JPH01111914A - Method and apparatus for static cone penetration test - Google Patents
Method and apparatus for static cone penetration testInfo
- Publication number
- JPH01111914A JPH01111914A JP26603387A JP26603387A JPH01111914A JP H01111914 A JPH01111914 A JP H01111914A JP 26603387 A JP26603387 A JP 26603387A JP 26603387 A JP26603387 A JP 26603387A JP H01111914 A JPH01111914 A JP H01111914A
- Authority
- JP
- Japan
- Prior art keywords
- cone
- filter
- water pressure
- pressure
- 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
- 230000003068 static effect Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 12
- 230000035515 penetration Effects 0.000 title claims description 9
- 238000012360 testing method Methods 0.000 title description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000009530 blood pressure measurement Methods 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000003673 groundwater Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- 241000190070 Sarracenia purpurea Species 0.000 description 2
- 241000209149 Zea Species 0.000 description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 235000005822 corn Nutrition 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
地盤情報を得る方法としての静的コーン貫入試験（ＪＩ
Ｓ＾−１２２０−１９７６）などは多くの情報を正確に
得るために電気的に変換されることが行なわれているが
、その試験の一つに貫入中に発生する過剰間隙水圧を計
測するものがあり、その手法は地盤の情報を得るのに有
効で重要視されている。[Detailed description of the invention] [Industrial field of application] Static cone penetration test (JI
S^-1220-1976) etc. are converted electrically to obtain a lot of information accurately, and one of the tests is to measure the excess pore water pressure generated during penetration. This method is considered effective and important for obtaining ground information.
本発明はこのような静的コーン貴人試験方法およびその
装置に関するものである。The present invention relates to such a static cone test method and apparatus.
〔従来の技術および発明が解決すべき問題点〕静的コー
ン貫入装置は第１図に示すようにボーリングロッド１の
先端に地盤情報を得るための計測器を内蔵した静的コー
ン形状の感知器（以下静的コーン装置という）２が取り
付けられ、該ロッド１の他端は地上にある貫入装置４の
上に固定された油圧シリンダー３に取り付けられ、貫入
装置４はスクリュー式アースアンカー５により地面に貫
入力の反力のために固定されているプレート１０に固定
され、該プレート１０にはさらに油圧シリンダー３を駆
動するための油圧発生装置７とそれを上下の動きに制御
する制御装置６が固定されている。ざらに静的コーン装
置２からの電気信号はボーリングロッドの中を通してか
ら外に出された電気コード８により地上にある測定器９
に送られ、計測値の表示や記録、図化を行なう。[Prior art and problems to be solved by the invention] As shown in Fig. 1, the static cone penetrating device is a static cone-shaped sensor that has a built-in measuring device at the tip of a boring rod 1 to obtain ground information. (hereinafter referred to as a static cone device) 2 is attached, and the other end of the rod 1 is attached to a hydraulic cylinder 3 fixed on a penetration device 4 on the ground. The hydraulic cylinder 3 is fixed to a plate 10 which is fixed for the reaction force of the penetrating force, and the plate 10 further includes a hydraulic pressure generating device 7 for driving the hydraulic cylinder 3 and a control device 6 for controlling its vertical movement. Fixed. The electrical signal from the roughly static cone device 2 is passed through a boring rod and then sent out via an electrical cord 8 to a measuring device 9 on the ground.
The measured values are displayed, recorded, and plotted.
このような静的コーン装置の構造は通常第２図に示すよ
うに、ボーリングロッド１に接続される円柱形のコーン
本体１１とその内部には今回の地盤内の間隙水圧を計測
するための圧力計１２があり、この先端に地中に貫入さ
れる耐摩耗性の高い円錐形のコーンチップ１３と土の粒
子は通さないで水だけを通す材料のリング状フィルター
１４が組み込まれている。As shown in Fig. 2, the structure of such a static cone device is usually a cylindrical cone body 11 connected to a boring rod 1, and a pressure inside it for measuring the pore water pressure in the ground. There are a total of 12 of them, and a conical cone tip 13 with high wear resistance that penetrates into the ground and a ring-shaped filter 14 made of a material that only allows water to pass through without soil particles are built into the tip.
ところで地盤内には自由地下水面があり、その水面以下
の地盤内に静的コーン装置を貫入させると土の中に混在
している水はその土と一緒に感知器の体積分だけ脇に押
されて移動せざるを得ない状況になり、その時の地盤の
種類（透水性に関係する）によっては水の圧力分布が感
知器の移動する速度との関係でその自由水面相当の圧力
（これを過剰間隙水圧という）が増加したり減少したり
する。その時の特に圧力が減少する場合、あるいは地下
水面より上部において貫入時に負圧（地盤が移動するに
伴って土と土の粒子間に空隙ができる時に発生する）に
なったりする場合、又は貴人始めの地盤に建て込む時な
どに水圧系は水で飽和されているのが振動などで水が自
由落下して脱水し空気と入れ替わって混入してしまう場
合などにはタイムラグとなって計測すなわち地盤情報が
不正確になってしまう。By the way, there is a free groundwater table in the ground, and when a static cone device penetrates into the ground below that water level, the water mixed in the soil is pushed aside by the volume of the sensor along with the soil. Depending on the type of ground at that time (related to permeability), the pressure distribution of the water may be affected by the pressure equivalent to the free water surface (this is related to the speed at which the sensor moves). excess pore water pressure) increases or decreases. In particular, if the pressure decreases at that time, or if there is negative pressure at the time of penetration above the groundwater table (which occurs when voids are created between soil particles as the ground moves), or if the When building into the ground, the hydraulic system is saturated with water, but if the water falls freely due to vibrations, dehydrates, replaces air, and mixes in, there is a time lag and measurement, i.e., ground information. becomes inaccurate.
従来の手法ではこの様な問題が発生し適正な計測は行え
ない。それらを抽出してみると■液体の圧力を計測する
にはその圧力系を完全に脱気（空気やガスが混入してい
ない状態）をしておかないと混入している気体がつぶれ
液圧の伝達する時間に遅れ（タイムラグ）ができ、今回
の使用方法の目的の時には不正確な値となり無意味な成
果となってしまう。Conventional methods suffer from such problems and cannot perform proper measurements. When we extract them, ■ To measure the pressure of a liquid, the pressure system must be completely degassed (no air or gas mixed in), or the mixed gas will collapse and the liquid pressure There is a time lag in the time it is transmitted, and for the purpose of this method of use, the result will be inaccurate and meaningless.
これを図面を用いて説明すると第３図に示したように静
的コーン装置２のコーンチップ１３を取り付けた先端部
の外周に設けたリング状フィルター１４から圧力計１２
に至る水圧計測系経路中には脱気水１５が充填されてい
るが、もしこの様な水圧系経路中に気泡１６が入り込ん
でいるとフィルター側の圧力Ａなるものが生じた時その
気泡１６がエアークツション”の役目をして圧力計１２
の水圧Ｂはそこに伝達される時間遅れの差ができてしま
う。To explain this with reference to the drawings, as shown in FIG.
Degassed water 15 is filled in the water pressure measurement system path leading to the water pressure system, but if air bubbles 16 enter such a water pressure system path, when the pressure A on the filter side occurs, the air bubbles 16 The pressure gauge 12 acts as an air traction.
There will be a difference in the time delay when the water pressure B is transmitted there.
第４図はそれらを図で示したもので、横軸二時間、縦軸
：圧力で表わすと完全に脱気されたものがＣの実線、気
泡が入り込んだものがＤの破線となる。これらから遅れ
てしまう時間とその値が不正確になっていることがわか
る。FIG. 4 shows these in a diagram, where the horizontal axis is 2 hours and the vertical axis is pressure. The solid line C indicates that the gas was completely degassed, and the broken line D indicates that the air bubbles had entered. It can be seen that the time delay and the value thereof are inaccurate.
■もし、これらをバケツ等の水中で完全に脱気という作
業が行なえたとしても、それを実施する地点での建て込
みや地盤中に挿入されるまで、また、その後のｎ人中で
もその状態が維持できないと同上の結果となる。■Even if it were possible to completely deaerate these items underwater in a bucket, etc., the condition would remain the same at the point where the work is done, until they are built into the ground or inserted into the ground, and even during the subsequent years. If this cannot be maintained, the same result will result.
■地盤中の地下水位のない場合やそれが深い場合にはそ
の土と土との粒子の空隙を押し広げたりする時、また、
地下水位下の水中でもある種の締まった地盤などでは負
の圧力（真空圧力）が発生することが知られているので
その負圧力（−１Ｋｌｆ’／ｃｒｉ ）相当の力でも空
気が入り込めない粒子の隙間の小さいフィルターを用い
ないと水が脱水してその代りに空気やガスが混入してし
まうことになる。■When there is no groundwater level in the ground or when it is deep, when the voids between the soil particles are expanded,
It is known that negative pressure (vacuum pressure) is generated in certain types of compacted ground even under water below the groundwater level, so air cannot enter even with a force equivalent to that negative pressure (-1Klf'/cri). If you do not use a filter with small particle gaps, the water will dehydrate and air or gas will get mixed in instead.
■しかし、上記粒子の隙間の小さいフィルターを用いて
もまだ問題は解決しない。それはフィルター材と感知器
の取り付けの方法の考え方で、隙間の処理は一般的には
何もしないはめ込み式や取り外しできない様に接着剤等
で固めるなどしである。前項で空気やガスが入り込みに
くいフィルター材を選定するに伴ってその材料の中の空
気やガスを事前に追い出しておくことが必要となり、そ
れが簡便に出来ないといけない。たとえば、フィルター
は事前に脱気作業（真空ポンプで長時間の吸引や、煮沸
水に入れ脱気する、など）をしておくことになる。(2) However, even if a filter with small particle gaps is used, the problem still remains. This is the concept of how to attach the filter material and the sensor.Generally, the gap is treated by fitting it in without doing anything, or by fixing it with adhesive so that it cannot be removed. As mentioned in the previous section, when selecting a filter material that prevents air and gas from entering, it is necessary to expel the air and gas from the material in advance, and this must be possible easily. For example, the filter must be deaerated in advance (by suctioning it for a long time with a vacuum pump, degassing it by placing it in boiling water, etc.).
従って従来の手法では、事前にフィルター材を脱気して
おいたものをバケツ等の水中で感知器に取り付けること
をしていてその時に少しでも気泡が測定系の経路中に付
着していたり、またその脱気の度合が完璧でないといけ
ないので、そのために現地で入念に十分な時間をかけて
作業をしなければならなかった。Therefore, in the conventional method, the filter material is deaerated in advance and attached to the sensor underwater in a bucket or the like, and at that time, even a small amount of air bubbles may adhere to the path of the measurement system. Also, the degree of deaeration had to be perfect, so the work had to be done carefully and over a sufficient amount of time on site.
即ち従来のフィルターの取り付は部の構造を示すと、先
ず第５図（イ）に示すようにコーン本体１１とコーンチ
ップ１３の底部との間の外周部にリング状フィルター１
４を挟み、コーンデツプ１３の底部の雌ネジをコーン本
体１１の先端の雄ネジに締め込んだもので、このフィル
ター１４を通った水圧は図示していない充填封入した液
体を伝達して圧力計１２の受圧面に達する構造である。That is, the structure of the conventional filter installation is as follows: First, as shown in FIG.
4, and the female thread at the bottom of the cone depth 13 is tightened to the male thread at the tip of the cone body 11.The water pressure passing through this filter 14 is transmitted to the pressure gauge 12 by transmitting the sealed liquid (not shown). It has a structure that reaches the pressure receiving surface.
ところが、このフィルター取付方法ではリング状フィル
ター１４の両端面とコーン本体１１及びコーンチップ１
３の隙間から中に封入した液体がしみ出したり脱落した
りしてしまう。なおコーン本体１１への取付順序はリン
グ状フィルター１４をセットした後コーンチップ１３を
ネジ込む。However, in this filter mounting method, both end surfaces of the ring-shaped filter 14, the cone body 11, and the cone tip 1
The liquid sealed inside seeps out or falls out from the gap in step 3. The order of attachment to the cone body 11 is to set the ring-shaped filter 14 and then screw in the cone tip 13.
次に第５図（ロ）はこれを改良したものでリング状フィ
ルター１４の両端面にＯリング１７を設けるためコーン
チップ１３の底面にリング状の溝を形成して押えさらに
コーン本体１１側には同じくリング状の溝を形成したフ
ィルター押え板１８にて押えた構造である。このように
することによりリング状フィルター１４の両端面から封
入液体が脱落することはない。ところがこの方式ではコ
ーン本体１１への取付けは先ずフィルター押え板１７を
コーン本体１１にネジ込み、次いでリング状フィルター
１４をセットした後コーンチップ１３をネジ込むもので
あるため、計測系経路に気泡が混入しないように細心の
注意が要求され上記のように現地での入念な作業が必要
であり極めて取扱いずらかった。Next, FIG. 5(B) shows an improved version of this. In order to provide O-rings 17 on both end faces of the ring-shaped filter 14, a ring-shaped groove is formed on the bottom face of the cone tip 13, and the cone tip 13 is pressed down further on the cone body 11 side. It has a structure in which it is held down by a filter holding plate 18 which also has a ring-shaped groove. By doing so, the sealed liquid will not fall off from both end surfaces of the ring-shaped filter 14. However, in this method, when attaching to the cone body 11, the filter holding plate 17 is first screwed into the cone body 11, and then the ring-shaped filter 14 is set and then the cone tip 13 is screwed in, so that air bubbles do not enter the measurement system path. It required extreme care and careful on-site work as described above, making it extremely difficult to handle.
本発明はこれに鑑み種々検討の結果、
■水は通すが空気の泡は通さないフィルター（土が入り
込めず水だけ通す）の特性の把握とその材料の選定
■−度水中で組み立てたならばその後空気が入り込まな
い構造
■それを行なう簡便な方法
以上の点を組み合わせることによって、所定の性能と簡
便さを得たものである。In view of this, the present invention was developed as a result of various studies. ■Understanding the characteristics of a filter that allows water to pass through but not air bubbles (so only water can pass through without allowing soil to enter) and selecting its material. A structure that prevents air from entering afterward ■ A simple method for doing so By combining the above points, the specified performance and simplicity are achieved.
即ち本発明の方法は地盤内の水圧を計測するセンサーを
内蔵した静的コーン装置を地盤内に貫入してその水圧を
計測する方法において、上記センサーの水圧計測系経路
中に気泡が通過できないフィルターを設けることにより
上記水圧をタイムラグなく計測することを特徴とするも
のである。That is, the method of the present invention is a method in which a static cone device equipped with a sensor for measuring water pressure in the ground is penetrated into the ground to measure the water pressure, and a filter that prevents air bubbles from passing through the water pressure measurement system path of the sensor is used. By providing this, the water pressure can be measured without time lag.
また本発明の装置は地盤内の水圧を計測するセンサーを
内部に設けた円柱形コーン本体と該コーン本体の一端に
取り付けた円錐形コーンチップとの間の外周部であって
上記センサーに連通ずる水圧計測系経路中にフィルター
を設けた装置において、気泡を通さないフィルターをコ
ーンチップ底部とフィルター押え板によりそれぞれ防水
パツキンを介して挟持した一体式コーンポイントを上記
コーン本体の一端に取り付けることにより水圧計測系経
路を形成したことを特徴とするものである。Furthermore, the device of the present invention has a cylindrical cone body equipped with a sensor for measuring water pressure in the ground, and a conical cone tip attached to one end of the cone body, the outer periphery of which communicates with the sensor. In a device that has a filter installed in the water pressure measuring system path, the water pressure can be increased by attaching an integral cone point to one end of the cone body, in which a bubble-proof filter is sandwiched between the bottom of the cone tip and the filter holding plate through waterproof gaskets. It is characterized by forming a measurement system path.
このように気泡が通過できないフィルターを用いるのは
いったん脱気したフィルターにて水圧計測系に液体を封
入してしまえば４八作業までの静的コーン装置の取扱い
が容易になるからであり、さらに貫入中の負圧に対して
も初期の状態を維持できるからである。このようなフィ
ルターの特性を調べるため次のような試験を行なりた。The reason for using a filter that does not allow air bubbles to pass through is that once the liquid is sealed in the water pressure measurement system using a deaerated filter, it becomes easier to handle the static cone device for up to 48 operations. This is because the initial state can be maintained even under negative pressure during penetration. In order to investigate the characteristics of such a filter, the following tests were conducted.
（１）完全に脱気（気体が入っていない状態）されてい
る時は真空の圧力で吸引されても中の液体は脱落しない
。その液体と万一気体が入れ替わると不都合がおこる。(1) When it is completely degassed (no gas in it), the liquid inside will not fall out even if it is sucked under vacuum pressure. If the liquid and gas were to exchange places, problems would occur.
（２）次に、真空圧力は一１Ｋ（Ｉｆ／ＣｔＡなのでこ
の圧力で万一気体が入り込めなければ良いことになるの
で、フィルターの中に気体が入り込める圧力の限界を調
べた。(2) Next, since the vacuum pressure is 11K (If/CtA), it would be fine if no gas could enter at this pressure, so we investigated the limit of the pressure at which gas could enter the filter.
（３）その方法は気体の量を計但するのは難しいので水
置換の法をとって、下から気体の圧力を入れフィルター
の内部に入った気体の但をその分押し出された液体伍を
もって測定した。(3) Since it is difficult to measure the amount of gas in this method, we use the water displacement method to apply gas pressure from below and replace the gas that has entered the inside of the filter with the liquid that is pushed out. It was measured.
即ち、第６図に示すように完全に脱気した試験用フィル
ター１９を上下に貫通孔２０を有する簡易フィルター試
験器２１の下部に該貫通孔２０を塞ぐように取り付け、
貫通孔２０の上端の開口より水を入れて水柱２２を形成
しておく。このような試験器２１に取り付けたフィルタ
ー１９の下端より気体の圧力を加えると、その圧力によ
って内部に浸入した気体により押しのけられた液体は水
柱２２を押し上げ、みかけ上水の体積がＶだけ増加する
。このＶをその時の気体圧力での気体の通過■とした。That is, as shown in FIG. 6, a completely deaerated test filter 19 is attached to the lower part of a simple filter tester 21 having through holes 20 at the top and bottom so as to close the through holes 20.
Water is poured into the opening at the upper end of the through hole 20 to form a water column 22. When gas pressure is applied from the lower end of the filter 19 attached to such a tester 21, the liquid displaced by the gas that has entered the interior due to the pressure pushes up the water column 22, and the apparent volume of clean water increases by V. . This V was defined as the gas passage (■) at the gas pressure at that time.
（４）第７図はその結果を示すもので、横軸：気体圧力
、縦軸二連過量を示し、気体通過圧力が１ Ｋｙｆ／ｃ
ｔｉ （真空圧は−１に’ｊｆ／ｃｉ＞以上のフィルタ
ーを用いれば良い。即ち従来のフィルターは’ＩＫ’ｊ
ｆ／ｃｒＡ以下で通過してしまうＦの破線のものである
のに対して、本発明で用いるフィルター材は１に９ｆ／
ｃｒＡ以上のＥの実線の結果で表されるものが良好であ
る。(4) Figure 7 shows the results, where the horizontal axis shows the gas pressure and the vertical axis shows the double flow rate, where the gas passing pressure is 1 Kyf/c.
ti (The vacuum pressure should be -1 and a filter with 'jf/ci> or more should be used. In other words, the conventional filter is 'IK'j
The filter material used in the present invention has a filter material of 1 to 9 f/crA, whereas the filter material shown in the broken line of F passes through at f/crA or less.
Those represented by the solid line results of E higher than crA are good.
このような微粒径の材料としてはそれを成形するための
条件を可能にしたセラミック製の材質を選択し、フィル
ター径は約１μｍが適当である。As the material having such a fine particle size, a ceramic material is selected that allows the conditions for molding it, and the appropriate filter diameter is about 1 μm.
また気泡を通さないフィルターをコーンチップ底部とフ
ィルター押え板によりそれぞれ防水パツキンを介して挟
持した一体式コーンポイントをざらにコーン本体の一端
に取り付けることにより水圧計測系経路を形成するのは
フィルター等の構成部品がばらばらでなく、コーンポイ
ントとして一体化しているので、コーン本体へ取り付け
る際に極めて容易に取り付は作業ができ、さらに紛失の
危険も少なく取扱いが容易だからである。そして一体式
コーンポイントのままフィルターの脱気のため煮沸や真
空脱気が行なえる。In addition, a water pressure measurement system path is formed by attaching an integrated cone point, which is sandwiched between the bottom of the cone tip and the filter holding plate through waterproof gaskets, to one end of the cone body to form a water pressure measurement system path. This is because the component parts are not separated and are integrated as a cone point, so it can be attached to the cone body extremely easily, and there is less risk of loss and it is easy to handle. Boiling and vacuum degassing can be performed to degas the filter with the integrated cone point.
本発明を実施例により説明する。 The present invention will be explained by examples.
第８図は本発明の静的コーン装置の一例を示すもので、
底面の中央部を凸状に延設してその中央に雌ネジを螺刻
し、さらに底面にリング状のＯリング１１用の溝を形成
した円錐形コーンチップ１３の上記凸状部の外周に気泡
不通過のリング状フィルター２３を嵌入した。次に、内
周に雌ネジが螺刻してあり、一端面にＯリング１７用の
溝を形成したフィルター押え板１８により、上記フィル
ター２３をコーンチップ１３の底面とで挟み、それぞれ
に０リング１７．１７を介在させておきこの押え板１８
の他端面から止めネジ２４によりこれらを一体に取り付
けて一体式コーンポイント２５として、あらかじめ作業
現場外の室内等で用意しておく。FIG. 8 shows an example of the static cone device of the present invention.
On the outer periphery of the convex part of the conical cone chip 13, the central part of the bottom face is extended in a convex shape, a female thread is carved in the center, and a groove for the ring-shaped O-ring 11 is formed on the bottom face. A ring-shaped filter 23 that does not allow air bubbles to pass through was fitted. Next, the filter 23 is sandwiched between the bottom surface of the cone tip 13 and the filter holding plate 18, which has a female screw threaded on the inner periphery and a groove for the O-ring 17 formed on one end surface. 17. This presser plate 18 with 17 interposed
These are attached together from the other end surface with a set screw 24 to form an integrated cone point 25, which is prepared in advance in a room or the like outside the work site.
このような一体式コーンポイント２５をコーン本体に取
り付けるには第９図に示すようにコーン本体１１を、該
本体１１の一体式コーンポイントの取付部の雄ネジ側を
上に向けてコーンスタンド２６に代入して支持し、コー
ン本体１１の周囲にパツキン２７を密接させた取付持具
２８により水カップ２９をコーン本体１１の上部に取り
付け、この水カップ２９に脱気水１５を取付部が十分水
没する高さまで満たした。次に脱気水１５中でスポイト
３０によりコーン本体１１内の水圧計測系経路に付着し
た気泡を吸い取り、ざらにあらかじめ用意しである一体
式コーンポイント２５をコーン本体１１の取付部にネジ
込んで第８図に示す静的コーン装置が完成する。To attach such an integrated cone point 25 to a cone body, as shown in FIG. A water cup 29 is attached to the upper part of the cone body 11 by means of a mounting fixture 28 which is substituted and supported by the cone body 11 and has a gasket 27 brought into close contact with the periphery of the cone body 11. It was filled to the height of submersion. Next, use the dropper 30 in the degassed water 15 to suck up air bubbles attached to the water pressure measurement system path in the cone body 11, and screw the integrated cone point 25 prepared in advance into the mounting part of the cone body 11. The static cone device shown in FIG. 8 is completed.
（測定例）
上記の静的コーン装置を用いて過剰間隙水圧を実測した
一例を第１０図に示す。(Measurement Example) FIG. 10 shows an example of actual measurement of excess pore water pressure using the static cone device described above.
一般的な地盤は地表面よりいくらか低い所に地下水位が
あるが、近年は地下水位の変動が大きく年々低下してい
く傾向にある。Generally speaking, the groundwater level is located somewhat lower than the ground surface, but in recent years, the groundwater level has fluctuated significantly and has been declining year by year.
そのような地盤に対して実施したもので、Ｇの実線は本
発明を用いた方法で実施した例、Ｈの破線は従来からあ
る方法で得たもので、Ｇ線の方が地盤の情報を良く反映
していて細かく、より正確なものが得られているのが判
る。The solid line G is an example obtained using the method of the present invention, and the broken line H is an example obtained using a conventional method. Line G shows information about the ground better. It can be seen that the image is well reflected, detailed, and more accurate.
このように本発明によれば地盤内の過剰間隙水圧がタイ
ムラグなく正確に測定でき、ざらに測定器である静的コ
ーン装置の組み立てや取扱いが極めて容易になる等顕著
な効果を奏するものである。As described above, according to the present invention, excess pore water pressure in the ground can be accurately measured without time lag, and the static cone device, which is a rough measuring device, can be extremely easily assembled and handled, and other remarkable effects are achieved. .
第１図は静的コーン貫入試験装置を示す説明図、第２図
は静的コーン装置を示す断面図、第３図は水圧計測系に
混入した気泡により測定にタイムラグが生ずることを示
す説明図、第４図は脱気水を使用した場合と気泡が混入
した水を使用した場合の圧力計への圧力の伝達時間の差
を示す説明図、第５図（イ） （ロ）はそれぞれ従来の
静的コーン装置の要部断面図、第６図はフィルタ、−の
気体通過量の試験方法を示す説明図、第７図は従来フィ
ルターと本発明で使用したフィルターでの気体通過量を
示す実測図、第８図は本発明の一実施例を示す要部断面
図、第９図は本発明の静的コーン本体にコーンポイント
を取り付ける方法を示す説明図、第１０図は本発明及び
従来の静的コーン装置を用いて測定した過剰間隙水圧の
結果を示す実測図である。
１・・・ボーリングロッド、２・パ・静的コーン装置、
３・・・油圧シリンダー、４・・・貫入装置、５・・・
スクリュー式アースアンカー、６・・・制御装置、７・
・・油圧発生装置、８・・・電気コード、９・・・測定
器、１０・・・プレート、１１・・・コーン本体、１２
・・・圧力計、１３・・・コーンチップ、１４・・・リ
ング状フィルター、１５・・・脱気水、１６・・・気泡
、１７・・・０リング、１８．１８゜・・・フィルター
押え板、１９・・・試験用フィルター、２０・・・貫通
孔、２１・・・簡易フィルター試験器、２２・・・水柱
、２３・・・気泡不通過のリング状フィルター、２４・
・・止めネジ、２５・・・一体式コーンポイント、２６
・・・コーンスタンド、２７・・・パツキン、２８・・
・取付治具、２９・・・水カップ、３０・・・スポイト
第１図
時間
第７図
１ イ本月乙 力 （Ｋｇｆ／ａｍ２）第８図
第９図
第１０図Fig. 1 is an explanatory diagram showing a static cone penetration test device, Fig. 2 is a cross-sectional view of the static cone device, and Fig. 3 is an explanatory diagram showing that a time lag occurs in measurement due to air bubbles mixed into the water pressure measurement system. , Figure 4 is an explanatory diagram showing the difference in pressure transmission time to the pressure gauge when using degassed water and when using water with air bubbles mixed in. Figures 5 (a) and (b) are respectively for conventional Fig. 6 is an explanatory diagram showing the test method for the amount of gas passing through the filter, and Fig. 7 shows the amount of gas passing through the conventional filter and the filter used in the present invention. Fig. 8 is a cross-sectional view of a main part showing an embodiment of the present invention, Fig. 9 is an explanatory drawing showing a method of attaching a cone point to a static cone body of the present invention, and Fig. 10 is a cross-sectional view of the main part showing an embodiment of the present invention. FIG. 2 is an actual measurement diagram showing the results of excess pore water pressure measured using a static cone device. 1... Boring rod, 2. Static cone device,
3... Hydraulic cylinder, 4... Penetration device, 5...
Screw type earth anchor, 6...control device, 7.
...Hydraulic pressure generator, 8...Electric cord, 9...Measuring device, 10...Plate, 11...Cone body, 12
... Pressure gauge, 13 ... Corn chip, 14 ... Ring-shaped filter, 15 ... Deaerated water, 16 ... Air bubbles, 17 ... 0 ring, 18.18° ... Filter Holding plate, 19... Test filter, 20... Through hole, 21... Simple filter tester, 22... Water column, 23... Ring-shaped filter that does not allow air bubbles to pass through, 24...
・Set screw, 25 ・Integrated cone point, 26
...Corn stand, 27...Patsukin, 28...
・Mounting jig, 29... Water cup, 30... Dropper Figure 1 Time Figure 7 Figure 1 Power (Kgf/am2) Figure 8 Figure 9 Figure 10
Claims (2)
コーン装置を地盤内に貫入してその水圧を計測する方法
において、上記センサーの水圧計測系経路中に気泡が通
過できないフィルターを設けることにより上記水圧をタ
イムラグなく計測することを特徴とする静的コーン貫入
試験方法。(1) In a method in which a static cone device with a built-in sensor for measuring water pressure in the ground penetrates into the ground and measures the water pressure, a filter that does not allow air bubbles to pass through the water pressure measurement system path of the sensor is provided. A static cone penetration test method characterized by measuring the above-mentioned water pressure without time lag.
円柱形コーン本体と該コーン本体の一端に取り付けた円
錐形コーンチップとの間の外周部であって上記センサー
に連通する水圧計測系経路中にフィルターを設けた装置
において、気泡を通さないフィルターをコーンチップ底
部とフィルター押え板によりそれぞれ防水パッキンを介
して挟持した一体式コーンポイントを上記コーン本体の
一端に取り付けることにより水圧計測系経路を形成した
ことを特徴とする静的コーン装置。(2) A water pressure measurement system that is located on the outer periphery between a cylindrical cone body equipped with a sensor for measuring water pressure in the ground and a conical cone tip attached to one end of the cone body, and that communicates with the sensor. In a device with a filter installed in the path, the water pressure measurement system path can be improved by attaching an integrated cone point, which has a bubble-proof filter sandwiched between the bottom of the cone chip and the filter holding plate via waterproof packing, to one end of the cone body. A static cone device characterized by forming:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62266033A JP2578337B2 (en) | 1987-10-21 | 1987-10-21 | Static cone penetration test method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62266033A JP2578337B2 (en) | 1987-10-21 | 1987-10-21 | Static cone penetration test method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01111914A true JPH01111914A (en) | 1989-04-28 |
| JP2578337B2 JP2578337B2 (en) | 1997-02-05 |
Family
ID=17425453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62266033A Expired - Lifetime JP2578337B2 (en) | 1987-10-21 | 1987-10-21 | Static cone penetration test method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2578337B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0430452U (en) * | 1990-07-06 | 1992-03-11 | ||
| CN102953363A (en) * | 2012-11-14 | 2013-03-06 | 东南大学 | Resistivity detector for quantitatively evaluating change of soil porosity |
| CN107016204A (en) * | 2017-04-14 | 2017-08-04 | 中铁第四勘察设计院集团有限公司 | A kind of method for determining lateral loading test horizontal foundation modulus |
| CN107022995A (en) * | 2017-05-27 | 2017-08-08 | 中铁第四勘察设计院集团有限公司 | The method that lateral loading test datum-plane bedding value is determined using static sounding specific penetration resistance |
| CN107130577A (en) * | 2017-05-27 | 2017-09-05 | 中铁第四勘察设计院集团有限公司 | The method that Flat Dilatometer Test datum-plane bedding value is determined using static sounding specific penetration resistance |
| JP2021195825A (en) * | 2020-06-17 | 2021-12-27 | 錦城護謨株式会社 | Pore water pressure measurement assembly and installation method of the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400456A (en) * | 2011-11-17 | 2012-04-04 | 东南大学 | Environment piezocone penetration test probe capable of testing fluorescence intensity of soil body |
-
1987
- 1987-10-21 JP JP62266033A patent/JP2578337B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0430452U (en) * | 1990-07-06 | 1992-03-11 | ||
| CN102953363A (en) * | 2012-11-14 | 2013-03-06 | 东南大学 | Resistivity detector for quantitatively evaluating change of soil porosity |
| CN107016204A (en) * | 2017-04-14 | 2017-08-04 | 中铁第四勘察设计院集团有限公司 | A kind of method for determining lateral loading test horizontal foundation modulus |
| CN107016204B (en) * | 2017-04-14 | 2019-10-08 | 中铁第四勘察设计院集团有限公司 | A kind of method of determining lateral loading test horizontal foundation modulus |
| CN107022995A (en) * | 2017-05-27 | 2017-08-08 | 中铁第四勘察设计院集团有限公司 | The method that lateral loading test datum-plane bedding value is determined using static sounding specific penetration resistance |
| CN107130577A (en) * | 2017-05-27 | 2017-09-05 | 中铁第四勘察设计院集团有限公司 | The method that Flat Dilatometer Test datum-plane bedding value is determined using static sounding specific penetration resistance |
| CN107022995B (en) * | 2017-05-27 | 2019-04-02 | 中铁第四勘察设计院集团有限公司 | The method for determining lateral loading test datum-plane bedding value using static sounding specific penetration resistance |
| CN107130577B (en) * | 2017-05-27 | 2019-07-16 | 中铁第四勘察设计院集团有限公司 | The method for determining Flat Dilatometer Test datum-plane bedding value using static sounding specific penetration resistance |
| JP2021195825A (en) * | 2020-06-17 | 2021-12-27 | 錦城護謨株式会社 | Pore water pressure measurement assembly and installation method of the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2578337B2 (en) | 1997-02-05 |
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