Sump water observation device, and formation and separation method thereof

Abstract

To provide a sump water observation device and a sump water observation method, which can safely and efficiently grasp a state of sump water in front of a pit face by eliminating the need for mounting and collecting a packer to a bore hole with man power.SOLUTION: A sump water observation device 100 for taking in sump water W from a tip of a bore hole B has: an axial unit 60 where a packer device 20 and a double pipe rod 30 are connected to each other and that comprises an observation instrument 48; a moving device 17 that withdraws the axial unit 60 from the bore hole B; a first flow channel that is provided at an inside of the axial unit 60 and makes conveyed water reach an inside surface of the packer 26; and a second flow channel that makes the sump water W taken in the packer device 20 reach the observation instrument 48. The sump water observation device further has: a rotation restraint fixture 200 that is bridged across a part of the axial unit 60 and the moving device 17 to restrain both relative rotations with it impossible; and a rotation restraining part 18A that prevents co-rotation by restraining the other part of the axial unit 60 when rotating the moving device 17.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a water gushing observation device and a method for forming and separating the same.

Background Art

[0002] In the construction of mountain tunnels, it is essential to grasp the state of water gushing such as the amount of water gushing and the water gushing pressure in the water gushing area in front of the face, and to take water gushing countermeasures in advance. As a method for grasping this water gushing state, a boring hole (advanced boring hole) is provided in the face, and a packer is inserted into the hole bottom while adding a rod equipped with a packer (packer rod) manually. After measuring the amount of water gushing and the water gushing pressure, a method of pulling out and recovering the packer rod manually is generally applied. However, this method has a problem in safety because people enter directly under the face. In addition, in a situation where water gushing is drained from the boring hole, a lot of labor is required for the work of inserting the packer and the work of pulling it out and recovering it. In particular, for a boring hole located at a high place such as near the top end of the face, since it is a work on the man cage of the drilling machine or on the bucket of the aerial work vehicle, it can be an even more difficult work. Further, when the water gushing pressure is high, there is a risk that the packer may spout out from the boring hole, so packer pressing equipment etc. for preventing the packer from spouting out is required, and it takes time and effort to grasp the water gushing state.

[0003] From the above, there is a demand for a water gushing observation device that can grasp the state of water gushing (amount of water gushing, water gushing pressure, water quality, etc.) in front of the face safely and efficiently without the need for manual installation and recovery of the packer into the boring hole.

[0004] Here, Patent Document 1 proposes a double-tube double-packer method that performs excavation and injection using a drill jumbo and a packer. Specifically, a plurality of injection holes are provided in the peripheral wall, and an inner rod with a cutting bit attached thereto that transmits the impact force and rotational force received from a single-pipe boring machine capable of single-pipe boring to the ring bit is inserted into a casing having a ring bit attached to its tip. The ground is excavated by the inner rod connected to the single-pipe boring machine and the casing. After pulling out the inner rod and the cutting bit from the casing, a pipe with discharge holes formed therein is inserted into the casing, and a sealing material is filled in the gap between the casing and the pipe. An injection pipe having a pair of packers that separate the space inside the pipe and ejection holes provided between these packers is inserted into the pipe. In a state where the casing is installed in the ground, an injection material is supplied from the rear end of the injection pipe, and the injection material is injected into the ground from the injection holes through the ejection holes and the discharge holes.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] According to the double-pipe double-packer method described in Patent Document 1, although the sleeve pipe inserted into the hole formed in the ground and the injection pipe inserted into the sleeve pipe can be fixed via the packer, it does not propose a technique for eliminating the need for manual installation and recovery of the packer into the boring hole and for safely and efficiently grasping the state of water gushing in front of the face.

[0007] An object of the present invention is to provide a water gushing observation device and a water gushing observation method that can eliminate the need for manual installation and recovery of the packer into the boring hole and can safely and efficiently grasp the state of water gushing in front of the face.

Means for Solving the Problems

[0008] In order to achieve the above object, one aspect of the water gushing observation device according to the present invention is a water gushing observation device installed in a boring hole provided in the face, taking in water gushing from the tip of the boring hole and performing water gushing observation, comprising at least a packer device provided with a packer and a double pipe rod attached to one end of the packer device, which are connected to each other, and further comprising an axial unit provided with an observation meter, a moving device for inserting at least a part of the axial unit into the boring hole and pulling out the axial unit from the boring hole, a first flow path provided inside the axial unit for allowing the supplied water to reach the inner surface of the packer, and a second flow path for allowing the water gushing taken in by the packer device to reach the observation meter, further comprising a rotation restraint jig that restrains relative rotation between both across a part of the axial unit and the moving device, and a rotation restraint portion that restrains the other part of the axial unit during rotation of the part of the axial unit and the moving device to prevent rotation.

[0009] According to this aspect, it has a packer device, a double pipe rod, and an axial unit provided with an observation meter, a moving device for inserting and pulling out the axial unit into and from the boring hole, two water flow systems including a first flow path for allowing the supplied water to reach the inner surface of the packer and a second flow path for allowing the taken-in water gushing to reach the observation meter, and by measuring the physical quantity indicating the state of the water gushing with the observation meter, it is possible to grasp the state of the water gushing in front of the face safely and efficiently without the need for manual installation (insertion and expansion) and recovery of the packer into the boring hole. Furthermore, by further including a rotation restraint jig that irreversibly restricts relative rotation between both across a part of the shaft unit and the moving device, and a rotation restraint portion that restrains the other part of the shaft unit during rotation of a part of the shaft unit and the moving device to prevent rotation, when forming the water gushing observation device by connecting each component of the water gushing observation device while rotating, or when pulling out each component of the water gushing observation device from the boring hole and separating (or cutting) while rotating to remove the water gushing observation device, a plurality of connection points (or separation points) can be connected (or separated) in a suitable connection order (or separation order). Therefore, when connecting (or separating) a certain connection point (or separation point) while rotating, it is possible to prevent other connection points (or separation points) from rotating or other connection points (or separation points) from being connected (or separated) in advance.

[0010] Here, physical quantities indicating the state of water gushing include the amount of water gushing and the water gushing pressure. Also, in this aspect, in addition to measuring the physical quantity of water gushing that has reached the observation meter, observations such as water quality observation of the turbidity of water gushing and groundwater level observation are also included in "observation". Therefore, physical quantities and water quality of water gushing become the observation targets. Observation data (measurement data) by the observation meter may be acquired after recovering the shaft unit, or may be transmitted in real time to various portable terminals and computers such as a portable terminal in the operator's cabin of a trolley equipped with a moving device, a portable terminal carried by a measurement implementer, etc., by wireless communication from the observation meter, or a computer in a management facility outside the tunnel. Also, the double pipe rod may be one or a plurality, and may be sequentially added according to the length of the boring hole, for example. Also, the moving device may be a hydraulic cylinder mounted on a dump truck, an aerial work platform, etc., or a drilling machine for drilling a boring hole, etc., and various forms that can at least eliminate the installation of a double pipe rod and a packer into the boring hole by manual labor are applicable. In addition, "inserting at least a part of the shaft unit into the boring hole" means that, in addition to inserting the entire shaft unit, it includes inserting only the packer device and a part of the double pipe rod, etc. In actual operation, the latter is generally applied.

[0011] In addition, the water gushing observation device of this aspect can be applied to boring holes of various lengths, such as ultra-long boring holes with a length of about 1000 m, medium-sized boring holes with a length of about 100 m, and short boring holes with a length of about 30 m.

[0012] In addition, in another aspect of the water gushing observation device according to the present invention, The rotation restraint jig is a pipe wrench in which two half pipes are rotatably connected to each other via a rotation shaft, and are bolted to each other on the opposite side of the rotation shaft in a posture of gripping the gripping positions of both the moving device and the shaft unit. In at least one of the half pipes, a chuck piece having a large number of convex portions is provided at a position corresponding to the two gripping positions by bolts so as to be able to tighten the gripping position.

[0013] According to this aspect, the rotation restraint jig is formed by a pipe wrench in which two half pipes are rotatably connected and grip the gripping positions of both the shaft unit and the moving device. At a position corresponding to the two gripping positions in at least one of the half pipes, a chuck piece having a large number of convex portions is provided by bolts so as to be able to tighten the gripping position, thereby realizing smooth and firm gripping of the two gripping positions by the rotation restraint jig and realizing smooth removal of the rotation restraint jig.

[0014] In addition, in another aspect of the water gushing observation device according to the present invention, The rotation restraint jig is a double wrench that straddles the two gripping positions while surrounding the moving device and the shaft unit in a U-shape. Inside the inner sides of a pair of opposing side walls forming the U-shape, a chuck piece having a number of convex portions is provided by bolts at the gripping position of the moving device in a manner that enables tightening. The double pipe rod and the gripping position of the moving device are characterized by having flat gripping surfaces.

[0015] According to this aspect, the rotation restraint jig is formed by a double wrench straddling the gripping positions of both the shaft unit and the moving device while surrounding them both in a U-shape. Inside the inner sides of a pair of opposing side walls forming the U-shape, a chuck piece having a number of convex portions is provided by bolts at the gripping position in a manner that enables tightening, and since the gripping surfaces of both gripping positions are flat, smooth and firm gripping of the two gripping positions by the rotation restraint jig can be achieved, and smooth removal of the rotation restraint jig can be realized.

[0016] Moreover, another aspect of the water gushing observation device according to the present invention is further having a double pipe rod attached to one end of the packer device, a flow path switching adapter attached to one end of the double pipe rod and equipped with the observation gauge, and a first check valve attached to one end of the flow path switching adapter. The packer device, the double pipe rod, the flow path switching adapter, and the first check valve are interconnected to form the shaft unit. The first check valve is characterized by opening the first flow path when water is sent to the packer device and closing the first flow path when the return water returns from the packer device.

[0017] According to this aspect, the first check valve opens the first flow path when water is sent to the packer device and closes the first flow path when the return water returns from the packer device, thereby enabling both the supply of the required amount of water to the packer device and the maintenance of the packer pressure after the packer is opened.

[0018] Moreover, another aspect of the water gushing observation device according to the present invention is A water pressure measuring device is interposed between the flow path switching adapter and the first check valve, and the water pressure measuring device also forms the shaft-like unit. The water pressure measuring device measures at least the water pressure in the first flow path. The first check valve opens the first flow path when water is supplied to the packer device, and closes the first flow path when the return water returns from the packer device. The water pressure measuring device includes a main flow path forming the first flow path and a branch flow path branched from the main flow path. A second check valve is interposed in the middle of the branch flow path, and the second check valve closes the branch flow path when water is supplied to the packer device. A check valve is attached to the branch flow path, and the water pressure in the first flow path is measured.

[0019] According to this aspect, since a water pressure measuring device for measuring at least the water pressure in the first flow path is interposed between the flow path switching adapter and the first check valve, the water pressure in the first flow path and the water pressure in the packer communicating with the first flow path (both having the same value) can be measured, and it can be confirmed whether the packer is maintained at a desired water pressure (pressing force on the wall surface). Furthermore, the water pressure measuring device includes a main flow path forming the first flow path and a branch flow path branched from the main flow path, and a second check valve is interposed in the middle of the branch flow path, and the second check valve closes the branch flow path when water is supplied to the packer device, so that the liquid tightness of the first flow path when water is supplied to the packer device can be ensured.

[0020] A counterbore groove may be provided on the outer surface of the water pressure measuring device, a check valve is attached to the counterbore groove, and a pressure gauge or the like is attached to the check valve, so that the second check valve is opened by the check valve and the water pressure in the first flow path can be measured with the pressure gauge. In addition, a check valve may be attached to the water pressure measuring device, and at least one of additional water supply to the first flow path and drainage from the first flow path may be further performed. In this configuration, in addition to attaching a check valve to the water pressure measuring device and attaching a pressure gauge to the check valve to measure the water pressure in the first flow path, additional water supply to the first flow path and drainage from the first flow path are further performed, so that various functions can be provided to the water pressure measuring device. For example, if the water pressure required for the packer is insufficient as a result of measuring the water pressure in the first flow path, a water supply means can be connected to the check valve, and additional water supply can be performed in the first flow path to increase the pressure in the packer. Further, after the observation of the gushing water is completed, when draining the water to deflate the packer and recovering the packer device or the like from the boring hole, by installing a check valve in the counterboring groove, the second check valve is opened, and drainage can be performed through the branch flow path and the check valve.

[0021] Another aspect of the gushing water observation device according to the present invention is In a drilling machine including a carriage, a boom rotatably mounted on the carriage, a guide shell mounted at the tip of the boom, a drifter sliding along the guide shell, a shank rod mounted at the tip of the drifter, and a water supply means for supplying water to the shank rod, the drifter, the drifter, and the shank rod form the moving device, the axial unit is directly or indirectly connected to the shank rod, and water is supplied from the water supply means to the first flow path.

[0022] According to this aspect, the guide shell, the drifter, and the shank rod provided in the drilling machine form a moving device, and the axial unit is inserted into the boring hole by the drifter sliding along the guide shell, so that the axial unit can be stably inserted into the boring hole and stably recovered from the boring hole after the observation. In addition, for example, after drilling a boring hole with a drilling machine, an axial unit can be continuously installed in the boring hole by the same drilling machine, and physical quantities related to the state of water gushing can be efficiently measured. At this time, in a series of operations including drilling of the boring hole, installation of the axial unit into the boring hole, water gushing observation, and pulling out of the axial unit from the boring hole, by maintaining the initial positioning posture of the drilling machine and the initial posture of the tip of the boom that holds the guide shell of the drilling machine, it is preferable that the axial center of the drilled boring hole and the axial center of the axial unit can be made to coincide without alignment. Furthermore, the drilling machine is equipped with its own water supply means including a water supply pump, a water tank, a water supply pipe, etc., and during the drilling of the boring hole, the water supply means is operated to appropriately supply water. Therefore, by using the water supply means provided in this drilling machine, it is preferable that the water supply means peculiar to the water gushing observation device can be made unnecessary. As the drilling machine, a drill jumbo (registered trademark) equipped with a plurality of booms rotatably and telescopically in front of a carriage can be applied. In addition, "the axial unit is directly or indirectly connected to the shank rod" means that in addition to the first check valve forming the axial unit being directly connected to the shank rod, a push-in pipe or a special-shaped connector connected to the first check valve is connected to the shank rod. Therefore, it includes that the axial unit is indirectly connected to the shank rod.

[0023] When the water gushing pressure is relatively small and the installation state of the axial unit in the boring hole can be maintained only by the pressing force of the packer on the hole wall of the boring hole, the first check valve can be disconnected from the shank rod and the drilling machine can be applied to other uses (drilling of other boring holes, etc.). On the other hand, when the water gushing pressure is relatively large and the installation state of the axial unit in the boring hole cannot be maintained only by the pressing force of the packer on the hole wall of the boring hole, it is advisable to keep the drilling machine waiting in front of the face until the water gushing observation is completed, and hold the axial unit from the rear with a drifter and a shank rod.

[0024] In addition, another aspect of the water gushing observation device according to the present invention is that An irregular connector included in the moving device is further provided between the shank rod and the first check valve.

[0025] According to this aspect, an irregular connector (or a diameter conversion connector) is interposed between the shank rod provided in the drilling machine and the first check valve, so that the first check valve can be connected according to the diameter of the shank rod specific to the model of the drilling machine.

[0026] In addition, in another aspect of the water gushing observation device according to the present invention, A front centralizer and a rear centralizer are respectively mounted at the tip of the guide shell and behind the tip. A push-in tube included in the shaft unit is further provided between the irregular connector and the first check valve. The first check valve is located closer to the face than the front centralizer.

[0027] According to this aspect, by interposing a push-in tube between the irregular connector and the first check valve, the first check valve and the flow path switching adapter can be positioned in front of the front centralizer in the guide shell. In other words, the shaft unit can be installed in the boring hole so that a long member does not protrude from the face, thereby suppressing interference with other face operations.

[0028] Here, the guide shell of the drilling machine generally includes two centralizers (front centralizer and rear centralizer) equipped with hydraulic clamps, which have the function of centering the drilling rod and the like, and the function of gripping the drilling rod and the like with the hydraulic clamps provided in the centralizers. Further, as another form, the front centralizer is equipped with a hydraulic clamp, the rear centralizer is not equipped with a hydraulic clamp, and there is also a form that functions as a fulcrum for preventing buckling of a plurality of long double-tube rods. In this aspect, for example, by using the front centralizer equipped with a hydraulic clamp as a "rotation restraint part that restrains the other part of the shaft-like unit and prevents rotation", a suitable rotation prevention means can be formed using the constituent members of the drilling machine.

[0029] Also, one aspect of the formation and separation method of the water inrush observation device according to the present invention is A water inrush observation device installed in a boring hole provided in a face, taking in water inrush from the tip of the boring hole to conduct water inrush observation, the water inrush observation device including a packer device equipped with a packer, and a double-tube rod attached to one end of the packer device being connected to each other, and further including an axial unit equipped with an observation meter, and a moving device for inserting at least a part of the axial unit into the boring hole and pulling out the axial unit from the boring hole. In the water inrush observation device, the moving device and the axial unit are connected to insert the axial unit into the boring hole to conduct water inrush observation. After the water inrush observation, the axial unit is pulled out from the boring hole, a part of the moving device is separated from the other part of the moving device, and then the moving device is separated from a part of the axial unit to recover the water inrush observation device. The formation and separation method of the water inrush observation device is When forming the axial unit, while inserting the other part of the axial unit into the boring hole, the other part of the axial unit is restrained by a rotation restraint part, and a rotation restraint jig straddles a part of the axial unit and the moving device to irreversibly restrain relative rotation between the two, and the part of the axial unit and the moving device are rotated synchronously to connect a part and the other part of the axial unit to form the axial unit. When separating the shaft unit from the moving device, the other part of the shaft unit is restrained by the rotation restraint part, and a rotation restraint jig is placed across a part of the shaft unit and the moving device to irreversibly restrain the relative rotation between the two. By rotating a part of the shaft unit and the moving device synchronously, a part of the shaft unit is separated from the other part. Then, the rotation restraint jig is removed from a part of the shaft unit and the moving device, a part of the shaft unit is restrained by the rotation restraint part, and the moving device is rotated to separate the moving device from a part of the shaft unit.

[0030] According to this aspect, by applying a rotation restraint jig that irreversibly restrains the relative rotation across a part of the shaft unit and the moving device, and a rotation restraint part that restrains the other part of the shaft unit during the rotation of a part of the shaft unit and the moving device to prevent rotation, when forming the water gushing observation device by connecting the components of the water gushing observation device while rotating them, or when pulling out the components of the water gushing observation device from the boring hole and separating (or cutting) them while rotating to remove the water gushing observation device, a plurality of connection points (or separation points) can be connected (or separated) in a suitable connection order (or separation order). Therefore, when connecting (or separating) a certain connection point (or separation point) while rotating, it is possible to prevent other connection points (or separation points) from rotating or being connected (or separated) in advance.

Effects of the Invention

[0031] According to the water gushing observation device and its forming and separating method of the present invention, it is possible to grasp the state of water gushing in front of the face safely and efficiently without the need for manual installation and recovery of the packer in the boring hole.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5A

Figure 5B

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 8C

Figure 8D

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0033] Hereinafter, a spring water observation device according to an embodiment and a method for forming and separating the same will be described with reference to the accompanying drawings. In the present specification and the drawings, substantially the same components may be denoted by the same reference numerals, and redundant descriptions may be omitted.

[0034] [Spring Water Observation Device According to an Embodiment] First, with reference to FIGS. 1 to 5, an example of a spring water observation device according to an embodiment will be described. Here, FIG. 1 is a perspective view of an example of a drilling machine equipped with a moving device for forming a spring water observation device according to an embodiment, and FIG. 2 is a perspective view of an example of a spring water observation device according to an embodiment. Further, FIG. 3 is an exploded longitudinal sectional view of a packer device, a double pipe rod, a flow path switching adapter equipped with an observation meter, a water pressure measuring device, and a first check valve that constitute a spring water observation device according to an embodiment, and shows both the flow of water in the first flow path and the flow of spring water in the second flow path. FIG. 4 is a view taken along the arrow IV-IV of FIG. 3, and is a view of the arrangement of the first flow path and the second flow path in the flow path switching adapter as seen in cross section. Furthermore, FIG. 5A is an enlarged view of a check valve, and FIG. 5B is an enlarged view in which a socket and a flow path opening valve are attached to the check valve.

[0035] The water gushing observation device and its forming and separating method described below are for grasping the state of water gushing, such as the amount of water gushing and the water gushing pressure in the water gushing area in front of the face, during the construction of a mountain tunnel, and for forming and separating this device. Based on the observation results, it is used to determine the presence or absence of water gushing countermeasures to be implemented in advance during the next tunnel excavation, or to obtain the observation results for considering the impact on the surrounding environment. For example, when a large amount of water gushes out at high pressure during the construction of a mountain tunnel, not only the impact on tunnel construction, such as face collapse, but also the impact on the surrounding environment (ground settlement, groundwater level decline, etc.) can be significant, so necessary countermeasures are essential.

[0036] Regarding the advanced boring holes constructed at the face of the tunnel during water gushing observation, there are ultra-long boring holes with a length of about 1000 m, medium-sized boring holes with a length of about 100 m, and short boring holes with a length of about 30 m. However, any form may be applied to the boring holes constructed during the water gushing observation method according to the embodiment.

[0037] Here, in the water gushing observation using ultra-long boring holes, in addition to the presence or absence of water gushing, the position of the water gushing, etc. are investigated. However, it takes, for example, several months to approach the water gushing zone, and large-scale equipment is required for the investigation.

[0038] On the other hand, in the water gushing observation using medium-sized boring holes or short boring holes, the water gushing pressure and the amount of water gushing can be accurately measured using the packer provided in the water gushing observation device according to the embodiment, and it becomes possible to confirm the water permeability of the ground and predict the amount of water gushing when the face is reached.

[0039] Furthermore, in the water gushing observation using short boring holes, as described below, the water gushing observation can be carried out using a drilling machine permanently stationed at the face. The cost required for the water gushing observation becomes low, the time required for drilling one boring hole is about 1 to 2 hours, and it is possible to quickly drill multiple boring holes.

[0040] From these, the artesian water observation device and its formation separation method according to the embodiment are preferably used for artesian water observation using medium-length boring holes or short-length boring holes, and particularly preferably used for artesian water observation using short-length boring holes. Incidentally, the current method for measuring the artesian water pressure using short-length boring holes only has a method of installing a packer device manually, and as already described, there is room for improvement from the viewpoints of safety and efficiency in the observation construction. Therefore, the artesian water observation device and its formation separation method according to the embodiment described below can be a technology that improves the construction safety and construction efficiency in the artesian water observation construction using short-length boring holes.

[0041] The drilling machine 10 shown in FIG. 1 is a drill jumbo, and includes a carriage 11 having a cabin, a traveling mechanism, a water supply means (not shown) (configured by a water supply pump, a water tank, a water supply pipe, etc.), and a plurality (five in the illustrated example) of booms 12 rotatably mounted in the horizontal X1 direction (around the yaw axis) and the vertical X2 direction (around the pitch axis) in front of the carriage 11. Each boom 12 is extendable and retractable in the X3 direction, which is its axial direction.

[0042] Among the plurality of booms 12, a man cage 13 is rotatably mounted at the tip of the boom 12B, and the workbench of the man cage 13 is always in a horizontal posture in accordance with the turning of the boom 12B.

[0043] On the other hand, a guide shell 14 is mounted at the tip of the other boom 12A, and a drifter 15 is slidably attached to the guide shell 14. A shank rod 16 is attached to the tip of the drifter 15, and water is supplied from a water supply means (not shown) equipped on the carriage 11 to a flow path (not shown) inside the shank rod 16.

[0044] In addition, an annular front centering device 18A is mounted at the tip of the guide shell 14, and an annular rear centering device 18B is mounted behind it. The shank rod 16 is slidably inserted through the interiors of the two centering devices 18A and 18B.

[0045] Here, the front centralizer 18A is provided with a hydraulic clamp, and as will be described below, it serves as a rotation restraint part that grips and restrains a part of the shaft unit during the formation and separation of the shaft unit. On the other hand, the rear centralizer 18B is not provided with a hydraulic clamp and only functions as a fulcrum for preventing buckling of a plurality of long double-tube rods. However, a rear centralizer provided with a hydraulic clamp may also be applied.

[0046] The guide shell 14, the drifter 15, and the shank rod 16 constitute the moving device 17. Here, the drifter 15 can rotate around its axis in addition to sliding on the guide shell 14.

[0047] Also, the guide shell 14 is slidably attached to the tip of the boom 12A.

[0048] As shown in FIG. 2, in order from the face side, a packer device 20 having a packer 26, a double-tube rod 30 attached to the rear end of the packer device 20, a flow path switching adapter 40 attached to the rear end of the double-tube rod 30, a water pressure measuring device 90 attached to the rear end of the flow path switching adapter 40, and a first check valve 50 attached to the rear end of the water pressure measuring device 90 form the shaft unit 60. As shown in FIG. 3, an observation meter 48 is attached to the flow path switching adapter 40 via an introduction pipe 46. Also, depending on the length of the boring hole, a separate double-tube rod may be added as a splicing pipe to the rear end of the double-tube rod 30.

[0049] Here, in the illustrated example, the water pressure measuring device 90 and the first check valve 50 are separate members. However, for example, the water pressure measuring device and the first check valve may be integrally configured and both may be the same member.

[0050] A special-shaped connector 80 is attached to the tip of the shank rod 16 that forms the moving device 17. Here, the special-shaped connector 80 is also a component of the moving device 17.

[0051] A push-in tube 70 is attached to the tip of the deformed connector 80, and the rear end of the first check valve 50 is connected to the tip of the push-in tube 70, thereby forming the water gushing observation device 100. Here, the push-in tube 70 is also a component of the shaft unit 60.

[0052] Since the diameter of the shank rod 16 changes according to the model of the drilling machine 10, by interposing the deformed connector 80, it becomes possible to connect the first check valve 50 according to the diameter of the shank rod 16.

[0053] As will be described in detail below, when inserting the packer device 20 and a part (or all) of the double-tube rod 30, which are part of the shaft unit 60, into the drilling hole formed in the natural ground, the drilling machine 10 is aligned in front of the face, and after the boom 12A is aligned in front of the drilling hole, the drifter 15 slides in the X5 direction along the guide shell 14 constituting the moving device 17, so that the packer device 20 and the double-tube rod 30 are inserted into the drilling hole in the X6 direction.

[0054] In addition, during the construction of the drilling hole, the drilling machine 10 is aligned in front of the face, the boom 12A is aligned in front of the drilling hole cutting position, and after the drilling hole is constructed by a drilling machine (not shown) attached to the shank rod 16, the installation positions of the drilling machine 10 and the boom 12A are held as they are, the drilling machine is removed, the shaft unit 60 shown in the example is attached to the shank rod 16, and the guide shell 14 is slid with respect to the boom 12A whose posture is held, or the drifter 15 is slid with respect to the guide shell 14 to insert and pull out the shaft unit 60 into and from the drilling hole. In a series of operations such as drilling the drilling hole, inserting and installing the shaft unit 60 into the drilling hole, observing the water gushing, and pulling out the shaft unit 60 from the drilling hole, the axial center of the initially set drilling hole and the axial center of the shaft unit 60 are held as they are, and the labor and time required to align the axial centers of both for each operation can be eliminated.

[0055] Water is supplied into the shaft unit 60 through the water supply means provided on the carriage 11, and the water causes the packer 26 of the packer device 20 to expand and press against the hole wall of the boring hole, thereby completing the installation of the shaft unit 60 with respect to the boring hole.

[0056] A part of the sampling tube 22 protrudes from the tip of the packer device 20, and the spring water in the boring hole is taken into the shaft unit 60 through this sampling tube 22.

[0057] The pressure for pressing the hole wall of the boring hole by the packer device 20 is measured by a pressure gauge attached to the water pressure measuring device 90. If the measurement data is lower than a predetermined water pressure, additional water supply can be performed through the water pressure measuring device 90 to further expand the packer 26 and increase the water pressure to the predetermined water pressure (pressing force for pressing the wall surface). Also, when the observation of the spring water is completed and a part of the shaft unit 60 is pulled out and recovered from the boring hole, the packer 26 can be deflated by draining water from the packer device 20 through the water pressure measuring device 90.

[0058] That is, the water pressure measuring device 90 has a plurality of functions such as measuring the pressing force (water pressure) on the wall surface by the packer 26, performing additional water supply to the packer 26 as necessary, and draining the water that has inflated the packer 26 when pulling out and recovering the shaft unit 60.

[0059] Also, a pushing tube 70 for sufficiently inserting the packer device 20 etc. into the boring hole is inserted through the front centralizer 18A and the rear centralizer 18B, so that the first check valve 50, the water pressure measuring device 90, and the flow path switching adapter 40 that form the shaft unit 60 can be positioned closer to the face side than the front centralizer 18A. After a part of the shaft unit 60 is installed in the boring hole, for example, the pushing tube 70 and the special-shaped connector 80 can be separated, and the drilling machine 10 can be used for other purposes.

[0060] Here, a recess 94 is provided on the outer surface of the water pressure measuring device 90, and a check valve 96 is attached to the recess 94. This check valve 96 does not protrude outside the recess 94. Therefore, the check valve 96 can be inserted through the front centering device 18A and the rear centering device 18B even when the check valve 96 is attached to the recess 94.

[0061] In addition, the spring water observation device 100 in the illustrated example is configured to include the guide shell 14 and the drifter 15 provided in the drilling machine 10 as the moving device 17, but may be configured to use a hydraulic cylinder or the like mounted on an aerial work vehicle or the like as the moving device.

[0062] Next, with reference to FIGS. 3 to 5, the specific configuration of each component constituting the shaft unit 60 will be described.

[0063] The packer device 20 is formed by fitting the left and right annular main body pipes 21B and 21C to both ends of the central annular main body pipe 21A. A sealing material 24 such as an O-ring is interposed at the fitting portion between the main body pipe 21A and the left and right main body pipes 21B and 21C, and the main body pipes 21B and 21C are connected to the left and right ends of the main body pipe 21A while being in sliding contact with the sealing material 24.

[0064] The main body pipe 21A is divided into two members on the left and right. A packer attachment opening 21c is provided between the two, and a packer 26 is disposed in the packer attachment opening 21c. The left and right ends of the packer 26 are fitted into the attachment uneven grooves 21d at the ends of the left and right main body pipes 21A and are fixed so as to be slidable. That is, when the packer 26 bulges laterally, the end of the packer 26 is pulled and slides in the attachment uneven groove 21d, but the packer 26 does not come off because it is an uneven groove.

[0065] Sampling pipes 22 are inserted into the main body pipes 21A, 21B, and 21C, and a part of the sampling pipe 22 protrudes from the tip 21a of the main body pipe 21C. A second flow path 23 is provided inside the sampling pipe 22, and the spring water is taken in from the tip of the second flow path 23 in the Y10 direction. The taken-in spring water flows through the second flow path 23 in the Y11 direction and is sent to the double-pipe rod 30.

[0066] An annular first flow path 25 is provided between the main body pipe 21 and the sampling pipe 22. The water sent from the double-pipe rod 30 flows through the first flow path 25 in the Y6 direction and reaches the packer attachment opening 21c. By pressing the inner side surface of the packer 26 laterally, the packer 26 bulges in the Y7 direction. When the laterally bulged packer 26 presses the hole wall of the drilling hole with a predetermined pressing force, it becomes possible to maintain the installation posture of the axial unit 60 in the drilling hole even under the spring water pressure received from the spring water. In addition, when the spring water pressure is too large, the moving device 17 of the drilling machine 10 may be left attached to the axial unit 60, and the installation posture of the axial unit 60 in the drilling hole may be maintained.

[0067] The tip 31a of the outer pipe 31 constituting the double-pipe rod 30 is fitted to the rear end 21b of the main body pipe 21B.

[0068] The double-pipe rod 30 has an outer pipe 31 and an inner pipe 32. An annular first flow path 35 is provided between the two and communicates with the first flow path 25 of the packer device 20. In addition, a second flow path 33 is provided inside the inner pipe 32 and communicates with the second flow path 23 of the packer device 20.

[0069] A sealing material 34 made of an O-ring is provided on the tip side of the outer pipe 31. The rear end 21b of the packer device 20 is fitted to the tip 31a of the outer pipe 31, and the connection between the two is made while being in sliding contact with the sealing material 34.

[0070] The spring water flowing through the second flow path 23 of the packer device 20 flows into the second flow path 33 of the inner pipe 32 in the Y12 direction and flows through the second flow path 33 in the Y13 direction. On the other hand, the water sent from the flow path switching adapter 40 flows through the first flow path 35 in the Y5 direction and is sent to the first flow path 25 of the packer device 20.

[0071] The tip 41a of the main body pipe 41 constituting the flow path switching adapter 40 is fitted to the rear end 31b of the outer pipe 31. Here, although not shown, when another double pipe rod is additionally connected to the double pipe rod 30 as an extension pipe, the tip of the extension pipe is connected to the rear end 31b of the double pipe rod 30 shown in the figure.

[0072] The flow path switching adapter 40 has a main body pipe 41. As shown in FIGS. 3 and 4, a second flow path 43 is provided in the center of the main body pipe 41, and a plurality (seven in the illustrated example) of first flow paths 45 are provided around it. The second flow path 43 communicates with the second flow path 33 of the double pipe rod 30, and the plurality of first flow paths 45 communicate with the annular first flow path 35 of the double pipe rod 30.

[0073] A sealing material 44 made of an O-ring is provided on the tip side of the main body pipe 41. The rear end 31b of the double pipe rod 30 is fitted to the tip 41a of the main body pipe 41, and the connection between the two is made while being in sliding contact with the sealing material 44.

[0074] In the main body pipe 41, the second flow path 43 bends at its end to form an attachment port 43a facing a part of the side surface of the main body pipe 41. One end of an introduction pipe 46 is attached to this attachment port 43a, and an observation meter 48 is attached to the other end of the introduction pipe 46.

[0075] The water gushing in through the second flow path 33 of the double pipe rod 30 into the second flow path 43 flows through the second flow path 43 in the Y14 direction, is introduced into the introduction pipe 46 in the Y15 direction, and then reaches the observation meter 48. The observation meter 48 is a pressure gauge for measuring the water gushing pressure, a flow meter for measuring the water gushing volume, etc., and physical quantities such as the water gushing pressure and the water gushing volume of the incoming water gushing are measured. Also, although not shown in the figure, for example, a water gushing outlet may be provided in the middle of the introduction pipe 46 so that the water gushing is discharged and the water quality including its turbidity can be visually recognized.

[0076] When the observation meter 48 is equipped with a communication means (not shown), the observation data is transmitted in real time to a mobile terminal in the operator's cabin of the drilling machine 10 or a computer in the management facility outside the tunnel pit through the communication means.

[0077] On the other hand, the water sent from the water pressure measuring device 90 flows into a plurality of first flow paths 45 in the main body pipe 41, flows through each first flow path 45 in the Y4 direction, and is sent to the first flow path 35 of the double pipe rod 30.

[0078] The tip 91a of the main body pipe 91 constituting the water pressure measuring device 90 is fitted to the rear end 41b of the flow path switching adapter 40.

[0079] The water pressure measuring device 90 has a main body pipe 91. A sealing material 95 made of an O-ring is provided on the tip side of the main body pipe 91. The rear end 41b of the flow path switching adapter 40 is fitted to the tip 91a of the main body pipe 91, and the connection between the two is made while slidingly contacting the sealing material 95.

[0080] The water pressure measuring device 90 includes a main flow path 92 forming a first flow path and a branch flow path 93 branched from the main flow path 92 inside the main body pipe 91. Among the outer surfaces of the main body pipe 91, a recess 94 is provided at a position corresponding to the branch flow path 93, and the opening 93a of the branch flow path 93 faces the recess 94.

[0081] As shown in FIG. 3, a check valve 96 is attached to the opening 93a. Here, the depth of the recess 94 is t1, and the height t2 of the check valve 96 is set to be equal to or less than the depth t1. This allows the check valve 96 to be inserted through the opening 93a without interfering with the centralizers 18A and 18B even when the check valve 96 is attached to the opening 93a when the shaft unit 60 is inserted into the boring hole B.

[0082] As shown in FIG. 5A, the check valve 96 attached to the opening 93a of the branch flow path 93 includes a second check valve 96c that is constantly biased by a spring 96e in a direction (upward in the illustrated example) to close the flow path 96b in a flow path 96b that penetrates the valve body 96a. A sealing material 96d made of an O-ring is attached to the outer periphery of the second check valve 96c, and the flow path 96b is closed when the sealing material 96d contacts the wall surface of the flow path 96b.

[0083] When the water pressure measuring device 90 does not measure the water pressure (pressing force against the wall surface) inside the packer 26, does not perform additional water supply to the packer 26, or drain water from the packer 26, but inflates the packer 26 by water supply from a water supply means (not shown), the branch flow path 93 is blocked by the check valve 96, ensuring the liquid tightness of the first flow path of which the main flow path 92 is a component, and water can be supplied to the packer 26 in the Y3 direction.

[0084] On the other hand, when measuring the water pressure inside the packer 26, performing additional water supply to the packer 26, or draining water from the packer 26, as shown in FIG. 5B, a socket 97 is fitted to the check valve 96, and a flow path opening valve 98 is attached to the socket 97 to open the blockage of the flow path 96b of the check valve 96 by the sealing material 96d and cause water to flow in the Y16 direction.

[0085] More specifically, a push pin 98a is attached to the tip of the flow path opening valve 98. When the flow path opening valve 98 is attached to the socket 97, the push pin 98a pushes the second check valve 96c biased by the spring 96e in the Z1 direction against the bias of the spring 96e, causing the second check valve 96c to move in the Z2 direction toward the main flow path 92, opening the flow path 96b of the check valve 96, and fluidly connecting the main flow path 92, the flow path 96b of the check valve 96, the inside of the socket 97, and the inside of the flow path opening valve 98 to each other.

[0086] When measuring the water pressure inside the packer 26, a pressure gauge (not shown) is attached to the flow path opening valve 98. Also, when additional water is supplied to the packer 26, additional water is supplied from a water supply means (not shown) through the flow path opening valve 98. Further, when draining water from the packer 26, the water flowing through the main flow path 92 is drained in the Y16 direction through the flow path opening valve 98.

[0087] The tip 51a of the main body pipe 51 constituting the first check valve 50 is fitted into the rear end 91b of the water pressure measuring device 90.

[0088] The first check valve 50 has a main body pipe 51. A valve seat 52 having a hollow 52b inside is provided at the center of the main body pipe 51, and a first flow path 53 communicating with the opening 52a of the hollow 52b communicates with the tip 51a of the main body pipe 51.

[0089] A sealing material 51c made of an O-ring is provided on the tip side of the main body pipe 51. The rear end 91b of the water pressure measuring device 90 is fitted into the tip 51a of the main body pipe 51, and the two are connected while being in sliding contact with the sealing material 51c.

[0090] On the outer peripheral side of the first flow path 53, a spring 54 is provided, and the rubber ball 55 is urged by the spring 54 to close the opening 52a of the valve seat 52. The first flow path 53 communicates with the hollow 52b of the valve seat 52, and a pushing tube 70 or the like having a hollow is connected to the rear end 51b of the first check valve 50. The water sent from a water supply means (not shown) flows through the hollows of the shank rod 16, the deformed connector 80, and the pushing tube 70 and flows into the first flow path 53 of the first check valve 50 in the Y1 direction.

[0091] When the water pressure of the inflowing water exceeds the biasing force of the spring 54, the rubber ball 55 moves in the Y2 direction and the opening 52a is opened, and the water flows through the opening 52a in the Y2 direction through the first flow path 53 on the side of the water pressure measuring device 90 and flows into the first flow path 92 of the water pressure measuring device 90.

[0092] When the packer 26 is sufficiently inflated in the boring hole and the installation of the shaft unit 60 into the boring hole is completed, the water supply from the water supply means is stopped. Due to this stop of the water supply, the force for pushing out the rubber ball 55 from the rear disappears, and the rubber ball 55 moves by the biasing force of the spring 54 and the opening 52a of the valve seat 52 is closed.

[0093] Since the closing of the opening 52a prevents the return water in the Y17 direction from being drained through the opening 52a, the water filling the first flow path of each member can be held, and the pressing force of the packer 26 that is inflated and pressing the hole wall of the boring hole can be maintained.

[0094] According to the water gushing observation device 100, the moving device 17 is formed by a guide shell 14 or the like pre-equipped on the boom 12A of the drilling machine 10, and further, by using the water supply means pre-provided on the carriage 11 to inflate the packer 26 of the packer device 20, it is not necessary to prepare a moving device and a water supply means peculiar to the water gushing observation device 100.

[0095] In addition, since the shaft unit 60 can be installed in a part of the boring holes by the drilling machine 10 in a continuous manner following the drilling of the boring holes by the drilling machine 10, a series of operations from the drilling of the boring holes to the observation of water inrush can be performed extremely efficiently.

[0096] Furthermore, with the operator on board the drilling machine 10, the shaft unit 60 can be installed in the boring holes, followed by the observation of water inrush, and further, the shaft unit 60 can be recovered from the boring holes after the observation of water inrush. Therefore, it is possible to eliminate the need for manual installation and recovery of the packer in the boring holes and safely grasp the state of water inrush in front of the face.

[0097] [Method for forming and separating a water inrush observation device according to an embodiment] Next, with reference to FIGS. 6 to 13, an example of a method for forming and separating a water inrush observation device according to an embodiment will be described. Here, FIGS. 6, 7, 10 to 13 are process diagrams of an example of a method for forming and separating a water inrush observation device according to an embodiment in order. In the following description, the packer device 20 etc. are inserted into the boring hole B using the moving device 17 of the drilling machine 10 shown in FIG. 1, but the illustration of the carriage 11 etc. of the drilling machine 10 is omitted.

[0098] First, as shown in FIG. 6, a boring hole B is drilled in the face K of a tunnel such as a mountain tunnel formed in the natural ground G by the drilling machine 10 shown in FIG. 1. The advanced boring hole B shown in the figure will be described below as a short boring hole with a length of about 30 m.

[0099] The moving device 17 is composed of the guide shell 14, the drifter 15, and the shank rod 16. An irregular connector 80 is attached to the tip of the shank rod 16, and a double pipe rod 30 and a packer device 20 are sequentially connected to the tip of the irregular connector 80.

[0100] The packer device 20 and the double pipe rod 30 are inserted into the front centralizer 18A and the rear centralizer 18B on the guide shell 14. The double pipe rod 30 and the like are centered while being gripped by these centralizers 18A and 18B and will be inserted into the boring hole B.

[0101] As shown in FIG. 6, by sliding the drifter 15 along the guide shell 14 in the X5 direction toward the face side, the packer device 20 and the double pipe rod 30 are inserted into the boring hole B in the X6 direction in this order.

[0102] Here, when the length of the double pipe rod 30 is shorter than the length of the boring hole B as in the illustrated example, when the double pipe rod 30 is fully inserted into the boring hole B, the drifter 15 is slid to the side opposite to the face to form a gap between the rear end of the double pipe rod 30 and the deformed connector 80. Next, an extension pipe 30A made of a separate double pipe rod is inserted into this gap, and after connecting both ends thereof to the double pipe rod 30 and the deformed connector 80, the drifter 15 is slid again in the X5 direction toward the face side, so that the extension pipe 30A is also inserted into the boring hole B in the X6 direction as shown in FIG. 6.

[0103] For example, for a boring hole B with a length of about 30 m, it is preferable that rods with various lengths such as 0.5 m, 1 m, 1.5 m, and 3 m are prepared for the double pipe rod 30 and the extension pipe 30A.

[0104] When adding the extension pipe 30A, with the centralizer 18A holding the double pipe rod 30, the extension pipe 30A and the non-standard connector 80 inserted behind it can be rotated by the rotational movement of the drifter 15 while connecting (threading) the two. At this time, in order to prevent relative rotation between the non-standard connector 80 and the extension pipe 30A, the non-standard connector 80 and the extension pipe 30A are held and constrained by the rotational restraint jigs 200, 200A shown in FIGS. 8 and 9, and the double pipe rod 30 and the extension pipe 30A are connected by the rotational movement of the drifter 15. The forming method (connection method) and separation method of the members using this rotational restraint jig 200 etc. will be described in detail below.

[0105] At the stage where the extension pipe 30A is inserted to a predetermined position within the boring hole B, the connection between the non-standard connector 80 and the extension pipe 30A is separated, and for the non-standard connector 80, the flow path switching adapter 40, the water pressure measuring device 90, and the pushing pipe 70 are joined to each other, and the end of the pushing pipe 70 in the unit (integrated unit) where each joining part is integrated with an adhesive or imonedi etc. is connected, and the rotational restraint jig 200 is attached so as to straddle both connection parts. Incidentally, in this attachment, the connection part between the non-standard connector 80 and the pushing pipe 70 may also be integrated with an adhesive or imonedi etc.

[0106] Then, as shown in FIG. 7, the end of the extension pipe 30A is constrained by the front centralizer 18A which is a rotational restraint part, and by the rotational movement of the drifter 15, the integrated unit from the non-standard connector 80 to the flow path switching adapter 40 is rotated in the Z1 direction, thereby forming the axial unit 60 from the packer device 20 to the pushing pipe 70, and an integrated unit in which the non-standard connector 80 which is a component of the moving device 17 is further connected to the axial unit 60 is formed.

[0107] Here, referring to FIGS. 8 and 9, an example of the rotational restraint jig that restrains relative rotation between the pushing pipe 70 (a part of the axial unit 60) and the non-standard connector 80 (a part of the moving device 17) when forming the axial unit 60 will be described.

[0108] First, FIG. 8A is a developed view of an example of the rotation restraint jig, and FIG. 8B is a view showing a situation where a part of the deformed connector and the push-in tube are installed with respect to an example of the rotation restraint jig. Further, FIG. 8C is a view showing a situation where a part of the deformed connector and the push-in tube are gripped with respect to an example of the rotation restraint jig, and FIG. 8D is a longitudinal sectional view showing the internal structure of one of the half pipes constituting an example of the rotation restraint jig.

[0109] The rotation restraint jig 200 shown in FIG. 8 is a pipe wrench in which two half pipes 210A and 210B are rotatably connected to each other via a rotation shaft 218 and are bolted with a bolt 219 on the opposite side of the rotation shaft 218 in a posture of gripping both the push-in tube 70 of the shaft unit 60 and the deformed connector 80 of the moving device 17.

[0110] At one end 211A of one of the half pipes 210A, two insertion pipes 213A are provided at intervals, and at one end 211B of the other half pipe 210B, an insertion pipe 213B to be inserted between the two insertion pipes 213A is provided. The two half pipes 210A and 210B are connected to each other by inserting a rotation shaft member 218 formed by a bolt into a communication pipe formed by the communication of the insertion pipes 213A and 213B.

[0111] Also, at the other end 212A of one of the half pipes 210A, two insertion pipes 214A are provided at intervals, and at the other end 212B of the other half pipe 210B, an insertion pipe 214B to be inserted between the two insertion pipes 214A is provided. When the two half pipes 210A and 210B are closed around the rotation shaft 218 as shown in FIG. 8C, the insertion pipes 214A and 214B communicate to form a communication pipe, and by inserting a fixing shaft member 219 formed by a bolt into the communication pipe, the ends of the deformed connector 80 and the push-in tube 70 are gripped by the rotation restraint jig 200.

[0112] Returning to FIG. 8A, grooves 215A and 215B are provided at positions corresponding to the gripping positions of the deformed connector 80 and the pushing tube 70 in each of the split tubes 210A and 210B, and a chuck piece 216 having a number of convex portions 217 is loosely fitted in each of the grooves 215A and 215B.

[0113] As shown in FIG. 8B, after accommodating the ends of the deformed connector 80 and the pushing tube 70 inside one of the split tubes 210B and rotating the other split tube 210A to form the closed posture shown in FIG. 8C, by rotating and pushing the head of the pushing bolt 220 outside the split tube 210A, the chuck piece 216 is pushed inward by the pushing bolt 220, and a number of convex portions 217 inside the chuck piece 216 clamp and grip the deformed connector 80 and the pushing tube 70.

[0114] Here, as shown in FIG. 8D, a play groove 215a is provided on the side surface of the chuck piece 216. In a state where the tip of the connecting bolt 220A connecting the split tube 210A and the chuck piece 216 is inserted into the play groove 215a, a play margin 215b is provided in the play groove 215a, and the chuck piece 216 is slidable within the range of this play margin 215b.

[0115] On the other hand, the rotation restraint jig 200A shown in FIG. 9 is a double wrench that straddles the gripping positions of both the deformed connector 80 and the pushing tube 70 while surrounding both in a U-shape.

[0116] Inside the opposing pair of side walls 232 of the U-shaped main body 230 forming the rotation restraint jig 200A, chuck pieces 240A and 240B having a number of convex portions 245 are disposed, and the tips of the pushing bolts 250 screwed into the screw grooves 235 provided in the side walls 232 are fixed to the chuck pieces 240A and 240B.

[0117] Furthermore, the gripping positions of both the irregular-shaped connector 80 and the pushing tube 70 are flat gripping surfaces 85, 75 formed by surface cutting. The irregular-shaped connector 80 and the pushing tube 70 are accommodated inside the U-shaped main body 230. When the pushing bolt 250 is pushed in the X12 direction, a number of convex portions 245 of the chuck pieces 240A, 240B clamp and grip each gripping surface 85, 75 in the X13 direction.

[0118] In this way, no matter which of the rotation restraint jigs 200, 200A is applied, smooth and firm gripping of the gripping positions of both the irregular-shaped connector 80 and the pushing tube 70 can be achieved, and smooth removal of the rotation restraint jigs 200, 200A can be realized.

[0119] Note that in the illustrated example, the irregular-shaped connector 80 and the pushing tube 70 are two members gripped by the rotation restraint jigs 200, 200A, but this is an example. Any one kind of the components of the moving device 17 and any one kind of the components of the shaft-like unit 60 can be the two members to be gripped, and two kinds of the components of the shaft-like unit 60 (for example, the double-tube rod 30 and the extension tube 30A, etc.) can be the two members to be gripped.

[0120] After the shaft-like unit 60 is formed in FIG. 7, next, as shown in FIG. 10, after inserting a part of the packer device 20, the double-tube rod 30, and the extension tube 30A (a part of the shaft-like unit 60) into the boring hole B, the packer 26 is inflated in the Y7 direction by water supply from a water supply means (not shown), and the inflated packer 26 presses the hole wall of the boring hole B with a predetermined pressing force, thereby completing the installation of the shaft-like unit 60 in the boring hole B.

[0121] Here, as already described with reference to FIG. 3, in the recess 94 on the outer periphery of the water pressure measuring device 90, since the check valve 96 with an overhanging length below the depth of the recess 94 is attached, when the shaft-like unit 60 is inserted into the boring hole B, the check valve 96 can be inserted without interfering with the centralizers 18A, 18B.

[0122] Next, as shown in FIG. 11, the connection between the push-in tube 70 and the deformed connector 80 is released, and the drilling machine 10 including the moving device 17 retracts. The retracted drilling machine 10 is applied to other uses such as drilling a separate boring hole B.

[0123] In the case of the illustrated example, the assumed water inflow pressure is relatively small, and the installation state of the shaft unit 60 in the boring hole B can be maintained only by the pressing force of the packer 26 against the hole wall of the boring hole B.

[0124] Therefore, for example, in a case where the assumed water inflow pressure is relatively large and the installation state of the shaft unit 60 in the boring hole B cannot be maintained only by the pressing force of the packer 26 against the hole wall of the boring hole B, the drilling machine 10 is made to wait in front of the face K until the water inflow observation is completed, and the shaft unit 60 is held from the rear by the drifter 15 and the shank rod 16.

[0125] After installing the device, as shown in FIG. 11, a socket 97 is attached to the check valve 96 attached to the water pressure measuring device 90, a flow path opening valve 98 is attached to the socket 97, a pressure gauge 49 is attached to the flow path opening valve 98, and the pressure gauge 49 observes the pressure in the first flow path and the pressure (pressing force for pressing the wall surface) in the packer 26 that is the same value as this.

[0126] During the water inflow observation, if the measured data (pressing force by the packer 26) is lower than a predetermined water pressure (pressing force capable of holding the shaft unit 60 within the hole wall of the boring hole B), additional water supply is performed via the water pressure measuring device 90 to inflate the packer 26 more and increase the water pressure to the predetermined water pressure, making it possible to maintain the installation posture of the shaft unit 60 with respect to the hole wall of the boring hole B.

[0127] Next, as shown in FIG. 12, an observation instrument 48 is attached to the flow path switching adapter 40 to take in the spring water W oozing out from the drilling hole B and guide it to the observation instrument 48 to observe the spring water pressure and the spring water volume of the spring water W. Here, the observation targets include not only physical quantities such as spring water pressure but also the water quality of the spring water, the groundwater level, and the like.

[0128] The observation data (measurement data) by the observation instrument 48 may be acquired after the shaft unit 60 is recovered. When the observation instrument 48 is equipped with wireless communication means, it is transmitted in real time to a portable terminal in the operator's cabin of the carriage 11 of the drilling machine 10 or a computer in a management facility outside the tunnel pit by wireless communication (the above is the spring water observation process).

[0129] After the spring water observation is completed, as shown in FIG. 13, the drilling machine 10 is brought close, a special-shaped connector 80 is connected to the push-in pipe 70, and the water in which the packer 26 was inflated is drained in the Y17 direction through a flow path opening valve 98 attached to the water pressure measuring device 90, thereby deflating the packer 26 in the Y8 direction.

[0130] Then, by sliding the drifter 15 along the guide shell 14 to the side opposite to the face K, the packer device 20, the double pipe rod 30, etc. are pulled out from the drilling hole B. At this time, in the opposite method to that when forming the shaft unit 60 with reference to FIG. 7, the extension pipe 30A and the flow path switching adapter 40 are separated.

[0131] That is, the end of the extension pipe 30A is restrained by the front centralizer 18A which is a rotation restraint part, the special-shaped connector 80 and the extension pipe 70 are gripped by the rotation restraint jig 200, and the extension pipe 30A and the flow path switching adapter 40 are separated by the rotational movement of the drifter 15.

[0132] Furthermore, the rotation restraint jig 200 is removed from the deformed connector 80 and the extension pipe 70, the extension pipe 70 is restrained by the front centering device 18A, and the deformed connector 80 and the extension pipe 70 are separated by the rotational movement of the drifter 15, thereby separating the shaft unit 60 and separating the shaft unit 60 from the moving device 17.

[0133] According to the formation separation method of the illustrated water gushing observation device, it is possible to grasp the state of water gushing in front of the face safely and efficiently without the need for manual installation and recovery of the packer into the boring hole. In particular, it can be a technology that dramatically improves the construction safety and construction efficiency in water gushing observation construction such as water gushing pressure using a short boring hole.

[0134] In addition, other embodiments in which other components are combined with the configurations described in the above embodiments may be possible, and the present invention is not limited to the configurations shown here. In this regard, it can be changed without departing from the gist of the present invention and can be appropriately determined according to the application form.

Explanation of Signs

[0135] 10: Drilling machine 11: Cart 12, 12A, 12B: Boom 13: Man cage (workbench) 14: Guide shell 15: Drifter 16: Shank rod 17: Moving device 18A: Front centering device (centering device, rotation restraint part) 18B: Rear centering device (centering device) 20: Packer device 21, 21A, 21B, 21C: Main body pipe 21a: Tip 21b: Rear end 21c: Packer attachment opening 21d: Attachment uneven groove 22: Sampling pipe 23: Second flow path 24: Sealing material 25: First flow path 26: Packer 30: Double-tube rod 30A: Double-tube rod (extension pipe) 31: Outer tube 31a: Tip 31b: Rear end 32: Inner tube 33: Second flow path 34: Sealing material 35: First flow path 40: Flow path switching adapter 41: Main body pipe 41a: Tip 41b: Rear end 43: Second flow path 43a: Attachment port 44: Sealing material 45: First flow path 46: Introduction pipe 48: Observation instrument 49: Pressure gauge 50: First check valve 51: Main body pipe 51a: Tip 51b: Rear end 51c: Sealing material 52: Valve seat 52a: Opening 52b: Hollow 53: First flow path 54: Spring 55: Rubber ball 60: Axial unit 70: Pushing-in pipe 75: Gripping surface 80: Special-shaped connector 85: Gripping surface 90: Water pressure measuring device 91: Main body pipe 91a: Tip 91b: Rear end 92: Main flow path (first flow path) 93: Branch flow path 93a: Opening 94: Recess 95: Sealing material 96: Check valve 96a: Valve body 96b: Flow path 96c: Second check valve 96d: Sealing material 96e: Spring 100: Spring water observation device 200: Rotation restraint jig (pipe wrench) 200A: Rotation restraint jig (double wrench) 210A, 210B: Split pipe 211A, 211B, one end 212A, 212B: The other end 213A, 213B, 214A, 214B: Insertion pipe 215A, 215B: Groove 215a: Play groove 215b: Play margin 216: Chuck piece 217: Protrusion 218: Rotating shaft member (rotating shaft) 219: Fixing shaft member 220: Push-in bolt 220A: Connecting bolt 230: U-shaped body 232: Side wall 235: Thread groove 240A, 240B: Chuck piece 245: Protrusion 250: Push-in bolt G: Natural ground B: Boring hole (advanced boring hole) K: Face W: Spring water

Claims

1. A water gushing observation device installed in a boring hole provided in a face, taking in water gushing from the tip of the boring hole and performing water gushing observation, comprising: At least a packer device provided with a packer, and a double pipe rod attached to one end of the packer device are connected to each other, and further comprising a shaft unit provided with an observation meter; A moving device for inserting at least a part of the shaft unit into the boring hole and pulling out the shaft unit from the boring hole; A first flow path provided inside the shaft unit for allowing the supplied water to reach the inner surface of the packer; A second flow path for allowing the water gushing taken in by the packer device to reach the observation meter; A rotation restraint jig that restrains relative rotation between both sides across a part of the shaft unit and the moving device, and further comprising a rotation restraint portion that restrains the other part of the shaft unit during rotation of the part of the shaft unit and the moving device to prevent rotation, characterized in that it is a water gushing observation device.

2. The rotation restraint jig is a pipe wrench in which two half pipes are rotatably connected to each other via a rotation shaft, and are bolted to each other on the opposite side of the rotation shaft in a posture of gripping the gripping positions of both the moving device and the shaft unit. The water gushing observation device according to claim 1, characterized in that in at least one of the half pipes, a chuck piece having a large number of convex portions is provided at a position corresponding to the two gripping positions so as to be able to tighten the gripping position with bolts.

3. The rotation restraint jig is a double wrench that straddles the gripping positions of both the moving device and the shaft unit while surrounding both of them in a U-shape. Inside the opposing pair of side walls forming the U-shape, a chuck piece having a large number of convex portions is provided with bolts so as to be able to tighten the gripping position of the moving device. The water gushing observation device according to claim 1, characterized in that the gripping positions of the double pipe rod and the moving device are flat gripping surfaces.

4. Further comprising a double pipe rod attached to one end of the packer device, a flow path switching adapter attached to one end of the double pipe rod and provided with the observation meter, and a first check valve attached to one end of the flow path switching adapter. The packer device, the double pipe rod, the flow path switching adapter, and the first check valve are interconnected to form the shaft unit. The first check valve opens the first flow path when water is supplied to the packer device and closes the first flow path when the return water returns from the packer device. The water gushing observation device according to claim 1, characterized in that.

5. A water pressure measuring device is interposed between the flow path switching adapter and the first check valve, and the water pressure measuring device also forms the shaft unit. The water pressure measuring device measures at least the water pressure in the first flow path. The first check valve opens the first flow path when water is supplied to the packer device and closes the first flow path when the return water returns from the packer device. The water pressure measuring device includes a main flow path forming the first flow path and a branch flow path branching from the main flow path. A second check valve is interposed in the middle of the branch flow path, and the second check valve closes the branch flow path when water is supplied to the packer device. The water gushing observation device according to claim 4, characterized in that a check valve is attached to the branch flow path and the water pressure in the first flow path is measured.

6. In a drilling machine comprising a carriage, a boom rotatably mounted on the carriage, a guide shell mounted at the tip of the boom, a drifter sliding along the guide shell, a shank rod mounted at the tip of the drifter, and water supply means for supplying water to the shank rod, the drifter and the shank rod form the moving device, the shaft unit is directly or indirectly connected to the shank rod, and water is supplied from the water supply means to the first flow path. The water gushing observation device according to claim 4 or 5, characterized in that.

7. The water gushing observation device according to claim 6, further comprising a deformed connector included in the moving device, interposed between the shank rod and the first check valve.

8. A front centralizer and a rear centralizer are respectively mounted at the tip of the guide shell and behind the tip. A push-in pipe included in the shaft unit is further provided, interposed between the deformed connector and the first check valve. The water gushing observation device according to claim 7, characterized in that the first check valve is located closer to the face than the front centralizer.

9. A water gushing observation device installed in a boring hole provided in a face, taking in water gushing from the tip of the boring hole to conduct water gushing observation, comprising a packer device having a packer, and a double pipe rod attached to one end of the packer device, which are interconnected, and further comprising an axial unit having an observation gauge, and a moving device for inserting at least a part of the axial unit into the boring hole and pulling out the axial unit from the boring hole. In the water gushing observation device, the moving device is connected to the axial unit to insert the axial unit into the boring hole to conduct water gushing observation. After the water gushing observation, the axial unit is pulled out from the boring hole, a part of the moving device is separated from the other part of the moving device, and then the moving device is separated from a part of the axial unit to recover the water gushing observation device. A method for forming and separating a water gushing observation device, wherein When forming the axial unit, while inserting the other part of the axial unit into the boring hole, the other part of the axial unit is restrained by a rotation restraint portion, a rotation restraint jig straddles a part of the axial unit and the moving device to irreversibly restrain relative rotation between the two, and by rotating a part of the axial unit and the moving device synchronously, a part of the axial unit and the other part are connected to form the axial unit. When separating the axial unit from the moving device, the other part of the axial unit is restrained by the rotation restraint portion, the rotation restraint jig straddles a part of the axial unit and the moving device to irreversibly restrain relative rotation between the two, and by rotating a part of the axial unit and the moving device synchronously, a part of the axial unit and the other part are separated. Then, the rotation restraint jig is removed from a part of the axial unit and the moving device, a part of the axial unit is restrained by the rotation restraint portion, and the moving device is rotated to separate the moving device from a part of the axial unit. A method for forming and separating a water gushing observation device, characterized by the above.

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