JP2018080514A - Quality control device for concrete surface shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quality control device for concrete surface shape which can measure roughness depth with sufficient accuracy and can easily perform measurement and quality judgment.SOLUTION: A quality control device 1 for managing the roughness depth of a surface 20a of a concrete base 20 for tiling, comprises: a depth measuring unit 3 for measuring the roughness depth of the surface 20a of the concrete base 20; a quality judging unit for judging whether the measured value of the roughness depth of the surface 20a of the concrete base 20 measured by the depth measuring unit 3 is less than a preset threshold value or not; and a judgment display unit 5 for roughness depth for displaying the quality judgment result of roughness depth.SELECTED DRAWING: Figure 1

Description

  The present invention measures the depth of roughening of the concrete foundation surface for tiling, compares the measured value with the necessary limit value of roughening depth that can prevent tile peeling, and determines the presence or absence of tile peeling. The present invention relates to a surface shape quality control device.

In the construction of a building structure, it is widely practiced to tile a base surface of a wall formed of concrete at a construction site. Various techniques have been developed and implemented to prevent the peeling and peeling of tiles stretched on the concrete substrate.
For example, Patent Document 1 discloses a method for evaluating the peeling risk of a finished tile bonded with an adhesive to the surface of an underlying concrete of a building.
Further, Patent Document 2 discloses a front tile that is provided with its back side embedded in high-strength concrete. In this pre-attached tile, when the reinforcing member with a convex shape in side view protruding in a bowl shape from the back of the pre-attached tile toward the high-strength concrete is subjected to the vertical load of the high-strength concrete from the upper surface of the pre-attached tile It is horizontally provided along the upper side of the leading tile at the site where the maximum amount of deflection occurs. This prevents peeling and peeling of the front tile from the high-strength concrete surface.

Patent Document 2 discloses that the tile structure is devised to prevent the tile from peeling off, but a treatment for preventing the tile peeling is also performed on the concrete base instead of the tile. Yes. For example, it is well known that the surface of a concrete substrate is roughened by an ultra-high pressure water cleaning method or the like to perform the substrate treatment.
In order to effectively prevent peeling of tiles from the concrete substrate, the roughening depth of the concrete substrate must be a certain level or more. It is essential to judge. In general, the quality of the roughening depth is often determined by preparing a pass / fail determination sample in advance and comparing the pass / fail determination sample with the actual background processing status. As a result of the quality determination, the background processing is repeatedly performed until the actual background processing status becomes equal to or higher than the pass / fail determination sample.
As described above, the quality determination of the roughening depth using the pass / fail determination sample is not quantitative, and is performed by human eyes, so the result of the quality determination is the ambient brightness, etc. It depends on the environment at the time of quality judgment and the personality of the person who performs the quality judgment. Therefore, in some cases, the background may not be processed sufficiently to the same extent as the pass / fail judgment sample.

On the other hand, in Patent Document 3, the glossiness of the concrete surface after the ground treatment is measured with a gloss meter, and the surface roughness of the treated concrete surface is quantitatively evaluated and managed using the glossiness as an index. A quality control method for a concrete ground surface is disclosed.
In Patent Document 3, in order to measure the glossiness efficiently and accurately, the unevenness of the concrete surface is imprinted on a thin metal foil such as an aluminum foil, and the glossiness is glossed using it as a test specimen. It is recommended to measure with a dynamometer. That is, when the surface roughness is to be measured with high accuracy by the method of Patent Document 3, the surface roughness of the concrete surface needs to be embossed on a thin metal foil as described above. Compared with direct measurement, the process is more complicated, and quality determination including measurement is not easy.
Moreover, since the thin metal foil may be wrinkled even if it is touched by hand for embossing, there is a possibility that the metal foil may have irregularities deeper than the actual concrete surface. In other words, even when the surface roughness of the concrete surface is actually inadequate, as a result of quality judgment on the metal foil with deeper irregularities, it is determined that the concrete surface has sufficient surface roughness. As a result, the tile and the concrete base may not be joined with sufficient strength, and the tile may peel off. Thus, in the method of Patent Document 3, even if a metal foil is used, there is a limit to the measurement accuracy of the surface roughness. Also, in order to maintain sufficient accuracy, working to prevent the metal foil from wrinkling will require a long time for quality judgment work including measurement, and experience in pass / fail judgment of surface roughness. Based on the judgment skill required.

JP 2012-208042 A Japanese Patent No. 5905775 JP 2009-24468 A

Hiroshi Nachi: Research on strain followability in exterior tile finishing, Kogakuin University, PhD (Engineering) degree thesis, March 2006

  The problem to be solved by the present invention is to provide a quality control device for the shape of a concrete surface that can measure the roughening depth with sufficient accuracy and is easy to carry out measurement and quality determination.

The present inventors have used a surface roughness meter that can measure the roughening depth of the concrete ground surface as a quality judgment method for the roughening depth of the concrete ground surface for tiles. By setting the required depth limit value (threshold value), comparing the measured value with the required limit value, and adding the function to determine the presence or absence of tile separation, it is possible to immediately determine the presence or absence of tile separation at the construction site Attention was focused on the quality control device for the concrete surface shape of the present invention.
The present invention employs the following means in order to solve the above problems. That is, the present invention is a quality control device for managing the roughening depth of the concrete foundation surface for tiled, a depth measurement unit for measuring the roughening depth of the concrete foundation surface, and the depth measurement unit The roughness determination quality determination unit for determining whether the measured roughness level of the concrete foundation surface measured in step 1 is less than or equal to a preset threshold value, and the roughness determination quality determination result. There is provided a quality control device for a concrete surface shape, characterized in that it comprises a roughening depth determination display section to be displayed.
According to the configuration as described above, since the roughening depth of the concrete base surface is directly measured with respect to the concrete base surface by the depth measurement unit, indirect work such as embossing on the metal foil Thus, the accuracy of the measured value is not impaired. Therefore, the roughening depth can be measured with sufficient accuracy.
In addition, as described above, the roughening depth can be directly measured without using an indirect work such as embossing on the metal foil, so that the quality determination work including the measurement is easy.
Also, the quality of the measurement results is compared with a preset threshold value to judge the quality and the result is displayed on the judgment display section. Is possible. The quality determination is quantitatively performed by comparing the measured value of the roughening depth with a threshold value. Therefore, it is possible to carry out quality determination work including measurement easily and surely even in a short time.

In one aspect of the present invention, the threshold value is a limit value of a roughening depth at which an adhesive interface fracture occurs between the tile and the concrete base surface.
According to the above configuration, as the threshold value, for example, the limit value of the roughening depth at which the adhesive interface fracture occurs in the strain followability test using the tiled test body in which the tile is bonded to the concrete surface is used. By recording it as a database and managing it so as to be equal to or greater than the measurement value of the rough surface depth of the concrete base surface, it is possible to effectively prevent the peeling of the tile.

In another aspect, a concrete surface shape quality control apparatus includes a plurality of the depth measuring units.
According to the above configuration, it is possible to measure the roughening depth at a plurality of locations on the concrete foundation surface at the same time. Therefore, in order to increase the measurement accuracy, it is a case where it is desired to measure the roughening depth at a plurality of locations. However, it is only necessary to carry out the measurement operation once, so that the measurement can be carried out more easily.

  According to the present invention, it is possible to provide a quality control device for a concrete surface shape, which can measure the roughening depth with sufficient accuracy and can easily perform measurement and quality determination.

The quality control apparatus of the concrete surface shape by embodiment of this invention, (a) is a perspective view, (b) is explanatory drawing. It is a block diagram of the control part which comprises the quality control apparatus of concrete surface shape. It is an Example of the threshold value table of the required roughening depth which comprises the quality control apparatus of concrete surface shape. It is explanatory drawing of the cleaning pattern by a super-high pressure water cleaning method. It is a comparison figure of the measurement result of the roughening depth by the quality control apparatus of a concrete surface shape, and a laser displacement meter. The tiled concrete prism test piece (a) is a front view, and (b) is a plan view. It is the combination table | surface of the experimental parameter used in the compression axial strain followability test of the tile by the tiled concrete prism test piece. It is an applied pattern figure of compression load in a compression axis distortion followability test of a tile. It is a graph which shows the test result 1 (test body without a super-high pressure washing | cleaning) of the compression axial distortion of a concrete surface, and a heat-cooling repetition number. It is a graph which shows the test result 2 (test body with a low washing pattern density) of the compression axis | shaft distortion | strain of a concrete surface, and a heat-cooling repetition number. It is a graph which shows the test result 3 (test body of a standard washing pattern) of the compression axis | shaft distortion | strain of a concrete surface, and a heat-cooling repetition number. It is a measured value of the roughening depth for each experimental parameter based on the tile compression axis strain following test. The quality control apparatus of the concrete surface shape by a 1st modification, (a) is a front side perspective view, (b) is a back side perspective view, (c) is a schematic diagram of the measuring method.

The present invention is a quality control device that measures and determines the required roughening depth on a concrete base surface for tiled use. Specifically, using a concrete surface shape quality control device, measure the rough surface depth of the concrete base surface and compare it with the required limit value (threshold value) of the rough surface depth to prevent tile peeling. Thus, it is a quality control device for the concrete surface shape that determines the presence or absence of tile peeling.
Specifically, the quality control device is intended to measure the roughening depth of the concrete surface by extending one depth measurement unit from the casing constituting the device for the roughening portion of the concrete base surface. There is a form (FIG. 1) and a first modification (FIG. 13) in which a plurality of depth measuring units are extended from the housing and at the same time the roughening depths at a plurality of locations are measured.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1A is a perspective view of a quality control device 1 for a concrete surface shape in an embodiment of the present invention, and FIG. 1B is an explanatory diagram of the quality control device 1. The quality control device 1 manages the roughening depth of the concrete base surface for tiling. The quality management device 1 includes a housing 2, an input unit 4 (4 </ b> A, 4 </ b> B, 4 </ b> C) provided on the housing 2, and a determination display unit 5.
The housing 2 preferably has a size that can be grasped with one hand, and a part of the housing 2 projects thinly in the downward direction X in FIG. 1A to form a projecting portion 2a. .

The quality management device 1 includes a depth measurement unit 3. In the present embodiment, the depth measuring unit 3 is formed in a needle shape. The depth measuring unit 3 is stored inside the housing 2 when the quality control device 1 is not used. When the quality control device 1 is used, the depth measuring unit 3 receives an instruction from the control unit 6 (described later) that has received an operation on the input unit 4 (described later), and the tip of the protruding portion 2 a of the housing 2. It protrudes from the surface 2b and extends in the protruding direction X of the protruding portion 2a, and stops extending when the tip 3a of the depth measuring unit 3 comes into contact with some object. The depth measurement unit 3 measures the projection length L of the depth measurement unit 3 when the stretching is stopped, that is, the distance from the tip surface 2b of the projection unit 2a to the tip 3a of the depth measurement unit 3. To the control unit 6.
As shown in FIG. 1B, the surface 20 a of the concrete base 20 before the tile is stretched increases the bonding strength between the tile and the concrete base 20 to prevent peeling and peeling of the tile. Further, the surface is roughened by an ultra-high pressure water cleaning method or the like, thereby forming irregularities.
The quality control device 1 is provided so that the front end surface 2b of the projecting portion 2a of the housing 2 is in contact with the tip of the convex portion of the surface 20a of the concrete base 20, that is, the projecting end 20b. When the 3 is operated so as to protrude from the protruding portion 2a, the depth from the protruding end 20b of the surface 20a of the concrete base 20 at the position where the quality control device 1 is provided is measured as the protruding length L. Is done.
Thus, the depth measuring unit 3 measures the roughening depth of the surface 20a of the concrete foundation 20.

The input unit 4 is a button in the present embodiment. The input unit 4 includes a first button 4A, a second button 4B, and a third button 4C.
The first button 4A is a button for instructing the start of measurement. When this button is pressed, the quality control device 1 causes the depth measuring unit 3 to protrude from the distal end surface 2b of the protruding portion 2a, and the depth of roughening is set. Start measurement.
The second button 4B is a button for selecting the number of times of roughening depth measurement. There is variation in the depth of the deepest portion 20c with respect to the protrusion 20b of the unevenness of the concrete base 20. Further, depending on the installation position of the quality control device 1, the tip 3 a of the depth measurement unit 3 does not always reach the uneven deepest part 20 c of the surface 20 a of the concrete foundation 20. For example, as shown in FIG. 1B, the tip 3a may come into contact with the inclined surface 20d that is continuous between the protrusion 20b and the deepest portion 20c. Therefore, when measuring the roughening depth of the surface 20a of the concrete foundation 20, after measuring the roughening depth a plurality of times at different positions, the average value is calculated, and this average value is calculated. The final measurement result is preferable. The second button 4B selects the number of times of measurement, for example, 3, 5, 9, etc.
The third button 4C is a button for selecting the concrete strength of the concrete foundation 20 to be measured, a cleaning pattern by the ultra-high pressure water cleaning method, and the like. As will be described later, the measurement result of the roughening depth is compared with a preset threshold value to determine the quality of the roughening depth. The degree of difficulty of tile peeling and peeling depends on external factors such as the concrete strength of the concrete foundation 20 and the cleaning pattern by the ultra-high pressure water cleaning method. The form differs depending on these external factors. That is, when an external factor is selected by the third button 4C, an appropriate threshold value used for quality determination is selected.
The input value set in the input unit 4 is transmitted to the control unit 6 stored in the housing 2.

  The quality management apparatus 1 includes a control unit 6 that is not shown in FIG. The control unit 6 controls the operation of the quality management device 1 and is realized by a semiconductor integrated circuit or the like stored in the housing 2. FIG. 2 shows a block diagram of the control unit 6. The control unit 6 includes a threshold setting unit 7, a threshold table 8, a threshold calculation unit 9, a depth calculation unit 10, and a quality determination unit 11.

First, the threshold value table 8 of the required roughening depth of the concrete base surface will be described with reference to FIG. FIG. 3 is an example of the threshold table 8. The threshold value is a limit value of the roughening depth at which the adhesive interface breaks between the tile and the surface 20a of the concrete base 20. As described above, the degree of difficulty of peeling and peeling off the tile depends on external factors such as the concrete strength of the concrete base 20 and the cleaning pattern by the ultra-high pressure water cleaning method. Accordingly, different threshold values are set as a table.
The item of “ultra-high pressure water cleaning” indicates the type of cleaning pattern by the ultra-high pressure water cleaning method. FIG. 4 is an explanatory diagram of a cleaning pattern by the ultra-high pressure water cleaning method. In the cleaning pattern of FIG. 4 (a), cleaning is performed linearly by an ultra-high pressure water cleaning method, the “cleaning pattern” in FIG. 3 is “linear”, and the “roughness density” is “standard type”. Corresponds to the item. The cleaning pattern in FIG. 4B is linear as in FIG. 4A, but the cleaning amount is smaller than in FIG. 4A, and the “cleaning pattern” in FIG. 3 is “linear”. In this case, the “roughness density” corresponds to the item of “low density type”. In the cleaning pattern of FIG. 4C, the cleaning is performed in a spiral shape, the “cleaning pattern” in FIG. 3 corresponds to the item “helical”, and the “roughness density” corresponds to the “standard type” item. The cleaning pattern of FIG. 4D is spiral like FIG. 4C, but the cleaning amount is smaller than that of FIG. 4C, and the “cleaning pattern” of FIG. 3 is “spiral”. In this case, the “roughness density” corresponds to the item of “low density type”.
Here, the standard type of roughening density means that one or more clearly-identified eyes can be confirmed in a 10-mm square cell when a concrete surface cut mark is measured using a 10-mm square plastic sheet. The breaking density was used. Therefore, when the cutting trace does not exist in the 10 mm square mesh, a low standard type roughening density was adopted.
The item “concrete compressive strength” indicates the type depending on the concrete compressive strength. In the present embodiment, “32.1 N / mm ² ”, “34.2 N / mm ² ”, and “60.6 N / Threshold values are set for the three types of concrete strength “mm ² ”.
In Fig. 3, the numerical value shown at the intersection of each item of "Ultra High Pressure Water Cleaning" and each item of "Concrete Compressive Strength" is the selected cleaning pattern and concrete compressive strength by the corresponding ultra high pressure water cleaning method. It is a threshold in the case where it is done. For example, the threshold when “ultra-high pressure water cleaning” is “linear” and “standard” and “concrete compressive strength” is “32.1 N / mm ² ” is 257.1 μm.

  The threshold setting unit 7 shown in FIG. 2 sets thresholds in the threshold table 8 in advance before measuring the roughening depth and determining the quality. The threshold value may be set manually by the input unit 4. Alternatively, the threshold value table 8 itself shown in FIG. 3 is received from the outside of the quality management device 1 via a communication unit (not shown) provided in the quality management device 1 and stored in the control unit 6, so that the threshold value is set. It does not matter if it is set.

The threshold value calculation unit 9 receives information related to the concrete strength of the concrete base 20 to be measured, the cleaning pattern by the ultra-high pressure water cleaning method, and the like, which are input by the input unit 4, particularly the third button 4C. Based on the received information, the threshold calculation unit 9 calculates a threshold most suitable for the measurement target from the threshold table 8.
As shown in FIG. 3, particularly in the item of concrete strength, the threshold value table 8 does not necessarily have a column that matches the concrete strength of the concrete base 20 to be measured. In such a case, the threshold value calculation unit 9 is registered in the threshold value table 8, and the concrete strength value between the two concrete strength values before and after the concrete strength of the concrete base 20 to be measured is close to the concrete strength value. For example, a threshold value corresponding to the concrete strength of the concrete foundation 20 to be measured is calculated.

Specifically, FIG. 3 is an example of a threshold table of the required roughening depth of the concrete base surface by a tile compression axis strain follow-up test (described later) using a tile post-concrete concrete prism test piece. The threshold value is a roughening depth (μm) measured by the quality control device for the concrete surface shape according to the present invention, and the threshold value table is constituted by three kinds of parameters. The first parameter is concrete compressive strength, the range is 32.1 N / mm ^{2 to} 60.6 N / mm ² , and the second parameter is a cleaning pattern of ultra-high pressure water cleaning, linear type or spiral type The third parameter is the roughening density by ultra-high pressure water cleaning, and is classified into a standard type or a low density type. The shaded portion in the table is an example of the roughing depth obtained by combining the parameters causing the tile peeling, and the tile peeling occurs even if the threshold in the table is secured. Additional testing is needed in the future.
Therefore, the threshold value using the concrete strength as a parameter interpolates each threshold value when the concrete strength is in the range of 32.1 N / mm ^{2 to} 60.6 N / mm ² , and 32.1 N / mm below 32.1 N / mm ^2. Referring to the ^second threshold value, the 60.6N / mm ² or more with reference to the threshold of 60.6N / mm ^2.
For example, with respect to the threshold value table 8 shown in FIG. 3, ultra-high pressure water cleaning is a linear standard cleaning pattern, and the concrete strength is 47.4 N / mm which is intermediate between 34.2 N / mm ² and 60.6 N / mm ^2. in the case of washing with a value of ^2, the threshold value calculation unit 9, a threshold 201.4μm in the case of 34.2N / mm ^2, is the intermediate value between the threshold 210.6μm in the case of 60.6N / mm ² 206.0 μm is calculated as the threshold value.
The threshold calculation unit 9 transmits the threshold calculated as described above to the quality determination unit 11 described later.

The depth calculation unit 10 receives the number of times of measuring the roughening depth input by the input unit 4, particularly the second button 4B.
The depth calculation unit 10 transmits an instruction to the depth measurement unit 3 to measure the roughening depth of the surface 20 a of the concrete foundation 20, and receives the measurement result from the depth measurement unit 3.
The depth calculation unit 10 repeats the transmission of the measurement instruction and the reception of the measurement result by the designated number of measurements, and stores the measurement value of the roughening depth for the designated number of measurements inside. Thereafter, the depth calculation unit 10 calculates an average value of the measurement values for the stored number of measurements, and transmits the average value to the quality determination unit 11 described next.

The quality determination unit 11 receives the threshold value from the threshold value calculation unit 9 and the average value of the measurement values from the depth calculation unit 10.
The quality determination unit 11 compares these values. In other words, the quality determination unit 11 has a measured value of the rough surface depth of the surface 20a of the concrete foundation 20 measured by the depth measuring unit 3, more strictly, an average of the measured values calculated by the depth calculating unit 10. It is determined whether the value is less than a preset threshold value or greater.
As described above, the threshold value is a limit value of the roughening depth at which the adhesive interface breakage occurs between the tile and the surface 20a of the concrete foundation 20. Therefore, when the measured value is less than the threshold value, the quality determination unit 11 determines that further roughing water cleaning is necessary so that the roughening depth is not sufficient and sufficient roughening depth is obtained. If it is equal to or greater than the threshold, it is determined that the roughing depth is deep enough to prevent the tile from peeling off and peeling off, and that the ultra-high pressure water cleaning may be terminated.
The quality determination unit 11 transmits the determination result to the determination display unit 5.

The determination display unit 5 is a display device such as a liquid crystal display. The determination display unit 5 receives the determination result from the quality determination unit 11 and displays it.
In particular, the depth measuring unit 3 of the quality control device 1 as described above may be manufactured based on a portable surface contour measuring instrument generally called a surface contour gauge or the like.

  Next, a method for roughening the concrete surface using the concrete surface shape quality control device 1 will be described with reference to FIGS. 1 and 2.

First, a threshold value is set in advance in the threshold value table 8 by the threshold value setting unit 7 before measuring the roughening depth and determining the quality.
Next, the operator inputs information regarding the concrete strength of the concrete foundation 20 to be measured, the cleaning pattern by the ultra-high pressure water cleaning method, and the like by the input unit 4, particularly the third button 4 </ b> C. The input information is transmitted to the threshold value calculation unit 9 of the control unit 6. The threshold calculation unit 9 receives these pieces of information, and calculates a threshold most suitable for the measurement target from the threshold table 8 based on the received information. The threshold calculation unit 9 transmits the calculated threshold to the quality determination unit 11 described later.
Further, the operator selects the number of times of measuring the roughening depth by using the input unit 4, particularly the second button 4B. The input information is transmitted to the depth calculation unit 10 of the control unit 6.

Thereafter, the operator brings the front end surface 2b of the protruding portion 2a of the housing 2 into contact with the surface 20a of the concrete base 20 before the tile is stretched, and presses the input unit 4, particularly the first button 4A. Then, the depth calculation unit 10 transmits an instruction to the depth measurement unit 3 to measure the roughening depth of the surface 20 a of the concrete foundation 20. The depth measurement unit 3 receives the instruction from the depth calculation unit 10, protrudes from the distal end surface 2 b of the protruding portion 2 a of the housing 2, extends in the protruding direction X of the protruding portion 2 a, and When the tip 3a of the height measuring unit 3 comes into contact with the surface 20a of the concrete substrate 20, the stretching is stopped. The depth measurement unit 3 measures the protrusion length L of the depth measurement unit 3 when this stretching is stopped, and transmits the measurement to the depth calculation unit 10. The depth calculation unit 10 receives the measurement result from the depth measurement unit 3 and stores it internally as a roughening depth value.
After this measurement, the operator brings the tip surface 2b of the protruding portion 2a of the housing 2 into contact with the surface 20a of the concrete base 20 at a position different from the previous measurement position, and the roughening depth at that position. The thickness is measured as described above. The operator performs this measurement work for the number of times selected by the second button 4B while changing the measurement position on the surface 20a of the concrete foundation 20. As a result, inside the depth calculation unit 10, the measurement values of the roughening depth for the number of times of measurement selected by the second button 4B at different positions on the surface 20a of the concrete base 20 are stored.
After the measurement work is completed, the depth calculation unit 10 calculates an average value of the measurement values for the stored number of measurements and transmits the average value to the quality determination unit 11.

The quality determination unit 11 receives the threshold value from the threshold value calculation unit 9 and the average value of the measurement values from the depth calculation unit 10.
The quality determination unit 11 compares these values. That is, the quality determination unit 11 determines whether the measured value of the rough surface depth of the surface 20a of the concrete foundation 20 measured by the depth measurement unit 3 is less than a preset threshold value or more than a threshold value. If the measured value is less than the threshold value, the quality determination unit 11 determines that the roughening depth is not sufficient, and that further ultra-high pressure water cleaning is necessary to obtain a sufficient roughening depth, If it is equal to or greater than the threshold value, it is determined that the roughening depth is deep enough to prevent peeling and peeling of the tile, and the ultra-high pressure water cleaning operation may be terminated.
The quality determination unit 11 transmits the determination result to the determination display unit 5.
The determination display unit 5 receives the determination result from the quality determination unit 11 and displays it.
The operator refers to the determination result of the determination display unit 5, and when the determination that the ultra-high pressure water cleaning operation may be terminated is displayed, the ultra-high pressure water cleaning operation is terminated. Otherwise, until the sufficient roughening depth is obtained and the determination display unit 5 indicates that the super high pressure water cleaning operation may be terminated, The measurement of the roughening depth by the quality control device 1 is repeatedly performed.

  In order to display an appropriate determination result on the determination display unit 5 in the concrete surface shape quality control device 1 and the method of roughening the concrete surface using the concrete surface shape quality control device 1 as already described. In this case, the quality control device 1 needs to have sufficient measurement accuracy, and a threshold value that serves as a criterion for quality judgment of the roughening depth needs to be appropriately determined. Hereinafter, measurement accuracy of the quality management device 1 and determination of an appropriate threshold will be described.

Regarding the measurement accuracy of the quality control device 1, the measurement result by the laser displacement meter capable of accurately observing the condition of the concrete surface was compared with the measurement result by the quality control device 1.
Specifically, the concrete base surface subjected to ultra-high pressure water cleaning was measured with a laser displacement meter, and JIS B 0601 (product geometric property specification (GPS)-surface property: contour curve method-terminology, definition and surface property) The arithmetic average roughness Ra (μm) defined in the parameter) was calculated. At the same time, the quality control device 1 was used to measure the roughening depth (μm) of the concrete base surface subjected to the ultra-high pressure water cleaning at 15 different positions, and the average value was calculated. Then, the correlation of arithmetic average roughness Ra (micrometer) and the average value of roughening depth was calculated | required.
In FIG. 5, the graph which plotted both the measurement results regarding a some test body is shown. The horizontal axis, that is, the x-axis is the arithmetic average roughness Ra (μm) measured by a laser displacement meter, and the vertical axis, that is, the y-axis, is the roughening depth (μm) measured by the quality control device 1. The correlation coefficient r of these values is 0.865, and the two are highly correlated with each other. That is, the quality control device 1 can provide a sufficient accuracy corresponding to the laser displacement meter for the roughening depth of the concrete base. It was found that can be measured by.
In FIG. 5, a line 40 is provided at the center position of all plotted measurement results, and is represented by the following equation.

(Equation 1)
y = 1.963x (1)

Next, a method for determining an appropriate threshold will be described.
In this embodiment, a strain followability test is performed using a tiled test body in which tiles are bonded to the concrete surface, and the threshold is determined based on the result. FIG. 6A shows a front view of the specimen 30 and FIG. 6B shows a plan view of the specimen 30.
The test body 30 was manufactured according to the following procedure. First, the concrete 33 was driven into a 100 × 100 × 400 mm mold, and after a predetermined age, the surface 33a of the concrete 33 was roughened by an ultra-high pressure water cleaning method. Then, the water absorption adjusting material was applied and cured for 2 weeks, and the tile 32 was stretched with mosaic tiles through the stretched mortar 31.
Strain gauges 34 were installed on the surface 33 a of the concrete 33 and the surface of the tile 32.
As the test body 30, the type shown in FIG. 7 was prepared. The items “cleaning pattern” and “roughness density” of “ultra-high pressure water cleaning” are the same as those in the threshold table 8 described with reference to FIG. The item “cleaning pattern” of “none” indicates a specimen that is not roughened. The item of “pressure (MPa)” in “ultra-high pressure water cleaning” is a discharge pressure of water in the ultra-high pressure water cleaning. In the item “number of test specimens”, the number of test specimens according to each specification is described. For specimens that are subjected to the strain followability test immediately after the tile 32 is stretched, the “initial” item is subjected to a repeated cooling test as described below after the tile 32 is stretched, and then the strain followability test is performed. The number of test specimens is counted for each of the test specimens in the “Cooling and Cooling Repeat” item.

As described above, with respect to some of the test bodies 30, after the tiles 32 are stretched, a repeated cooling test is performed, and then a strain follow-up test is performed.
The cold-heat repeated test conforms to the hot-cold repeated resistance test of the Japan Society for Finishings Technology M-101 (quality standard for water absorption adjusting material for cement mortar coating). The test body 30 is irradiated with an infrared lamp for 10 minutes in an environment of 70 ° C. and then sprinkled at a water spray rate of 6 l / min for 15 minutes, and this test for one cycle is performed for 300 cycles, or , 600 cycles were repeated.

For each test body 30 manufactured as described above, a force test was performed in which compression was performed using a 3MN testing machine in the vertical direction in FIG. The load speed was about 3 KN per second. FIG. 8 shows a graph for explaining the procedure for applying force to the test body 30.
As shown in FIG. 8, the cycle of gradually increasing the compressive load and reducing the compressive load after the compressive strain on the concrete surface reaches 200μ is repeated three times, and the peeling condition of the tile finished surface is determined by percussion. inspect. Thereafter, a cycle of gradually increasing the compressive load and reducing the compressive load after the compression axial strain on the concrete surface reaches 400 μ is repeated three times to inspect the peeling condition of the tile finished surface. Further, a cycle in which the compressive load is gradually increased and the compressive load is reduced after the compressive axial strain on the concrete surface reaches 600 μ is repeated three times to inspect the peeling condition of the tile finished surface. Finally, the compression load is increased again, and until the tile 32 is lifted or until the compression load reaches the concrete compression strength, the compression axis of the concrete surface when the tile 32 is peeled off is applied. The strain was measured with a strain gauge 34.

FIG. 9 is a graph showing a result of a strain followability test performed on the test body 30 on which the tile 32 is stretched without performing the ultra-high pressure water cleaning on the surface 20a of the concrete base 20. The horizontal axis represents the number of cycles of the cold-heat repetition test, and the vertical axis represents the value of the compressive axial strain of the concrete surface measured by the strain gauge 34 in the strain followability test. In FIG. 9, lines 50, 51, and 52 are graphs when the concrete strength is 32.1 N / mm ² , 34.2 N / mm ² , and 60.6 N / mm ² , respectively.
For example, the point 52a on the line 52 corresponds to the test body 30 with the tile 32 stretched without performing ultra-high pressure water cleaning on the surface 20a of the concrete base 20 having a concrete strength of 60.6 N / mm ^2. In addition, the case where the strain followability test is performed without performing the cooling and heating test after the tile 32 is shown is shown. Further, for example, the point 51b on the line 51 is a specimen 30 in which the tile 32 is stretched without performing ultra-high pressure water cleaning on the surface 20a of the concrete base 20 having a concrete strength of 34.2 N / mm ^2. On the other hand, after the tile 32 is stretched, 300 cycles of the cooling and heating test are performed, and the strain followability test is performed.

FIG. 10 shows the result of carrying out the strain followability test on the test body 30 on which the tile 32 is stretched by performing ultra-high pressure water cleaning with a roughening density on the surface 20 a of the concrete base 20. It is a graph which shows. The horizontal and vertical axes are the same as in FIG. In FIG. 10, the lines 60, 61, and 62 are linear in the cleaning pattern when the concrete strength is 32.1 N / mm ² , 34.2 N / mm ² , and 60.6 N / mm ² , respectively. Thus, the lines 63, 64, and 65 are concrete strengths of 32.1 N / mm ² , 34.2 N / mm ² , and 60.6 N / mm ^{2, respectively.} In this case, the ultra high pressure water cleaning is performed so that the cleaning pattern is spiral.

FIG. 11 shows a result of a strain followability test performed on the test body 30 on which the tiles 32 are stretched by cleaning the surface 20a of the concrete base 20 with a standardized roughing density and performing ultra-high pressure water cleaning. It is a graph which shows. The horizontal and vertical axes are the same as in FIG. In FIG. 11, the lines 70, 71, and 72 have a linear cleaning pattern when the concrete strength is 32.1 N / mm ² , 34.2 N / mm ² , and 60.6 N / mm ² , respectively. Thus, the lines 73, 74, and 75 are graphs when the ultra-high pressure water cleaning is performed, and the concrete strengths are 32.1 N / mm ² , 34.2 N / mm ² , and 60.6 N / mm ^{2, respectively.} In this case, the ultra high pressure water cleaning is performed so that the cleaning pattern is spiral.

FIG. 12 is a table summarizing the roughening depth of the concrete base surface measured by the quality control device 1 for the test body 30 on which the strain followability test of FIGS. 9, 10 and 11 was performed.
The item of “ultra-high pressure water cleaning” indicates the type of cleaning pattern by the ultra-high pressure water cleaning method. The items “cleaning pattern” and “roughness density” are the same as those in FIG. The item in which the item of “ultra-high pressure water cleaning” is indicated as “none” is the test in which the tile 32 is stretched without performing the ultra-high pressure water cleaning on the surface 20a of the concrete base 20 in FIG. This corresponds to the result of the strain followability test performed on the body 30. The item of “pressure” indicates a discharge pressure in the ultra-high pressure water cleaning method, and indicates a water pressure of 150 MPa to 200 MPa.
The item “number of cycles” indicates the number of cycles of the cooling / heating cycle test.

For example, the point 52a on the line 52 in FIG. 9 is a specimen in which the tile 32 is stretched without performing ultra-high pressure water cleaning on the surface 20a of the concrete base 20 having a concrete strength of 60.6 N / mm ^2. 30 is a case where a strain follow-up test is carried out without carrying out a cooling and repetitive test after the tile 32 is stretched, and measurement of the roughening depth by the quality control device 1 of the test specimen 30 corresponding thereto. It can be seen that the result was 35.1 μm. Incidentally, in this case, since the ultra-high pressure water cleaning is not performed, the above value indicates the degree of unevenness originally provided on the surface 20a of the concrete base 20.
Similarly, the point 75c on the line 75 in FIG. 11 exceeds the standard level so that the cleaning pattern becomes spiral with respect to the surface 20a of the concrete foundation 20 having a concrete strength of 60.6 N / mm ^2. This is a case in which a strain follow-up test is performed after performing a 600-cycle repetitive cooling test on the test body 30 that has been subjected to high-pressure water washing, after the tile 32 is stretched. It can be seen that the measurement result of the roughening depth by the management device 1 was 183.5 μm.
Moreover, the shaded portion in the table is an example of the roughening depth combining the parameters that caused the tile peeling, and the tile was peeled even if the threshold in the table was secured. Therefore, it was confirmed from the result of this strain followability test that the tile stretched on the concrete surface without performing the ultra-high pressure water cleaning has a high possibility of peeling after a certain period of time. Moreover, in concrete with a concrete strength of 60.6 N / mm ² , it can be confirmed that if there are few cutting traces on the concrete surface so that the roughening density corresponds to a low density type, the tile is likely to peel off. It was.

From the table summarized as FIG. 12 as described above, the threshold table 8 shown in FIG. 3 is an excerpt of the result of the ultrahigh pressure water cleaning being performed and the number of cycles of the cooling and heating test being 600. . That is, by using the threshold value table 8 of FIG. 3, for example, the surface of the concrete base 20 having a concrete strength of 60.6 N / mm ² is superstandard so that the cleaning pattern becomes spiral. In the case of carrying out the high-pressure water washing, it is understood that the super-high pressure water washing may be carried out so that the roughening depth is 183.5 μm or more. Since the corresponding point 75c shown in FIG. 11 is shown at a position of about 1300 μ in the y-axis, the tile 32 can withstand a strain of about 1300 μ by performing the ultra-high pressure water cleaning as described above. Can be stretched.

Here, in FIGS. 9, 10, and 11, a line T indicated by a one-dot chain line is provided at a position where the compressive axial strain on the concrete surface is, for example, 500 μm. Based on the research results of Non-Patent Document 1, the line T is judged to be excellent in strain followability, with no separation observed at the interface between concrete and pasting mortar and between the pasting mortar and the tile back surface. It was set to 500 μ which is the compression axial strain of the concrete. Measurement of the roughening depth corresponding to the results of the experiment in which the compression axis strain of the concrete surface does not reach the line T, that is, the point 62c in FIG. Values and thresholds, for example a value of 35.0 μm, are shown with a pattern. In such a case where the result of the strain followability test is lower than a certain value, for example, at a point 62c, the test body 30 in which the roughening depth is sufficiently deeper than 35.0 μm is provided. It is desirable to create again and repeat the test until the result of the strain is more appropriate, that is, a value of 500 μm or more, to determine an appropriate threshold.
Therefore, in the relationship between the compression surface strain of the concrete surface and the number of cycles of the cooling and heating test (FIGS. 9 to 11), the compression surface strain of the concrete surface shown on the vertical axis is the compression of the concrete when peeling occurs on the tile. A specimen having axial strain and whose compressive axial strain on the concrete surface is lower than the line T is judged to have low peel resistance.

  Next, the effect of the quality control apparatus 1 for the concrete surface shape will be described.

According to the above configuration, since the roughening depth of the surface 20a of the concrete base 20 is directly measured with respect to the surface 20a of the concrete base 20 by the depth measuring unit 3, the mold to the metal foil is used. The accuracy of the measured value is not impaired by indirect operations such as pushing. Therefore, the roughening depth can be measured with sufficient accuracy.
In addition, as described above, the roughening depth can be directly measured without using an indirect work such as embossing on the metal foil, so that the quality determination work including the measurement is easy.
In addition, the measurement result is compared with a preset threshold value to determine the quality, and the result is displayed on the determination display unit 5. It is possible to implement. The quality determination is quantitatively performed by comparing the measured value of the roughening depth with a threshold value. Therefore, it is possible to reliably carry out the entire quality determination work including measurement in a short time and without requiring a determination skill relating to the roughening depth.

Moreover, as a threshold value, as described above, the limit value of the roughening depth at which the adhesive interface fracture occurs in the strain followability test using the tiled specimen 30 in which the tile 32 is bonded to the concrete surface. It is recorded as a database such as the threshold value table 8 shown in FIG. 3, and the roughening depth of the surface 20a of the concrete foundation 20 is managed so as to be equal to or greater than the threshold value, thereby preventing the tile 32 from peeling off. it can.
Further, as described above, the threshold value table 8 shown in FIG. 3 is an excerpt of the results of 600 cycles of the repeated cooling and heating test from the results of the strain followability test shown in FIG. Based on this, the quality of the roughening depth is determined. Therefore, not only immediately after the tile 32 is stretched but also after the passage of time, it is possible to reliably prevent the tile 32 from peeling off.

  In addition, if a laser displacement meter is used, it is possible to accurately observe the condition of the concrete surface as described above, but the laser displacement meter is not easy to carry. It is difficult to take out a laser displacement meter and measure the roughening depth of the concrete surface with the laser displacement meter. On the other hand, in the quality control apparatus 1 described above, the structure is simple and can be manufactured in a portable size. Therefore, the quality control apparatus 1 is carried on a tiled site, and the roughening depth of the concrete surface on the site. It is suitable for measuring. That is, according to the quality control device 1, it is possible to measure the roughening depth with high accuracy regardless of the place.

(First Modification of Embodiment)
Next, the 1st modification of the quality control apparatus 1 of the concrete surface shape shown as the said embodiment is demonstrated using FIG. 13A is a front perspective view of the quality management device 80 according to the first modification, FIG. 13B is a rear perspective view of the quality management device 80, and FIG. 13C is a quality management device. 80 is an explanatory diagram of 80. FIG. The quality management device 80 according to the first modification is different from the quality management device 1 according to the above-described embodiment in that the quality management device 80 includes a plurality of depth measurement units 83.
The casing 82 of the quality management device 80 is formed in a plate shape. An input unit 84 and a determination display unit 85 similar to those in the above embodiment are provided on the front surface 82c of the housing 82.
A plurality of projecting portions 82a are provided on the rear surface 82d of the housing 82 so as to project from the rear surface 82d. In the present embodiment, each protrusion 82a is formed in a columnar shape, and the tip end surface 82b of the protrusion 82a is provided so as to be substantially parallel to the back surface 82d.
In the same manner as in the above embodiment, each of the protrusions 82a is provided with a depth measurement part 83 so as to protrude from the front end surface 82b during use and further extend in the protruding direction of the protrusion 82a.
As shown in FIG. 13C, the quality control device 80 makes the rear surface 82d of the housing 82 face the surface 20a of the concrete base 20 so that the front end surface 82b of each protrusion 82a is in contact with the surface 20a. It is provided and used. In order to facilitate this operation, a grip 90 is provided on the front surface 82c of the housing 82.

  It goes without saying that the first modification has the same effect as that of the above embodiment. In the first modified example, in particular, the average roughening depth of the concrete surface can be measured in a short time by measuring the roughening depth at a plurality of positions on the surface 20a of the concrete foundation 20 in one operation. You can get it. Therefore, it is possible to quantitatively carry out the entire quality judgment work of the rough surface depth of the concrete foundation surface for tile installation in a short time.

(Second Modification of Embodiment)
Next, the 2nd modification of the quality control apparatus 1 of the concrete surface shape shown as the said embodiment is demonstrated. The quality management apparatus of the second modification is different from the quality management apparatus 1 in the above embodiment in the method of creating a threshold table.
In the above embodiment, since the roughening depth of the concrete base surface is measured by the quality control device 1 in the tiled site, the threshold value set in the threshold value table 8 is the roughening depth of each specimen 30. The result of measuring the thickness by the quality control device 1 is used. In the second modification, instead of this, a value based on the result of measuring the roughening depth of each specimen 30 with a laser displacement meter is registered in the threshold table as a threshold.
As described with reference to FIG. 5, the arithmetic average roughness measured by the laser displacement meter and the roughening depth measured by the quality control device 1 on the concrete base surface are highly correlated with each other. It is possible to think in correspondence with the relationship as in Equation 1. Therefore, in the second modification, the roughening depth of each test body 30 is measured with a laser displacement meter, and the result is close to the reciprocal of 1.1963, which is the coefficient in Equation 1, and is 0.8 or more and 0. The coefficient is less than .9, more specifically, for example, multiplied by a value such as 0.836, and converted into a threshold value when measured by the depth measuring unit, and this is set in the threshold value table.

  It goes without saying that the second modification has the same effect as that of the above embodiment. In the second modification, the condition of the concrete ground surface of the test specimen is observed and measured by a laser displacement meter that can accurately observe the condition of the concrete surface, so that the accuracy of the threshold can be increased. Therefore, the determination accuracy by the quality control device can be further increased.

  In addition, the quality control apparatus 1 of the concrete surface shape of this invention is not limited to the above-mentioned embodiment and each modification demonstrated with reference to drawings, In the technical scope, there are various other modifications. Conceivable.

For example, in the above embodiment and each modification, the test results are summarized as shown in FIG. 12, and the threshold pressure table 8 shown in FIG. However, a threshold value table 8 using another value such as “150 MPa” as shown in FIG. 7 may be separately manufactured, and the threshold value calculation unit 9 may change the output threshold value depending on the discharge pressure. It goes without saying that it is good. The same applies to other items not described in FIG. 12, such as the age of the concrete.
In ultra-high pressure water cleaning, there are various options other than discharge pressure and cleaning patterns, such as a processing speed of 3 minutes / m ² or 4 minutes / m ² and a nozzle hole number of 12 or 7 holes. Therefore, the setting of the threshold value table 8 and the processing of the threshold value calculation unit 9 may be changed so that different threshold values are output based on the processing speed, the number of nozzle holes, and the like.

Moreover, in the said embodiment and each modification, the threshold value calculation part 9 is based on the threshold value table 8 set beforehand, About two concrete strength values before and behind the concrete strength of the concrete foundation | substrate 20 used as a measuring object, For example, a threshold value is calculated based on a mathematical formula that complements the concrete strength value between them linearly, and the threshold value setting / storing method in the quality management device 1 and the threshold value by the threshold value calculation unit 9 are calculated. The calculation of is not limited to this.
For example, if the threshold value can be expressed by any function having a concrete strength value or a cleaning pattern by the ultra-high pressure water cleaning method as an input, the function is stored in the control unit 6 instead of the threshold value table 8, The threshold value calculation unit 9 may calculate the threshold value by inputting an appropriate value for this function.
Alternatively, the processing is simplified, for example, the threshold calculation unit 9 searches for the concrete strength value closest to the concrete strength of the concrete base 20 to be measured in the threshold table 8 without performing the linear interpolation as described above. The threshold value corresponding to the concrete strength value may be output as it is.

  Other than this, as long as the gist of the present invention is not deviated, it is possible to select the configuration described in the above embodiment and each modification, or to appropriately change to another configuration.

DESCRIPTION OF SYMBOLS 1 Quality control apparatus 20 Concrete base 2 Case 20a Surface 2a Protrusion part 80 Quality control apparatus 2b Tip surface 82 Case 3 Depth measurement part 82a Protrusion part 3a Tip 82b Tip face 4 Input part 83 Depth measurement part 5 Determination display part 84 Input unit 6 Control unit 85 Determination display unit 7 Threshold setting unit 90 Grip unit 8 Threshold table
9 Threshold calculation unit
10 Depth calculation part 11 Quality judgment part

Claims (3)

A quality control device for controlling the roughening depth of the concrete base surface for tiling,
A depth measurement unit for measuring the roughening depth of the concrete base surface;
The measurement value of the rough surface depth of the concrete foundation surface measured by the depth measuring unit is less than a preset threshold value, or a rough depth quality determining unit for determining whether the threshold value or more,
A roughening depth judgment display section for displaying the roughening depth quality judgment result,
A quality control device for the shape of a concrete surface, comprising:   2. The quality control device for concrete surface shape according to claim 1, wherein the threshold value is a limit value of a roughening depth at which an adhesive interface breakage occurs between the tile and the concrete base surface.   The quality control apparatus of the concrete surface shape of Claim 1 or 2 provided with the said some depth measurement part.

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