JP3501400B2 - Slope failure detection device - Google Patents
Slope failure detection deviceInfo
- Publication number
- JP3501400B2 JP3501400B2 JP2001052203A JP2001052203A JP3501400B2 JP 3501400 B2 JP3501400 B2 JP 3501400B2 JP 2001052203 A JP2001052203 A JP 2001052203A JP 2001052203 A JP2001052203 A JP 2001052203A JP 3501400 B2 JP3501400 B2 JP 3501400B2
- Authority
- JP
- Japan
- Prior art keywords
- sensor cable
- core wire
- weak point
- cable
- slope
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Testing Or Calibration Of Command Recording Devices (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鉄道や道路等を建
設するときに山を削り取った切土等の斜面の崩壊を簡単
な装置で確実に検知できるようにした斜面崩壊検知装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope failure detecting device capable of reliably detecting a slope failure such as cut soil cut from a mountain when constructing a railway or a road with a simple device. is there.
【０００２】[0002]
【従来の技術】従来、土砂崩れ、地すべり、土石流など
の斜面崩壊を検出するには、特公平３−９２４７号公報
記載のように、危険区域に複数本の杭を打ち込み、その
杭に光ファイバーを張り巡らし、地すべりで杭が流され
ると、別に設けたカッターで切断されるか、カムにより
局部的な曲げを発生させ、後方散乱光の急激な減少を検
出することで地すべりの発生を検出する方法が知られて
いる。2. Description of the Related Art Conventionally, in order to detect a slope failure such as a landslide, a landslide, a debris flow, etc., as described in Japanese Examined Patent Publication No. 3-9247, a plurality of piles are driven into a dangerous area and optical fibers are attached to the piles. When the piles are swirled around and the landslide is swept, it is either cut by a separately provided cutter or a cam is used to locally bend the pile to detect the occurrence of landslide by detecting a sharp decrease in backscattered light. Are known.
【０００３】また、光ファイバーに代えて同軸ケーブル
を張り巡らし、地すべりに伴う振動でケーブルの芯線と
外周の絶縁体との間に容量変化を生じさせ、この容量変
化に伴う電圧変化が閾値を越えたかどうかで地すべりを
検知する方法もある。Further, instead of the optical fiber, a coaxial cable is stretched around, and a capacitance change is caused between the core wire of the cable and the insulator on the outer circumference by the vibration accompanying the landslide, and whether the voltage change due to the capacitance change exceeds a threshold value. There is also a method of detecting landslides.
【０００４】[0004]
【発明が解決しようとする課題】以上のような従来の方
法では、いずれも装置が大がかりで高価であり、しか
も、地すべりの危険区域への設置や調整が面倒である、
という問題があった。In each of the conventional methods described above, the apparatus is large and expensive, and the installation and adjustment of the landslide in a dangerous area is troublesome.
There was a problem.
【０００５】また、一般に、切土法面は、表層に土石流
や土砂崩れなどの斜面崩壊が生じ易い。ところが、セン
サーとして張り巡らした光ファイバーや同軸ケーブルで
は、感度がよすぎると、切土法面への現場での設置作業
中にセンサー部分が破損したり、雨、風、小さな土石
流、動物の衝突などでもセンサー部分が誤動作してしま
うので、感度の調整が面倒である、という問題があっ
た。[0005] In general, cut slopes tend to cause slope failures such as debris flow and landslides in the surface layer. However, if the optical fiber or coaxial cable stretched around as a sensor is too sensitive, the sensor part will be damaged during installation work on the cut slope on site, rain, wind, small debris flow, collision of animals etc. However, since the sensor part malfunctions, there is a problem that sensitivity adjustment is troublesome.
【０００６】本発明は、切土法面などの斜面崩壊におい
て、センサー自体が丈夫で、設置作業や運搬に支障がな
く、その反面、一定以上の荷重を受けると、確実に検知
でき、しかも、安価に提供できる装置を得ることを目的
とするものである。According to the present invention, when the slope collapses such as a cut slope, the sensor itself is strong and does not hinder the installation work or transportation. On the other hand, it is possible to reliably detect when a certain load is applied, and moreover, The purpose is to obtain a device that can be provided at low cost.
【０００７】[0007]
【課題を解決するための手段】センサーケーブル１３の
芯線２０を構成する銅線の伸びは、素材データから凡そ
２０％と考えられおり、このような大きな伸びで切断す
るものをセンサーとして使用することは困難か、ほとん
ど不可能であるので、小さな変形で切断させるようにす
ることが必要である。そこで、本発明では、センサーケ
ーブル１３を構成する複数本を束ねた芯線２０の一部を
露出し、この露出部分の近接した芯線２０の２個所を接
合部２１で一体的に接合し、これら２個所の接合部２１
の間の芯線２０の一部を切断して、２個の接合部２１の
間を十分短くし、かつ、この接合部２１間の芯線２０の
数を減らして弱点部１７とした。この結果、弱点部１７
の個所に集中応力が働き、たわみ距離が十分短くても切
断することができる。The elongation of the copper wire that constitutes the core wire 20 of the sensor cable 13 is considered to be about 20% based on the material data, and it is necessary to use the one that is cut with such a large elongation as a sensor. Since it is difficult or almost impossible, it is necessary to make it cut with a small deformation. Therefore, in the present invention, a part of the core wire 20 that bundles a plurality of the sensor cables 13 is exposed, and two adjacent parts of the core wire 20 that are adjacent to the exposed portion are integrally bonded by a bonding portion 21. Joint part 21
A part of the core wire 20 between the two joints 21 is shortened sufficiently, and the number of the core wires 20 between the joints 21 is reduced to form a weak point portion 17. As a result, the weak points 17
Concentrated stress acts on the point of, and can be cut even if the bending distance is sufficiently short.
【０００８】すなわち、本発明は、土砂崩壊監視位置に
少なくとも２本の第１ライン１８、第２ライン１９を張
設して閉回路を構成するセンサーケーブル１３と、前記
第１ライン１８と第２ライン１９のうちの少なくともい
ずれか一方の途中に所定間隔で設けられる切断に対する
弱点部１７と、前記センサーケーブル１３に被せて保護
する保護管１４と、この保護管１４に、センサーケーブ
ル１３における前記弱点部１７を外した位置でセンサー
ケーブル１３を固着するケーブル固着部２７とからな
り、土砂崩壊監視位置に支持杭１５を所定間隔で差し込
み、この支持杭１５の地上から突出した位置に、保護管
１４におけるケーブル固着部２７部分を固着し、また前
記弱点部１７は、センサーケーブル１３を構成する複数
本を束ねた芯線２０の一部を露出し、この露出部分の近
接した芯線２０の２個所を接合部２１で一体的に接合
し、これら２個所の接合部２１の間の芯線２０の一部を
切断してなることを特徴とする斜面崩壊検知装置であ
る。That is, according to the present invention, at least two first lines 18 and second lines 19 are stretched at the sediment collapse monitoring position to form a closed circuit, and the first line 18 and the second line 18. A weak point portion 17 provided at a predetermined interval in the middle of at least one of the lines 19 against cutting, a protective tube 14 that covers and protects the sensor cable 13, and the weak point in the sensor cable 13 to the protective tube 14. It is composed of a cable fixing portion 27 for fixing the sensor cable 13 at a position where the portion 17 is removed, and the support piles 15 are inserted into the sediment collapse monitoring position at predetermined intervals, and the protection pipe 14 is provided at a position protruding from the ground of the support piles 15. The cable fixing portion 27 of the sensor cable 13 is fixed, and the weak point portion 17 is a core wire 20 formed by bundling a plurality of the sensor cables 13. A part is exposed, two parts of the core wire 20 adjacent to the exposed part are integrally joined by a joint part 21, and a part of the core wire 20 between the two joint parts 21 is cut. It is a characteristic slope failure detection device.
【０００９】[0009]
【発明の実施の形態】以下、本発明の一実施例を図面に
基づき説明する。図１において、１０は、地山そのもの
か地山の一部を切り取って形成した切土法面である。こ
の切土法面１０の裾部分には、例えば、盛土１１が盛り
上げられて鉄道路床などが形成され、その上に軌条１２
が敷設される。前記切土法面１０の斜面崩壊検知場所に
は、本発明による斜面崩壊検知装置が設けられている。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 10 is a ground slope itself or a cut slope formed by cutting a part of the ground. At the hem of the cut slope 10, for example, an embankment 11 is piled up to form an iron road floor, and a rail 12 is formed on the iron road floor.
Is laid. A slope failure detection device according to the present invention is provided at the slope failure detection location of the cut slope 10.
【００１０】本発明による斜面崩壊検知装置は、内部に
センサーケーブル１３を挿入した保護管１４を、数ｍ程
度の間隔をもって切土法面１０に打ち込んだ支持杭１５
に、連結金具１６で固着し、隣合う支持杭１５の間に
は、前記保護管１４内のセンサーケーブル１３における
少なくとも１乃至数個所に切断に対する弱点部１７を設
けてなるものである。In the slope failure detecting device according to the present invention, a support pile 15 in which a protective pipe 14 having a sensor cable 13 inserted therein is driven into the cut slope 10 at intervals of about several meters.
In addition, a weak point portion 17 for cutting is provided at at least one or several places in the sensor cable 13 in the protection tube 14 between the adjacent support piles 15 which are fixed to each other by the connecting metal fittings 16.
【００１１】前記弱点部１７の詳細を図２に基づき説明
すると、前記センサーケーブル１３は、少なくとも２本
の第１ライン１８、第２ライン１９を具備し、これらの
外周が一体にシールド網２２でシールドされている。こ
れら第１ライン１８と第２ライン１９のうちのいずれか
一方、例えば、第１ライン１８の絶縁外套の一部を削り
取り、芯線２０を露出させる。この芯線２０は、例え
ば、直径０．７５ｍｍの銅の細線を３０本束ねたもの
（ＭＶＶＳ０．７５）とすると、この芯線２０の露出部
分における約２０ｍｍの間隔をおいた２個所に、半田な
どで固めて接合部２１を形成し、これら接合部２１の間
の芯線２０の細線の一部の２０本を切り取って、残りを
１０本だけとすることにより切断に対する弱点部１７を
構成する。The details of the weak point portion 17 will be described with reference to FIG. 2. The sensor cable 13 includes at least two first lines 18 and second lines 19, and the outer peripheries thereof are integrally formed by a shield net 22. It is shielded. Either one of the first line 18 and the second line 19, for example, a part of the insulating jacket of the first line 18 is shaved off to expose the core wire 20. If the core wire 20 is, for example, a bundle of 30 thin copper wires having a diameter of 0.75 mm (MVVS 0.75), the core wire 20 is soldered to two exposed parts of the core wire 20 at intervals of about 20 mm. A weak point portion 17 for cutting is formed by solidifying the joint portions 21 and cutting off a part of 20 thin wires of the core wire 20 between the joint portions 21 and leaving only 10 remaining portions.
【００１２】前記弱点部１７の芯線２０の残りの本数
は、図４（ａ）に示すように、２本の支持杭１５間距離
ｙの保護管１４に所定の荷重を与えたとき、所定のたわ
み距離ｘで切断するようにしてある。例えば、２本の支
持杭１５間距離ｙ＝５ｍの保護管１４に１５０ｋｇの荷
重を与えたとき、たわみ距離ｘ＝５０ｃｍ程度で切断す
るようにしてある。前記第１ライン１８の芯線２０を露
出した部分は、雨水で短絡事故などを起こさないよう
に、絶縁テープ２３を巻きつけて被覆する。このとき、
折角形成した弱点部１７が機械的強度を増加したり、設
計した切断強度に影響を与えたりしない程度とする。ま
た、シールド網２２を除いた部分にも、必要に応じてシ
ールドテープ２４を巻きつける。このような弱点部１７
は、例えば、センサーケーブル１３に、支持杭１５間で
１乃至数個所の間隔で形成される。As shown in FIG. 4A, the remaining number of the core wires 20 of the weak point portion 17 is a predetermined value when a predetermined load is applied to the protective pipe 14 having the distance y between the two support piles 15. The cutting is performed at the bending distance x. For example, when a load of 150 kg is applied to the protection tube 14 having a distance y = 5 m between the two support piles 15, the bending is cut at a bending distance x = about 50 cm. The exposed portion of the core wire 20 of the first line 18 is covered with an insulating tape 23 so as not to cause a short circuit accident due to rainwater. At this time,
The weak points 17 formed at the corners do not increase the mechanical strength or affect the designed cutting strength. Further, the shield tape 24 is wound around the portion excluding the shield net 22 as required. Such weak points 17
Are formed, for example, on the sensor cable 13 between the support piles 15 at intervals of 1 to several places.
【００１３】以上のようにして切断に対する弱点部１７
を形成したセンサーケーブル１３は、図３に示すよう
に、アルミニウムなどの保護管１４の中に挿入して、例
えば、５ｍ間隔で押しつぶしてセンサーケーブル１３が
移動できないようにしっかりと固定したケーブル固着部
２７とする。このとき、前記弱点部１７は、ケーブル固
着部２７の略中間位置とする。As described above, the weak point portion 17 against cutting
As shown in FIG. 3, the sensor cable 13 formed with the cable is inserted into a protective tube 14 made of aluminum or the like, and is crushed at intervals of, for example, 5 m to firmly fix the sensor cable 13 so that it cannot move. 27. At this time, the weak point portion 17 is located at a substantially intermediate position of the cable fixing portion 27.
【００１４】以上のようにして形成されたセンサーケー
ブル１３入りの保護管１４は、切土法面１０の斜面部分
など、土砂崩壊検知現場に運ばれる。まず、本発明によ
る斜面崩壊検知装置の設置場所には、図１に示すよう
に、支持杭１５が所定間隔、例えば、５ｍ間隔で差し込
まれる。この支持杭１５を結ぶ線は、地すべりや土石流
が発生すると考えられる方向に対して略直角方向とす
る。これらの支持杭１５の地上から約１０ｃｍ程度突出
した位置に、支持杭１５を構成する一方の半円状の２個
の固着リング２８を嵌め込み、ボルト３０とナット３１
とでしっかりと固定する。The protective tube 14 containing the sensor cable 13 formed as described above is carried to a sediment collapse detection site such as a slope portion of the cut slope 10. First, as shown in FIG. 1, the support piles 15 are inserted at a predetermined interval, for example, at an interval of 5 m, at the installation location of the slope failure detection device according to the present invention. The line connecting the support piles 15 is substantially perpendicular to the direction in which a landslide or debris flow is considered to occur. At one of these support piles 15 protruding from the ground by about 10 cm, the two semicircular fixing rings 28 constituting the support pile 15 are fitted, and the bolt 30 and the nut 31 are attached.
Secure with and.
【００１５】次に、支持杭１５に沿って配置したセンサ
ーケーブル１３入りの保護管１４におけるケーブル固着
部２７の位置には、前記支持杭１５の他方の半円状の２
個の固着リング２９を嵌め込み、ボルト３０とナット３
１でしっかりと固定する。このようにして、センサーケ
ーブル１３入りの保護管１４は、図１に示すように、弱
点部１７が支持杭１５の略中間に位置するようにして配
置される。また、図３に示すように、センサーケーブル
１３の先端部には、抵抗値の大きな、例えば、５００ｋ
Ωの端末抵抗２６が接続される。また、センサーケーブ
ル１３の基端部には、検知回路２５が接続される。Next, at the position of the cable fixing portion 27 in the protective tube 14 containing the sensor cable 13 arranged along the support pile 15, the other semicircular shape of the support pile 15 is formed.
Insert the fixing ring 29, bolt 30 and nut 3
Secure with 1 firmly. In this way, the protection tube 14 containing the sensor cable 13 is arranged so that the weak point portion 17 is located substantially in the middle of the support pile 15, as shown in FIG. Further, as shown in FIG. 3, the tip end of the sensor cable 13 has a large resistance value, for example, 500 k.
A terminal resistance 26 of Ω is connected. A detection circuit 25 is connected to the base end of the sensor cable 13.
【００１６】前記検知回路２５は、センサーケーブル１
３の両端間に常時一定の電圧（例えば、直流２４Ｖ、交
流電圧１００Ｖなど）を供給する電源回路、断線、短絡
などの警報信号を出力する警報出力回路などを具備して
いる。この検知回路２５は、有線、無線などで基地局へ
接続される。The detection circuit 25 includes the sensor cable 1
A power supply circuit for constantly supplying a constant voltage (for example, DC 24V, AC voltage 100V, etc.), an alarm output circuit for outputting an alarm signal of disconnection, short circuit, and the like are provided between both ends of 3. The detection circuit 25 is connected to the base station by wire or wirelessly.
【００１７】次に本発明による斜面崩壊検知装置の作用
を説明する。切土法面１０に斜面崩壊が発生し、元の位
置の直線状の保護管１４が図４（ａ）のように湾曲した
ものとし、これを保護管１４ａする。保護管１４は、両
側の支持杭１５にケーブル固着部２７によって固着され
ているので、土石流により所定のたわみ距離ｘだけ直交
方向の伸びが発生する。この伸びた保護管１４ａの内部
では、センサーケーブル１３にも伸びが発生し、このセ
ンサーケーブル１３の伸びが一定値を越すと、弱点部１
７の点で第１ライン１８が確実に切断する。この弱点部
１７を設けたことにより、予め設定した比較的小さな変
形で切断する原理を以下に説明する。Next, the operation of the slope failure detection device according to the present invention will be described. Slope collapse occurs on the cut slope 10, and the linear protective tube 14 at the original position is curved as shown in FIG. 4A, and this is referred to as a protective tube 14a. Since the protection pipe 14 is fixed to the support piles 15 on both sides by the cable fixing portions 27, the debris flow causes expansion in the orthogonal direction by a predetermined bending distance x. Inside the stretched protective tube 14a, the sensor cable 13 also stretches, and when the stretch of the sensor cable 13 exceeds a certain value, the weak point 1
The first line 18 surely cuts at point 7. The principle of cutting with a comparatively small deformation set in advance by providing the weak point portion 17 will be described below.
【００１８】（１）図４（ａ）において、伸びる前の保
護管１４が直線で、伸びた後の保護管１４ａが円弧状で
あるとすると、伸びの計算式は、（ｂ）に示すような図
で示され、次式のようになる。
ｏ：円弧の中心点、
ｒ：円弧の半径、
ｙ：伸びる前のセンサーケーブル１３の支持杭１５間の
距離、
ａ：中心点ｏからｙの中点までの長さ、
ｘ：センサーケーブル１３の直交方向のたわみ距離、
Ｌ：センサーケーブル１３の円弧の長さ
とすると、ｒ ２
＝（ｙ／２）２＋ａ２＝（ｙ／２）２＋（ｒ−ｘ）
２
∴ｒ＝（ｙ２／４＋ｘ２）／２ｘ
ｃｏｓθ＝ａ／ｒ＝（ｒ−ｘ）／ｒ
∴θ＝ａｒｃｃｏｓ（ｒ−ｘ）／ｒ
となる。
Ｌ＝２πｒ×２θ／３６０……………………（１）
であるから、この（１）式において、ｒとθは、計測値
のｘとｙから計算できるので、センサーケーブル１３の
円弧の長さＬは、上記（１）式を演算することで求める
ことができる。(1) In FIG. 4 (a), assuming that the protection tube 14 before expansion is a straight line and the protection tube 14a after expansion is arcuate, the formula for the expansion is as shown in (b). It is shown in the following figure and becomes as follows. o: center point of arc, r: radius of arc, y: distance between support piles 15 of sensor cable 13 before extension, a: length from center point o to midpoint of y, x: sensor cable 13 Deflection distance in the orthogonal direction, where L is the length of the arc of the sensor cable 13, r 2 = (y / 2) 2 + a 2 = (y / 2) 2 + (r−x)
A 2 ∴r = (y 2/4 + x 2) / 2x cosθ = a / r = (r-x) / r ∴θ = arccos (r-x) / r. L = 2πr × 2θ / 360 (1) Therefore, in this equation (1), r and θ can be calculated from the measured values x and y, so the arc of the sensor cable 13 can be calculated. The length L of can be obtained by calculating the above equation (1).
【００１９】（２）センサーケーブル１３の芯線２０を
構成する銅線の伸びは、素材データから凡そ２０％と考
えられている。従って、例えば、前記ｙ＝５ｍのセンサ
ーケーブル１３は、５ｍ×２０％＝１ｍまで伸びて切断
する。このような大きな伸びで切断するものをセンサー
として使用することは困難か、ほとんど不可能であるの
で、予め設定された比較的小さな変形で切断させるよう
にすることが必要である。そこで、本発明の実施例で
は、２個の接合部２１の間を十分短くし、かつ、この接
合部２１間の芯線２０の数を減らして切断に対する弱点
部１７とした。この結果、弱点部１７の個所に集中応力
が働き、たわみ距離ｘが予め設定された十分短い距離で
切断することが判明した。(2) The elongation of the copper wire forming the core wire 20 of the sensor cable 13 is considered to be about 20% from the material data. Therefore, for example, the sensor cable 13 of y = 5 m extends up to 5 m × 20% = 1 m and is cut. Since it is difficult or almost impossible to use a sensor that cuts with such a large elongation as a sensor, it is necessary to cut with a relatively small preset deformation. Therefore, in the embodiment of the present invention, the distance between the two joint portions 21 is sufficiently shortened, and the number of the core wires 20 between the joint portions 21 is reduced to form the weak point portion 17 against cutting. As a result, it was found that the concentrated stress acts on the weak point portion 17 and the bending distance x cuts at a preset sufficiently short distance.
【００２０】具体的な実験によれば、センサーケーブル
１３としてＭＶＶＳ０．７５という規格のケーブルを使
用し、２個の接合部２１の間を２０ｍｍとし、この間の
芯線２０の数を３０本から１０本に減らして弱点部１７
とした。そして、ｙ＝５ｍのセンサーケーブル１３に１
５０ｋｇの荷重を加えたとき、たわみ距離ｘが５００ｍ
ｍ程度で弱点部１７が切断した。弱点部１７を設けない
センサーケーブル１３の実験では、ｙ＝５ｍのとき、大
きな荷重をかけると、たわみ距離ｘが１ｍ程度まで得ら
れたので、たわみ距離ｘが５００ｍｍ程度で切断するも
のであれば、十分実用的であることが判明した。According to a concrete experiment, a cable of MVVS 0.75 standard is used as the sensor cable 13, the distance between the two joints 21 is set to 20 mm, and the number of the core wires 20 between them is 30 to 10. Weak points 17
And And 1 for the sensor cable 13 of y = 5m
When a load of 50 kg is applied, the deflection distance x is 500 m
The weak point 17 was cut at about m. In the experiment of the sensor cable 13 in which the weak point portion 17 is not provided, when a large load is applied when y = 5 m, the bending distance x is obtained up to about 1 m, so that if the bending distance x is cut at about 500 mm. Proved to be practical enough.
【００２１】前記実施例では、センサーケーブル１３を
構成するものとして、細い銅線を複数本を束ねた芯線２
０の場合とし、この芯線２０の一部を露出し、この露出
部分の近接した芯線２０の２個所を接合部２１で一体的
に接合し、これら２個所の接合部２１の間の芯線２０の
一部を切り取るようにして切断に対する弱点部１７とし
た。しかし、これに限られるものではなく、センサーケ
ーブル１３を構成するものとして、太い１本の銅線だけ
からなる芯線２０であってもよく、このような場合に
は、太い１本の銅線の一部に切り込みを入れて応力が集
中するようにして切断に対する弱点部１７とすることも
できる。このとき、接合部２１は、必ずしも設ける必要
がない。In the above-described embodiment, the core wire 2 which bundles a plurality of thin copper wires is used as the sensor cable 13 as a constituent.
In the case of 0, a part of the core wire 20 is exposed, two adjacent parts of the core wire 20 in this exposed part are integrally joined by a joint part 21, and the core wire 20 between the two joint parts 21 is connected. Weakened portions 17 were formed by cutting off a part. However, the present invention is not limited to this, and the core wire 20 that is made up of only one thick copper wire may be used to configure the sensor cable 13. In such a case, a thick copper wire may be used. It is also possible to form a weak point portion 17 against cutting by making a notch in a part so that stress is concentrated. At this time, the joint portion 21 does not necessarily have to be provided.
【００２２】前記実施例では、センサーケーブル１３入
りの保護管１４を支持杭１５の上端に固着したが、本発
明は、これに限られるものではなく、切土法面１０に形
成したコンクリートなどの台座上に取り付けるようにし
てもよい。前記実施例では、センサーケーブル１３を地
上からやや浮かして取り付けたが、本発明は、これに限
られるものではなく、地中に埋め込むようにしてもよ
い。In the above embodiment, the protective tube 14 containing the sensor cable 13 is fixed to the upper end of the support pile 15. However, the present invention is not limited to this, and concrete such as concrete formed on the cut slope 10 can be used. You may make it attach on a pedestal. In the above embodiment, the sensor cable 13 is attached so as to be slightly floated from the ground, but the present invention is not limited to this and may be embedded in the ground.
【００２３】[0023]
【発明の効果】請求項１記載の発明によれば、土砂崩壊
監視位置に少なくとも２本の第１ライン１８、第２ライ
ン１９を張設して閉回路を構成するセンサーケーブル１
３と、前記第１ライン１８と第２ライン１９のうちの少
なくともいずれか一方の途中に所定間隔で設けられる切
断に対する弱点部１７と、前記センサーケーブル１３に
被せて保護する保護管１４と、この保護管１４に、セン
サーケーブル１３における前記弱点部１７を外した位置
でセンサーケーブル１３を固着するケーブル固着部２７
とを具備したので、装置が簡単で安価であり、しかも、
地すべりの危険区域への設置や調整の必要がない。ま
た、現場での設置作業中にセンサー部分が破損したり、
雨、風、小さな土石流、動物の衝突などでもセンサー部
分が誤動作してしまうこともないばかりか、一定以上の
荷重を受けると、確実に検知できる。According to the invention described in claim 1, the sensor cable 1 which forms a closed circuit by stretching at least two first lines 18 and second lines 19 at the sediment collapse monitoring position.
3, a weak point portion 17 for cutting which is provided at a predetermined interval in the middle of at least one of the first line 18 and the second line 19, and a protective tube 14 which covers and protects the sensor cable 13. A cable fixing portion 27 for fixing the sensor cable 13 to the protective tube 14 at a position where the weak point portion 17 of the sensor cable 13 is removed.
Since it is equipped with, the device is simple and inexpensive, and
There is no need to install or adjust landslides in hazardous areas. Also, the sensor part may be damaged during installation work on site,
The sensor part does not malfunction even when rain, wind, small debris flow, or animal collision occurs, and it can be detected reliably when a certain load is applied.
【００２４】[0024]
【００２５】 さらに、弱点部１７は、センサーケーブ
ル１３を構成する複数本を束ねた芯線２０の一部を切断
して構成したので、センサーの製作が極めて簡単で、し
かも、切り取る銅線の本数で規制するだけで種々の荷重
の大きさに対応できる。 Further, since the weak point portion 17 is formed by cutting a part of the core wire 20 which is a bundle of a plurality of wires constituting the sensor cable 13, the sensor is extremely easy to manufacture and the number of copper wires to be cut out is very small. It is possible to cope with various load magnitudes simply by restricting it.
【００２６】 請求項２記載の発明によれば、弱点部１
７は、センサーケーブル１３を構成する複数本を束ねた
芯線２０の一部を露出し、この露出部分の近接した芯線
２０の２個所を接合部２１で一体的に接合し、これら２
個所の接合部２１の間の芯線２０の一部を切断して構成
したので、２個所の接合部２１の間に応力をより集中さ
せることができる。According to the invention of claim 2 , the weak point portion 1
7 exposes a part of the core wire 20 that bundles a plurality of wires that constitute the sensor cable 13, and integrally joins two portions of the core wire 20 that are adjacent to the exposed portion with a joint portion 21.
Since a part of the core wire 20 between the joints 21 at the points is cut and configured, the stress can be more concentrated between the joints 21 at the two points.
【００２７】 請求項３記載の発明によれば、芯線２０
の露出部分を弱点部１７の形成後にシールドテープ２４
で被覆したので、雨水等で短絡する事故を防止できる。According to the invention of claim 3 , the core wire 20
After forming the weak points 17 on the exposed part of the shield tape 24
Since it is covered with, it is possible to prevent accidents such as short circuit due to rainwater.
【００２８】 請求項４記載の発明によれば、保護管１
４における内部のセンサーケーブル１３の固着は、セン
サーケーブル１３が動かないように、保護管１４を押し
つぶしてなるので、センサーケーブル１３の位置を簡単
に、しかも、確実に固定することができる。According to the invention of claim 4 , the protection tube 1
In order to fix the sensor cable 13 inside 4, the protective tube 14 is crushed so that the sensor cable 13 does not move. Therefore, the position of the sensor cable 13 can be fixed easily and surely.
【図１】本発明による斜面崩壊検知装置を切土法面１０
に設置した状態を示す斜視図である。FIG. 1 shows a slope failure detecting device according to the present invention, which is used as a cut slope 10
It is a perspective view showing the state installed in the.
【図２】本発明による斜面崩壊検知装置に設けた弱点部
１７の詳細な拡大正面図である。FIG. 2 is a detailed enlarged front view of a weak point portion 17 provided in the slope failure detection device according to the present invention.
【図３】本発明による斜面崩壊検知装置を支持杭１５に
固着した状態を示す平面図である。FIG. 3 is a plan view showing a state in which the slope failure detection device according to the present invention is fixed to a support pile 15.
【図４】本発明による斜面崩壊検知装置のセンサーケー
ブル１３が切断する原理を説明するためのもので、
（ａ）は、保護管１４がたわんだ状態の説明図、（ｂ）
は、切断までの伸びの計算式の説明図である。FIG. 4 is for explaining the principle of disconnection of the sensor cable 13 of the slope failure detection device according to the present invention,
(A) is explanatory drawing of the state where the protective tube 14 was bent, (b).
[Fig. 4] is an explanatory diagram of a calculation formula of elongation until cutting.
１０…切土法面、１１…盛土、１２…軌条、１３…セン
サーケーブル、１４…保護管、１５…支持杭、１６…連
結金具、１７…弱点部、１８…第１ライン、１９…第２
ライン、２０…芯線、２１…接合部、２２…シールド
網、２３…絶縁テープ、２４…シールドテープ、２５…
検知回路、２６…端末抵抗、２７…ケーブル固着部、２
８…固着リング、２９…固着リング、３０…ボルト、３
１…ナット。10 ... Cut slope, 11 ... Embankment, 12 ... Rail, 13 ... Sensor cable, 14 ... Protective tube, 15 ... Support pile, 16 ... Connecting metal fitting, 17 ... Weak point, 18 ... First line, 19 ... Second
Line, 20 ... Core wire, 21 ... Joining part, 22 ... Shield net, 23 ... Insulating tape, 24 ... Shield tape, 25 ...
Detection circuit, 26 ... Terminal resistance, 27 ... Cable fixing part, 2
8 ... Sticking ring, 29 ... Sticking ring, 30 ... Bolt, 3
1 ... nut.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平10−232147（ＪＰ，Ａ) 特開 平８−75506（ＪＰ，Ａ) 特公 平３−9247（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 17/20 G01D 21/00 ─────────────────────────────────────────────────── --Continued from the front page (56) References Japanese Patent Laid-Open No. 10-232147 (JP, A) Japanese Patent Laid-Open No. 8-75506 (JP, A) Japanese Patent Publication No. 3-9247 (JP, B2) (58) Field (Int.Cl. 7 , DB name) E02D 17/20 G01D 21/00
Claims (4)
１ライン（１８）、第２ライン（１９）を張設して閉回
路を構成するセンサーケーブル（１３）と、前記第１ラ
イン（１８）と第２ライン（１９）のうちの少なくとも
いずれか一方の途中に所定間隔で設けられる切断に対す
る弱点部（１７）と、前記センサーケーブル（１３）に
被せて保護する保護管（１４）と、この保護管（１４）
に、センサーケーブル（１３）における前記弱点部（１
７）を外した位置でセンサーケーブル（１３）を固着す
るケーブル固着部２７とからなり、前記弱点部（１７）
は、センサーケーブル（１３）を構成する複数本を束ね
た芯線（２０）の一部を切断したものからなることを特
徴とする斜面崩壊検知装置。1. A sensor cable (13) which forms a closed circuit by stretching at least two first lines (18) and second lines (19) at a sediment collapse monitoring position, and the first line (18). ) And a second line (19), at least one of which is provided with a predetermined interval in the middle thereof, and has a weak point (17) against cutting, and a protective tube (14) which covers and protects the sensor cable (13). This protective tube (14)
The weak point (1) in the sensor cable (13)
7) Ri Do from the cable fixing portion 27 for fixing the sensor cable (13) at a position removed, said weak portion (17)
Bundle the multiple cables that make up the sensor cable (13)
Core wire (20) slope failure detecting apparatus according to claim Rukoto such from those cut a part of.
（１３）を構成する複数本を束ねた芯線（２０）の一部
を露出し、この露出部分の近接した芯線（２０）の２個
所を接合部（２１）で一体的に接合し、これら２個所の
接合部（２１）の間の芯線（２０）の一部を切断してな
ることを特徴とする請求項１記載の斜面崩壊検知装置。2. The weak point (17) exposes a part of a core wire (20) that bundles a plurality of wires constituting the sensor cable (13), and exposes two parts of the core wire (20) adjacent to the exposed portion. The slope collapse detecting device according to claim 1, wherein the joint portion (21) is integrally joined, and a part of the core wire (20) between the two joint portions (21) is cut. .
７）の形成後にシールドテープ（２４）で被覆してなる
ことを特徴とする請求項２記載の斜面崩壊検知装置。3. The exposed portion of the core wire (20) is a weak point (1).
The slope failure detection device according to claim 2, wherein the device is covered with a shield tape (24) after forming 7).
ケーブル（１３）の固着は、センサーケーブル（１３）
が動かないように、保護管（１４）を押しつぶしてなる
ことを特徴とする請求項１記載の斜面崩壊検知装置。4. The sensor cable (13) is fixed to the inside of the protective tube (14) by fixing the sensor cable (13) inside the protective tube (14).
The slope failure detection device according to claim 1, wherein the protection tube (14) is crushed so that the movement does not occur.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001052203A JP3501400B2 (en) | 2001-02-27 | 2001-02-27 | Slope failure detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001052203A JP3501400B2 (en) | 2001-02-27 | 2001-02-27 | Slope failure detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002250037A JP2002250037A (en) | 2002-09-06 |
| JP3501400B2 true JP3501400B2 (en) | 2004-03-02 |
Family
ID=18912870
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001052203A Expired - Lifetime JP3501400B2 (en) | 2001-02-27 | 2001-02-27 | Slope failure detection device |
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| Country | Link |
|---|---|
| JP (1) | JP3501400B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100814470B1 (en) | 2007-08-10 | 2008-03-17 | (주)바이텍코리아 | System and method for monitoring debris flow landslides |
| JP5977903B1 (en) * | 2015-03-17 | 2016-08-24 | 有限会社インパクト | Earth and sand disaster detection system |
| CN109024527B (en) * | 2018-06-15 | 2020-10-13 | 中铁西安勘察设计研究院有限责任公司 | Method for embedding and later maintenance of internal sensor in roadbed dynamic response test |
-
2001
- 2001-02-27 JP JP2001052203A patent/JP3501400B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JP2002250037A (en) | 2002-09-06 |
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