KR102142873B1 - Schmidt hammer strike point indicator for safety inspection of concrete structure - Google Patents

Abstract

The present invention relates to a Schmidt hammer striking point indicator for structure safety diagnosis, which rotates a pen in a non-powdered scheme with a simple structure to clearly display a striking point for easy use at low costs. According to the present invention, the Schmidt hammer striking point indicator for structure safety diagnosis comprises: a support plate (10) supported on a surface of a structure (1), and having a rotary guide (20) erected in a circular shape at the circumference; and a rotary marking manipulation means to which a plurality of pen holders (51) accommodated with each pen (52) are fixed, and allowing the pen to mark a striking point while rotating a circle at the trajectory in the rotary guide in a state of fixing the support plate. The rotary marking manipulation means includes: a rotary plate (30) which is the outer diameter forming a gap from the rotary guide of the support plate at the circumference, and rotatably supported on the support plate; a rotary manipulation plate (40) which is the outer diameter forming a gap from the rotary guide of the support plate at the circumference, and connected to be elevated through an elastic member on the rotary plate so as to be rotated together with the rotary plate; and a pen holder plate (50) formed between the rotary manipulation plate and the rotary plate, and having the pen holders in which the pen is separately accommodated. The pen marks a striking point while drawing a circle by the rotation of the rotary plate and the rotary manipulation plate.

Description

Schmidt hammer strike point indicator for safety inspection of concrete structure

The present invention relates to a Schmidt hammer striking point indicator for safety inspection and diagnosis, and more particularly, to a Schmitt hammer striking point indicator for structural safety diagnosis in which a pen draws a circle without using power and marks the striking point. will be.

This part provides background information related to the contents of the present application, but is not necessarily prior art.

In general, as the number of aging infrastructures increases, non-destructive testing of structures is emerging as an important task in order to secure the safety of existing structures along with safe maintenance of these infrastructures. In addition, cases of remodeling structures in consideration of economic feasibility, usability, and efficiency are increasing, and even in this case, non-destructive testing is becoming very important in relation to safety evaluation for structures and recyclability evaluation for demolition facilities. In particular, in the case of existing infrastructure, steel and concrete are used as main materials, and concrete takes up a greater proportion of these two representative construction materials, so non-destructive testing of concrete is important.

There is the Schmidt Hammer Test, which is widely used as a non-destructive test method for existing concrete facilities.

The Schmidt hammer method draws 4 parallel horizontal lines with chalk and a ruler with an interval of 3cm each along the horizontal direction on the concrete surface to be measured, and then spaces each 3cm along the vertical direction so as to be perpendicular to the horizontal line. Five vertical lines are drawn, and a Schmidt hammer is applied to the orthogonal points (20 points) of each horizontal line and vertical line to measure the hardness inside the concrete structure.

However, whenever measuring the hardness of a concrete structure, drawing 5 (length) ㅧ4 (lateral) orthogonal straight lines at 3 cm intervals is very cumbersome in the work, depends on the operator's manual work, and takes a long time to measure. It has a drawback.

As a patent document for solving the above-described problems, Patent No. 10-1972764 is a frame-shaped frame in which diaphragms spaced apart from each other are installed inside; A perforated plate installed between the diaphragms and at the center of the inside of the frame, and having a plurality of through holes arranged in a grid shape; A sleeve inserted through the through hole and bonded to the perforated plate; Oilless bearing installed on the inner peripheral surface of the sleeve; A hollow shaft that is inserted and supported by an oilless bearing and has a flange formed on the outer circumferential surface of the sleeve; A stopping ring installed on the lower outer circumferential surface of the hollow shaft and caught on the lower end of the sleeve; A choke holder for chucking a choke for marking a hit point on the hardness measurement surface of the concrete structure, and being installed at the center of the hollow shaft to rotate with the hollow shaft; A rocking arm installed on the outer peripheral surface of the hollow shaft and having a guide hole; A pivot shaft installed in the longitudinal direction inside the frame; A pivoting arm rotating around a pivot axis; A handle installed on the rotating arm; A forward stopper and a reverse stopper installed on the frame to limit the rotation angle of the rotating arm in the forward and reverse direction; A crossbar installed on the pivot arm; A connecting rod installed on the crossbar and rotated around the crossbar; Rod guide holes formed in the transverse direction in the partition plate; A tension rod inserted into the rod guide hole and having one end connected to the connecting rod; Slide pins installed at regular intervals along the longitudinal direction of the tension rods and transferring power to the swinging arm while being caught in the guide hole formed in the swinging arm positioned in a row; It is connected to the other end of the tension rod and includes a return mechanism that applies a tension force to the tension rod in a direction opposite to the force applied to the tension rod by the connecting rod.

Registration Patent No. 10-2083527 is a frame in which a handle is installed; A pair of parallel guide shafts having both ends supported by the frame across the inside of the frame; A carrier moving in a linear direction along the guide shaft; A rotating shaft formed at a right angle to the guide shaft and supported at both ends of the frame; A first driven pulley and a second driven pulley installed at both ends of the rotating shaft; A transfer motor installed on the frame; A transfer pulley installed on the motor shaft of the transfer motor; A transfer belt wound around the transfer pulley and the first driven pulley to transfer the carrier; An idle pulley installed on the frame; A synchronous belt that is wound around the idle pulley and the second driven pulley to transfer the carrier together with the transfer belt; A first belt fastener and a second belt fastener respectively installed at both ends of the carrier to couple the transfer belt and the synchronization belt to the carrier; A plurality of bearing housings vertically installed on the carrier while being spaced apart from each other; Sleeve bearings each press-fit into the bearing housing; Hollow shafts that are respectively inserted into the sleeve bearings and rotated; Eccentric holes each formed in the hollow shaft so as to be eccentric at the center of rotation of the hollow shaft; Marking pens each inserted into the eccentric hole and rotated together with the hollow shaft to mark the hitting point circularly on the hardness measurement surface; Caps for opening and closing the upper end of the hollow shaft, respectively; Annular spring locking projections each formed on the lower outer peripheral surface of the hollow shaft; A descending spring that repels between the lower end of the bearing housing and the spring locking jaw and is respectively installed on the outer circumferential surface of the hollow shaft; Spur gears that are respectively installed on the upper outer circumferential surface of the hollow shaft and are meshed with each other to transmit power; A reduction motor installed in the carrier; A drive pulley installed on the motor shaft of the reduction motor; A transmission shaft installed perpendicular to the carrier; Electric pulley installed at the bottom of the transmission shaft; An electric belt that is wound around the drive pulley and the electric pulley to transmit power from the reduction motor to the electric shaft; An electric gear installed on the upper end of the transmission shaft and transmitting power to a spur gear; A first servo motor and a second servo motor installed on the upper part of the carrier at intervals from each other; A pair of servo arms installed on the first servo motor and the second servo motor, respectively; Both ends are pivotally coupled to the servo arm, and it is composed of a lifting bar that raises the spur gear and the hollow shaft by being caught at the bottom of the teeth of the spur gears. Also, it is difficult to use and requires a lot of cost.

In addition, the patent document has a problem in that the trajectory of a circle drawn by a pen cannot be changed.

Registered Patent No. 10-1972764 Registered Patent No. 10-2083527

An object of the present invention is to solve the above-described problems, and to provide a Schmidthammer striking point indicator for structural safety diagnosis that clearly displays the striking point by turning a pen in a simple structure and non-powered and non-powered manner.

Further, another object of the present invention is to make the trajectory of a circle drawn with a pen different.

Schmidt hammer hitting point indicator for the safety diagnosis of the structure according to the present invention, the support plate is supported on the surface of the structure and the rotation guide is erected in the shape of a circle at the circumference; A plurality of pen holders each containing pens are fixed, and a rotary marking operation means for allowing the pen to mark a striking point while rotating a circle in the rotation guide by holding the support plate in a fixed state, the rotary marking operation means , An outer diameter forming a gap with the rotation guide of the support plate at the periphery and a rotating plate rotatably supported on the support plate, an outer diameter forming a gap with the rotation guide of the support plate at the circumference, and being able to move up and down through an elastic member on the rotation plate A rotating operation plate connected to each other to rotate with the rotating plate, a pen holder plate formed between the rotating operation plate and the rotating plate and having a plurality of pen holders each receiving the pen, wherein the pen rotates with the rotating plate It is characterized in that the hitting point is marked while drawing a circle by the rotation of the operation panel.

According to the Schmidt hammer striking point indicator for the safety diagnosis of the structure according to the present invention, by turning the pen to mark the striking point, it is possible to mark a clear and thick striking point even with a thin pen, so the hardness measurement work of the structure is very It is easy, and the use of a non-powered and non-powered method has the effect of low manufacturing cost and maintenance cost and long-term use without failure.

1 is a front view of the Schmidt hammer hitting point indicator for the safety diagnosis of the structure according to the present invention.
Figure 2 is an exploded perspective view of the Schmidt hammer hitting point indicator for the safety diagnosis of the structure according to the present invention.
Figure 3 is a plan view of the Schmidt hammer hitting point indicator for the safety diagnosis of the structure according to the present invention.
Figure 4 is a front view showing another example of a rotation guide applied to the Schmidt hammer hitting point indicator for the safety diagnosis of the structure according to the present invention.
5 and 6 are a front view showing an example of a close contact guide applied to the Schmidt hammer striking point indicator for the safety diagnosis of a structure according to the present invention and an operating state.

In the following description of the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

1 to 3, the Schmidt hammer hitting point indicator 100 for the safety diagnosis of the structure according to the present invention is a support plate 10 supported on the surface of the structure 1, the support plate 10 A rotational marking operation means that is supported by a rotation guide 20 that is erected in a shape and a support plate 10 to enable rotation (meaning that it moves while drawing a circle), and that marks the hitting point while rotating under the guidance of the rotation guide 20 As a result, it is composed of a rotating plate 30, a rotating operation plate 40, and a pen holder plate 50.

The support plate 10 is in the form of a frame having a pen rotation hole 11 at the center portion so that the pen 52 received through the pen holder 51 in the pen holder plate 50 indicates the hitting point on the surface of the structure 1, Its appearance can be in various shapes such as round and square.

The support plate 10 includes a plurality of dampers 12 supported on the surface of the structure 1.

The damper 12 may be rubber, spring, bolt or the like. The rubber and spring stably support the support plate 10 through elastic deformation, and the bolt has the advantage of enabling leveling of the support plate 10.

The support plate 10 includes a handle. The handle is, for example, in the form of a rod extending laterally to the circumference of the support plate 10 and extending toward the opposite side of the structure 1.

The support plate 10 of this configuration supports itself by supporting the rotating plate 20 at the bottom.

The rotation guide 20 is a guide wall having a curved cross section that is erected at regular intervals along the circumferential direction of the support plate 10.

The rotation guide 20 may have a height covering the rotation plate 30 or a height covering the rotation operation plate 40, and a height covering the rotation operation plate 40 is illustrated and described as an example.

Such a rotation guide 20 uniformly guides the rotational trajectory of the rotation plate 30 and the rotation operation plate 40 so that a number of hitting points are marked in the same shape, and when the operator rotates the rotation operation plate 40 It is possible to mark the hitting point through a convenient operation of turning the rotation operation plate 40 in a state in contact with the rotation guide 20.

The rotation guide 20 is not limited to that shown in the drawings, and may be in the shape of a circle.

The support plate 10 and the rotation guide 20 can be both prefabricated and integrated, and in the case of the prefabricated type, they are useful in that they can be replaced and position adjustable.

The rotation guide 20 includes a fixture 21 to prevent the rotation plate 30 from being separated. The fixture 21 is preferably assembled by bolts and penetrates from the outside to the inside of the rotation guide 20 so that the end thereof overlaps the upper portion of the rotation plate 30 to prevent the separation of the rotation plate 30.

The rotary plate 30, the rotary operation plate 40, and the pen holder plate 50 are as assemblies and are rotated together by the operation of the rotary operation plate 40 and mark the hitting point by the pen 52.

The rotating plate 30 is rotatably mounted on the support plate 10 and is a circular plate having a hole formed in the center so that the pen 52 marks the striking point on the surface of the structure 1, and bearing at the bottom for smooth rotation. (31) may be included.

The rotating plate 30 includes a coil spring 33 as an elastic member fitted to the bolt 32 and two or more bolts 32 erected on the upper part of the drawing, and the bolt 32 is a rotating operation plate 40 After passing through the bolt through hole of the nut 34 is fastened to be fixed with the rotation control plate 40, and the coil spring 33 is inserted into the bolt 32 to elastically support the rotation control plate 40 at the bottom.

The rotating operation plate 40 is assembled on the upper part of the rotating plate 30 through the bolts 32 and nuts 34 of the rotating plate 30 and includes a handle 41.

Both the rotating plate 30 and the rotating operation plate 40 have an outer diameter smaller than the inner diameter of the rotating guide 20, and as shown in FIG. 3, a distance d between the rotating operation plate 40 and the rotating guide 20 Is formed. This interval (d) is a free space in which the rotating operation plate 40 rotates.

The rotating operation plate 40 includes two or more bolts 42 for assembling the pen holder plate 50 at the bottom and a coil spring 43 and a nut 44 as an elastic member.

The bolt 42 is formed at the bottom of the rotary operation plate 40 toward the bottom, penetrates the bolt through hole of the pen holder plate 50, and then assembles the pen holder plate 50 by fastening the nut 44.

The coil spring 43 is inserted into the circumference of the bolt 42 and elastically supports the pen holder plate 50 so that the pen 52 moves to the opposite side of the structure 1 when marking the striking point on the structure 1 It helps to prevent the pen 52 from scattering.

The coil spring 43 is shown to be present only in the upper portion of the pen holder plate 50, but is not limited thereto, and may be applied to the upper portion and the bottom portion of the pen holder plate 50, that is, the upper portion of the nut 44.

The rotation operation plate 40 is configured in a circular shape for rotation and rotates while drawing a circle by receiving the guidance of the rotation guide 20 while the circumferential portion touches the inner surface of the rotation guide 20.

In this case, a roller 45 may be applied to an edge of the rotating operation plate 40 to reduce friction of the rotating operation plate 40.

The roller 45 is installed so that a part of the roller 45 protrudes outward from the rotation operation plate 40 and reduces frictional resistance while rolling along the inner surface of the rotation guide 20.

The roller 45 can be applied to any of the upper and lower portions of the rotating operation plate 40.

The pen holder plate 50 is configured such that the pen 52 indicating the striking point is accommodated through the pen holder 51, for example, a plurality of pens (for example, 20 or 25) penetrating up and down the plate There is a hole, and the pen holder 51 in the form of a ring surrounding the pen 52 is fixed or detachably fixed in the hole.

The pen holder 51 is formed in each hole of the pen holder plate 50, the pen 52 is accommodated therein, and a tightening bolt may be configured so that the pen 52 is fixed without being separated.

The pen holder plate 51 of this configuration is assembled to the rotary operation plate 40 in such a way that the bolt 42 of the rotary operation plate 40 is inserted into the bolt through hole formed at the edge and the nut 44 is fastened at the bottom. do.

The pen holder plate 51 rotates together with the rotating operation plate 40 while allowing the pen 52 to move backward or forward to the opposite side of the structure 1 through the elastic force of the coil spring 53.

The pen 52 is an off-the-shelf product such as chalk and water-based pen, and therefore, has an advantage of preventing malfunction due to hardening of the ink, and easier handling, less contamination than when using conventional ink.

A method of marking and safety diagnosis using a Schmidt hammer hitting point indicator for the safety diagnosis of a structure according to the present invention is as follows.

1. Selecting the marking position.

Grind the surface of the structure (1) if necessary for safety inspection and diagnostic work by a Schmidt hammer.

2. Mounting the striking point indicator.

The support plate 10 applied to the hitting point indicator 100 is mounted on the surface of the structure 1. In this case, a handle of the support plate 10 may be used, and the damper 12 is supported on the surface of the structure 1 in the support plate 10.

3. Marking of hit points.

While holding the handle 41 of the rotating operation panel 40, pressing the rotating operation panel 40 toward the structure 1, raise it toward the upper rotating guide 20 as shown in FIG. 3, and then rotate it one round in the clockwise direction.

The rotating operation plate 30 draws a circle of a certain trajectory under the guidance of the rotating guide 20 arranged in the shape of a circle, and in this process, the rotating plate 30 rotates by rotating the support plate 10 as a support base. Guide the rotation of the operation panel 40. In addition, the rotating plate 30 is not separated through the fixture 21 and prevents the rotating operation plate 40 from moving away from the structure 1.

The pen holder plate 50 rotates in the same trajectory by the rotation of the rotary operation plate 40, and thus, the pen 52 marks the striking point on the surface of the structure 1.

As shown in the arc of FIG. 3, a striking point 2 having a larger diameter than the thickness of the pen 52 is indicated. Eventually, even if the pen 52 has a thin diameter, it is possible to mark the striking point 2 that can be checked at a glance.

The rotating operation panel 40 can be rotated one turn clockwise and then one turn counterclockwise to return to its original position, thereby displaying the striking point 2 darker.

When the striking point indicator 100 is removed from the structure 1, a plurality of striking points 2 by the pen 52 are displayed on the surface of the structure 1.

4. Structure hardness measurement.

The striking point of the structure 1 is hit with a Schmidt hammer to measure the hardness of the structure 1.

In the present invention, it is also possible to change the rotation trajectory of the rotation plate 30 and the rotation operation plate 40 by installing the rotation guide 20 so as to be movable along the circumference from the center of the support plate 10. .

For example, as shown in FIG. 4, the rotation guide 20 is fixed to the support plate 10 through one or more positioning bolts 22 on the support plate 10.

The position adjustment device 22 is screwed to the nut part 13 formed in the support plate 10 while passing through the bolt through hole formed in the rotation guide 20, and between the rotation guide 20 and the nut part 13 While supporting the rotation guide 20, a position adjustment damper 23 for adjusting the position of the rotation guide 20 is installed.

The position control damper 23 may be a coil spring, a rubber plate, etc. that are coupled to the circumference of the position control bolt 21.

The position adjustment method of the rotation guide 20 is, when the position adjustment bolt 22 is tightened, the rotation guide 20 advances to the nut part 13 and compresses the position adjustment damper 23 to become close to the rotation plate 30, On the contrary, when the position adjustment bolt 22 is loosened, the rotation guide 20 moves backward from the rotation plate 30 to increase the distance.

In addition, the present invention is configured as follows to naturally move toward the surface of the structure 1 when the operator rotates the rotating operation plate 40 without forcibly pressing it toward the structure 1.

5 and 6, the rotation guide 20 is a close contact guide 24 that presses the circumference of the rotation operation plate 30 downward on the inner surface so that the pen 52 is in close contact with the surface of the structure 1 Includes.

The contact guide 24 protrudes from the inner surface of the rotation guide 20 and has an inclined portion formed thereon, and the corresponding rotating operation plate 40 is inclined on a surface opposite to the inclined portion of the contact guide 24 A portion 46 is formed.

The inclined portion of the close contact guide 24 is inclined in a direction in which the rotating operation plate 40 is moved toward the structure 1.

1: structure,
10: support plate, 11: pen rotation hole
12: damper, 13: nut part
20: rotation guide, 21: fixture
22: position adjustment bolt, 23: position adjustment damper
24: close guide,
30: rotating plate, 31: bearing
32,42: bolt, 33,43: coil spring
34,44: nut,
40: rotating operation panel, 41: handle
45: roller, 46: slope
50: pen holder plate, 51: pen holder
52: pen,

Claims (4)

A support plate 10 supported on the surface of the structure 1 and on which a rotation guide 20 is erected in a circular shape at the circumference;
A plurality of pen holders 51 in which the pens 52 are respectively accommodated are fixed, and a rotary marking operation means for allowing the pen to mark a striking point while rotating a circle in a trajectory in the rotation guide by fixing the support plate,
The rotary marking operation means,
A rotating plate 30 rotatably supported on the support plate while having an outer diameter forming a gap with the rotation guide of the support plate at the periphery,
A rotating operation plate 40 which has an outer diameter that forms a gap with the rotation guide of the support plate at the periphery and is connected to be elevating through an elastic member on the rotation plate so as to rotate with the rotation plate,
Including a pen holder plate 50 formed between the rotary operation plate and the rotary plate and provided with a plurality of pen holders each receiving the pen, while the pen draws a circle by rotation of the rotary plate and the rotary operation plate Schmidt hammer hitting point indicator for the safety diagnosis of a structure, characterized in that marking the hitting point (2). The Schmidthammer hitting point indicator for structural safety diagnosis as set forth in claim 1, comprising a fixture (21) formed on the rotation guide and preventing separation of the rotation plate. The method of claim 1 or 2, wherein the rotation guide is assembled so as to be movable along a direction transverse to the circumference from the center of the support plate to change the rotation trajectory of the rotation plate. Indicator. The safety diagnosis of a structure according to claim 1 or 2, wherein the rotation guide includes an inclined contact guide on the inner surface of the rotating operation plate to press the periphery of the rotating operation plate downward so that the pen is in close contact with the surface of the structure. Schmidthammer strike point indicator for.

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