JP6418519B2 - Ground displacement measuring device and displacement measuring method - Google Patents

Description

  The present invention relates to a ground displacement measuring apparatus and a displacement measuring method for measuring ground displacement associated with excavation when excavating a tunnel by a mountain tunnel method or the like.

  In tunnel excavation work using the mountain tunnel method, etc., after blasting the ground with a drilling machine, etc., concrete is sprayed on the inner peripheral surface of the tunnel, and reinforcing materials such as rock bolts are radially embedded in the surrounding ground. We will dig toward the front of the face while reinforcing.

  In tunnel excavation work such as the mountain tunnel method, the deformation of the ground in front of the face and the existing excavation section can be controlled by measuring the displacement of the ground in front of the face over time and performing appropriate reinforcement based on the displacement data. Therefore, the measurement of ground displacement is important.

  As a ground displacement measuring device for measuring the displacement of the ground in front of the face, provided with a displacement measuring means for detecting the displacement of the ground for each of a plurality of measurement points set in a test hole provided in the ground in front of the face, As the excavation progresses, when the ground in front of the face is displaced, the shape of the test hole changes, the displacement associated with the change is detected at each measurement location by the displacement measuring means, and the displacement is converted into an electrical signal. Are known.

  The displacement measuring means includes a measuring unit anchor fixed to the ground at each measurement location, a plurality of rod-shaped displacement transmitting members each having one end fixed to each measuring unit anchor, and the other end of the displacement transmitting member connected to each other. A displacement meter that detects the displacement of the ground at the measurement location via the transmission member and converts the displacement amount into an electrical signal. The displacement meter is accommodated in a casing disposed at the innermost part of the test hole, and the casing is an anchor. (See, for example, Patent Document 1).

  Further, the casing is provided with recording means such as a data logger, and the displacement data output from the displacement measuring means is sequentially recorded on the recording means.

  With respect to the recording data recorded in this recording means, conventionally, after digging until the face position reaches the vicinity of the casing, the recording means such as a data logger is excavated and collected, and the collected recording means such as the data logger is recorded. A method of reading recorded data by connecting a reading device (hereinafter referred to as a recovery type recording data acquisition method) was common, but as another method of acquiring recording data, a cable for reading data from a recording means such as a data logger was used. A method of reading out the recorded data by connecting the reading terminal to this cable at the desired timing (hereinafter referred to as cable-type recorded data acquisition method) or transmission provided in the casing. Connect a data logger to the machine, and send recorded data from the transmitter to the receiver installed in the tunnel using radio waves. Method (hereinafter, referred to as wireless recording data acquisition method (e.g., see Patent Document 2)) has also been developed.

JP 2004-316117 A JP 2009-299316 A

  However, in the conventional collection-type record data acquisition method, the data logger is collected because the recording means such as the data logger cannot be excavated and collected until after the face position reaches the vicinity of the casing. Until then, the displacement data could not be confirmed, and the displacement data could not be reflected in the excavation work.

  Further, in the conventional collection-type recording data acquisition method, there is a possibility that the recording means is damaged when the recording means such as a data logger is dug, and all the recorded data is lost.

  On the other hand, in the conventional cable-type record data acquisition method, an operator enters under an unstable face immediately after excavation, and it is necessary to connect a reading terminal to the data reading cable. There are concerns.

  In addition, in the conventional cable type recording data acquisition method, the data reading cable is cut together with the displacement transmitting member etc. every time the digging is performed, so if a problem occurs when the cable is cut, the reading terminal cannot be connected thereafter. Recorded data could not be obtained.

  In the conventional wireless recording data acquisition method, it is necessary to transmit radio waves at high power because it is transmitted to a receiver placed in front of the face that is far away from the transmitter installed in the ground. There was a problem that a high-performance transmitter / receiver was required and the equipment cost increased.

  In addition, in the conventional wireless recording data acquisition method, radio waves are transmitted at a higher output than the transmitter, so that the radio waves may affect the equipment used for tunnel excavation work. There was also a risk of being regulated by laws related to the use of radio waves such as the Radio Law.

  Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a ground displacement measuring device and a displacement measuring method capable of safely obtaining time-dependent displacement of the ground during excavation work as needed. It is.

The feature of the invention according to claim 1 for solving the conventional problems as described above is that the displacement of the ground is detected for each of a plurality of measurement points in the test hole provided in the ground in front of the face, and the amount of displacement is calculated. In the ground displacement measuring apparatus provided with a displacement measuring means for converting to an electrical signal and outputting it, a plurality of RFID information storage media for recording the electrical signal output from the displacement measuring means as displacement data are the test boreholes. Displacement measurement of the ground provided with a non-contact type data reader capable of reading out the displacement data from the RFID information storage medium located near the face by short - range non-contact communication. In the device.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the information storage medium is installed at each measurement location.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the displacement measuring unit includes a measurement unit anchor fixed to the ground at each measurement location, and one end at each measurement unit anchor. A plurality of fixed displacement transmission members and the other end of each displacement transmission member are connected, and the displacement of the ground at each measurement location is detected via each displacement transmission member, and the amount of displacement is converted into an electrical signal. A displacement meter, and the displacement meter is disposed in the innermost part of the borehole.

  According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the non-contact data reader includes a read unit having a read antenna, and the read unit is wired. The reader body to be connected is provided, and the reading unit is provided with a remote control rod fixed to the tip.

A feature of the invention described in claim 5 is that a test hole is drilled in the ground in front of the face, a displacement measuring means is installed in the test hole, and the displacement of the ground is measured at each of a plurality of measurement points in the test hole. In the ground displacement measuring method for detecting ground displacement in front of the face due to excavation by detecting and converting the displacement amount into an electrical signal and outputting the electrical signal, the displacement measuring means for each desired position in the test hole An RFID information storage medium that stores the electrical signal output from the sensor as displacement data is installed, and the displacement data recorded in the information storage medium for RFID located near the face after excavation is contactless data There is a method for measuring the displacement of the ground which is read by a short distance non-contact communication with a reader.

  According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, the non-contact data reader includes a read unit having a read antenna, and a reader main body to which the read unit is connected by wire. The reading unit includes a remote control rod fixed to the tip, and the remote control rod is used to bring the reading unit close to the information storage medium located near the face after excavation.

As described above, the ground displacement measuring apparatus according to the present invention detects the ground displacement for each of a plurality of measurement locations in the test hole provided in the ground in front of the face, and converts the displacement amount into an electrical signal. In the ground displacement measuring device including the displacement measuring means for outputting, a plurality of RFID information storage media for recording the electrical signals output from the displacement measuring means as displacement data for each desired position in the borehole. And a non-contact type data reader that can read out the displacement data from the information storage medium for RFID located near the face by short - range non-contact communication. In addition, changes in the ground can be grasped over time, and displacement data can be immediately reflected in excavation work and the like. Further, it is possible to perform work efficiently without requiring complicated work such as cable connection work under an unstable face. Furthermore, since data is read by short-range non-contact communication, it is not subject to regulations such as the Radio Law.

  Moreover, in this invention, each information storage medium can be installed suitably by installing each said information storage medium for every said measurement location.

  Further, in the present invention, the displacement measuring means includes a measurement unit anchor fixed to the ground at each measurement location, a plurality of displacement transmission members having one end fixed to each measurement unit anchor, and each displacement transmission member. And a displacement meter that detects the displacement of the ground at each measurement location via each displacement transmission member and converts the amount of displacement into an electrical signal, the displacement meter being the deepest of the borehole By being arranged in the section, the ground displacement at each measurement location can be accurately measured.

  Furthermore, in the present invention, the non-contact type data reader includes a reading unit having a reading antenna, a reader main body to which the reading unit is connected by wire, and a remote operation unit in which the reading unit is fixed to the tip. By including the rod, the displacement data can be safely read from the information storage medium without an operator entering the unstable face immediately after excavation.

Further, in the ground displacement measuring method according to the present invention, a borehole is drilled in the ground in front of the face, a displacement measuring means is installed in the borehole, and the ground is measured for each of a plurality of measurement locations in the borehole. In a ground displacement measurement method for measuring ground displacement in front of a face due to excavation by detecting displacement and converting the displacement amount into an electrical signal and outputting the electrical signal, the displacement at each desired position in the trial hole An RFID information storage medium for storing the electrical signal output from the measuring means as displacement data is installed, and the displacement data recorded on the RFID information storage medium located near the face after excavation is contactless. By reading out by a short - range non-contact communication with a formula data reader, it is possible to perform work safely and efficiently without the need for complicated work such as cable connection work under an unstable face. In addition, use is not restricted by the Radio Law.

  In the present invention, the non-contact data reader includes a reading unit having a reading antenna, a reader main body to which the reading unit is connected by wire, and a remote operation unit in which the reading unit is fixed to the tip. The displacement data is read without an operator entering the unstable face by using the remote control rod to bring the reading unit close to the information storage medium located near the face after excavation. Can work safely.

It is sectional drawing which shows the outline of the usage condition of the displacement measuring apparatus of the ground which concerns on this invention. It is a block diagram which shows the structure of the displacement measuring apparatus of a ground same as the above. It is a partially broken side view which shows the front-end | tip part of the displacement measuring means in FIG. It is a side view which shows the measurement point part of the displacement measurement means in FIG. It is a side view for demonstrating the measurement principle of the ground displacement measuring apparatus same as the above. It is sectional drawing which shows the state dug up from the state of FIG. It is a graph which shows an example of the display form of a measurement result.

  Next, embodiments of the ground displacement measuring apparatus according to the present invention will be described based on the embodiments shown in the drawings.

  In this embodiment, the ground displacement measuring device according to the present invention is used for tunnel excavation work by a mountain tunnel method or the like. In the figure, reference numeral 1 denotes a face, reference numeral 2 denotes the ground in front of the face 1, Reference numeral 3 denotes a test hole drilled in the ground 2 in the direction of excavation.

  This ground displacement measuring device detects the displacement of the ground 2 for each of a plurality of measurement points P1 to P6 in the trial hole 3, converts the displacement amount into an electrical signal, and outputs the displacement measuring means 4 that outputs the displacement measurement means 4. Prepared in.

  In addition, the displacement measuring apparatus includes information storage media 5a to 5f for recording electric signals output from the displacement measuring means 4 as displacement data for each desired position P1 to P6 in the test hole 3, and immediately after excavation. 1 is provided with a non-contact type data reader 6 capable of reading displacement data from the information storage media 5a to 5f (information storage medium 5a in FIG. 1) located in the vicinity of the face 1 by non-contact communication.

  Note that the vicinity of the face here is not necessarily limited to a range including only the position of the information storage medium (RF tag 5a in FIG. 1) closest to the face 1 and is not contacted with the non-contact type data reader 6. The range includes the positions of all information storage media capable of communication.

  The displacement measuring means 4 includes measuring unit anchors 7, 7... That are fixed to the ground 2 at each of the measurement points P1 to P6, and a plurality of displacement transmissions whose one ends are fixed to the measuring unit anchors 7, 7. The members 8a to 8f are connected to the other ends of the displacement transmitting members 8a to 8f, and the displacement of the ground 2 at each of the measurement points P1 to P6 is detected via the displacement transmitting members 8a to 8f, and the displacement amount is obtained as an electric signal. As shown in FIG. 3, the displacement meter 9 is accommodated in a cylindrical casing 10 disposed at the innermost part of the trial hole 3, and is disposed at the innermost part of the experimental hole 3. It is arranged.

  Further, a recording means 11 such as a data logger is also accommodated in the casing 10, and a displacement meter 9 is connected to the recording means 11 by wire.

  In addition, the casing 10 is comprised by cylindrical members, such as an acrylic pipe and a metal pipe, and is provided with the waterproof structure which prevents the inundation from the outside.

  Further, the casing 10 is provided with a casing fixing means 12 having anchor members 12a, 12a,..., Whose rear ends expand toward the hole diameter direction by supplying a fluid such as high-pressure water at the rear end portion. The accommodated displacement meter 9 and recording means 11 can be fixed so as to be immovable in the front-rear direction with respect to the ground at the innermost portion of the test hole 3.

  As shown in FIG. 4, the meter-side anchor 7 includes a tubular anchor case 13 and a widening operation unit 14 fixed to the outside of the anchor case 13 so as to expand or expand in the hole diameter direction. By pressing 14 against the inner peripheral surface of the test hole 3, it is firmly fixed to the ground so as not to move in the front-rear direction. For example, a hydraulic anchor is used.

  The anchor case 13 is formed in a cylindrical shape with open front and rear ends, and includes a fixture (not shown) that fixes one end of desired displacement transmitting members 8a to 8f to the inner peripheral surface of the case. Each displacement transmission member 8a-8f is inserted.

  The widening operation unit 14 is configured by a C-shaped structure in which a brass flat plate having a hollow structure is curved in a C shape, for example, and supplies fluid such as water or cement milk into the C-shaped structure. When the pressure is applied, the C-type structure is expanded in the hole diameter direction and pressed against the inner peripheral surface of the test hole 3.

  The displacement transmitting members 8a to 8f are each formed in a rod shape or a wire shape having different lengths, and are made of a material such as FRP that can be cut along with blasting or excavation by an excavator.

  Each of the displacement transmission members 8a to 8f has one end fixed to the measurement unit anchors 7, 7... And the other end connected to and fixed to the displacement meter 9. The measurement unit anchor 7 is connected via the displacement transmission members 8a to 8f. , 7... Can be detected by a displacement meter 9 at each of the measurement points P1 to P6.

  The displacement meter 9 includes a plurality of detection units to which the respective displacement transmission members 8a to 8f are connected, and the detection unit converts the displacement associated with the axial movement of the connected displacement transmission members 8a to 8f into an electrical signal. A conversion structure is provided, and a potentiometer system, a strain gauge system, a differential transformer system, a pressure conversion system, a magnetic conversion system, a capacity conversion system, and the like can be used.

  The information storage media 5a to 5f are tag-like RF tags that can read and write data in a built-in memory by non-contact short-distance communication using radio waves (electromagnetic waves). As shown in FIG. A memory unit 15 for storing information, a control circuit unit 16 for information processing, and an antenna unit 17 connected to the control circuit are provided.

  Here, the RF tags 5a to 5f refer to information storage media used for RFID (Radio Frequency Identification), and include what are called IC tags, wireless tags, RFID tags, and the like.

  The RF tags 5a to 5f are preferably so-called passive types that do not have a built-in power source such as a battery. By receiving radio waves from the antenna 20a of the non-contact type data reader 6, the RF tags 5a Electric power is generated in the antenna unit 17 of ˜5f, and the control circuit unit 16 and the memory unit 15 are operated by this electric power to perform necessary processing.

  Each of the RF tags 5a to 5f is, for example, fixed in the anchor case 13 of the measurement unit anchors 7, 7... Installed at the measurement points P1 to P6, and is inserted into the anchor case 13, respectively. Is connected to the displacement measuring means 4 by wire, displacement data is transmitted from the displacement measuring means 4 as needed, and the displacement data is stored in the memory unit 15.

  The non-contact type data reader 6 is an RFID reader, and includes a reading unit 20 having a reading antenna 20a and a reader main body 21 to which the reading unit 20 is connected by wire. The displacement data stored in the RF tags 5a to 5f can be read out by short-range non-contact communication by bringing the tags 5a to 5f closer to a predetermined distance range.

  The non-contact type data reader 6 includes a reading unit 20 and a reader body 21 as separate units, and also includes a rod-shaped remote control rod 22 having a certain length. A reading unit 20 is fixed at the tip, and data can be read from a position away from the face 1 by a certain distance using the remote control rod 22.

  The reader body 21 uses an information terminal including a central processing unit (CPU), a storage unit such as a memory, and a monitor. The information terminal analyzes and displays information, or transmits displacement data read to an external device. Can be done.

  Next, a ground displacement measuring method using the above-described ground displacement measuring apparatus will be described. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned Example.

  In the method of the present invention, first, the front ground 2 is drilled in the horizontal direction to form a test hole 3 for measurement.

  This trial hole 3 is drilled until it reaches a position that is sufficiently distant from the face 1 and that is not affected by excavation, the non-displacement point P0.

  Next, the displacement measuring means 4 is installed in the trial hole 3.

  The displacement measuring means 4 is inserted into the borehole 3 from the casing 10 side in which the recording means 11 such as a data logger and the displacement gauge 9 are accommodated, and the displacement gauge 9 and the recording means 11 are installed in the innermost part of the borehole 3. In addition, the measurement unit anchors 7, 7... Are arranged at predetermined positions.

  First, the casing 10 is fixed to the ground 2 by the casing fixing means 12, and the displacement meter 9 and the recording means 11 accommodated in the casing 10 are moved in the front-rear direction with respect to the ground 2 at the innermost portion of the test hole 3. It is fixed so that it cannot move, and then the measuring section anchors 7, 7... It is fixed for each of a plurality of measurement points P1 to P6 set inside.

  At that time, as shown in FIG. 5, each of the meter side portions P1 to P6 is positioned at a desired distance L1 to L6 from the face 1, and the displacement meter 9 has a sufficient distance L0 from the face 1. It is positioned at a non-displacement point P0 that is not affected by excavation.

  Accordingly, the distance ln (n = 1 to 6) between each measurement point P1 to P6 and the non-displacement point P0 where the displacement meter 9 is installed is each measurement for the distance L0 from the face 1 to the non-displacement point P0. Since it is determined by the distances L1 to L6 from the face 1 of the points P1 to P6 and has a relationship of ln = L0−Ln (n = 1 to 6), the displacement meter 9 is not displaced via the displacement transmission members 8a to 8f. By detecting a change in the distance ln between the point P0 and the measurement points P1 to P6, the displacement of the ground 2 is measured for each of the measurement points P1 to P6.

  That is, when a displacement occurs in the ground 2 in front of the face 1, an axial force acts on the displacement transmitting members 8 a to 8 f accordingly, and the displacement of the ground is transmitted to the displacement meter 9.

  At that time, the displacement meter 9 is sufficiently separated from the face 1 and is installed at a position where the ground is not affected by excavation, that is, at the non-displacement point P0. The displacement of the ground 2 at each measurement location P1 to P6 can be automatically measured from the displacement ln.

  This displacement is detected by each detector of the displacement meter 9, and the amount of displacement is converted into an electrical signal. The electrical signal is automatically and periodically recorded by the recording means 11 such as the RF tags 5a to 5f and the data logger. The displacement data at each measurement location P1 to P6 is written and accumulated over time in the recording means 11 such as the RF tags 5a to 5f and the data logger.

  The displacement data recorded in each of the RF tags 5a to 5f is, as shown in FIG. 1, non-contact type from the RF tags 5a to 5f (RF tag 5a in FIG. 1) located near the face 1 after excavation. The data can be read out in real time by the data reader 6 and output to a monitor or the like (for example, FIG. 7), so that the operator can easily grasp the displacement state of the ground, and the information can be obtained after excavation work or excavation. It can be immediately reflected in the reinforcement work.

  Data read by the non-contact type data reader 6 can be identified from any of the RF tags 5a to 5f located in the vicinity of the face 1 by channel setting or the like of each of the RF tags 5a to 5f. It has become.

  If the information storage medium 5a closest to the face 1 cannot communicate due to a failure, the information storage medium 5b next to the face 1 and the non-contact data reader 6 perform non-contact short-range communication. Thus, the data may be read out.

  When the data is read by the non-contact data reader 6, as shown in FIG. 1, the face 1 after the reading unit 20 is dug using the remote control rod 22 fixed to the tip of the reading unit 20 is used. By approaching the information storage media 5a to 5f of the measurement anchor located in the vicinity, the operator can safely work in a state of maintaining a certain distance from the face 1 without entering an unstable face 1 after excavation. It is like that.

  Then, as shown in FIG. 6, as the digging progresses, the face 1 position shifts to the back side, and the measurement unit anchor 7 and the RF tag 5a arranged at the measurement point P1 on the near side by blasting or excavation with the excavator are moved together with earth and sand The displacement transmission member 8a and other cables are also removed by cutting, and the information storage medium located in the vicinity of the face 1 after excavation is moved to the RF tags 5b to 5f located on the back side of the RF tag 5a. Transition sequentially.

  Then, the data read by the non-contact type data reader 6 is performed by digging the ground 2 and, if necessary, displacement data from the RF tags 5a to 5f (RF tag 5b in FIG. 6) positioned appropriately near the face 1 as necessary. Is read by non-contact near field communication.

  Further, after digging to the vicinity of the casing 10, finally, the casing 10, that is, the recording means 11 such as the displacement meter 9 and the data logger is excavated from the ground 2 and collected.

  In this way, by storing the displacement data in the recording means 11 such as a data logger disposed in the innermost part of the test hole 3 in parallel with the recording on the RF tags 5a to 5f, the recording means 11 such as the data logger is stored. The collected data can be compared with the displacement data sequentially read from the RF tags 5a to 5f after collection, and even if the data cannot be read from any of the RF tags 5a to 5f, a recording means such as a data logger The information can be complemented by 11 stored data.

  In the ground displacement measuring device and the displacement measuring method configured in this way, even when excavation work is in progress, the displacement data of the ground in front of the face 2 is read from the RF tags 5a to 5f at any time by short-range non-contact communication. Therefore, this displacement data can be immediately reflected in excavation work and reinforcement work, and by performing appropriate excavation work and reinforcement, it becomes possible to control the deformation of the ground in front of the face and the existing excavation section.

  Moreover, since data reading from each RF tag 5a-5 is performed by short-range non-contact communication using the non-contact type data reader 6, there is no need for complicated work such as cable connection work under the face 1, Displacement measurement work can be performed safely and efficiently.

  Furthermore, by providing the non-contact type data reader 6 with the remote control rod 22, it is possible for the worker to work safely without entering the face 1.

  Note that the form of the RF tags 5a to 5f is not limited to the above-described embodiments. For example, the shape may be a card shape, a cylindrical shape, a coin shape, or the like, or directly from an internal battery or an external power source. A so-called active type or semi-active type that operates by receiving power supply may be used.

  In the above-described embodiment, the non-contact type data reader 6 includes the remote control rod 22 and the remote control rod 22 includes the read unit 20 including the antenna 20a at the tip. The formula data reader 6 may be a terminal in which the reading unit 20 and the reader body 21 are integrated.

  Further, in the above-described embodiment, the example in which the recording means 11 such as the data logger is installed in the innermost part of the test hole 3 has been described, but the recording means 11 may be omitted.

  Furthermore, in the above-described embodiment, the example in which the information recording medium such as the RF tags 5a to 5f is fixed to the measurement unit anchors 7, 7... Has been described, but the test hole 3 separate from the measurement points P1 to P6. You may make it install information storage media 5a-5f, such as RF tags 5a-5f, for every arbitrary position.

  In the above-described embodiment, an example in which the measurement locations P1 to P6 and the information storage media (RF tags 5a to 5f) are set to 6 locations has been described. However, the measurement locations and the information recording media are set to 6 locations. The number of installation locations is not limited to the number of locations, and the number of installation locations may be any, and the number of measurement locations and the number of installation locations of information storage media may be different.

  Further, in the above-described embodiment, the example applied to the tunnel excavation work by the mountain tunnel method or the like has been described, but the usage mode is not limited to this, for example, for the measurement of ground displacement in the construction of underground facilities other than the tunnel. Can also be applied.

DESCRIPTION OF SYMBOLS 1 Face 2 Ground 3 Pilot hole 4 Displacement measuring means 5a-5f RF tag (information storage medium)
6 Non-contact type data reader 7 Measuring unit anchors 8a to 8f Displacement transmission member 9 Displacement meter 10 Casing 11 Recording unit 12 Casing fixing unit 13 Anchor case 14 Widening operation unit 15 Memory unit 16 Control circuit unit 17 Antenna unit 18 Communication cable 20 Reading unit 21 Reading machine body 22 Remote operation rod

Claims (6)

In the ground displacement measuring device provided with a displacement measuring means for detecting the displacement of the ground for each of a plurality of measurement points in the test hole provided in the ground in front of the face, and converting the displacement amount into an electrical signal and outputting it,
A plurality of RFID information storage media for recording electrical signals output from the displacement measuring means as displacement data for each desired position in the test hole, and the RFID information storage media located near the face A ground displacement measuring device comprising a non-contact type data reader capable of reading out the displacement data by short - range non-contact communication.   The ground displacement measuring device according to claim 1, wherein each of the information storage media is installed for each measurement location.   The displacement measuring means is connected to a measurement unit anchor fixed to the ground at each measurement location, a plurality of displacement transmission members having one end fixed to each measurement unit anchor, and the other end of each displacement transmission member. And a displacement meter that detects the displacement of the ground at each measurement location via each displacement transmission member and converts the displacement amount into an electric signal, and the displacement meter is disposed at the innermost part of the test hole. The ground displacement measuring device according to claim 1 or 2.   The non-contact type data reader includes a reading unit having a reading antenna, a reader main body to which the reading unit is connected by wire, and a remote operation rod having the reading unit fixed to the tip. The ground displacement measuring device according to any one of claims 1 to 3. Drilling a borehole in the ground in front of the face, installing displacement measurement means in the borehole, detecting the displacement of the ground at each of the multiple measurement points in the borehole, and converting the displacement into an electrical signal In the ground displacement measurement method for measuring the ground displacement in front of the face due to excavation,
Previously installed information storage medium for RFID which stores the electric signal output from the displacement measuring means for each desired position of the drilling hole as the displacement data, the for RFID located working face near the rear excavation A displacement measurement method for ground, wherein displacement data recorded in an information storage medium is read out by short - range non-contact communication with a non-contact type data reader.   The non-contact type data reader includes a reading unit having a reading antenna, a reader main body to which the reading unit is connected by wire, and a remote operation rod having the reading unit fixed to the tip, The ground displacement measuring method according to claim 5, wherein the reading unit is brought closer to the information storage medium located in the vicinity of the face after excavation using an operation rod.

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