JPH0468569B2 - - Google Patents
Info
- Publication number
- JPH0468569B2 JPH0468569B2 JP62035115A JP3511587A JPH0468569B2 JP H0468569 B2 JPH0468569 B2 JP H0468569B2 JP 62035115 A JP62035115 A JP 62035115A JP 3511587 A JP3511587 A JP 3511587A JP H0468569 B2 JPH0468569 B2 JP H0468569B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- casing
- water
- cement
- specific gravity
- 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
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Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は水中に打設したセメント系硬化材の
天端位置を測定するなど比重の異なる液状体の天
端位置測定装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for measuring the top position of liquid materials having different specific gravities, such as measuring the top position of cement-based hardened material placed in water.
連続地中壁や現場打ち杭を構築する場合に、水
や泥水の安定液中にセメント系硬化材をトレミー
管によつて打設して杭や地中壁を構築する方法が
広く知られている。
When constructing continuous underground walls or cast-in-place piles, a widely known method is to use a tremie pipe to cast a cement-based hardening material into a stabilized solution of water or muddy water. There is.
このような水中セメント系硬化材打設工法にお
いて重要なことはトレミー管下端をセメント系硬
化材の天端よりも常に所定間隔以上下方に位置さ
せることである。トレミー管下端がセメント系硬
化材天端に余り近づきすぎている場合、天端付近
にある土砂屑、泥水、スライム、レータンスなど
が硬化材に深く混入して品質を低下させ、構造物
の強度を低下させたり、不均一にしてしまうため
である。 What is important in such an underwater cement-based hardening material casting method is to always position the lower end of the tremie tube below the top end of the cement-based hardening material by a predetermined distance or more. If the lower end of the tremie pipe is too close to the top of the cement-based hardened material, dirt, mud, mud, slime, letance, etc. near the top will deeply mix into the hardened material, reducing its quality and weakening the strength of the structure. This is because it may lower the quality or make it non-uniform.
この天端位置を知るために従来は錘りをつけた
検尺を水中に降して、手応えにより察知するとい
う作業者の感に頼るという極めて不正確な測定が
行われていた。 In order to determine the top position, the conventional method was to lower a scale with a weight into the water and rely on the operator's sense of touch, which was extremely inaccurate.
このような問題点を解決するために、本件出願
人は特願昭60−198991号（特開昭62−59721号）
にかかる発明を開示した。該発明はセメント系硬
化材とその上にある水部分との比重が異なること
を利用するもので、ケーシングの外周に長手方向
に等間隔離れて複数の圧力計を取付け、これを水
中に降下して垂直圧力分布を検出し、比重の大き
いセメント系硬化材中にある圧力値が検出する圧
力値が上方の水中にある圧力計が検出する圧力値
よりも圧力勾配の傾きが大きくなることで天端位
置を知るものである。 In order to solve these problems, the applicant has filed Japanese Patent Application No. 60-198991 (Japanese Unexamined Patent Publication No. 62-59721).
disclosed the invention. This invention takes advantage of the fact that the specific gravity of the cement-based hardening material and the water portion above it is different, and a plurality of pressure gauges are attached to the outer periphery of the casing at equal intervals in the longitudinal direction, and the pressure gauges are lowered into the water. The vertical pressure distribution is detected by the vertical pressure distribution, and the pressure value detected in the cement-based hardened material with a large specific gravity is higher than the pressure value detected by the pressure gauge in the water above. It is used to know the end position.
しかし溝や孔は場合によつて深さは100メート
ルを超すようなものもあり、ケーシング外周の周
辺圧力分布のみを検出していたのでは圧力値が極
めて大きくなり、これに対する水と硬化材の比重
の差による圧力値の差は極めて小さいものとなつ
てしまい、圧力値の微妙な変化を把握するのは困
難であつた。従つて硬化材の天端位置を正確に知
ることはできなかつた。
However, the depth of grooves and holes can exceed 100 meters in some cases, and if only the peripheral pressure distribution around the casing was detected, the pressure value would be extremely large, and the amount of water and hardening material to respond to this would be extremely large. The difference in pressure value due to the difference in specific gravity was extremely small, making it difficult to grasp subtle changes in pressure value. Therefore, it was not possible to accurately determine the top position of the hardened material.
この発明は水部分と硬化材部分の比重の差によ
る圧力変化を正確に知ることができるセメント系
硬化材等の比重の異なる液状体の天端位置測定装
置を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for measuring the top position of a liquid material having a different specific gravity, such as a cement-based hardening material, which can accurately determine the pressure change due to the difference in specific gravity between a water portion and a hardening material portion.
この発明にかかる比重の異なる液状体の天端位
置測定装置は、長手方向中間部外周に可撓性圧力
膜を設けた筒状のケーシング内に水と比重の異な
る受圧液を密封し、このケーシング外周には長手
方向に等間隔離して圧力計を取付ける。圧力計に
よつてケーシング外圧と内圧の差圧を検出する。
The device for measuring the top position of liquid bodies with different specific gravities according to the present invention seals water and pressure receiving liquids with different specific gravities in a cylindrical casing in which a flexible pressure membrane is provided on the outer periphery of the longitudinally intermediate portion. Install pressure gauges on the outer periphery at equal intervals in the longitudinal direction. A pressure gauge detects the differential pressure between the casing external pressure and internal pressure.
ケーシング内には可撓性圧力膜によつて外圧が
内圧として作用しており、これを圧力計にバツク
プレツシヤーとして与え、圧力計によつて差圧の
みを検出するため、微妙な圧力変化が明瞭に認識
できる。 Inside the casing, external pressure acts as internal pressure through a flexible pressure membrane, which is applied to the pressure gauge as back pressure, and the pressure gauge detects only the differential pressure, so subtle pressure changes can be avoided. can be clearly recognized.
以下、図に示す一実施例に基づきこの発明を詳
細に説明する。
Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.
図においてＡはこの発明にかかる天端位置測定
装置であり、円筒状のケーシング１の長手方向中
間部に孔２が穿設され、この孔２にゴム製の可撓
性圧力膜３が張設されている。このケーシング１
内にはシリコンオイル等の水と比重の異なるしか
もセンサー内の防蝕に役立つ受圧液が充満されて
密封されている。ケーシング１の外周にはケーシ
ング１の長手方向に或る間隔離れて複数の圧力計
４ａ，４ｂ，４ｃ，４ｄ，４ｅが取付けられてい
る。圧力計４ａ〜ｅは差圧計であつてケーシング
１の外圧とケーシング１の内圧との差圧を検出可
能である。ケーシング１はロツドによつて押込ま
れ、地上からの深さを知ることができる。またロ
ツドを使用しない場合には、ケーシング１の下端
には地上からの給電で振動する振動体５が取付け
られており、硬化材への貫入が容易に行え、ケー
シング深度を検知できるようになつている。 In the figure, A is the top position measuring device according to the present invention, in which a hole 2 is bored in the longitudinal middle part of a cylindrical casing 1, and a flexible pressure membrane 3 made of rubber is stretched over this hole 2. has been done. This casing 1
The interior is filled and sealed with a pressure-receiving liquid such as silicone oil, which has a different specific gravity from water and which helps prevent corrosion inside the sensor. A plurality of pressure gauges 4a, 4b, 4c, 4d, and 4e are attached to the outer periphery of the casing 1 at certain intervals in the longitudinal direction of the casing 1. The pressure gauges 4a to 4e are differential pressure gauges and are capable of detecting the differential pressure between the external pressure of the casing 1 and the internal pressure of the casing 1. The casing 1 is pushed in by a rod, and the depth from the ground can be determined. In addition, when the rod is not used, a vibrating body 5 that vibrates by power supply from the ground is attached to the lower end of the casing 1, making it possible to easily penetrate the hardening material and detect the casing depth. There is.
以上のような天端位置測定装置Ａがワイヤ６に
よつて吊下げられ、地上に置かれた巻取装置７の
ドラムに巻取り、或いは繰出し可能となつてい
る。 The top position measuring device A as described above is suspended by a wire 6, and can be wound onto a drum of a winding device 7 placed on the ground or let out.
天端位置測定装置Ａによつて測定を行う場合、
巻取装置７からワイヤ６を繰出して溝や孔８内の
泥水９中に降下させる。 When measuring with the top position measuring device A,
The wire 6 is let out from the winding device 7 and lowered into the muddy water 9 in the groove or hole 8.
ケーシング１には可撓性圧力膜３が張設されて
いるため、圧力膜３と同高さの周辺圧力αがケー
シング１内の受圧液に作用する。この圧力αを基
準圧とすれば、第１図に示すようにケーシング
１内の液圧〓は、圧力膜３の上方はαより小さ
く、下方はαより大きくなる勾配を示す。また泥
水９の水圧Ｐも圧力膜３の上方はαより小さく、
下方はαより大きくなる勾配を示す。ただし受圧
液は泥水９よりも比重が軽いため、受圧液の液圧
αの勾配は泥水９の水圧Ｐの勾配よりも傾きが小
さくなる。すなわち圧力膜３よりも上方ではケー
シシング１の内圧の方が外圧より高く、圧力膜３
の下方ではケーシング１の内圧の方が外圧より低
くなる。 Since the flexible pressure membrane 3 is stretched over the casing 1, a peripheral pressure α having the same height as the pressure membrane 3 acts on the pressure-receiving liquid within the casing 1. If this pressure α is taken as a reference pressure, the hydraulic pressure inside the casing 1 exhibits a gradient that is smaller than α above the pressure membrane 3 and larger than α below the pressure membrane 3, as shown in FIG. Moreover, the water pressure P of the muddy water 9 is also smaller than α above the pressure membrane 3.
The downward direction shows a slope that is larger than α. However, since the pressure receiving liquid has a lighter specific gravity than the muddy water 9, the gradient of the hydraulic pressure α of the pressure receiving liquid is smaller than the gradient of the water pressure P of the muddy water 9. That is, above the pressure membrane 3, the internal pressure of the casing 1 is higher than the external pressure, and the pressure membrane 3
Below, the internal pressure of the casing 1 is lower than the external pressure.
圧力計４ａ〜ｅはケーシング１の外圧と内圧の
差圧P1，P2，P3，P4を測定する。この差圧P1〜4
は小さな値であり。各差圧P1，P2，P3，P4の値
の微妙な差は明瞭に把握できる。 The pressure gauges 4a to 4e measure differential pressures P1 , P2 , P3 , and P4 between the external pressure and the internal pressure of the casing 1. This differential pressure P 1~4
is a small value. Subtle differences in the values of the differential pressures P 1 , P 2 , P 3 , and P 4 can be clearly understood.
この測定装置Ａがセメントミルク、モルタル、
コンクリート等のセメント系硬化材１０の天端１
１まで到達したとき、硬化材１０の比重はその上
の泥水９よりも比重が重いため天端１１よりも下
方のケーシング１の周辺圧力αは、泥水９の場合
よりも更に圧力勾配の傾きが大きくなる。従つて
ケーシング１が泥水９と硬化材１０の境界部に位
置するときは第５図に示す圧力勾配を示すことに
なる。 This measuring device A is used for cement milk, mortar,
Top end 1 of cement hardening material 10 such as concrete
1, the specific gravity of the hardened material 10 is heavier than the muddy water 9 above it, so the surrounding pressure α of the casing 1 below the top 11 has a pressure gradient that is even steeper than that of the muddy water 9. growing. Therefore, when the casing 1 is located at the boundary between the muddy water 9 and the hardening material 10, the pressure gradient shown in FIG. 5 will be exhibited.
そこで５個の圧力計４ａ〜ｅにより検出した各
差圧P1〜5を比較し、泥水９の示す圧力勾配と硬化
材１０の示す圧力勾配の交点、すなわちケーシン
グ１に対する硬化材１０の天端１１位置を演算に
よつて求める。これにワイヤ６の繰出し長さｌを
加算して、水面からの硬化材１０等の天端１１位
置及び比重を測定する。 Then, the differential pressures P 1 to 5 detected by the five pressure gauges 4a to 4e are compared, and the intersection point of the pressure gradient shown by the muddy water 9 and the pressure gradient shown by the hardened material 10, that is, the top of the hardened material 10 with respect to the casing 1 is determined. 11 position is determined by calculation. Adding the length l of the wire 6 to this, the position and specific gravity of the top end 11 of the hardening material 10 and the like from the water surface are measured.
この発明は以上のようにして硬化材１０の天端
１１位置を測定するが、各圧力計４ａ〜ｅの示す
差圧値P1〜5と硬化材１０の天端１１位置をデジタ
ルで表示するか、直接特性グラフで表示する
CRT式とすることもできる。 This invention measures the position of the top 11 of the hardened material 10 as described above, and digitally displays the differential pressure values P 1 to 5 indicated by the pressure gauges 4a to 4e and the position of the top 11 of the hardened material 10. or display directly in the characteristic graph.
It can also be a CRT type.
この発明は以上のような構成を有するが、圧力
計４が破損しないようにするために第３図に示す
ように圧力計４の外周を金網１２等で保護するこ
とも考えられる。 Although the present invention has the above-described configuration, in order to prevent the pressure gauge 4 from being damaged, it is conceivable to protect the outer periphery of the pressure gauge 4 with a wire mesh 12 or the like as shown in FIG. 3.
またこの発明にかかる天端位置測定装置Ａはセ
メント系硬化材１０を打設するためのトレミー管
外周に取付け、トレミー管に対する硬化材１０の
天端１１を明瞭に把握し、常時トレミー管の吐出
口が硬化材１０の天端１１より所定間隔深くなる
よう調整することも可能である。 Further, the crown position measuring device A according to the present invention is attached to the outer periphery of a tremie tube for pouring cement-based hardened material 10, and can clearly grasp the top end 11 of the hardened material 10 relative to the tremie tube, and constantly monitors the discharge of the tremie tube. It is also possible to adjust the outlet so that it is deeper than the top end 11 of the hardening material 10 by a predetermined distance.
また上記の実施例では受圧液として水より比重
の軽いシリコンオイルを使用したが、水より比重
の重い液体を使用してもよい。このときケーシン
グ１の内圧の圧力勾配βは泥水９のそれより傾き
が大きくなり、その差圧を圧力計４により検出す
る。 Further, in the above embodiment, silicone oil having a specific gravity lighter than water is used as the pressure receiving liquid, but a liquid having a specific gravity heavier than water may be used. At this time, the pressure gradient β of the internal pressure of the casing 1 becomes larger than that of the muddy water 9, and the pressure difference is detected by the pressure gauge 4.
また、圧力計４の性格によつてはゴム膜３をケ
ーシング１の中央以外に設置し、圧力計４の性能
を確保することもある。 Further, depending on the characteristics of the pressure gauge 4, the rubber membrane 3 may be installed at a location other than the center of the casing 1 to ensure the performance of the pressure gauge 4.
なお一般にセメント系硬化材は硬化時に発熱が
あるためケーシング１は断熱性の優れたものにす
る必要がある。 Note that since cement-based hardening materials generally generate heat during hardening, the casing 1 must have excellent heat insulation properties.
この発明は以上のような構成を有し、長手方向
中間部外周に可撓性圧力膜を設けた筒状のケーシ
ング内に水より比重の軽い受圧液を密封し、この
ケーシング外周には長手方向に或る間隔離して複
数の圧力計を取付け、可撓性圧力膜によつて外圧
をケーシング内に伝え、受圧液を介して圧力計に
バツクプレツシヤーとして作用させるものであ
る。圧力計によつては比重の異なる内外の圧力差
を検出するものであり、この圧力値は小さいた
め、微妙な圧力変化を明瞭に認識でき、セメント
系硬化材等の比重の異なる液状体の天端位置を正
確に知ることができる。
The present invention has the above-mentioned configuration, and a pressure receiving liquid having a specific gravity lighter than water is sealed in a cylindrical casing with a flexible pressure membrane provided on the outer periphery of the longitudinally intermediate portion, and A plurality of pressure gauges are attached to the casing in isolation for a certain period of time, and external pressure is transmitted into the casing by means of a flexible pressure membrane, which acts as a back pressure on the pressure gauges via a pressure receiving liquid. Some pressure gauges detect the pressure difference between the inside and outside, which have different specific gravity, and because this pressure value is small, subtle pressure changes can be clearly recognized, and it is possible to detect the temperature of liquid materials with different specific gravity, such as cement-based hardening materials. The end position can be known accurately.
第１図はこの発明にかかる天端位置測定装置の
一実施例を示すものではその正面図、はその
圧力計により検出した圧力勾配図、第２図は測定
状態の断面図、第３図は測定装置の一部拡大斜視
図、第４図及び第５図は測定装置の泥水と硬化材
に対する位置に応じた圧力勾配図である。
Ａ……天端位置測定装置、１……ケーシング、
２……孔、３……可撓性圧力膜、４……圧力計、
５……振動体、６……ワイヤ、７……巻取装置、
８……孔、９……泥水、１０……硬化材、１１…
…天端、１２……金網。
Fig. 1 is a front view of an embodiment of the crown position measuring device according to the present invention, Fig. 2 is a pressure gradient diagram detected by the pressure gauge, Fig. 2 is a sectional view of the measurement state, and Fig. 3 is a diagram of the pressure gradient detected by the pressure gauge. A partially enlarged perspective view of the measuring device, and FIGS. 4 and 5 are pressure gradient diagrams depending on the position of the measuring device with respect to muddy water and hardening material. A...Top position measuring device, 1...Casing,
2... Hole, 3... Flexible pressure membrane, 4... Pressure gauge,
5... Vibrating body, 6... Wire, 7... Winding device,
8...hole, 9...muddy water, 10...hardening material, 11...
...Top, 12...wire mesh.
Claims (1)
筒状のケーシング内に水と比重の異なる受圧液を
密封し、このケーシング外周には長手方向に或る
間隔離して複数の圧力計を取付け、圧力計によつ
てケーシング外圧と内圧の差圧を検出することを
特徴とするセメント系硬化材等比重の異なる液状
体の天端位置測定装置。1 A pressure-receiving liquid having a different specific gravity from water is sealed in a cylindrical casing with a flexible pressure membrane provided on the outer circumference of the longitudinally intermediate portion, and a plurality of pressure gauges are installed on the outer circumference of the casing at intervals in the longitudinal direction. A device for measuring the top position of liquid materials with different specific gravities, such as cement-based hardening materials, characterized by detecting the differential pressure between the external pressure and the internal pressure of the casing using a pressure gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3511587A JPS63201532A (en) | 1987-02-18 | 1987-02-18 | Measuring instrument for top end position of liquid body different in specific gravity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3511587A JPS63201532A (en) | 1987-02-18 | 1987-02-18 | Measuring instrument for top end position of liquid body different in specific gravity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63201532A JPS63201532A (en) | 1988-08-19 |
| JPH0468569B2 true JPH0468569B2 (en) | 1992-11-02 |
Family
ID=12432930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3511587A Granted JPS63201532A (en) | 1987-02-18 | 1987-02-18 | Measuring instrument for top end position of liquid body different in specific gravity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63201532A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8827901D0 (en) * | 1988-11-30 | 1989-01-05 | Shell Int Research | Method & system for measuring vertical density profile of fluid |
| JP2611508B2 (en) * | 1990-06-29 | 1997-05-21 | 株式会社大林組 | Method for measuring the level of underwater concrete |
| JP2573398B2 (en) * | 1990-06-29 | 1997-01-22 | 株式会社大林組 | Method for measuring the level of underwater concrete |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5658422U (en) * | 1979-10-08 | 1981-05-19 |
-
1987
- 1987-02-18 JP JP3511587A patent/JPS63201532A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63201532A (en) | 1988-08-19 |
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