60 seconds.

[0076] As in the case of (1) above, when the pressure in the internal space 13a of the cylinder 13 rises suddenly, the air permeation rate obtained by dividing the pressure change by the measurement time becomes equal to or greater than a threshold value. When the air permeation rate becomes equal to or greater than the threshold value (S11: YES), the first control unit 17 transmits an error signal to the transmitting / receiving unit 23 of the communication device 20 via the communication unit 19.

[0077] When the error signal is received by the transmitting / receiving unit 23, the second control unit 21 causes the second display unit 22 to display a predetermined error display (S12). By confirming that an error is displayed on the second display unit 22, the user can quickly understand that air is leaking from around the contact portion 11a of the attachment 11, etc. This allows the user to redo the measurement using the air permeability measuring device 10.

[0078] [Advantages of the First Embodiment] According to the air permeability measuring device 10 described above, the first control unit 17 can calculate the air permeability rate by dividing the pressure difference ΔP between the first pressure P1 detected by the pressure sensor 16 in the first measurement step (S4) and the second pressure P2 detected by the pressure sensor 16 in the second measurement step (S5) by the measurement time T (S6: calculation step).

[0079] Then, the first control unit 17 can determine the amount of air inflow by referring to data regarding the correlation between the air permeability rate and the amount of air inflow stored in the memory unit 18, and the air permeability of the concrete C, which is the object to be measured, can be evaluated.

[0080] On the other hand, with conventional air permeability measuring devices, the inside of the cylinder is decompressed and then the amount of air that has flowed into the cylinder is determined by reading the marks on the cylinder after waiting a specified period of time (e.g., 60 seconds).

[0081] In contrast, with the air permeability measuring device 10, after the second measurement step (S5), the amount of air inflow corresponding to the calculated air permeability rate can be immediately determined by referring to correlation data pre-stored in the memory unit 18 without reading the scale on the cylinder 13. This means that the measurement time with the air permeability measuring device 10 can be reduced to about half of the conventional time (about 30 seconds), and the air permeability of the concrete C can be evaluated in a short period of time.

[0082] In addition, in a display step (S8), the first control unit 17 displays the first pressure P1 detected in the first measurement step (S4) and the second pressure P2 detected in the second measurement step (S5) on the display unit 16a. Furthermore, the second display unit 22 of the communication device 20 displays the air permeability rate calculated in the calculation step (S6) and the inflow air volume identified in the identification step (S7). This allows the user to quickly grasp the inflow air volume by visually checking the second display unit 22 of the communication device 20, without having to read the scale on the cylinder 13.

[0083] Furthermore, since the air permeability measuring device 10 is not a device that reduces pressure using a vacuum pump or the like, it does not require a power source to drive a vacuum pump or the like, and can evaluate the air permeability of the surface layer of concrete C with an inexpensive and simple configuration.

[0084] Furthermore, in the placement step (S1), the attachment 11 can be placed in intimate contact with the surface of the concrete C, which is the object to be measured, via the gasket 12, so that the air permeability of the concrete C can be evaluated well using the air permeability measuring device 10.

[0085] In addition, the pressure sensor 16 is attached to the mounting portion 11d of the attachment 11 and connected to a communication hole 11e that communicates with the internal space 13a of the cylinder 13 and the opening 11b of the attachment 11, so that the pressure sensor 16 can be stably positioned to accurately detect the pressure in the internal space 13a of the cylinder 13.

[0086] Moreover, since data on the correlation between the air permeability rate and the air inflow rate is pre-stored in the memory unit 18, after the air permeability rate is calculated by the first control unit 17, the air inflow rate corresponding to the calculated air permeability rate can be quickly identified by referring to the above data.

[0087] 3, the first control unit 17 determines in parallel whether or not there is an air leak in the attachment 11, and if the air permeability rate is equal to or greater than a predetermined threshold (S11: YES), it determines that there is an air leak, and an error message is displayed on the second display unit 22 (S12). After confirming the error message, the user can restart the air permeability measurement by the air permeability measuring device 10 from the placement step (S1), thereby making it possible to properly evaluate the air permeability of the measurement object.

[0088] Furthermore, since the first measuring step (S4) and the second measuring step (S5) are performed before the standby end step (S9), the measurement time T can be shortened.

[0089] The communication section 19 of the air permeability measuring device 10 transmits information relating to the pressure in the internal space 13a of the cylinder 13 detected by the pressure sensor 16, the air permeability rate calculated by the first control section 17, and the amount of inflowing air specified by the first control section 17 to the transceiver section 23 of the communication device 20. The second display section 22 displays each piece of information transmitted from the communication section 19. This allows the user to quickly grasp the measurement results by visually checking the second display section 22 of the communication device 20.

[0090] [Embodiment 2] Next, a second embodiment of the present disclosure will be described with reference to Fig. 9. For ease of explanation, the same reference numerals are used for members having the same functions as those described in the first embodiment, and the explanations thereof will not be repeated. Fig. 9 is a block diagram showing the configuration of an air permeability measuring device 10A according to the second embodiment.

[0091] 9, the air permeability measurement device 10A includes a pressure sensor 16, a control device 101A, and a first display unit 102. The control device 101A has a first control unit 17 and a storage unit 18. In the second embodiment, instead of displaying the air permeability rate and the air inflow rate on the second display unit 22 of the communication device 20, the air permeability rate and the air inflow rate are displayed on the first display unit 102 of the air permeability measurement device 10A.

[0092] The air permeability measuring device 10A includes an attachment 11, a gasket 12, a cylinder 13, a piston 14, and a stopper 15, similar to the air permeability measuring device 10 of the first embodiment (see FIG. 2). Note that the air permeability measuring device 10A is not configured to be able to communicate with the communication device 20.

[0093] The first display unit 102 is a display dedicated to displaying the measurement results by the air permeability measuring device 10A, separate from the pressure sensor 16. The first display unit 102 is configured by a liquid crystal display (LCD; Liquid Crystal Display), an organic EL (Electro-Luminescence) display, or the like.

[0094] The first display unit 102 is connected to the first control unit 17 via wired communication or wireless communication. The first display unit 102 displays the air permeation rate and the amount of air inflow calculated by the first control unit 17. Note that a plurality of first display units 102 may be installed.

[0095] The air permeability measurement device 10A of the embodiment 2 described above can also provide the same effects as the air permeability measurement device 10 of the embodiment 1. In particular, even if the user does not carry the communication device 20, the user can evaluate the air permeability of the concrete C in a short period of time by visually checking the first display unit 102.

[0096] Other embodiments In the air permeability measuring device 10 of the above-mentioned embodiment 1, the air permeability rate and the air inflow rate are displayed on the second display section 22 of the communication device 20, but this is not limited to this. The air permeability measuring device 10 may be provided with a first display section separate from the pressure sensor 16, and the air permeability rate and the air inflow rate may be displayed on both the first display section and the second display section 22.

[0097] In the above-described first and second embodiments, the method of fixing the piston 14 is such that the engaging protrusion 143 of the piston rod 141 is engaged with the hole 15a of the stopper 15, but is not limited thereto. For example, a recess may be provided in the piston rod 141 and a protrusion may be provided in the stopper 15, and the protrusion of the stopper 15 may be engaged with the recess of the piston rod 141.

[0098] In the above-described first and second embodiments, the user operates the handle 144 to move the piston 14 relative to the cylinder 13, but this is not limiting. For example, the air permeability measuring device 10 may be provided with an actuator that moves the handle 144 along the longitudinal direction of the cylinder 13. In this case, the communication device 20 controls the first control unit 17 via the communication unit 19 to remotely operate the actuator to move the piston 14 relative to the cylinder 13.

[0099] In the above-mentioned first embodiment, the first control unit 17 calculates the air permeability rate and specifies the amount of air inflow corresponding to the calculated air permeability rate, but this is not limited to the above. For example, the pressure value detected by the pressure sensor 16 may be transmitted to the communication device 20 via the communication unit 19, and the second control unit 21 of the communication device 20 may calculate the air permeability rate and specify the amount of air inflow. The second display unit 22 displays the air permeability rate calculated by the second control unit 21 and the amount of air inflow specified by the second control unit 21.

[0100] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. [Explanation of symbols]

[0101] 10. Air permeability measuring device 10A Air Permeability Measuring Device 11 Attachment 11a Contact part 11b opening 11e Communication hole 12 Gasket 13 Cylinder 13a Interior space 14 Piston 16 Pressure Sensor 17 First Control Section 18 Memory section 19 Communications Department 20. Communications Equipment 21 Second Control Section 22 2nd display section 100 Air Permeability Measurement System 102 1st display section

Claims

1. an attachment that is placed on a surface of a measurement object and has an opening facing the measurement object; a cylinder having an internal space communicating with the opening of the attachment and fixed to the attachment; a piston that changes the volume of the internal space by sliding along an inner circumferential surface of the cylinder; a pressure sensor that detects a pressure in the internal space through the opening of the attachment; A control unit; Equipped with The control unit is With the attachment in close contact with the surface of the object to be measured, a pressure difference is calculated between a first pressure, which is the pressure in the internal space at a certain time after a tensile force is applied to the piston to reduce the pressure, and a second pressure, which is the pressure in the internal space after a predetermined measurement time has elapsed since the first pressure was detected, and the pressure difference is divided by the measurement time to calculate an air permeability rate, which is an index for evaluating the air permeability of the object to be measured; By referring to the correlation between the calculated air permeability rate and an air inflow rate, which is an inflow rate of air flowing into the internal space due to the pressure reduction of the internal space, the air inflow rate corresponding to the air permeability rate is specified. An air permeability measuring device.

2. The air permeability measuring device according to claim 1, further comprising a first display unit that displays information regarding at least one of the pressure of the internal space detected by the pressure sensor, the air permeability rate calculated by the control unit, and the air inflow amount specified by the control unit.

3. A gasket is disposed between the surface of the object to be measured and the attachment, and is in close contact with the surface of the object to be measured.

2. The air permeability measuring device according to claim 1, wherein the attachment is disposed in close contact with the surface of the object to be measured via the gasket.

4. the attachment has a communication hole in an outer circumferential surface thereof that communicates with the opening, 2. The air permeability measuring device according to claim 1, wherein the pressure sensor is connected to the communication hole of the attachment.

5. 2. The air permeability measuring device according to claim 1, further comprising a storage unit in which data relating to the correlation is stored.

6. A communication unit that transmits information regarding at least one of the pressure in the internal space detected by the pressure sensor, the air permeability rate, and the air inflow rate to a communication device, The air permeability measuring device according to claim 1 , wherein the communication unit transmits data for causing the communication device to display the information to the communication device.

7. The control unit further includes:

2. The air permeability measuring device according to claim 1, wherein, when the calculated air permeability rate is equal to or greater than a predetermined threshold value, it is determined that there is an air leak.

8. An air permeability measuring method using the air permeability measuring device according to any one of claims 1 to 7, a placement step of placing the attachment on a surface of the object to be measured; a decompression step of decompressing the internal space of the cylinder by applying the tensile force to the piston to slide the piston; a standby start step of starting to wait in a state in which the piston is fixed at a predetermined position after the depressurization step is performed; a first measurement step of detecting a first pressure, which is a pressure in the internal space at a certain time after the standby start step, by the pressure sensor; a second measurement step of detecting, by the pressure sensor, a second pressure which is the pressure in the internal space when the measurement time has elapsed since the first measurement step is performed, after the standby start step; A calculation step of calculating the air permeability rate by dividing the pressure difference, which is the difference between the second pressure and the first pressure, by the measurement time by the control unit; A step of determining an air inflow amount corresponding to the air permeability rate by referring to a correlation between the air permeability rate calculated by the control unit and an air inflow amount, which is an inflow amount of air flowing into the internal space as the internal space is decompressed; A method for measuring air permeability comprising the steps of:

9. The air permeability measurement method according to claim 8, further comprising a display step of displaying information on at least one of the pressures detected in the first measurement step and the second measurement step, the air permeability rate calculated in the calculation step, and the air inflow amount identified in the identification step on a first display unit.

10. The method further includes a standby end step of releasing the fixation of the piston after the standby start step, 9. The air permeability measuring method according to claim 8, wherein the first measuring step and the second measuring step are performed before the standby end step.

11. An air permeability measuring device according to any one of claims 1 to 7, A communication device capable of communicating with the air permeability measuring device; Equipped with The air permeability measurement device further includes a communication unit that transmits information regarding at least one of the pressure of the internal space detected by the pressure sensor, the air permeability rate calculated by the control unit, and the air inflow amount specified by the control unit to the communication device; The air permeability measuring system according to claim 1, wherein the communication device has a second display unit that displays the information transmitted from the communication unit.

12. an attachment that is placed on a surface of a measurement object and has an opening facing the measurement object; a cylinder having an internal space communicating with the opening of the attachment and fixed to the attachment; a piston that changes the volume of the internal space by sliding along an inner circumferential surface of the cylinder; a pressure sensor that detects a pressure in the internal space through the opening of the attachment; An air permeability measuring device comprising: A communication device capable of communicating with the air permeability measuring device; Equipped with The air permeability measurement device further includes a communication unit that transmits information regarding the pressure of the internal space detected by the pressure sensor to the communication device, The communication device includes: A control unit; A second display unit; having The control unit is calculating a pressure difference between a first pressure, which is the pressure in the internal space at a certain time after a tensile force is applied to the piston to reduce the pressure, in a state in which the attachment is in close contact with the surface of the object to be measured, and a second pressure, which is the pressure in the internal space after a predetermined measurement time has elapsed since the first pressure was detected; The pressure difference is divided by the measurement time to calculate an air permeability rate, which is an index for evaluating the air permeability of the measurement object, and the air inflow rate, which is the inflow rate of air flowing into the internal space as the internal space is depressurized, is referenced to identify the air inflow rate corresponding to the air permeability rate. The second display unit displays information regarding the air permeability rate calculated by the control unit and the air inflow amount specified by the control unit. An air permeability measurement system.

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