Spring water observation device, and spring water observation method

Abstract

To propose a spring water observation device and a spring water observation method capable of efficiently grasping a state of spring water ahead of a pit face without stationing a person near the pit face.SOLUTION: A spring water observation device 1 comprises a rod 2 for observing spring water that is inserted into a borehole BH, a moving device 3 that is connected to the rod 2 and moves the rod 2 in an axial direction, laser emitting means 4 provided on the rod 2, and a target 5 provided in the moving device 3. The moving device 3 is attachable to and detachable from the rod 2. The laser emitting means 4 and the target 5 are provided so that the moving device 3 is positioned when laser light L emitted from the laser emitting means 4 is aimed at the target 5 when the moving device 3 is attached to the rod 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a spring water observation device and a spring water observation method used to measure spring water in tunnel construction. [Background technology]

[0002] In tunnel construction, it is important to understand the geology ahead of the tunnel face and the condition of the spring water area in advance in order to ensure the stability of the ground and to manage the safety of the construction. Advance drilling (for example, horizontal survey drilling) may be carried out as a method of investigating the geology ahead of the tunnel face and the groundwater conditions (hydraulic characteristics, etc.). When observing groundwater conditions by advanced drilling, a packer is inserted into the spring water section at the tip of the borehole, and the packer is expanded to separate it from other sections, and the water pressure of the spring water is measured in the spring water section separated by the packer. When placing a packer at the tip of the borehole, it is common to insert other rods into the borehole while connecting them to the rod with the packer, but this work may be done manually. However, when inserting and retrieving packers manually, it is necessary for workers to enter directly under the face, so great care must be taken to ensure safety. Also, when observing groundwater conditions using boreholes located at high altitudes, such as near the top of the face, it is necessary to secure footing for workers, which is time-consuming.

[0003] Here, Patent Document 1 discloses a construction method using a drill jumbo. With this method, there is no need for people to enter directly below the face, and work can be done at high altitudes. In addition, the work of inserting and extracting the rod is also done by machine, so the workload is smaller than with human labor. The investigation of the water inflow situation ahead of the drilling face may take a long time, from several days to a month. In this case, the drill jumbo and the packer unit are detached to carry out work at other drilling faces, and after the measurement is completed, the drill jumbo and the packer unit are reconnected and retrieved. When retrieving the packer, the guide shell of the drill jumbo must be positioned at the mouth of the packer device, but this alignment work must be carried out based on signals from a watchman positioned near the face. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-274562 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide a spring water observation device and a spring water observation method that can efficiently grasp the state of spring water ahead of the tunnel face without having to station personnel near the tunnel face. [Means for solving the problem]

[0006] The spring water observation device of the present invention for solving the above problem comprises a spring water observation rod inserted into a borehole, a moving device connected to the rod and moving the rod in the axial direction, a laser emitting means provided on one of the rod and the moving device, and a target provided on the other of the rod and the moving device. The moving device is detachable from the rod, and the laser emitting means and the target are provided so that when the moving device is attached to the rod, the laser light emitted from the laser emitting means is aligned with the target, and the alignment of the moving device is completed. The rod is composed of a packer device equipped with a packer, and a double tube rod connected to the base end side (hole mouth side) of the packer device.

[0007] The spring water observation method of the present invention using the spring water observation device includes a rod insertion step of inserting the rod into the borehole by pushing the rod with the moving device, a spring water observation step of observing the spring water in the borehole using the rod installed in the borehole, and a rod recovery step of recovering the rod from the borehole by pulling out the rod with the moving device. In the spring water observation step, the spring water is observed with the moving device detached from the rod. In the rod recovery step, the laser light is aligned with the target to position the moving device, the moving device is connected to the rod, and the rod is pulled out of the borehole by the moving device.

[0008] According to the spring water observation device and spring water observation method, the positioning of the moving device with respect to the rod is completed by aligning the laser light of the laser emitting means provided on the moving device or the rod with the target, so that when the moving device is attached to the rod, the operator of the moving device alone can perform the rod retrieval process. Also, since the moving device is used to insert and retrieve the rod, the labor required for the work can be reduced compared to manual labor.

[0009] More accurate alignment can be achieved by using multiple coaxial targets, preferably fixed to a moving device and the laser emitting means fixed to the observation rod protruding from the borehole. In addition, the moving device may include a guide shell attached to the boom of a heavy machine (e.g., a drill jumbo), a drifter that slides along the guide shell, and a shank rod that is attached to the tip of the drifter and can be connected to the rod. Furthermore, if the laser emitting means is provided with a level, the horizontality of the laser light can be ensured, and any deviation during alignment can be adjusted more accurately. Effect of the Invention

[0010] According to the spring water observation device and spring water observation method of the present invention, the rod retrieval process can be carried out by the operator of the mobile device alone, and ultimately, it becomes possible to efficiently grasp the state of the spring water in front of the face. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a side view showing an overview of a spring water observation device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing a rod and a moving device. [Diagram 3] FIG. 1 is a perspective view showing an overview of a heavy machine. [Figure 4] FIG. 2 is a diagram showing a laser emitting means, where (a) is a front view and (b) is a side view. [Diagram 5] FIG. 4 is a perspective view showing the positional relationship between a target and a guide shell. [Figure 6] 1 is a flowchart showing the steps of a spring water observation method. [Figure 7] FIG. 11 is a cross-sectional view showing a rod insertion process. [Figure 8] FIG. 11 is a cross-sectional view showing the spring water observation process. [Figure 9] FIG. 9 is a cross-sectional view showing the spring water observation process following FIG. 8. [Figure 10] FIG. 11 is a cross-sectional view showing a rod recovery step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] In this embodiment, a case where the spring water condition ahead of the face is observed during tunnel construction will be described. The spring water observation is performed using a spring water observation device 1. FIG. 1 shows an overview of the spring water observation device 1. As shown in FIG. 1, the spring water observation device 1 includes a spring water observation rod 2, a moving device 3, a laser emission means 4, and a target 5. The rod 2 is inserted into a borehole BH formed from the face toward the front. Spring water observation is performed by measuring the spring water pressure and spring water volume in the spring water section via the rod 2 that has reached the spring water section. The spring water observation rod 2 is positioned so that it has reached the spring water section, left in place for a certain period of time for spring water observation, and then retrieved after the observation. The insertion of the rod 2 into the borehole BH and the retrieval of the rod 2 from the borehole are performed by a moving device 3. The rod 2 is shown in Fig. 2. As shown in Fig. 2, the rod 2 is composed of, in order from the tip, a packer device 21 equipped with a packer 22, a double-tube rod 23 attached to the rear end of the packer device 21, a flow path switching adapter 24 attached to the rear end of the double-tube rod 23, a water pressure measuring device 25 attached to the rear end of the flow path switching adapter 24, and a check valve 26 attached to the rear end of the water pressure measuring device 25. A plurality of double-tube rods 23 are connected according to the length of the borehole BH. The water pressure measuring device 25 and the check valve 26 may be integrally configured.

[0013] The moving device 3 is detachable from the rod 2, and moves the attached rod 2 in the axial direction. The moving device 3 in this embodiment is provided on a drill jumbo (heavy machinery) 6. An overview of the drill jumbo 6 is shown in FIG. As shown in Fig. 3, the drill jumbo 6 has a cart 61 equipped with a cabin, a traveling mechanism, etc., and multiple booms 62 (five in this embodiment) attached to the cart 61 so as to be freely rotatable in the horizontal and vertical directions. Each boom 62 is freely extendable and retractable in its axial direction. A man cage 63 is attached to the tip of some of the multiple booms 62 (two in this embodiment). The man cage 63 is freely rotatable relative to the boom 62, and it is possible to maintain the horizontal position of the work platform (bottom plate) of the man cage 63 even when the boom 62 is rotated. On the other hand, a guide shell 64 is attached to the tip of the other boom 62 among the multiple booms 62. The guide shell 64 constitutes a part of the moving device 3. As shown in FIG.

[0014] The drifter 31 is slidably attached to the guide shell 64. Here, the drifter 31 can rotate around the axis of the guide shell 16 in addition to sliding on the guide shell 64. A shank rod 32 is attached to the tip of the drifter 31. The shank rod 32 can be connected to the rod 2 (check valve 26). The axis of the shank rod 32 is parallel to the axis of the guide shell 64. The shank rod 32 is connected to the rod 2 in a state where it is coaxial with the rod 2. In addition, the shank rod 32 can rotate around its axis. The guide shell 64 has two annular centralizers 65 attached at two positions spaced apart, and the shank rod 32 is inserted through the two centralizers 65, 65 in a slidable manner.

[0015] As shown in FIG. 1, the laser emitting means 4 is fixed to the base end of the rod 2 (the portion protruding from the borehole BH). FIG. 4 shows the laser emitting means 4. As shown in FIGS. 4(a) and 4(b), the laser emitting means 4 includes a light emitting means body 41, an attachment means 42, and a level 43. The attachment means 42 includes a stand 44 to which the light emitting means body 41 is attached, a gripping portion 45 for gripping the rod 2, and a support 46 for connecting the stand 44 and the gripping portion 45. The level 43 is fixed to the stand 44. As shown in FIG. 1, the laser emitting means 4 is fixed to the rod 2 via the attachment means 42 so that it has a predetermined distance from the central axis of the rod 2 and can emit laser light L parallel to the central axis of the rod 2.

[0016] As shown in FIG. 1, the target 5 is provided on the guide shell 64. In this embodiment, the two targets 5, 5 are provided on the same axis parallel to the axis of the guide shell 64 with respect to the moving device 3 (guide shell 64). That is, the line connecting the centers of the two targets 5, 5 is parallel to the axis of the guide shell 64 (shank rod 32). The distance between the center of the target 5 and the central axis of the shank rod 32 is the same as the distance between the laser light L emitted from the laser emission means 4 and the central axis of the rod 2. That is, the laser emission means 4 and the target 5 are provided so that the moving device 3 (shank rod 32) is positioned when the laser light L irradiated from the laser emission means 4 is aligned with the target 5, 5 when the moving device 3 (shank rod 32) is attached to the rod 2. At least the target 5 on the tip side (laser emission means 4 side) of the guide shell 64 out of the two targets 5, 5 is made of a material that can transmit the laser light L.

[0017] FIG. 5 shows the target 5. As shown in FIG. 5, the target 5 includes a target body 51, a fixed part 52 fixed to a guide shell 64, and a connecting part 53 connecting the target body 51 and the fixed part 52. The fixed part 52 is fixed to a side surface of the guide shell 64. The connecting part 53 is rotatably attached to the fixed part 52. Therefore, when the rod 2 is extended when inserting the rod 2 into the borehole BH, the target body 51 can be retracted to the side when the double-tube rod 23 is attached to the base end of the rod 2, and the target 5 can be prevented from getting in the way when the extension double-tube rod 23 is placed on the guide shell 64.

[0018] The spring water observation method using the spring water observation device will be described below. The steps of the spring water observation method are shown in Figure 6. As shown in Figure 6, the spring water observation method includes a hole drilling process S1, a rod insertion process S2, a spring water observation process S3, and a rod recovery process S4. In the drilling step S1, a borehole BH is drilled into the face K. The borehole BH is drilled by a drill jumbo 6. When drilling the borehole BH, a drilling rod (not shown) with a drilling bit at its tip is attached to a drifter 31, and the drilling rod is rotated by the moving device 3 and pressed toward the face K.

[0019] In the rod insertion step S2, the rod 2 is inserted into the borehole BH by pushing the rod 2 with the moving device 3. The rod insertion step S2 is shown in Figure 7. As shown in Figure 7, first, the rod 2 is attached to the tip of the shank rod 32. The rod 2 including the packer device 21 and the double tube rod 23 is inserted into two centralizers 65, 65 spaced apart on the guide shell 64, and the double tube rod 23 etc. are gripped and centered by these centralizers 65, 65 and inserted into the borehole BH. Next, the drifter 31 is slid along the guide shell 64 toward the face K, thereby inserting the packer device 21 and the double tube rod 23 in that order into the borehole BH.

[0020] Here, if the rod 2 is short for the depth of the borehole BH, when the double-tube rod 23 has been inserted into the borehole BH, the shank rod 32 is removed from the rod 2, and the drifter 31 is slid away from the face K to form a gap between the rear end of the double-tube rod 30 and the flow path switching adapter 24. Next, a separate double-tube rod 23 is inserted into this gap, connected to the rod 2, and the rod 2 extended by the drifter 31 is pushed into the borehole BH. The extension of the double-tube rod 23 is performed by rotating the shank rod 32 of the extension double-tube rod 23 inserted behind it by rotating the drifter 31 while the existing rod 2 (double-tube rod 23) is held by the centralizers 65, 65, and screwing the double-tube rods 23, 23 together.

[0021] In the spring water observation step S3, the rod 2 installed in the borehole BH is used to observe the spring water in the borehole BH. Figures 8 and 9 show the spring water observation step S3. As shown in Figure 8, the packer 22 is inflated by water supplied from a water supply means (not shown), and the inflated packer 22 presses against the wall of the borehole BH with a predetermined pressing force, thereby fixing the rod 2 to the borehole BH. Next, the moving device 3 (shank rod 32) is disconnected from the rod 2, and the drill jumbo 6 including the moving device 3 is retracted. The retracted drill jumbo 6 is used for another purpose, such as drilling a separate borehole BH. Next, as shown in Fig. 9, an observation meter 27 is attached to the water pressure measuring device 25, and the spring water W that seeps into the borehole BH is taken in from the tip of the rod 2 and guided to the observation meter 27 to observe the spring water pressure and spring water volume of the spring water W. Here, the objects of observation include not only physical quantities such as the spring water pressure, but also the spring water quality and groundwater level.

[0022] In the rod retrieval step S4, the rod 2 is retrieved from the borehole BH by pulling out the rod 2 using the moving device 3. Figure 10 shows the rod retrieval step S4. First, the laser emitting means 4 is fixed to the base end of the rod 2, and the targets 5, 5 attached to the guide shell 64 are erected (see Figure 1). Next, the drill jumbo 6 is operated to move the moving device 3 closer to the base end of the rod 2. Then, the drill jumbo 6 is operated to position the moving device 3 so that the laser light L irradiated from the laser emitting means 4 is aimed at the targets 5, 5. After the positioning of the moving device 3 is completed, the moving device 3 is connected to the rod 2 as shown in Fig. 10. Next, the water that has been inflating the packer 22 is drained, and the packer 22 is deflated. Next, the drifter 31 is slid along the guide shell 64 to the side opposite the face K, thereby withdrawing and recovering the rod 2 from the borehole BH.

[0023] According to the spring water observation device 1 and spring water observation method of this embodiment, it is possible to safely and efficiently grasp the state of the spring water in front of the face K without the need to manually install and retrieve the packer 22 in the borehole BH, and this can be a technology that dramatically improves construction safety and efficiency, especially in spring water observation construction such as spring water pressure using short boreholes. Furthermore, since the alignment of the moving device 3 with respect to the rod 2 is completed by aligning the laser light L of the laser emission means 4 provided on the moving device 3 or the rod 2 with the targets 5, 5, when attaching the moving device 3 to the rod 2 in the rod retrieval process S4, the operator of the drill jumbo 6 (moving device 3) can perform the work alone. Since a plurality of targets 5, 5 arranged on the same axis are used, the positioning of the moving device 3 can be performed more accurately. Furthermore, since the laser emitting means 4 is provided with a level 43, the horizontality of the laser light L can be ensured, and any deviation during alignment can be adjusted more accurately.

[0024] Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and each of the above-described components can be appropriately modified without departing from the spirit of the present invention. The heavy machinery to which the moving device 3 is attached is not limited to the drill jumbo 6. Furthermore, the number of booms 62 of the drill jumbo 6 is not limited. In the above embodiment, the laser emitting means 4 is attached to the base end of the rod 2 and the target 5 is attached to the moving device 3, but the laser emitting means 4 may be attached to the moving device 3 and the target 5 may be attached to the rod 2. The number of targets 5 is not limited to two and may be determined appropriately. The level 43 may be installed as required. [Explanation of symbols]

[0025] 1. Spring water observation device 2 Rod 21 Packer equipment 22 Packer 23 Double tube rod 3. Mobility Devices 31 Drifter 32 Shank Rod 4 Laser emission means 43 Level 5. Target 6 Drill Jumbo (heavy machinery) 62 Boom 64 Guide Shell BH borehole K Face L Laser light

Claims

1. A rod for observing spring water that is inserted into the borehole; A moving device connected to the rod for axially moving the rod; a laser emitting means provided on either the rod or the moving device; A spring water observation device comprising: a target provided on the other of the rod and the moving device, The moving device is detachable from the rod, A spring water observation device, characterized in that the laser emitting means and the target are provided so that the position of the moving device is determined by aligning the laser light emitted from the laser emitting means with the target when the moving device is attached to the rod.

2. A plurality of targets are provided on the moving device along a coaxial line, 2. The spring water observation device according to claim 1, wherein the laser emitting means is fixed to a portion of the rod protruding from the borehole.

3. The moving device includes a guide shell attached to a boom of a heavy machine; A drifter that slides along the guide shell; A shank rod attached to the tip of the drifter, The spring water observation device according to claim 1 , characterized in that the shank rod is connectable to the rod.

4. 2. The spring water observation device according to claim 1, wherein the laser emitting means is provided with a spirit level.

5. A spring water observation method using the spring water observation device according to any one of claims 1 to 4, a rod inserting step of inserting the rod into the borehole by pushing the rod with the moving device; A spring water observation process for observing spring water in the borehole using the rod installed in the borehole; and a rod recovery step of recovering the rod from the borehole by drawing out the rod with the moving device, In the spring water observation step, the spring water is observed in a state in which the moving device is detached from the rod, This is a spring water observation method, characterized in that the rod retrieval process includes the steps of positioning the mobile device by aligning the laser light with the target, connecting the mobile device to the rod, and pulling the rod out of the borehole using the mobile device.

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