JP6774100B2 - Sensor for detecting concrete filling and measuring changes in moisture over time - Google Patents

Description

The present invention relates to a sensor for detecting concrete filling and measuring changes in moisture over time. Specifically, the present invention describes the state of filling or cracking of filled concrete from the inside of the surface of a concrete structure to a certain range of depth. Furthermore, it is possible to easily, quickly, and accurately detect the change in moisture content of the filled concrete over time, which is extremely useful for evaluating the durability of concrete buildings, etc., and is configured so that it can be easily measured and operated. It relates to a sensor for filling detection and measurement of changes in moisture over time.

Conventionally, concrete has been indispensable for use in buildings such as buildings and foundations of houses in the field of modern architecture.

Filling the formwork with concrete is indispensable when constructing a new building, and it is extremely important for quality control of construction to know whether the formwork is filled correctly.

Further, conventionally, in the maintenance of an existing building, the durability of the building is evaluated by the compression strength by a method such as "tapping sound inspection" or "core removal" and the neutralization depth.

In particular, since the moisture in concrete affects the neutralization rate, it indirectly affects the durability, and it is also related to the measurement of cracks and air permeability coefficient, so it is suitable for durability evaluation over time. It is useful to use moisture measurement together.

In order to more accurately grasp the durability and life of a building, for example, the filling state, moisture state, and moisture value inclination state of concrete on a concrete wall surface, etc. should be measured and observed over time from the time of casting to the post-casting. Is strongly requested.

Patent Document 1 describes an electrode portion composed of a pair of electrodes in which electrode surfaces are arranged substantially in parallel with the wall surface so as not to protrude from the wall surface of a structure in contact with the detection object toward the detection object side, and the electrode portion. A capacitor region composed of a pair of electrodes is used as a detection region, and a capacitance detection circuit that detects a capacitance value determined by the amount of water existing in the detection region and a detected capacitance output from the capacitance detection circuit. A capacitive water content sensor including an output unit that outputs an amount of electricity corresponding to a capacitance value is disclosed.

However, in the case of the capacitance type moisture content sensor of Patent Document 1, the electrode surface is arranged substantially in parallel with the wall surface so that the electrode portion does not substantially protrude toward the detection object from the wall surface of the structure in contact with the detection object. The capacitor region composed of the pair of electrodes of the electrode portion is used as the water content detection region. Therefore, the capacitor region is formed only in the vicinity of the wall surface of the structure, and therefore the water content. It is presumed that the quantity detection region cannot be formed.

Japanese Unexamined Patent Publication No. 2001-21518

The present invention has been developed in view of the above-mentioned conventional circumstances, and the filling detection of concrete from the concrete surface to a certain depth within a certain range as well as the inner vicinity region of the surface of the concrete structure. It is possible to easily, quickly, and accurately detect changes in water and moisture over time, which is extremely useful for evaluating the durability of concrete buildings, etc., and is configured so that it can be easily measured and operated. It provides a sensor for change measurement.

The sensor for detecting concrete filling and measuring changes in moisture with time of the present invention includes a plurality of pipe metal portions arranged at a predetermined pitch while sandwiching an insulating portion from the outer circumference to the inner circumference, and the plurality of sensors are provided in the concrete structure to be measured. A cylinder that embeds the metal part region of the pipe and forms a capacitor region with capacitance corresponding to the state of filling concrete or the state of aging of water content of concrete around the plurality of metal parts of pipe based on the measurement signal. A pipe having a shape and a plurality of sensor electrodes formed so as to be inserted into the pipe, and having a plurality of sensor electrodes having the same pitch as the metal portion of the pipe and a smaller number than the metal portion of the pipe are provided on the outer peripheral portion of the pipe. A plurality of sensor electrodes are individually brought into contact with a plurality of corresponding pipe metal parts in a state of being inserted at an arbitrary depth, and measurement signals are supplied from the plurality of sensor electrodes to the corresponding pipe metal parts, and the capacitor is provided. It has a rod-shaped sensor body that detects and outputs a detection signal according to the capacitance of the region, and the state of filling concrete in the region around the sensor electrode insertion position of the sensor body by the detection signal detected by the sensor body. Alternatively, the most important feature is that it is possible to measure the water content of concrete according to changes in water content over time.

According to the invention of claim 1, based on a simplified configuration consisting of a combination of a set of pipes and a sensor body, a filled concrete from the inside of the surface of the concrete structure to a certain range of depth. It is possible to easily, quickly and accurately detect the state of filling or not, cracks, and the state of changes in the water content of the filled concrete over time, which is very useful for evaluating the durability of concrete buildings, etc., and is a simple measurement operation. It is possible to realize and provide a sensor for detecting concrete filling and measuring changes in moisture over time.

According to the invention according to claim 2, the invention is based on a simplified configuration consisting of a set consisting of a pipe having three or more pipe metal portions and a sensor body having three sensor electrodes. Similar to the invention described in 1, the state of filling or cracking of the filled concrete from the inside of the surface of the concrete structure to the region extending to a certain depth, and the state of the water content of the filled concrete changing with time can be easily and quickly checked. In addition, it is possible to realize and provide a sensor for concrete filling detection and moisture change measurement that can be detected accurately, is very useful for evaluating the durability of concrete buildings, etc., and can be easily measured and operated. it can.

According to the invention of claim 3, the outer peripheral portion of the sensor body according to claim 1 or 2 is provided with a scale portion as a guideline for the insertion depth of the sensor electrode into the concrete structure. For detecting concrete filling and measuring changes in moisture with time according to claim 1 or 2, which makes it easy to specify the depth of the detection area such as the presence / absence of concrete filling and contributes to improving the accuracy of durability evaluation of concrete buildings, etc. A sensor can be realized and provided.

According to the invention of claim 4, when the pipe is inserted into the concrete structure, the scale serves as a guideline for the insertion depth of the pipe into the concrete structure at the outer peripheral portion of the pipe according to claim 3. In such a state, if a sensor body having a scale portion on the outer periphery is inserted into the pipe and it is desired to detect an arbitrary position in the concrete structure, each scale of the pipe and the sensor body is provided. By subtracting the portion, it becomes easier to specify the depth of the detection area at an arbitrary position such as the presence / absence of concrete filling, and the accuracy of the durability evaluation of the concrete building or the like can be further improved. The concrete filling detection / moisture change measurement sensor described in the above can be realized and provided.

According to the invention of claim 5, the sensor electrode of the sensor body according to any one of claims 1 to 4 has a structure having elasticity to press contact with the inner circumference of the pipe metal portion of the pipe. Any of the above claims 1 to 4, which can ensure the electrical connection between the sensor electrode and the metal part of the pipe, accurately execute the signal transmission of the measurement signal and the detection signal, and ensure the accuracy of the measurement. It is possible to realize and provide the sensor for detecting concrete filling and measuring changes in moisture with time according to item 1.

According to the invention of claim 6, the pipe metal portion of the pipe according to any one of claims 1 to 5 can be brought into contact with an annular shape, a semi-annular shape, or a sensor electrode of the sensor body. Since the outer peripheral part is formed in either an elliptical shape that is flush with the outer circumference of the pipe, the scattering range of the electric field from the metal part of the pipe is suppressed and it is affected by the metal parts such as the surrounding reinforcing bars. The sensor for detecting concrete filling and measuring changes in moisture with time according to any one of claims 1 to 5 is realized, which can be made difficult and can grasp the moisture inclination for each depth of a wall surface or the like. Can be provided.

FIG. 1 is a schematic perspective view showing a pipe and a sensor body of a sensor for detecting concrete filling and measuring changes in moisture with time according to an embodiment of the present invention. FIG. 2 is an explanatory view showing an example of the dimensions of the outer diameter and inner diameter of the pipe, the length of the pipe, the metal portion of the pipe, and the resin portion of the pipe in this embodiment. FIG. 3 is an explanatory diagram showing an example of the outer diameter dimension of the sensor body, the diameter of the sensor electrode, and the arrangement pitch of the sensor electrodes in this embodiment. FIG. 4 is a schematic cross-sectional view showing an arrangement mode of an object to be measured by the concrete filling detection / moisture change measurement sensor according to the present embodiment in a measurement state. FIG. 5 is a schematic explanatory view showing the overall configuration of the concrete filling detection / moisture change measurement sensor according to the present embodiment and the moisture measurement principle in the filled state of the concrete to be measured. FIG. 6 is a schematic explanatory view showing a moisture measurement state in a concrete unfilled state by a concrete filling detection / moisture change measurement sensor according to this embodiment. FIG. 7 is a schematic perspective view showing another example of the pipe in the concrete filling detection / moisture change measurement sensor according to the present embodiment. FIG. 8 is a schematic perspective view showing still another example of the pipe in the concrete filling detection / moisture change measurement sensor according to the present embodiment.

The present invention is a simplified concrete structure capable of detecting the filling of concrete from the concrete surface to a certain depth in a certain range and measuring the change of moisture with time, as well as the region near the inside of the surface of the concrete structure. For the purpose of realizing and providing a sensor for filling detection and moisture change measurement with time, it is provided with a plurality of pipe metal parts more than three arranged at a predetermined pitch while sandwiching an insulating part from the outer circumference to the inner circumference, and is a measurement object. The plurality of pipe metal part regions are embedded in the concrete structure, and based on the measurement signal, the electrostatic capacity corresponding to the concrete filling state or the water content aging state of the concrete is applied to the periphery between the plurality of pipe metal parts. A tubular pipe that forms a sensor region, and a pipe that can be inserted into the pipe and is formed longer than the pipe, and has the same pitch as the metal portion of the pipe and the pipe on the outer peripheral portion. The three sensor electrodes, which are smaller in number than the metal part, are provided, and the three sensor electrodes are individually brought into contact with the corresponding three pipe metal parts in a state of being inserted into the pipe at an arbitrary depth, and the three sensor electrodes are individually contacted. A rod-shaped sensor body that supplies measurement signals from the sensor electrodes to the corresponding three pipe metal parts, detects and outputs a detection signal corresponding to the capacitance of the capacitor region, and the three sensor bodies. A measurement signal is supplied to the metal portion of the pipe via the sensor electrode, and a detection signal detected by the sensor body is taken in, and the state of filling concrete in the peripheral region of the three sensor electrode insertion positions of the sensor body or It was realized by a configuration having a moisture measurement processing means for measuring the moisture state according to the change in moisture content of concrete with time.

Hereinafter, the concrete filling detection / moisture aging measurement sensor according to the embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the concrete filling detection / moisture change measurement sensor 1 according to the present embodiment is a metal / resin composite loaded (embedded) in a skeleton 21 filled with concrete 22 in a building to be measured. For example, a bottomed cylindrical pipe 2 made of a material and an electrostatic capacity that is inserted into the pipe 2 through the opening of the pipe 2 to detect the filling of the concrete 22 in the skeleton 21 and to detect a change in moisture with time to obtain a detection signal. In the formula, the round bar-shaped sensor body 11 is connected to the rear end of the sensor body 11 via an electric cable 15, and the concrete 22 is filled or the water content of the concrete 22 changes with time based on the detection signal. It has a moisture measuring processing means 10 for measuring a corresponding moisture state.

Next, the pipe 2 and the sensor body 11 will be described in detail with reference to FIGS. 2 and 3.

As shown in FIG. 2, the pipe 2 is formed of, for example, a bottomed cylindrical shape with an opening at the rear end side by a metal / resin composite material, and the dimensions of each part thereof are a length L (for example, 72 mm) and an outer diameter D1. (For example, 13 mm) and inner diameter D2 (for example, 11 mm) are set.

Further, the pipe 2 has a plurality of (for example, 9) annular pipe metal portions 3 arranged in a row at a predetermined pitch while sandwiching a plurality of (for example, 8) annular pipe insulating portions 4 from the outer circumference to the inner circumference thereof. It has. Further, one pipe insulating portion 4 is continuously provided on the opening end side of the pipe 2.

The alternately arranged row structure of the pipe metal portion 3 and the pipe insulating portion 4 as described above suppresses the scattering range of the electric field to make it less susceptible to the influence of the surrounding metal parts such as reinforcing bars, and at each depth of the wall surface or the like. This is to grasp the water gradient of.

Further, as shown as a typical example in FIG. 1, a scale portion 17 is provided on the outer peripheral portion of the pipe 2 as a guideline for the insertion depth into the skeleton 21. The pitch / shape and display position of the scale portion 17 are not limited to the example of FIG. 1, and can be set to any pitch / shape and display position.

By providing such a scale portion 17, when it is desired to detect an arbitrary position in the concrete structure, it becomes easier to specify the depth of the detection area such as the presence / absence of concrete filling, and the durability evaluation of the concrete building or the like is accurate. It will be possible to further contribute to the improvement of sexuality.

That is, since a scale portion 17 is provided on the outer peripheral portion of the pipe 2 as a guideline for the insertion depth of the pipe 2 into the concrete structure when the pipe 2 is inserted into the concrete structure. Under the condition, as will be described later, when the sensor body 11 having the scale portion 16 on the outer periphery is inserted into the pipe 2, if it is desired to detect an arbitrary position in the concrete structure, each scale portion of the sensor body 11 and the pipe 2 By subtracting 16 and 17, it becomes easier to specify the depth of the detection region at an arbitrary position such as the presence / absence of concrete filling, which can further contribute to the improvement of the accuracy of durability evaluation of concrete buildings and the like.

Note that the scale portion 17 is not shown in FIGS. 2, 4, 5, and 6.

The width t1 of the pipe metal portion 3 in the length direction is set to, for example, 3 mm, and the width t2 of the pipe insulating portion 4 in the length direction is set to, for example, 5 mm.

As a result, the center distance between the two pipe metal portions 3 adjacent to each other with the individual pipe insulating portions 4 interposed therebetween, that is, the pitch of the arrangement of the pipe metal portions 3 is set to be, for example, 8 mm.

On the other hand, as shown in FIG. 3, the sensor body 11 has an outer diameter D3 of, for example, 11 mm so that it can be inserted into the pipe 2.

Further, on a part of the outer circumference of the sensor body 11 on the tip end side, three sensor electrodes 12 having a pitch t3 (= 8 mm) and a diameter d = about 3 mm so as to have the same pitch as the pipe metal portion 3. Is provided so as to elastically project outward (toward the metal portion 3 of the pipe) from the outer circumference of the sensor body 11.

The elasticity of the sensor electrode 12 is determined by, for example, incorporating a small-sized coil spring (not shown) in the base portion of each sensor electrode 12 embedded in the sensor body 11 to impart the elasticity of the coil spring to the sensor electrode 12. It has been realized.

Then, in the state where the sensor body 11 is inserted into the pipe 2, the tops of the three sensor electrodes 12 of the sensor body 11 are pressure-welded to the inner surfaces of the three corresponding pipe metal portions 3 in the pipe 2, respectively. (Elastic contact) It is configured to ensure the contact state.

As a result, it is possible to ensure the electrical connection between the sensor electrode 12 and the metal portion 3 of the pipe, accurately execute the signal transmission of the measurement signal and the detection signal, and ensure the accuracy of the measurement.

Next, refer to FIGS. 4 and 5 for the specific configuration of the concrete filling detection / moisture change measurement sensor 1 according to the present embodiment, the measurement state of the concrete 22 in the skeleton 21 which is the measurement target, and the measurement principle. I will explain.

The three sensor electrodes 12 of the sensor body 11 are connected to the moisture measurement processing means 10 via two signal lines 13 and 14 built in the electric cable 15.

That is, as shown in FIG. 5, of the two signal lines 13 and 14, one end of one signal line 13 is connected to the moisture measurement processing means 10, and the other end is three through the inside of the electric cable 15. It is connected to the central sensor electrode 12 of the sensor electrodes 12 of the above.

Further, one end of the other signal line 14 is connected to the moisture measurement processing means 10, and the other end is common to the two sensor electrodes 12 and 12 on both sides of the three sensor electrodes 12 via the electric cable 15. You are connected.

Further, as shown as a typical example in FIG. 4, a scale portion 16 is provided on the outer peripheral portion of the sensor body 11 as a guideline for the insertion depth of the sensor electrode 12 into the skeleton 21. The pitch / shape and display position of the scale portion 16 are not limited to the examples of FIGS. 1 and 4, and can be set to any pitch / shape and display position.

By providing such a scale portion 16, it becomes easy to specify the depth of the detection region such as the presence / absence of concrete filling, and it becomes possible to contribute to the improvement of the accuracy of the durability evaluation of the concrete building or the like.

Note that the scale portion 16 is omitted in FIGS. 3, 5, and 6.

Based on the configuration as described above, the moisture content of the concrete 22 in the skeleton 21 is measured in the arrangement shown in FIG.

That is, first, the pipe 2 is embedded in the area where the concrete 22 exists in the skeleton 21.

Next, the tip end side of the sensor body 11 is inserted into the pipe 2, and three sensor electrodes 12 are brought into pressure contact with the corresponding three pipe metal portions 3 provided in the pipe 2 in the pipe 2. ..

Next, the moisture measuring processing means 10 is operated, and the concrete is passed through the two signal lines 13 and 14 from the three sensor electrodes 12 of the sensor body 11 to the three pipe metal portions 3 of the pipe 2. A measurement signal (high frequency AC pulse signal) is sent within 22.

As a result, a capacitor region (shown by the arcuate dotted line in FIG. 5) is formed in the peripheral region of the three pipe metal portions 3 in the concrete 22 based on the measurement signal, and the concrete 22 is filled or the concrete 22 is filled. A detection signal corresponding to the capacitance Cx of the capacitor region between the three pipe metal portions 3 in the concrete 22 corresponding to the water content aging state is detected by the three sensor electrodes 12 of the sensor body 11. be able to.

This detection signal is transmitted to the moisture measuring processing means 10 via the two signal lines 13 and 14, and the moisture measuring processing means 10 responds to the filling state of the concrete 22 or the moisture aging state of the concrete 22. Information such as the water content of the concrete 22 can be measured.

More specifically, in the concrete filling detection / moisture change measurement sensor 1 according to the present embodiment, the detection signal is basically only the count value which is an index of the capacitance Cx, but this count value Is converted and the water content is first measured by the water content measuring means 10.

In the case of ready-mixed concrete, the capacitance value is very high, and in the measurement in the unfilled state of concrete as shown in FIG. 6, the capacitance Cx, and therefore the water content, is extremely low. It is possible to detect and measure the state of filling.

Further, if the above-mentioned water content has a discontinuously high or low region with respect to a continuous range of a certain region, it can be estimated that cracks may have occurred there.

From this, according to the concrete filling detection / moisture aging measurement sensor 1 according to the present embodiment, there is a possibility that a cracked portion can be predicted in addition to the water content.

Furthermore, according to the concrete filling detection / moisture change measurement sensor 1 according to the present embodiment, it is possible to detect the filling as it is at the time of placing concrete for forming the skeleton 21.

That is, the sensor 1 for concrete filling detection and moisture change measurement with the pipe 2 fixed to the formwork for forming the skeleton 21 and the sensor body 11 inserted in the pipe 2 before casting. Start the operation of and pour concrete.

As a result, the capacitance Cx becomes very high in the fresh concrete filled state, but extremely low in the hollow state. Therefore, the difference is used to detect the concrete filling state in the peripheral region of the pipe 2. It becomes possible.

FIG. 7 shows a pipe 2A which is another example of the pipe 2, and the basic configuration is the same as that of the pipe 2, but the plurality of pipe metal portions 3A of the pipe 2A are each semi-annular. The outside of both ends of each of the pipe metal portions 3A and between the pipe metal portions 3A are insulated by a pipe insulating portion and arranged in a row at the same arrangement pitch as in the case of the pipe 2.

FIG. 8 shows a pipe 2B which is a further example of the pipe 2, and the basic configuration is the same as that of the pipe 2, but the plurality of pipe metal portions 3B of the pipe 2B are each elliptical. It is configured in a shape, and is arranged in a row at the same arrangement pitch as in the case of the pipe 2 while insulating the outside of both ends of each of the pipe metal portions 3B and between the pipe metal portions 3B by the pipe insulating portion.

The pipe metal portion 3B is arranged so that the sensor electrode 12 of the sensor body 11 has a size that allows contact with the inner surface and the outer peripheral portion is flush with the outer periphery of the pipe 2B.

Even if the pipe 2A shown in FIG. 7 or the pipe 2B shown in FIG. 8 is used, the same actions and effects as those of the pipes 2 shown in FIGS. 1 and 2 described above can be exhibited.

The shape of the metal portion of the pipe is not limited to the above-mentioned examples, and any shape may be used as long as the metal portion can contact the sensor electrode, and various deformations can be performed.

According to the present embodiment described above, based on a simplified configuration consisting of a combination of a set of pipes 2 and a sensor body 11, concrete filling status, cracks, and filled concrete in a fixed area such as a concrete wall surface are used. Since the water content change state of 22 with time can be detected easily, quickly and accurately, it is very useful for evaluating the durability of buildings and the like, and concrete filling detection can realize the convenience of measurement operation. -It is possible to realize and provide a sensor 1 for measuring a change with time of moisture.

In addition to the above cases, the sensor for detecting concrete filling and measuring the change in moisture with time of the present invention can detect soil moisture in farmland, soil moisture detection for growing lawns in parks, golf courses, etc., grains, grass, and wood. It can be widely used in various fields such as chip moisture detection.

1 Sensor for detecting concrete filling and measuring changes in moisture over time 2 Pipe 2A Pipe 2B Pipe 3 Pipe metal part 3A Pipe metal part 3B Pipe metal part 4 Pipe insulation part 10 Moisture measurement processing means 11 Sensor body 12 Sensor electrode 13 Signal line 14 Signal line 15 Electric cable 16 Scale part of sensor body 17 Scale part of pipe 21 Frame 22 Concrete

Claims (6)

A plurality of pipe metal portions arranged at a predetermined pitch while sandwiching an insulating portion from the outer circumference to the inner circumference are provided, and the plurality of pipe metal portion regions are embedded in a concrete structure to be measured, and the measurement signal is used as a basis. A tubular pipe that forms a capacitor region with a capacitance corresponding to the concrete filling state or the water content aging state of concrete around between a plurality of pipe metal parts.
It is formed so as to be insertable into the pipe, and is provided with a plurality of sensor electrodes having the same pitch as the metal portion of the pipe and a smaller number than the metal portion of the pipe on the outer peripheral portion, and can be inserted into the pipe at an arbitrary depth. In this state, the plurality of sensor electrodes are individually brought into contact with the corresponding plurality of pipe metal portions, the measurement signal is supplied from the plurality of sensor electrodes to the corresponding plurality of pipe metal portions, and the capacitance of the capacitor region is capacitance. A rod-shaped sensor that detects and outputs a detection signal according to
Have,
Concrete filling detection, characterized in that the detection signal detected by the sensor body makes it possible to measure the concrete filling state in the region surrounding the sensor electrode insertion position of the sensor body or the water content according to the change in water content of the concrete over time. A sensor for measuring changes in moisture over time. A plurality of pipe metal parts, more than three, arranged in a row at a predetermined pitch while sandwiching an insulating part from the outer circumference to the inner circumference are provided, and the plurality of pipe metal parts regions are embedded in a concrete structure to be measured for measurement. Based on the signal, a tubular pipe that forms a capacitor region with a capacitance corresponding to the concrete filling state or the concrete moisture content aging state around the plurality of pipe metal parts, and
Three sensor electrodes that can be inserted into the pipe and are formed longer than the pipe, and have the same pitch as the metal portion of the pipe and a smaller number than the metal portion of the pipe are provided on the outer peripheral portion. In the state of being inserted into the pipe at an arbitrary depth, the three sensor electrodes are individually brought into contact with the corresponding three pipe metal parts, and the three sensor electrodes are transferred to the corresponding three pipe metal parts. A rod-shaped sensor body that supplies a measurement signal, detects and outputs a detection signal according to the capacitance of the capacitor region, and
A measurement signal is supplied to the pipe metal portion of the pipe via the three sensor electrodes of the sensor body, and a detection signal detected by the sensor body is taken in to be around the three sensor electrode insertion positions of the sensor body. Moisture measurement processing means for measuring the filling state of the concrete in the area or the moisture state according to the change in the moisture content of the concrete with time,
A sensor for detecting concrete filling and measuring changes in moisture over time, which is characterized by having. The concrete filling detection / moisture change with time according to claim 1 or 2, wherein a scale portion serving as a guide for the insertion depth of the sensor electrode into the concrete structure is provided on the outer peripheral portion of the sensor body. Measurement sensor. The third aspect of claim 3, wherein the outer peripheral portion of the pipe is provided with a scale portion that serves as a guide for the insertion depth of the pipe into the concrete structure when the pipe is inserted into the concrete structure. A sensor for detecting concrete filling and measuring changes in moisture over time. The concrete filling detection / moisture aging according to any one of claims 1 to 4, wherein the sensor electrode of the sensor body has a structure having elasticity to press contact with the inner circumference of the metal portion of the pipe of the pipe. Change measurement sensor. The pipe metal portion of the pipe is formed in an annular shape, a semi-annular ring shape, or an elliptical shape having a size that allows the sensor electrodes of the sensor body to be contacted and the outer peripheral portion to be flush with the outer peripheral portion of the pipe. The sensor for detecting concrete filling and measuring changes in moisture with time according to any one of claims 1 to 5, wherein the sensor is characterized by the above.

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