KR101843620B1 - Apparatus and method for evaluating wear and abrasion of slurry type TBM disc cutter - Google Patents

Apparatus and method for evaluating wear and abrasion of slurry type TBM disc cutter Download PDF

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KR101843620B1
KR101843620B1 KR1020150138591A KR20150138591A KR101843620B1 KR 101843620 B1 KR101843620 B1 KR 101843620B1 KR 1020150138591 A KR1020150138591 A KR 1020150138591A KR 20150138591 A KR20150138591 A KR 20150138591A KR 101843620 B1 KR101843620 B1 KR 101843620B1
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disk
slurry
measuring
cutter
rock specimen
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KR1020150138591A
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KR20170039799A (en
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김대영
페록 에브라힘
심보경
현기창
이준호
이재원
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현대건설주식회사
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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
    • G01N3/56—Investigating resistance to wear or abrasion
    • B01F7/16—
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10—Making by using boring or cutting machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Automation & Control Theory (AREA)
  • Fluid Mechanics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The present invention relates to a test apparatus and a test method for measuring slurry type TBM disk cutter wear. A main frame having a top plate and a bottom plate spaced apart from each other by a predetermined distance from the support column and having an upper plate and a lower plate provided on the support column; a rock specimen fixing unit for fixing the rock specimen to one side of the one surface of the lower plate; A disk rotating member for rotating the disk-shaped disk in contact with the rock specimen on the basis of a central axis; and a controller for controlling the contact force between the disk-shaped disk and the disk- An abrasion testing device including a load applying portion for performing a load application; A slurry chamber provided at one side of the lower surface of the lower plate so that the rock specimen fixing part is positioned inside and filled with slurry; A slurry tank for storing the slurry therein and supplying the stored slurry to the slurry chamber; A feed pump for providing power to feed the slurry stored in the slurry tank to the slurry chamber; And a measuring device for measuring the state of the slurry in real time, wherein the abrasion of the disc cutter can be measured in a chamber in which the disc cutter abrasion situation in the actual slurry TBM is reduced as it is and the disc cutter considering the slurry in the slurry type TBM And a test apparatus for measuring wear of a slurry type TBM disk cutter, characterized in that it is possible to estimate a wear amount and a replacement time of an accurate disk cutter.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an apparatus and a method for evaluating abrasion of slurry type TBM disk cutter,

The present invention relates to a test apparatus and a test method for measuring slurry type TBM disk cutter wear.

Recently, excavation of tunnels and underground spaces have been carried out in order to increase the stability of workers, reduce civil complaints caused by noise and vibration, reduce air and air pollution, and replace TBM And the mechanization work by the engine is greatly increased. FIG. 1A is a conceptual view of tunnel construction using a TBM (tunnel boring machine) 1. FIG. 1B is a perspective view showing the face plate 2 of the TBM equipment.

The principle of excavation of the TBM is that the disk cutter (or cutter bit) mounted on the faceplate of the TBM equipment rotates in accordance with the rotation of the face plate, thereby breaking the rock or the soil finely and excavated as it advances. Therefore, the excavation speed of TBM depends on the characteristics of rock and soil, the power of TBM (propulsion, rotational power, etc.), the size, arrangement and spacing of disc cutter installed on TBM face plate. 1C shows an actual picture of the TBM disk cutter 3. [ 1D shows a photograph of the disc cutter 3 for measuring the wear state.

The characteristics of the TBM excavation principle, in which a large number of disk cutters mounted on the TBM face plate 2 are rotated while crushing the rock or soil finely, is characterized in that the degree of abrasion of the disk cutter is determined according to the characteristics of rock or soil, It is very important to predict the abrasion of the disc cutter precisely in advance because the unit cost per unit is expensive from several million KRW to 10 million KRW depending on the size and quality of the disc keeper and 30 ~ 60 units are installed according to the TBM (1) diameter.

In addition, when the disk cutter is severely worn during the TBM construction, the drilling speed is seriously degraded. In order to replace the disk cutter, it takes at least 4 ~ 5 days while the excavation is stopped. It is very important to accurately predict and measure.

FIG. 1E is a partial cross-sectional view showing a schematic configuration of a slurry type TBM. As shown in FIG. 1E, a slurry type TBM generally corresponds to a method of stabilizing a pressed surface by pressurizing and circulating a slurry, which is a suspension containing bentonite or the like. Disc abrasion and drilling performances vary depending on the state of the slurry in the chamber (hydraulic pressure, flow rate, density, etc.), so consideration must be given to the evaluation of the disc cutter wear of the slurry type TBM.

2 is a perspective view showing a configuration of a conventional cutter wear test apparatus. As shown in FIG. 2, a test bit fixed to a lower part of a weight of 10 kg was brought into contact with a disk in parallel contact with a disk to which a female was supplied, and then the wear weight of the test bit was measured by rock powder, It can be seen that the method of obtaining the Abrasion Value Steel (AVS) is found.

However, the prior art shown in FIG. 2 requires that a rock poder be artificially generated for testing, and there is a problem that the time required is increased because the test method is very complicated. In addition, there are a few test execution institutes that apply it, the test cost is expensive, and a large amount of specimen is consumed, which is not practical.

Figure 3 also shows a cross-sectional view of a conventional cerchar abrasion test apparatus. In the prior art shown in FIG. 3, a pin subjected to a vertical load of 70 N is vertically contacted with a rock surface, and a diameter of the worn surface of the pin is measured by scratched 100 mm to obtain a ceramics wear index (CAI).

However, in the prior art shown in FIG. 3, there is a problem that the variation of the test result value is large depending on the test performer, and the accuracy of the test result is deteriorated. In addition, there is a limitation in the measurement of the wear amount by using a small steel pin different from the shape of the disc cutter, and there is a problem that the shape of the small steel pin and the shape of the actual TBM disc cutter 3 are different.

4 is a cross-sectional view of a device for measuring the degree of abrasion of general industrial equipment (bearings, other materials, etc.), in which a disk of 1 to 2 in diameter is rotated at a high speed of 10,000 RPM per minute . The test apparatus shown in Fig. 5 is also a cross-sectional view of a device for measuring the degree of wear of a general industrial device (such as a bearing or other material). The material to be tested is placed on a spring- Thereby measuring wear due to friction.

However, the test apparatuses shown in Figs. 4 and 5 are not all for measuring the abrasion of the TBM disc cutter, but for measuring the degree of abrasion of general industrial equipment (bearings, other materials, etc.) There is a problem that can not be applied to measure the wear of the TBM disk cutter.

FIG. 6 is a cross-sectional view of a testing apparatus (Registration Utility Model: No. 20-0428212) for estimating the excavation rate index, the bit wear index, or the cutter life index for the conventional tunnel boring machine design. As shown in FIG. 6, the registered utility model No. 0428212 describes a construction and a method for estimating a bore index, a bit wear index, or a cutter life index for designing a tunnel boring machine. However, The cutter wear is not measured.

Therefore, a test apparatus and a test method capable of predicting and evaluating the degree of abrasion of the slurry type TBM disk cutter according to the ground characteristics have been required quickly and precisely.

US Patent No. 2672046 U.S. Patent No. 7272969 Korean Patent No. 10-0701979 Korean Patent Publication No. 10-2009-0036503 Korean Utility Model Registration No. 20-0428212

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and a method for measuring wear of a disk cutter in a chamber, It is an object of the present invention to provide a test apparatus and a test method for estimating the amount of abrasion of a disc cutter considering slurry in slurry type TBM and a slurry type TBM disc cutter which can accurately estimate the replacement time of a disc cutter.

According to an embodiment of the present invention, there is provided a test apparatus for measuring a slurry type TBM disk cutter wear rate capable of analyzing disk cutter wear in a slurry type TBM by circulating and controlling a slurry to simulate actual circulation of the slurry, The purpose of the test method is to provide.

According to an embodiment of the present invention, it is possible to accurately estimate the amount of wear of the slurry type TBM disk cutter before or during construction, accurately calculate the amount of cutter required for the slurry type TBM project, The purpose is to shorten the construction period by optimizing the cutter intervention.

Also, according to an embodiment of the present invention, a disk-shaped steel disk similar to the shape of an actual slurry type TBM disk cutter, unlike the prior art shown in Fig. 3 using a small steel pin different from the shape of an actual TBM disk cutter, It is an object of the present invention to provide a test apparatus and a test method capable of accurately predicting the degree of abrasion of a slurry type TBM disk cutter which can increase the accuracy and reliability of slurry type TBM disk cutter wear measurement according to use .

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

A first object of the present invention is to provide a test apparatus for measuring wear of a slurry type TBM disk cutter, comprising: a main frame having an upper plate and a lower plate spaced apart from each other by a predetermined distance from the support column, A disk fixing part for fixing a disk disk to be in contact with one side of the rock specimen, and a disk fixing part for fixing the disk disk which is in contact with the rock disk to a center axis And a load applying unit for adjusting a contact force between the rock specimen and the disk-shaped disk; A slurry chamber provided at one side of the lower surface of the lower plate so that the rock specimen fixing part is positioned inside and filled with slurry; A slurry tank for storing the slurry therein and supplying the stored slurry to the slurry chamber; A feed pump for providing power to feed the slurry stored in the slurry tank to the slurry chamber; And a measuring device for measuring the state of the slurry in real time. The slurry type TBM disk cutter may be a test device for measuring wear.

The apparatus may further include a discharge pipe connecting the discharge port of the slurry chamber and the slurry tank, and a supply pipe connecting the slurry tank and the inlet of the slurry chamber, wherein the discharge pipe is provided on at least one of the discharge pipe and the supply pipe, And a control valve for controlling the flow rate of the slurry supplied into the slurry chamber.

The measuring apparatus may include a flow rate sensor for measuring a flow rate of the circulated slurry in real time, a hydraulic pressure sensor for measuring the hydraulic pressure, and a density meter for measuring the density.

The apparatus may further include an agitating device provided in the slurry tank for agitating the slurry stored in the slurry tank.

The lower plate is configured as a free end that can move up and down on the support column, and the load applying unit is composed of a weight provided between the lower plate and the upper plate, And a contact force is applied between the disc-shaped discs.

The load applying unit may include a fixed end fixed to the upper surface of the lower plate, a movable end penetrating the upper plate and movable up and down, and a moving unit moving the movable end vertically, And the contact force between the rock specimen and the disk is adjusted by changing the position of the moving end.

The disc rotating member may further include rotation means for rotating the disc rotating member.

A second object of the present invention is to provide a test method for measuring wear of a slurry type TBM disk cutter, wherein a disk-shaped disk is mounted on a disk rotating member by a disk fixing part, Fixing the plate to one side; Applying a contact force between the disk-shaped disk and the rock specimen by fixing a weight between a fixed end fixed to the upper surface of the lower plate and a movable end vertically moving through the upper plate; Rotating a disk-shaped disk by driving a disk rotating member connected to the disk fixing unit by a rotating means; And a step in which the rock specimen is cut and the disc is worn while rotating,

The applying step, the rotating step, and the abrading step,

Filling slurry stored in a slurry tank into a slurry chamber provided on one side of the lower plate so that the rock specimen fixing unit is located inside the slurry tank by driving a supply pump; And measuring a state of the slurry in real time. The method of the present invention can be used as a test method for measuring wear of a slurry type TBM disk cutter.

 The slurry chamber may further include a discharge pipe connecting the discharge port of the slurry chamber and the slurry tank, and a control valve provided in at least one of the supply pipe connecting the slurry tank and the inlet of the slurry chamber And adjusting the flow rate of the slurry.

The step of applying the contact force may further include moving the moving end to adjust the contact force between the disk and the rock specimen.

A third object of the present invention is to provide a system for analyzing a disk cutter by measuring wear of a slurry type TBM disk cutter, comprising: a support column; a lower plate having a free end vertically movable on the support column; A main frame having an upper plate provided on the support column spaced apart from each other, a rock specimen fixing unit for fixing the rock specimen to one side of the lower face of the lower plate, and a disk for fixing the disk- A disk rotating member for rotating the disk in contact with the rock specimen on the basis of a central axis; a fixed end fixed on an upper surface of the lower plate; a movable stage penetrating the upper plate to move up and down; A weight provided between the fixed end and the movable end, An abrasion testing device including a load applying section having a moving means for moving the movable end in the up and down direction and a rotating means for rotating the disk rotating member; A slurry chamber provided at one side of the lower surface of the lower plate so that the rock specimen fixing part is positioned inside and filled with slurry; A slurry tank for storing the slurry therein and supplying the stored slurry to the slurry chamber; A feed pump for providing power to feed the slurry stored in the slurry tank to the slurry chamber; A measuring device for measuring the state of the slurry in real time; A control valve for controlling the flow rate of the slurry supplied to at least one of the slurry tank and the supply pipe for connecting the inlet of the slurry chamber to the slurry tank, the discharge pipe connecting the discharge port of the slurry chamber to the slurry tank, ; And analyzing means for analyzing the abrasion degree of the disk-shaped disk worn by the rotation of the disk-shaped disk.

A pressure sensor for measuring a pressure applied to the disk; And a controller for controlling the control valve based on a value measured by the measuring device and controlling the moving means to adjust the contact force between the disk and the rock specimen And a control unit controlling the rotating means to adjust the rotational speed of the disk.

And a stirring device provided in the slurry tank for stirring the slurry stored in the slurry tank, wherein the controller controls the stirring device based on the value measured by the measuring device, A flow sensor for measuring the flow rate of the slurry circulated in real time, a hydraulic pressure sensor for measuring the hydraulic pressure, and a density meter for measuring density, wherein the analyzing means comprises: Life, and replacement timing of the disk-shaped disk based on the material of the disk, the material of the disk, the material of the rock sample, the pressure value measured by the pressure sensor, and the rotational speed of the disk.

A fourth object of the present invention is to provide a method for analyzing a disc cutter by measuring abrasion of a slurry type TBM disc cutter, comprising the steps of: determining a material of a disk-shaped disk and a rock sample to be analyzed; Mounting the determined disk to the disk rotating member by the disk fixing part, and fixing the rock specimen to one side of the lower plate by the rock specimen fixing part; Wherein a weight is fixed between a fixed end fixed to the upper surface of the lower plate and a movable end vertically moved through the upper plate, and the control unit drives the moving unit to move the movable plate between the disk- Applying a contact force to the substrate; Rotating a disk-shaped disk by driving a disk rotating member connected to the disk fixing unit by a rotating means; Wherein the rock specimen is cut and the disk is rotated while being worn; And analyzing means for analyzing the abrasion degree of the disk-shaped disk worn by rotation of the disk-shaped disk,

The applying step, the rotating step, and the abrading step,

Filling slurry stored in a slurry tank into a slurry chamber provided on one side of the lower plate so that the rock specimen fixing unit is located inside the slurry tank by driving a supply pump; And measuring the state of the slurry in real time; And a control valve provided in at least one of a supply pipe connecting the slurry tank and an inlet of the slurry chamber to connect the discharge port of the slurry chamber to the slurry tank, And adjusting the flow rate of the slurry-type TBM disk cutter.

Measuring a pressure applied to the disk by the pressure sensor; And a control unit for displaying the measured value in real time on the measuring device, controlling the control valve on the basis of the measured value in the measuring device, and controlling the moving means to control the contact force between the disk- And controlling the rotation speed of the disk-shaped disk by controlling the rotating means.

And a stirring device provided in the slurry tank for stirring the slurry stored in the slurry tank, wherein the control part controls the stirring device based on the value measured by the measuring device, and the measuring step Measuring a flow rate of the slurry through which the flow rate sensor is circulated in real time, measuring a hydraulic pressure of the slurry in real time by a hydraulic pressure sensor, and measuring the density of the slurry in real time, And a replacement period of the disk based on the material of the disk, the material of the rock specimen, the pressure value measured by the pressure sensor, and the rotation speed of the disk, And the like.

According to an embodiment of the present invention, it is possible to measure the wear of a disk cutter in a chamber in which a disk cutter abrasion situation in an actual slurry TBM is reduced as it is, thereby predicting a wear amount of a disk cutter considering slurry in a slurry type TBM, And the time can be estimated.

Also, according to one embodiment of the present invention, there is an effect that the disc cutter wear can be analyzed in the slurry type TBM by circulating and controlling the slurry and simulating the circulation of the actual slurry.

According to an embodiment of the present invention, it is possible to accurately estimate the amount of wear of the slurry type TBM disk cutter before or during construction, accurately calculate the amount of cutter required for the slurry type TBM project, It is advantageous to shorten the construction period by optimizing the cutter intervention.

Also, according to an embodiment of the present invention, a disk-shaped steel disk similar to the shape of an actual slurry type TBM disk cutter, unlike the prior art shown in Fig. 3 using a small steel pin different from the shape of an actual TBM disk cutter, It is possible to accurately predict the degree of abrasion of the slurry type TBM disk cutter, which can increase the accuracy and reliability of the slurry type TBM disk cutter wear measurement according to use, before or during construction.

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
FIG. 1A is a conceptual view of TBM tunnel construction,
1B is a perspective view of a face plate of the TBM equipment,
1C is a photograph of a TBM disk cutter,
1D is a photograph of a disc cutter for measuring wear conditions,
2 is a perspective view showing a configuration of a conventional cutter wear test apparatus,
3 is a cross-sectional view of a conventional cerchar abrasion tester,
Fig. 4 and Fig. 5 are diagrams showing the configuration of an apparatus for measuring the degree of wear of general industrial equipment (bearings, other materials, etc.)
FIG. 6 is a cross-sectional view of a test apparatus for estimating an excavation rate index, a bit wear index, or a cutter life index for a conventional tunnel boring machine design,
7 is a cross-sectional view of a test apparatus for measuring a slurry type TBM disk cutter wear rate according to an embodiment of the present invention,
8 is a cross-sectional view taken along line AA of FIG. 6 showing a main frame according to an embodiment of the present invention,
9 is a sectional view taken along the line BB of Fig. 7,
10 is a cross-sectional view taken along the line CC of Fig. 7,
11 is a DD sectional view of Fig. 7,
12 is a block diagram illustrating a control flow of a control unit according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Also in the figures, the thickness of the components is exaggerated for an effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional views and / or plan views that are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are produced according to the manufacturing process. For example, the etched area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific forms of regions of the elements and are not intended to limit the scope of the invention. Although the terms first, second, etc. have been used in various embodiments of the present disclosure to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. The embodiments described and exemplified herein also include their complementary embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, it will be appreciated by those skilled in the art that the present invention may be understood by those skilled in the art without departing from such specific details. In some instances, it should be noted that portions of the invention that are not commonly known in the description of the invention and are not significantly related to the invention do not describe confusing reasons to explain the present invention.

Hereinafter, the configuration and function of the test apparatus 100 for measuring the slurry type TBM disk cutter wear and the analysis system according to an embodiment of the present invention will be described. 7 is a cross-sectional view of a test apparatus 100 for measuring wear of a TBM disk cutter according to an embodiment of the present invention. 8 is a cross-sectional view taken along the line A-A of FIG. 7 showing a main frame 10 according to an embodiment of the present invention. 9 is a sectional view taken along the line B-B in Fig. FIG. 10 is a cross-sectional view taken along the line C-C of FIG. 7, and FIG. 11 is a sectional view taken along the line D-D of FIG.

As shown in FIG. 7, a test apparatus 100 for measuring the wear of a slurry type TBM disk cutter according to an embodiment of the present invention includes a wear test apparatus for measuring and testing wear of a slurry type TBM disk cutter using a small disk cutter , A slurry chamber 70 for simulating the actual slurry circulation state, a slurry tank 80, a feed pump 83, a measuring device 90, a control valve 74, .

As will be described later, the slurry chamber 70 is provided at one side of the lower plate so that the rock specimen fixing portion is located inside, and the slurry is filled into the inside of the slurry chamber 70.

The slurry chamber 70 is connected to the slurry supply pipe 82 at the inlet 71 side where the slurry flows and the discharge pipe 73 is connected to the discharge port 72 at which the slurry is discharged.

In addition, the slurry tank 80 stores the slurry therein, and supplies the slurry to the slurry chamber 70. And the feed pump 83 provides power for feeding the slurry stored in the slurry tank 80 to the slurry chamber 70. [

A stirring device 81 is provided in the slurry tank 80 to stir the slurry stored in the slurry tank 80.

Therefore, the actual slurry circulation is simulated by the slurry chamber 70, the slurry tank 80, the supply pipe 82, and the discharge pipe 73.

In addition, as shown in FIG. 7, a measuring device 90 for measuring the state of the slurry in real time is provided at one side of the supply pipe 82. The measuring device 90 according to an embodiment of the present invention includes a flow sensor 91 for measuring the flow rate of circulated slurry in real time, a hydraulic pressure sensor 92 for measuring the hydraulic pressure of the circulated slurry in real time, And a density meter 93 for measuring the density of the circulated slurry in real time.

7, in one embodiment of the present invention, a control valve 74 is provided at one side of the discharge pipe 73 and the supply pipe 82 to control the flow rate of the slurry supplied into the slurry chamber 70, Pressure, density, and the like.

The control unit monitors and displays the values measured in the hydraulic pressure sensor 92, the flow rate sensor 91 and the density meter 93 in real time and controls the stirring device 81 on the basis of the measured values, The degree of opening and closing of the slurry 74 is controlled, and the flow rate, pressure, density, etc. of the slurry are controlled by controlling the supply pump 83.

Hereinafter, the configuration of a wear test apparatus of a test apparatus 100 for measuring a slurry type TBM disk cutter wear rate according to an embodiment of the present invention will be described. The abrasion apparatus includes a main frame 10, a rock specimen fixing unit 31, a disk fixing unit 42, a disk rotating member 43, a load applying unit, and the like.

7 and 8, a main frame 10 according to an embodiment of the present invention includes a pair of support pillars 11, a pair of support pillars 11 spaced apart from each other by a predetermined distance, And a lower plate 13, as shown in FIG.

7, the upper plate 12 is fixed to the upper end of the support column 11, and the lower plate 13 is formed as a free end so as to be movable up and down on the pair of support pillars 11. [ do.

7 and 10, the rock specimen fixing unit 31 according to the embodiment of the present invention is configured to fix the rock specimen 30 to the lower plate 13 at one side thereof have. The rock specimen 30 applied to the test apparatus 100 for measuring the wear of the slurry type TBM disk cutter according to an embodiment of the present invention is a rock specimen which is not applied with rock powder, . The rock specimen 30 can be detached and attached, and the rock specimen 30 of the material to be analyzed can be applied without being processed into a powder.

The disk for cutting the rock specimen 30 is a disk-shaped disk 40 according to an embodiment of the present invention. Therefore, by applying a shape similar to the shape of the actual TBM disk cutter 3, accuracy and reliability can be obtained in measuring the wear of the TBM disk cutter.

As shown in FIGS. 7, 10, and 11, the disk-shaped disk 40 is contacted with the lower surface of the rock specimen 30 to rotate, thereby cutting the rock specimen 30. As a result, And is fixed to the end of the disk rotating member 43 by the fixing portion 42.

Then, by rotating the disk rotating member 43 by the rotating means 44, the disk-shaped disk 40 is rotated about the central axis. The material of the disk-shaped disk 40 is analyzed by applying the same material as the disk cutter 3 applied to the actual TBM face plate 2.

Specifically, the disk-shaped disk 40 according to an embodiment of the present invention may be made of a material such as HRC 54-56, HRC 41-43, HRC 17 or aluminum, And is detachably attached to the member (43).

In addition, the disk-shaped disk 40 according to an embodiment of the present invention preferably has a diameter of about 25 to 50 mm and a thickness of about 1.5 to 3 mm. The steel yield strength of the disk rotating member 43 is preferably 300 MPa or more.

The test apparatus 100 for measuring the wear of the TBM disk cutter according to an embodiment of the present invention includes a load applying unit for adjusting the contact force between the rock specimen 30 and the disk 40 .

Such a load applying portion may be configured to include the fixed end 21, the movable end 22, the weight 20, the moving means 23 and the like, as shown in Figs. 7, 8 and 9. As described above, the lower plate 13 is formed as a free end that can move up and down on the support column 11, and the fixed end 21 is fixed to one side of the upper surface of the lower plate 13.

It is to be noted that the moving end 22 is configured to be movable through the upper plate 12 and configured to be driven up and down by the moving means 23 as shown in Fig. As long as the moving means 23 can move and drive the moving end 22 up and down, the specific shape and configuration can be freely modified, and the scope of the right is limited by the drawings and embodiments shown in the detailed description of the invention It will not be interpreted.

9, the moving means 23 is constituted by a moving handle portion. Toothed portions are formed on the end surface side of the moving handle portion and on the outer surface of the moving end 22 to constitute a gear driving system . Therefore, the movable end 22 can be moved up and down while the gear is engaged by the driving of the movable handle portion.

A weight 20 having a specific weight is fixed between the moving end 22 and the fixed end 21. The weight of the weight 20 is used to hold the disk 40 and the rock specimen 30 The contact force is applied. In addition, by moving the movable end 22 up and down by the moving means 23, it becomes possible to adjust the contact force.

In addition, the test apparatus 100 for measuring the wear of the TBM disk cutter according to an embodiment of the present invention includes a pressure sensor 41 for measuring pressure applied to the disk-shaped disk 40 in real time .

When the load is applied by the load application unit and the disk disk 40 fixed to the disk rotating member 43 by the rotating means 44 is rotated in contact with the rock specimen 30, The disk-shaped disk 40 is worn away.

After the disc-shaped disc 40 is rotated for a predetermined time to cut the rock specimen 30, the analysis means 60 analyzes the wear rate of the worn disc-shaped disc 40.

A test apparatus 100 for measuring wear of a TBM disk cutter according to an embodiment of the present invention includes a control unit 50 to control the moving unit 23 and the rotating unit 44 before and after the test . That is, the control unit 50 controls the moving unit 23 to control the contact force between the disk-shaped disk 40 and the rock specimen 30 or to maintain the contact force at a set value, The control unit 44 controls the rotation speed of the disk-shaped disk 40 or controls the rotation speed to maintain a predetermined value.

The analyzing means 60 analyzes the material of the disc-shaped disc 40, the material of the rock specimen 30, the pressure value measured by the pressure sensor 41, and the rotational speed of the disc- The life of the disc 40, and the replacement time of the disc 40 are analyzed.

Hereinafter, a test method for measuring wear of a TBM disk cutter according to an embodiment of the present invention will be described. 12 is a block diagram showing a control flow of the control unit 50 according to an embodiment of the present invention.

First, the materials of the disk-shaped disk 40 and the rock specimen 30 to be analyzed are determined. Slurry Type TBM (1) The rock specimen 30 having the ground characteristics to be used for excavation is determined, and a disk-shaped disk 40 (see FIG. 2), which is the same material as the disk cutter 3 to be installed in the TBM face plate 2 ).

Then, the determined disk-shaped disk 40 is mounted on the disk fixing part 42, and the rock specimen 30 is fixed to the lower plate 13 by the rock specimen fixing part 31 (S2). That is, as described above, the disk-shaped disk 40 is fixed to the end of the disk rotating member 43 by the disk fixing portion 42, and the rock specimen 30 is mounted on the support column 11 vertically And is fixed to the bottom surface of the lower plate 13, which is a free end, by the rock specimen fixing part 31 so as to be movable.

The slurry stored in the slurry tank 80 is supplied into the slurry chamber 70 provided at one side of the lower plate 13 so that the rock specimen fixing unit 31 is located inside the slurry tank 80, Filled, and circulated.

The weight 20 is fixed between the fixed end 21 fixed to the upper surface of the lower plate 13 and the movable end 22 moved through the upper plate 12 to move up and down. The control unit 50 drives the moving unit 23 to move the movable stage 22 so that a contact force is applied between the disk disk 40 and the rock specimen 30. [

Then, the disc rotating member 43 connected to the disc fixing portion 42 is driven by the rotating means 44 to rotate the disc-shaped disc 40 about the center axis (S5). As the disc-shaped disc 40 is rotated, the rock specimen 30 is cut and the disc-shaped disc 40 is worn.

After the cutting of the rock specimen 30 is completed, the analyzing means 60 causes the disc-shaped disc 40, which has been worn by the rotation of the disc-shaped disc 40, ) Is analyzed.

In this process, the measuring device 90 measures the state of the slurry in real time. A discharge pipe 73 connecting the discharge port 72 of the slurry chamber 70 and the slurry tank 80 and a discharge pipe 73 connecting the slurry tank 80 and the inlet 71 of the slurry chamber 70 The flow rate of the slurry supplied into the slurry chamber 70 is controlled by the control valve 74 provided on at least one side of the supply pipe 82.

In this process, the pressure sensor 41 can measure the pressure applied to the disk-shaped disk 40, and the controller 50 drives the moving means 23 to drive the disk- The position of the movable stage 22 can be adjusted so that the contact force between the specimens 30 maintains the set contact force.

In addition, the control unit 50 may control the rotating means 44 to adjust the rotational speed of the disk-shaped disk 40. [ In addition, the control unit 50 displays the measured values in real time on the measuring device, controls the supply pump 83 and the control valve 74 based on the measured value in the measuring device, controls the moving means, The rotational speed of the disk is adjusted by controlling the contact force between the disk and the rock specimen and controlling the rotating means.

In addition, the control unit controls the stirring device 81 provided in the slurry tank 80 based on the value measured by the measuring device. The measuring device may be constituted by a hydraulic pressure sensor 92, a flow rate sensor 91 and a density meter 93. The flow rate sensor 91 measures the flow rate of the circulated slurry in real time, The hydraulic pressure sensor 92 measures the hydraulic pressure of the slurry in real time, and the density meter 93 measures the density of the slurry in real time.

The analyzing means measures the wear of the disk based on the measured value of the measuring device 90 and the material of the disk, the material of the rock, the pressure measured by the pressure sensor, and the rotational speed of the disk, Life and replacement timing.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission over the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers of the technical field to which the present invention belongs.

It should be noted that the above-described apparatus and method are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

1: CPC
2: face plate
3: Disc cutter
10: Main frame
11: support column
12: upper plate
13: Lower plate
20: Chu
21: Fixed end
22: Moving stage
23: Moving means
30: Rock specimen
31: Rock specimen fixing part
40: disk type disk
41: Pressure sensor
42: disk fixing portion
43: disk rotating member
44: rotating means
50:
60: Analysis means
70: Slurry chamber
71: inlet
72:
73: Discharge tube
74: Control valve
80: Slurry tank
81: stirring device
82: Supply pipe
83: Feed pump
90: Measuring device
91: Flow sensor
92: Hydraulic sensor
93: density meter
100: Tester for slurry type TBM disk cutter wear measurement

Claims (18)

A system for analyzing a disk cutter by measuring the wear of a slurry type TBM disk cutter,
A main frame having an upper plate and a lower plate spaced apart from each other by a predetermined distance from the support column and having an upper plate and a lower plate; a rock specimen fixing unit for fixing the rock specimen to one side of one side of the lower plate; And a load applying unit for adjusting a contact force between the rock specimen and the disk-shaped disk, and a load applying unit for adjusting a contact force between the disk specimen and the disk-shaped disk Abrasion testing equipment;
A slurry chamber provided at one side of the lower surface of the lower plate so that the rock specimen fixing part is positioned inside and filled with slurry;
A slurry tank for storing the slurry therein and supplying the stored slurry to the slurry chamber;
A feed pump for providing power to feed the slurry stored in the slurry tank to the slurry chamber;
A measuring device for measuring the state of the slurry in real time;
A discharge pipe connecting the discharge port of the slurry chamber and the slurry tank; a supply pipe connecting the inlet of the slurry tank and the slurry tank; And
A control valve provided in at least one of the discharge pipe and the supply pipe to adjust a flow rate of the slurry supplied into the slurry chamber;
An agitating device provided in the slurry tank for agitating the slurry stored in the slurry tank;
An analysis means for analyzing wear of a disk-shaped disk worn by rotation of the disk;
A pressure sensor for measuring a pressure applied to the disk; And
And rotation means for rotationally driving the disk rotating member,
Wherein the lower plate is constituted by a free end which can move up and down on the support column and the load applying part is constituted by a weight provided between the lower plate and the upper plate, Wherein the load applying unit includes a fixed end fixed to an upper surface of the lower plate, a movable end penetrating the upper plate and movable up and down, and a moving unit moving the movable end vertically And the contact force between the rock specimen and the disk is adjusted by changing the position of the moving end so as to be further fixed between the fixed end and the moving end,
The controller controls the control valve on the basis of the measured value of the measuring device and controls the moving means to adjust the contact force between the disk disk and the rock specimen And a control unit for controlling the rotating means to adjust the rotational speed of the disk,
The measuring device includes:
A flow sensor for measuring the flow rate of the slurry circulated in real time, a hydraulic pressure sensor for measuring the hydraulic pressure, and a density meter for measuring the density,
Wherein the controller controls the stirring device based on a value measured by the measuring device,
The analyzing means analyzes the value measured by the measuring device and the rotational speed of the disk based on the material of the disk, the material of the rock, the pressure measured by the pressure sensor, The life, and the replacement period of the slurry type TBM disk cutter.
delete delete delete delete delete delete A method for analyzing a disc cutter by measuring the slurry type TBM disc cutter wear through the analysis system according to claim 1,
Determining the material of the disk and the rock specimen to be analyzed;
Mounting the determined disk to the disk rotating member by the disk fixing part, and fixing the rock specimen to one side of the lower plate by the rock specimen fixing part;
The weight is fixed between a fixed end fixed to the upper surface of the lower plate and a movable end moved through the upper plate and moved up and down, and the moving unit is driven by the control unit to move the movable plate between the disk- Applying a contact force;
Rotating a disk-shaped disk by driving a disk rotating member connected to the disk fixing unit by a rotating means;
Wherein the rock specimen is cut and the disk is rotated while being worn; And
And analyzing means for analyzing wear of a disk-shaped disk worn out by rotation of the disk-shaped disk,
The applying step, the rotating step, and the abrading step,
Filling slurry stored in a slurry tank into a slurry chamber provided on one side of the lower plate so that the rock specimen fixing unit is located inside the slurry tank by driving a supply pump; And
Measuring a state of the slurry in real time; And
And a control valve provided in at least one of a discharge pipe connecting the discharge port of the slurry chamber and the slurry tank and a side of a supply pipe connecting the slurry tank and the inlet of the slurry chamber, And adjusting the flow rate of the slurry-type TBM disk cutter.
9. The method of claim 8,
And a control valve provided in at least one of a discharge pipe connecting the discharge port of the slurry chamber and the slurry tank and a side of a supply pipe connecting the slurry tank and the inlet of the slurry chamber, Further comprising the step of adjusting the flow rate of the slurry type TBM disk cutter.
9. The method of claim 8,
The step of applying the contact force includes:
And moving the moving stage to adjust the contact force between the disk-shaped disk and the rock specimen.
delete delete delete delete delete 9. The method of claim 8,
Measuring a pressure applied to the disk by the pressure sensor; And
The controller controls the control valve on the basis of the measured value in the measuring device, displays the measured value in the measuring device in real time, and controls the moving means to adjust the contact force between the disk- And controlling the rotating means to adjust the rotating speed of the disc. The method of claim 1, wherein the rotating speed of the disk-type disk is controlled by controlling the rotating means.
17. The method of claim 16,
And a stirring device provided in the slurry tank for stirring the slurry stored in the slurry tank, wherein the controller controls the stirring device based on the value measured by the measuring device,
Wherein the measuring step comprises:
The flow rate of the slurry through which the flow sensor is circulated is measured in real time, the oil pressure sensor measures the oil pressure of the slurry in real time, the density meter measures the density of the slurry in real time,
Wherein the analyzing comprises:
The wear rate, the life of the disk, and the wear rate of the disk based on the measured value of the disk and the material of the disk, the material of the disk, the pressure measured by the pressure sensor, And analyzing the replacement time of the slurry type TBM disk cutter. delete
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200428212Y1 (en) * 2006-07-25 2006-10-09 한국건설기술연구원 Test equipment for estimating excavation rate index, bit wear index or cutter life index for tunnel boring machine design
KR101439751B1 (en) 2013-03-08 2014-09-11 주식회사 포스코 Apparatus for erosion-corrosion test in aqueous slurry environment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672046A (en) 1949-11-28 1954-03-16 Grodzinski Paul Apparatus for testing the wear and abrasion resistance of materials
KR100461324B1 (en) 2002-09-30 2004-12-16 현대자동차주식회사 Apparatus for folding headrest of automobile
US7272969B2 (en) 2003-12-05 2007-09-25 E. I. Du Pont De Nemours And Company Abrasion tester and test method
KR100701979B1 (en) 2004-12-14 2007-03-30 한국건설기술연구원 Linear cutting machine for evaluating driving performance of tbm and designing cutterhead of tbm
KR100981322B1 (en) 2007-10-09 2010-09-10 재단법인서울대학교산학협력재단 Method for Planning Factors of Tunnel Excavator using a Best Mode Design Model of Tunnel Excavator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200428212Y1 (en) * 2006-07-25 2006-10-09 한국건설기술연구원 Test equipment for estimating excavation rate index, bit wear index or cutter life index for tunnel boring machine design
KR101439751B1 (en) 2013-03-08 2014-09-11 주식회사 포스코 Apparatus for erosion-corrosion test in aqueous slurry environment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
황창희, 연약지반에서 쉴드 TBM 굴착시 막장면 안정성 평가를 위한 실험적 연구, 2013년 한국철도학회 춘계학술대회 논문집, pp870-876*

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