JP6590191B2 - Method and apparatus for measuring characteristics of rock around tunnel - Google Patents

Description

  The present invention relates to a method and an apparatus for measuring characteristics of a rock around a mine, and in particular, measuring a property of a rock around a mine that measures the humidity and the like of a rock around a mine in a deep underground pit where radioactive waste is sealed and disposed. The present invention relates to a characteristic measuring method and apparatus.

  Conventionally, in geological disposal of radioactive waste, as shown in FIG. 5, after excavating a mine 1 in a deep underground, and placing a waste body 3 in which radioactive waste is sealed in a disposal hole 2 of the mine 1, a mine 1 Is considered to be closed and disposed of.

  During the construction of such underground facilities and the operation of placing wastes, the rock around the tunnel is likely to be in a dry state due to air circulation by ventilation or the like. Whether or not to be in a dry state depends on the water permeability characteristics of the rock, the hydraulic gradient, and the temperature and humidity environment in the excavation tunnel. Although it may be possible to return to saturation in the long term by lining construction, etc., it is actually good to know what temperature and humidity environment conditions will not cause any problem in how long it is open. I don't know. In particular, in sedimentary rocks widely distributed in Japan, as shown in FIG. 6, cracking due to drying, volume shrinkage, etc. are conspicuous, and it is thought that the change area of strength and permeability of the rock mass expands accordingly A method for evaluating the extent and scope has not been established.

  Since the rock area near the tunnel can be a groundwater transfer route from the construction of the geological disposal facility to after it is closed, the evaluation of its physical properties is an important factor that can be reflected in both the geological disposal facility design and safety assessment. . Therefore, for the purpose of developing an investigation and evaluation method for the influence of drying on the rock near the tunnel when installing underground facilities in sedimentary rocks, research on the mechanism of deformation behavior accompanying drying of the rock and its modeling has been conducted. It is being advanced. When considering the effect of drying on the rock near the tunnel, it is necessary to understand the drying phenomenon in the rock around the actual tunnel. At that time, it is necessary to grasp the humidity state not only in the wall surface of the tunnel but also in the bedrock.

  As a method of grasping the humidity state inside the rock mass, there is a method in which a boring hole for humidity measurement is drilled from the wall surface of the tunnel toward the inside of the rock mass, and a humidity measuring instrument is inserted here to measure the humidity inside the rock mass. . However, from the viewpoint of cost reduction, it is desirable to be able to measure the humidity inside the rock without providing a borehole for humidity measurement.

  Therefore, it is conceivable to measure the humidity inside the rock using a rock bolt hole, which is a kind of shaft support. In general, a fixing bolt as shown in FIG. 7 is often used as a lock bolt used for a shaft support. As shown in this figure, the fixing material type rock bolt is such that the fixing material 2 made of mortar or the like is filled into the placement hole 3 and the core material 4 such as a steel bar is inserted to fix the entire length of the core material 4 to the bedrock G. It is something to be made. In this case, the placement hole 3 is backfilled with the fixing material 2 and the core material 4, and it is difficult to provide a space for installing the humidity measuring device.

  On the other hand, a frictional lock bolt as shown in FIG. 8 may be used. As shown in this figure, the friction-type lock bolt is fixed by the frictional force obtained by bringing the core material 4 into close contact with the wall surface of the placement hole 3 by expanding the core material 4 in the placement hole 3 or the like. It is something to be made. A typical example is a steel pipe expansion lock bolt as shown in FIG. 9 (see Non-Patent Document 1). As shown in this figure, the steel pipe expansion type lock bolt 5 includes a deformed steel pipe 6 having a concave-shaped cross section, and sleeves 7 for sealing and water injection that are attached to both ends of the deformed steel pipe 6. The deformed steel pipe 6 has a cross-sectional shape in which a circular steel pipe is recessed and folded.

Takefumi Nakako, Takeyuki Yoshida, Shigeo Matsubara, Mitsuru Nishihata, “Development of high durability steel pipe expansion type rock bolt system and application to tunnel”, Nisshin Steel Engineering Reports No. 92, 2011

  The present invention has been made in view of the above, and the characteristics of the rocks around the mine that can measure the characteristics such as humidity inside the rock using a rock bolt driving hole which is a kind of mine support work. An object is to provide a measurement method and apparatus.

  In order to solve the above-mentioned problems and achieve the object, the method for measuring the characteristics of the rocks around the tunnel according to the present invention is a method for measuring the characteristics of the rocks around the tunnel using a measurement sensor, and is provided in the surrounding rocks. A space in which the measurement sensor can be installed along the longitudinal direction of the lock bolt is formed between the step of inserting the frictional lock bolt into the placement hole and the lock bolt and the wall surface of the placement hole. The step of closely attaching the lock bolt to the wall surface of the placement hole except for a part in the circumferential direction of the lock bolt, and inserting and arranging the measurement sensor at a predetermined position in the space And a step of measuring the characteristics.

  In another aspect of the invention, the measurement sensor is a humidity sensor that measures the humidity of the rock around the mine shaft.

  In another aspect of the present invention, the frictional rock bolt is a steel pipe expansion type rock bolt, and the placement method is performed by superposing at least two of the rock bolts. After inserting into the hole, high pressure water is injected, and the lock bolt is formed so that a part where the lock bolts are in contact with each other, a part where the lock bolts are in close contact with the wall surface of the placement hole, and the space are formed. It is inflated.

  In addition, in the above-described invention, the method for measuring characteristics of rocks around the mine shaft according to the present invention is connected to the measurement sensor, and a wire extending from the mouth side of the lock bolt is attached to the head of the lock bolt. Extending the lock bolt to the mouth side of the lock bolt via a pulley, expanding the lock bolt, and then pulling the wire arranged in the space toward the front side, thereby extending the measurement sensor in the longitudinal direction of the lock bolt. It is characterized by moving in the direction.

  Further, the device for measuring the characteristics of a rock around a mine shaft according to the present invention is a device for measuring the properties of the rock around the mine shaft using a measurement sensor, and is a friction type rock bolt inserted into a placement hole provided in the surrounding rock. And the lock bolt is closely attached to the wall surface of the placement hole except for a part in the circumferential direction of the lock bolt, so that the length of the lock bolt is between the lock bolt and the wall surface of the placement hole. It is characterized by comprising a space formed along the direction, and a measurement sensor installed in the space for measuring the characteristics of the surrounding rock mass.

  In another aspect of the invention, the measurement sensor for a property of a rock around the mine shaft according to the present invention is characterized in that the measurement sensor is a humidity sensor that measures the humidity of the rock around the mine shaft.

  Further, in the above-described invention, the frictional rock bolt is a steel pipe expansion type rock bolt, and the placing device is formed by overlapping at least two of the rock bolts. After inserting into the hole, high pressure water is injected, and the lock bolt is formed so that a part where the lock bolts are in contact with each other, a part where the lock bolts are in close contact with the wall surface of the placement hole, and the space are formed. It is inflated.

  In addition, in the above-described invention, the device for measuring characteristics of a rock around a mine shaft according to the present invention is connected to the measurement sensor, extends from the mouth side of the lock bolt, passes through the space, and the head of the lock bolt. A wire extended to the mouth side of the lock bolt via a pulley attached to the lock bolt, and pulling the wire toward the front side to enable the measurement sensor to move in the longitudinal direction of the lock bolt. Features.

  According to the method for measuring characteristics of a rock around a mine shaft according to the present invention, a method for measuring the characteristics of the rock around the mine shaft using a measurement sensor, the friction-type rock bolt is inserted into a placement hole provided in the surrounding rock. A circumferential direction of the lock bolt so that a space in which the measurement sensor can be installed along the longitudinal direction of the lock bolt is formed between the process and the wall surface of the drive hole. Including the step of closely attaching the lock bolt to the wall surface of the placement hole except for the portion, and the step of measuring the characteristics of the surrounding rock mass by inserting and arranging the measurement sensor at a predetermined position in the space. The effect of being able to measure characteristics such as humidity inside the rock mass using a rock bolt driving hole which is a kind of support work.

  In addition, according to the method for measuring characteristics of other rocks around a mine shaft according to the present invention, the measurement sensor is a humidity sensor that measures the humidity of rocks around the mine shaft. There is an effect that the humidity of the rock can be measured.

  Further, according to the method for measuring characteristics of other rocks around a mine shaft according to the present invention, the frictional rock bolt is a steel pipe expansion type rock bolt, and at least two of the rock bolts are overlapped and inserted into the placement hole. After that, the high pressure water is injected, and the lock bolt is inflated so that a portion where the lock bolts are in contact with each other, a portion where each is in close contact with the wall surface of the placement hole, and the space are formed. There is an effect that the measurement sensor can be inserted and disposed in a space formed by expansion of at least two steel pipe expansion type lock bolts.

  Further, according to another method for measuring characteristics of rocks around a mine shaft according to the present invention, a wire connected to the measurement sensor and extending from the mouth side of the lock bolt is connected via a pulley attached to the head of the lock bolt. Then, after extending the lock bolt and expanding the lock bolt, the measurement sensor is moved in the longitudinal direction of the lock bolt by pulling the wire arranged in the space to the near side. Therefore, it is possible to move and fix the measurement sensor to a desired position in the longitudinal direction of the lock bolt, and it is possible to measure characteristics such as humidity at the position.

  Further, according to the property measuring device for rocks around the tunnel according to the present invention, it is a device for measuring the properties of the rock around the tunnel using a measurement sensor, and is a friction type inserted into a placement hole provided in the surrounding rock The lock bolt and the lock bolt are disposed between the lock bolt and the wall surface of the placement hole by bringing the lock bolt into close contact with the wall surface of the placement hole except for a part in the circumferential direction of the lock bolt. It is equipped with a space formed along the longitudinal direction and a measurement sensor installed in the space for measuring the characteristics of the surrounding rock mass. Thus, it is possible to measure characteristics such as humidity inside the bedrock.

  Further, according to the property measuring device of another rock around the mine shaft according to the present invention, the measurement sensor is a humidity sensor that measures the humidity of the rock around the mine shaft. There is an effect that the humidity of the rock can be measured.

  Further, according to the property measuring apparatus for rocks around the mine shaft according to the present invention, the frictional rock bolt is a steel pipe expansion type rock bolt, and at least two of the rock bolts are overlapped and inserted into the placement hole. After that, the high pressure water was injected, and the lock bolt was expanded so as to form a portion where the lock bolts contact each other, a portion where the lock bolts are in close contact with the wall surface of the placement hole, and the space. Therefore, there is an effect that the measurement sensor can be inserted and arranged in a space formed by expansion of at least two steel pipe expansion type lock bolts.

  Further, according to the other property measuring apparatus for rocks around the mine shaft according to the present invention, it is connected to the measurement sensor, extends from the mouth side of the lock bolt, and is attached to the head of the lock bolt through the space. Since it has a wire extended and arranged on the mouth side of the lock bolt via a pulley, the measurement sensor can be moved in the longitudinal direction of the lock bolt by pulling the wire to the near side. It is possible to move and fix the lock bolt to a desired position in the longitudinal direction, and it is possible to measure characteristics such as humidity at the position.

FIG. 1 is a flowchart showing an embodiment of a method and apparatus for measuring characteristics of a rock around a tunnel according to the present invention. FIG. 2 is a cross-sectional view of an installation situation of a steel pipe expansion type rock bolt showing an embodiment of a method and apparatus for measuring the characteristics of rocks around a mine shaft according to the present invention, (1) before expansion and (2) after expansion. FIG. FIGS. 3A and 3B are diagrams showing an example of a humidity sensor moving mechanism, in which FIG. 3A is a cross-sectional view and FIG. 3B is a cross-sectional view taken along line AA of FIG. FIGS. 4A and 4B are diagrams showing an example of the arrangement of the property measuring apparatus for rocks around a mine shaft according to the present invention. FIG. 4A shows the case of arrangement 1 and FIG. FIG. 5 is a schematic diagram of conventional geological disposal of radioactive waste. FIG. 6 is a conceptual diagram of the drying effect in the vicinity of a conventional mine shaft. FIG. 7 is a perspective sectional view of a conventional fixing material type rock bolt. FIGS. 8A and 8B are views of a conventional friction lock bolt, wherein FIG. 8A is a perspective view before expansion, FIG. 8B is a cross-sectional view taken along line AA of FIG. 4) is a sectional view taken along line BB in (3). FIG. 9 is a view of a conventional steel pipe expansion type lock bolt, (1) is a schematic view of a support structure of the NATM method, (2) is a perspective view before expansion, and (3) is an AA of (2). Sectional drawing, (4) is a BB sectional view of (2), (5) is a perspective view after expansion, and (6) is a CC sectional view of (5).

  DESCRIPTION OF EMBODIMENTS Embodiments of a method and an apparatus for measuring characteristics of a rock around a mine shaft according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Characteristic measurement method of rock mass around tunnel)
First, a method for measuring characteristics of a rock around a mine shaft according to the present invention will be described.
As shown in FIG. 1, the method for measuring the characteristics of a rock around the mine according to the present invention is a method for measuring the humidity (characteristic) of the rock around the mine using a humidity sensor (measurement sensor). A humidity sensor can be installed along the longitudinal direction of the lock bolt between the step S1 in which the steel pipe expansion type lock bolt (friction type lock bolt) is inserted and installed in the cast hole and the wall surface of the lock bolt and the cast hole. Step S2 in which the lock bolt is closely attached to the wall surface of the placement hole except for a part of the lock bolt in the circumferential direction so that a space is formed, and a humidity sensor is inserted and arranged at a predetermined position in the space. Step S3 for measuring the humidity of

  FIG. 2 is a cross-sectional view showing an installation state of the steel pipe expansion type lock bolt used in the present embodiment, where (1) shows before the lock bolt is expanded and (2) shows after the expansion. First, in the above-described step S1, as shown in FIG. 2 (1), two steel pipe expansion type rock bolts 10 made of deformed steel pipes having a substantially concave cross section are overlapped on the surrounding rock mass G in a back-facing state. It inserts in the provided casting hole 12. In addition, sleeves (not shown) for sealing and water injection are attached to both ends of the two steel pipe expansion type lock bolts 10. In the subsequent step S2, high-pressure water is injected into the lock bolt 10 to expand the lock bolt 10. Here, as shown in FIG. 2 (2), a portion 14 where the two lock bolts 10 contact each other, a portion 18 where each of the lock bolts 10 is in close contact with the wall surface 16 of the placement hole 12, and the entire length of the lock bolt 10. The two lock bolts 10 are expanded into a substantially D-shaped cross section so that a substantially fan-shaped space 20 having a predetermined dimension is formed.

  In this embodiment, two steel pipe expansion type lock bolts 10 are basically stacked and inserted. However, when there is a possibility that a substantially fan-shaped space 20 having a predetermined dimension cannot be formed, It is desirable to carry out processing such as adjusting the expansion shape, such as joining them by welding or the like in advance. Since the two steel pipe expansion-type lock bolts 10 are in close contact with the wall surface 16 of the placement hole 12, fixing to the rock mass G by a frictional force is ensured, and a supporting effect is obtained instantaneously.

  Next, in the above step S3, a humidity sensor is inserted into the substantially fan-shaped space 20 formed by the expansion of the rock bolt 10 and fixed at a predetermined position, and the humidity of the surrounding rock G is measured. As the humidity sensor, for example, a humidity sensor such as a ceramic sensor used in the concrete field can be used.

  Here, the humidity sensor may be configured to be movable in the longitudinal direction of the lock bolt. For example, as shown in FIG. 3, a wire 24 extending from the mouth side 22 of the lock bolt 10 is passed through the upper space 20 a, and the wire 24 is placed on the lower side via a pulley 28 attached to a head 26 of the lock bolt 10. Is extended to the mouth side 22 of the lock bolt 10 through the space 20b. Moreover, the wire 24 and the humidity sensor 30 are connected. The wire 24 is arranged in a substantially fan-shaped space 20 (see FIG. 2) formed by the expansion of the lock bolt 10. After the expansion of the lock bolt 10, the humidity sensor 30 is moved in the longitudinal direction of the lock bolt 10 (see FIG. 3) by pushing and pulling the wire 24 inserted and disposed in the substantially fan-shaped space 20 from the mouth side 22 of the lock bolt 10. Left and right direction). If the wire 24 is fixed at a desired position, the humidity sensor 30 can be moved and fixed to a desired position in the longitudinal direction of the lock bolt 10, and characteristics such as humidity at that position can be measured. it can.

  In addition, about the humidity measurement position of the surrounding rock mass of a mine shaft, as shown in FIG. 4 (1), all the rock bolts of the rock bolt placement section of the mine shaft 32 are made into the steel pipe expansion type rock bolt 10, and humidity is put in each placement hole. A method of measuring the humidity by arranging a sensor, and as shown in FIG. 4 (2), several of the total lock bolts are steel tube expansion type lock bolts 10, and the rest are normal fixing material type lock bolts 34, and a method of measuring the humidity by arranging a humidity sensor in the placement hole of the steel pipe expansion type rock bolt 10 is conceivable.

  Thus, according to the present embodiment, by using a steel pipe expansion type rock bolt driving hole which is a kind of mine support work, without providing a dedicated boring hole for humidity measurement, Humidity measurement is possible. Moreover, humidity measurement is possible in a state where the support effect by the lock bolt is maintained.

  Furthermore, according to this Embodiment, collapse of the hole wall of a lock bolt placement hole is prevented by steel pipe expansion, and the installation space of a humidity sensor can be ensured. This eliminates the need for installing a hole wall protection work such as a casing, and allows the humidity state of the rock mass on the hole wall surface to be directly measured. Moreover, since the humidity sensor can be moved to an arbitrary position along the rock bolt, it is possible to obtain the humidity distribution in the depth direction in the rock mass with one sensor.

(Characteristic measuring device of rock around tunnel)
Next, the property measuring apparatus for rocks around a mine shaft according to the present invention will be described.

  The property measuring apparatus 100 for a mine-periphery rock according to the present invention is an apparatus of the method for measuring a property of a mine-periphery rock according to the above-described embodiment. As shown in FIGS. The lock bolt 10 is brought into close contact with the wall surface 16 of the placement hole 12 except for a steel pipe expansion type lock bolt 10 (friction type lock bolt) to be inserted into the provided placement hole 12 and a part of the lock bolt 10 in the circumferential direction. Thus, the space 20 formed along the longitudinal direction of the rock bolt 10 between the rock bolt 10 and the wall surface 16 of the placement hole 12, and the humidity (characteristic) of the surrounding rock mass G are installed in the space 20. A humidity sensor 30 (measurement sensor) for measurement is provided. It is good also as a structure provided with the wire 24 for moving and fixing the humidity sensor 30 to the desired position of the lock bolt 10 in the longitudinal direction.

  According to the property measuring apparatus 100 for a tunnel periphery rock according to the present embodiment, the same effects as those described in the method for measuring a property of a tunnel periphery rock according to the present invention can be obtained. That is, by using a steel pipe expansion type rock bolt driving hole, which is a kind of mine support, it is possible to measure the humidity inside the rock mass without providing a dedicated boring hole for humidity measurement. Moreover, humidity measurement is possible in a state where the support effect by the lock bolt is maintained.

  In addition, the expansion of the steel pipe prevents the wall of the lock bolt placement hole from collapsing, and the installation space for the humidity sensor can be secured. This eliminates the need for installing a hole wall protection work such as a casing, and allows the humidity state of the rock mass on the hole wall surface to be directly measured. Moreover, since the humidity sensor can be moved to an arbitrary position along the rock bolt, it is possible to obtain the humidity distribution in the depth direction in the rock mass with one sensor.

  In the above embodiment, the humidity sensor that measures the humidity in the surrounding rock mass has been described as an example. However, the present invention is not limited to this, and any device that measures the characteristics of the surrounding rock mass can be used. A measurement sensor may be used. For example, a temperature sensor that measures the temperature in the surrounding rock mass may be used.

  In the above embodiment, the case where two steel pipe expansion type lock bolts are used has been described as an example. However, the present invention is not limited to this, and between the steel pipe expansion type lock bolt and the wall surface of the placement hole. In addition, one steel pipe expansion type lock bolt may be used or three or more may be used as long as a space in which the humidity sensor can be installed can be formed.

  As described above, according to the method for measuring the characteristics of the rocks around the tunnel according to the present invention, the method for measuring the characteristics of the rocks around the tunnel using the measurement sensor, the friction in the placement hole provided in the surrounding rocks The lock bolt so that a space in which the measurement sensor can be installed is formed along the longitudinal direction of the lock bolt between the lock bolt and the wall surface of the placement hole. A step of closely attaching the lock bolt to the wall surface of the placement hole except for a part in a circumferential direction of the bolt, a step of measuring the characteristics of the surrounding rock mass by inserting and arranging the measurement sensor at a predetermined position in the space; Therefore, it is possible to measure characteristics such as humidity inside the rock mass using a rock bolt driving hole which is a kind of mine support work.

  In addition, according to the method for measuring characteristics of other rocks around a mine shaft according to the present invention, the measurement sensor is a humidity sensor that measures the humidity of rocks around the mine shaft. The humidity of the rock can be measured.

  Further, according to the method for measuring characteristics of other rocks around a mine shaft according to the present invention, the frictional rock bolt is a steel pipe expansion type rock bolt, and at least two of the rock bolts are overlapped and inserted into the placement hole. After that, the high pressure water is injected, and the lock bolt is inflated so that a portion where the lock bolts are in contact with each other, a portion where each is in close contact with the wall surface of the placement hole, and the space are formed. A measurement sensor can be inserted and disposed in a space formed by expansion of at least two steel pipe expansion type lock bolts.

  Further, according to another method for measuring characteristics of rocks around a mine shaft according to the present invention, a wire connected to the measurement sensor and extending from the mouth side of the lock bolt is connected via a pulley attached to the head of the lock bolt. Then, after extending the lock bolt and expanding the lock bolt, the measurement sensor is moved in the longitudinal direction of the lock bolt by pulling the wire arranged in the space to the near side. Therefore, the measurement sensor can be moved and fixed to a desired position in the longitudinal direction of the lock bolt, and characteristics such as humidity at the position can be measured.

  Further, according to the property measuring device for rocks around the tunnel according to the present invention, it is a device for measuring the properties of the rock around the tunnel using a measurement sensor, and is a friction type inserted into a placement hole provided in the surrounding rock The lock bolt and the lock bolt are disposed between the lock bolt and the wall surface of the placement hole by bringing the lock bolt into close contact with the wall surface of the placement hole except for a part in the circumferential direction of the lock bolt. It is equipped with a space formed along the longitudinal direction and a measurement sensor installed in the space for measuring the characteristics of the surrounding rock mass. Thus, it is possible to measure characteristics such as humidity inside the bedrock.

  Further, according to the property measuring device of another rock around the mine shaft according to the present invention, the measurement sensor is a humidity sensor that measures the humidity of the rock around the mine shaft. The humidity of the rock can be measured.

  Further, according to the property measuring apparatus for rocks around the mine shaft according to the present invention, the frictional rock bolt is a steel pipe expansion type rock bolt, and at least two of the rock bolts are overlapped and inserted into the placement hole. After that, the high pressure water was injected, and the lock bolt was expanded so as to form a portion where the lock bolts contact each other, a portion where the lock bolts are in close contact with the wall surface of the placement hole, and the space. Therefore, a measurement sensor can be inserted and disposed in a space formed by expansion of at least two steel pipe expansion type lock bolts.

  Further, according to the other property measuring apparatus for rocks around the mine shaft according to the present invention, it is connected to the measurement sensor, extends from the mouth side of the lock bolt, and is attached to the head of the lock bolt through the space. Since it has a wire extended and arranged on the mouth side of the lock bolt via a pulley, the measurement sensor can be moved in the longitudinal direction of the lock bolt by pulling the wire to the near side. The lock bolt can be moved and fixed to a desired position in the longitudinal direction, and characteristics such as humidity at the position can be measured.

  As described above, the method and apparatus for measuring the characteristics of rocks around the mine according to the present invention measure the characteristics such as the humidity of the rocks around the mine in the deep underground pit where the wastes sealed with radioactive waste are placed and disposed. In particular, it is suitable for measuring characteristics such as humidity inside the rock mass using a rock bolt driving hole which is a kind of shaft support work.

10 Steel pipe expansion type lock bolt (friction type lock bolt)
12 Punching hole 14, 18 part 16 Wall surface 20, 20a, 20b Space 22 Mouth side 24 Wire 26 Head 28 Pulley 30 Humidity sensor (measuring sensor)
32 Tunnel 34 Fixing material type rock bolt 100 Property measuring device of rock around the tunnel G Rock around the tunnel

Claims (6)

It is a method of measuring the characteristics of the rock around the tunnel using a measurement sensor,
Inserting a friction lock bolt, which is a steel pipe expansion type lock bolt, into a placement hole provided in the surrounding rock,
A space around the friction lock bolt is formed so that a space in which the measurement sensor can be installed is formed along the longitudinal direction of the friction lock bolt between the friction lock bolt and the wall surface of the placement hole. Adhering the friction lock bolt to the wall surface of the placement hole except for a part of the direction;
Look including the step of measuring the characteristics of the surrounding rock of the measuring sensor inserted and placed to a predetermined position of the space,
After at least two friction lock bolts are overlapped and inserted into the placement hole, high-pressure water is injected, and the friction lock bolts are in contact with each other, and each is placed on the wall surface of the placement hole. A method for measuring characteristics of a rock around a mine shaft, wherein the frictional rock bolt is expanded so as to form a close contact portion and the space .   The method for measuring characteristics of a rock around a mine shaft according to claim 1, wherein the measurement sensor is a humidity sensor that measures the humidity of the rock around the mine shaft. Ligating the measuring sensor, the wires extending from the mouth portion side of the friction lock bolt, extending located near the mouth portion side of the friction locking bolt head on the mounting pulleys the friction locking bolt through the, 2. After the friction lock bolt is expanded, the measurement sensor is moved in the longitudinal direction of the friction lock bolt by pulling the wire disposed in the space toward the front side. Or the characteristic measuring method of the rock surrounding a mine according to 2. A device that measures the characteristics of rock around the mine using a measurement sensor,
Friction type rock bolt that is a steel pipe expansion type rock bolt to be inserted into a placement hole provided in the surrounding rock,
By bringing the friction lock bolt into close contact with the wall surface of the placement hole except for a part of the friction lock bolt in the circumferential direction, the friction lock bolt and the wall surface of the placement hole, A space formed along the longitudinal direction of the friction lock bolt;
With a measurement sensor installed in the space for measuring the characteristics of the surrounding rock ,
After at least two friction lock bolts are overlapped and inserted into the placement hole, high-pressure water is injected, and the friction lock bolts are in contact with each other, and each is placed on the wall surface of the placement hole. An apparatus for measuring characteristics of a rock around a mine shaft, characterized in that the frictional rock bolt is expanded so as to form a close contact portion and the space . 5. The property measuring apparatus for rocks around a tunnel according to claim 4 , wherein the measurement sensor is a humidity sensor that measures the humidity of rocks around the tunnel. Ligating the measuring sensor, extending from the mouth portion side of the friction locking bolt, extending the mouth portion side of the friction locking bolt via a pulley attached to the head of the friction locking bolt through the space With wires arranged,
6. The property measuring apparatus for rocks around a tunnel according to claim 4 or 5 , wherein the measuring sensor is movable in a longitudinal direction of the frictional rock bolt by pulling the wire toward the front side.

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