JPH01207514A - Displacement measurement of geo-textile installed in banking - Google Patents
Displacement measurement of geo-textile installed in bankingInfo
- Publication number
- JPH01207514A JPH01207514A JP3370088A JP3370088A JPH01207514A JP H01207514 A JPH01207514 A JP H01207514A JP 3370088 A JP3370088 A JP 3370088A JP 3370088 A JP3370088 A JP 3370088A JP H01207514 A JPH01207514 A JP H01207514A
- Authority
- JP
- Japan
- Prior art keywords
- embankment
- banking
- geo
- displacement
- geotextile
- 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.)
- Granted
Links
- 239000004746 geotextile Substances 0.000 title claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は、盛土中に敷設したジオテキスタイルのその
後の変位を測定するだめの方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a method for measuring the subsequent displacement of a geotextile laid in an embankment.
「従来の技術、発明が解決せんとする問題点」一般に１
強度的に弱い盛土においては、第６図に示すようにｆめ
盛土中にプラスチックの多孔板或いは不織布等からなる
ジオテキスタイルを埋設し、盛土のすべりに対してジオ
テキスタイルと上との庁擦力及びジオテキスタイルの引
張力により抵抗させることによって補強し、盛土のすべ
り破壊を防１トするようにしている。“Prior art, problems that the invention attempts to solve” Generally 1
For embankments with weak strength, as shown in Figure 6, geotextiles made of perforated plastic plates or non-woven fabrics are buried in the embankment to prevent the sliding of the embankment from occurring due to the frictional force between the geotextile and the top. This is reinforced by resisting the tensile force of the embankment to prevent sliding failure of the embankment.
ところて、このジオテキスタイルも盛土のすべりの進行
と共に次第にそのすべり方向に伸びを増進し、引張限度
においては破断して補強効果を失う危険かあり、盛土の
すべり状況を観察する意味でもジオテキスタイルの伸び
を長期的に計？Ｉ１６ シて把握しておく必要かある。However, as the embankment slides, this geotextile gradually increases its elongation in the sliding direction, and there is a risk that it will break at the tensile limit and lose its reinforcing effect. Total in the long term? I16 Is there a need to understand this?
このようなジオテキスタイルの測定方法として従来、ジ
オテキスタイルがプラスチックの多孔板である場合には
、その複数箇所に歪ゲージを貼着して盛土外部まで配線
し、切換器を介して測定器により各歪ゲージの歪を計測
することにより、伸びを測定する方法か実施されている
か、ト中水により絶縁か落ちるため、長期計測か困難で
、２％以上の大きな歪は計４１１１することかてきず、
しかも測定器及び切換器を要するため、設備費かかかり
、費用をかける割には実用性に乏しいという欠点かあっ
た。Conventionally, when the geotextile is a perforated plastic plate, strain gauges are attached to multiple locations on the geotextile and wired to the outside of the embankment, and each strain gauge is connected to the measuring device via a switching device. Is there a method to measure elongation by measuring the strain of the steel? Because the insulation deteriorates due to water in the tube, long-term measurement is difficult, and large strains of 2% or more can result in a total of 4111.
Moreover, since a measuring device and a switching device are required, the equipment costs are high, and there is a drawback that it is not practical considering the cost.
また、ジオテキスタイルか不織布である場合には、その
複数箇所に変位計を取付けて盛土外部まて配線し、切換
器を介して測定器により各変位計の変位を計測すること
により、伸びを測定する方法か実施されているか、変位
計とコードの結線部分か断線し易く、変位計自体の強度
も弱いため故障か多く、しかも測定器及び切換器を要す
るため、設備費かかかり、歪ケージと同様に費用をかけ
る割には実用性に乏しいという欠点かあった。In addition, if the material is geotextile or non-woven fabric, elongation can be measured by installing displacement meters at multiple locations, wiring it to the outside of the embankment, and measuring the displacement of each displacement meter with a measuring device via a switch. The connection between the displacement meter and the cord is easy to break, and the strength of the displacement meter itself is weak, resulting in frequent failures.Furthermore, it requires a measuring device and a switching device, which increases equipment costs, and is similar to strain cages. The drawback was that it was not very practical considering the cost involved.
「問題点を解決するための手段」
この発明は前記従来の課題を解決するために、盛土時に
敷設したジオテキスタイルに、盛土のすべり方向に配置
した少なくとも２１本のロウｌ〜の後端を予め一定間距
離を首いて固定すると共に、各ロフトの先端部を盛土前
面に突出させて置き、盛土前面部に設置した測定基準に
対する各ロットの変位量を計３１１シてその差からシオ
デキスタイルの変位量を測定することにより、Δ！１定
装置として安価て耐久性のある設備て簡単に設置するこ
とができ、計測方法も簡単で大きな変位でもｆｌｌｌ＋
ｌｌｌ＋側定方法を提案するものである。"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention provides a method in which the rear ends of at least 21 rows l~ arranged in the sliding direction of the embankment are fixed at a certain level in advance on the geotextile laid during embankment. At the same time, the tip of each loft was placed so as to protrude in front of the embankment, and the displacement of each lot was measured by a total of 311 points with respect to the measurement standard set at the front of the embankment. From the difference, the displacement of the siodex tile was determined. By measuring the amount Δ! It is an inexpensive and durable equipment that can be easily installed as a single constant device, and the measurement method is simple, even with large displacements.
This paper proposes a method for determining the ll+ side.
「実施例」
以下この発明を図面に示す実施例につい′Ｃ説明すると
、盛土ｌの施工段階で敷設したジオテキスタイル２の所
要箇所に、盛±ｌのすべりかｔ想される方向に平行に配
した鋼線等からなる少なくとも２本のロッド３ａ、３ｂ
の後端を所定距離だけ離して固定する。``Embodiment'' To explain the embodiment of the present invention shown in the drawings below, geotextile 2, which was laid during the construction stage of embankment 1, was placed at required locations parallel to the direction in which the sliding of embankment 1 is expected. At least two rods 3a, 3b made of steel wire etc.
Fix the rear ends of the two at a specified distance apart.
また、ロット３ａ、３ｂに沿ってロット３ｃを配置し、
その後端部をアンカー４により盛土流下部後方の不動地
盤に固定する。In addition, lot 3c is arranged along lots 3a and 3b,
The rear end is fixed to the immovable ground behind the lower part of the embankment using an anchor 4.
盛１ｚｌの前面の法肩には、４Ｉ一定台盤５をそのＦ力
に突１没した固定アンカー６を地中に打込むことにより
固定し、盛上工の前面から突出した先端に板等からなる
複数の測定基１！Ｆ！７を横方向に並設し、これらの間
に盛上ｌの前方に露出させた各ロット３ａ、３ｂ、３ｃ
の先端部を嵌挿する。On the shoulder of the front of the embankment 1zl, fix the 4I fixed base plate 5 by driving the fixed anchor 6 into the ground, which was sunk by the F force, and attach a board, etc. to the tip protruding from the front of the embankment. A plurality of measurement bases consisting of 1! F! 7 are arranged side by side in the horizontal direction, and each lot 3a, 3b, 3c is exposed in front of the embankment L between them.
Insert the tip of the
各ロッド３ａ、３ｂ、３ｃは、測定基準７から後方の部
分を塩化ビニール等のプラスチラフからなるパイプ８及
び継手パイプ８′により包被し、土砂との摩擦が作用し
ないように縁切する。Each of the rods 3a, 3b, and 3c is covered with a pipe 8 made of plasticaf such as vinyl chloride and a joint pipe 8' at the rear portion from the measurement standard 7, and the edges are cut to prevent friction with earth and sand.
継手パイプ８′はパイプ８よりも径が大きく形成され、
所要箇所にＪいてパイプ８の端部に多少オーバーラツプ
させてスライド自在に接続することにより、盛土１のす
べりに追従してパイプ８が伸張するようになっている。The joint pipe 8' is formed to have a larger diameter than the pipe 8,
The pipe 8 is made to expand following the sliding of the embankment 1 by connecting the pipe 8 at a required location so as to overlap the end of the pipe 8 so as to be slidable.
各ロット３ａ、３ｂ、３ｃは第３〜５図に示すように、
ジオテキスタイル２を上下から挟んでボルト締めした上
下の固体板９，９゛の一方に端部をねし込んて固定する
。Each lot 3a, 3b, 3c is as shown in Figs.
The geotextile 2 is fixed by screwing the end into one of the upper and lower solid plates 9, 9' which are clamped with bolts from above and below.
このようにして各ロット３ａ、３ｂ、３ｃを予め盛土１
中に埋設設置した状態におい°Ｃ，盛上１にすべりを生
し、このときの土砂との摩擦によりジオテキスタイル２
に伸びを生した場合、これに応してロット３ａ、３ｂは
先端方向に移動すると同時に、盛土ｌのすべりによって
前面の７１１１１定台盤５もすべり方向に迫り出し、そ
の先端のΔＩＩＩ定基準７を移動させることになる。In this way, each lot 3a, 3b, 3c is filled with embankment 1 in advance.
When the geotextile 2 is buried in the ground, slippage occurs on the embankment 1, and friction with the earth and sand causes the geotextile 2 to slip.
When elongation occurs, the lots 3a and 3b move in the tip direction accordingly, and at the same time, the 71111 fixed base plate 5 in the front also protrudes in the sliding direction due to the sliding of the embankment l, and the ΔIII fixed standard 7 at the tip will be moved.
このとき、測定基準７の移動量に比べてジオテキスタイ
ル２の伸びは小さいことから、ロッド３ａ、３ｂの先端
などの基準点と測定基準７との間の距離は初期値よりも
減少し、この両者の測定基準７からの距離をノギス、物
差、コンベックス等により計測して、第１図に示す区間
Ａ、Ｂの各減少量（△Ｌｌ、ΔＬ２）の差を計算するこ
とにより、その差（△Ｌ２−ΔＬ、）からジオテキスタ
イル２の伸び量（変位量）を知ることかてきる。At this time, since the elongation of the geotextile 2 is small compared to the amount of movement of the measurement standard 7, the distance between the reference points such as the tips of the rods 3a, 3b and the measurement standard 7 decreases from the initial value, and both By measuring the distance from the measurement standard 7 using calipers, rulers, convexes, etc., and calculating the difference in the amount of decrease (ΔLl, ΔL2) in sections A and B shown in FIG. 1, the difference ( The amount of elongation (displacement) of the geotextile 2 can be determined from ΔL2−ΔL, ).
また、ロフト３ｃにおける先端などの基準点と１１１１
定基準７との間の距離の減少量△Ｌ３を計測することに
より、盛土ｌのすべりによる前面の水平変位を知ること
かてきる。In addition, the reference point such as the tip of the loft 3c and 1111
By measuring the amount of decrease ΔL3 in the distance from the fixed reference 7, it is possible to know the horizontal displacement of the front surface due to the sliding of the embankment l.
「発明の効果」
以−ヒの通りこの発明によれば、盛土時に敷設したジオ
テキスタイルに、盛土のすべり方向に配置した少なくと
も２木のロッドの後端を予め一定間距離を置いて固定す
ると共に、各ロフトの先端部を盛土前面に突出させて置
き、盛土前面部に設置した測定基準に対する各ロッドの
変位量を計測してその差からジオテキスタイルの変位量
を測定するので、電気機器を要することなく鋼線等を用
いて安価で耐久性に優れた測定装置を簡単に設置するこ
とかてき、長期の計測が可能となると共に、計測方法も
ロフト先端の長さを計測するたけてよいため極めて簡単
て、しかも大きな変位でも測定することがてきる。"Effects of the Invention" As described below, according to this invention, the rear ends of at least two wooden rods arranged in the sliding direction of the embankment are fixed at a certain distance to the geotextile laid during embankment, and The tip of each loft is placed protruding from the front of the embankment, and the displacement of each rod is measured with respect to the measurement standard set on the front of the embankment.The displacement of the geotextile is measured from the difference, so there is no need for electrical equipment. It is possible to easily install an inexpensive and highly durable measuring device using steel wire, etc., which enables long-term measurement, and the measurement method is extremely simple as it can be used to measure the length of the tip of the loft. Moreover, even large displacements can be measured.
第１図はこの発明の測定原理を示す概要図、第２図はこ
の発明に用いる装置の斜視図、第３図はこの発明に係る
ロットの固定部を示す縦断側面図、第４図は同平面図、
第５図は同正面図、第６図は盛土の縦断面図である。
１・・盛土、２・・ジオテキスタイル、３ａ、３ｂ、３
ｃ・・ロッ１−１４・・アンカー、５・・ΔＩＩＩ定台
盤、６・・固定アンカー、７・・ΔＩＩＩ定基準、８・
・パイプ、８“ ・・継手パイプ、９，９′ ・・固定
板。Fig. 1 is a schematic diagram showing the measurement principle of this invention, Fig. 2 is a perspective view of the device used in this invention, Fig. 3 is a longitudinal side view showing the fixing part of the lot according to this invention, and Fig. 4 is the same. Plan view,
FIG. 5 is a front view of the same, and FIG. 6 is a longitudinal cross-sectional view of the embankment. 1. Embankment, 2. Geotextile, 3a, 3b, 3
c...Lot 1-14...Anchor, 5...∆III fixed base plate, 6...Fixed anchor, 7...∆III fixed standard, 8...
・Pipe, 8"...Joint pipe, 9,9'...Fixing plate.
Claims (1)
り方向に配置した少なくとも２本のロッドの後端を予め
一定間距離を置いて固定すると共に、前記ロッドの先端
部を盛土前面に突出させて置き、前記盛土前面部に設置
した測定基準に対する前記各ロッドの変位量を計測して
その差からジオテキスタイルの変位量を測定することを
特徴とする盛土中に敷設したジオテキスタイルの変位測
定方法。1) The rear ends of at least two rods arranged in the sliding direction of the embankment are fixed at a certain distance to the geotextile laid during embankment, and the tips of the rods are placed so as to protrude in front of the embankment, A method for measuring the displacement of a geotextile laid in an embankment, the method comprising: measuring the amount of displacement of each of the rods with respect to a measurement standard installed in the front part of the embankment, and measuring the amount of displacement of the geotextile from the difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3370088A JPH0826535B2 (en) | 1988-02-16 | 1988-02-16 | Displacement measuring method of geotextile laid in embankment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3370088A JPH0826535B2 (en) | 1988-02-16 | 1988-02-16 | Displacement measuring method of geotextile laid in embankment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01207514A true JPH01207514A (en) | 1989-08-21 |
| JPH0826535B2 JPH0826535B2 (en) | 1996-03-13 |
Family
ID=12393693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3370088A Expired - Fee Related JPH0826535B2 (en) | 1988-02-16 | 1988-02-16 | Displacement measuring method of geotextile laid in embankment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0826535B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014091933A (en) * | 2012-11-01 | 2014-05-19 | Nishi Nippon Spc Kk | Embankment structure and construction method for the same |
-
1988
- 1988-02-16 JP JP3370088A patent/JPH0826535B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014091933A (en) * | 2012-11-01 | 2014-05-19 | Nishi Nippon Spc Kk | Embankment structure and construction method for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0826535B2 (en) | 1996-03-13 |
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