Ground movement detection device

Abstract

To provide a ground deformation detection device and ground deformation detection method, which allow for detecting a phenomenon involving horizontal movement of the ground in the ground.SOLUTION: A ground deformation detection device 1 according to an embodiment of the present invention comprises, as shown in figures 1 and 2, a housing 2 vertically buried in the ground G and configured to be horizontally deformable in the presence of ground deformation, a cable 3 under tension inserted through the housing 2, and tension detection means 4 for detecting tension fluctuation of the cable 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ground movement detection device. Place In particular, a ground deformation detection device capable of detecting underground ground deformation Place Regarding. [Background technology]

[0002] Landslides, debris flows, and other ground deformations can cause a variety of disasters, so it is important to detect their early signs. When ground deformation occurs, various phenomena occur underground.

[0003] For example, the ground movement measuring device described in Patent Document 1 installs a subsidence element, which is a magnetic generator, in a measurement hole drilled in the ground, installs multiple magnetic sensors on the inner wall of the hole retention pipe, extracts an electrical signal corresponding to the relative displacement between the subsidence element and the magnetic sensor, detects changes in the subsidence element, and detects subsidence and uplift of the ground layer.

[0004] Furthermore, the ground movement detection system described in Patent Document 2 installs a ground movement monitoring device having an IC tag and a vibration detection sensor on the ground surface, receives signals from each ground movement monitoring device using a reading device (IC tag reader), and determines the occurrence of cliff collapses, debris flows, landslides, etc. when a specified vibration is detected. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 3-152420 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-47534 Summary of the Invention [Problem to be solved by the invention]

[0006] When ground deformation such as a landslide or debris flow occurs, it is believed that the ground moves horizontally underground before the ground surface slides. The invention described in Patent Document 1 above can detect vertical ground movement (subsidence and uplift), but cannot detect horizontal underground movement.

[0007] Furthermore, although the invention described in Patent Document 2 can detect vibrations caused by underground ground movements, it is difficult to determine whether the vibrations are causing ground movements such as landslides or debris flows. Also, the installation of a reading device, power source, etc. is expensive.

[0008] The present invention has been devised in view of the above-mentioned problems, and provides a ground movement detection device that can detect the phenomenon of horizontal movement of the ground underground with a simple configuration. Place The purpose is to provide. [Means for solving the problem]

[0009] According to the present invention, a cable conductor is provided which is buried vertically in the ground and is deformable horizontally due to ground deformation, a cable conductor is inserted in a taut state into the cable conductor, and a tension detection means for detecting a change in tension of the cable conductor. The tension detection means comprises a protective box installed on the ground surface, a moving body arranged in the protective box and movable by the tension of the rope, and an output means for outputting the amount of movement of the moving body to the outside, the output means comprising a display board arranged on the surface of the moving body, and an opening formed in the protective box through which a part of the display board can be seen from the outside, the display board being colored differently in the vertical direction, and the change in color of the display board makes it possible to see the fluctuation in the tension of the rope from the opening. A ground movement detection device is provided.

[0010] The cylindrical body may be formed by an assembly of a plurality of stacked short tubes.

[0011] The cord may be connected to an anchor disposed at a lower end of the cylindrical body.

[0012] Only the cord may be inserted inside the cylindrical body. [Effects of the Invention]

[0015] The ground movement detection device according to the present invention PlaceAccording to this, the phenomenon of horizontal movement of the ground can be detected with a simple configuration in which a cylindrical body that can deform horizontally due to ground movement is buried underground and a cable is inserted under tension through the cylindrical body. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a partial cross-sectional view showing the overall configuration of a ground movement detection device according to an embodiment of the present invention. [Figure 2] 2A to 2C are explanatory diagrams showing the operation of the output means shown in FIG. 1, where (A) shows a safety stage, (B) shows a caution stage, and (C) shows a danger stage. [Figure 3] 1A and 1B are explanatory diagrams showing a ground movement detection method according to an embodiment of the present invention, in which (A) shows an initial state and (B) shows a detected state. [Figure 4] 10A and 10B are explanatory diagrams showing a first modified example of the extension force detection means, in which (A) shows the initial state and (B) shows the detection state. [Figure 5] 10A and 10B are explanatory diagrams showing other modified examples of the tension detection means, where (A) shows a second modified example and (B) shows a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 5(B). Fig. 1 is a partial cross-sectional view showing the overall configuration of a ground movement detection device according to one embodiment of the present invention. Fig. 2 is an explanatory diagram showing the operation of the output means shown in Fig. 1, where (A) indicates a safe stage, (B) indicates a caution stage, and (C) indicates a danger stage.

[0018] 1 and 2, a ground movement detection device 1 according to one embodiment of the present invention includes a cylindrical body 2 that is buried vertically in the ground G and is deformable horizontally due to ground movement, a rope 3 that is inserted under tension into the cylindrical body 2, and tension detection means 4 that detects changes in tension in the rope 3. Note that in Fig. 1, a portion of the middle part of the cylindrical body 2 and the rope 3 is omitted.

[0019] The cylindrical body 2 is formed, for example, by an assembly of a plurality of stacked short pipes 21. The short pipes 21 have a cylindrical shape made of resin and a height of, for example, 10 to 100 cm. The plurality of short pipes 21 are aligned vertically to form one cylindrical body 2 having a length of about several meters to 10 meters. Because the short pipes 21 are stacked at their end faces, they are configured to be easily bendable and move horizontally at the stacked portion when a horizontal force is applied.

[0020] A plate-shaped anchor 22 having a diameter larger than that of the cylindrical body 2 is disposed at the lower end of the cylindrical body 2. The anchor 22 may include an anchor bolt 23 having a ring-shaped portion to which the rope body 3 can be connected.

[0021] The cylindrical body 2 is not limited to the configuration shown in the figure, and may be a single tube. The multiple short pipes 21 may have different heights depending on the depth of the ground G to which they are buried.

[0022] The rope 3 is, for example, a wire rope. The rope 3 may be made of metal or resin as long as it has a predetermined load capacity. The upper end of the rope 3 is connected to the tension detection means 4, the lower end of the rope 3 is connected to the anchor bolt 23, and the middle part of the rope 3 is inserted into the cylindrical body 2 while being kept in a tensioned state.

[0023] The tension detection means 4 includes, for example, a protective box 41 installed on the ground surface, a moving body 42 arranged inside the protective box 41 and movable by the tension of the cable body 3, and an output means 43 that outputs the amount of movement of the moving body 42 to the outside.

[0024] The protective box 41 includes a box body 41a that houses the moving body 42 and legs 41b that are placed underground G. An elastic body 44 is arranged on the inner surface of the upper part of the box body 41a, and generates a resistance force when the moving body 42 is pulled downward by the rope 3. The elastic body 44 is, for example, a spring member. The elastic force of the elastic body 44 can adjust the amount of movement of the moving body 42.

[0025] A guide member may be arranged on the inner side surface of the box body 41a to guide the movement of the moving body 42. The legs 41b may be fixed to a foundation installed underground G.

[0026] The movable body 42 is a box or block that is movably housed in the protective box 41. The output means 43 includes a display board 45 that is arranged on the surface of the movable body 42, and an opening 46 that is formed in the protective box 41 and through which part of the display board 45 can be seen from the outside.

[0027] The display panel 45 is formed so that the colors vary vertically, as shown in Fig. 2(A). For example, the lower section is blue, the middle section is yellow, and the upper section is red. For ease of explanation, the protective box 41 (box) is shown by dotted lines in each of Figs. 2(A) to 2(C).

[0028] 2(A) shows the initial state, a safety stage where there is no horizontal ground movement. At this time, the lower part of the display board 45 is set at the position of the opening 46 so that it can be seen from outside.

[0029] 2(B) shows the caution stage, in which horizontal ground movement begins and the moving body 42 is pulled downward by the tension of the cable 3. At this time, the middle part of the display board 45 is visible from the outside at the position of the opening 46.

[0030] 2(C) shows a danger stage where horizontal ground movement has increased and there is a possibility that ground movement such as a landslide or debris flow may occur in the near future. At this time, the moving body 42 is pulled further downward by the tension of the cable 3, and the upper part of the display board 45 becomes visible from the outside at the position of the opening 46.

[0031] In the present embodiment, the output means 43 is described as displaying the change in tension of the rope 3 by changing colors, but the change in tension of the rope 3 may also be displayed by light or sound.

[0032] Next, a ground movement detection method according to one embodiment of the present invention will be described with reference to Figures 1 to 3(B). Here, Figure 3 is an explanatory diagram showing a ground movement detection method according to one embodiment of the present invention, where (A) shows the initial state and (B) shows the detected state.

[0033] The ground movement detection devices 1 shown in Fig. 1 are installed at predetermined intervals along a slope, for example, as shown in Fig. 3(A). The ground movement detection devices 1 are arranged, for example, linearly from the top to the bottom of the slope. Note that multiple ground movement detection devices 1 may be installed in a distributed manner over a portion of the slope.

[0034] The ground movement detection method according to this embodiment involves installing a cylindrical body 2 that is buried vertically in the ground G and that can deform horizontally due to ground movement, inserting a cable 3 under tension into the cylindrical body 2, and detecting changes in the tension of the cable 3 to detect horizontal ground movement.

[0035] The cylindrical body 2 and the cable body 3 are inserted into a vertical hole excavated in the ground G and buried in the ground G. As shown in Figures 1 and 3(A), in the initial state, the cylindrical body 2 and the cable body 3 are installed in a state in which they extend vertically.

[0036] Thereafter, as the ground moves horizontally, as shown by the arrow in Figure 3(B), the movement of the ground causes the cylindrical body 2 to deform so as to be curved overall. The deformation of the cylindrical body 2 generates tension in the cable 3, and the moving body 42 moves downward, as shown in Figures 2(B) and 2(C). The movement of the moving body 42 causes the color of the display board 45 visible from the opening 46 to change, making it easy to check the level of danger from outside.

[0037] According to the ground movement detection device 1 and ground movement detection method of the present embodiment described above, a cylindrical body 2 that can deform horizontally due to ground movement is buried underground G, and a cable body 3 is inserted under tension into the cylindrical body 2, thereby making it possible to detect the phenomenon of horizontal movement of the ground with a simple configuration.

[0038] Next, modified examples of the tension detection means 4 will be described with reference to Fig. 4(A) to Fig. 5(B). Fig. 4 is an explanatory diagram showing a first modified example of the tension detection means, where (A) shows the initial state and (B) shows the detected state. Fig. 5 is an explanatory diagram showing other modified examples of the tension detection means, where (A) shows a second modified example and (B) shows a third modified example.

[0039] In a first modified example shown in Figures 4(A) and 4(B), the elastic body 44 is configured by a damper. The damper may be a hydraulic damper or an air damper. The output means 43 may be an alarm device that lights up a warning light or sounds an alarm in response to pressure fluctuations in the damper.

[0040] For example, as shown in FIG. 4(B), when the cable 3 is pulled downward due to horizontal movement of the ground, the moving body 42 moves downward, and when a predetermined pressure is generated in the damper, the output means 43 is activated.

[0041] 5(A) and 5(B) is a modification in which the output means 43 is configured to be able to communicate with the main body of the tension detection means 4, and the output means 43 is installed in a location away from the main body of the tension detection means 4. The output means 43 may be a warning light or an alarm device, or may be a display or monitor that displays fluctuations in the tension of the rope body 3 on a screen.

[0042] In the second modified example shown in Fig. 5(A), for example, the output means 43 is placed near the road R. By separating the output means 43 from the main body, it is possible to easily notify people of horizontal movement of the ground even if a place where people may be present is far from the slope.

[0043] 5(B), the output means 43 is configured by a mobile terminal such as a personal computer or smartphone within the facility. In this case, the output means 43 is connected to the main body via a repeater 47 such as a radar or an artificial satellite, since the output means 43 may be installed in a location away from the main body of the tension detection means 4 or may be mobile.

[0044] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0045] 1. Ground movement detection device 2 cylinders 3 Chord body 4. Tension detection means 21 Short tube 22 Anchor 23 Anchor bolt 41 Protective box 41a Box body 41b Legs 42 Mobile 43 Output Method 44 Elastic Body 45 Display board 46 Opening 47 Repeater G underground R road

Claims

1. a cylindrical body that is buried vertically in the ground and is capable of deforming horizontally due to ground movement; A cord that is inserted in a tensioned state into the cylindrical body; and a tension detection means for detecting a change in tension of the rope body, the tension detection means comprises a protective box installed on the ground surface, a movable body disposed in the protective box and movable by the tension of the rope body, and an output means for outputting the amount of movement of the movable body to the outside, the output means includes a display board disposed on a surface of the moving body, and an opening formed in the protective box through which a part of the display board can be seen from the outside, The display plate is colored differently in the vertical direction, and the change in the color of the display plate makes it possible to visually recognize the change in tension of the rope body through the opening. A ground movement detection device characterized by:

2. The ground movement detection device according to claim 1 , wherein the cylindrical body is formed by an assembly of a plurality of stacked short pipes.

3. The ground movement detection device according to claim 1 , wherein the cable is connected to an anchor disposed at a lower end of the cylindrical body.

4. A ground movement detection device as described in Claim 1, in which only the cable body is inserted inside the cylindrical body.

Images