JP2980845B2 - Measuring method and measuring device for landslide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a landslide and a measuring device used for the method.

[0002]

2. Description of the Related Art At present, the most commonly used landslide measurement method is shown in FIG. The measuring method shown in this figure measures a landslide as described below, for example, as described in JP-A-6-109471.
A measurement hole 1 is drilled linearly in the ground. In the measurement hole 1,
The guide tube 2 that can be deformed together with the landslide underground is inserted. When a landslide occurs, the guide tube 2 is deformed. The inclinometer 3 is suspended from the guide tube 2 and the inclination angle of the guide tube 2 is measured.

In the measurement method shown in this figure, when the landslide is increased and the guide tube is locally deformed with a small radius of curvature, it becomes impossible to insert an inclinometer. Increasing the gap between the inclinometer and the guide tube can reduce this adverse effect. That is, the wider the gap, the more the inclinometer can be inserted into the guide tube bent with a small radius of curvature. However, the wider the gap between the inclinometer and the guide tube, the worse the accuracy with which the deformation of the guide tube can be measured. This is because if the gap is wide, the inclinometer will not accurately incline along the guide tube. Enhancing the measurement accuracy and reducing the minimum radius of curvature of the guide tube that can be measured are synergistic properties.
Therefore, the measuring method shown in this figure has a disadvantage that it is difficult to measure a landslide having a large displacement amount with high accuracy.

A method for measuring a landslide without using an inclinometer is described in Japanese Patent Application Laid-Open No. 2-52222.
According to the method described in this publication, as shown in FIG. 2, an optical fiber 4 is inserted into a measurement hole 1 provided in the ground at regular intervals, and an optical fiber strain sensor 5 is provided in the middle of the optical fiber 4. ing.

[0005]

The measuring method shown in FIG. 2 has a feature that a large landslide can be measured. However, this measuring method requires the use of an expensive measuring device in order to accurately detect a landslide point. This is because the optical fiber is irradiated with a light pulse and the time delay of the reflected light from the optical fiber strain sensor is measured to detect a landslide point. The speed of light is as high as 3 × 10 ⁸ m / sec. For this reason, the method of detecting the delay time of the reflected light and specifying the position requires detecting the delay time of the reflected light that is extremely small to specify the position, and has a disadvantage that it is difficult to specify the landslide position accurately. is there.

Further, in this measuring method, since the landslide is measured by detecting the external pressure with an optical fiber strain sensor, the displacement amount of the landslide in the ground cannot be directly detected. When a landslide occurs, the pressure acting on the optical fiber strain sensor changes. However, the pressure acting on the optical fiber strain sensor is a parameter for detecting the amount of landslide displacement. It does not directly detect the amount of landslide displacement.

For this reason, the landslide measuring method and apparatus shown in FIG. 2 require an expensive measuring apparatus,
There is a drawback that it is difficult to accurately detect the displacement amount of the landslide and its occurrence position.

[0008] The present invention has been developed to solve this drawback. An important object of the present invention is to provide a landslide measurement method and a landslide measurement method capable of accurately and easily detecting the position and displacement of a landslide with a very simple structure.

[0009]

According to a first aspect of the present invention, a landslide measuring method measures a landslide as described below to achieve the above object. A measurement hole 1 is provided linearly in the ground, and a shape memory alloy rod 6 is inserted into the measurement hole 1. In this state, the shape memory alloy rod 6 is left standing in the ground. When a landslide occurs, the shape memory alloy rod 6 is deformed. In order to memorize the deformed state, the shape memory alloy rod 6 is energized and heated to the memorized temperature. The heated shape memory alloy rod 6 stores the deformed shape. Thereafter, the shape memory alloy rod 6 is pulled out from the measurement hole 1. When pulled out, the shape memory alloy rod 6 is soft and freely deformable, so that it is stretched in a shape convenient for being pulled out, that is, in a straight line. Measurement hole 1
When heated, the shape memory alloy rod 6 pulled out is recalled to the stored shape. In this state, the shape memory alloy rod 6 is restored to the same shape as that which was put in the landslide. Looking at the shape of the shape memory alloy rod 6, the position and displacement of the landslide can be accurately detected. Furthermore, the measuring method of the present invention, measurement hole 1 inserts a lead wire 9 with the shape memory alloy rods 6, by connecting the lead wire 9 to the lower end of the shape memory alloy rods 6, via a lead wire 9 shaped The memory alloy rod 6 is directly energized and heated to the storage temperature. After heating the shape memory alloy rod 6 to the storage temperature, the lead wire 9 and the shape memory alloy rod 6 are separated, and only the shape memory alloy rod 6 is pulled out while leaving the lead wire 9 in the measurement hole 1. Measurement method according to claim 2 of the present invention, the shape memory alloy rods 6 and a lead wire 9, blown can fuse 14, the elastic contact 13 can pull by energizing the shape memory alloy rods 6, the lower end of the shape memory alloy rods 6 Holder to pinch and fix so that it can be released
Connect with any of 16

Further, in the landslide measuring device according to the third aspect of the present invention, the shape memory alloy rod 6 and the shape memory alloy rod 6 are inserted through the heat insulating material 7,
An outer skin 8 that can be deformed together with the landslide underground and a lower end of the shape memory alloy rod 6
And a lead wire 9 which is energized and heated. Lead wire 9
The shape memory alloy rod 6 is connected so that the shape memory alloy rod 6 can be separated after being heated to the storage temperature. The shape memory alloy rod 6 placed in the outer skin 8 is inserted into the measurement hole 1 provided in the ground. In a state where the outer skin 8 and the shape memory alloy rod 6 are deformed due to the landslide, the shape memory alloy rod 6 is energized through the lead wire 9 and heated to the storage temperature. Is stored. Thereafter, the shape memory alloy rod 6 and the lead wire 9 are separated from each other, and the shape memory alloy rod 6 is pulled out of the measurement hole 1 while leaving the lead wire 9 and heated.

[0011] A landslide measuring device according to claim 4 of the present invention comprises:
The shape memory alloy rods 6 and a lead wire 9, blown can fuse 14, the elastic contact 13 can pull by energizing the shape memory alloy rods 6, and clamped so as to be able to release the lower end of the shape memory alloy rods 6 for fixing It is connected by one of the holders 16 . Further, in the landslide measuring device according to claim 5 of the present invention, the holder 16 can be energized to release the sandwiched state of the shape memory alloy rod 6 .

[0012]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a landslide measuring method and a measuring device for embodying the technical idea of the present invention, and the present invention does not specify the measuring method and the following device.

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”. However, the members described in the claims are not limited to the members of the embodiments.

FIG. 3 and FIG. 4 show the outline of the method for measuring landslide of the present invention. These figures show a method of detecting a landslide occurring at a position indicated by a chain line. In this method, first, as shown in FIG. 3, a measurement hole 1 is provided vertically and linearly in the ground, and a shape memory alloy rod 6 is inserted into the measurement hole 1. For example, Ti-
Ni alloy is used. When a landslide occurs at the position indicated by the chain line, the shape memory alloy rod 6 is deformed into the shape shown in FIG. This is because the shape memory alloy rod 6 is deformed together with the landslide. In order to store the shape in the shape memory alloy rod 6, the shape memory alloy rod 6 is heated to a storage temperature. In order to heat the shape memory alloy rod 6 to the storage temperature, a large current is applied to the shape memory alloy rod 6. To apply a large current, for example, a welding machine (not shown)
Use The welding machine connects the output terminals to the upper and lower ends of the shape memory alloy rod 6 to flow a large current. When a Ti-Ni alloy shape memory alloy rod is heated to about 450 ° C.,
Store the deformed shape.

After the welding machine is separated from the shape memory alloy rod 6 and the shape memory alloy rod 6 is cooled to room temperature, the shape memory alloy rod 6 is pulled out from the measurement hole 1. The shape memory alloy rod 6 pulled out from the measurement hole 1 is pulled and stretched linearly when pulled out from the measurement hole 1. When the shape memory alloy rod 6 pulled out from the measurement hole 1 is immersed in warm water or heated to about 60 ° C. with a drier or the like, the shape memory alloy rod 6 is recalled to the shape to be stored. The shape memory alloy rod 6 recalled to the shape to be memorized restores its shape when buried underground and landslides. In other words, the deformation of the shape memory alloy rod 6 indicates the shape of a landslide underground.

FIG. 5 shows a measuring device used in the above-mentioned method for measuring a landslide. The apparatus shown in FIG. 1 is connected to a shape memory alloy rod 6, an outer skin 8 in which the shape memory alloy rod 6 is inserted via a heat insulating material 7, and a lower end of the shape memory alloy rod 6 to form a shape memory alloy rod. And a lead wire 9 for energizing and heating the rod 6.

For the shape memory alloy rod 6, a Ti-Ni alloy is optimal. The Ti-Ni alloy is excellent in corrosion resistance, can easily memorize the shape, and has high reliability when used repeatedly. Therefore, the Ti-Ni alloy is an optimal shape memory alloy for the application of the present invention. However, the method and apparatus for measuring a landslide of the present invention do not specify a shape memory alloy rod as a Ti-Ni alloy. For example, Cu-Zn
Any material that can be inserted into the ground, energized, memorize the shape and pulled out, such as an Al alloy, can be used.

The shape memory alloy rod 6 is a rod having a circular or non-circular cross-sectional shape. Circular shape memory alloy rods are not directional and cannot determine the direction of the landslide. However, the circular shape memory alloy rod is
As shown in (5), the direction of the landslide can be specified by fixing the direction bar 10 indicating the direction at the upper end. For example, if a shape memory alloy rod is inserted into the ground so that the compass bar faces north, south, east, west, the direction of landslide can be specified. Alternatively, although not shown, the azimuth rod can be fixed to the upper end after inserting the shape memory alloy rod into the ground as a separate member from the shape memory alloy rod. This method has the advantage that when the shape memory alloy rod is inserted into the ground, it is not necessary to specify the direction of the rod, so that the rod can be inserted quickly. Moreover, since the azimuth rod is fixed after insertion, the azimuth can be adjusted more accurately.

Further, the direction of the circular shape memory alloy rod can be specified by drawing a plurality of straight lines in the axial direction at equal intervals on the side surface. For example, assuming that four straight lines are drawn on the side surface of the shape memory alloy rod, this shape memory alloy rod inserts four straight lines toward east, west, north and south,
The direction of the landslide can be specified. Alternatively, the number of straight lines drawn on the side surface may be 8, 12, or 16. In these cases, the direction can be specified more finely. In this way, the shape memory alloy rod with a plurality of straight lines drawn on the side surface can not only easily specify the direction, but also easily detect the torsion of the shape memory alloy rod and furthermore, the distortion. There are features. In order to draw a straight line on the side surface of the shape memory alloy rod, for example, there is a method of applying a paint. This method has a feature that a straight line can be easily displayed and a direction can be distinguished by color coding. Alternatively, the straight line can be indicated by providing a linear projection or groove on the side surface of the shape memory alloy rod.
This method, even if the shape memory alloy rod is buried in the ground for a long time, the surface may be eroded by rain etc.
The feature is that the direction can be detected accurately.

The shape memory alloy rod 6 preferably has a non-circular cross section. Non-circular shape memory alloy rods
The direction of the landslide can be specified without fixing the compass bar. For example, the shape memory alloy rod is prismatic. This shape memory alloy rod is inserted with four sides facing north, south, east, west,
The direction of the landslide can be specified. Further, the shape memory alloy rod has an elliptical cross-sectional shape, and the major axis of the ellipse is inserted in the north-south direction or the east-west direction, whereby the direction of the landslide can be specified. A non-circular shape memory alloy rod can also more accurately detect the direction of the landslide by fixing the compass rod 10 at the upper end as shown in FIG.

The shape memory alloy rod 6 has, for example, a diameter or diagonal length of 1 to 5 mm, optimally about 3 mm.
And Thick shape memory alloy rods can accurately indicate landslides when pulled out of the measurement hole, but are expensive. Although thin shape memory alloy rods can be manufactured at low cost, there is a disadvantage that the strength is reduced when recalled. The thickness of the shape memory alloy rod 6 is designed to an optimum value in consideration of required measurement accuracy and cost.

The outer skin 8 is a pipe that can be deformed together with the landslide underground, for example, a water pipe such as a vinyl chloride pipe or a polyethylene pipe. However, instead of a plastic pipe such as a water pipe, a thin metal pipe that deforms with a landslide can be used for the outer skin. The pipe of the outer cover 8 is formed by inserting one shape memory alloy rod 6 of about 3 mm, and is optimally a metal pipe such as iron having an inner diameter of 16 mm to 50 mm. However, the thickness of the outer skin 8 is determined to be an optimum value in consideration of the thickness and the number of the shape memory alloy rods 6 to be inserted.

The heat insulating material 7 inserted between the outer skin 8 and the shape memory alloy rod 6 insulates the shape memory alloy rod 6 when it is heated, and glass wool, rock wool or silica fiber is optimal. The heat insulating material 7 is densely inserted between the shape memory alloy rod 6 and the outer skin 8 so that the shape memory alloy rod 6 can be pulled out and deforms the shape memory alloy rod 6 into a shape close to the outer skin 8. . Insulation material 7
Wrapped around the surface of the shape memory alloy rod 6, the outer skin 8
Is inserted into the pipe. Instead of glass wool, an inorganic foam that deforms with a landslide can also be used for the heat insulating material. The inorganic foam is formed into a cylindrical shape, and a shape memory alloy rod is inserted through the center. Further, an inorganic powder can be used for the heat insulating material. The powder is filled between the shape memory alloy rod and the outer skin after inserting the shape memory alloy rod into the pipe of the outer skin.

Further, a lead wire 9 is connected to a lower end of the shape memory alloy rod 6 in order to energize the rod and heat it to a memory temperature. The lead wire 9 is housed in the outer skin 8 together with the shape memory alloy rod 6. The lead wire 9 is connected to the lower end of the shape memory alloy rod 6 via a fuse 14. The fuse 14 energizes the shape memory alloy rod 6 from the lead wire 9 when heating the shape memory alloy rod 6 to the storage temperature. Further, a lead wire 15 for heating and fusing the fuse 14 is connected to the upper end of the fuse 14. Before the shape memory alloy rod 6 is pulled out of the outer cover 8, the fuse 14 is energized from the lead wire 15 and the lead wire 9 and blown. Therefore, the fuse 14 is designed not to be blown by a current that heats the shape memory alloy rod 6 to the storage temperature, but to be blown by a current larger than that. The fuse 14 is made of, for example, an aluminum alloy or an alloy of tin and lead.

The measuring device capable of blowing out the fuse 14 and pulling out the shape memory alloy rod 6 from the outer cover 8 can smoothly pull out the shape memory alloy rod 6 from the outer cover 8 and can surely form the lead wire 9 without a contact failure. There is a feature that it can be electrically connected to the memory alloy rod 6.

However, the shape memory alloy rod 6 can be connected to the lead wire 9 via a socket 11 as shown in FIG. The socket 11 is provided with the shape memory alloy rod 6.
And a connecting hole 12 into which the cable can be pulled out.
The connection hole 12 is provided with an elastic contact 13 that is elastically pressed against the surface of the shape memory alloy rod 6. The measuring device having this structure also has a feature that the shape memory alloy rod 6 can be smoothly pulled out from the outer cover 8.

The measuring apparatus having the above-described structure has a structure in which the shape memory alloy rod 6 is pulled out from the outer skin 8 while leaving the lead wire 9. The structure in which the shape memory alloy rod 6 is connected to the lead wire 9 via the socket 11 is suitable for a measuring device in which a plurality of shape memory alloy rods 6 are inserted into the outer cover 8.
This is because, after the shape memory alloy rod 6 is pulled out from the outer skin 8, the shape memory alloy rod 6 remaining on the outer skin 8 can be energized and heated to the storage temperature. In the measuring device having this structure, the socket is provided with a connection hole to which a plurality of shape memory alloy rods can be connected. The measuring device in which a plurality of shape memory alloy rods are inserted into the outer skin can pull out the shape memory alloy rod from the outer skin at regular intervals and measure the landslide over time.

The landslide measuring device shown in FIG. 5 is used as follows. The outer skin 8 in which the shape memory alloy rod 6 and the lead wire 9 are inserted is inserted into the measurement hole 1 which is formed straight in the ground via the heat insulating material 7. The outer skin 8
Turn the compass 10 exactly in the north, south, east and west directions, or
By turning the non-circular shape memory alloy rod 6 in a specific direction,
Insert into the underground measurement hole 1 and fix. When a landslide occurs in this state, the outer skin 8 and the shape memory alloy rod 6 are deformed together with the landslide underground. Shape memory alloy rod 6
In order to memorize the deformation of the shape memory alloy rod 6, a large current is applied to the shape memory alloy rod 6 through the lead wire 9.
Is heated to the stored temperature. The shape memory alloy rod 6 made of a Ti—Ni alloy memorizes a deformable shape when heated to about 450 ° C. A welding machine is most suitable for a device for flowing a large current through the shape memory alloy rod 6. The welding machine can adjust the heating temperature of the shape memory alloy rod 6 by adjusting the current.

After heating the shape memory alloy rod 6 to the storage temperature and storing the shape, a large current is instantaneously applied to the lead wire 15 and the lead wire 9 to blow the fuse 14. Measuring devices without fuses do not require this step.

After cooling the shape memory alloy rod 6 to room temperature, the upper end is clamped, and the shape memory alloy rod 6 is pulled out from the outer skin 8. The shape memory alloy rod 6 is separated from the lead wire 9 by the blown fuse 14 or pulled out from the socket 11, and is quickly pulled out from the outer cover 8. The shape memory alloy rod 6 pulled out from the outer skin 8 is straightened, but is immersed in hot water or heated to about 60 ° C. with a drier to recall the shape to be memorized. The shape memory alloy rod 6 recalled to the shape to be memorized restores its shape when buried underground and landslides. In other words, shape memory alloy rod 6
The deformation of indicates a landslide underground shape.

Further, the measuring device can have the structure shown in FIGS. The measuring device includes a holder 16 for holding and fixing the lower end of the shape memory alloy rod 6.
Are arranged inside the outer skin 8. Holder 16
It comprises a holder body 16A which is two flat plates, a spring 17 connecting these holder bodies 16A at edges, and a notch bolt 19 for fastening the holder body 16A at an edge opposite to the spring 17. .

The holder bodies 16A are arranged in parallel as shown in FIG. These holder bodies 1
6A is connected via a spring 17 at the edge. The spring 17 is formed by spirally winding a metal wire, and the metal wires at both ends are linearly extended. The spring 17 has this linear portion fixed to the opposing surface of the holder body 16A by welding or the like. Spring 17
Are provided on the upper and lower portions of the holder body 16A. These springs 17 are coaxially connected via a spring shaft 18. Two holder bodies 16
A is opened and closed using the spring shaft 18 as a rotation axis.

The holder body 16A is connected at the opposite end by a notch bolt 19. The holder body 16A is provided with a through hole 16a at a position facing the edge. A cylindrical ceramic insulator 20 having a flange 20a at one end is provided in the through hole 16a. The ceramic insulator 20 has a flange 20a
It is inserted into the through-hole 16a so as to be located outside the holder body 16A arranged side by side, and is locked by the flange 20a.
Further, terminal terminals 21 are provided outside the ceramic insulator 20. The terminal terminal 21 is a metal terminal projecting upward from the lower end of the holder body 16A and extending therethrough, and has a through hole at a position facing the through hole 16a of the holder body 16A. The notch bolt 19 is inserted through the through-hole, and after penetrating the terminal insulator 21 and the ceramic insulator 20 disposed at opposing positions, the notch bolt 19 is tightened. Holder body 16A
Are connected by a notch bolt 19 via a terminal terminal 21 and a ceramic insulator 20. In this state,
The holder body 16A is insulated from the terminal terminal 21 and the notch bolt 19. The terminal terminals 21 on both sides are electrically connected by notch bolts 19. The notch bolt 19 has a notch 19 at the center.
a is provided, and when a predetermined temperature is reached by energization, it is designed to be melted at this portion. In addition, 2
Each of the two terminal terminals 21 is connected to the lead wire 15 at the upper end. The lead wire 15 is extended upward and used as a wire 22 for fusing the notch bolt 19.

Further, the holder body 16A is provided with a recess 16b extending vertically in the center of the opposing surface,
The terminal terminal 23 is provided in the recess 16b.
The terminal terminal 23 is a metal terminal that protrudes downward from the upper end of the holder main body 16A and extends, and is fitted into the concave portion 16b of the holder main body 16A. The holder main body 16 </ b> A clamps the shape memory alloy rod 6 via a terminal 23 at the center thereof. The terminal terminal 23 connects the lead wire 9 to the lower end. This lead wire 9 is extended upward and used as a heating wire 24 of the shape memory alloy rod 6. The shape memory alloy rod 6 is energized through this wiring and is heated to the storage temperature.

When the shape memory alloy rod 6 heated to the storage temperature is pulled out, this measuring device
2 to blow the notch bolt 19. The blown notch bolt 19 releases the tightness of the holder body 16A. The holder body 16A includes a spring 17
To release the clamped state of the shape memory alloy rod 6. Therefore, this measuring device has a feature that the shape memory alloy rod 6 heated to the storage temperature can be easily pulled out. Further, in this measuring apparatus, the heating wire 24 of the shape memory alloy rod 6 and the fusing wire 22 for opening the holder 16 are insulated to form a separate circuit. For this reason, there is also a feature that the current supplied to the fusing wiring 22 does not affect the shape memory alloy rod 6 and can be used with confidence.

[0036]

The landslide measuring method and measuring apparatus of the present invention have a feature that the position and displacement of the landslide can be detected accurately and easily with a simple structure. That is, the measuring method and the measuring device of the present invention insert a shape memory alloy rod into a measuring hole provided linearly in the ground, and in a state where the shape memory alloy rod is deformed due to landslide, the shape memory alloy rod is Energize,
This is because the shape deformed by heating to the storage temperature is stored. The shape memory alloy rod in which the shape of the underground is stored is then pulled out of the measurement hole. At this time, the shape memory alloy rod is stretched in a straight line, but is recalled to the stored shape by heating. The shape memory alloy rod restored to the same shape as the landslide underground can accurately detect the position and displacement of the landslide by checking the shape. In particular, the method and apparatus of the present invention are characterized by measuring deformation of a shape memory alloy rod directly embedded in the ground and measuring landslides. There is no need to insert specific instruments into the ground unlike the related art. Therefore, there is a feature that the position and displacement of the landslide can be easily detected accurately and easily at a low cost without using an expensive device, and the landslide having a large displacement can be measured with high accuracy. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional method for measuring a landslide.

FIG. 2 is a sectional view showing another example of a conventional method for measuring a landslide.

FIG. 3 is a cross-sectional view schematically illustrating a method for measuring a landslide according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view schematically illustrating a method for measuring a landslide according to an embodiment of the present invention.

FIG. 5 is a sectional view showing a measuring device used in the method for measuring a landslide according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing another example of the measuring device used in the method for measuring a landslide according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing another example of the measuring device used in the method for measuring a landslide according to the embodiment of the present invention.

FIG. 8 is a horizontal sectional view showing a holder part of the apparatus shown in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Measurement hole 2 ... Guide tube 3 ... Inclinometer 4 ... Optical fiber 5 ... Optical fiber strain sensor 6 ... Shape memory alloy rod 7 ... Insulation material 8 ... Outer skin 9 ... Lead wire 10 ... Azimuth rod 11 ... Socket 12 ... Connection hole 13 ... Elastic contact 14 ... Fuse 15 ... Lead wire 16 ... Holder 16A ... Holder body 16a ... Through hole 16b ... Recess 17 ... Spring 18 ... Spring shaft 19 ... Notch bolt 19a ... Notch 20 ... Ceramic insulator 20a ... Flange 21 ... Terminal terminal 22 ... Wiring for fusing 23 ... Terminal terminal 24 ... Wiring for heating

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takuo Yamagami 1-27 Shimogi, Shinkirai, Kitajima-cho, Itano-gun, Tokushima Prefecture (56) References JP-A-6-26030 (JP, A) JP-A-5- 215541 (JP, A) JP-A-3-93993 (JP, A) JP-A-59-108912 (JP, A) JP-A-7-159249 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01C 7/02 G01D 21/00

Claims (5)

(57) [Claims] 1. A linear measuring hole (1) is provided in the ground, a shape memory alloy rod (6) is inserted into the measuring hole (1), and the shape memory alloy rod (6) is deformed by landslide. In the state, the shape memory alloy rod (6) is energized, heated to the storage temperature to memorize the deformed shape, and then the shape memory alloy rod
In the method for measuring landslides in which (6) is pulled out from the measurement hole (1) and then heated and recalled to the shape memorized, the lead wire (9) is inserted into the measurement hole (1) together with the shape memory alloy rod (6).
Insert the lead wire (9) to the lower end of the shape memory alloy rod (6), and directly energize the shape memory alloy rod (6) through the lead wire (9) to heat it to the memory temperature. And then
Separate the lead wire (9) from the shape memory alloy rod (6), pull out only the shape memory alloy rod (6) while leaving the lead wire (9) in the measurement hole (1), and heat the shape to be memorized. A method for measuring landslides, comprising recalling a landslide. 2. A fuse (14) capable of blowing a shape memory alloy rod (6) and a lead wire (9), and a shape memory alloy rod (6).
Connected to one of the elastic contact (13) that can be pulled out by applying power to the shape memory alloy rod (6) and the holder (16) that clamps and fixes the lower end of the shape memory alloy rod (6) so that it can be released. 2.) The method for measuring a landslide according to claim 1, wherein the lead wire and the shape memory alloy rod are separated after energizing the landslide. 3. A shape memory alloy rod (6), an outer skin (8) into which the shape memory alloy rod (6) is inserted through a heat insulating material (7), and which can be deformed together with a landslide in the ground. A lead wire (9) connected to the lower end of the memory alloy rod (6) and energizing and heating the shape memory alloy rod (6) is provided.The lead wire (9) and the shape memory alloy rod (6) The shape memory alloy rod (6) is connected to the shape memory alloy rod (6) so that it can be separated after heating to the memory temperature, and the shape memory alloy rod (6) put in the outer cover (8) is provided in the measurement hole (1) underground. And the outer skin (8) and the shape memory alloy rod (6) are
When the shape memory alloy rod (6) is energized through (9) and heated to the storage temperature, the shape deformed due to landslide is stored, and the shape memory alloy rod (6) and the lead wire (9) And the shape memory alloy rod (6) is pulled out from the measurement hole (1), leaving the lead wire (9), so that the shape memory alloy rod (6) is heated and recalled to the shape to be memorized. Landslide measurement device that is configured in. 4. A measuring hole (1) is provided linearly in the ground.
Insert the shape memory alloy rod (6) into the measurement hole (1),
With the shape memory alloy rod (6) deformed,
Energize the alloy rod (6), heat it to the memory temperature and deform
Shape memory alloy rod, then shape memory alloy rod
After (6) is pulled out from the measurement hole (1), it is stored by heating
Apparatus used for landslide measurement method to recall shape
Oite, the shape memory alloy rods (6) and leads the (9), can be blown fuse (14), the elastic contact can pull by energizing the shape memory alloy rods (6) (13), the shape memory alloy rods ( Holder (1) that is pinched and fixed so that the lower end of 6) can be released
6) and lead wire (9) with shape memory alloy rod (6) in measurement hole (1)
Insert this lead wire (9) into the shape memory alloy rod (6).
Connected to the lower end, and through a lead wire (9)
To the storage temperature by applying power directly to the pad (6),
Separate the lead wire (9) and shape memory alloy rod (6) and
Wire (9) in the measurement hole (1), leaving the shape memory alloy rod (6)
I will pull it out, heat it and recall it to the memorized shape
A landslide measuring device characterized by having the following configuration . 5. The landslide measurement device according to claim 4, wherein the holder (16) is energized to release the sandwiched state of the shape memory alloy rod (6).