Folding type positioning point display device for measurement of resistance hardness for non-destructive testing of concrete structures

Abstract

The present invention comprises a left horizontal work plate (11) formed as a rectangular plate body having a rectangular through hole (11a) in the center, a triangular fixing piece (11b) in the shape of a right triangle fixed to the inner surface of each corner of the rectangular through hole (11a), and a Velcro tape (11ba) fixed to the bottom surface; a left end vertical wing plate (12) formed by being vertically bent upward for a certain length from the left end of the left horizontal work plate (11); and front and rear vertical wing plates (13, 14) each having a circular hinge plate (13b, 14b) formed by being vertically bent upward for the length of the left end vertical wing plate (12) from the front and rear ends of the left horizontal work plate (11), each having a shaft insertion hole (13a, 14a) at the left end and a circular hinge plate protruding outwardly upward in a circular shape at the right end and having a pin insertion hole (13ba, 14ba) formed in the center of the circle. A left work plate frame (10) having a wire-type foldable left handle (15) formed by each having a front and rear end hook portion (15a, 15b) that is formed by being vertically bent at both ends and inserted into the shaft insertion hole (13a, 14a) on the inside of the front and rear vertical wing plate (13, 14) and protruding outwardly, and a front and rear horizontal extension portion (15c, 15d) that is positioned on the inside of the front and rear vertical wing plate (13, 14) and extends horizontally to the right up to the circular hinge plate (13b, 14b), and a handle portion (15e) that is bent and extended in a curved manner toward the front and rear side from the right end of the front and rear horizontal extension portion (15c, 15d) and has a handle cap (15f) wrapped around the center for a certain length; A right horizontal work plate (21) is formed as a work plate frame located to the right of the above left work plate frame (10) and folded symmetrically with respect to the pin insertion holes (13ba, 14ba) of the circular hinge plates (13b, 14b), and is a rectangular horizontal plate body having a rectangular through hole (21a) in the center, and a right-angled triangular fixing piece (21b) is fixed to the inner surface of each corner of the rectangular through hole (21a), and a Velcro tape (21ba) is fixed to the bottom surface, and a right end vertical wing plate (22) is formed that is vertically folded upward for a certain length from the right end of the right horizontal work plate (21).A front and rear vertical wing plate (23, 34) is formed by being vertically bent upward from the front and rear end of the right horizontal work plate (21) by the length of the right end vertical wing plate (22), with a shaft insertion hole (23a, 24a) at the right end and an arc-shaped recess (23b, 24b) formed at the left end corresponding to the lower right side of the circular hinge plate (13b, 14b), and a fastening hole (23c, 24c) at the left end. A front and rear end hook portion (25a, 25b) is formed by being vertically bent at both ends and inserted into the shaft insertion hole (23a, 24a) at the inside of the front and rear vertical wing plate (23, 24) and protruding outward for hooking, and the front and rear end hook portion (25a, 25b) is positioned at the inside of the front and rear vertical wing plate (23, 24). A wire-type foldable right handle (25) is formed, having a front and rear horizontal extension section (25c, 25d) that extends horizontally to the left up to the yoke portion (23b, 24b), and a handle section (25e) that is bent in a curved manner toward the front and rear from the left end of the front and rear horizontal extension section (25c, 25d) and has a handle cap (25f) wrapped around the center for a certain length; and a circular hinge plate section (26a, 27a) is formed, each having a pin hole (26aa, 27aa) corresponding to the circular hinge plate (13b, 14b) which is located inside the circular hinge plate (13b, 14b) and has a pin insertion hole (13ba, 14ba), and is rotatably pin-inserted into the pin insertion hole (13ba, 14ba) through the pin hole (26aa, 27aa). A right work plate frame (20) having a pivot pin (26b, 27b) each, and a front and rear axis support plate (26c, 27c) formed therein, having a fixing hole (26ca, 27ca) formed in the lower right side of the circular hinge plate portion (26a, 27a) corresponding to the front and rear vertical wing plate (25, 24) and extending to the right side through the fastening hole (23c, 24c), and having a fixing plate (26c, 27c) formed therein that is fastened and fixed by a fixing bolt (26d, 27d) corresponding to the fastening hole (23c, 24c); and a rectangular through hole (11a, of the left and right work plate frames (10, 20).The present invention relates to a foldable measurement point display device for measuring rebound hardness for non-destructive testing of a concrete structure, comprising a measurement point display panel (30, 30a) having a plurality of circular or cross-shaped measurement point markings (31) formed at regular intervals on a silicone plate body inserted in correspondence with 21a), and a right-angled triangular felt sheet (32) formed on each of the four corners, which is fixed to the upper surface of the corners and attached to the Velcro tape (11ba, 21ba) of the triangular fixing piece (11b, 21b). The present invention allows for easy marking of multiple measurement points by simply spraying lacquer or ink through the plurality of measurement point markings on the measurement point display panel, regardless of whether the surface of the measurement point target is formed as an irregular uneven surface. Furthermore, during storage or transport, the foldable left and right handles can be folded inward for storage, and the left and right work plate frames can be rotated around a pivot pin to easily fold for storage and transport. In addition, since the measurement point display panel, which features multiple measurement point markings, is attached to the Velcro tape of the triangular fixing piece or stored inside the left and right work panel frames during storage or transport, there is absolutely no risk of damage or loss of the panel. Furthermore, as the silicone material of the measurement point display panel is not easily damaged by external impact during storage or transport, it has the effect of reducing maintenance costs.

Description

Technology Field

[0001] The present invention relates to a foldable measurement point indicator for measuring rebound hardness for non-destructive testing of concrete structures, and more specifically, to a foldable measurement point indicator for measuring rebound hardness for non-destructive testing of concrete structures, wherein even if the surface of the measurement point target is formed as an irregular uneven surface, multiple measurement points can be easily indicated by simply spraying lacquer or ink through multiple measurement point indicators on the measurement point indicator panel, and during storage or transport, the foldable left and right side handles can be folded and stored inward, and the left and right side work plate frames can be rotated around a pivot pin to easily fold and store and transport. Furthermore, since the measurement point indicator panel having multiple measurement point indicators is attached and fixed to the Velcro tape of the triangular fixing piece or stored inside the left and right side work plate frames during storage or transport, there is absolutely no concern about damage or loss of the measurement point indicator panel, and the measurement point indicator panel, which is made of silicone material, is not easily damaged by external impact during storage or transport, thereby reducing maintenance costs. Background Technology

[0002] In general, the rebound hardness test is a non-destructive method for estimating the compressive strength of concrete, based on the experimental experience that there is a specific correlation between the measured rebound value (R) and the compressive strength (Fc) of concrete when striking the surface of hardened concrete. Although numerous reliable non-destructive strength estimation formulas have been proposed, non-destructive strength is not consistently obtained due to the variety of formulas; therefore, it is necessary to first determine the compressive strength of a core sample and establish the correlation between this measured value and the rebound value.

[0003] As a method for estimating the non-destructive strength of concrete from the surface hardness, consideration of the test method, applicable strength range, determination formula, and evaluation method is necessary in the process of determining non-destructive strength.

[0004] The rebound hardness method, a type of non-destructive testing for concrete, measures the rebound hardness of the concrete surface by striking it with a Schmidt hammer. This method is based on experimental experience indicating a specific correlation between rebound hardness and concrete compressive strength when a hardened concrete surface is struck.

[0005] The rebound hardness test using the Schmidt hammer, a type of non-destructive testing, is very simple, internationally standardized, and widely used. Among various non-destructive testing methods for concrete compressive strength, it is known as the most effective, convenient, and widely applicable method for strength investigations in laboratories and reinforced concrete construction sites. The Schmidt hammer is a spring-loaded hammer; instead of measuring the diameter of the indentation on the concrete surface, the spring's rebound force can be directly determined from the hammer's scale, making it useful for simply measuring the internal strength of concrete structures.

[0006] Here, the conventional method of measuring the rebound hardness of concrete using a Schmidt hammer is as follows. First, 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 then five vertical lines are drawn along the vertical direction at intervals of 3 cm so as to be perpendicular to the horizontal lines. Then, the strength inside the concrete structure is measured by placing a Schmidt hammer at the perpendicular points (20 points) of each horizontal and vertical line.

[0007] However, drawing 5×4 orthogonal lines at 3 cm intervals every time the strength of a concrete structure is measured is very cumbersome in terms of work and causes the measurement time to be too long. In other words, for each concrete structure whose strength is to be measured, 5×4 orthogonal lines at 3 cm intervals must be drawn at regular intervals, a Schmidt hammer must be placed at the intersection point to measure the strength of the concrete, and the process of drawing 5×4 orthogonal lines at 3 cm intervals must be repeated, which reduces the efficiency of the measurement work and causes the measurement time to be too long.

[0008] To solve these problems, a "measurement point display device for forming a measurement point of a Schmidt hammer, comprising: a main body having a cylindrical shape, indented with a grid-like solid line on its outer surface to divide it into multiple facing and facing sections, and multiple measurement points formed at the points where the facing sections intersect; a support member fitted to both ends of the main body to allow the main body to rotate; and a handle formed on one side of the support member; wherein the measurement points are formed to be more concavely indented than the facing and facing sections, the width of the facing section is half the width of the facing section, the width of the facing section is 20 mm, and the width of the facing section is 10 mm, the measurement points are rectangular with dimensions of 10 × 10 mm, the circumference of the circle of the main body is 120 mm, and the arc length of the facing or facing section between the measurement points is 20 mm." has been registered as a patent. It was initiated under Notice No. 10-1410338 (announced on June 24, 2014).

[0009] This conventional measurement point display device displays the measurement point by rolling a cylindrical rotating support (200). While it can be used on curved surfaces such as circular columns or circular cross-sections, it has the problem that it cannot be used when the surface has irregular uneven surfaces.

[0010] In addition, there was a problem with a structural limitation in that, while it is acceptable when the distance between a marked point and another adjacent point is close using a conventional point marking device, if the distance exceeds 1500mm, the point cannot be marked on the point marking target.

[0011] In order to solve these problems, a stamp-type measurement point indicator mat for measuring rebound hardness for non-destructive testing of concrete structures is provided, comprising: a measurement point indicator mat body (10) made of silicone rubber material and having left and right handles (14, 15) formed protruding from the left and right ends, respectively, a support bolt body (20) fixedly installed at regular intervals on the measurement point indicator mat body (10), and a stamp-type measurement point indicator sponge (30) coupled to the support bolt body (20) and having a measurement point indicator part (32) on the outer surface that marks a measurement point (41) on the surface of a measurement point indicator target (40) with applied ink. In the stamp-type measurement point indicator mat, the measurement point indicator mat body (10) has an elliptical cross-section and a hollow part (13) inside, and a fastening part (12) of a certain thickness extending inward from the center of the bottom surface. A plurality of square tension mats (11), having a flat surface forming a square shape, are continuously connected in the longitudinal and transverse directions for a certain length; the left and right handles (14, 15) are each formed with a plate body having a triangular front surface, and are positioned at regular intervals on the front and rear sides of the left and right ends of the measurement point marking mat main body (10), with one end of each front and rear triangular support member (14a, 14b) (15a, 15b) formed respectively, and an upper handle bar (14c, 15c) and a lower handle bar (14d, 15d) are each formed to horizontally connect and fix the upper side and the outermost side of the left front and rear triangular support member (14a, 14b) and the right front and rear triangular support member (15a, 15b), respectively, and are used as handles; the support bolt body (20) is in the shape of a bolt, and one side is of the measurement point marking mat main body (10). It has a fastening part (22) that is fastened and fixed to the fastening part (12), and on the other side, a locking projection (21) that protrudes outward from the fastening part (22) and whose tip protrudes horizontally;The "stamp-type measurement point indicator mat for measuring rebound hardness for non-destructive testing of a concrete structure, characterized in that the stamp-type measurement point indicator sponge (30) is made of an ink-applying sponge material and has a recess formed internally on one side, into which a locking projection (21) of the support bolt body (20) is inserted and locked in place," was disclosed in Patent Registration No. 10-2120194 (published on June 8, 2020).

[0012] However, while the stamp-type measurement point indicator mat for non-destructive testing of concrete structures allows for easy marking of multiple measurement points by simply pressing lightly, regardless of whether the surface of the measurement target is formed as an irregular uneven surface, there were structural problems such as difficulty in storage or movement, a high risk of loss of the support bolt body (20) or stamp-type measurement point indicator sponge (30) during storage or movement, and high maintenance costs due to the measurement indicator mat body (10) being easily damaged by external impact during storage or movement. Prior art literature

[0013] (KR) Republic of Korea Patent No. 10-1410338 (Published June 24, 2014) (KR) Republic of Korea Patent No. 10-2120194 (Published June 8, 2020) The problem to be solved

[0014] The present invention aims to solve the aforementioned problems by providing a left work plate frame having a rectangular through hole, a triangular fixing piece, a left horizontal work plate, a left end vertical wing plate, front and rear vertical wing plates, and a foldable left handle; a right work plate frame having a rectangular through hole, a triangular fixing piece, a right horizontal work plate, a right end vertical wing plate, front and rear vertical wing plates, a foldable right handle, a pivot pin, and front and rear pivot support plates; and a measurement point display panel having a measurement point marking structure and a triangular felt sheet. This allows multiple measurement points to be easily marked simply by spraying lacquer or ink through multiple measurement point marking structures on the measurement point display panel, regardless of whether the surface of the measurement point target is formed as an irregular, uneven surface. Furthermore, during storage or transport, the foldable left and right handles are folded inward for storage, and the left and right work plate frames are rotated around the pivot pin as an axis to easily fold and store or transport. During storage or transport, multiple The purpose is to provide a foldable measurement point indicator for rebound hardness measurement for non-destructive testing of concrete structures, wherein the measurement point indicator panel, which has a measurement point indicator construction, is attached to the Velcro tape of a triangular fixing piece or stored inside the left and right work panel frames, thereby eliminating any risk of damage or loss of the measurement point indicator panel, and the measurement point indicator panel, being made of silicone material, is not easily damaged by external impact during storage or transportation, thus reducing maintenance costs.

[0015] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0016] To achieve the above objective, the present invention comprises a left horizontal work plate (11) formed as a rectangular plate body having a rectangular through hole (11a) in the center, a triangular fixing piece (11b) in the shape of a right triangle fixed to the inner surface of each corner of the rectangular through hole (11a), and a Velcro tape (11ba) fixed to the bottom surface; a left end vertical wing plate (12) formed by being vertically folded upward for a certain length from the left end of the left horizontal work plate (11); and a circular hinge plate (13b, 14b) formed by being vertically folded upward for the length of the left end vertical wing plate (12) from the front and rear ends of the left horizontal work plate (11), each having a shaft insertion hole (13a, 14a) at the left end and a pin insertion hole (13ba, 14ba) formed at the right end, protruding outward in a circular shape and having a pin insertion hole at the center of the circle. A wire-type foldable left handle (15) is formed, wherein front and rear vertical wing plates (13, 14) are each formed, and front and rear leading hook portions (15a, 15b) are each vertically bent at both ends and inserted into shaft insertion holes (13a, 14a) inside the front and rear vertical wing plates (13, 14) and protrude for catching, and front and rear horizontal extension portions (15c, 15d) are each positioned inside the front and rear vertical wing plates (13, 14) and extend horizontally to the right up to the circular hinge plate (13b, 14b), and a handle portion (15e) is formed in which a handle cap (15f) is wrapped around the center for a certain length and is bent and extended in a curved manner toward the front and rear from the right end of the front and rear horizontal extension portions (15c, 15d). Left work plate frame (10);

[0017] A work plate frame is formed that is positioned to the right of the above-mentioned left work plate frame (10) and folds symmetrically with respect to the pin insertion holes (13ba, 14ba) of the circular hinge plates (13b, 14b). The right horizontal work plate (21) is formed as a plate body that forms a rectangular horizontal shape, has a rectangular through hole (21a) in the center, and a triangular fixing piece (21b), which is a plate body in the shape of a right triangle, is fixed to the inner side of each corner of the rectangular through hole (21a), and a Velcro tape (21ba) is fixed to the bottom surface. A right end vertical wing plate (22) is formed that is vertically folded upward for a certain length from the right end of the right horizontal work plate (21). The right end vertical wing plate (22) is vertically folded upward for the length of the right end vertical wing plate (22) from the front and rear ends of the right horizontal work plate (21), and has an axle insertion hole (23a) at the right end.Each has a front and rear vertical wing plate (23, 34) formed with a fastening hole (23c, 24c) at the left end, each having a curved portion (23b, 24b) formed corresponding to the lower right side of the circular hinge plate (13b, 14b), and each having a front and rear vertical wing plate (23, 34) at the left end, and each has a front and rear end hook portion (25a, 25b) that is vertically bent at both ends and inserted into the shaft insertion hole (23a, 24a) inside the front and rear vertical wing plate (23, 24) and protrudes to be caught, and each has a front and rear horizontal extension portion (25c, 25d) that is located inside the front and rear vertical wing plate (23, 24) and extends horizontally to the left up to the curved portion (23b, 24b) from the front and rear end hook portion (25a, 25b). A wire-type foldable right handle (25) is formed, having a handle portion (25e) that is bent in a curved manner from the left end of the front and rear horizontal extension portions (25c, 25d) and extended toward the front and rear, with a handle cap (25f) wrapped around the center for a certain length; and a circular hinge plate portion (26a, 27a) is each formed with a pin hole (26aa, 27aa) corresponding to the circular hinge plate (13b, 14b) which is located inside the circular hinge plate (13b, 14b) and has a pin insertion hole (13ba, 14ba), and a pivot shaft pin (26b, 27b) is each inserted rotatably into the pin insertion hole (13ba, 14ba) through the pin hole (26aa, 27aa) and is formed at the lower right side of the circular hinge plate portion (26a, 27a). A right work plate frame (20) having a front and rear axis support plate (26, 27) each formed with a fixing plate (26c, 27c) that extends to the right side through a fastening hole (23c, 24c) corresponding to the front and rear vertical wing plate (25, 24), and has a fixing hole (26ca, 27ca) formed corresponding to the fastening hole (23c, 24c) and is fastened and fixed by a fixing bolt (26d, 27d); and.

[0018] The invention is characterized by having a measurement point display panel (30, 30a) in which a plurality of circular or cross-shaped measurement point display holes (31) are formed at regular intervals on a silicone plate body inserted corresponding to the rectangular holes (11a, 21a) of the left and right work plate frames (10, 20), and a right-angled triangular felt sheet (32) is formed on each side corner and fixed to the upper surface of the corners and attached to the Velcro tape (11ba, 21ba) of the triangular fixing piece (11b, 21b). Effects of the invention

[0019] Thus, the present invention comprises a left work plate frame having a rectangular through hole, a triangular fixing piece, a left horizontal work plate, a left end vertical wing plate, front and rear vertical wing plates, and a foldable left handle; a right work plate frame having a rectangular through hole, a triangular fixing piece, a right horizontal work plate, a right end vertical wing plate, front and rear vertical wing plates, a foldable right handle, a pivot pin, and front and rear pivot support plates; and a measurement point display panel having a measurement point display and a triangular felt sheet. This allows multiple measurement points to be easily displayed simply by spraying lacquer or ink through the multiple measurement point display on the measurement point display panel, regardless of whether the surface of the measurement point display target is formed as an irregular uneven surface. Furthermore, during storage or transport, the foldable left and right handles can be folded inward for storage, and the left and right work plate frames can be rotated around the pivot pin as an axis for easy foldable storage and transport. Additionally, during storage or transport, the device has multiple measurement point display Since the measurement point indicator panel is attached to the Velcro tape of the triangular fixing piece or stored inside the left and right work panel frames, there is absolutely no risk of damage or loss of the panel. Furthermore, because the silicone material of the measurement point indicator panel is not easily damaged by external impacts during storage or transportation, it has the effect of reducing maintenance costs.

[0020] The present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary knowledge in the art to which the invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims, and such modifications will be within the scope of the claims. Brief explanation of the drawing

[0021] FIG. 1 is an exploded perspective view showing the fastening of a foldable measurement point indicator device for measuring rebound hardness for non-destructive testing of a concrete structure, which is an embodiment of the present invention. FIG. 2 is a perspective view of the usage state in which the foldable left and right handles are folded inward for storage and transport after use of the foldable point marking device for measuring rebound hardness for non-destructive testing of concrete structures, which is an embodiment of the present invention. FIG. 3 is a perspective view showing the state in which the left work plate frame is pivotally rotated upwards toward the right work plate frame to fold and store the foldable point marking device for measuring rebound hardness for non-destructive testing of concrete structures, which is an embodiment of the present invention, for storage and transport after use. FIG. 4 is a plan view of the usage state in which the foldable left and right handles are folded inward for storage and transport after use of the foldable point marking device for measuring rebound hardness for non-destructive testing of concrete structures, which is an embodiment of the present invention. FIG. 5 is a side cross-sectional view showing the state in which the left work plate frame is pivotally rotated upwards toward the right work plate frame to fold and store the foldable point marking device for measuring rebound hardness for non-destructive testing of concrete structures, which is an embodiment of the present invention, for storage and transport after use. FIG. 6 is a perspective view showing the state of use of a foldable point indicator device for measuring rebound hardness for non-destructive testing of a concrete structure, which is an embodiment of the present invention. Specific details for implementing the invention

[0022] The present invention will be described in more detail below with reference to the attached drawings.

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement them. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0024] In order to clearly explain the invention in the drawings, parts unrelated to the explanation have been omitted, and the same reference numerals have been used for identical or similar components throughout the specification. The scope of the invention should not be interpreted as being limited by the embodiments described in the text, and since the embodiments are subject to various modifications and may take various forms, the scope of the invention should be understood to include equivalents capable of realizing the technical concept.

[0025] Throughout the specification of the present invention, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members in between. Furthermore, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0026] The terms used in this invention are defined considering their functions within the invention; however, since these may vary depending on the intentions or practices of the user or operator, the definitions of these terms should be interpreted in a meaning and concept consistent with the technical details of this invention.

[0027] Furthermore, optional terms in the embodiments below are used to distinguish one component from another, and the components are not limited by said terms. In describing the present invention below, detailed descriptions of related prior art that may unnecessarily obscure the essence of the invention are omitted.

[0028] The foldable measurement point display device for measuring rebound hardness for non-destructive testing of concrete structures according to the present invention comprises a left work plate frame (10) to which a measurement point display panel (30) is attached to display a measurement point on the left side of the measurement point display target, a right work plate frame (20) to which a measurement point display panel (30a) is attached and folded by pivoting on the right side of the left work plate frame (10) to display a measurement point on the right side of the measurement point display target, and a measurement point display panel (30, 30a) attached to the left and right work plate frames (10, 20) to display multiple measurement points on the surface of the measurement point display target using lacquer or ink, etc.

[0029] The above-mentioned left work plate frame (10) is formed with a left horizontal work plate (11) which is a rectangular plate body forming a horizontal shape, has a rectangular through hole (11a) in the center, and a triangular fixing piece (11b), which is a plate body in the shape of a right triangle, is fixed to the inner surface of each corner of the rectangular through hole (11a), and a Velcro tape (11ba) is fixed to the bottom surface; a left end vertical wing plate (12) is formed which is vertically folded upward for a certain length from the left end of the left horizontal work plate (11); and a circular hinge plate (13b, 14b) is formed which is vertically folded upward for the length of the left end vertical wing plate (12) from the front and rear ends of the left horizontal work plate (11), has a shaft insertion hole (13a, 14a) at the left end, and protrudes outward in a circular shape at the right end, with a pin insertion hole (13ba, 14ba) formed in the center of the circle. A wire-type foldable left handle (15) is formed, each having front and rear vertical wing plates (13, 14) formed, and each having front and rear leading hook portions (15a, 15b) that are vertically bent at both ends and inserted into shaft insertion holes (13a, 14a) inside the front and rear vertical wing plates (13, 14) and protrude for hooking, each having front and rear horizontal extension portions (15c, 15d) that are positioned inside the front and rear vertical wing plates (13, 14) and extend horizontally to the right up to the circular hinge plate (13b, 14b), and each having a handle portion (15e) that is bent and extended in a curved manner toward the front and rear side from the right end of the front and rear horizontal extension portions (15c, 15d) and has a handle cap (15f) wrapped around the center for a certain length.

[0030] The above right work plate frame (20) is a work plate frame positioned to the right of the above left work plate frame (10) and folded symmetrically with respect to the pin insertion holes (13ba, 14ba) of the circular hinge plates (13b, 14b). It is a rectangular horizontal plate body with a rectangular through hole (21a) in the center, and a right horizontal work plate (21) is formed, in which a triangular fixing piece (21b), which is a plate body in the shape of a right triangle, is fixed to the inner side of each corner of the rectangular through hole (21a), and a Velcro tape (21ba) is fixed to the bottom surface. A right end vertical wing plate (22) is formed that is vertically folded upward for a certain length from the right end of the right horizontal work plate (21). It is vertically folded upward for the length of the right end vertical wing plate (22) from the front and rear ends of the right horizontal work plate (21), and has an axle insertion hole (23a) at the right end.Each has a front and rear vertical wing plate (23, 34) formed with a fastening hole (23c, 24c) at the left end, each having a curved portion (23b, 24b) formed corresponding to the lower right side of the circular hinge plate (13b, 14b), and each having a front and rear vertical wing plate (23, 34) at the left end, and each has a front and rear end hook portion (25a, 25b) that is vertically bent at both ends and inserted into the shaft insertion hole (23a, 24a) inside the front and rear vertical wing plate (23, 24) and protrudes to be caught, and each has a front and rear horizontal extension portion (25c, 25d) that is located inside the front and rear vertical wing plate (23, 24) and extends horizontally to the left up to the curved portion (23b, 24b) from the front and rear end hook portion (25a, 25b). A wire-type foldable right handle (25) is formed, having a handle portion (25e) that is bent in a curved manner from the left end of the front and rear horizontal extension portions (25c, 25d) and extended toward the front and rear, with a handle cap (25f) wrapped around the center for a certain length; and a circular hinge plate portion (26a, 27a) is each formed with a pin hole (26aa, 27aa) corresponding to the circular hinge plate (13b, 14b) which is located inside the circular hinge plate (13b, 14b) and has a pin insertion hole (13ba, 14ba), and a pivot shaft pin (26b, 27b) is each inserted rotatably into the pin insertion hole (13ba, 14ba) through the pin hole (26aa, 27aa) and is formed at the lower right side of the circular hinge plate portion (26a, 27a). A front and rear axis support plate (26, 27) is formed, each having a fixing plate (26c, 27c) that extends to the right side through a fastening hole (23c, 24c) corresponding to the front and rear vertical wing plate (25, 24), and has a fixing hole (26ca, 27ca) formed corresponding to the fastening hole (23c, 24c) and is fastened and fixed by a fixing bolt (26d, 27d).

[0031] The above measurement point indicator panels (30, 30a) are each made of a silicone plate body that is inserted into the rectangular holes (11a, 21a) of the left and right work board frames (10, 20) respectively, and have multiple circular or cross-shaped measurement point indicator holes (31) formed at regular intervals, and right-angled triangular felt sheets (32) that are fixed to the upper surface of the four corners and attached to the Velcro tapes (11ba, 21ba) of the triangular fixing pieces (11b, 21b) are each formed.

[0032] The present invention allows for easy marking of multiple measurement points by simply spraying lacquer or ink through multiple measurement point markings (31) of the measurement point display panel (30, 30a), regardless of whether the surface of the measurement point display target is formed as an irregular uneven surface. During storage or transport, the foldable left and right side handles (15, 25) are folded and stored inside, and the left and right side work board frames (10, 20) are rotated around the pivot pins (26b, 27b) to easily fold and store or transport. During storage or transport, the measurement point display panel (30, 30a) having multiple measurement point markings (31) is attached and fixed to the Velcro tape (11ba, 21ba) of the triangular fixing piece (11b, 21b) or stored inside the left and right side work board frames (10, 20), thereby eliminating any concern regarding damage or loss of the measurement point display panel (30, 30a). The invention is made of silicone material. The measurement point display panel (30, 30a) is not easily damaged by external impact during storage or transport, so maintenance costs are greatly reduced.

[0033] The embodiments and drawings attached to this specification merely clearly illustrate a part of the technical concept included in the present invention, and it is obvious that variations and specific embodiments that can be easily deduced by a person skilled in the art within the scope of the technical concept included in the specification and drawings of the present invention are all included within the scope of the technical concept of the present invention.

[0034] The scope of the present invention is defined by the claims set forth below rather than by the detailed description, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0035] 10: Left work board frame 11: Left horizontal work board 11a : Rectangular through hole 11b : Triangular fixing piece 11ba : Velcro tape 12 : Left vertical wing plate 13,14: Front and rear vertical wing plates 13a,14a: Shaft insertion holes 13b, 14b: Circular hinge plate 13ba, 14ba: Pin insertion hole 15: Foldable left handle 15a, 15b: Front and rear tip hook parts 15c, 15d: Front and rear horizontal extension part 15e: Handle part 15f : Handle cap 20 : Right work board frame 21 : Right horizontal work board 21a: Rectangular through hole 21b: Triangular fixing piece 21ba : Velcro tape 22 : Right vertical wing plate 23, 24: Front and rear vertical wing plates 23a, 24a: Shaft insertion holes 23b, 24b: Hyohyeong yomeu 23c, 24c: Jeonggong hole 25: Foldable right handle 25a, 25b: Front and rear tip hooks 25c, 25d: Front and rear horizontal extension part 25e: Handle part 25f : Handle cap 26,27 : Front and rear shaft support plates 26a, 27a: Circular hinge plate part 26aa, 27aa: Pin hole 26b, 27b: Rotating shaft pins 26c, 27c: Fixing plates 26ca, 27ca : Fixing holes 26d, 27d : Fixing bolts 30,30a : Survey point marking panel 31 : Survey point marking construction 32 : Triangular felt paper

Claims

Claim 1 A left work plate frame (10) having a left horizontal work plate (11) which is a rectangular horizontal plate chain, a left end vertical wing plate (12) which is vertically folded upward by a certain length from the left end of the left horizontal work plate (11), front and rear vertical wing plates (13, 14) which are each vertically folded upward by the length of the left end vertical wing plate (12) from the front and rear ends of the left horizontal work plate (11), and a wire-type foldable left handle (15) formed with a handle part (15e) in the center where a handle cap (15f) is wrapped for a certain length, and a work plate frame located to the right of the left work plate frame (10) that is symmetrically foldable, having a right horizontal work plate (21) which is a rectangular horizontal plate chain, a right end vertical wing plate (22) which is vertically folded upward by a certain length from the right end of the right horizontal work plate (21), and a right horizontal work plate (21). In a foldable measurement point indicator device for non-destructive testing of a concrete structure, the right work plate frame (20) has a wire-type foldable right handle (25) formed by having front and rear vertical wing plates (23, 34) that are vertically folded upward by the length of the right vertical wing plate (22) at the front and rear ends, and a handle part (25e) formed in the center where a handle cap (25f) is wound for a certain length, and a measurement point indicator construction (31) is formed through holes in the left work plate frame (10) and the right work plate frame (20), wherein the left horizontal work plate (11) of the left work plate frame (10) is a plate body having a rectangular through hole (11a) in the center, a triangular fixing piece (11b) in the shape of a right triangle is fixed to the inner side of each corner of the rectangular through hole (11a), and a Velcro tape (11ba) is fixed to the bottom surface; The front and rear vertical wing plates (13, 14) each have a shaft insertion hole (13a, 14a) at their left ends and a circular hinge plate (13b, 14b) at their right ends that protrudes outward in a circular shape and has a pin insertion hole (13ba, 14ba) formed in the center of the circle;The above-mentioned foldable left handle (15) has front and rear end hook portions (15a, 15b) that are vertically folded at both ends and inserted into shaft insertion holes (13a, 14a) on the inside of the front and rear vertical wing plates (13, 14) and protrude for catching, and has front and rear horizontal extension portions (15c, 15d) that are positioned on the inside of the front and rear vertical wing plates (13, 14) and extend horizontally to the right up to the circular hinge plate (13b, 14b), and are bent in a curved manner toward the front and rear side from the right end of the front and rear horizontal extension portions (15c, 15d) and extend; The right horizontal work plate (21) of the right work plate frame (20), which is a work plate frame positioned to the right of the above left work plate frame (10) and folded symmetrically with respect to the pin insertion holes (13ba, 14ba) of the circular hinge plates (13b, 14b), is a rectangular horizontal plate body having a rectangular through hole (21a) in the center, and a triangular fixing piece (21b), which is a plate body in the shape of a right triangle, is fixed to the inner surface of each corner of the rectangular through hole (21a), and a Velcro tape (21ba) is fixed to the bottom surface; The above front and rear vertical wing plates (23, 34) each have a shaft insertion hole (23a, 24a) at their right ends and a curved portion (23b, 24b) formed at their left ends corresponding to the lower right side of the circular hinge plates (13b, 14b), and each have a fastening hole (23c, 24c) at their left ends; the above foldable right handle (25) has a front and rear end hook portion (25a, 25b) that is vertically folded at both ends and inserted into the shaft insertion hole (23a, 24a) inside the front and rear vertical wing plates (23, 24) and protrudes outwardly, and is positioned inside the front and rear vertical wing plates (23, 24) and extends horizontally to the left from the front and rear end hook portion (25a, 25b) to the curved portion (23b, 24b). Each has a front and rear horizontal extension section (25c, 25d), and the front and rear horizontal extension sections (25c, 25d) are bent in a curved manner toward the front and rear sides and extended;Each circular hinge plate part (26a, 27a) is formed with a pin hole (26aa, 27aa) corresponding to the circular hinge plate (13b, 14b) which is located on the inner side of the circular hinge plate (13b, 14b) and has a pin insertion hole (13ba, 14ba), and each has a pivot shaft pin (26b, 27b) which is rotatably inserted into the pin insertion hole (13ba, 14ba) through the pin hole (26aa, 27aa), and each has a fixing hole (26ca, 27ca) formed at the lower right side of the circular hinge plate part (26a, 27a) which is formed to correspond to the front and rear vertical wing plate (25, 24) and extends to the right side through the fastening hole (23c, 24c), and is fastened and fixed by a fixing bolt (26d, 27d) corresponding to the fastening hole (23c, 24c). A foldable measurement point indicator for non-destructive testing of a concrete structure, characterized in that front and rear axis support plates (26, 27) each having a fixing plate (26c, 27c) are formed; the measurement point indicator (31) is formed in a plurality of circular or cross shapes at regular intervals on a measurement point indicator panel (30, 30a), which is a silicone plate inserted into the rectangular holes (11a, 21a) of the left and right working plate frames (10, 20), and the measurement point indicator panel (30, 30a) is fixed to the upper surface of the four corners of the rectangular holes (11a, 21a) of the left and right working plate frames (10, 20) and a triangular felt sheet (32) in the shape of a right triangle is formed to be attached and fixed to the Velcro tape (11ba, 21ba) of the triangular fixing piece (11b, 21b).

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