JP6071577B2 - Slope change detection structure in slope stabilization method - Google Patents

Description

  This invention makes it possible to minimize damage caused by slope failure even with simple slope stabilization countermeasures, and the residents can take appropriate measures when the possibility of slope failure increases. The present invention relates to a slope fluctuation detection structure suitable for application to a slope stabilization method that makes it possible.

Measures will be taken according to the situation of the slope to minimize the possibility of slope failure and to minimize damage in the event of slope failure. There is Patent Document 1 as a slope stabilization system that enables residents to take appropriate measures when the property increases.
In this slope stabilization system, as an example of slope change detection means for grasping slope change (movement of soil blocks), a tensile material with a strain gauge attached is inserted into a hollow rod (anchor). Slope fluctuation detecting means is shown in which the lower end portion of the tension member is fixed to the lower end of the hollow rod and the upper end portion is fixed to a cap attached to the upper end of the hollow rod. The strain gauge for detecting the strain of the tensile material is attached in the vicinity of the upper end of the tensile material (see FIGS. 8, [0048] and [0049] of Patent Document 1).

Also, Patent Document 2 does not relate to slope stabilization measures, but measures displacements in the ground for measurement tasks such as observation of ground and embankment behavior in mountainous areas as a disaster countermeasure. How to do is described.
The underground displacement measurement method includes a plurality of underground displacement gauges formed by connecting a connecting saddle part and a differential transformer type or strain gauge type sensor saddle part, connected in a rod shape, inserted and arranged, The angular displacement is calculated based on the displacement detected by the displacement meter in each place, and the underground displacement is known.

JP2011-185860 JP-A-10-185633

Since Patent Document 2 does not reinforce the slope itself, it is not satisfactory as compared with a direct measure for preventing slope collapse. If the slope countermeasure by this slope observation is a countermeasure after constructing the slope stabilization method, it can be relieved enough, but in that case it can be said that it is inefficient in terms of cost effectiveness because the construction cost is high. .
On the other hand, in the slope stabilization system of Patent Document 1, since the slope fluctuation detection means is provided in the hollow rod that is an anchor of the slope stabilization method, it is possible to give a sense of security to local residents and to provide the slope fluctuation detection means. It can be said that the cost required for this is extremely low compared with that of Patent Document 2 dedicated to underground displacement measurement, and is extremely efficient in terms of cost effectiveness.

In addition, the slope fluctuation detecting means of Patent Document 2 is configured to connect a plurality of underground displacement meters and insert them into the borehole in a rod shape, and it can be said that the cost as the slope fluctuation detection structure itself is high.
On the other hand, the slope variation detection means in Patent Document 1 is a simple structure in which a tensile material with a strain gauge attached is inserted into the hollow rod, and the upper and lower ends are fixed to the hollow rod and the cap. The cost of the slope fluctuation detection means itself is also extremely low compared with Patent Document 2.

However, the slope fluctuation detecting means of Patent Document 1 has the following problems. When the lump movement occurs, the hollow rod undergoes bending deformation, but the entire hollow rod is not uniformly bent but deformed unevenly, and large bending deformation is mainly deep in the soil layer near the slip surface. As a result, there is a problem that the detection value by the strain gauge directly attached in the vicinity of the upper end of the tensile material as in Patent Document 1 does not necessarily accurately reflect the movement of the soil mass.
In this respect, the slope fluctuation detection means of Patent Document 2 can detect each depth position of the soil layer, so that it can be said that it is possible to accurately detect the movement of soil blocks, but it is not simple, so There is a demand for slope change detecting means that has a simple structure and that can provide accuracy suitable for simple slope stabilization countermeasures.

In the case of Patent Document 1, a tensile material attached with a strain gauge connected with a lead wire is fixed to the lower end of the hollow rod in advance, and the hollow rod is installed on the ground. In the original civil engineering work of slope stabilization work such as installing a hollow rod on the ground or attaching a bearing plate to the hollow rod, there is a strain gauge with a lead wire connected to the tensile material. Since care must be taken not to damage the lead wire, it becomes a factor that reduces the efficiency of the slope stabilization method. As described above, the installation of the slope fluctuation detecting means is included in the work process of the slope stabilization method, which causes a reduction in the construction efficiency of the slope stabilization method.
In addition, since the tensile material is long, it is troublesome to handle a long tensile material to which a strain gauge / lead wire is attached in advance also in conveyance, parts management, construction preparation, etc. before construction.

  Further, in the slope fluctuation detecting means of Patent Document 1, when it becomes necessary to replace the slope fluctuation detecting means after deterioration due to deterioration over time, it is not easy to replace the slope fluctuation detecting means. In other words, since the strain gauge is attached to a tension member whose lower end is fixed to the lower end of the hollow rod, it is difficult to replace the strain gauge by taking out the hollow rod from the soil. Therefore, a slope fluctuation detecting means that can easily replace the slope fluctuation detecting means in the existing slope stabilization work is desired.

  The present invention was made based on the above background, and is a structure that can be constructed easily and inexpensively, is suitable for simple countermeasures for slope stabilization, and also replaces slope fluctuation detection means in existing slope stabilization works Another object of the present invention is to provide a slope fluctuation detecting means in a slope stabilization method that can be easily replaced.

The invention according to claim 1 which solves the above-mentioned problem is provided with a bearing plate mounted on the head of the hollow rod protruding to the ground, with the hollow rod reaching the stationary layer of the slope ground and fixing the lower end of the hollow rod to the stationary layer. Slope fluctuation detection structure in the slope stabilization method that tightens and applies bearing pressure to the ground,
The hollow rod has a rod-like or cord-like elongated member inserted therein, the lower end of the elongated member is fixed to the lower end of the hollow rod, and the upper end of the elongated member protrudes above the hollow rod. The upper end portion of the elongated member is connected to the support member provided on the support plate above the support plate via a displacement detection sensor.

  According to a second aspect of the present invention, in the slope change detection structure according to the first aspect, the displacement detection sensor uses a strain gauge.

  According to a third aspect of the present invention, in the slope change detection structure according to the second aspect, the displacement detection sensor connects the upper end portion of the elongated material and the support member with a curved metal material, and a strain gauge is attached to the curved metal material. It is characterized by being pasted.

According to the present invention, the elongated member is inserted into the hollow rod, the lower end portion thereof is fixed to the lower end portion of the hollow rod, and the upper end portion of the elongated member that protrudes above the bearing plate and the bearing plate are above. With a simple structure in which a support member that is detachably fixed to the bearing plate is connected via a displacement detection sensor, it is possible to detect slope fluctuations (mainly movement of soil blocks).
Thus, in a simplified manner, the lower end portion of the elongated member is fixed to the lower end portion of the hollow rod, and the slope variation detecting means (displacement detection sensor) is provided at the upper end portion of the elongated member. Compared with the structure of Patent Document 2 in which an underground displacement gauge is connected and inserted into a bored hole in a rod shape, the slope fluctuation detection structure itself is less expensive.

In the present invention, if the lower end of the elongated member is fixed to the lower end of the hollow rod, the hollow rod with the elongated member is inserted and installed in the ground, the bearing plate is attached, and the bearing plate is fastened. After finishing the original construction of the chemical method, it becomes possible to attach the slope change detecting means to the bearing plate of each hollow rod. Therefore, unlike the case of Patent Document 1 in which the installation of the slope fluctuation detection means is included in the work process of the slope stabilization method, the original work of the slope stabilization method, which is civil engineering work, and the work of installing the slope fluctuation detection means are performed. It can be completely separated, and it can be avoided that the construction efficiency is greatly reduced due to the provision of the slope fluctuation detecting means.
In addition, since there is no need to attach strain gauges / lead wires to the tension material in transport, parts management, construction preparation, etc. before construction, there is no complication in handling the tension material.

  Further, the displacement detection sensor is different from the slope fluctuation detection means of Patent Document 1 in which a strain gauge is directly attached to the vicinity of the upper end portion of a tensile material integrated with a hollow rod to detect strain, and the displacement detection sensor is hollow through an elongated material. Since the whole surface of the rod is detected to detect the slope fluctuation, there is no problem that the detection value by the strain gauge does not necessarily reflect the slope fluctuation accurately. The overall elongation of the hollow rod represents the behavior of slope change, and the slope change is accurately reflected with accuracy suitable for simple slope stabilization measures.

  In addition, since the slope fluctuation detection means is provided after the slope stabilization method is applied, the slope stabilization is applied unlike the mere underground displacement measuring device of Patent Document 2, which gives local residents a sense of security. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the slope stabilization construction method which is going to apply the slope fluctuation detection structure of this invention, (A) is a schematic top view of the slope which constructed the slope stabilization construction method, (B) is a longitudinal cross-sectional view. . FIG. 1 shows a normal anchor portion that does not have the slope variation detection structure of the present invention in FIG. 1, (A) is a plan view (a plan view as seen from section AA in (B)), and (B) is It is a longitudinal cross-sectional view. It is a longitudinal cross-sectional view which shows the anchor part provided with the slope variation detection structure of this invention. It is BB sectional drawing of FIG. It is the figure which expanded the upper part part from the bearing plate in FIG. It is CC sectional drawing of FIG. (A) is an exploded view of the sensor unit portion in FIG. 5, and (b) is a view seen from the left side of (a). It is the perspective view which showed only the supporting member in FIG. .

  Hereinafter, the form for implementing the slope variation detection structure in the slope stabilization method of this invention is demonstrated with reference to drawings.

FIG. 1 is a diagram for explaining a slope stabilization method to which the slope fluctuation detection structure of the present invention is applied. (A) is a schematic plan view of a slope on which the slope stabilization method is applied, and (b) is a longitudinal section. FIG.
As shown in these figures, in this slope stabilization method, a large number of anchors 1 are installed on the slope so as to reach the immobile layer 10a of the ground 10, and a bearing plate 2 is attached and fastened to the head of each anchor 1. The heads of the anchors 1 are connected with a wire rope 3. Most of the anchors 1 shown in FIG. 1 do not have the slope fluctuation detection structure of the present invention, but some anchors have the slope fluctuation detection structure of the present invention.

FIG. 2 shows a portion of a normal anchor (indicated by reference numeral 1 ') that does not have the slope variation detection structure of the present invention in FIG. 1, and (A) is a plan view (A-A cross section of (B)). (B) is a longitudinal sectional view.
The pressure bearing plate 2 in the illustrated example has a central hole 4a formed at the center of a substantially triangular bottom plate 4 with a chamfered apex, and a cylinder 5 is welded and fixed to the center hole 4a. 6 is fixed by welding, and a washer plate 7 is fixed by welding to the upper end surface of the cylinder 5. The reinforcing rib 6 has a hole 6a through which a wire rope is passed.
The tip of the anchor 1 ′ is embedded in the stationary layer 10 a of the ground, and the head on which the screw in the anchor 1 ′ is formed passes through the center hole 4 a of the bottom plate 4 of the bearing plate 2 and the cylinder 5 and the washer plate 7. The protruding nut 8 is screwed onto the threaded portion of the protruding anchor 1 ′ and tightened, and the bearing plate 2 is engaged with the head of the anchor 1 ′. Thereby, when the convex nut 8 is tightened, the bearing plate 2 presses the ground with the tension acting on the anchor 1 ', contributing to the stabilization of the ground. 10b shows the unstable layer of the slope ground 10. FIG. S is a sliding surface schematically shown.

FIG. 3 is a longitudinal sectional view showing an anchor portion provided with the slope variation detection structure of the present invention on the slope of FIG. 1 subjected to the slope stabilization method, and FIG. 4 is a sectional view taken along the line BB of FIG. 5 is an enlarged view of the upper part of the bearing plate 2 in FIG. 3, and FIG. 6 is a cross-sectional view taken along the line CC in FIG.
In the present invention, a hollow rod is used as an anchor constituting the slope variation detection structure. In FIG. 3 to FIG. 6, reference numeral 1 denotes a hollow rod that is an anchor constituting the slope variation detection structure.
The hollow rod 1 reaches the fixed layer 10a of the slope ground 10 and fixes the lower end of the hollow rod 1 to the fixed layer 10a in the same manner as the normal anchor 1 '. The bearing plate 2 including the bottom plate 4, the cylinder 5, the reinforcing rib 6, the washer plate 7 and the like is the same as the bearing plate 2 in FIG.

In the illustrated example, a rod-like elongated member 12 is inserted into the hollow rod 1. The elongated member 12 has a lower end fixed to the lower end of the hollow rod 1 and an upper end protruding further upward from the upper end of the hollow rod 1. The elongated member 12 is made of a material that is sufficiently high in rigidity as compared to a curved metal plate 18 to be described later and that does not stretch even when the curved metal plate 18 is deformed by a tensile force. It is not limited to a bar, but may be a cord-like body such as a steel wire. The material is not limited to a metal material such as a steel material or a stainless steel material, and may be an aramid or other synthetic fiber. Further, it may be made of carbon fiber or glass fiber.
A bit 15 which is a kind of excavation bit in the illustrated example is fixed to the lower end portion of the hollow rod 1. The lower end portion of the elongated material 12 is fixed to the lower end of the hollow rod 1 by being fixed to the bit 15.
In addition to drilling with the bit 15 fixed to the lower end of the hollow rod 1 as described above, the hollow rod 1 is inserted after drilling with another drilling device, and a cap-like cap is attached instead of the bit 15 You may do it. In this case, the lower end of the elongated member 12 is preferably fixed to the lid-like cap.

An upper end portion of the elongated member 12 and a support member 14 that is located above the support plate 2 and is detachably fixed to the support plate 2 are connected via a sensor unit 16.
As shown in FIG. 8, the support member 14 includes a rectangular base plate 14a that is detachably fixed to the washer plate 7 of the bearing plate 2, and a vertically long U-shaped frame 14b that is fixed by welding on the base plate 14a. The base plate 14a has a center hole 14c through which the hollow rod 1 is inserted at the center, and a screw hole 14d for attaching a protective cap to be described later at the four corners. The vertically long U-shaped frame 14b The plate portion 14e has a bolt insertion hole 14f. Each side plate portion 14g on both sides of the U-shaped frame 14b has three circular holes 14h for facilitating handling of the sensor unit 16.
A protective cap (protective member) 21 having a cylindrical cross section is attached to the base plate 14a of the support member 14 so as to surround the support member 14 and shield and protect the support member 14 and the sensor unit 16 inside thereof. It has been. A mounting member 21a having a substantially L-shaped cross section is welded and fixed to the four outer surfaces of the lower part of the protective cap 21, and the lower part of the mounting member 21a is screwed and fixed to the screw hole 14d of the base plate 14a with a bolt 22.

The threaded portion 1a at the upper end of the hollow rod 1 protrudes upward through the hole 7a of the washer plate 7 of the bearing plate 2 and the central hole 14c of the base plate 14a of the support member 14, and the concave washer 17 is interposed therebetween. The convex nut 8 fitted to the concave washer 17 is screwed and fastened.
As shown in FIGS. 5 to 7, the sensor unit 16 includes a curved metal plate (curved metal material) 18 having an arc-shaped curved portion 18 a and upper and lower flat portions 18 b, and the curved metal plate 18. The upper and lower connecting blocks 19 and 19 ′ are respectively fixed to the upper and lower flat portions 18b.
Each of the connecting blocks 19, 19 ′ includes a rectangular cross-section block portion 19a, 19a ′ and a screw portion 19b, 19b ′ provided integrally at one end thereof, and the flat portion 18b of the curved metal plate 18 is It is inserted into slit portions 19c and 19c ′ formed in the block portions 19a and 19a ′ and fixed with bolts 23 and 23 ′.
A strain gauge 24 is attached to the concave side of the curved portion 18a of the curved metal plate 18 to detect strain caused by a vertical pulling force acting on the curved portion 18a.

The threaded portion 19b of the coupling block 19 on the lower side of the sensor unit 16 and the threaded portion 12a formed at the upper end of the elongated member 12 are coupled via a vertically elongated nut 26. That is, the threaded portion 19b of the lower connecting block 19 and the threaded portion 12a at the upper end of the elongated member 12 are respectively screwed into the vertically long nut 26 from the upper and lower sides, and are loosened by the threaded portion 19b of the lower connecting block 19. The locking nut 27 is screwed and tightened to be firmly connected.
Further, the screw portion 19b ′ of the upper connecting block 19 ′ of the sensor unit 16 is inserted through an adjustment bolt 29 and a vertically long nut 26 ′ that are inserted and fixed in the bolt insertion hole 14f of the top plate portion 14e of the support member 14. It is connected. That is, the adjusting bolt 29 and the threaded portion 19b 'of the upper connecting block 19' are respectively screwed into the vertically long nut 26 'from both the upper and lower sides, and the adjusting bolt 29 is screwed with the locking nut 27' and tightened. It is firmly connected.
The adjustment bolt 29 inserted through the bolt insertion hole 14f of the top plate portion 14e of the support member 14 has an adjustment nut 31 screwed into the top plate portion upper surface side and the lower surface side, respectively. The washer 32 disposed on the lower surface is clamped and fixed to the top plate portion 14e.
The upper and lower pre-adjustment nuts 31 are loosened to bring the adjustment bolts 29 to a desired height position, and the upper and lower adjustment nuts 31 are tightened in this state, thereby adjusting the height position of the adjustment bolts 29, and thereby the sensor unit 16. The vertical position of can be adjusted. By the adjustment, the sensor unit 16 can be set to an appropriate position corresponding to the upper end position of the elongated material 12.

  The lead wire of the strain gauge 24 affixed to the curved metal plate 18 of the sensor unit 16 is not shown, but it is connected to an external strain measuring instrument, or the slope fluctuation is based on the output of the strain gauge 24. It is preferable to connect to a slope fluctuation signal transmitting means for wirelessly transmitting the detection signal. In the latter case, for example, immediately after transmitting wirelessly to multiple slope change signal receivers that receive slope change signals installed in workplaces, private houses, apartment houses, and administrative institutions near the target slope, etc. This is effective when building an alarm system or the like that can take countermeasures.

In the slope change detection structure described above, when the unstable layer 10b moves down the slope with respect to the stationary layer 10a on the slope ground, the hollow rod 1 in the soil block (movable soil block) of the moved unstable layer is greatly deformed. . Since the lower end portion of the hollow rod 1 is fixed to the non-moving layer 10a, the portion in the non-moving layer 10a of the hollow rod 1 is hardly deformed, and the portion of the unstable layer 10a is largely bent and deformed by the force of the moving soil block. At the same time, the bearing plate 2 sinks into the ground.
A tensile force acts on the elongated member 12 due to such bending / extension of the hollow rod 1 and the phenomenon that the bearing plate sinks, but the lower end of the elongated member 12 having sufficient rigidity is fixed to the lower end of the hollow rod 1 and the upper end thereof is Since it is connected to the support member 14 having high rigidity via the curved metal plate 18 that can be easily deformed as compared with the elongated material 12, the curved metal plate is output by the output signal of the strain gauge 24 attached to the curved metal plate 18. It is possible to detect the overall elongation of the plate 18 (elongation in the lengthwise direction of the elongated material = the amount of expansion of the interval between the upper and lower block portions 19a). The total elongation (elongation amount) of the curved metal plate 18 indicates a displacement of the upper end position of the elongated material 12 relative to the upper end position of the hollow rod, assuming that no elongation occurs in the elongated material 12 having sufficiently high rigidity relative to the curved metal plate 18. . Therefore, the total elongation (elongation amount) of the curved metal plate 18 can be detected from the output signal of the strain gauge 24, and the total elongation (elongation amount) of the hollow rod 1 can be detected. By attaching the strain gauge 24 to the curved metal plate 18, extremely good sensitivity can be ensured.
Note that the bending deformation of the hollow rod 1 is not a uniform bending deformation over the entire length but a deformation that greatly bends near the sliding surface. Therefore, when the strain of the hollow rod 1 is detected by a strain gauge attached directly to the hollow rod 1. The strain is a local strain and does not indicate the overall elongation of the hollow rod 1, but the overall elongation of the hollow rod 1 can be detected by the detection using the elongated material 12.
The relationship between the bending / elongation of the hollow rod 1 when the slope change occurs, the phenomenon of the subsidence of the bearing plate and the slope change state depends on the ground properties, so it cannot be determined as a strict correspondence. By detecting the displacement of the upper end portion of the elongated material 12 at the sensor unit 16, it is possible to obtain effective data particularly for the purpose of detecting slope fluctuations for issuing a warning to local residents.
It should be noted that a curved metal material having a shape that is easily stretched as in the above embodiment is used for the portion where the strain gauge is affixed in the sensor unit (displacement detection sensor) 16 to increase the stretch sensitivity, and the shape is not particularly limited. Easy stretch material may be used to increase elongation sensitivity. For example, a soft metal such as mild steel, brass, phosphor bronze, and aluminum having a low Young's modulus and a high elongation sensitivity may be used, or a resin having elasticity such as rubber instead of a metal may be used. Further, the shape may be a curved shape, and the material may be soft metal or elastic resin.

According to the above-described slope fluctuation detection structure, as described above, the elongated member 12 is inserted into the hollow rod 1, the lower end portion thereof is fixed to the lower end portion of the hollow rod 1, and the elongated member is protruded above the bearing plate 2. A simple structure in which the upper end portion of the material 12 and the support member 14 that is above the support plate 2 and is detachably fixed to the support plate 2 are connected via a sensor unit (displacement detection sensor) 16, and the slope changes. Can be detected.
Thus, in a simplified manner, since the lower end portion of the elongated member 12 is fixed to the lower end portion of the hollow rod 1 and the slope variation detecting means is provided at the upper end portion of the elongated member 12, a plurality of underground Compared with the structure of Patent Document 2 in which a displacement meter is connected and inserted into a boring hole in a rod shape, the slope fluctuation detection structure itself is less expensive.

Alternatively, if the lower end portion of the elongated material 12 is fixed to the lower end portion of the hollow rod 1, the hollow rod 1 with the elongated material is inserted and installed in the ground, the bearing plate 2 is attached, and the bearing plate 2 is fastened. After finishing the original construction of the slope stabilization method, it is possible to attach slope change detection means (sensor unit 16) to the bearing plate 2 of each hollow rod 1. Therefore, unlike the case of Patent Document 1 in which the installation of the slope fluctuation detection means is included in the work process of the slope stabilization method, the original work of the slope stabilization method, which is civil engineering work, and the work of installing the slope fluctuation detection means are performed. It can be completely separated, and it can be avoided that the construction efficiency is greatly reduced due to the provision of the slope fluctuation detecting means.
In addition, since there is no need to attach a strain gauge / lead wire to the elongated material 12 in transport, parts management, construction preparation, etc. before construction, there is no complication in handling the elongated material 12.

  Further, unlike the slope fluctuation detecting means of Patent Document 1 in which the displacement detection sensor detects the strain at the upper end of the tensile material integrated with the hollow rod, the entire elongation of the hollow rod 1 is detected via the elongated material 12. Thus, since the slope variation is detected, there is no problem that the detection value by the strain gauge does not necessarily reflect the slope variation accurately. The overall elongation of the hollow rod 1 represents the behavior of the lump movement, and the behavior of the lump movement is reflected almost correctly with an accuracy suitable for simple slope stabilization measures.

In addition, since the slope fluctuation detection means (sensor unit 16) is provided after the slope stabilization method is applied, the slope stabilization is applied unlike the mere underground displacement measuring device of Patent Document 2, so A sense of security can be given.
In the embodiment, the heads of the anchors (the hollow rod 1 constituting the slope variation detection structure of the present invention and the normal anchor 1 ') are connected by the wire rope 3, but the heads of the anchors It can also be applied to a slope stabilization method in which the wire rope 3 is not connected. Moreover, although many hollow rods 1 and bearing plates 2 are arranged in FIG. 1, it can also be applied to a small-scale slope stabilization method in which the hollow rods 1 and bearing plates 2 are locally arranged at two to three locations. .

1 Hollow rod (anchor with slope change detection structure)
1 '(not provided with slope change detection structure) anchor 2 bearing plate 3 wire rope 4 bottom plate 4a center hole 5 cylinder 6 reinforcing rib 6a (through the wire rope) hole 7 washer plate 8 convex nut 10 slope ground 10a non-moving layer 10b Unstable layer S Sliding surface 12 Elongated material 12a Screw part 14 Support member 14a Base plate 14b U-shaped frame 14c Center hole 14d Screw hole 14e Top plate part 14f Bolt insertion hole 14g Side plate part 14h Circular hole 16 Sensor unit (displacement detection sensor)
17 Concave washer 18 Curved metal plate (curved metal material)
18a Curved part 18b Flat part 19, 19 'Connection block 19a, 19a' Block part 19b, 19b 'Screw part 19c Slit part 21 Protective cap (protective member)
21a Mounting member 23, 23 'Bolt 24 Strain gauge 26, 26' Vertical nut 27, 27 'Loosening prevention nut

Claims (3)

A slope that applies a support pressure to the ground by allowing the hollow rod to reach the stationary layer of the slope ground, fixing the lower end of the hollow rod to the stationary layer, and fastening a bearing plate attached to the head of the hollow rod protruding to the ground It is a slope fluctuation detection structure in the stabilization method,
The hollow rod has a rod-like or cord-like elongated member inserted therein, the lower end of the elongated member is fixed to the lower end of the hollow rod, and the upper end of the elongated member protrudes above the hollow rod. In the slope stabilization method, wherein the upper end portion of the elongated material and the support member provided on the support plate above the support plate are connected via a displacement detection sensor. Slope fluctuation detection structure.   2. The slope variation detection structure in the slope stabilization method according to claim 1, wherein the displacement detection sensor uses a strain gauge.   The inclined surface according to claim 2, wherein the displacement detection sensor is formed by connecting an upper end portion of the elongated material and the support member with a curved metal material, and attaching a strain gauge to the curved metal material. Slope fluctuation detection structure in the stabilization method.

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