JPH1123393A - Closed type gap water pressure measuring apparatus - Google Patents
Closed type gap water pressure measuring apparatusInfo
- Publication number
- JPH1123393A JPH1123393A JP18922297A JP18922297A JPH1123393A JP H1123393 A JPH1123393 A JP H1123393A JP 18922297 A JP18922297 A JP 18922297A JP 18922297 A JP18922297 A JP 18922297A JP H1123393 A JPH1123393 A JP H1123393A
- Authority
- JP
- Japan
- Prior art keywords
- pressure sensor
- filter
- water
- wedge
- ground
- 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
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、地盤中に発生する
間隙水圧の変化を測定するための装置に関し、更に詳し
く述べると、ボーリング孔内に挿入したスタンドパイプ
内において、その下方に設けた圧力センサと地下水位と
の間の連通を、楔型パッカーで遮断することにより密閉
構造とし、非測定時には圧力センサを引き抜き可能とし
た密閉型間隙水圧測定装置に関するものである。この装
置は、特に地震時の動的間隙水圧の測定に有用である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a change in pore water pressure generated in the ground, and more particularly, to a stand pipe inserted into a borehole and provided with a pressure provided below the same. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed pore water pressure measurement device in which communication between a sensor and a groundwater level is closed by blocking it with a wedge-shaped packer and a pressure sensor can be pulled out when measurement is not performed. This device is particularly useful for measuring dynamic pore pressure during an earthquake.
【０００２】[0002]
【従来の技術】地震時に地盤中に発生する異常な間隙水
圧は、地盤の流動化や斜面の崩壊などを惹起する要因と
なるものであり、その測定は地震災害の防止や災害後の
処置のために極めて重要である。現在、一般的に用いら
れている方法は、間隙水圧計を地盤中に封入して間隙水
圧を測定する方法である。2. Description of the Related Art Abnormal pore water pressure generated in the ground during an earthquake is a factor that causes fluidization of the ground and collapse of slopes, and its measurement is used to prevent earthquake disasters and to take measures after disasters. Is extremely important for. Currently, a commonly used method is to measure a pore water pressure by sealing a pore water pressure gauge in the ground.
【０００３】地震が起きると地下水の水圧変化が生じ、
これを測定することで地盤の流動化の測定が可能であ
る。地盤の流動化とは、地盤の砂状物質が動き、砂粒子
同士が緩く結合していた状態から密な状態になることで
あり、これによって圧力が上昇するからである。小さな
地震が発生した時に、どのような間隙水圧が観測される
かを調査することによって、流動化が起きる地盤である
か否か、どの程度の規模の地震で噴砂・流動化が生じる
かなどを予測する手掛かりが得られる。そこで、測定の
結果、緩い砂で流動化し易い地盤であることが判明した
場合には、グラウトを施すなどの予防対策を行うこと
で、地震による被害を最小限に止めることが可能とな
る。When an earthquake occurs, groundwater pressure changes,
By measuring this, the fluidization of the ground can be measured. The fluidization of the ground means that the sand-like substance on the ground moves and changes from a state in which the sand particles are loosely bound to a dense state, thereby increasing the pressure. By investigating what kind of pore water pressure is observed when a small earthquake occurs, it is possible to determine whether it is the ground where fluidization occurs, and how large the earthquake will cause sand and fluidization. Get clues to make predictions. Therefore, if the measurement shows that the ground is easily ground with loose sand, it is possible to minimize damage caused by the earthquake by taking preventive measures such as grouting.
【０００４】[0004]
【発明が解決しようとする課題】地震時の間隙水圧は、
振動と共に変化するものであり、動的な変化である。従
って、その測定は開放されたボーリング孔では行えず、
所定の砂層の深度に間隙水圧計（圧力センサ）を埋設す
る方式が採用されていた。地震は何時発生するかは分か
らないから、圧力センサは長期間にわたって埋設したま
まにしておく必要がある。そのため圧力センサは故障す
る恐れがあり、もし故障した場合にはメンテナンスは不
可能である。故障発生時には新たにボーリング孔を掘削
して、圧力センサを埋設しなければならず、不便であ
り、且つ不経済であった。The pore water pressure during an earthquake is
It changes with vibration and is a dynamic change. Therefore, the measurement cannot be performed on an open borehole,
A method of burying a pore water pressure gauge (pressure sensor) at a predetermined depth of the sand layer has been adopted. Since it is not known when an earthquake will occur, the pressure sensor must be left buried for a long time. Therefore, the pressure sensor may fail, and if it fails, maintenance is not possible. When a failure occurs, it is necessary to dig a new borehole and bury a pressure sensor, which is inconvenient and uneconomical.
【０００５】本発明の目的は、密閉式でありながら、地
中に挿入した圧力センサなどのメンテナンスを容易に行
える間隙水圧測定装置を提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a pore water pressure measuring device which can be easily maintained while maintaining a sealed type pressure sensor and the like.
【０００６】[0006]
【課題を解決するための手段】本発明は、地盤中に掘削
したボーリング孔内の底部に筒状のフィルタを設置する
と共に、該フィルタから地上まで達する水密性のスタン
ドパイプを立設し、前記スタンドパイプの下方に該スタ
ンドパイプ内の水頭を測定するための圧力センサを組み
込み、該圧力センサから地上まで達する信号ケーブルを
挿通し、前記フィルタとボーリング孔壁との間に透水性
物質を充填すると共に、該透水性物質の上部を遮水性物
質で覆って埋設した間隙水圧測定装置である。ここで、
前記圧力センサが挿通可能な逆円錐台状の開口部を有し
前記スタンドパイプ内に固定された受け部材と、弾性体
からなり該受け部材の開口部に嵌合可能な逆円錐台形状
をなし中心に貫通穴を有する楔型パッカーと、下端が該
楔型パッカーに固定され上端が地上まで達する保持パイ
プと、該保持パイプの上端部を押さえることが可能な押
し込み治具と、前記楔型パッカーの貫通穴に挿入されて
密接し且つ前記信号ケーブルが内部を挿通た状態で両端
を封止可能な遮水筒とを具備しており、その点に本発明
の特徴がある。この構成によって、測定時には楔型パッ
カーによって前記フィルタの上部を封止可能とすると共
に、メンテナンス必要時には圧力センサを引き抜けるよ
うになっている。According to the present invention, a tubular filter is installed at the bottom of a boring hole excavated in the ground, and a water-tight stand pipe extending from the filter to the ground is erected. A pressure sensor for measuring a water head in the stand pipe is incorporated below the stand pipe, a signal cable extending from the pressure sensor to the ground is inserted, and a water permeable material is filled between the filter and the borehole wall. In addition, a pore water pressure measurement device is provided in which the upper part of the water permeable material is covered with a water shielding material and buried. here,
A receiving member fixed in the stand pipe having an inverted frustoconical opening through which the pressure sensor can be inserted, and an inverted frustoconical shape formed of an elastic body and capable of fitting into the opening of the receiving member. A wedge-shaped packer having a through hole at the center, a holding pipe having a lower end fixed to the wedge-shaped packer and an upper end reaching the ground, a pushing jig capable of pressing an upper end of the holding pipe, and the wedge-shaped packer And a water-tight cylinder that can be sealed at both ends with the signal cable inserted in the through hole and tightly closed and the inside of the signal cable inserted therethrough, which is a feature of the present invention. With this configuration, the upper portion of the filter can be sealed by a wedge-shaped packer during measurement, and the pressure sensor can be pulled out when maintenance is required.
【０００７】[0007]
【発明の実施の形態】信号ケーブルは、保持パイプの内
部を挿通させるのが好ましいが、保持パイプに沿って地
上まで引き出してもよい。受け部材は、必ずしも弾性体
である必要はなく金属製あるいはプラスチックス製とし
てもよいが、受け部材及び楔型パッカーともに弾性体と
してもよい。例えば、耐食性のあるゴムなどの成形体が
好適である。押し込み治具は、保持パイプの上端部を押
さえると共に、例えばスタンドパイプの上端にねじ込み
可能な構造とする。それによって保持パイプ下端の楔型
パッカーを受け部材に押し付けると共に、該楔型パッカ
ーの弾性変形で遮水筒を挾圧することで楔型パッカー貫
通孔内面と遮水筒外周面との隙間を無くすことができ
る。BEST MODE FOR CARRYING OUT THE INVENTION A signal cable is preferably inserted through the inside of a holding pipe, but may be drawn to the ground along the holding pipe. The receiving member does not necessarily have to be an elastic body and may be made of metal or plastics, but both the receiving member and the wedge-shaped packer may be made of an elastic body. For example, a molded article such as rubber having corrosion resistance is suitable. The pushing jig has a structure that can hold the upper end of the holding pipe and can be screwed into the upper end of the stand pipe, for example. Accordingly, the wedge-shaped packer at the lower end of the holding pipe is pressed against the receiving member, and the water-tight cylinder is pressed by the elastic deformation of the wedge-shaped packer, whereby the gap between the inner surface of the through hole of the wedge-shaped packer and the outer peripheral surface of the water-tight cylinder can be eliminated. .
【０００８】[0008]
【実施例】図１は本発明に係る密閉型間隙水圧測定装置
の一実施例の測定時の説明図であり、図２はそのメンテ
ナンス必要時における圧力センサ等を引き抜いた状態を
示す説明図である。FIG. 1 is an explanatory view at the time of measurement of an embodiment of a closed pore water pressure measuring apparatus according to the present invention, and FIG. 2 is an explanatory view showing a state where a pressure sensor and the like are pulled out when maintenance is necessary. is there.
【０００９】長尺で水密性のスタンドパイプ１０の下端
に有底円筒状のフィルタ１２を装着し、地盤中に掘削し
たボーリング孔１４内に挿入する。ボーリング孔１４に
は予め途中までケーシングパイプ１６を挿入しておき、
それによって孔壁の崩壊を防ぐ。フィルタ１２は、地下
水の自由な出入は許容されているが、砂など固体粒子の
流入は阻止できる構造である。このフィルタ１２は、前
記ボーリング孔１４の底部に設置され、前記スタンドパ
イプ１０は、フィルタ１２上端から地上まで達する長さ
とする。そして、前記フィルタ１２とボーリング孔１４
の壁面との間隙に砂などの透水性物質１８を充填し、該
透水性物質１８の上部をベントナイトなどの遮水性物質
２０で覆って埋設する。なお遮水性物質２０は、ケーシ
ングパイプ１６の下端部まで埋まるように設ける。A bottomed cylindrical filter 12 is attached to the lower end of a long watertight standpipe 10 and inserted into a borehole 14 excavated in the ground. The casing pipe 16 is inserted in advance into the boring hole 14 halfway,
This prevents the collapse of the hole wall. The filter 12 has a structure that allows free inflow and outflow of groundwater, but can prevent inflow of solid particles such as sand. The filter 12 is installed at the bottom of the boring hole 14, and the stand pipe 10 has a length extending from the upper end of the filter 12 to the ground. The filter 12 and the boring hole 14
Is filled with a water-permeable substance 18 such as sand, and the upper part of the water-permeable substance 18 is covered with a water-blocking substance 20 such as bentonite and buried. The water-impervious substance 20 is provided so as to fill up to the lower end of the casing pipe 16.
【００１０】前記スタンドパイプ１０内の下方（フィル
タ１２の内部）に該スタンドパイプ１０内の水頭を測定
する圧力センサ２２を設けておく。該圧力センサ２２か
らの検出信号は、信号ケーブル２４によって地上の圧力
測定器２６に導き、常時圧力を測定できるようにする。
圧力測定器２６は、測定値を測定時刻とともに記録し続
け、必要に応じてチャートに出力したり、遠隔の基地に
情報伝送できるように構成する。A pressure sensor 22 for measuring the water head in the stand pipe 10 is provided below the stand pipe 10 (inside the filter 12). The detection signal from the pressure sensor 22 is guided to a pressure measuring device 26 on the ground by a signal cable 24 so that the pressure can be constantly measured.
The pressure measuring device 26 is configured to continuously record the measured value together with the measurement time, output it to a chart as needed, and transmit information to a remote base.
【００１１】さて本発明では、スタンドパイプ１０内の
下端部（フィルタ１２の上方）に、前記圧力センサ２２
が挿通可能な逆円錐台状の開口部を有する受け部材３０
を、ねじ筒３４とナット３６により緊締固定する。そし
て受け部材３０の開口部の小径部側（下端側）の内径、
厳密にはねじ筒３４を用いて固定しているので、ねじ筒
３４の内径を圧力センサ２２の外径よりも大きくしてお
く。受け部材３０は金属製などでもよいが、ここでは耐
食性を有する弾性体、例えばゴム成形体からなる。In the present invention, the pressure sensor 22 is provided at a lower end portion (above the filter 12) in the stand pipe 10.
Member 30 having an inverted truncated cone-shaped opening through which can be inserted
Is tightly fixed with a screw cylinder 34 and a nut 36. And the inner diameter of the small diameter portion side (lower end side) of the opening of the receiving member 30,
Strictly, the screw cylinder 34 is used for fixing, so that the inner diameter of the screw cylinder 34 is larger than the outer diameter of the pressure sensor 22. The receiving member 30 may be made of metal or the like, but is made of an elastic body having corrosion resistance, for example, a rubber molded body.
【００１２】この受け部材３０と、その開口部に丁度嵌
合するような逆円錐台形状をなす楔型パッカー４０を組
み合わせる。楔型パッカー４０は、耐食性を有する弾性
体、例えば受け部材と同材質のゴム成形体からなり、中
心に貫通穴４２を有する構造である。なお、この実施例
では、貫通孔４２の口径は前記圧力センサ２２の外径よ
り若干大きめに設定している。この楔型パッカー４０
は、保持パイプ４４の下端にナット４６で固定されてお
り、該保持パイプ４４は、上端が地上まで達するような
長さとする。保持パイプ４４の上端部には、係止用突起
４８を固着しておく。This receiving member 30 is combined with a wedge-shaped packer 40 having an inverted truncated cone shape just fitted into the opening thereof. The wedge-shaped packer 40 is made of an elastic body having corrosion resistance, for example, a rubber molded body of the same material as the receiving member, and has a structure having a through hole 42 at the center. In this embodiment, the diameter of the through hole 42 is set slightly larger than the outer diameter of the pressure sensor 22. This wedge-shaped packer 40
Is fixed to a lower end of a holding pipe 44 with a nut 46, and the holding pipe 44 has a length such that an upper end reaches the ground. At the upper end of the holding pipe 44, a locking projection 48 is fixed.
【００１３】楔型パッカー４０の貫通孔４２に遮水筒５
０を挿入する。該遮水筒５０は、図３に詳細に示すよう
に、円筒体の上下両端部が半球状に括れた形状で、その
細径端部にそれぞれゴムスリーブ５２を装着し、下方に
位置する圧力センサ２２からの信号ケーブル２４がゴム
スリーブ５２及び遮水筒５０を貫通し、保持パイプ４４
の内部を通って地上の圧力測定器２６に接続されるよう
に構成する。The water impervious cylinder 5 is inserted into the through hole 42 of the wedge-shaped
Insert 0. As shown in detail in FIG. 3, the upper and lower ends of the cylindrical body are hemispherically confined, and rubber sleeves 52 are attached to their narrow ends, respectively. The signal cable 24 from the cable 22 penetrates through the rubber sleeve 52 and the water-barrier 50 and the holding pipe 44
To be connected to a pressure measuring instrument 26 on the ground through the inside of the device.
【００１４】更に、保持パイプ４４を下方に押さえる押
し込み治具６０を設ける。押し込み治具６０は、中央に
貫通穴を有し、外周内面にねじ部を形成したキャップ状
部材であり、前記貫通穴の周囲が保持パイプ４４の係止
用突起４８の上面に当接し、ねじ部がスタンドパイプ１
０の上端部のねじ部に螺合する構造である。Further, a pushing jig 60 for holding down the holding pipe 44 is provided. The pushing jig 60 is a cap-shaped member having a through hole in the center and a threaded portion formed on the inner surface of the outer periphery. The periphery of the through hole contacts the upper surface of the locking projection 48 of the holding pipe 44, The part is a stand pipe 1
It is a structure that is screwed into the screw portion at the upper end of the zero.
【００１５】本装置の設置方法及び使用方法は次の如く
である。図２に示すように、下端にフィルタ１２を装着
し、下端内側に受け部材３０を固定したスタンドパイプ
１０をボーリング孔１４内に挿入し、前記フィルタ１２
の周囲に透水性物質１８を充填し、その上に遮水性物質
２０を設けて埋設固定する。The method of installing and using the apparatus is as follows. As shown in FIG. 2, the filter 12 is attached to the lower end, and the stand pipe 10 having the receiving member 30 fixed inside the lower end is inserted into the boring hole 14.
Is filled with a water-permeable substance 18, and a water-blocking substance 20 is provided thereon to be embedded and fixed.
【００１６】次に、下端に楔型パッカー４０を固定した
保持パイプ４４を、前記スタンドパイプ１０内に挿入す
る。その際、予め楔型パッカー４０の貫通孔４２の位置
に遮水筒５０が挿入されるように、圧力センサ２２から
の信号ケーブル２４を挿通しておく。受け部材３０の開
口部は、圧力センサ２２の外径よりも大きく設定してあ
るので、圧力センサ２２は、受け部材３０の開口部（厳
密にはねじ筒３４）を通過してフィルタ１２内に収ま
る。そして、楔型パッカー４０は受け部材３０に嵌まり
込む。その状態で、押し込み治具６０をスタンドパイプ
１０に対してねじ込むと、係止用突起４８に当たって保
持パイプ４４は更に押し下げられる。これによって楔型
パッカー４０の外面は受け部材３０に密着し、同時に内
側にも膨らむように変形して遮水筒５０を挾圧し、その
外周面と楔型パッカー４０の貫通穴４２の内面との隙間
が無くなる。また遮水筒５０の括れた細径端部に装着さ
れているゴムスリーブ５２は、周囲の地下水による水圧
によって縮径し、信号ケーブル２４に密着する。このよ
うにして、フィルタ１２の上部は、完全に遮水されるこ
とになり、圧力センサ２２は地盤中に埋設されたと同様
の状態となる。そのため、地震による動的間隙水圧の測
定が可能となる。Next, the holding pipe 44 having the wedge-shaped packer 40 fixed to the lower end is inserted into the stand pipe 10. At that time, the signal cable 24 from the pressure sensor 22 is inserted in advance so that the water-blocking cylinder 50 is inserted into the position of the through hole 42 of the wedge-shaped packer 40 in advance. Since the opening of the receiving member 30 is set to be larger than the outer diameter of the pressure sensor 22, the pressure sensor 22 passes through the opening of the receiving member 30 (strictly, the screw cylinder 34) and enters the filter 12. Fits. Then, the wedge-shaped packer 40 fits into the receiving member 30. In this state, when the pushing jig 60 is screwed into the stand pipe 10, the holding pipe 44 is further pushed down against the locking projection 48. As a result, the outer surface of the wedge-shaped packer 40 comes into close contact with the receiving member 30, and at the same time, deforms so as to swell inward, thereby clamping the water-blocking cylinder 50. Disappears. The rubber sleeve 52 attached to the constricted small-diameter end of the water-blocking cylinder 50 is reduced in diameter by the water pressure due to the surrounding groundwater, and comes into close contact with the signal cable 24. In this way, the upper part of the filter 12 is completely impervious to water, and the pressure sensor 22 is in a state similar to that buried in the ground. Therefore, it is possible to measure the dynamic pore water pressure due to the earthquake.
【００１７】長期間にわたる使用によって圧力センサ２
２などに不具合が生じた場合には、押し込み治具６０を
外して保持パイプ４４を引き抜けばよい。すると、楔型
パッカー４０と共に水圧センサ２２を一体に引き上げる
ことができる。また、設計によっては、保持パイプ４４
を少し引き上げ、楔型パッカー４０を緩めた状態で信号
ケーブル２４を引き上げることで、遮水筒５０と圧力セ
ンサ２２のみを引き抜くことも可能である。いずれにし
ても、必要な修理あるいは交換を行った後、上記の手順
で、スタンドパイプ１０内に挿入すれば、再び圧力セン
サ２２を収容しているフィルタ１２の上部を遮水するこ
とができ、動的間隙水圧の測定が可能となる。By using the pressure sensor 2 for a long time,
In the case where a trouble occurs in 2 or the like, the pushing jig 60 may be removed and the holding pipe 44 may be pulled out. Then, the water pressure sensor 22 can be pulled up together with the wedge-shaped packer 40. Also, depending on the design, the holding pipe 44
It is also possible to pull out only the impermeable cylinder 50 and the pressure sensor 22 by slightly raising the signal cable 24 and raising the signal cable 24 with the wedge-shaped packer 40 loosened. In any case, after the necessary repair or replacement is performed, if the filter is inserted into the stand pipe 10 in the above procedure, the upper portion of the filter 12 containing the pressure sensor 22 can be blocked again. The measurement of the dynamic pore water pressure becomes possible.
【００１８】[0018]
【発明の効果】本発明は上記のように、スタンドパイプ
内側に受け部材を設け、それと嵌合可能な楔型パッカー
を保持パイプ下端に設けて圧力センサをフィルタ内に吊
設する構成としたことにより、圧力センサと地下水位と
の間の連通が、フィルタ上部にて楔型パッカーによって
遮断され、動的間隙水圧の測定が可能となる。しかも、
必要に応じて楔型パッカー及び圧力センサを引き抜くこ
とができるため、長期間にわたる使用によって故障など
の不具合が生じても、容易に修理や交換などのメンテナ
ンスが可能になる。そのため、故障発生時に新たにボー
リング孔を掘削する必要は無く、経済性にも優れたもの
となる。As described above, according to the present invention, the receiving member is provided inside the stand pipe, the wedge-shaped packer which can be fitted to the receiving member is provided at the lower end of the holding pipe, and the pressure sensor is suspended from the filter. Thereby, the communication between the pressure sensor and the groundwater level is blocked by the wedge-shaped packer at the upper part of the filter, and the measurement of the dynamic pore water pressure becomes possible. Moreover,
Since the wedge-shaped packer and the pressure sensor can be pulled out as needed, even if a problem such as a failure occurs due to long-term use, maintenance such as repair or replacement can be easily performed. For this reason, it is not necessary to newly drill a borehole when a failure occurs, and the economy is excellent.
【図１】本発明に係る密閉型間隙水圧測定装置の一実施
例の測定時における設置状況を示す説明図。FIG. 1 is an explanatory diagram showing an installation state at the time of measurement of one embodiment of a closed pore water pressure measuring device according to the present invention.
【図２】そのメンテナンス必要時における楔型パッカー
及び圧力センサ等の引き抜き状況を示す説明図。FIG. 2 is an explanatory diagram showing a state of pulling out a wedge-shaped packer, a pressure sensor, and the like when maintenance is required.
【図３】その遮水筒の一例を示す説明図。FIG. 3 is an explanatory view showing an example of the water-impervious cylinder.
１０ スタンドパイプ １２ フィルタ １４ ボーリング孔 １８ 透水性物質 ２０ 遮水性物質 ２２ 圧力センサ ２４ 信号ケーブル ３０ 受け部材 ４０ 楔型パッカー ４２ 貫通穴 ４４ 保持パイプ ５０ 遮水筒 ６０ 押し込み治具 REFERENCE SIGNS LIST 10 stand pipe 12 filter 14 boring hole 18 water-permeable substance 20 water-blocking substance 22 pressure sensor 24 signal cable 30 receiving member 40 wedge-shaped packer 42 through-hole 44 holding pipe 50 water-blocking cylinder 60 pushing jig
Claims (2)
に筒状のフィルタを設置すると共に、該フィルタから地
上まで達する水密性のスタンドパイプを立設し、前記ス
タンドパイプの下方に該スタンドパイプ内の水頭を測定
するための圧力センサを組み込み、該圧力センサから地
上まで達する信号ケーブルを挿通し、前記フィルタとボ
ーリング孔壁との間に透水性物質を充填すると共に、該
透水性物質の上部を遮水性物質で覆って埋設した間隙水
圧測定装置において、 前記圧力センサが挿通可能な逆円錐台状の開口部を有し
前記スタンドパイプ内に固定された受け部材と、弾性体
からなり該受け部材の開口部に嵌合可能な逆円錐台形状
をなし中心に貫通穴を有する楔型パッカーと、下端が該
楔型パッカーに固定され上端が地上まで達する保持パイ
プと、該保持パイプの上端部を押さえる押し込み治具
と、前記楔型パッカーの貫通穴に挿入されて外周面が密
接し且つ前記信号ケーブルが内部を挿通した状態で両端
を封止可能な遮水筒とを具備し、測定時に楔型パッカー
によって前記フィルタの上部を封止可能にすると共に、
メンテナンス必要時には圧力センサを引き抜き可能とし
たことを特徴とする密閉型間隙水圧測定装置。1. A tubular filter is installed at the bottom of a borehole excavated in the ground, and a watertight standpipe extending from the filter to the ground is erected, and the standpipe is provided below the standpipe. Incorporating a pressure sensor for measuring the water head inside, inserting a signal cable extending from the pressure sensor to the ground, filling the space between the filter and the borehole wall with a water-permeable material, and A pore-pressure measuring device embedded with a water-impervious material, wherein the receiving member comprises an inverted truncated cone-shaped opening through which the pressure sensor can be inserted and is fixed in the stand pipe; A wedge-shaped packer having an inverted truncated conical shape that can be fitted into the opening of the member and having a through hole at the center, and a lower end fixed to the wedge-shaped packer and an upper end held to the ground A pressing jig for holding the upper end of the holding pipe; a shielding jig which is inserted into a through hole of the wedge-shaped packer so that both ends can be sealed in a state where the outer peripheral surface is in close contact and the signal cable is inserted through the inside; A water bottle, and the top of the filter can be sealed by a wedge-shaped packer during measurement,
A closed pore water pressure measuring device characterized in that the pressure sensor can be pulled out when maintenance is required.
ムの成形体であり、押し込み治具は、保持パイプの上端
部を押さえると共に、スタンドパイプの上端にねじ込み
可能な構造であり、遮水筒は、上下両端部が括れた形状
で、その細径端部にゴムスリーブを装着して信号ケーブ
ルとの間を周囲の水圧で封止する構造の請求項１記載の
密閉型間隙水圧測定装置。2. The receiving member and the wedge-shaped packer are both formed of rubber. The pushing jig presses the upper end of the holding pipe and can be screwed into the upper end of the stand pipe. 2. The closed gap water pressure measuring device according to claim 1, wherein the closed upper and lower ends have a constricted shape, and a rubber sleeve is attached to a small-diameter end thereof to seal the space between the signal cable and the signal cable with surrounding water pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18922297A JP3892536B2 (en) | 1997-06-30 | 1997-06-30 | Sealed pore water pressure measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18922297A JP3892536B2 (en) | 1997-06-30 | 1997-06-30 | Sealed pore water pressure measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1123393A true JPH1123393A (en) | 1999-01-29 |
| JP3892536B2 JP3892536B2 (en) | 2007-03-14 |
Family
ID=16237626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18922297A Expired - Fee Related JP3892536B2 (en) | 1997-06-30 | 1997-06-30 | Sealed pore water pressure measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3892536B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100687630B1 (en) * | 2006-07-21 | 2007-02-27 | 주식회사 도화종합기술공사 | Ground packer test apparatus measuring porewater pressure at the hole |
| KR101003018B1 (en) | 2008-11-12 | 2010-12-22 | 이근호 | Measuring system and measuring method for water presure |
| JP2013209817A (en) * | 2012-03-30 | 2013-10-10 | Kunimine Industries Co Ltd | Impervious granulated substance for borehole |
| CN108414199A (en) * | 2017-12-29 | 2018-08-17 | 中国海洋石油集团有限公司 | Visualize the performance testing device of packing element |
| CN108442925A (en) * | 2018-06-20 | 2018-08-24 | 中国地质大学（北京） | A kind of hydraulic pressure water temperature intelligent device for measuring suitable for mine advance geologic prediction |
| CN109778975A (en) * | 2019-03-26 | 2019-05-21 | 杜龙虎 | A kind of squatting pan of easy blowdown |
| CN110398313A (en) * | 2019-09-04 | 2019-11-01 | 中国电建集团中南勘测设计研究院有限公司 | A kind of flowing pressure measuring device and method |
-
1997
- 1997-06-30 JP JP18922297A patent/JP3892536B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100687630B1 (en) * | 2006-07-21 | 2007-02-27 | 주식회사 도화종합기술공사 | Ground packer test apparatus measuring porewater pressure at the hole |
| KR101003018B1 (en) | 2008-11-12 | 2010-12-22 | 이근호 | Measuring system and measuring method for water presure |
| JP2013209817A (en) * | 2012-03-30 | 2013-10-10 | Kunimine Industries Co Ltd | Impervious granulated substance for borehole |
| CN108414199A (en) * | 2017-12-29 | 2018-08-17 | 中国海洋石油集团有限公司 | Visualize the performance testing device of packing element |
| CN108414199B (en) * | 2017-12-29 | 2020-05-22 | 中国海洋石油集团有限公司 | Performance testing device for visual packer rubber cylinder |
| CN108442925A (en) * | 2018-06-20 | 2018-08-24 | 中国地质大学（北京） | A kind of hydraulic pressure water temperature intelligent device for measuring suitable for mine advance geologic prediction |
| CN108442925B (en) * | 2018-06-20 | 2023-10-20 | 中国地质大学（北京） | Water pressure and water temperature intelligent measurement device suitable for advanced geological forecast of mine |
| CN109778975A (en) * | 2019-03-26 | 2019-05-21 | 杜龙虎 | A kind of squatting pan of easy blowdown |
| CN110398313A (en) * | 2019-09-04 | 2019-11-01 | 中国电建集团中南勘测设计研究院有限公司 | A kind of flowing pressure measuring device and method |
| CN110398313B (en) * | 2019-09-04 | 2024-05-14 | 中国电建集团中南勘测设计研究院有限公司 | Dynamic water pressure measuring device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3892536B2 (en) | 2007-03-14 |
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