The schmidt concrete test hammer with improved workability

Abstract

The present invention has a total of 20 striking rods (200) installed on the front of the main body (100), and It is characterized by measuring the rebound hardness at once by pressing a total of 20 rods (200) against the concrete surface (10). It is characterized by being able to perform a Schmidt hammer test without drawing a total of 20 hitting point grids (20) by separate manual work, The above tapping rod (200) is, The present invention provides an improved Schmidt hammer with improved constructability, characterized in that the impact pressure is controlled through an automatic pressure injection device (300) installed on the main body (100).

Description

Technology Field

[0001] The present invention relates to a Schmidt hammer used for measuring rebound hardness for safety diagnosis of buildings, etc., and to an improved Schmidt hammer with improved constructability that enables accurate and convenient safety diagnosis of concrete structures while maintaining perpendicularity to the striking surface by eliminating the process of drawing multiple measurement points applied to measure rebound hardness and the process of striking repeatedly. Background Technology

[0002] In general, safety inspections of buildings and civil structures are conducted to protect humans from disasters, and the lifespan of buildings and civil structures is influenced by natural factors such as air temperature, humidity, topography, wind, and location, as well as artificial factors such as lifestyle customs and culture.

[0003] Therefore, although buildings and civil structures should be designed and constructed to adequately withstand slippage, settlement, applied loads, wind, and earthquakes due to these factors, there are many cases where they are inadequately designed and constructed, and they also act as elements that threaten human safety due to various factors.

[0004] Therefore, in such cases, safety diagnoses are conducted item by item, including on-site inspections where engineers visit the site directly, professional overviews, design standards, and basic data; however, it is true that this conventional evaluation is insufficient in terms of ensuring safety, as engineers conduct investigations based on highly subjective and uncertain aspects.

[0005] Figure 1 illustrates various Schmidt hammers currently in use, and

[0006] Figure 2 illustrates a Schmidt hammer test sheet,

[0007] Figures 3 and 4 illustrate a conventional Schmidt hammer test method.

[0008] Management systems and devices for professionally evaluating buildings have been developed and are in use, and in particular, the rebound hardness measurement method is used for inspecting the safety of concrete structures.

[0009] The rebound hardness measurement method described above utilizes a Schmidt hammer, and deviations in the measurement values ​​during the impact test for rebound hardness occur depending on factors such as the presence or absence of protrusion of the aggregate being struck, the distance from the reinforcing bar, and the roughness of the impact surface.

[0010] To reduce the error in such measurements, four parallel horizontal lines are drawn along the horizontal direction on the surface of the concrete to be measured at intervals of 3 cm using chalk and a ruler, and five vertical lines are drawn along the vertical direction at intervals of 3 cm so as to be perpendicular to the horizontal lines, and a Schmidt hammer is placed at the perpendicular points (20 points) of each horizontal and vertical line and struck to measure the hardness inside the concrete structure.

[0011] However, drawing 5 (vertical) × 4 (horizontal) orthogonal lines at 3 cm intervals whenever measuring the hardness of a concrete structure is very cumbersome to work with, relies on manual labor, and has the disadvantage of taking a long time to measure.

[0012] In addition, since the worker applies more than 20 manual strikes, it is difficult to maintain a vertical alignment with the striking surface and difficult to strike with constant pressure.

[0013] Accordingly, the inventor has developed an improved Schmidt hammer with enhanced constructability, which enables accurate and convenient safety diagnosis of concrete structures while maintaining perpendicularity to the striking surface, by eliminating the process of drawing multiple measurement points and repeatedly striking to measure rebound hardness. Prior art literature

[0014] [Reference 1] Republic of Korea Registered Patent No. 10-2000650, 'Optical measurement point display device for Schmidt hammer', July 10, 2019 [Reference 2] Republic of Korea Registered Patent No. 10-2036509, 'Schmidt hammer rebound hardness measurement point location display device for structural safety diagnosis', October 21, 2019 The problem to be solved

[0015] The present invention is presented to resolve the various problems of the prior art as described above.

[0016] The purpose is to provide an improved Schmidt hammer with enhanced constructability that enables accurate and convenient safety diagnosis of concrete structures while maintaining perpendicularity to the impact surface, by eliminating the process of drawing multiple measurement points and repeatedly striking the hammer for safety diagnosis of buildings, etc. means of solving the problem

[0017] To solve the above-mentioned technical problem, the present invention has a total of 20 striking rods (200) installed on the front of the main body (100), and

[0018] It is characterized by measuring the rebound hardness at once by pressing a total of 20 rods (200) against the concrete surface (10).

[0019] It is characterized by being able to perform a Schmidt hammer test without drawing a total of 20 hitting point grids (20) by separate manual work,

[0020] The above tapping rod (200) is,

[0021] The present invention provides an improved Schmidt hammer with improved constructability, characterized in that the impact pressure is controlled through an automatic pressure injection device (300) installed on the main body (100). Effects of the invention

[0022] The present invention relates to a Schmidt hammer used for measuring rebound hardness for safety diagnosis of buildings, etc., and provides an improved Schmidt hammer with enhanced constructability that enables accurate and convenient safety diagnosis of concrete structures while maintaining perpendicularity to the striking surface by eliminating the process of drawing multiple measurement points applied to measure rebound hardness and the process of repeatedly striking. Brief explanation of the drawing

[0023] Figure 1 illustrates various Schmidt hammers currently in use. Figure 2 shows a Schmidt hammer test sheet. Figures 3 and 4 illustrate a conventional Schmidt hammer test method. FIG. 5 illustrates an improved Schmidt hammer with improved constructability according to the present invention. Figure 6 is a cross-sectional view of Figure 5. Specific details for implementing the invention

[0024] The present invention will be explained in more detail below through an embodiment in which the concept of the present invention as described above is preferably implemented, together with the attached drawings.

[0025] Figure 1 illustrates various Schmidt hammers currently in use, and

[0026] Figure 2 shows a Schmidt hammer test sheet.

[0027] Figures 3 and 4 illustrate a conventional Schmidt hammer test method.

[0028] As shown in Fig. 1, the front of the Schmidt hammer appears to have a slightly protruding hammer, and this hammer is equipped with a spring mechanism.

[0029] When a concrete surface is struck with a hammer using this spring device, the degree of bouncing varies depending on the hardness of the surface, so

[0030] It measures rebound hardness by impacting the concrete surface with a hammer and measuring the spring return force.

[0031] In the present invention, the hammer is referred to as a striking rod (20).

[0032] As shown in FIGS. 2 to 4, etc.

[0033] The hitting grid (20) uses a grid with a spacing of 3 cm.

[0034] However, drawing 5 (vertical) × 4 (horizontal) orthogonal lines at 3 cm intervals whenever measuring the hardness of a concrete structure is very cumbersome to work with, relies on manual labor, and has the disadvantage of taking a long time to measure.

[0035] FIG. 5 illustrates an improved Schmidt hammer with improved constructability according to the present invention, and

[0036] Figure 6 is a cross-sectional view of Figure 5.

[0037] As described,

[0038] The improved Schmidt hammer with enhanced constructability of the present invention is,

[0039] A total of 20 striking rods (200) are installed on the front of the main body (100), and

[0040] It is characterized by measuring the rebound hardness at once by pressing a total of 20 rods (200) against the concrete surface (10).

[0041] It is also characterized by the ability to perform the Schmidt hammer test without drawing a total of 20 hitting point grids (20) by hand.

[0042] In addition, the above-mentioned tapping rod (200) is,

[0043] The impact pressure is controlled through an automatic pressure injection device (300) installed on the main body (100).

[0044] The other end of the above-mentioned rod (200) comes into close contact with the concrete surface (10), and

[0045] One end of the above-mentioned rod (200) is,

[0046] It is inserted and installed into the front of the main body (100) and connected to an automatic pressure injection device (300).

[0047] The above automatic pressure injection device (300) is,

[0048] It is configured to include a pressure sensor (not shown), a control device (not shown), and a hydraulic injector (not shown),

[0049] The above hydraulic sprayer functions to apply pressure to one end of the above rod (200) by spraying a fluid, such as a liquid or gas, at a predetermined pressure.

[0050] The above main body (100) is,

[0051] A handle (110) that a worker can hold with both hands;

[0052] A switch (130) for operating the above automatic pressure injection device (300);

[0053] Output unit (150) for printing results;

[0054] A display unit (170) that displays results such as measured rebound hardness;

[0055] It consists of including

[0056] In the present invention, a total of 20 striking rods (200) arranged in 5 rows and 5 columns operate simultaneously in close contact with the concrete surface (10),

[0057] The above-mentioned rod (200) and the above-mentioned concrete surface (10) are automatically kept vertical, so that the measurement precision is maintained at a high level.

[0058] In addition, since the impact pressure is controlled through the above automatic pressure injection device (300), the measurement precision is higher than that of the conventional method when the operator measures by hand.

[0059] And although it was not urbanized,

[0060] A transmission and reception module is installed inside the main body (100) and linked with a mobile terminal, such as a worker's smartphone with a dedicated application installed, so that the measured result can be stored.

[0061] At this time, the GPS information of the mobile terminal is linked to the result value, making it possible to store information of the measurement location.

[0062] It can be linked by connecting to maps, etc. provided by portal sites.

[0063] The dedicated application described above can automatically calculate strength and other structural performance characteristics based on measured rebound hardness using pre-entered formulas and a database.

[0064] Although the present invention has been described in relation to preferred embodiments as mentioned above, various modifications and variations are possible within the scope of the essence of the invention, and it can be used in various fields.

[0065] Accordingly, the claims of the present invention include modifications and variations that fall within the true scope of the invention. Explanation of the symbols

[0066] 10: Concrete surface 20: RBI Grid 100: Main body 110: Handle 130: Switch 150: Output section 170: Display section 200: Tabong 300: Automatic pressure injection device

Claims

Claim 1 A total of 20 striking rods (200) are installed on the front of the main body (100), and the rebound hardness can be measured at once by pressing a total of 20 striking rods (200) against the concrete surface (10), and a Schmidt hammer test can be performed without drawing a total of 20 striking point grids (20) by separate manual work, and the striking pressure of the striking rods (200) is controlled through an automatic pressure injection device (300) installed on the main body (100), wherein the other end of the striking rod (200) is pressed against the concrete surface (10), and the other end of the striking rod (200) is inserted and installed into the front of the main body (100) and connected to the automatic pressure injection device (300), and the automatic pressure injection device (300) is configured to include a pressure sensor (not shown), a control device (not shown), and a hydraulic injection device (not shown), and the hydraulic injection device injects fluid at a predetermined pressure so that the striking rod (200) The above main body (100) has the function of applying pressure to one side, and comprises: a handle (110) that a worker can hold with both hands; a switch (130) that operates the automatic pressure injection device (300); an output unit (150) that prints the result; and a display unit (170) that displays the result value, such as the measured rebound hardness.An improved Schmidt hammer with improved constructability, comprising: a main body (100) having a transmission / reception module installed inside, which enables the storage of measured results by linking with a worker's mobile terminal with a dedicated application installed; GPS information of the mobile terminal linked to the results to enable the storage of measurement location information; and which can be linked to a map provided by a portal site; wherein the dedicated application is characterized by automatically calculating structural performance including strength based on the measured rebound hardness using a pre-entered formula and database; wherein a total of 20 striking rods (200) arranged in 5 rows and 5 columns operate simultaneously in close contact with the concrete surface (10), thereby automatically maintaining vertical alignment between the striking rods (200) and the concrete surface (10), thereby maintaining high measurement precision; and wherein the striking pressure is controlled through the automatic pressure injection device (300). Claim 2 delete Claim 3 delete

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