JP2016130811A - Geological survey method in front of tunnel working face and industrial endoscope apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To survey even a natural ground of which pore wall is prone to collapse, directly acquire a situation of the natural ground, and perform survey by simple work.SOLUTION: The geological survey method in front of a tunnel working face, includes: in a process where a natural ground in front of a working face S is drilled by a drill jumbo 2 that includes a drifter 2a moving forward/backward freely, on a guide cell 2b, and a drilling machine mounted thereon for performing drilling by a rod 3 having a drilling bit 4 at a tip end, when the drill jumbo reaches a geological survey site, temporarily stopping the drilling; retreating the rod 3 along with the drifter 2a by a prescribed distance to separate the drifter 2a from the rod 3; sending an endoscope insertion section 6 of an industrial endoscope apparatus 1 from a base end side of the rod 3 through a drilling water feed passage 3a; causing a distal end to project from a drilling water discharge hole 5 of the drilling bit 4 to the outside; and surveying a situation of the natural ground in front of the drilling bit 4 by the endoscope insertion section 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a geological exploration method and an industrial endoscope apparatus for exploring the geology in front of a face of a tunnel in order to avoid face collapse during tunnel excavation and contribute to safe and economical excavation.

  Conventionally, grasping the geology ahead of the face such as a mountain tunnel has been a very important technique for avoiding face collapse and performing safe and economical excavation, and the demand from the site is very high. It was a challenge.

  As a method of exploring the geology in front of the tunnel face, a method of observing the geology by inserting a probe equipped with a small camera at the tip into the borehole (for example, Patent Document 1 below), drilling when drilling A method using a borehole logging system that estimates the quality of geology based on drilling data such as velocity and drilling energy (for example, Patent Document 2 below), an elastic wave generated by an artificial seismic source, and a geological boundary surface There is an elastic wave exploration method that receives a reflected wave from the surface and makes a determination based on the received data.

  In the following Patent Document 1, a geological structure in which a borehole camera is inserted into a transparent tube member laid in a drilling hole formed using a drilling machine in front of a tunnel face, and the state of a natural ground is photographed through the tube member. An exploration method is disclosed.

  Moreover, in the following Patent Document 2, as a method for predicting the geology of the ground in front of the face in tunnel excavation work, the thrust of the drilling rod of the rock drill, the water pressure of the drilling water from the tip of the drilling bit, and the rotational torque A method of discriminating the geology of a natural ground is disclosed using a value obtained by dividing the impact pressure and the drilling depth / velocity by the volume of the rock drilled per unit time of the rock drill.

JP 2012-12879 A Japanese Patent Laid-Open No. 10-252051

  However, the method of observing the geology by inserting a small camera into the borehole described above has the advantage of being able to directly grasp the condition of the natural ground, but the independence of the hole wall is poor, the bedrock is poor and the skin is rough Since the probe could not be inserted in cases such as when this was conspicuous, the nature of the exploration ground was limited.

  On the other hand, in the method described in Patent Document 1, a transparent pipe member is laid in the drilling hole, a borehole camera is inserted into the pipe member laid in the drilling hole, and the state of the ground is photographed through the pipe member. Therefore, it is possible to apply to a soft ground where the pit wall does not stand on its own. However, when laying the pipe member in the drilling hole, the surface of the pipe member is damaged, and mud adheres to the outer surface of the transparent pipe member, so the pipe member becomes an obstacle and grasps the exact condition of the natural ground. There was a problem that was difficult to do.

  Further, in the method described in Patent Document 1, a hole drilling machine is composed of an outer pipe member including a transparent pipe member and a hole drilling member used by being inserted into the outer pipe member. In order to insert the borehole camera into the transparent tube member, it takes time and effort to draw out the hole-drilling member from the outer tube member, and the time and cost for laying the outer tube member are excessive.

  On the other hand, since the borehole logging system predicts geology based on the drilling energy during drilling, only indirect information can be obtained, and cracks and fractures in the natural ground can be accurately identified. There was a problem that could not be grasped. Further, the elastic wave exploration method similarly has a problem that only indirect information on the natural ground can be obtained, and the state of the natural ground cannot be accurately grasped.

  Therefore, the main problem of the present invention is that geological exploration in front of the face of the tunnel, which enables exploration even in a natural mountain where the hole wall is easy to collapse, and enables the direct understanding of the state of the natural mountain and exploration by simple work. It is to provide a method and an industrial endoscope apparatus.

  In order to solve the above-mentioned problem, the present invention according to claim 1 is equipped with a drilling machine for drilling by a rod provided with a drifter on a guide cell so as to be able to move forward and backward and having a drilling bit at the tip. In the process of drilling a natural ground in front of the face with a drill jumbo while adding one or more rods, if the geological exploration site is reached, the drilling is temporarily interrupted and the rod with the drifter for a predetermined distance And the state where the drifter is separated from the rod, the endoscope insertion portion of the industrial endoscope apparatus is fed from the proximal end side of the rod through the drilling water supply path, and the tip is the drilling bit. A geological exploration method in front of the face of the tunnel is provided, wherein the state of the ground in front of the drill bit is investigated by the endoscope insertion portion. .

  According to the first aspect of the present invention, in the process of drilling the ground in front of the face with a drill jumbo, if the geological exploration site is reached, the drilling is temporarily interrupted and the rod is used as a casing instead of the drilling hole. This is a method for conducting geological exploration by inserting an endoscope insertion portion of an industrial endoscope apparatus. Specifically, the hole drilling is temporarily interrupted, the rod is retracted together with the drifter by a predetermined distance, and the drifter is separated from the rod, and the inside is viewed from the base end side of the rod through the hole drilling water supply path. The mirror insertion part is fed in, the tip is protruded to the outside from the drilling water discharge hole of the drilling bit, and the state of the natural ground ahead of the drilling bit is searched by the endoscope insertion part.

  For this reason, in this geological exploration method, even in a natural mountain where the hole wall is likely to collapse, the endoscope insertion portion can be inserted into the drilling hole instead of the casing, and the exploration by the endoscope insertion portion becomes possible. In addition, since the tip of the endoscope insertion part protrudes outside from the drilling water discharge hole of the drilling bit, the state of the natural ground can be directly investigated in the search by the endoscope insertion part. become. Furthermore, as geological exploration work, since the borehole is temporarily interrupted, the endoscope insertion part is simply fed from the base end side of the rod through the borehole water supply path, so geological exploration can be performed with simple work. It becomes like this.

  According to a second aspect of the present invention, there is provided a geological exploration method in front of a tunnel face according to the first aspect, wherein a fiberscope is used as the industrial endoscope apparatus.

  In the second aspect of the invention, when a fiberscope is used as the industrial endoscope apparatus, the rod and the drill bit have not only a straight line but also a curved portion bent in the middle. However, the fiberscope can flexibly change its direction and pass through the curved portion, and can be inserted to a position where the tip of the endoscope insertion portion protrudes outside from the drilling water discharge hole of the drilling bit.

  As the present invention according to claim 3, when drilling with the drill jumbo, a drilling logging system for predicting geology from drilling data was applied, and the drilling logging system reached near the boundary where the geology changes. The geological exploration method in front of the face of the tunnel according to any one of claims 1 and 2, wherein the state of the natural ground is explored by the endoscope insertion portion.

  According to the third aspect of the present invention, a drilling logging system for predicting geology based on drilling data such as drilling speed and drilling energy when drilling with the drill jumbo is applied. When it is predicted from the result of the system that the vicinity of the boundary where the geology changes is reached, the state of the natural ground is searched by the endoscope insertion part. In this way, by using a drilling logging system together with geological exploration, it is possible to indirectly grasp the geological situation based on this drilling logging system and Detailed situation can be observed directly.

  As a fourth aspect of the present invention, the rod and the drill bit are pulled out by a traction tool in a state where the distal end of the endoscope insertion portion protrudes outside from the drill water discharge hole of the drill bit. The front face of the tunnel according to any one of claims 1 to 3, wherein the state of the natural ground in the drilling hole is continuously explored in the axial direction by pulling out the endoscope insertion portion while synchronizing. Geological exploration methods are provided.

  In the invention according to claim 4, the rod and the drill bit are pulled out by an indexing instrument in a state where the distal end of the endoscope insertion portion protrudes outward from the drill water discharge hole of the drill bit. In addition, since the state of the natural ground in the drilling hole is continuously explored in the axial direction by pulling out the endoscope insertion portion in synchronization, in the case of a collapsing hole wall or the like, Can be continuously explored over a wide area.

Industrial use for exploring geology in a drilling hole drilled by a drill jumbo equipped with a drilling machine for drilling with a rod having a drilling bit at the tip as the present invention according to claim 5 An endoscopic device,
The industrial endoscope apparatus includes an endoscope insertion portion that can be inserted into the drilling water supply path of the rod and the drilling water discharge hole of the drilling bit,
The endoscope insertion portion includes a distal end portion on which a camera is mounted and an electric wire extending rearward from the distal end portion, and a pushing force when the endoscope insertion portion is fed from the proximal end side of the rod. Provided is an industrial endoscope apparatus characterized in that reinforcing means for facilitating transmission is provided.

  According to the fifth aspect of the present invention, the endoscope insertion portion is fed from the base end side of the rod in order to facilitate feeding the endoscope insertion portion of the industrial endoscope apparatus into the rod or the drill bit. Reinforcing means for facilitating transmission of the pushing force at the time is provided.

  According to a sixth aspect of the present invention, the endoscope insertion portion includes a structure in which a fiber rod is juxtaposed with the electric wire and the electric wire and the fiber rod are integrally covered with a blade tube as the reinforcing means. An industrial endoscope apparatus according to claim 5 is provided.

  In the invention described in claim 6, as the reinforcing means, a fiber rod is juxtaposed with the electric wire, and the electric wire and the fiber rod are integrally covered with a blade tube, so that a fiber having a linear and high bending rigidity is provided. It is easy to transmit the pushing force when pushing the endoscope insertion part with the rod.

  According to a seventh aspect of the present invention, the endoscope insertion portion includes, as the reinforcing means, a structure in which the electric wire is covered with a metal flexible tube capable of bending deformation and transmitting a pressing force. An industrial endoscope apparatus according to Item 5, is provided.

  According to the seventh aspect of the present invention, as the reinforcing means, the electric wire is covered with a metal flexible tube (for example, a flexible tube) that can be bent and deformed and can transmit a pressing force. The electric wire is reinforced to facilitate transmission of the pushing force when pushing the endoscope insertion portion.

  According to an eighth aspect of the present invention, the reinforcing means is applied rearward at a predetermined interval from the front end of the electric wire, and the front electric wire not provided with the reinforcing means is covered with a resin tube. The industrial endoscope apparatus according to any one of claims 5 to 7, wherein the outer side of the wire is externally fitted with a metal coil tube, thereby imparting resilience to bending to the electric wire therebetween. .

  In the invention described in claim 8, the reinforcing means is applied to the rear of the electric wire at a predetermined distance from the front end, and the electric wire at the front end portion where the reinforcing means is not applied is covered with a resin tube. The outside is externally fitted with a metal coil tube. As a result, the electric wire at the front end portion is imparted with resilience to bending, and even when there is a bent portion in the middle of the drilling water discharge hole of the drilling bit, the section with resilience is freely deformed. Thus, it becomes possible to pass through the bent portion.

  As the present invention according to claim 9, in the endoscope insertion portion, the distal end portion includes a small diameter portion and a large diameter portion connected to the rear of the small diameter portion, and the distal end of the small diameter portion The industrial endoscope according to any one of claims 5 to 8, wherein a camera is mounted, and illumination means for irradiating the front of the front surface of the large-diameter portion around the small-diameter portion is provided. An apparatus is provided.

  In the invention of claim 9, as the distal end structure of the endoscope insertion portion, the distal end portion includes a small diameter portion and a large diameter portion connected to the rear of the small diameter portion, and the small diameter portion A camera is mounted at the front end of the lens, and illumination means for irradiating the front of the periphery of the small-diameter portion on the front end surface of the large-diameter portion is provided. As a result, since the tip of the tip is formed thin, even when pebbles or the like enter the rod or drill bit, the pebbles can be pushed away and inserted easily.

  As the present invention according to claim 10, in the endoscope insertion portion, the illumination portion for irradiating the front is located on the rear side from the tip portion. The industrial endoscope according to any one of claims 5 to 8. An apparatus is provided.

  The invention defined in claim 10 stipulates that the illumination means for irradiating the front side may be located on the rear side from the tip portion on which the camera is mounted. As a result, the tip portion can be reduced in size, so that the endoscope insertion portion can be more easily pushed into the rod.

As the present invention according to claim 11, a feeding assist device for assisting in feeding the endoscope insertion portion is provided at the proximal end of the rod,
The feeding auxiliary device includes a connecting portion for the rod at the front end, and is formed and installed in a hollow cylindrical main body portion that penetrates the front end surface and the rear end surface, and is formed into a pipe shape inside the main body portion. The endoscope insertion part is inserted from the opening of the rear end surface, a sealing auxiliary tool for achieving a seal with the endoscope insertion part and a seal with the body part, and the body part with the sealing aid And a joint to which a fluid feeding means for pouring fluid into the rod is connected,
While feeding the fluid into the rod while feeding the endoscope insertion portion through the opening at the rear end surface of the sealing auxiliary tool, the endoscope insertion portion is given a propulsive force in the insertion direction. An industrial endoscope apparatus according to any one of claims 5 to 10 is provided.

  In the invention according to the eleventh aspect, in order to assist the feeding of the endoscope insertion portion into the rod, the fluid is poured into the rod while feeding the endoscope insertion portion, thereby inserting the endoscope insertion portion into the insertion direction of the endoscope. A feed assist device that provides a propulsive force toward the rod is provided at the proximal end of the rod.

  According to a twelfth aspect of the present invention, the endoscope insertion portion has a side-view function for photographing a direction orthogonal to the longitudinal direction, or a perspective function for photographing obliquely forward or obliquely backward with respect to the longitudinal direction. Item 14. An industrial endoscope apparatus according to any one of Items 5 to 11.

  In the invention described in claim 12, the endoscope insertion portion is provided with a side-view function for photographing a direction orthogonal to the longitudinal direction or a perspective function for photographing obliquely forward or obliquely backward with respect to the longitudinal direction. By using it, the inside of the drilling hole can be observed over a wide range.

  As the present invention according to claim 13, the endoscope insertion section is provided with an industrial endoscope function according to any one of claims 5 to 12, which has a stereo photographing function for obtaining an image with two lenses having parallax at the tip. A mirror device is provided.

  In the invention described in claim 13, the endoscope insertion portion is provided with a stereo photographing function for obtaining an image with two lenses having parallax at the tip, so that the opening width or length of a crack in the natural ground from the photographed image is obtained. In addition, the size of gravel can be easily grasped.

  As the present invention according to Claim 14, the endoscope insertion section is provided with the industrial endoscope apparatus according to any one of Claims 5 to 11, which is provided with a sample collection function by including a treatment tool at a distal end. Is done.

  In the invention described in claim 14, when the endoscope insertion portion is provided with a sample collection function for collecting a sample with a treatment tool provided at the distal end, the collected sample is analyzed to confirm a rock type and the like. It can be used as a powerful judgment material.

  As described above in detail, according to the present invention, it is possible to search even in a natural mountain where the hole wall easily collapses, and it is possible to directly grasp the natural condition and to search with simple operations.

It is sectional drawing of the tunnel which shows the drilling formation point of the face S by the drill jumbo 2. FIG. It is sectional drawing of the face S vicinity which shows this geological exploration method. (A) is an enlarged sectional view of the drill bit 4, and (B) is a view from the front end of the drill bit 4. It is sectional drawing of the face S vicinity which shows the modification of this geological exploration method. It is a perspective view of endoscope insertion part 6 concerning other examples. It is a disassembled perspective view of the endoscope insertion part 6 which concerns on another form example. It is a perspective view which shows the display 7 and the controller 8. FIG. It is a perspective view of endoscope insertion part 6 concerning other examples. It is a perspective view of endoscope insertion part 6 concerning other examples. FIG. 4 is an exploded perspective view of a feeding auxiliary device 21. It is sectional drawing of the feeding auxiliary | assistance apparatus 21. FIG. FIG. 6 is an exploded perspective view of an endoscope insertion portion 6 including a treatment tool 30.

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

  As shown in FIG. 1, for example, in the case of excavation of a mountain tunnel by the blasting method, tunnel heavy equipment such as a drill jumbo 2, a sprayer, a wheel loader, etc. are arranged in the vicinity of the face S. After drilling rock bolts and charge holes / charges in the upper half and lower half by the mini-bench method, which excavates by the simultaneous work of the half and lower half, cut the upper half and lower half at once, then Excavation is carried out for each predetermined section length (every cycle) in the sequence of slipping out, hitting, primary blowing, support building, secondary blowing, and rock bolting.

  According to the geological exploration method in front of the face of the tunnel according to the present invention, by performing geological exploration in front of the face every multiple tunnel excavation cycles, it is possible to avoid a face collapse during tunnel excavation and to perform safe and economical excavation. To be able to do.

  In this geological exploration method, as shown in FIG. 1, a drilling machine for drilling with a rod 3 provided with a drifter 2a on a guide cell 2b so as to be able to move forward and backward and having a drilling bit 4 at the tip. In the process of drilling the ground in front of the face S with one or more rods by drilling the jumbo 2 equipped with, as shown in FIG. The drilling is interrupted, the rod 3 is retracted together with the drifter 2a by a predetermined distance, and the drifter 2a is separated from the rod 3, and the drilling water supply path 3a (see FIG. 3) is passed from the base end side of the rod 3. The endoscope insertion part 6 of the industrial endoscope apparatus 1 is fed, and the tip of the endoscope insertion part 6 is externally (drilled) from the drilled water discharge hole 5 (see FIG. 3) of the drill bit 4. And drilling bit by the endoscope insertion part 6. 4 from the probe the status of the front natural ground.

  As shown in FIG. 2, the industrial endoscope apparatus 1 used in the geological exploration method is inserted into the drilling water supply path 3 a of the rod 3 and the drilling water discharge hole 5 of the drilling bit 4. Mainly from a possible endoscope insertion section 6, a controller 8 for operating the endoscope insertion section 6, and a display 7 for displaying an image taken by a camera attached to the tip of the endoscope insertion section 6. Configured.

  Although it does not specifically limit as said drill jumbo 2, It is desirable to use the well-known drill jumbo deployed at a tunnel excavation site as shown in FIG. The drill jumbo 2 is provided with a drifter 2a that can be moved forward and backward on the guide cell 2b, and a drill bit 4 is provided at the tip of the rod 3, and the rear end of the rod 3 is connected to the drifter 2a, It is equipped with a drilling machine that drills holes while adding multiple rods of length. The drifter 2a gives a rotational force to the rod 3, and also gives a forward thrust to the rod 3 by moving forward and backward on the guide cell 2b. The rotational force and propulsive force by the drifter 2a are transmitted to the bit 4 through the rod 3, and the rock or ground is excavated by the drilling bit 4.

  The rod 3 is extended while adding a plurality of rods of a predetermined length via an intermediate coupling according to the drilling depth. The rod 3 is provided with a drilled water feed path 3 a communicating in the longitudinal direction, and the drilled water feed path 3 a is opened at both ends of the rod 3 in the longitudinal direction.

  The drilling bit 4 excavates rock and ground by transmitting the rotational force of the drifter 2a and the axial propulsive force of the drifter 2a moving forward on the guide cell 2b. The drill bit 4 is provided with a drill water discharge hole 5 communicating with the drill water supply path 3 a of the rod 3, and the drill water discharge hole 5 opens at the tip of the drill bit 4. ing.

  The drilling water supply path 3a and the drilling water discharge hole 5 communicate in the axial direction from the base end of the rod 3 to the tip of the bit 4, and open at the base end of the rod 3 and the tip of the bit 4, respectively. It is a communication hole. The endoscope insertion portion 6 can be inserted into the drilled water supply path 3a and the drilled water discharge hole 5. Moreover, as a hole which inserts the endoscope insertion part 6, the through-hole (not shown) for inserting the endoscope insertion part 6 apart from the thing for feeding such drill water May be provided separately.

  Depending on the type of the drilling bit 4, the drilling water discharge hole 5 formed in the drilling bit 4 may be formed linearly or may be branched into a plurality at the bit tip. For example, in the case of a cross bit, it is common that a single drilled water discharge hole 5 is provided linearly in the shaft core and one opening is provided in the center of the bit tip. In this case, there are many that branch into a plurality of about 2 to 4 at the tip, and a plurality of openings are provided at the tip of the bit. For this reason, the drilling water discharge hole 5 is not limited to a straight one over the entire length, but may have a structure that bends at the tip of the drilling bit 4.

  The drilling water supply path 3a provided in the rod 3 and the drilling water discharge hole 5 provided in the drilling bit 4 are each formed in a circular cross section, and the outer diameter of the endoscope insertion portion 6 is reduced. If the diameter is 6 mm, the size is such that it can be inserted and is thicker than 6 mm and at most about 15 mm in diameter.

  The endoscope insertion portion 6 may be either a flexible fiberscope or a borescope (rigid endoscope) using a hard metal tube. When a button bit is used in which the perforated water discharge hole 5 branches at the distal end portion of the bit 4, a fiberscope is used as the endoscope insertion portion 6, so that the fiberscope can be separated from the branched portion of the drilled water discharge hole 5. It is preferable that the direction of the fiberscope can be changed freely so that the tip of the fiberscope can be inserted to a position where it can protrude from the drilling water discharge hole 5 of the drilling bit 4 to the outside. Further, as will be described in detail later, it is also possible to use an endoscope insertion portion 6 that is easily pushed into the rod 3.

  As shown in FIG. 2, the endoscope insertion section 6 has an ultra-compact camera (CCD sensor or CMOS sensor) mounted on the distal end side and a full-color image captured by the camera on the proximal end side. It is preferable to use a video scope to which a display 7 (LCD or the like) for projecting is connected. A controller 8 for operating the endoscope is provided on the proximal end side of the endoscope insertion portion 6. The display 7 and the controller 8 on the other end side may be provided as a single unit, or an integrated device (see FIG. 7) in which these are integrally incorporated may be used.

  In the process of drilling while adding the rod 3, if the geological exploration site is reached, the drilling is temporarily interrupted, and the rod 3 is retracted together with the drifter 2a by a predetermined distance, that is, the rod 3 and the drilling hole. A space for causing the distal end of the endoscope insertion portion 6 to protrude outward from the drilling water discharge hole 5 of the drilling bit 4 in front of the drilling bit 4 by slightly pulling the drill bit 4 back to the hand side. Form. Thereafter, the drifter 2a is separated from the rod 3, and the endoscope insertion portion 6 is fed from the proximal end side of the rod 3 through the drilling water supply path 3a.

  When the endoscope insertion portion 6 searches the ground condition, it feeds the distal end to which the camera is attached from the proximal end side of the rod 3 through the drilling water feed path 3a and the end portion of the endoscope insertion portion 6 By projecting from the drilling water discharge hole 5 of the drilling bit 4 to the outside (inside of the drilling hole), the ground in front of the bit 4 can be directly photographed. The state in which direct photographing is possible is that no member is interposed between the distal end of the endoscope insertion portion 6 and the hole wall (natural ground).

  Thus, in this geological exploration method, when inserting the endoscope insertion portion 6 into the drilling hole, the rod 3 can be inserted instead of the casing, so that the hole wall is not self-supporting, the bedrock is poor, and the skin is rough. Even in a remarkable case, the endoscope insertion portion 6 can be inserted into the drilling hole, and the endoscope insertion portion 6 can be searched.

  Further, in this geological exploration method, when observing with the endoscope insertion portion 6, the distal end of the endoscope insertion portion 6 protrudes outside from the drilled water discharge hole 5 of the drill bit 4, that is, the inner Since the condition of the natural ground in the drilling hole can be directly photographed with nothing interposed between the distal end of the endoscope insertion portion 6 and the natural ground, the state of the natural ground such as a change in geology or a crack in the natural ground is directly And it becomes possible to grasp in detail.

  Further, the geological exploration work is a process of drilling with the drill jumbo 2, and when the geological exploration site is reached, the drilling is temporarily interrupted, and the rod 3 is moved backward together with the drifter 2a by a predetermined distance. Since the simple operation of inserting the endoscope insertion portion 6 from the proximal end side of the rod 3 is not necessary, the troublesome work such as pulling out the drill is unnecessary, and the workability is good. Economical and efficient.

  By the way, when drilling with the drill jumbo 2, a drilling logging system that predicts geology based on drilling data such as drilling speed (only lowering) and drilling energy is applied. You may employ | adopt the method of investigating the condition of a natural ground precisely by the endoscope insertion part 6 about the position where geology may change. The drilling logging system (DRISS) measures drilling data of the drill jumbo 2 and evaluates natural ground properties of the drilling section from the obtained data. The drilling data to be measured includes drilling hydraulic pressure (feed pressure, rotational pressure, impact pressure, damping pressure), drilling oil amount (feed distance, drilling speed), and the like. These are converted into various data for the purpose of evaluating the natural ground, and the natural ground conditions are assumed together with visual data such as the properties and the amount of spring water. The drilling logging system predicts geology from indirect information such as drilling energy at the time of drilling. There was a problem that the exact situation of the mountain could not be grasped. However, by using the borehole logging system in combination with the geological exploration method using the endoscope insertion portion 6 according to the present invention, it is possible to efficiently and directly observe a portion where the geology changes such as a fractured zone. It becomes like this.

  Also, in geological exploration using the borehole logging system, if it is determined that the drilling logging system has reached a fractured zone or the like where the geology may change, the drifter 2a is moved by the length of the section to be observed. At the same time, the rod 3 is retracted to expose the hole wall such as the crush band to be observed in front of the drill bit 4 into the drill hole, and then the endoscope insertion portion 6 is fed into the front of the drill bit 4. You may make it investigate the condition of natural grounds, such as the said crushing zone.

  In observing the condition of the natural ground by the endoscope insertion portion 6, the endoscope insertion portion 6 is used for drilling with the distal end of the endoscope insertion portion 6 protruding from the drilling bit 4. With the observation of the front of the bit 4 continued, the rod 3 and the bit 4 are pulled out without rotation by an indexing instrument such as a manual or electric winch or a lever block (registered trademark), so that the condition of the ground in the drilling hole May be continuously explored in the axial direction. As a result, it becomes possible to continuously observe a wide range of hole walls, and the change in geology can be observed more clearly. Here, when the drilling hole is a collapsible hole wall, the rod 3 and the drilling bit 4 are pulled out by the indexing instrument and pulled out while synchronizing the endoscope insertion portion 6 with the indexing tool. It is preferable to continuously explore the condition of natural ground in the axial direction. On the other hand, when the hole is a self-supporting hole wall, as shown in FIG. 4, after the rod 3 and the hole bit 4 are pulled out by the indexing instrument, the endoscope insertion portion 6 is independently moved back and forth. It is preferable to observe the hole wall. At this time, the endoscope insertion portion 6 is arbitrarily moved by the hand of the worker.

  The endoscope insertion section 6 is generally provided with a direct viewing function for directly viewing the longitudinal direction (the axial direction of the endoscope insertion section 6), but a side viewing function for photographing a direction orthogonal to the longitudinal direction. Or you may use what was provided with the perspective function which image | photographs diagonally forward or diagonally back with respect to a longitudinal direction. When a fiberscope is used as the endoscope insertion portion 6, the tip can be flexibly bent, so that the hole wall is relatively easy to observe, but the hole wall cannot be viewed from the front in the vertical direction. It is preferable to use one having the side view function or the perspective function.

  The endoscope insertion unit 6 may be provided with a stereo photographing function for obtaining an image with two lenses having parallax at the tip. Thereby, from the obtained image, the opening width and length of the crack in the natural ground, the size of the gravel, etc. can be measured by the triangulation method. Further, by providing the stereo photographing function, distance measurement between two points, surface shape measurement, area measurement and the like can be performed.

  Furthermore, the endoscope insertion portion 6 may have a function of collecting a sample in the drilling hole by providing a treatment tool at the tip. By analyzing the collected samples, it can be used as a powerful judgment material when confirming rock types. As the treatment tool at the tip, it is preferable to use a tool having a clamping function capable of picking up stones and sand in the hole.

  Next, as a modification of the endoscope insertion portion 6, a description will be given of a configuration in which reinforcing means for facilitating transmission of the pushing force when the endoscope insertion portion 6 is fed from the proximal end side of the rod 3 is described. To do.

  Here, as shown in FIGS. 5 and 6, the endoscope insertion portion 6 extends rearward from the distal end portion 11 on which the camera 9 is mounted, and operates the camera 9. And an electric wire 12 through which an electric signal, a power source of the camera 9 and the like are transmitted. Further, a plurality of illumination means 10 such as LEDs for illuminating the front are provided along the circumferential direction at the distal end side of the endoscope insertion portion 6, and the power supply of these illumination means 10 is transmitted through the electric wires 12. Has been.

  First, a first modification example in which the above-described reinforcing means is applied will be described. In the endoscope insertion portion 6 according to the first modification, as the reinforcing means, a linearly made fiber rod 13 made of a metal material such as stainless steel and having a higher bending rigidity than the electric wire 12 is juxtaposed as the reinforcing means. The electric wire 12 and the fiber rod 13 are integrally covered with a blade tube 14. The blade tube 14 is formed by braiding a wire or strip such as stainless steel around the outer periphery of a tube-shaped resin material, and has a role of preventing deformation of the internal member and protecting it from the outside. . As the braided material shape, any of a round wire blade, a flat wire blade, and a twill wire blade may be used.

  In the endoscope insertion portion 6 according to the first modification, the electric wire 12 is reinforced by the linear and relatively high bending rigidity of the fiber rod 13, so that the endoscope insertion portion 6 is moved from the proximal end side of the rod 3. The bending of the electric wire 12 at the time of feeding is suppressed, and the pushing force pushed from the hand side is easily transmitted over the entire length of the endoscope insertion portion 6.

  The fiber rod 13 and the electric wire 12 are joined to each other, so that the reinforcing effect of the electric wire 12 by the fiber rod 13 is increased, and the pushing force when the endoscope insertion portion 6 is fed from the proximal end side of the rod 3 is transmitted. This is preferable because it is easily performed.

  As shown in FIGS. 5 and 6, it is preferable that the reinforcement by the fiber rod 13 is performed behind the electric wire 12 at a predetermined interval. The electric wire 12 that is reinforced by the fiber rod 13 from the rear to the front is covered with a resin tube 15 and the outer side thereof is externally fitted with a metal coil tube 16 so that the electric wire 12 therebetween It is preferable to impart elasticity to bending. As a result, the state in which the distal end portion 11 extends straight from the section reinforced by the fiber rod 13 is maintained, and when an external force in the bending direction acts on the distal end portion 11, the section to which the elasticity is imparted is retained. It will be elastically deformed freely and the tip part 11 will be in the bent state. In addition, at the boundary portion between the section reinforced by the fiber rod 13 and the section imparted with resilience, a recess that is fitted around the end of the blade tube 14 is formed on the side of the reinforced section. A base 17 is provided on the side of the section to which resilience is imparted. The base 17 is provided with a convex portion on which the ends of the tube 15 and the coil tube 16 are fitted.

  Even when the drilling water discharge hole 5 branches into a plurality at the tip of the drilling bit 4 by imparting elasticity to the electric wire 12 ahead of the section reinforced by the fiber rod 13, The portion having elasticity is freely deformed so that the distal end of the endoscope insertion portion 6 can protrude from the drill bit 4.

  The resin-made tube 15 covered in the section imparted with resilience may be a straight tube that is linear in the axial direction or a bent tube that is curved in the axial direction. By using the bending tube, the distal end portion is easily bent along the bending tube when passing through the bent passage, and the endoscope insertion portion 6 is easily pushed.

  As shown in FIG. 7, a terminal that can be connected to a terminal provided in the controller 8 is attached to the proximal end of the electric wire 12, and is attached by the camera 9 of the endoscope insertion unit 6. The photographed image is taken into the controller 8 through the electric wire 12 and is displayed on the display 7 provided integrally with the controller 8 and the connection cable 18.

  Next, the endoscope insertion portion 6 according to the second modification will be described. As shown in FIG. 8, the reinforcing means is made of metal that can be bent and deformed and can transmit a pushing force to the outer periphery of the electric wire 12. The flexible tube 19 is covered. The flexible tube 19 is a flexible tube (a metal corrugated tube in which a plurality of crests and valleys are formed in the circumferential direction is covered with a covering such as a resin) or a coil tube (a metal tube). This is a tube made of a metal such as stainless steel having flexibility called a wire wound closely in a coil shape so that adjacent wires are in contact with each other. A tube that has rigidity against compression. By covering the outer periphery of the electric wire 12 with the flexible tube 19, the pushing force from the hand side is efficiently transmitted through the flexible tube 19, and the endoscope insertion portion 6 is easily pushed. Further, when the passage is bent in the middle, the flexible tube 19 is deformed flexibly and can pass through the bent portion.

  In the endoscope insertion portion 6 according to the second modification, as shown in FIG. 8, the flexible tube 19 is connected to the electric wire in the same manner as the endoscope insertion portion 6 according to the first modification. 12 is provided at a predetermined interval from the front end to the rear, and the electric wire 12 in front of the reinforcing section of the flexible tube 19 is covered with a resin tube 15 and the outside thereof is externally fitted with a metal coil tube 16. You may make it do.

  Furthermore, as the endoscope insertion portion 6 according to the third modified example, as shown in FIG. 9, the distal end portion 11 includes the small diameter portion 11 a and the thin diameter portion 11 as the distal end structure of the endoscope insertion portion 6. A large-diameter portion 11b connected to the rear of the diameter portion 11a, the camera 9 is mounted at the tip of the small-diameter portion 11a, and is a front end surface of the large-diameter portion 11b, which is the front-end surface of the small-diameter portion 11a. The illumination means 10 which irradiates the front to the circumference | surroundings can be provided. As a result, the distal end of the distal end portion 11 becomes thin, so that even if foreign matter such as pebbles or sand gets into the passage of the endoscope insertion portion 6, it can move forward while pushing away the foreign matter. Easy to push.

  Further, the end surface of the large-diameter portion 11b to which the illuminating means 10 is attached may be a vertical surface orthogonal to the axial direction, or as shown in FIG. 9, the axis core side is inclined forward. It may be a surface. The inclined surface is more preferable because the effect of pushing away foreign substances existing in the passage is enhanced.

  Moreover, in the endoscope insertion portion 6 according to the third embodiment, as shown in FIG. 8, the illumination means 10 for irradiating the front is located on the rear side from the distal end portion 11 on which the camera 9 is mounted. It is possible. In other words, the illumination means 10 is not necessarily provided at the tip portion 11 on which the camera 9 is mounted, and may be provided behind the tip portion 11. Thereby, the front-end | tip part 11 can be reduced further and it becomes easy to push in the endoscope insertion part 6. FIG. Further, in this case, the length of the tip 11 formed with a diameter smaller than that of the electric wire 12 is set slightly longer than the length of the drilling water discharge hole 5 of the drilling bit 4, thereby cutting the tip 11. The permeability to the perforated water discharge hole 5 is improved, and the front end side can be illuminated through the drilled water discharge hole 5 from the rear.

  In the endoscope insertion portion 6 according to the fourth modification, as shown in FIGS. 10 and 11, when feeding the endoscope insertion portion 6, the endoscope insertion portion 6 is disposed at the proximal end of the rod 3. A feeding assisting device 21 for assisting feeding is provided. The feeding auxiliary device 21 is provided with a connecting portion for the rod 3 at the front end, and has a hollow cylindrical main body portion 22 penetrating the front end surface and the rear end surface, and is inserted into the main body portion 22 in the form of a pipe. In addition, the endoscope insertion portion 6 is inserted from the opening at the rear end surface, and a sealing auxiliary tool 26 for sealing between the endoscope insertion portion 6 and the main body portion 22 is provided. The main body 22 includes a joint 27 to which fluid feeding means (not shown) such as a pump or a blower for flowing a fluid such as water or air into the rod 3 is connected. The seal between the main body portion 22 and the sealing auxiliary tool 26 includes a soft resin sealing material 23 interposed between the main body portion 22 and the sealing auxiliary tool 26, and the front end of the sealing material 23. In a state in which is fastened to a stepped portion formed in the main body 22, a fastening member 25 that is screwed to the main body 22 is screwed in from the rear end side of the main body 22 through a washer 24. Thus, the tightening member 25 compresses the sealing material 23 so that the inner periphery of the sealing material 23 comes into close contact with the outer periphery of the auxiliary sealing tool 26. Further, the seal between the sealing auxiliary tool 26 and the endoscope insertion portion 6 is formed with a tapered tip contact portion 26a at the front end of the sealing aid 26, and this tip contact portion 26a is used as the endoscope insertion portion. It is made by sticking to the outer periphery of 6. The feeding auxiliary device 21 is screwed and fixed to the proximal end of the rod 3 via the connecting member 28.

  In the feeding auxiliary device 21, as shown in FIG. 11, a fluid is poured into the rod 3 while feeding the endoscope insertion portion 6 from the opening of the rear end surface of the sealing auxiliary tool 26, thereby allowing the endoscope to Propulsive force in the insertion direction is applied to the insertion portion 6. For example, when water is poured into the rod 3, friction between the endoscope insertion portion 6 and the inner surface of the rod 3 is reduced, and the distal end portion 11 of the endoscope insertion portion 6 is moved from the rear side. The feeding of the endoscope insertion portion 6 can be assisted by the action of water pressure.

  By the way, the detailed structure of the endoscope insertion portion 6 having the above-described sample collection function will be described with reference to FIG. 12. The endoscope insertion portion 6 is for treatment with a treatment instrument 30 attached to the tip. The cable 31 is juxtaposed with the electric wire 12, the electric wire 12 and the treatment cable 31 are integrally covered with a pipe material 32, and the endoscope insertion portion is connected to the distal end of the pipe material 32 via a base 33. It is preferable to have a structure in which an attachment member 34 in which an opening 35 for inserting the six electric wires 12 and an opening 36 for inserting the treatment cable 31 are formed in parallel is combined. As the pipe member 32, it is preferable to use the metal flexible pipe 19 which can be bent and deformed and which can transmit the pushing force.

  An opening 35 for inserting the electric wire 12 of the endoscope insertion portion 6 provided in the attachment member 34 has a width that penetrates from the outer periphery of the attachment member 34 to the opening 35 so that the electric wire 12 can be inserted. It is preferable that the formed electric wire 12 can be inserted into the opening 35 from the slit 35a by providing the formed slit 35a over the entire length in the axial direction. The treatment instrument 30 may be disposed in advance in a state of being inserted into the opening 36 of the attachment member 34, or a tube extending from the opening 36 to the hand side through the tube 32 is necessary. Accordingly, the treatment instrument 30 and the treatment cable 31 may be inserted into the tube to be retrofitted.

  DESCRIPTION OF SYMBOLS 1 ... Industrial endoscope apparatus, 2 ... Drill jumbo, 2a ... Drifter, 3 ... Rod, 3a ... Drilling water feed path, 4 ... Drilling bit, 5 ... Drilling water discharge hole, 6 ... Endoscope Mirror insertion part, 7 ... display, 8 ... controller, 9 ... camera, 10 ... illumination means, 11 ... tip part, 12 ... electric wire, 13 ... fiber rod, S ... face

Claims (14)

  A drill jumbo equipped with a drilling machine for drilling with a rod provided with a drilling bit at the tip is provided on the guide cell so that the drifter can move forward and backward. In the process of drilling while adding the rod, if the geological exploration point is reached, the drilling is temporarily interrupted, the rod is retracted together with the drifter for a predetermined distance, and the drifter is separated from the rod, and the rod The endoscope insertion portion of the industrial endoscope apparatus is fed from the base end side of the endoscope through the drilling water supply path, and the tip is projected to the outside from the drilling water discharge hole of the drilling bit. A geological exploration method in front of the face of a tunnel, characterized in that the state of a natural ground in front of the drilling bit is explored by an insertion portion.   The geological exploration method in front of the face of a tunnel according to claim 1, wherein a fiberscope is used as the industrial endoscope apparatus.   When drilling with the drill jumbo, a drilling logging system that predicts geology from drilling data is applied, and when the drilling logging system is predicted to have reached a boundary where geology changes, the endoscopic The geological exploration method in front of the face of a tunnel according to any one of claims 1 and 2, wherein the state of a natural ground is explored by a mirror insertion part.   With the tip of the endoscope insertion part protruding outside from the drilling water discharge hole of the drilling bit, the rod and the drilling bit are pulled out by a traction tool, and the endoscope insertion part is The geological exploration method in front of the face of the tunnel according to any one of claims 1 to 3, wherein the state of the natural ground in the drilling hole is continuously explored in the axial direction by pulling out in synchronization. An industrial endoscope apparatus for exploring geology in a drilling hole drilled by a drill jumbo equipped with a drilling machine for drilling with a rod having a drilling bit at the tip,
The industrial endoscope apparatus includes an endoscope insertion portion that can be inserted into the drilling water supply path of the rod and the drilling water discharge hole of the drilling bit,
The endoscope insertion portion includes a distal end portion on which a camera is mounted and an electric wire extending rearward from the distal end portion, and a pushing force when the endoscope insertion portion is fed from the proximal end side of the rod. An industrial endoscope apparatus comprising reinforcing means for facilitating transmission.   The industrial endoscope according to claim 5, wherein the endoscope insertion portion includes, as the reinforcing means, a structure in which fiber rods are juxtaposed with the electric wires, and the electric wires and the fiber rods are integrally covered with a blade tube. Endoscopic device.   The industrial endoscope according to claim 5, wherein the endoscope insertion portion includes, as the reinforcing means, a structure in which the electric wire is covered with a metal flexible tube that can be bent and deformed and can transmit a pressing force. apparatus.   The reinforcing means is applied behind the front end of the electric wire at a predetermined interval, covers the front electric wire without the reinforcing means with a resin tube, and the outside of the electric wire with a metal coil tube. The industrial endoscope apparatus according to any one of claims 5 to 7, wherein an elastic fit with respect to bending is imparted to the electric wire in the meantime by external fitting.   In the endoscope insertion portion, the distal end portion includes a small diameter portion and a large diameter portion connected to the rear of the small diameter portion, the camera is mounted at the distal end of the small diameter portion, and the large insertion portion The industrial endoscope apparatus according to any one of claims 5 to 8, further comprising an illuminating unit that irradiates the front of the diameter portion around the front end surface of the diameter portion.   The industrial endoscope apparatus according to any one of claims 5 to 8, wherein the endoscope insertion portion has an illumination portion that irradiates the front side located behind the tip portion. A feeding assist device for assisting in feeding the endoscope insertion portion is provided at the proximal end of the rod,
The feeding auxiliary device includes a connecting portion for the rod at the front end, and is formed and installed in a hollow cylindrical main body portion that penetrates the front end surface and the rear end surface, and is formed into a pipe shape inside the main body portion. The endoscope insertion part is inserted from the opening of the rear end surface, a sealing auxiliary tool for achieving a seal with the endoscope insertion part and a seal with the body part, and the body part with the sealing aid And a joint to which a fluid feeding means for pouring fluid into the rod is connected,
While feeding the fluid into the rod while feeding the endoscope insertion portion through the opening at the rear end surface of the sealing auxiliary tool, the endoscope insertion portion is given a propulsive force in the insertion direction. The industrial endoscope apparatus according to any one of claims 5 to 10.   The said endoscope insertion part is provided with the side view function which image | photographs the direction orthogonal to a longitudinal direction, or the perspective function which image | photographs diagonally forward or diagonally back with respect to a longitudinal direction. Industrial endoscope device.   The industrial endoscope apparatus according to any one of claims 5 to 12, wherein the endoscope insertion unit has a stereo photographing function for obtaining an image with two lenses having parallax at a distal end.   The industrial endoscope apparatus according to any one of claims 5 to 11, wherein the endoscope insertion portion has a sample collection function by including a treatment tool at a distal end.

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