JPH01244366A - Centrifugal soil testing apparatus - Google Patents
Centrifugal soil testing apparatusInfo
- Publication number
- JPH01244366A JPH01244366A JP7096188A JP7096188A JPH01244366A JP H01244366 A JPH01244366 A JP H01244366A JP 7096188 A JP7096188 A JP 7096188A JP 7096188 A JP7096188 A JP 7096188A JP H01244366 A JPH01244366 A JP H01244366A
- Authority
- JP
- Japan
- Prior art keywords
- boxes
- sample
- sample box
- test
- bucket
- 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.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 239000002689 soil Substances 0.000 title claims description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000007705 chemical test Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
不発明は土に遠心力を作用ζせた状態で土質試験を行う
ことのできる遠心力式土質試験装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a centrifugal force type soil testing device that can perform soil testing while applying centrifugal force to soil.
土が構成材料である構造物の基礎、ダム、道路などを設
計、施工する場合、土の性質を知ることは非常に重要で
あって、そのため、化学的試験、物理的試験９強度的試
験など目的に応じて種々の試験が行われる。こ＼で対象
とする遠心力式土質試験装置は土に遠心力を作用させる
ことによって、見かけ１土の重量を増加させて実物の状
態を実験室的に再現させ、各種の試験を行うようにされ
たものである。When designing and constructing the foundations of structures, dams, roads, etc. that are made of soil, it is very important to know the properties of soil, and therefore chemical tests, physical tests9 strength tests etc. Various tests are conducted depending on the purpose. The centrifugal force type soil testing device targeted here applies centrifugal force to the soil to increase the apparent weight of soil and reproduce the actual condition in the laboratory, allowing various tests to be carried out. It is what was done.
例えば上記の構造物の基礎（わは構造物の重量及び土の
自重に見合った圧力を受けているからその状態における
基礎の性質全調査したい時には試験上に加える遠心力を
任意に調整して実物土中の圧力状態を再現し、実験室で
実施することができる。For example, the foundation of the above structure (because it is under pressure commensurate with the weight of the structure and the own weight of the soil, if you want to investigate all the properties of the foundation in that state, you can arbitrarily adjust the centrifugal force applied to the test surface and build the actual foundation.) It reproduces the pressure conditions in the soil and can be carried out in the laboratory.
従来の遠心力式土質試験装置を第３図〜第５図に示す。A conventional centrifugal soil testing device is shown in FIGS. 3 to 5.
図において１は駆動軸であって基礎９に支持された主軸
受５と回転自在に嵌合・支持されている。主軸受５には
アーム２がその中央部で固定して取付けられ四にアーム
２の両先端にはバケツ）８．３’がヒンヂ１６を介して
回動自在に取付けられている。バケツ）８，８／は試験
対象となる土または構造模型などを収納する試料箱４，
４′を載置するようになっている。駆動軸１の下部には
動力伝導装置６が設置されていてモータ７の回転を伝導
軸８を経由して駆動軸１に伝達し所要の回転を与へるよ
うになっている。In the figure, reference numeral 1 denotes a drive shaft, which is rotatably fitted and supported by a main bearing 5 supported by a foundation 9. An arm 2 is fixedly attached to the main bearing 5 at its center, and buckets 8.3' are rotatably attached to both ends of the arm 2 via hinges 16. Bucket) 8, 8/ is a sample box 4 that stores the soil or structural model to be tested.
4' is placed there. A power transmission device 6 is installed at the bottom of the drive shaft 1 and transmits the rotation of the motor 7 to the drive shaft 1 via a transmission shaft 8 to provide the required rotation.
なお、駆動軸の上端には回転油圧継手１１が取付けられ
ており、外部油圧配管１５（又は１５°′）より送られ
て来る油圧を回転する軸ｌ内の配管へ伝送する役目をし
２図の例では油圧ジヤツキ１８へ油圧を供給することに
より、試験体１４に対して所望の試験荷重を作用させる
ようになっている。A rotary hydraulic joint 11 is attached to the upper end of the drive shaft, and serves to transmit the hydraulic pressure sent from the external hydraulic piping 15 (or 15°') to the piping inside the rotating shaft l, as shown in Figure 2. In this example, a desired test load is applied to the test specimen 14 by supplying hydraulic pressure to the hydraulic jack 18.
また、駆動軸下端には電気用スリップリング１２が設置
されていて、試験荷重または試験体の受ける応力・変位
などを電気変換した人出方信号を外部に取出すことがで
きるようになっている。Further, an electric slip ring 12 is installed at the lower end of the drive shaft, so that a turnout signal obtained by electrically converting the test load or the stress/displacement applied to the test object can be taken out to the outside.
そして、これら装置全体は防護壁１ｏによって外部と遮
蔽されていて、不測の事故に対して安全を確保するよう
になっている。The entire device is shielded from the outside by a protective wall 1o to ensure safety against unexpected accidents.
なお、アーム２の両先端には各々１組のバケット３及び
３′がセット出来るから同時に２組の試験体をテストす
ることができるが、１組のみテストしたい時には他の組
の試料箱にカウンタウェイトを装着するようにして回転
時のバランスを保つようする。Note that one set of buckets 3 and 3' can be set at each end of the arm 2, so two sets of specimens can be tested at the same time, but if you only want to test one set, you can set the counter to the other set of sample boxes. Attach weights to maintain balance during rotation.
駆動軸ｌが回転する前（試験前）はパヶ・フト３は図の
点線で示すように下方に垂れ下った状態にある（試料箱
も同様）。モータが駆動され動力伝導装置を介し駆動軸
１が回転し始めるとやがてバケット３は遠心力を受けて
水平状態を保持したま一回転するようになり試料箱４内
の試験体１４には所定の遠心力が作用するから、その状
態で試験体１４に対して種々の試験を実施する。Before the drive shaft l rotates (before the test), the gasket and foot 3 are in a state of hanging downward as shown by the dotted line in the figure (the same applies to the sample box). When the motor is driven and the drive shaft 1 begins to rotate via the power transmission device, the bucket 3 receives centrifugal force and begins to rotate again while maintaining a horizontal state, and the test specimen 14 in the sample box 4 is placed in a predetermined position. Since centrifugal force acts, various tests are carried out on the specimen 14 in this state.
第５図はアーム２の先端部の詳細で、遠心力作用下の土
に地震動を与えて土の諸性状を試験しているところであ
る。図において２３は地震動を起すための油圧アクチュ
エータでバケット３に取付けられまたそのラム２３ｍ先
端は取付金具２８ｂを介して試料箱４と連結されている
。試料箱４はコロ２４を介してバケット３内面と摺動自
在に接している。Figure 5 shows the details of the tip of the arm 2, where seismic motion is applied to the soil under the action of centrifugal force to test various properties of the soil. In the figure, reference numeral 23 denotes a hydraulic actuator for generating seismic motion, which is attached to the bucket 3, and the tip of the ram 23m is connected to the sample box 4 via a fitting 28b. The sample box 4 is in slidable contact with the inner surface of the bucket 3 via rollers 24.
この状態で油圧配管２８ｅ 、 ２８ｂを介して油圧
アクチュエータ２３に変動油圧を供給すると試料箱４に
（従ってその中に収納されている土にも）地震動に相当
する変動荷重が負荷されることになる。ところが試料箱
４に作用する変動荷重の反力は油圧アクチュエータ２３
に取付けられたバケット３で支持されるが、バケット３
とアーム２との結合部（ヒンジ１８）には必ず多少のガ
タが存在するから、結局試料箱４（従って内部の土）は
正規の試験変動の外に上記ガタにもとづ 〜く不要
な変動が余分に付加されることになる。In this state, if fluctuating oil pressure is supplied to the hydraulic actuator 23 via the hydraulic pipes 28e and 28b, a fluctuating load corresponding to earthquake motion will be applied to the sample box 4 (and therefore also to the soil stored therein). . However, the reaction force of the fluctuating load acting on the sample box 4 is caused by the hydraulic actuator 23.
is supported by bucket 3 attached to bucket 3.
Since there is always some looseness in the joint between the and arm 2 (hinge 18), the sample box 4 (therefore the soil inside) is unnecessary due to the above looseness in addition to the normal test variation. Additional fluctuations will be added.
また、パケ・ント３の片側にのみ作用する変動反力はア
ーム２断面に対しては不平衡力となって作用するからア
ーム２の回転に悪影響を与えることになる。Furthermore, the variable reaction force that acts only on one side of the packet 3 acts as an unbalanced force on the cross section of the arm 2, which adversely affects the rotation of the arm 2.
従って、これらによって試験精度が懸くなるという問題
がある。Therefore, there is a problem that test accuracy is affected by these factors.
本発明は上記間＠点を解消することを目的とする。The present invention aims to solve the above-mentioned problem.
上述のような悪影響の因となる変動試験荷重の反力を系
内において平衡させる（相殺させる）。The reaction force of the fluctuating test load, which causes the above-mentioned adverse effects, is balanced (cancelled) within the system.
それには試料箱を２分割しく又は試料箱とカウンタウェ
イトをペアにし）その間にアクチュエータを架設した構
成とする。To do this, the sample box is divided into two parts, or the sample box and a counterweight are paired, and an actuator is installed between them.
こうすることによって、試験荷重を受けた一対の試料箱
（又は試料箱とカウンタウェイト）には各々大きさを等
しく方向反対の反力が発生するのでその反力は系内にお
いて相殺される。By doing so, reaction forces of equal magnitude and opposite directions are generated in the pair of sample boxes (or the sample box and the counterweight) subjected to the test load, so that the reaction forces are canceled out within the system.
本発明の各実施例を第１図〜第２図に示す。 Embodiments of the present invention are shown in FIGS. 1 and 2.
第１図に示す＊施例は１個のバケット３に対して１対の
試料箱４ａ、４ｂを設置したもので、その間に油圧アク
チュエータ２３が挿設され両者と各々連結されている。In the embodiment shown in FIG. 1, a pair of sample boxes 4a and 4b are installed for one bucket 3, and a hydraulic actuator 23 is inserted between them and connected to both.
また、試料箱４ａ、 ４ｂは各々パケ・ント３の内面
とコロ２４を介して摺動自在に接している。Further, the sample boxes 4a and 4b are in slidable contact with the inner surface of the package 3 via rollers 24, respectively.
このような構成になっているので、試験に当って、油圧
アクチュエータ２３に変動油圧が供給されると試料箱４
ａ、４ｂには各々大きさ等しく方向反対の変動試験荷重
が負荷され、従って大きさ等しく方向反対の反力が発生
するから、これらの力は加振装置系内においてバランス
（相殺）する。With such a configuration, when a varying hydraulic pressure is supplied to the hydraulic actuator 23 during a test, the sample box 4
Variable test loads of equal magnitude and opposite direction are applied to a and 4b, and therefore reaction forces of equal magnitude and opposite direction are generated, so these forces are balanced (cancelled) within the vibration exciter system.
また、第２図に示す実施例は同じく１個のバケットｓ内
に試料箱４と制振用カウンタウエート２６ヲベアとして
設置し両者から各々突設された荷重受２５ 、２５’間
に油圧アクチュエータ２３７に架設した構造となってい
る。また、試料箱４又は制振用カウンタウェイト２６は
各々コロ２４を介してバケット３の内面と摺動自在に接
している。In addition, in the embodiment shown in FIG. 2, a sample box 4 and a vibration damping counterweight 26 are installed as a bearing in one bucket s, and a hydraulic actuator 237 is installed between the load receivers 25 and 25' protruding from both. The structure is built on. Further, the sample box 4 or the damping counterweight 26 is in slidable contact with the inner surface of the bucket 3 via rollers 24, respectively.
油圧アクチュエータ２３に変動油圧が供給されると、同
アクチュエータ２３に寂起された変動荷重は荷重受２５
、２５／を介して試料箱４及びカウンタウエート２６
に作用し、同時にそれに見合った反力が発生する。この
時試料箱４及びカウンタウェイト２６に発生する反力は
大きさ等しく方向反対なのでこれらは加振系内において
相殺される。When fluctuating oil pressure is supplied to the hydraulic actuator 23, the fluctuating load generated on the actuator 23 is transferred to the load receiver 25.
, 25/ to sample box 4 and counterweight 26
, and at the same time a corresponding reaction force is generated. At this time, the reaction forces generated in the sample box 4 and the counterweight 26 are equal in magnitude and opposite in direction, so that they are canceled out within the excitation system.
実施例で説明した構造とすることによって。 By having the structure explained in the example.
油圧アクチュエータによる加振力（試験荷重）の反力を
バランス（相殺）させるようにしたので、従来方式のよ
うな反力の不平衡にもとづく影響がなくなり試験装置の
機能向上及び試験精度の向上をはかることができる。Since the reaction force of the excitation force (test load) from the hydraulic actuator is balanced (cancelled), there is no effect due to unbalanced reaction force as in the conventional method, improving the functionality of the test equipment and test accuracy. It can be measured.
第１図は本発明の一実施例を示す一部平面図。
第２図は本発明の別の実施例を示す一部平面図。
第３図は従来の遠心力式土質試験装置の全体側面図、第
４図はその平面図、第５図は従来方式の試験荷重負荷部
を示す詳細平面図である。FIG. 1 is a partial plan view showing one embodiment of the present invention. FIG. 2 is a partial plan view showing another embodiment of the invention. FIG. 3 is an overall side view of a conventional centrifugal soil testing device, FIG. 4 is a plan view thereof, and FIG. 5 is a detailed plan view showing a conventional test load bearing section.
Claims (1)
、同駆動軸に嵌合・固定された左右一対のアームと、同
アーム先端と回動自在に連結された一対のバケットと、
同バケット上に載置されその内部に試験対象としての土
または他の試験体を収納する試料箱と、同試料箱または
試験対象物に対して試験荷重を付与するアクチュエータ
とで構成され、前記バケットの１個に対して一対の試料
箱または試料箱とカウンタウェイトの組を相互の移動自
在に載置すると共に、両者の間に前記アクチュエータを
架設したことを特徴とする遠心力式土質試験装置。A drive shaft that is supported by a set of bearings and rotates in an upright state, a pair of left and right arms that are fitted and fixed to the drive shaft, and a pair of buckets that are rotatably connected to the tips of the arms.
It consists of a sample box placed on the same bucket and storing soil or other test object as a test object therein, and an actuator that applies a test load to the sample box or the test object. 1. A centrifugal force type soil testing device, characterized in that a pair of sample boxes or a set of a sample box and a counterweight are placed so as to be movable relative to each other, and the actuator is installed between the two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7096188A JPH01244366A (en) | 1988-03-25 | 1988-03-25 | Centrifugal soil testing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7096188A JPH01244366A (en) | 1988-03-25 | 1988-03-25 | Centrifugal soil testing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01244366A true JPH01244366A (en) | 1989-09-28 |
Family
ID=13446621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7096188A Pending JPH01244366A (en) | 1988-03-25 | 1988-03-25 | Centrifugal soil testing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01244366A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992022796A2 (en) * | 1991-06-11 | 1992-12-23 | Andrew N. Schofield And Associates Limited | Improvements in or relating to centrifuges and associated apparatus and methods |
-
1988
- 1988-03-25 JP JP7096188A patent/JPH01244366A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992022796A2 (en) * | 1991-06-11 | 1992-12-23 | Andrew N. Schofield And Associates Limited | Improvements in or relating to centrifuges and associated apparatus and methods |
| EP0744611A1 (en) * | 1991-06-11 | 1996-11-27 | Andrew N. Schofield And Associates Limited | Centrifuges, especially for geotechnical testing methods |
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