JPH05148831A - Automatic measuring device for field permeability test - Google Patents

Automatic measuring device for field permeability test

Info

Publication number
JPH05148831A
JPH05148831A JP31699591A JP31699591A JPH05148831A JP H05148831 A JPH05148831 A JP H05148831A JP 31699591 A JP31699591 A JP 31699591A JP 31699591 A JP31699591 A JP 31699591A JP H05148831 A JPH05148831 A JP H05148831A
Authority
JP
Japan
Prior art keywords
water
test
marriott
trench
water level
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
Application number
JP31699591A
Other languages
Japanese (ja)
Other versions
JP2929562B2 (en
Inventor
Shogo Tsunenari
正吾 恒成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maeda Corp
Original Assignee
Maeda Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maeda Corp filed Critical Maeda Corp
Priority to JP31699591A priority Critical patent/JP2929562B2/en
Publication of JPH05148831A publication Critical patent/JPH05148831A/en
Application granted granted Critical
Publication of JP2929562B2 publication Critical patent/JP2929562B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

PURPOSE:To obtain a device automatically conducting a permeability test at the job site and recording the result of measurement. CONSTITUTION:A test trench 1 is supplied with water from a mariotte 5 through a hose 3 in order to keep the water level of the test trench 1 dug at the job site constant. Since pressure changes with the supply of water in the mariotte 5, the pressure is detected by a pressure gage 17. A detecting signal is amplified by an amplifier 21. The result of measurement is recorded by a recorder 23.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、土の透水試験を現場で
行うための装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for conducting a soil permeability test on site.

【0002】[0002]

【従来の技術】例えば、ロックフィルダムのコア部の品
質管理の一環として、コア部の土の透水試験を行うこと
がある。透水試験には、定水位透水試験や変水位透水試
験などがある。このうち現場で行う定水位透水試験は、
図2のように現場に堀られた試験トレンチ1の水位を一
定にするように、この試験トレンチ1へホース3を介し
てマリオット5から水を供給する。このマリオット5は
密閉された容器であり、水が満たされ、前記ホース3に
より試験トレンチ1内と連通している。密閉容器には大
気連通管7が貫通しており、この大気連通管7の下端は
前記試験トレンチ1の水面と同一レベルに位置される。
2. Description of the Related Art For example, as a part of quality control of the core portion of a rockfill dam, a soil water permeability test of the core portion is sometimes performed. Permeability tests include constant level permeability tests and variable level permeability tests. Of these, the constant water level permeability test conducted at the site is
Water is supplied from the marriott 5 to the test trench 1 via the hose 3 so that the water level of the test trench 1 dug in the field as shown in FIG. This marriott 5 is a sealed container, filled with water, and communicated with the inside of the test trench 1 by the hose 3. The air communication pipe 7 penetrates through the closed container, and the lower end of the air communication pipe 7 is positioned at the same level as the water surface of the test trench 1.

【0003】これにより、試験トレンチ1内の水位が減
少した場合にはホース3を介してマリオット5内の水が
供給され、マリオット5内には大気連通管7を介して大
気が供給される。このようにして試験トレンチ1内の水
位は一定に保たれる。そして、このように水位を一定に
保つ際に、前記ホース3を通って供給される水の量(透
水量)と、この供給が行われた時間との比などから透水
係数kcm/secを知ることができる。
As a result, when the water level in the test trench 1 decreases, the water in the marriott 5 is supplied via the hose 3, and the atmosphere is supplied to the marriott 5 via the air communication pipe 7. In this way the water level in the test trench 1 is kept constant. Then, when the water level is kept constant in this way, the water permeability coefficient kcm / sec is known from the ratio of the amount of water supplied through the hose 3 (water permeability) to the time when this water supply is performed. be able to.

【0004】[0004]

【発明が解決しようとする課題】しかしながら前記従来
技術によれば、試験に時間がかかり、例えばロックフィ
ルダムのコア部における透水試験には半日以上かかるも
のであった。その間、技術者がつききりになって、マリ
オットの水の減り具合いを1mm単位でスケールにより
読み取る作業をしていた。
However, according to the above-mentioned prior art, the test takes a long time, and for example, the water permeability test in the core portion of the rockfill dam takes more than half a day. During that time, an engineer was working hard to read out the water loss of Marriott at a scale of 1 mm.

【0005】本発明は以上の問題点を解決するためにな
されたもので、現場透水試験の自動化をはかり、透水量
を自動的に測定し記録することのできる現場透水試験自
動測定装置を提供することを目的とする。
The present invention has been made to solve the above problems, and provides an on-site water permeability test automatic measuring device capable of automatically measuring on-site water permeability test and automatically measuring and recording the amount of water permeability. The purpose is to

【0006】[0006]

【課題を解決するための手段】本発明は以上の目的を達
成するためになされたもので、現場で、定水位透水試験
を行う試験トレンチの水位を一定にするため、試験トレ
ンチへホースを介して水を供給するマリオットの内部の
圧力を検出する圧力計と、検出信号を増巾するための増
巾器と、結果を記録する記録計とを備えたものである。
The present invention has been made to achieve the above object, and in order to make the water level of a test trench for constant water level permeability test constant on site, a hose is connected to the test trench. The pressure gauge for detecting the internal pressure of the Marriott that supplies water, the amplifier for amplifying the detection signal, and the recorder for recording the result are provided.

【0007】[0007]

【作用】このような構成であるので、試験トレンチの水
位が減りマリオット内の水位も減ると、マリオットの内
部の圧力も変化する。この変化した圧力を圧力計により
検出し、増巾器によって増巾させ、結果を記録計によっ
て記録する。
With this structure, when the water level in the test trench decreases and the water level in the marriott decreases, the pressure inside the marriott also changes. The changed pressure is detected by a pressure gauge, widened by a widening device, and the result is recorded by a recorder.

【0008】[0008]

【実施例】以下、本発明の一実施例を図1に基づいて説
明する。本実施例の現場はロックフィルダムのコア部で
ある。コア部の盛立面9に試験トレンチ1を堀る。この
試験トレンチ1には水供給ホース3を介してマリオット
5から水が供給される。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The site of this embodiment is the core of the rockfill dam. A test trench 1 is dug in the raised surface 9 of the core portion. Water is supplied to the test trench 1 from the Marriott 5 via a water supply hose 3.

【0009】マリオット5は密閉された容器11の内部
に水13が溜められたものであり、中央には上方から大
気連通管7が貫通し、大気と連通している。大気連通管
7の下端面を境にした上下の圧力のつり合いを考える
と、大気圧をP0としマリオット5内部上方の空気の圧
力をP1とし、試験トレンチ1の水位に対するマリオッ
ト5の水位の水頭をhとすれば P0=P1+hγ(γは水の単位体積当りの重量) となる。
The marriott 5 is a container 11 in which water 13 is stored, and an atmosphere communication pipe 7 penetrates from the upper part in the center to communicate with the atmosphere. Considering the balance of the upper and lower pressures with the lower end surface of the atmosphere communication pipe 7 as a boundary, the atmospheric pressure is P 0 , the pressure of the air above the inside of the Marriott 5 is P 1, and the water level of the Marriott 5 relative to the water level of the test trench 1 is If the water head is h, then P 0 = P 1 + hγ (γ is the weight per unit volume of water).

【0010】今、試験トレンチ1内の水が、矢印で示す
ように、地中に吸収されて水位が下り、水供給ホース3
によって水が供給される。従ってマリオット5の水位も
減少したとすると、上式においてhは減少しP1も減少
(体積が増加するので圧力は減少)するので、上記式の
右辺は左辺よりも小さくなる。これによりP0が相対的
に大きくなり、大気連通管7を介して空気がマリオット
5の内部に供給される。したがって前記P1は増加し、
再び前記式が成立してバランスがとれ、水の供給は止ま
る。このようにして試験トレンチ1の水位は常に一定に
保たれる。
Now, as shown by the arrow, the water in the test trench 1 is absorbed into the ground to lower the water level, and the water supply hose 3
Is supplied with water. Therefore, if the water level of the Marriott 5 also decreases, h in the above equation decreases and P 1 also decreases (pressure decreases because the volume increases), so the right side of the above equation becomes smaller than the left side. As a result, P 0 becomes relatively large, and air is supplied to the inside of the marriott 5 through the atmosphere communication pipe 7. Therefore, the P 1 increases,
The above equation is again established and balanced, and the water supply is stopped. In this way, the water level in the test trench 1 is always kept constant.

【0011】このように、水位を一定に保った状態で供
給される水の量と、供給が行われた時間との比を基に、
試験トレンチ1とマリオット5のそれぞれの水平断面積
を考慮して、透水係数kcm/secを知ることができ
る。
Thus, based on the ratio of the amount of water supplied with the water level kept constant and the time of supply,
The hydraulic conductivity kcm / sec can be known in consideration of the horizontal cross-sectional areas of the test trench 1 and the marriott 5.

【0012】マリオット5の上端には、さらに導水パイ
プ15が設けられ圧力計17が取り付けられる。圧力計
17は水の圧力を、弾性体の歪に変え、この歪に伴う電
気抵抗の変化を基に、電気信号として取り出すものであ
る。この検出信号はケーブル19を介して、増幅器21
によって増幅される。この増幅された検出信号は、その
ままでも供給された水の量に比例するので測定結果とし
て用いることができる。この測定結果は、記録計23に
より記録紙25に記録される。
At the upper end of the marriott 5, a water pipe 15 is further provided and a pressure gauge 17 is attached. The pressure gauge 17 converts the pressure of water into strain of an elastic body, and takes out as an electric signal based on the change in electric resistance due to this strain. This detection signal is sent to the amplifier 21 via the cable 19.
Is amplified by. This amplified detection signal can be used as a measurement result as it is, since it is proportional to the amount of water supplied. The measurement result is recorded on the recording paper 25 by the recorder 23.

【0013】以下、本実施計の動作について説明する。
前述した透水係数kを求める際に、試験トレンチ1及び
マリオット5の水平断面積は予め知ることができ、水の
供給が行われた時間もタイマー(図示せず)によって知
ることができる。また供給された水の量はマリオット5
の水位によって知ることができ、この水位は前記圧力計
17によって検出される圧力に1対1で対応する。従っ
て、この圧力を測定すれば自動的に供給された水の量を
知ることができる。このようにして透水係数kを求める
ことができる。
The operation of this embodiment will be described below.
When obtaining the above-mentioned water permeability k, the horizontal cross-sectional areas of the test trench 1 and the marriott 5 can be known in advance, and the time when water is supplied can also be known by a timer (not shown). The amount of water supplied is Marriott 5
The water level of the pressure gauge 17 corresponds to the pressure detected by the pressure gauge 17 on a one-to-one basis. Therefore, by measuring this pressure, the amount of water automatically supplied can be known. In this way, the water permeability k can be obtained.

【0014】以上のように、圧力計17により圧力を検
出し記録計23により記録を行うことで、従来のように
常に技術者がついてスケールを読み取る必要がなく、ま
た人による読み取り誤差が生じることもない。更には短
い時間で測定を行うことができ、測定結果も連続して保
存しておくことができる。
As described above, by detecting the pressure with the pressure gauge 17 and recording with the recorder 23, it is not necessary for an engineer to always read the scale as in the conventional case, and a human reading error occurs. Nor. Furthermore, the measurement can be performed in a short time, and the measurement results can be continuously stored.

【0015】なお、以上の実施例においては増巾器21
からの増巾信号をそのまま記録するものであったが、他
の実施例においては、水の供給が行われた時間や、入力
された試験トレンチ1及びマリオット5の水平断面積の
値を考慮して演算を行い、透水係数kをより正確に求め
ることのできる演算器を設け、この演算結果を記録計2
3によって記録するものとしてもよい。
In the above embodiment, the amplifier 21
However, in other embodiments, the time when the water was supplied and the values of the horizontal cross-sectional areas of the test trench 1 and the marriott 5 that were input were taken into consideration. An arithmetic unit that can calculate the hydraulic conductivity k more accurately is provided, and the calculation result is recorded by the recorder 2.
3 may be used for recording.

【0016】[0016]

【発明の効果】以上説明したように、本発明の現場透水
試験自動測定装置によれば、マリオット内部の圧力を検
出することでマリオットの水位の減少、ひいては試験ト
レンチの水位の減少を自動的に測定できる。よって、常
に技術者がスケールを読み取るために測定装置に付き添
っている必要がなく、また人による読み取り誤差も生じ
ない、さらに測定結果を記録計により記録でき、短時間
で測定が行え、また連続した記録をとることが可能とな
る。
As described above, according to the in-situ permeation test automatic measuring apparatus of the present invention, by detecting the pressure inside the Marriott, it is possible to automatically reduce the water level of the Marriott, and hence the water level of the test trench. Can be measured. Therefore, the technician does not always have to accompany the measuring device to read the scale, and human reading errors do not occur, and the measurement results can be recorded by the recorder so that the measurement can be performed in a short time and continuous. It is possible to keep a record.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の一実施例を示す全体概略図である。FIG. 1 is an overall schematic diagram showing an embodiment of the present invention.

【図2】 従来例を示す全体概略図である。FIG. 2 is an overall schematic diagram showing a conventional example.

【符号の説明】[Explanation of symbols]

1 試験トレンチ 3 水供給ホース 5 マリオット 7 大気連通管 17 圧力計 21 増巾器 23 記録計 1 Test Trench 3 Water Supply Hose 5 Marriott 7 Atmosphere Communication Pipe 17 Pressure Gauge 21 Magnifier 23 Recorder

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 現場で定水位透水試験を行う試験トレン
チの水位を一定にするため試験トレンチへホースを介し
て水を供給するマリオットの内部の圧力を検出する圧力
計と、検出信号を増巾するための増巾器と、結果を記録
する記録計と、を備えた現場透水試験自動測定装置。
1. A pressure gauge for detecting the internal pressure of a marriott, which supplies water to a test trench through a hose in order to make the water level of the test trench where a constant water level permeability test is performed constant, and a detection signal is increased. An on-site water permeability test automatic measuring device equipped with a widening device for recording and a recorder for recording the results.
JP31699591A 1991-11-29 1991-11-29 On-site permeability test automatic measurement device Expired - Fee Related JP2929562B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31699591A JP2929562B2 (en) 1991-11-29 1991-11-29 On-site permeability test automatic measurement device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31699591A JP2929562B2 (en) 1991-11-29 1991-11-29 On-site permeability test automatic measurement device

Publications (2)

Publication Number Publication Date
JPH05148831A true JPH05148831A (en) 1993-06-15
JP2929562B2 JP2929562B2 (en) 1999-08-03

Family

ID=18083243

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31699591A Expired - Fee Related JP2929562B2 (en) 1991-11-29 1991-11-29 On-site permeability test automatic measurement device

Country Status (1)

Country Link
JP (1) JP2929562B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102288741A (en) * 2011-07-14 2011-12-21 中国科学院水利部成都山地灾害与环境研究所 Method for rapidly measuring rill erodibility of soil
CN104749083A (en) * 2015-03-31 2015-07-01 西安理工大学 Constant head saturated infiltration instrument capable of automatically supplementing water

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102288741A (en) * 2011-07-14 2011-12-21 中国科学院水利部成都山地灾害与环境研究所 Method for rapidly measuring rill erodibility of soil
CN102288741B (en) * 2011-07-14 2014-05-07 中国科学院水利部成都山地灾害与环境研究所 Method for rapidly measuring rill erodibility of soil
CN104749083A (en) * 2015-03-31 2015-07-01 西安理工大学 Constant head saturated infiltration instrument capable of automatically supplementing water

Also Published As

Publication number Publication date
JP2929562B2 (en) 1999-08-03

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