JP6970408B2 - Concrete strength estimation system, concrete strength estimation method and program - Google Patents

Description

The present invention relates to a concrete strength estimation system, a concrete strength estimation method and a program.

The core sampling method is known as a method for measuring the compressive strength of conventional concrete. The core sampling method has a problem that it takes a lot of time and cost because a part of the building is sampled and investigated. There is also the problem that a part of the building needs to be collected as a sample.

On the other hand, a non-destructive survey method that does not require sample collection, such as a survey method using a concrete tester, is also known. These survey methods have the advantage of saving time and cost compared to the core sampling method. On the other hand, there is a problem that the accuracy of the survey results is lower than that of the core sampling method.

As another non-destructive investigation method for estimating the compressive strength of concrete, a method for measuring the compressive strength by a drill method is also known (see, for example, Patent Document 1). In the drill method, when drilling a hole in a concrete structure, the drilling speed, which is the speed at which the tip of a part forming a hole such as a drill or a grindstone moves, has a predetermined relationship with the compressive strength of concrete. This is a survey method that makes use of this.

JP-A-2015-212637

In the investigation method using the above-mentioned drill method, the concrete including the mortar portion and the aggregate portion in the concrete structure portion is drilled, and the compressive strength of the concrete is estimated based on the drilling speed at that time. Therefore, there is a problem that it is difficult to improve the estimation accuracy of the compressive strength of concrete.

The present invention has been made to solve the above-mentioned problems, and is a concrete strength estimation system and a concrete strength estimation method that can easily improve the estimation accuracy of compressive strength in concrete without collecting a sample. And the purpose is to provide the program.

In order to achieve the above object, the present invention provides the following means.
In the concrete strength estimation system according to the first aspect of the present invention, the drilling portion for forming a hole in the concrete structure portion, the pressing portion for pressing the drilling portion against the concrete structure portion, and the drilling portion are rotated. The compressive strength in the concrete structure part is calculated based on the driving part to be made to move, the measuring part for measuring the moving speed of the hole in the drilling part in the depth direction, and the moving speed measured by the measuring part. The calculation unit is provided, and the calculation unit acquires the movement speed from the measurement unit, and the drilled portion forms a hole in the mortar portion included in the concrete structure portion from the acquired movement speed. The moving speed of the fine-grained aggregate, which is the moving speed of the region where the fine-grained aggregate is distributed, is extracted, and the speed of the fine-grained aggregate mortar portion extracted is used as the basis for the speed of the fine-grained aggregate mortar portion of the concrete structure portion. It is characterized in that the compressive strength is obtained by calculation.

In the method for estimating the concrete strength according to the second aspect of the present invention, a hole is formed by pressing the drilled portion against the concrete structural portion with a predetermined force and rotating the hole with a predetermined torque, and when the hole is formed. A measurement step for measuring the moving speed of the hole in the drilled portion in the depth direction, an acquisition step for acquiring the measured moving speed, and a mortar contained in the concrete structure portion from the acquired moving speed. About the portion An extraction step for extracting the moving speed of the portion where the drilled portion forms a hole, which is the moving speed of the region where the fine particle aggregate is distributed, and the extraction step for extracting the fine particle aggregate mortar portion speed, and the extracted fine particles. It is characterized by having an calculation step of obtaining the compressive strength of the concrete structure part by calculation based on the speed of the aggregate mortar part.

In the program according to the third aspect of the present invention, a hole is formed by pressing the drilled portion against the concrete structure portion with a predetermined force and rotating the hole with a predetermined torque, and the hole is formed. From the acquisition function of acquiring the moving speed of the hole in the drilling portion in the depth direction and the acquired moving speed, the drilling portion forms a hole in the mortar portion included in the concrete structure portion. The extraction function for extracting the moving speed of the fine particle aggregate mortar portion, which is the moving speed of the portion, which is the moving speed of the region where the fine particle aggregate is distributed, and the extraction function of the concrete structure portion based on the extracted fine particle aggregate mortar portion speed. It is characterized by realizing a calculation function for obtaining the compressive strength by calculation.

According to the concrete strength estimation system according to the first aspect of the present invention, the concrete strength estimation method according to the second aspect, and the program according to the third aspect, the movement in the hole depth direction in the drilled portion. It is the speed (in other words, the drilling speed), which is the moving speed of the region where the fine particle aggregate is distributed among the moving speeds when the drilled portion is drilling the mortar portion contained in the concrete structure portion. The compressive strength of the concrete structure is calculated based on the velocity of the fine aggregate mortar. That is, from the moving speed of drilling the mortar portion used for calculating the compressive strength, the moving speed when the drilling portion is drilling the coarse aggregate contained in the concrete structure portion, and the fineness contained in the mortar portion. By extracting the drilling speed of the fine particle aggregate mortar portion from which the moving speed when drilling the aggregate is removed, it is easy to improve the estimation accuracy of the compressive strength of the concrete structure portion. In addition, the compressive strength can be estimated without collecting a sample from the concrete structure.

The concrete structure portion is composed of at least a mortar portion, concrete having a coarse aggregate, and reinforcing bars. Concrete is made by adding gravel (coarse aggregate) to mortar, which is a mixture of cement, fine aggregate, fine particle aggregate (sand, etc.) and water, and hardening it. The concrete includes a mortar portion, which is a portion where the mortar is hardened, and a portion of coarse aggregate.

In the first aspect of the above invention, the calculation unit is a portion in which the amplitude of the movement speed with respect to the depth direction is equal to or less than the first threshold value when the velocity of the fine particle aggregate mortar portion is extracted from the acquired movement speed. Is desirable as the velocity of the mortar portion of the fine particle aggregate.

By extracting the portion where the amplitude of the moving speed in the depth direction is equal to or less than the first threshold value as the velocity of the fine particle aggregate mortar portion, the drilled portion is a portion other than the fine particle aggregate mortar portion such as coarse aggregate. It becomes easier to remove the moving speed when drilling holes. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

In the first aspect of the above invention, when the arithmetic unit extracts the fine particle aggregate mortar part velocity from the acquired moving velocity, the amplitude of the moving velocity with respect to the depth direction is equal to or less than the first threshold value. It is desirable to extract a portion having a length of the portion in the depth direction of the second threshold value or more as the velocity of the fine particle aggregate mortar portion.

By extracting the portion where the length in the depth direction of the portion where the amplitude of the moving speed is equal to or less than the first threshold value is equal to or greater than the second threshold value as the fine particle aggregate mortar velocity, the drilled portion is made of coarse aggregate and mortar. It becomes easier to remove the moving speed when drilling a portion other than the fine aggregate mortar portion such as the fine aggregate contained in the portion. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

In the first aspect of the present invention, when the position of the drilled portion with respect to the concrete structure portion changes, the fluctuation range of the force for pressing the drilled portion against the concrete structure portion is the first predetermined value. It is desirable that it is as follows.

By setting the fluctuation range of the pressing force by the pressing portion to the first predetermined value or less in this way, it becomes easy to suppress the fluctuation of the moving speed due to factors other than the compressive strength of the concrete structure portion. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

In the first aspect of the above invention, it is desirable that the fluctuation range of the rotation speed, which is the rotation speed of the drilled portion for a predetermined time, is equal to or less than the second predetermined value of the driving unit.
By setting the fluctuation range of the rotation speed of the drilled portion to the second predetermined value or less in this way, it becomes easy to suppress the fluctuation of the moving speed due to factors other than the compressive strength of the concrete structure portion. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

According to the concrete strength estimation system, the concrete strength estimation method and the program of the present invention, the fine particle aggregate is the moving speed when the drilled portion is drilling the fine particle aggregate mortar portion contained in the concrete structure portion. Since the compressive strength of the concrete structure is calculated based on the speed of the mortar, it is easy to improve the estimation accuracy of the compressive strength in concrete without collecting a sample.

It is a schematic diagram explaining the structure of the concrete strength estimation system which concerns on one Embodiment of this invention. It is a block diagram explaining the structure in the information processing unit of FIG. It is a flowchart explaining the method of estimating concrete strength. It is a graph explaining the extraction method of the mortar part velocity from the drilling velocity.

The concrete strength estimation system according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. The estimation system 1 of the present embodiment estimates the compressive strength of concrete in the reinforced concrete skeleton (concrete structure portion) 50 of a building. The reinforced concrete skeleton 50 includes a concrete 51 in which a mortar portion 52 and a coarse aggregate 53 such as gravel are mixed, a reinforcing bar 54 arranged inside the concrete 51, and a finishing layer 55 arranged on the surface of the concrete 51. , Is mainly composed of.

The mortar portion 52 is a mixture of cement and fine aggregates such as sand and fine particle aggregates. The mortar portion 52 has a fine aggregate and a region in which the fine particle aggregate in which the fine aggregate does not exist is distributed. The strength of the hardened concrete 51 is developed by the mortar portion 52. It is possible to estimate the compressive strength of concrete in the reinforced concrete skeleton 50 by using the measurement data when the region where the fine particle aggregate is distributed in the mortar portion 52 is drilled. In this embodiment, sand having a particle size of about 0.6 mm or less is classified as fine aggregate, sand having a particle size of more than about 0.6 mm and having a particle size of about 5 mm or less is classified as fine aggregate, and gravel having a particle size of more than 5 mm. Will be described by classifying it into the coarse aggregate 53.

As shown in FIG. 1, the estimation system 1 includes a drilling device 10 that drills a hole in a reinforced concrete skeleton 50 and measures a drilling speed (moving speed), and a reinforced concrete based on the measured drilling speed. An information processing unit (calculation unit) 30 that estimates the compressive strength of concrete in the skeleton 50 by calculation is mainly provided.

The drilling device 10 includes a cylindrical case 11, a drill drilling portion (drilling portion) 12, an electric motor (driving portion) 14, a constant load spring (pressing portion) 15, and a displacement measurement sensor (measuring unit). 16 and a control unit 17 are mainly provided.

The cylindrical case 11 is a cylindrical housing that constitutes the outer shape of the drilling device 10. Inside the cylindrical case 11, a drill drilling portion 12, an electric motor 14, a constant load spring 15, and a displacement measurement sensor 16 are housed. The control unit 17 may be housed in the cylindrical case 11 or may be attached to the outer surface of the cylindrical case 11. Further, in the present embodiment, the example in which the cylindrical case 11 is formed into a cylindrical shape will be described, but the shape may not be particularly limited as long as it may be formed into a square cylinder.

The cylindrical case 11 is mainly provided with an inner case 11a formed in a cylindrical shape with both ends open and an outer case 11b formed in a cylindrical shape with one end closed. A part of the inner case 11a is arranged so as to enter the inside of the outer case 11b, and is arranged so as to be movable relative to the outer case 11b in the insertion direction and the protrusion direction.

The drilled hole portion 12 forms a hole in the reinforced concrete skeleton 50. In the present embodiment, the drilled hole portion 12 is formed in a columnar shape, and will be described by applying it to an example in which a hole having a diameter of about 3 mm and a depth of about 10 mm can be formed. Further, the specific shape of the drilled hole 12, the material constituting the drill, the shape of the hole to be formed, and the diameter and depth values may be any as long as the compressive strength of the concrete can be calculated. It is not limited.

The electric motor 14 rotates and drives the drill drilling portion 12 arranged at the tip of the rotating shaft 13. The electric motor 14 is controlled by the control unit 17 so that the rotation speed, which is the rotation speed in a predetermined time, becomes the target rotation speed. In this embodiment, an example in which the target rotation speed is 4000 rotations / minute will be described. Further, the fluctuation range of the rotation speed is controlled to be about 200 rotations / minute (second predetermined value) or less, in other words, the rotation speed is controlled to be constant.

As the type of the electric motor 14, a known type can be used, and the specific type is not limited. Further, in the present embodiment, the drilled hole 12 is rotationally driven by the electric motor 14, but the electric motor 14 can form a hole in the reinforced concrete skeleton 50 by the drilled hole 12. Other than that may be used.

The constant load spring 15 presses the drilled hole portion 12 against the reinforced concrete skeleton 50 with a target pressing force. One end of the constant load spring 15 is attached to the outer case 11b and the other end is attached to the electric motor 14. As the constant load spring 15, a known type that can generate a constant pressing force can be used, and the specific type is not limited.

When the operator holds the outer case 11b and presses the drilled hole portion 12 against the reinforced concrete skeleton 50, the pressing force is adjusted to the target value by the constant load spring 15. In this embodiment, it will be described by applying it to an example in which the pressing force of the target is about 28N to about 30N. Further, it will be described by applying it to an example in which the fluctuation range of the pressing force is about 2N (first predetermined value) or less, in other words, it will be described by applying it to an example in which the pressing force is constant.

The displacement measurement sensor 16 measures the drilling speed, which is the moving speed of the drill drilling portion 12 in the depth direction. The displacement measurement sensor 16 has a configuration capable of outputting a signal representing the measured drilling speed to the outside. As the displacement measurement sensor 16, a known configuration or type can be used, and the specific configuration or type is not limited.

The control unit 17 controls the rotation of the electric motor 14, and controls the rotation speed of the drill drilling unit 12 to be kept constant. The control unit 17 may perform analog control using an electronic circuit or may perform digital control using a microcomputer, and its format is not limited.

The information processing unit 30 estimates the compressive strength of concrete in the reinforced concrete skeleton 50 by calculation based on the drilling speed of the drill drilling portion 12 measured by the displacement measurement sensor 16. In this embodiment, the information processing unit 30 will be described by applying it to an example of an information processing device such as a personal computer or a microcomputer having a CPU (central processing unit), ROM, RAM, input / output interface, and the like.

As shown in FIG. 2, the program stored in the storage device such as the ROM described above has a CPU, a ROM, a RAM, and an input / output interface in cooperation with each other to form an acquisition unit 31, a storage unit 32, an extraction unit 33, and a program. It functions as an estimation unit 34.

The acquisition unit 31 is connected to the displacement measurement sensor 16 so as to be able to transmit and receive a signal, and acquires a signal representing the drilling speed output from the displacement measurement sensor 16.
The storage unit 32 stores at least a signal representing the drilling speed acquired by the acquisition unit 31 and various information necessary for calculating the compressive strength of concrete based on the drilling speed.

The extraction unit 33 extracts the flat corrugated portion Vm, which is a portion that uses the compressive strength of concrete for calculation, from the acquired drilling speed (see FIG. 3). The content of the arithmetic processing for extracting the flat waveform portion Vm will be described later.

The estimation unit 34 estimates the compressive strength of concrete by calculation based on the flat corrugated portion Vm extracted by the extraction unit 33. The content of the arithmetic processing for estimating the compressive strength will be described later.

Next, a method of estimating the concrete compressive strength of the reinforced concrete skeleton 50 in the estimation system 1 having the above configuration will be described with reference to FIGS. 1 to 4. When estimating the concrete compressive strength of the reinforced concrete skeleton 50, first, as shown in FIGS. 1 and 3, the finishing layer 55 at the portion where the estimation is performed in the reinforced concrete skeleton 50 is removed to expose the surface of the concrete 51 (S10).

In this embodiment, when the concrete compressive strength of the reinforced concrete skeleton 50 is estimated, the finishing layer 55 is described by applying it to an example in which the finishing layer 55 at the estimation location is removed to expose the surface of the concrete 51. The concrete compressive strength of the reinforced concrete skeleton 50 may be estimated without removing it.

Next, the drilling speed in the exposed concrete 51 is measured (S20: measurement step). Specifically, the operator holds the outer case 11b of the drilling device 10 and presses the drilled hole portion 12 against the exposed surface of the concrete 51. After that, the drill drilling portion 12 is rotated at a constant rotation speed by the electric motor 14 to drill a hole in the concrete 51. The drilling speed of the concrete 51 by the drilling portion 12, in other words, the moving speed in the depth direction of the hole is measured by the displacement measurement sensor 16.

The depth of the hole to be drilled can be exemplified by about 10 mm from the surface of the exposed concrete 51. When drilling by the drilling portion 12, the force with which the drilling portion 12 is pressed against the concrete 51 by the constant load spring 15 is kept constant. The portion where the drilling portion 12 is drilled is selected from the portion of the surface of the exposed concrete 51 excluding the fragile portion.

The displacement measurement sensor 16 outputs a signal representing the measured drilling speed, and the acquisition unit 31 of the information processing unit 30 acquires the output signal (S30: acquisition step). The signal may be acquired in parallel with the measurement of the drilling speed, or the measured signal indicating the drilling speed may be collectively acquired after the drilling is completed. The acquired signal is stored in the storage unit 32 of the information processing unit 30.

The extraction unit 33 of the information processing unit 30 analyzes a waveform of the drilling speed represented by the acquired signal, and thereby has a plurality of flat waveform parts (fine particle aggregate mortar part speed) Vm (3 or more in this embodiment). Perform the arithmetic processing for extraction (S40: extraction step). Here, the flat corrugated portion Vm is a portion of the drilling speed in which the drill drilling portion 12 drills a region of the mortar portion 52 in which the fine particle aggregate is distributed. In other words, the drilling speed when the drilling portion 12 is drilling coarse aggregate or voids, or the drilling speed when drilling fine aggregate contained in the mortar portion 52. It is the drilling speed of the excluded part.

Specifically, as shown in FIG. 4, in the drilling speed included in the extraction range ER, the amplitude of the drilling speed is equal to or less than a predetermined first threshold value (for example, 0.05 mm / s) and drilling. A portion where the depth at which the hole is drilled while maintaining the state where the amplitude of the hole velocity is equal to or less than the predetermined first threshold value is equal to or larger than the predetermined second threshold value (for example, 0.5 mm) is extracted as the flat corrugated portion Vm. ..

By setting the first threshold value, the drill drilling portion 12 drills a region of the mortar portion 52 in which the fine particle aggregate is distributed, or the fine particle aggregate of the mortar portion 52 such as the coarse aggregate 53 is drilled. It becomes easy to determine whether or not a hole is drilled in a place other than the area where the particles are distributed. That is, when the mortar portion 52 in which the cement is mixed with the fine aggregate and the fine particle aggregate is drilled, the amplitude of the drilling speed is within the first threshold value. On the other hand, when the drill drilling portion 12 drills a hole having a larger particle size than the fine aggregate and the fine particle aggregate such as the coarse aggregate 53, the amplitude of the drilling speed sets the first threshold value. Exceed. Further, by providing the second threshold value, it becomes easier to stably extract the flat waveform portion Vm as compared with the case where the second threshold value is not provided.

Here, 0.05 mm / s exemplified as the first threshold value is a value when one of the preconditions is that the particle size of the fine particle aggregate contained in the mortar portion 52 is about 0.6 mm or less. Therefore, when the particle size of the fine particle aggregate changes, the value of the first threshold value becomes a value other than 0.05 mm / s.

In this embodiment, the extraction range ER will be described by applying it to an example in which the range is 0.1 mm / s or more and 0.5 mm / s or less. When the drilling speed is slower than the lower limit of the extraction range ER, it is said that the drill drilling portion 12 is drilling another part of the mortar portion 52 that is harder than the region where the fine particle aggregate is distributed. Conceivable. If the drilling speed is faster than the upper limit of the extraction range ER, is the drill drilling portion 12 drilling another softer part of the mortar portion 52 than the region where the fine particle aggregate is distributed? It is thought that it is moving through the void. The range of the extraction range ER varies appropriately depending on the material to be investigated, the material shape of the drill drilling portion 12, the rotation speed at the time of drilling, the pressing force, and the like, and is not limited to the above-mentioned values.

Similarly, the first threshold value and the second threshold value also appropriately vary depending on the material to be investigated, the material shape of the drill drilling portion 12, the rotation speed at the time of drilling, the pressing force, and the like, and are described above. It is not limited to the value.

When a plurality of flat waveform units Vm are extracted, the estimation unit 34 performs arithmetic processing for obtaining the average drilling speed Vi, which is the average of the flat waveform units Vm (S50). In this embodiment, it will be described by applying it to an example of obtaining an average drilling speed Vi by an arithmetic mean (also referred to as an arithmetic mean).

When the average drilling speed Vi is obtained, the estimation unit 34 performs an arithmetic process for estimating the compressive strength of the concrete 51 (S60: arithmetic step). Specifically, an arithmetic process for obtaining the compressive strength is performed based on the following equation (1) and the average drilling speed Vi.

ここで、ＦＣは圧縮強度であり、Ｖは平均削孔速度Ｖｉである。

Here, FC is the compressive strength, and V is the average drilling speed Vi.

According to the estimation system 1 having the above configuration, it is the moving speed (in other words, the drilling speed) of the drill drilling portion 12 in the depth direction, and the mortar in which the drilling drilling portion 12 is included in the reinforced concrete skeleton 50. The compressive strength of the reinforced concrete skeleton 50 can be obtained by calculation based on the flat corrugated portion Vm, which is the moving speed when the region of the portion 52 in which the fine particle aggregate is distributed is drilled. Therefore, from the flat corrugated portion Vm used for calculating the compressive strength, the moving speed when the drill drilling portion 12 drills the coarse aggregate 53 included in the reinforced concrete skeleton 50, and the fine particles in the mortar portion 52. The moving speed when drilling a hole other than the region where the aggregate is distributed is removed, and it becomes easy to improve the estimation accuracy of the compressive strength of the reinforced concrete skeleton 50. Further, the compressive strength can be estimated without collecting a sample from the reinforced concrete skeleton 50.

By extracting the portion where the amplitude of the drilling velocity in the depth direction of the hole is equal to or less than the first threshold value as the flat corrugated portion Vm, the drilled drilling portion 12 is the fine particle bone of the mortar portion 52 such as the coarse aggregate 53. It becomes easier to remove the drilling speed when drilling a part other than the area where the material is distributed. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

By extracting the portion where the amplitude of the drilling speed is equal to or less than the first threshold value and the drilling length in the hole depth direction is equal to or greater than the second threshold value as the flat corrugated portion Vm, the drill drilling portion is formed. It becomes easier to remove the drilling speed when the 12 is drilling a portion of the mortar portion 52 such as the coarse aggregate 53 other than the region where the fine particle aggregate is distributed. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

By setting the fluctuation range of the pressing force by the constant load spring 15 to the first predetermined value or less, it becomes easy to suppress the fluctuation of the drilling speed due to factors other than the compressive strength of the reinforced concrete skeleton 50. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

By setting the fluctuation range of the rotation speed of the drill drilling portion 12 to the second predetermined value or less, it becomes easy to suppress the fluctuation of the drilling speed due to factors other than the compressive strength of the reinforced concrete skeleton 50. Therefore, it becomes easy to improve the estimation accuracy of the compressive strength.

The technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, in the above embodiment, the drilling device 10 and the information processing unit 30 are arranged separately from each other, but the drilling device 10 and the information processing unit 30 are integrally configured. Is also good.

1 ... estimation system, 12 ... drill drilling part (drilling part), 14 ... electric motor (driving part), 15 ... constant load spring (pressing part), 16 ... displacement measurement sensor (measurement part), 17 ... control unit , 30 ... Information processing unit (calculation unit), 50 ... Reinforced concrete skeleton (concrete structure part), 52 ... Mortar part, Vm ... Flat corrugated part (fine particle aggregate mortar part speed), S20 ... Measurement step, S30 ... Acquisition step, S40 ... Extraction step, S60 ... Calculation step

Claims (5)

A drilling part that forms a hole in the concrete structure and a hole
A pressing portion that presses the drilled portion against the concrete structure portion, and a pressing portion.
A drive unit that rotates the drilled portion and
A measuring unit that measures the moving speed of the hole in the drilled portion in the depth direction, and a measuring unit.
An arithmetic unit that calculates the compressive strength in the concrete structure based on the moving speed measured by the measurement unit, and a calculation unit.
Is provided,
The calculation unit acquires the movement speed from the measurement unit and obtains the movement speed.
From the acquired moving speed, it is the moving speed of the portion of the mortar portion included in the concrete structure where the drilled portion forms a hole, and the moving speed of the region where the fine aggregate and the fine aggregate are distributed. The speed of the fine particle aggregate mortar portion is extracted, and the compressive strength of the concrete structure portion is calculated based on the extracted fine particle aggregate mortar portion velocity.
When the arithmetic unit extracts the fine particle aggregate mortar part velocity from the acquired moving speed, the amplitude of the moving speed with respect to the depth direction is larger than that of the fine aggregate and the fine aggregate aggregate. estimation system features and to Turkey Nkurito intensity that the part is less than the first threshold value is extracted as the fine aggregate mortar section rate which is a boundary between the amplitude in the case that drilling things. The pressing portion is characterized in that, when the position of the drilled portion with respect to the concrete structure portion changes, the fluctuation range of the force for pressing the drilled portion against the concrete structure portion is equal to or less than a first predetermined value. The concrete strength estimation system according to claim 1. The concrete strength according to any one of claims 1 to 2 , wherein the drive portion has a fluctuation range of a rotation speed which is a rotation speed of a predetermined time in the drilled portion of a second predetermined value or less. Estimating system. A hole is formed by rotating the hole with a predetermined torque while pressing the hole with a predetermined force against the concrete structure, and the moving speed of the hole in the hole in the depth direction when the hole is formed. And the measurement steps to measure
The acquisition step to acquire the measured movement speed and
From the acquired movement speed, the movement speed of the portion of the mortar portion included in the concrete structure portion in which the drilled portion forms a hole, that is, the movement speed of the region where the fine aggregate and the fine aggregate are distributed. When extracting from the moving speed obtained from the fine-grained aggregate mortar portion , the fine-grained aggregate and the fine-grained aggregate having a larger particle size than the fine-grained aggregate and the fine-grained aggregate are drilled. The extraction step of extracting the portion below the first threshold value, which is the boundary with the amplitude in the case of the above, as the velocity of the fine particle aggregate mortar portion.
An arithmetic step of calculating the compressive strength of the concrete structure based on the extracted velocity of the fine particle aggregate mortar portion, and
A method for estimating concrete strength, which comprises having. On the computer
A hole is formed by rotating the hole with a predetermined torque while pressing the hole with a predetermined force against the concrete structure, and the moving speed of the hole in the hole in the depth direction when the hole is formed. And the get function to get
From the acquired movement speed, the movement speed of the portion of the mortar portion included in the concrete structure portion in which the drilled portion forms a hole, that is, the movement speed of the region where the fine aggregate and the fine aggregate are distributed. When extracting from the moving speed obtained from the fine-grained aggregate mortar portion , the fine-grained aggregate and the fine-grained aggregate having a larger particle size than the fine-grained aggregate and the fine-grained aggregate are drilled. An extraction function that extracts the portion below the first threshold value, which is the boundary with the amplitude in the case of the above, as the velocity of the fine particle aggregate mortar portion.
An arithmetic function for calculating the compressive strength of the concrete structure based on the extracted velocity of the fine particle aggregate mortar portion, and
A program characterized by realizing.

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