KR101874828B1 - Device and Method for Measuring Load Carrying Capacity of a Concrete Structure - Google Patents

Device and Method for Measuring Load Carrying Capacity of a Concrete Structure Download PDF

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Publication number
KR101874828B1
KR101874828B1 KR1020170124283A KR20170124283A KR101874828B1 KR 101874828 B1 KR101874828 B1 KR 101874828B1 KR 1020170124283 A KR1020170124283 A KR 1020170124283A KR 20170124283 A KR20170124283 A KR 20170124283A KR 101874828 B1 KR101874828 B1 KR 101874828B1
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South Korea
Prior art keywords
metal plate
concrete structure
strain
load carrying
strain gauge
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KR1020170124283A
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Korean (ko)
Inventor
류택은
이종규
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주식회사 광익기술단
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Priority to KR1020170124283A priority Critical patent/KR101874828B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/002—Constructional details of contacts for gauges actuating one or more contacts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/16—Elements for restraining, or preventing the movement of, parts, e.g. for zeroising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The present invention relates to a device and a method for measuring load carrying capacity of a concrete structure. The device for measuring load carrying capacity of a concrete structure comprises: a metal plate attached to the surface of a concrete structure in a direction to measure load carrying capacity and having one or more bolt holes formed at both opposite ends of the metal plate in the direction to measure load carrying capacity; an anchoring bolt combined with an anchoring hole formed in the surface of the concrete structure after passing through the bolt hole of the metal plate to fix and integrate the metal plate to the concrete structure; and a strain gauge attached onto the metal plate to measure a strain rate of the metal plate.

Description

TECHNICAL FIELD [0001] The present invention relates to a device for measuring a load capacity of a concrete structure,

The present invention relates to an apparatus and a method for measuring a common load bearing capacity of a reinforced concrete structure at the time of diagnosing structures such as safety diagnosis.

Concrete structures require periodic safety checks or safety diagnostics for safe use. These safety inspections include visual inspection and inspection by load tests. There is a problem that the reliability of the inspection result is lowered because the inspection by the naked eye determines the necessity of repairing only by observing the appearance state. The inspection by the load test is more reliable than the inspection by the naked eye, but there is also a problem here because it is to predict the common load carrying capacity of the structure by the measured value.

That is, conventionally, in order to measure the common load carrying capacity of a concrete structure, the concrete is cut and removed so as to expose the reinforcing bars in the concrete structure, and then a strain gage is attached to the exposed reinforcing bars to measure the strain of the reinforcing bars. (Stress) applied to the test piece.

When the common load bearing capacity of the concrete structure is measured in this manner, it is troublesome to repair the damaged concrete part for the strain gauge installation later. Furthermore, in the case of high-strength concrete, there is a problem that it is not easy to repair as well as the crushing.

In case of PC (Precast) concrete, mechanical and functional damage may occur when concrete is crushed, and it is difficult to install strain gauge by concrete crushing.

In addition, there is a problem that the accuracy of the measurement is lowered due to the microcracks in the case of the concrete structure in which cracks are generated a lot.

Taking these problems into consideration, a method of installing a strain gauge without crushing concrete has been proposed, and an example thereof is disclosed in Japanese Patent Application Laid-Open No. 10-2006-0102158 (Patent Document 1).

The above patent document 1 has a strain gauge installed at the construction stage of the structure in order to secure a structural history of the structure. Specifically, a steel plate with a gauge and a pipe with a cable connected to the gauge are installed in the mold in the initial step of installing the concrete structure.

At this time, it is possible to provide a steel plate integrally formed with a fixing protrusion directly on a form, or anchor bolt may be installed on a mold first, and then a steel plate may be assembled after the structure is completed.

However, the above-mentioned Patent Document 1 does not disclose a method of installing a strain gauge from a construction stage of a concrete structure, and does not describe a method of installing a strain gauge for measuring a common load bearing capacity on a concrete structure that has already been completed .

Open Patent Publication No. 10-2006-0102158 (published on September 27, 2006) " Deformation amount and stress measurement device of structure and method of installing device for measurement "

SUMMARY OF THE INVENTION It is an object of the present invention to provide a measuring apparatus and a measuring method capable of measuring a common load bearing capacity of a concrete structure without crushing or minimizing crushing of the concrete structure.

It is another object of the present invention to provide an apparatus and method for measuring the load bearing capacity of a concrete structure that can minimize errors caused by micro-cracks when measuring a common load bearing capacity of a concrete structure with a large crack.

According to an aspect of the present invention, there is provided an apparatus for measuring a common load bearing capacity of a concrete structure according to the present invention. The apparatus includes a plurality of bearings mounted on a surface of a concrete structure along a common load carrying direction, A metal plate having one or more bolt holes formed therein; An anchoring bolt which is fixed to an anchoring hole previously formed on a surface of the concrete structure after passing through the bolt hole of the metal plate, thereby fixing the metal plate to the concrete structure and integrating it; And a strain gauge attached to the metal plate so as to measure strain of the metal plate.

Further, information on the magnitude and position of the load applied to the concrete structure for the common load carrying capacity measurement, information on the position of the reinforcing bars installed in the concrete structure, the direction of the fitting and the spacing of the fittings, A storage unit for storing information on the information; An input unit for inputting the measured value of the strain gauge; An arithmetic unit for estimating a strain and a stress of the reinforcing bar based on the information stored in the storage unit and a measured value input through the input unit; And an output unit for outputting strain and stress values of the estimated reinforcing bars.

According to another aspect of the present invention, there is provided a method for measuring a common load bearing capacity of a concrete structure, comprising: selecting a site to be subjected to structural diagnosis in a concrete structure; Selecting a concrete structure surface adjacent to the selected structural diagnostic execution site; Determining a size of a metal plate to be adhered to a surface of the concrete structure in consideration of an area of a surface of the selected concrete structure and a magnitude of a load to be applied for diagnosing the structure, and cutting the metal plate into the size; Forming one or more bolt holes in opposite ends of the metal plate; Temporarily fixing the metal plate to the surface of the selected concrete structure; Forming an anchoring hole in the concrete structure at the bolt hole position of the metal plate attached to the concrete structure; Integrating the metal plate with the concrete structure by fastening an anchoring bolt to the anchoring hole of the concrete structure; Attaching a strain gage to the metal plate integrated with the concrete structure; Measuring a strain of the metal plate due to a load applied to the concrete structure by the strain gauge; And estimating a strain and a stress of the reinforcing bar in the concrete structure based on the strain of the metal plate measured by the strain gage.

According to the apparatus and method for measuring the load-bearing capacity of a concrete structure, it is possible to minimize the damage even if the concrete structure is not broken or inevitably crushed, so that the maintenance work of the crushed concrete for the installation of the strain gage can be eliminated or minimized There is an advantage that it can be.

In addition, there is an advantage in that it is possible to measure the common load bearing capacity even when the strain gauge installation itself is difficult in the prior art such as high-strength concrete and PC concrete.

Furthermore, measurement errors due to micro-cracks in the concrete structure can be minimized, and the reliability of measurement can be further increased.

1 is a schematic view showing an embodiment of a common load bearing capacity measuring apparatus for a concrete structure according to the present invention.
2 is a schematic view showing another embodiment of an apparatus for measuring a common load bearing capacity of a concrete structure according to the present invention.
3 is a plan view of another embodiment of the apparatus for measuring a common load bearing capacity of a concrete structure according to the present invention shown in FIG.
FIG. 4 is a cross-sectional view taken along the line AA in FIG. 2 showing another embodiment of the apparatus for measuring the load capacity of a concrete structure according to the present invention.
5 is a block diagram showing another embodiment of a common load bearing capacity measuring apparatus for a concrete structure according to the present invention.
6 is a flowchart illustrating a method for measuring a common load bearing capacity of a concrete structure according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

1 is a schematic view showing an embodiment of a common load bearing capacity measuring apparatus for a concrete structure according to the present invention.

Referring to FIG. 1, a common load bearing capacity measuring apparatus for a concrete structure according to the present invention includes a metal plate 100, an anchoring bolt 200, and a strain gauge 300.

The fact that the metal plate 100 is attached to the surface of the concrete structure C along the common load carrying force measuring direction and attached along the common load carrying force measuring direction means that the length of the metal plate 100 is sufficiently secured in the common load carrying direction, ) Can be minimized due to local deformation during the measurement of the strain.

The metal plate 100 is further provided with one or more bolt holes 130 at opposite ends of the metal plate 100 in the common load carrying direction. When only one bolt hole 130 is formed at each of opposite ends of the metal plate 100 so that only one anchoring bolt 200 described later is fixed, the metal plate 100 is moved in the direction perpendicular to the common load carrying force measurement direction, May be uneven. This means that even if the position of the strain gauge 300 attached to the metal plate 100 deviates slightly, there is a possibility that the measurement value will be erroneous. Therefore, the bolt hole 130 is formed by two (See Fig. 3). When two or more bolt holes 130 and anchoring bolts 200 are provided at opposite ends of the metal plate 100, two or more strain gauges 300 are installed in a direction perpendicular to the common load carrying force measuring direction In this case, an error due to local deformation of the metal plate 100 can be minimized by taking an average value of the measured values of the strain gages 300.

The anchor bolt 200 is coupled to an anchoring hole H previously formed on the surface of the concrete structure C after passing through the bolt hole 130 of the metal plate 100 to thereby connect the metal plate 100 to the concrete structure C).

The strain gauge 300 is attached on the metal plate 100 so as to measure strain of the metal plate 100. The strain gauge 300 may be connected to an input unit 430 to be described later and input the measured value to the input unit 430.

2 to 4, another embodiment of a common load bearing capacity measuring apparatus for a concrete structure according to the present invention will be described.

3 is a plan view of another embodiment of the present invention shown in FIG. 2, and FIG. 4 is a cross-sectional view of another embodiment of the concrete load measuring apparatus of the concrete structure according to the present invention, Fig.

In this embodiment, both ends of the metal plate 100 are formed wider and wider than the middle portion where the strain gauge 300 is installed, so that the overall shape of the metal plate 100 is an English alphabet " I " 4).

By forming the both ends of the metal plate 100 for attaching the strain gauge 300 to the concrete structure C as described above, the attachment surface for attaching the metal plate 100 to the concrete is formed to be wider, It is possible to fix the metal plate 100 to the concrete structure C with a plurality of bolt holes 130 at both ends of the metal plate 100 and a plurality of anchoring bolts 200. As a result, the metal plate 100 can be more firmly attached to the concrete structure C and the metal plate 100 can be more accurately associated with the deformation of the concrete structure C as a whole, The accuracy of the common load bearing force measurement value by the gauge 300 can be increased. In the illustrated embodiment, the bolt holes 130 are provided at two ends of the metal plate 100, two in total and four in total.

In the common load bearing device of this embodiment, a reinforcing bar 110 is additionally provided at the center of the metal plate 100, and a strain gauge 300 is provided on the reinforcing bar (see FIG. 3).

In the case where only the plate-shaped metal plate 100 is provided in the concrete structure C as in the embodiment of FIG. 1, the metal plate 100 may be easily damaged when vibration or impact occurs due to an external force applied to the concrete structure C. Particularly, when the middle portion of the metal plate 100 on which the strain gauge 300 is installed is formed to be thinner than both ends, there is a problem that the portion where the strain gauge 300 is attached is more susceptible to damage.

In order to compensate for this, in this embodiment, the reinforcing bar 110 is firmly fixed to the metal plate 100 at the center portion of the metal plate 100 to which the strain gauge 300 is attached, T " shape so as to reinforce the structural strength of the metal plate 100.

5 is a block diagram showing another embodiment of a common load bearing capacity measuring apparatus for a concrete structure according to the present invention.

5, the apparatus for measuring a common load bearing capacity of a concrete structure according to the present invention may further include a storage unit 410, an input unit 430, an operation unit 450, and an output unit 470.

The storage unit 410 stores information about the magnitude and position of the load applied to the concrete structure C to measure the common load bearing capacity, the position of the reinforcement S installed in the concrete structure C, Information about the size of the metal plate 100, information about the mounting position of the metal plate 100, and the like.

The input value of the strain gauge 300 is input to the input unit 430 as described above.

The calculation unit 450 may estimate the strain and the stress of the reinforcing bar S based on the information stored in the storage unit 410 and the measured values input through the input unit 430. [

The output unit 470 visually outputs the strain and the stress value of the rebar estimated by the operation unit 450. [

A method of measuring a common load bearing capacity of a concrete structure according to the present invention will be described with reference to FIG.

In the common load carrying capacity measuring method of a concrete structure according to the present invention, a site to be subjected to structural diagnosis is selected in a concrete structure (C) (S100). Next, the surface of the concrete structure adjacent to the selected structural diagnosis performing site is selected (S110).

Next, the size of the metal plate 100 to be attached to the surface of the concrete structure is determined in consideration of the area of the surface of the selected concrete structure and the magnitude of the load to be applied for diagnosis of the structure, and the metal plate is cut in the size (S120).

One or more bolt holes 130 are formed at opposite ends of the cut metal plate 100 at S130 and the metal plate 100 having the bolt holes 130 is temporarily fixed to the surface of the selected concrete structure (S140).

An anchorage hole H is formed in the concrete structure C at a position of the bolt hole 130 of the metal plate 100 temporarily fixed to the concrete structure S150. The anchoring hole H may be formed before the temporary fixing of the metal plate 100. In this case, the metal plate 100 may be fixed to the anchor bolt 200 without being temporarily fixed to the surface of the concrete structure. There will be.

Next, the metal plate 100 is integrated with the concrete structure C by fastening the anchoring bolts 200 to the anchoring holes H of the concrete structure C (S160).

Next, a strain gauge 300 is attached to the metal plate 100 integrated with the concrete structure C at step S170. Then, a strain gauge 300 is attached to the metal plate 100 by the load applied to the concrete structure C The strain is measured by the strain gage 300 (S180).

Finally, strain and strain of the reinforcing bar S in the concrete structure C are estimated based on the strain of the metal plate 100 measured by the strain gage 300 (S190).

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the disclosed embodiments, but, on the contrary, It should be noted that the scope of the present invention is defined only by the description of the following claims.

100: metal plate 110:
130: bolt hole 200: anchoring bolt
300: strain gauge 410:
430: input unit 450:
470: Output part C: Concrete structure
H: anchorage hole S: reinforcing bar

Claims (4)

A metal plate attached to the surface of the concrete structure along a common load carrying force measuring direction and having one or more bolt holes at opposite ends thereof opposite to the common load carrying force measuring direction;
An anchoring bolt which is fixed to an anchoring hole previously formed on a surface of the concrete structure after passing through the bolt hole of the metal plate, thereby fixing the metal plate to the concrete structure and integrating it; And
A strain gauge attached to the metal plate to measure a strain of the metal plate;
, ≪ / RTI >
Wherein the metal plate has a larger and larger both end portion where the bolt hole is formed than a middle portion to which the strain gauge is attached so that the overall shape of the metal plate becomes an English alphabet "I"
Wherein the metal plate further comprises a reinforcing bar fixed to a center portion of the metal plate to reinforce the structural strength of the metal plate by forming a T-shaped cross section, the strain gauge being attached to the reinforcing bar,
Information about the size and position of the load applied to the concrete structure for the common load carrying capacity measurement, information on the position of the reinforcing bars installed in the concrete structure, Is stored;
An input unit for inputting the measured value of the strain gauge;
An arithmetic unit for estimating a strain and a stress of the reinforcing bar based on the information stored in the storage unit and a measured value input through the input unit; And
An output unit for outputting the strain and the stress value of the estimated rebar;
Wherein the load is transmitted to the concrete structure. delete delete delete
KR1020170124283A 2017-09-26 2017-09-26 Device and Method for Measuring Load Carrying Capacity of a Concrete Structure KR101874828B1 (en)

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KR1020170124283A KR101874828B1 (en) 2017-09-26 2017-09-26 Device and Method for Measuring Load Carrying Capacity of a Concrete Structure

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Application Number Priority Date Filing Date Title
KR1020170124283A KR101874828B1 (en) 2017-09-26 2017-09-26 Device and Method for Measuring Load Carrying Capacity of a Concrete Structure

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200215903Y1 (en) * 2000-08-24 2001-03-15 임재걸 Change measurement device of structure using strain guage
JP2004264022A (en) 2002-07-26 2004-09-24 Chiyoda Engineering Consultants Co Ltd Method for measuring stress of reinforcing rod, method for measuring stress of pc structure using the same and system for diagnosing deterioration of pc structure
JP2008537107A (en) 2005-03-24 2008-09-11 レニショウ パブリック リミテッド カンパニー Measuring probe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200215903Y1 (en) * 2000-08-24 2001-03-15 임재걸 Change measurement device of structure using strain guage
JP2004264022A (en) 2002-07-26 2004-09-24 Chiyoda Engineering Consultants Co Ltd Method for measuring stress of reinforcing rod, method for measuring stress of pc structure using the same and system for diagnosing deterioration of pc structure
JP2008537107A (en) 2005-03-24 2008-09-11 レニショウ パブリック リミテッド カンパニー Measuring probe

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