KR102461285B1 - Compressive strength test and creep test combined measuring device - Google Patents

Abstract

The present invention relates to a measuring device capable of performing both a compressive strength test and a creep test, and as a single measuring device can simultaneously perform a compressive strength test and a creep test, it is possible to efficiently use the test room space as well as to It also has the effect of securing economic feasibility.
In addition, a high static load can be constantly generated while using a hydraulic device in the creep test, and the effect of power failure or other disturbances is reduced to increase the reliability of measurement.

Description

Compressive strength test and creep test combined measuring device

The present invention relates to a measuring device capable of performing both a compressive strength test and a creep test.

High-level waste repository structures should be evaluated for long-term health under complex deterioration conditions of heat, hydraulics, and mechanics over a very long period. Accordingly, by performing the evaluation of the soundness of the disposal materials constituting the structure such as rock and concrete, there are basically compressive strength tests and creep tests.

In order to measure mechanical properties such as compressive strength and creep of disposal materials, a tester that measures compressive strength and a tester that performs a creep test are generally used.

The compressive strength test investigates the resistance to compressive load of the waste material and its relationship to deformation and strength, etc., and the creep test increases with time when a certain load is applied to the waste material under constant temperature and humidity conditions. to investigate the transformation.

Generally, a hydraulic method is used for such a testing machine, but when using the compressive strength test, there is no problem because a dynamic load that increases with time is applied to the material to be disposed of.

However, in the creep test, since a constant static load must be applied to the material to be disposed of over time, if the hydraulic method is used, the hydraulic pressure is lost over time and the temperature of the oil increases with time due to the operation of the pump, such as viscosity/density, etc. As this changes, it is difficult to continuously apply a constant load to the disposal material.

In the creep test, the dead weight is used to apply a static load to the specimen freely from electrical disturbances or static electricity, but it is difficult to apply a high load of 100 kN or more because the load range is mainly in a small range.

The only alternative is to use a hydraulic power unit (HPU) in a creep test that lowers a high load. practically impossible by

In addition, for the compressive strength test in addition to the creep test, each tester should be prepared separately.

Therefore, there is a need to develop an apparatus capable of solving the above problems and performing both the creep test and the compressive strength test.

Patent Publication No. 10-2009-0003611 (published on January 12, 2009)

It is an object of the present invention to provide a measuring device having high reliability of measurement while performing both a compressive strength test and a creep test.

According to an aspect of the present invention, a specimen pressurizing unit including a pedestal for fixing the specimen, and a load actuator for providing a static load or a dynamic load by hydraulic pressure transmitted to the specimen from an upper portion of the pedestal; a load generating unit comprising: a mount for generating a static load for the creep test with the weight loaded from the upper part; a hydraulic device for generating hydraulic pressure for a dynamic load used in a compressive strength test and transmitting it to the load actuator through a second hydraulic pipe; and a control unit controlling the hydraulic pressure for the static load generated from the load generating unit to be transmitted to the load actuator during the creep test, and to transmit the hydraulic pressure for the dynamic load generated from the hydraulic device unit to the load actuator during the compressive strength test. ; Including, compressive strength test and creep test combined measuring device may be provided.

In addition, the mounting unit, the loading portion for mounting the weight; a column part vertically forming a slide groove and installed so that the loading part can move up and down in the slide groove; Compressive strength test and creep test including a measuring device may be provided.

In addition, the loading unit, a compressive strength test and creep test combined measuring device comprising a number corresponding to the plurality of weights to be able to hold a plurality of weights may be provided.

In addition, the weight, having a weight of various sizes, a compressive strength test and a creep test combined measuring device may be provided.

In addition, the column unit, forming fixing grooves at regular intervals in the vertical direction, and preventing the downward movement of the loading unit with a fixing pin inserted into the fixing groove, a compressive strength test and creep test combined measuring device may be provided.

In addition, according to the position of the fixing pin inserted into the fixing groove to adjust the magnitude of the static load transmitted to the load actuator, a compressive strength test and creep test combined measuring device may be provided.

In addition, the load generating unit, a loading unit installed at the lower end of the column unit to raise the mount; Further comprising a, compressive strength test and creep test combined measuring device may be provided.

In addition, the specimen pressing unit is installed between the pedestal and the load actuator to further include a chamber for forming a closed space for controlling the internal temperature and humidity, a combined compressive strength test and creep test measurement device will be provided can

In addition, the first hydraulic pipe and the second hydraulic pipe are provided with a hydraulic valve unit for controlling the flow of hydraulic pressure, and the control unit controls the flow of hydraulic pressure through opening or closing of the hydraulic valve unit, compressive strength test and creep A test and measuring device may be provided.

Compressive strength test and creep test combined measuring device according to the present invention? can simultaneously perform compressive strength test and creep test with one measuring device, so that not only can the laboratory space be used efficiently, but also economic feasibility can be secured there is

In addition, a high static load can be constantly generated while using a hydraulic device in the creep test, and there is an effect of increasing the reliability of the measurement by reducing the influence of power failure or other disturbances.

1 is a view showing a schematic diagram of a measuring device for both a compressive strength test and a creep test according to an embodiment of the present invention.
2 is a view showing a schematic configuration diagram of a measuring device for both a compressive strength test and a creep test according to an embodiment of the present invention.
3 is an enlarged view of the load generating unit of the measuring device for both the compressive strength test and the creep test according to an embodiment of the present invention.
4 is a view showing a specimen pressing unit of a measuring device for both a compressive strength test and a creep test according to an embodiment of the present invention.
5 is a view showing a chamber installed in the specimen pressing unit of the apparatus for measuring both the compressive strength test and the creep test according to an embodiment of the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This example is provided to more completely explain the present invention to those of ordinary skill in the art. Accordingly, the shape of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that the same members in each drawing are sometimes shown with the same reference numerals. In addition, detailed descriptions of well-known functions and configurations determined to unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing a schematic diagram of a measuring device for both a compressive strength test and a creep test according to an embodiment of the present invention. 2 is a view showing a schematic configuration diagram of a measuring device for both a compressive strength test and a creep test according to an embodiment of the present invention. 3 is an enlarged view of the load generating unit of the measuring device for both the compressive strength test and the creep test according to an embodiment of the present invention. 4 is a view showing a specimen pressing unit of a measuring device for both a compressive strength test and a creep test according to an embodiment of the present invention. 5 is a view showing a chamber installed in the specimen pressurizing unit of the apparatus for measuring both the compressive strength test and the creep test according to an embodiment of the present invention.

Compressive strength test and creep test combined measuring device according to an embodiment of the present invention, the pedestal 110 for fixing the specimen 10, and a static load with hydraulic pressure transmitted to the specimen 10 from the pedestal 110 upper part or a specimen pressing unit 100 including a load actuator 120 providing a dynamic load; A mount 210 for generating a static load for the creep test with the weight 20 loaded from the upper part, and a load actuator 120 to the first hydraulic pipe 230 by generating hydraulic pressure with the static load of the mount 210 a load generating unit 200 including a load transmitting unit 220 to transmit to; a hydraulic device unit 300 for generating hydraulic pressure for a dynamic load used in a compressive strength test and transmitting it to the load actuator 120 through a second hydraulic pipe 310; And during the creep test, the hydraulic pressure for the static load generated from the load generating unit 200 is transmitted to the load actuator 120, and during the compressive strength test, the hydraulic pressure for the dynamic load generated from the hydraulic unit 300 is applied. a control unit 400 for controlling transmission to the load actuator 120; includes

Compressive strength test and creep test combined measuring apparatus according to an embodiment of the present invention is composed of a specimen pressing unit 100, a load generating unit 200, a hydraulic device unit 300, and a control unit (400).

The specimen pressing unit 100 provides a load to the specimen 10 of a disposal material such as rock or concrete to be used for the test. Here, the load is a static load in the case of a creep test, and a dynamic load in the case of a compressive strength test.

The load acts on the specimen 10 by the load actuator 120 . When the specimen 10 is placed or fixed on the pedestal 110 , the load actuator 120 mounted on the upper portion of the specimen pressing unit 100 presses the specimen 10 in the vertical direction.

Here, the load actuator 120 may use a servo actuator used for the compressive strength test, and may selectively receive hydraulic pressure from the load generating unit 200 or the hydraulic unit 300 to generate a static load or a dynamic load. can

The specimen pressing unit 100 includes a pedestal 110 for fixing the specimen 10 at the lower portion, and a load actuator capable of lifting and lowering in the vertical direction to press the specimen placed on the pedestal 110 in the upper portion in the vertical direction ( 120) is provided.

That is, the specimen pressing unit 100 is a device capable of pressing the specimen 10 generally used for a creep test or a compressive strength test with a static load or a dynamic load, and a detailed description of the structure thereof will be omitted.

Here, the feature that distinguishes the specimen pressurizing unit 100 from the general device is that the load actuator 120 uses a general compressive strength test servo actuator, but does not use the hydraulic pressure generated by the hydraulic unit 300 during the creep test, That is, the hydraulic pressure generated by the separate load generating unit 200 is used. The load actuator 120 uses hydraulic pressure generated as a static load from the load generating unit 200 during the creep test, and uses hydraulic pressure generated as a dynamic load from the hydraulic system unit 300, which is a general hydraulic system, during the compressive strength test. .

As such, referring to FIG. 1 , the specimen pressing unit 100 receives hydraulic pressure from the load generating unit 200 during the creep test, and receives the hydraulic pressure from the hydraulic device 300 during the compressive strength test.

When the load generating unit 200 is described in detail with reference to FIGS. 2 to 4 , the load generating unit 200 generates hydraulic pressure of a static load used in the creep test, and is mounted on the load generating unit 200 . It is composed of a stand 210 and a load transmitter 220 installed at the lower portion. The load generating unit 200 forms a long frame in the height direction, forms a mount 210 on the upper part, and is formed in the lower part to receive the static load of the mount 210 is connected to the lower end of the mount 210 .

The mount 210 is a device for loading a weight 20 (dead weight) to generate a static load for the creep test. Here, the weight 20 (dead weight) is a load with a specific weight, such as 10 kg or 20 kg. The load is possible as long as it has the weight of metal or stone.

The mount 210 includes a loading part 211 for mounting the weight 20; a column part 212 that vertically forms a slide groove 212a and is installed so that the loading part 211 can move up and down in the slide groove 212a; includes

The loading part 211 may have a horizontal plate shape to hold the weight 20 . The loading part 211 is installed in the column part 212 having a vertical frame structure.

The column unit 212 is installed so that a pair of frames formed long in the height direction face each other, and the loading unit 211 can be moved up and down between the pair of frames. To this end, a slide groove 212a is formed in the column part 212 in a vertical direction, and both ends of the loading part 211 are installed in the slide groove 212a.

In this case, the loading part 211 is configured in a number corresponding to the plurality of weights 20 so as to be able to hold the plurality of weights 20 . That is, a plurality of loading parts 211 are installed in the column part 212 in the height direction. And a plurality of weights 20 are mounted on each loading part 211 .

In addition, the weight 20 may have a weight of various sizes. A weight 20 of a specific weight is installed in each of the plurality of loading parts 211 . Therefore, by selecting the number of loading parts 211, it is possible to generate a load of a desired size.

The column part 212 forms fixing grooves 213 at regular intervals in the vertical direction, and prevents downward movement of the loading part 211 with fixing pins 214 inserted into the fixing grooves 213 .

Fixing grooves 213 are formed on both sides of the column part 212 at regular intervals in the vertical direction. A fixing pin 214 is inserted into the fixing groove 213 to fix the loading part 211 so that the loading part 211 does not go down.

By inserting the fixing pins 214 into the fixing grooves 213 formed on both surfaces of the column part 212 , the fixing pins 214 can support the lower surface of the loading part 211 . The loading part 211 is not to go down along the slide groove 212a of the column part 212 by the fixing pin 214 .

That is, the magnitude of the static load transmitted to the load actuator 120 is adjusted according to the position of the fixing pin 214 inserted into the fixing groove 213 .

The number of the loading parts 211 is selected according to the position of the fixing pins 214 inserted into the fixing grooves 213, and the sum of the sizes of the weights 20 loaded on the loading part 211 is finally added to the mounting bracket ( 210 is to be a static load transmitted to the load actuator (120).

The load transmitter 220 receiving the load of the mount 210 may use an actuator of a general hydraulic type, and the end of the load transmitter 220 is connected to the loading unit 211 .

Since several loading parts 211 are installed in the height direction, it will be the loading part 211 located at the bottom that is connected to the load transmitter 220 . Only the loading part 211 located at the bottom is connected to the load transmitter 220 , and the other loading parts 211 placed in order on the bottom loading part 211 are the lowest loading part according to the fixing of the fixing pin 214 . (211) will be the way it is stacked.

The weight 20 serves as a hydraulic power source to push the load transmitter 220 , and pressure is generated in the load transmitter 220 by the load of the weight 20 . At this time, the load transmitter 220 is composed of a hydraulic actuator, and the pressure generated in the load transmitter 220 as much as the bore diameter of the actuator acts as the hydraulic device 300, and the specimen pressurizing part ( In a manner of applying a load to 100 ), only a load by the weight 20 of the load generating unit 200 may always be applied to the specimen 10 . Therefore, it is possible to apply a constant load to the specimen 10 without being interrupted by a power outage or other environments for a long time.

For example, in order to make a load used for a creep test of up to 200 kN, if the bore diameter of the servo actuator, which is the load actuator 120 that applies the load to the specimen 10, is 250 mm, the cross-sectional area is calculated as 490.8 cm2 . Conversely, in the formula F=A·P, the pressure required for a load of 200kN (about 20Tonf) is 40.7kgf/cm2. Based on this, the diameter of the actuator, the load transmitter 220, is selected and the size of the weight (20). to decide

When the actuator used as the load transmitter 220 is applied with a bore of 50 mm diameter, it has a cross-sectional area of 19.6 cm2, and when the total weight of the weight 20 is applied to about 785 kg, a pressure of 40.7 kgf/cm2 is generated. This is the same as the pressure generated by the hydraulic device 300 .

This is not simply for obtaining pressure, but electricity is cut off to the hydraulic device 300 during the creep test or a constant load of other disturbances can be applied to the specimen 10 .

Again, referring to FIGS. 1 and 2 , the hydraulic device 300 is configured to use a compressive strength test, generates hydraulic pressure for a dynamic load and transmits it to the load actuator 120 through the second hydraulic pipe 310 . do.

The hydraulic unit 300 is a hydraulic power unit generally used to generate hydraulic pressure. During the compressive strength test, the hydraulic pressure unit 300 transmits the hydraulic pressure to the load actuator 120 .

That is, in order to selectively perform the creep test and the compressive strength test, the hydraulic pressure generated from the load generating unit 200 is used during the creep test, and the hydraulic pressure generated from the hydraulic system unit 300 is used for the compressive strength test. will be.

To this end, the control unit 400 transmits the hydraulic pressure for the static load generated by the load generating unit 200 to the load actuator 120 during the creep test, and during the compressive strength test, the hydraulic pressure generated by the hydraulic unit 300 The hydraulic pressure for the dynamic load is adjusted to be transmitted to the load actuator 120 .

The control unit 400 adjusts the hydraulic pressure transmitted to the specimen pressing unit 100 to use the hydraulic pressure generated by the load generating unit 200 during the creep test, and transmits to the specimen pressing unit 100 during the compressive strength test. The hydraulic pressure is adjusted to use the hydraulic pressure generated by the hydraulic unit 300 .

The control unit 400 may directly control the load generating unit 200 and the hydraulic unit 300 to selectively generate hydraulic pressure.

In addition, the first hydraulic pipe 230 and the second hydraulic pipe 310 are provided with a hydraulic valve unit 500 for controlling the flow of hydraulic pressure, and the control unit 400 is the hydraulic valve unit 500 . It is also possible to regulate the flow of hydraulic pressure through opening or closing.

The control unit 400 controls the hydraulic valve unit 500 to open the first hydraulic pipe 230 and close the second hydraulic pipe 310 during the creep test, and the second hydraulic pipe 310 during the compressive strength test. It is possible to adjust the hydraulic valve unit 500 to open and close the first hydraulic pipe 230 .

At this time, in the creep test, it is necessary to raise the mount 210 upward in order to generate a load. In order to raise the mount 210, the load generating unit 200 may further include a loading unit 240 . have.

The loading unit 240 is disposed under the load generating unit 200 and is installed to raise the mounting table 210 upward. The loading unit 240 is installed at the lower end of the column unit 212 to lift the column unit 212 upward, so that the mounting table 210 can rise upward.

When the column unit 212 constitutes a pair of opposing frames, the loading unit 240 may be configured at the lower end of the pair of frames, respectively.

At this time, the loading unit 240 may be configured as an actuator using hydraulic pressure, and may transmit hydraulic pressure generated by the hydraulic unit 300 to the loading unit 240 .

That is, the loading unit 240 is raised using the hydraulic pressure of the hydraulic unit 300 , a desired load is determined, and the fixing pin 214 is inserted into the fixing groove 213 to fix the loading unit 211 . And, when the hydraulic unit 300 is stopped, the static load of the mount 210 is applied to the load transmitter 220 .

Referring to FIG. 5 , the specimen pressing unit 100 is installed between the pedestal 110 and the load actuator 120 to form a closed space for controlling the internal temperature and humidity of the chamber 130 . further includes

During the creep test, the specimen 10 is sealed with the chamber 130, and a heater 131, a circulator 132 (air circulator) , a humidity maintenance device 133, etc. are installed in the chamber 130 under a specific temperature condition ( 10~90℃) and humidity conditions (0~100%) can allow the test to be performed. In addition, it is also possible to create an environment in which constant temperature-constant humidity is maintained by using an insulator or the like.

In this way, the compressive strength test and creep test combined measuring device according to the present invention can simultaneously perform the compressive strength test and the creep test with one measuring device, so that not only can the laboratory space be used efficiently, but also economic feasibility can be secured. .

In addition, a high static load can be constantly generated while using a hydraulic device in the creep test, and the reliability of measurement can be improved by reducing the influence of power failure or other disturbances.

The embodiments of the present invention described above are merely exemplary, and those of ordinary skill in the art to which the present invention pertains will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, it will be well understood that the present invention is not limited to the forms recited in the above detailed description. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. It is also to be understood that the present invention includes all modifications, equivalents and substitutions falling within the spirit and scope of the invention as defined by the appended claims.

10: Psalm
20: weight
100: specimen pressing part
110: pedestal
120: load actuator
130: chamber
200: load generating part
210: mount
211: loading part
212: column part
212a: slide groove
212b: fixed groove
213: fixing pin
220: load transmitter
230: first hydraulic pipe
300: hydraulic unit
310: second hydraulic pipe
400: control unit
500: hydraulic valve unit

Claims (9)

a specimen pressing unit including a pedestal for fixing the specimen, and a load actuator providing a static load or a dynamic load by hydraulic pressure to the specimen from an upper portion of the pedestal;
a load generating unit comprising: a mount for generating a static load for the creep test with the weight loaded from the upper part;
a hydraulic device for generating hydraulic pressure for a dynamic load used in a compressive strength test and transmitting it to the load actuator through a second hydraulic pipe; and
a control unit configured to transmit the hydraulic pressure for the static load generated from the load generating unit to the load actuator during the creep test, and to transmit the hydraulic pressure for the dynamic load generated from the hydraulic unit to the load actuator during the compressive strength test; cast
Compressive strength test and creep test combined measuring device, including.
The method of claim 1,
The mount is
a loading unit for holding the weight;
a column part vertically forming a slide groove and installed so that the loading part can move up and down in the slide groove; cast
Compressive strength test and creep test combined measuring device including.
3. The method of claim 2,
The loading unit,
Compressive strength test and creep test combined measuring device comprising a number corresponding to the plurality of weights to be able to hold a plurality of weights.
4. The method of claim 3,
The weight, having a weight of various sizes, a combined measuring device for the compressive strength test and the creep test.
5. The method of claim 4,
The column part forms fixing grooves at regular intervals in the vertical direction,
Compressive strength test and creep test combined measuring device that prevents the downward movement of the loading part with a fixing pin inserted into the fixing groove.
6. The method of claim 5,
Compressive strength test and creep test combined measuring device for adjusting the magnitude of the static load transmitted to the load actuator according to the position of the fixing pin inserted into the fixing groove.
3. The method of claim 2,
The load generating unit,
a loading part installed at the lower end of the column part to raise the mount; cast
Further comprising, a compressive strength test and creep test combined measuring device.
The method of claim 1,
The specimen pressing unit,
Compressive strength test and creep test combined measuring device further comprising a chamber installed between the pedestal and the load actuator to form a closed space for controlling the internal temperature and humidity.
The method of claim 1,
The first hydraulic pipe and the second hydraulic pipe are provided with a hydraulic valve unit for controlling the flow of hydraulic pressure, and the control unit controls the flow of hydraulic pressure through opening or closing of the hydraulic valve unit, both compressive strength test and creep test measuring device.

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