KR101723531B1 - Casing for schmidt hammer having waterproof and dust prevention structure - Google Patents

Casing for schmidt hammer having waterproof and dust prevention structure Download PDF

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Publication number
KR101723531B1
KR101723531B1 KR1020150094188A KR20150094188A KR101723531B1 KR 101723531 B1 KR101723531 B1 KR 101723531B1 KR 1020150094188 A KR1020150094188 A KR 1020150094188A KR 20150094188 A KR20150094188 A KR 20150094188A KR 101723531 B1 KR101723531 B1 KR 101723531B1
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South Korea
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case
schmidt hammer
hammer
rod
schmidt
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KR1020150094188A
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Korean (ko)
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KR20170004189A (en
Inventor
서정민
백원대
한상훈
신창주
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한국해양과학기술원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/52—Investigating hardness or rebound hardness by measuring extent of rebound of a striking body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0083—Rebound strike or reflected energy
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0244—Tests performed "in situ" or after "in situ" use

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

A protection device for a Schmidt hammer having a waterproof and dustproof structure is disclosed. The present protection device for a schmidt hammer having a waterproof and dustproof structure is provided with a Schmidt hammer having a striking rod which is operated forward and backward so that the Schmidt hammer can be used in a contaminated construction site or in water. A cylindrical case for accommodating the case; A case head which is coupled to one end of the case while maintaining watertightness and has a draw-out hole through which the striking rod is inserted; A fixing bushing inserted into the case in a state of being coupled to the outer circumferential surface of the Schmidt hammer and fixing the Schmidt hammer to the case without being fluidized to integrate the case with the case; A case cap coupled to the other end of the case while maintaining watertightness; And a handle coupled to the outer surface of the case cap at one end thereof for pressing the case toward the hardness measurement object in a state in which the striking rod of the Schmidt hammer is drawn out and brought into contact with the hardness measurement object . According to the present invention, the handle is directly coupled to the case in which the Schmidt hammer is installed, and the striking rod is exposed by the draw-out hole formed in the case head, so that the Schmidt hammer can be safely and securely protected from foreign substances such as dust, It is possible to provide a protective effect.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a protection device for a Schmidt hammer having a waterproof and dustproof structure,

The present invention relates to a protection device for a schmidt hammer having a waterproof and dustproof structure, and more particularly, to a protection device for a schmidt hammer which has a waterproof and dustproof structure, and more particularly, And a protection device for a Schmidt hammer having a waterproof and dustproof structure that can be safely used in water.

In general, concrete is a composite material made of cement, fine aggregate and coarse aggregate, and its strength varies depending on the quality, mixing, pouring, curing, etc. of each material. Therefore, it is essential to confirm the compressive strength of concrete in order to confirm the required strength in concrete structure, durability and watertightness, to ensure uniform quality, and to carry out quality control.

It is also necessary to confirm the safety of an aged concrete structure or a damaged concrete structure.

On the other hand, it is the most accurate method to confirm the compressive strength by taking the concrete core from the structure. However, considering the limitation of the collection position and number of cores, the problems due to the partial damage of the structure, Do not use it except in very special cases. Therefore, non-destructive testing of concrete strength is used as an auxiliary means to estimate concrete strength.

Among these non-destructive tests, the Schmidt Hammer method measures rebound hardness according to the hardness of the concrete surface when the impact energy is applied to the hardened concrete surface with Schmidt Hammer (NR-10), PROCEQ SA (Switzerland) And the compressive strength of the concrete. The resilience hardness method by the Schmidt hammer can estimate the strength in a short time, and it is very useful method which can be applied to the whole structure to be.

Therefore, these Schmidt hammers are often used to test the strength of concrete structures, such as civil engineering and construction sites, or after completion.

The Schmidt hammer according to the prior art is constituted as disclosed in Korean Registered Utility Model No. 20-0201924 (Announcement: 2001.03.02). 1, the Schmidt hammer 1 is provided with a branja 2 protruding from the inner end of the housing 1, and the branja 2 is resiliently biased by the compression spring 3 A hammer 5 is formed at the rear end of the brassiere 2 with an O-ring 4 interposed therebetween. The hammer 5 is supported by a guide bar 6, a fixing plate 7 and a compression spring 8 And has a supported structure.

However, since the conventional Schmidt hammer is constructed so that it can be used only on land, there is a problem that it can not be used in water.

In other words, there is no means to measure the strength of this part, even in the presence of water in marine or harbor structures.

On the other hand, as another prior art, Korean Patent No. 10-1383766 (Publication Date: Apr. 04, 2014) discloses a waterproofing device for underwater use of Schmidt hammer. As shown in FIG. 2, a waterproofing device for underwater use of a schmidt hammer according to the related art includes a Schmidt hammer 10 having a structure in which a striking rod 14 protrudes from one side of a housing 12, 10, which comprises a body casing 20 formed into a cylindrical or polygonal cylinder shape having one side opened to receive the housing 12, and a body casing 20 which is watertightly coupled to the body casing 20 And an intermediary member (not shown) for receiving the impact rod 14 which is formed in a stretchable and forward or backward motion and which transmits the impact of the impact rod 14 to the structure between the impact rod 14 and the structure 44 extending in the longitudinal direction of the casing.

However, the waterproofing device having such a structure has a structure in which the contact portion between the medium 44 and the wrinkle stretchable and contractible portion 42, the contact portion between the second watertight means 60 and the seat groove 32, 20 and the connecting portion of the striker portion casing 30, the watertight effect is deteriorated. Since many parts are used, the structure is complicated and the maintenance performance is deteriorated There is a problem.

. Korea Registered Utility Model No. 20-0201924 (Notice: 2001.03.02) . Korean Registered Patent No. 10-1383766 (Notification date: April 4, 2014)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a schmidt hammer which is generally used on the land and which can stably use a schmidt hammer by blocking inflow of various pollutants or water in an environment exposed to water such as a contaminated environment at a construction site or a harbor structure .

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to at least partially solve the problems in the conventional arts. It can be understood.

The above object is achieved according to the present invention by providing a Schmidt hammer having a striking rod which is operated forward and backward so that the Schmidt hammer can be used in a contaminated construction site or water, Case; A case head which is coupled to one end of the case with watertightness and is provided with a medium for transmitting a striking force of the striking rod to an object to be measured; Wherein a space is formed between an outer peripheral surface of the Schmid hammer and an inner peripheral surface of the case and the outer peripheral surface of the Schmid hammer is wrapped so that the Schmid hammer can be moved forward and backward in the longitudinal direction of the case while the Schmid hammer is inserted into the case A guide bushing engaged with the guide bush; A case cap having an operating hole formed at a center thereof and coupled to the other end of the case while maintaining watertightness; And a rod coupled to the operation hole so as to be able to move forward and backward while maintaining watertightness and having one end connected to the guide bushing inside the case to forward and backward the schmidt hammer with external force And a protector for a hermetic hammer having a waterproof and dustproof structure.

In the guide bushing, two pairs of bushes formed in a semi-arcuate shape may be coupled to each other while surrounding the Schmidt hammer.

A connection jig is provided between one end of the rod and the guide bushing to uniformly transmit a force transmitted from the rod to the schmitt hammer, wherein the connection jig includes: And three to five support ends extending respectively at uniform angles around the connection portion and extending from the respective ends to the bushing so as to be bent to the side of the bushing.

In the interior of the operating hole, two to three watertight holding rings for tightly contacting the outer circumferential surface of the rod to maintain watertightness may be provided.

A watertightness maintaining protrusion having a structure that becomes thinner toward the outer circumferential surface of the rod may be formed in an annular shape on the inner circumferential surface of the operating hole between the watertight holding rings.

A handle for moving the rod forward and backward can be coupled to the other end of the rod.

 A knurling or a plurality of annular protrusions may be formed on the outer circumferential surface of the case so as to prevent slippage when the operator is attached.

The above object is achieved according to the present invention by providing a Schmidt hammer having a striking rod which is operated forward and backward so that the Schmidt hammer can be used in a contaminated construction site or water, Case; A case head which is coupled to one end of the case while maintaining watertightness and has a draw-out hole through which the striking rod is inserted; A fixing bushing inserted into the case in a state of being coupled to the outer circumferential surface of the Schmidt hammer and fixing the Schmidt hammer to the case without being fluidized to integrate the case with the case; A case cap coupled to the other end of the case while maintaining watertightness; And a handle coupled to the outer surface of the case cap at one end thereof for pressing the case toward the hardness measurement object in a state in which the striking rod of the Schmidt hammer is drawn out and brought into contact with the hardness measurement object. This is achieved by a protection device for a Schmidt hammer having a waterproof and dustproof structure.

The inner circumferential surface of the drawing-out hole may be provided with 2-3 watertight holding rings which are in close contact with the outer circumferential surface of the striking rod to maintain watertightness.

The watertightness maintaining protrusion may be formed in an annular shape on the inner circumferential surface of the draw-out hole between the watertight hold rings, the thickness of which becomes thinner toward the outer circumferential surface of the impact rod.

A pressing end may be formed at the center of the inner surface of the case cap so as to prevent the schmidt hammer from flowing toward the case head when the case cap is coupled to the case.

According to the present invention, the Schmidt hammer can be moved forward and backward within the case by the guide bushing, the guide bushing is engaged with the rod passing through the case cap, And the rod is tightly coupled to the operating hole of the case cap so as to be penetrated therethrough. Thus, the dustproof and waterproofing of the case containing the Schmidt hammer is completely performed. As a result, the Schmidt hammer, which is generally used, It is possible to provide an effect that can be stably used in a construction site or in a water environment with many dirt and the like.

In addition, it is possible to safely protect the Schmidt hammer from dust, dirt, soil, sand and water by combining the handle directly with the case where the Schmidt hammer is installed and by exposing the striking rod to the drawer formed in the case head. It is possible to provide an effect.

1 is a cross-sectional view showing a conventional Schmidt hammer.
2 is a cross-sectional view showing a waterproofing device of a Schmidt hammer according to the prior art.
3 is an exploded perspective view showing a protection device for a Schmidt hammer having a waterproof and dustproof structure according to the present invention.
4 is a perspective view showing a protection device for a Schmidt hammer having a waterproof and dustproof structure shown in FIG.
5 and 6 are operational sectional views for explaining the operation state of the protection device for a Schmidt hammer having the waterproof and dustproof structure shown in FIG.
Figs. 7 and 8 are schematic enlarged sectional views showing another embodiment of the case shown in Fig. 3. Fig.
9 and 10 are sectional views for explaining an operation state of a protection device for a Schmidt hammer having a waterproof and dustproof structure according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

FIG. 3 is an exploded perspective view showing a protection device for a schmidt hammer having a waterproof and dustproof structure according to the present invention, and FIG. 4 is an exploded perspective view showing a protection device for a schmidt hammer having the waterproof and dustproof structure shown in FIG. FIG.

3 and 4, the protection device for a Schmidt hammer having a waterproof and dustproof structure according to the present invention includes a Schmidt hammer 10 having an exposed impact rod 14, The hummer 10 includes a cylindrical case 100 for accommodating the Schmidt hammer 10 and a plurality of hammers 10 connected to one end of the case 100 while maintaining watertightness, A case head 120 provided with a medium 122 for transmitting a hitting force of the rods 14 to a hardness measurement object (an object to be measured for hardness such as concrete) The outer circumferential surface of the Schmidt hammer 10 is wrapped around the outer circumferential surface of the case 100 so as to be movable forward and backward in the longitudinal direction of the case 100 while the Schmidt hammer 10 is inserted into the case 100 The guide bushing (13 And a case cap 140 coupled to the other end of the case 100 so as to be watertightly connected to the other end of the case 100 through the operation hole 142 at the center, And a rod 150 connected to the guide bushing 130 inside the case 100 for forward and backward movement of the Schmidt hammer 10 by an external force.

This will be described more specifically.

The Schmidt hammer 10, which is generally used on land, can be applied. The Schmidt hammer 10 is provided with a striking rod 14 capable of moving forward and backward in a cylindrical body front end portion having a predetermined length and an impact force is applied to the striking rod 14, A trigger and a measuring means for measuring the hardness of the same measurement object are provided. Since the internal structure is general, a detailed description is omitted.

The case 100 is formed in a cylindrical shape having a predetermined length so that the Schmidt hammer 10 can be inserted therein.

7, a knurling 112 is formed on the outer circumferential surface of the case 100 to prevent slippage when the operator attaches the knurl, or a plurality of annular protrusions 114, as shown in Fig. 8, As shown in Fig. The knurl ring 112 and the annular protrusion 114 allow the user to stably mount the case 100.

The case head 120 is coupled to one end of the case 100 while maintaining a watertightness and an intermediate member 122 for transmitting the impact force of the impact rod 14 to an object to be measured, . The case 120 includes a water-tight O-ring 121 and is fastened to one end of the case 100. [ The medium 122 is made of a hard material for blocking the outside and inside of the case 100 and transmitting the impact force of the striking rod 14 to the hardness measurement object.

The guide bushing 130 is provided to allow the schmidt hammer 10 to smoothly move forward and backward within the case 100 by means of the rod 150. The guide bushing 130 is disposed between the outer circumferential surface of the Schmidt hammer 10 and the case 100 And the outer circumferential surface of the Schmidt hammer 10 is formed so as to be movable forward and backward in the longitudinal direction of the case 100 in a state where the Schmidt hammer 10 is inserted into the case 100 Wrapped together. As shown in FIG. 3, the guide bushing 130 is formed so that two pairs of bushings 132, each formed in a half arc shape, are coupled to each other while surrounding the Schmidt hammer 10.

The bushings 132 of the both bushings 132 are brought into close contact with each other with the respective ends of the bushings 132 opposed to each other with the schmitt hammer 10 therebetween, The hammer 10 is coupled to the hammer 10 while being tightened. Accordingly, since the two pairs of guide bushings 130 are coupled while wrapping the Schmidt hammer 10 in a state where the distance is maintained, the Schmidt hammer 10 is smoothly moved forward and backward within the case 100 . That is, since the guide bushing 130 is disposed between the outer circumferential surface of the Schmidt hammer 10 and the inner circumferential surface of the case 100, the shaking is minimized in the left, right or upward and downward directions with respect to the longitudinal direction, 10 are smoothly moved forward and backward.

The guide bushing 130 may be made of a hard synthetic resin material, and lubricant may be applied to the outer circumferential surface.

The case cap 140 is coupled to the other end of the case 100 through the operation hole 142 at the center and is coupled to the other end of the case 100. The rod 150 is coupled to the guide bushing 130 through the operation hole 142, As shown in FIG.

The case cap 140 has a plurality of O-rings 141 for water tightness and is coupled to the other end of the case 100 with a fastening structure.

In the interior of the operating hole 142, two or three watertight holding rings 144 for tightly contacting the outer circumferential surface of the rod 150 and holding the watertightness are provided, respectively. Each of the watertight holding rings 144 is in close contact with the rod 150 so that foreign matter or water does not flow into the case 100 through the operation holes 142.

On the other hand, as shown in the enlarged view of FIG. 6, the inner peripheral surface of the operation hole 142 corresponding to the space between the watertight holding rings 144 is formed with a watertight- 146 may be formed in an annular shape. The watertightness maintaining protrusions 146 may be composed of a plurality of watertightness maintaining protrusions 146, but in the present embodiment, one watertightness maintaining protrusions 146 will be described.

The rod 150 is for transmitting the operation force of the operator from the outside of the case 100 to the Schmid hammer 10 and the handle 160 is coupled to the other end. The rod 150 is coupled to the operation hole 142 of the case cap 140 so as to be able to move forward and backward while maintaining watertightness and one end of the rod 150 is connected to the guide bushing 130 inside the case 100 And is configured to advance and retract the Schmidt hammer 10 by an external force.

That is, one end of the rod 150 is inserted into the case 100 through the operation hole 142 and coupled to the guide bushing 130. Therefore, when the rod 150 is advanced by using the handle 160 provided at the other end, the Schmidt hammer 10 can be advanced inside the case 100.

A connection jig 180 is provided between one end of the rod 150 and the guide bushing 130 to uniformly transmit the force transmitted from the rod 150 to the schmid hammer 10.

The connecting jig 180 includes a connecting portion 182 to which one end of the rod 150 is connected at the center and a connecting portion 182 that extends at a uniform angle around the connecting portion 182 and which are respectively connected to the guide bushing 130 And three to five support ends 184 that are bent and joined to the side surfaces of the guide bushing 130.

In the present embodiment, the supporting ends 184 are formed to have a total of "+" shapes. However, the present invention is not limited thereto. . This structure is for uniformly transferring the pressing force of the rod 150 to the guide bushing 130 having a circular shape. That is, the pressing force of the rod 150 is uniformly transmitted to the four guide bushings 130 around the connecting portion 182.

One end of the connecting member 180 and one end of the rod 150 may be fastened and joined together and the end of each supporting end 184 may be connected to the side of the guide bushing 130 located on the case cap 140 side, The rod 150 and the connecting jig 180 and the guide bushing 130 can be integrated by being fastened to the bolt hole formed at the end of each supporting end 184 on the guide bushing 130 side in the contacted state.

The operation of the present invention configured as above will be described.

5, when the operator 122 contacts the surface of the object to be measured of hardness, for example, concrete, and the striking rod 14 is pulled out, the worker mounts the case 100 with one hand And hold the handle 160 with the other hand.

The pushing force of the rod 150 is uniformly transmitted to the guide bushing 130 through the connecting jig 180 so that the Schmidt hammer 10 is advanced.

6, the striking rod 14 is inserted into the inside of the Schmidt hammer 10, and as a result, the inside trigger device 10 (Not shown) generates a repulsive force in the striking rod 14, and the repulsive force of the striking rod 14 is sensed by the Schmid hammer 10.

When the measurement is completed by the above-described procedure, when the handle 160 is held and the rod 150 is moved backward, the Schmidt hammer 10 is guided by the guide bushing 130 inside the case 100, do.

Since the watertight holding ring 144 is in close contact with the outer circumferential surface of the rod 150 during the forward and backward movement of the rod 150 so that watertightness can be maintained and the case head 120 is provided with the medium 122, (14) is not exposed to the outside, watertight performance can be improved.

9 and 10, according to another embodiment of the present invention, a protection device for a Schmidt hammer having a waterproof and dustproof structure includes a Schmidt bar having a striking rod 14 that is operated forward and backward, The hummer 10 is installed in the case 100 so as to enable the use of the schmidt hammer 10 in a contaminated construction site or underwater. The hummer 10 includes a cylindrical case 100, A case head 120 which is coupled with the water hammer 10 at a watertight state and which has a lead-out hole 124 through which the striking rod 14 is inserted, Shaped fixing bushing 135 for fixing the Schmid hammer 10 to the inside of the case 100 without being flowed so as to integrate the case 100 and the Schmid hammer 10, The watertightness is maintained at the other end, And one end of which is coupled to the outer surface of the case cap 140 to allow the impact rod 14 of the Schmidt hammer 10 to be pulled out to contact the hardness measurement object, And a knob 160 for moving and pushing the hardness measurement object toward the hardness measurement object.

At this time, the inner circumferential surface of the drawing hole 124 may be provided with 2-3 watertight holding rings 126 for tightly contacting the outer circumferential surface of the striking rod 14 to maintain watertightness. The watertight holding rings 126 are partially inserted into the mounting groove 124A formed in the inner surface of the drawing hole 124. [ The watertight holding rings 126 may be formed in a polygonal shape having a circular or rectangular cross section.

When the case cap 140 is coupled to the case 100 on the inner surface of the case cap 140, the end of the Schmidt hammer 10 is pressed toward the case head 120 so that the Schmidt hammer 10 A pressing end 143 is formed so as not to flow. By this pressing end 143, the Schmid hammer 10 is pressed toward the case head 120, and the flow is prevented.

On the other hand, as shown in the original drawing (the watertight means is shown in another embodiment) of FIG. 10, the inner peripheral surface of the draw-out hole 124 corresponding to the space between the watertight holding rings 126, The watertightness maintaining protrusion 128 of the thinned structure can be formed in an annular shape and can be brought into close contact with the striking rod 174. The watertightness maintaining protruding portion 128 serves to maintain the watertightness between the draw-out hole 124 and the striking rod 14 together with the watertight holding ring 126.

The operation of the protection device for the Schmidt hammer having the waterproof and dustproof structure thus constructed will now be described.

9, when the user attaches the handle 160 with the other hand while the case 100 is attached with one hand and the end of the striking rod 14 drawn out through the take-out hole 124 To be brought into contact with the hardness measurement object.

10, when the handle 160 and the case 100 are moved toward the object to be measured and pressed, the striking rod 14 is inserted into the Schmidt hammer 10, and then the trigger device A repulsive force is generated in the impact rod 14 and the hardness of the object to be measured is measured by sensing the Schmidt hammer 10.

In this way, only the striking rod 14 is exposed to the take-out hole 124 in a state where the Schmidt hammer 10 is received in the case 100 and fixed by the fixing bushing 135 without flowing, The Schmidt hammer 10 can be used stably in a construction site on the land or in the water exposed to foreign matter, dirt, sand or the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.

10: Schmidt Hammer 14: Strike Rod
100: Case 120: Case head
124: Draw-out ball 124A: Installation groove
126,144: Watertight retaining ring 128,146: Watertight retaining projection
130: guide bushing 132: bushing
135: Fixing bushing 140: Case cap
142: operating hole 143: pressure stage
150: Load
160: handle 180: connection jig \
182: connecting portion 184: supporting end

Claims (11)

A Schmidt hammer having a striking rod that is operated forward and backward so that the Schmidt hammer can be used in a contaminated construction site or in water,
A cylindrical case for accommodating the Schmidt hammer; A case head which is coupled to one end of the case with watertightness and is provided with a medium for transmitting a striking force of the striking rod to an object to be measured; Wherein a space is formed between an outer peripheral surface of the Schmid hammer and an inner peripheral surface of the case and the outer peripheral surface of the Schmid hammer is wrapped so that the Schmid hammer can be moved forward and backward in the longitudinal direction of the case while the Schmid hammer is inserted into the case A guide bushing engaged with the guide bush; A case cap having an operating hole formed at a center thereof and coupled to the other end of the case while maintaining watertightness; And a rod coupled to the operation hole so as to be able to move forward and backward while maintaining watertightness and having one end connected to the guide bushing inside the case to advance and retract the schmidt hammer with external force ,
The guide bushing includes two pairs of bushes formed in a semi-arcuate shape,
A connecting jig is provided between one end of the rod and the bushing to uniformly transmit a force transmitted from the rod to the schmitt hammer,
The connecting jig,
A connecting portion to which one end of the rod is coupled at the center; And three to five support ends extending respectively at uniform angles around the connection portion and extending from the respective ends to the bushing so as to be bent to the side surfaces of the bushing.
Protective device for Schmidt hammer with waterproof and dustproof structure. delete delete The method according to claim 1,
Inside the operating hole,
And two to three watertight retaining rings are provided in close contact with the outer circumferential surface of the rod to maintain watertightness.
Protective device for Schmidt hammer with waterproof and dustproof structure. 5. The method of claim 4,
And an inner peripheral surface of the operation hole corresponding to the space between the watertight holding rings,
Characterized in that the watertightness maintaining projection having a structure that becomes thinner towards the outer circumferential surface of the rod is formed in an annular shape.
Protective device for Schmidt hammer with waterproof and dustproof structure. The method according to claim 1,
At the other end of the rod,
Characterized in that a handle is coupled to move the rod forward and backward.
Protective device for Schmidt hammer with waterproof and dustproof structure. 7. The method according to any one of claims 1 to 6,
On the outer circumferential surface of the case,
Characterized in that a knurling or a plurality of annular protrusions for preventing slippage when the operator is attached is protruded.
Protective device for Schmidt hammer with waterproof and dustproof structure. A Schmidt hammer having a striking rod that is operated forward and backward so that the Schmidt hammer can be used in a contaminated construction site or in water,
A cylindrical case for accommodating the Schmidt hammer;
A case head which is coupled to one end of the case while maintaining watertightness and has a draw-out hole through which the striking rod is inserted;
A fixing bushing inserted into the case in a state of being coupled to an outer circumferential surface of the Schmidt hammer and fixing the Schmidt hammer to the case without being fixed to the case and integrating the Schmidt hammer with the case;
A case cap coupled to the other end of the case while maintaining watertightness; And
And a handle coupled to one end of the case cap to press the case toward the object to be measured in a state in which the striking rod of the Schmidt hammer is drawn out and brought into contact with the object for hardness measurement.
Protective device for Schmidt hammer with waterproof and dustproof structure. 9. The method of claim 8,
On the inner circumferential surface of the drawing-out hole,
And two or three watertight retaining rings for tightly holding the watertight seal on the outer circumferential surface of the impact rod.
Protective device for Schmidt hammer with waterproof and dustproof structure. 10. The method of claim 9,
And an inner peripheral surface of the draw-out hole corresponding to between the watertight holding rings,
Characterized in that the watertightness maintaining projection of the structure that becomes thinner toward the outer circumferential surface of the striking rod is formed in an annular shape.
Protective device for Schmidt hammer with waterproof and dustproof structure. 9. The method of claim 8,
At the center of the inner surface of the case cap,
And a pressing end protruding from the case head to press the schmidt hammer toward the case head when the case cap is coupled to the case.
Protective device for Schmidt hammer with waterproof and dustproof structure.

KR1020150094188A 2015-07-01 2015-07-01 Casing for schmidt hammer having waterproof and dust prevention structure KR101723531B1 (en)

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CN110132720B (en) * 2019-06-10 2021-12-21 淮安市水利工程建设管理服务中心 Underwater resiliometer for detecting strength of underwater concrete and method thereof
KR102189475B1 (en) * 2020-08-25 2020-12-11 (사)한국건설안전협회 Test Anvil For Schmidt Hammers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200201924Y1 (en) 1997-10-01 2001-03-02 김헌출 Schmidt hammer tester
JP2006349566A (en) 2005-06-17 2006-12-28 Nodakku Kk Test hammer for underwater evaluation and concrete compression strength evaluation method
KR101383766B1 (en) * 2012-11-20 2014-04-10 한국해양과학기술원 Waterproof casing for underwater usage of schmidt hammer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200201924Y1 (en) 1997-10-01 2001-03-02 김헌출 Schmidt hammer tester
JP2006349566A (en) 2005-06-17 2006-12-28 Nodakku Kk Test hammer for underwater evaluation and concrete compression strength evaluation method
KR101383766B1 (en) * 2012-11-20 2014-04-10 한국해양과학기술원 Waterproof casing for underwater usage of schmidt hammer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
최형식. 방수형 경량 로봇팔의 설계 연구. 한국해양공학회지 : 한국해양공학회. 2013년04월, 제27권제2호, pp100-106 끝.*

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