【発明の詳細な説明】（発明が属する技術分野）本発明は、締固め後若しくは締固め中の地盤の締固め程
度を測定する技術に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a technique for measuring the degree of compaction of ground after or during compaction.
（発明の課題とその特徴点）従来、土工における土の締固め程度の判定は、単位体積
重量試験により締固め土の乾燥密度を求めて行うのが一
般的であるが、単位体積重量試験は、時間とともに可な
りの労力を必要とするため、多地点での施行が困難であ
るのみならず、試験対象が締固め施工完了後の土に限ら
れるのが普通であり、本来の意味での土締固め工の品質
管理に役立ちにくい。また、単位体積重量試験は、通常
、試料採取のために地盤に孔をあけるので、破壊的試験
方法である。(Problem to be solved by the invention and its characteristics) Conventionally, the degree of compaction of soil in earthworks has generally been determined by determining the dry density of compacted soil using a unit volume weight test. Not only is it difficult to conduct tests at multiple locations because it requires a considerable amount of labor over time, but the test target is usually limited to soil after compaction has been completed, and it is difficult to conduct tests in the original sense. Not useful for quality control of soil compaction work. Additionally, unit volume weight testing is a destructive testing method because it typically involves drilling holes in the ground to collect samples.
なお、重錘を所定高さから地盤上に落下・衝突させ、衝
突時の最大加速度を検出し、これより地盤の密度を推定
する方法も知られているが（特開昭５１−１１７４０２
号参照）、加速度の波形は地盤の粒子構造の影響を受け
、必ずしも正しく地盤の密度や強さを反映するものでは
ないし、また、この従来例では、肢大加速度のほぼ一定
値が得られるまで重錘の落下を反復する（通常８回位）
ようになっており、測定の即時性と連続性に欠けている
。There is also a known method of dropping a weight from a predetermined height and colliding with the ground, detecting the maximum acceleration at the time of collision, and estimating the density of the ground from this (Japanese Patent Laid-Open No. 51-117402).
(see issue), the acceleration waveform is affected by the particle structure of the ground and does not necessarily accurately reflect the density and strength of the ground. Repeat dropping the weight (usually about 8 times)
This results in a lack of immediacy and continuity in measurement.
本発明は、締固め後の土は勿論のこと、締固め中の土で
あっても、その締固め程度を即時的、非破壊的、がっ、
連続的に測定することができる簡便な方法を提供するこ
とを目的としているものであって、その構成上の特徴は
特許請求の範囲に記載したとおりである。The present invention can instantly, non-destructively, and quickly improve the degree of compaction of not only soil after compaction, but also soil that is currently being compacted.
The object of the present invention is to provide a simple method capable of continuous measurement, and its structural features are as described in the claims.
本発明における衝撃力Ｆの検出は、重錘に装備した荷重
計で行い、地盤の応答速度Ｖの検出は、重錘に装備した
加速度計の検出値を付属の演算装置で積分して行い、Ｆ
／ ｖの計算は同じく演算装置で行うのが一般的であ
る。In the present invention, the impact force F is detected by a load meter attached to the weight, and the response speed V of the ground is detected by integrating the detected value of the accelerometer attached to the weight using an attached calculation device. F
/v is generally calculated using an arithmetic unit.
（発明の詳細な説明）−ｉに、物体に加えた力をＦ、これに対する物体の応答
速度をｖ、ＦとＶの比をＺとしたとき、２は物体の動的
なこわさく剛度）を表す。(Detailed description of the invention) - When i is the force applied to an object, F is the response speed of the object to this, and the ratio of F and V is Z, 2 is the dynamic stiffness of the object) represents.
本発明は、物体が締固め土の場合に、前記Ｚが単位体積
重量試験で求める締固め土の乾燥密度や平板載荷試験で
求める地盤係数と良い相関を示すことに着目し、Ｚを指
標として土の締固め程度を測定するようにしたものであ
る。The present invention focuses on the fact that when the object is compacted soil, Z shows a good correlation with the dry density of compacted soil determined by a unit volume weight test and the ground coefficient determined by a flat plate loading test, and uses Z as an index. It is designed to measure the degree of compaction of soil.
２を求める場合の物体の加振方法には、調和振動による
もの、ランダム振動によるもの、インパクト加振による
ものの３通りがあるが、前述のような即時的測定という
要求に対してはインパクトによる加振が最適であり、装
置も簡単であるので、本発明では、重錘を適宜高さから
自由落下させ、測定しようとする地盤に衝突させて、イ
ンパクトによる加振をしている。2, there are three ways to excite an object: harmonic vibration, random vibration, and impact vibration. Since shaking is optimal and the device is simple, in the present invention, a weight is allowed to fall freely from an appropriate height and is caused to collide with the ground to be measured to generate vibration due to the impact.
一般に、ＺＯ，Ｚｌを有する２物体の衝突時に両者の接
点間に生じる力Ｆはここで、Ｚｏを測定装置の重錘のＺ値、Ｚｌを締固め地
盤のＺ値とすれば、一般にはＺ。）Ｚ＋が成立し、（１
）式はで、Ｚｌ／ｚＯ嬌０よつ、Ｚ １＝ Ｆ ／ ｖ −−−−−−−−
−−−（２）となり、衝突時の衝撃力Ｆと地盤の応答速
度Ｖを測定して、（２）式より締固め地盤のＺ値を算定
することができる。In general, when two objects having ZO and Zl collide, the force F that occurs between the contact points of the two objects is: Here, if Zo is the Z value of the weight of the measuring device and Zl is the Z value of the compacted ground, then in general, Z . ) Z+ is established, and (1
) formula is Zl/zO嬌0yotsu, Z 1= F / v −−−−−−−−
--- (2) is obtained, and by measuring the impact force F at the time of collision and the response speed V of the ground, the Z value of the compacted ground can be calculated from equation (2).
そして、測定した締固め地盤の２値から地盤上の乾燥密
度や地盤係数を知るには、予め作成しておいた相関図を
利用すればよい。In order to know the dry density and soil coefficient of the ground from the binary values of the measured compacted ground, a correlation diagram created in advance may be used.
図面は本発明実施用装置（−例）の説明図であり、第１
図において、１は重錘、２は先端部、３は荷重計、４は
加速度計である。The drawing is an explanatory diagram of the apparatus for implementing the present invention (-example), and the first
In the figure, 1 is a weight, 2 is a tip, 3 is a load meter, and 4 is an accelerometer.
重錘１の重さは通常数誌であり、測定地盤の土質や層厚
等を考慮して適宜選定する。The weight of the weight 1 is usually several pounds, and is appropriately selected in consideration of the soil quality and layer thickness of the ground to be measured.
先端部２の下面（土との接触面）は平面にし、また、先
端部２の材質は堅固かつ軽量なジュラルミン等にするの
が好ましい。It is preferable that the lower surface of the tip part 2 (the surface in contact with the soil) be flat, and that the material of the tip part 2 be made of hard and lightweight duralumin or the like.
荷重計３と加速度計４は圧電型センサであり、荷重計３
は２〜３個、加速度計４は１個設ける。The load cell 3 and the accelerometer 4 are piezoelectric sensors, and the load cell 3
Two to three accelerometers are provided, and one accelerometer 4 is provided.
第２図において、５はデータ処理部、６は表示部、７は
記憶・再生部である。In FIG. 2, 5 is a data processing section, 6 is a display section, and 7 is a storage/reproduction section.
データ処理部５では、荷重計データの加算、加速度デー
タの積分による速度データへの変換、前記（２）式によ
るＺｌの計算を行う。The data processing section 5 adds load meter data, converts acceleration data into velocity data by integrating it, and calculates Zl using the above equation (2).
表示部６は液晶ディスプレイ等であり、オペレーターに
測定結果を知らせるようになっている。The display section 6 is a liquid crystal display or the like, and is designed to inform the operator of the measurement results.
記憶・再生部７は表示部６に接続され、記憶している各
データや計算結果を再生して表示部６に送れるようにな
っている。The storage/reproduction section 7 is connected to the display section 6 so that it can reproduce stored data and calculation results and send them to the display section 6.
以上のような装置を例えばロードローラで牽引される車
両上に設置し、ロードローラを進行させつつ、適宜機構
で重錘１の引上げ・落下を繰返し行うことにより、地盤
の締固め作業と並行して締固め程度の測定を連続的に行
うことができる。For example, by installing the above-mentioned device on a vehicle towed by a road roller, and repeatedly lifting and dropping the weight 1 using an appropriate mechanism while moving the road roller, it is possible to perform soil compaction work in parallel with the ground compaction work. The degree of compaction can be measured continuously.
（発明の効果）本発明は以上のようなものであるから、下記のような諸
効果が期待できる。(Effects of the Invention) Since the present invention is as described above, the following effects can be expected.
即時的に土の締固め程度を判定することができ、測定結
果のフィードバックにより締固め地盤の的確な品質管理
が可能である。The degree of compaction of soil can be determined instantly, and accurate quality control of compacted ground is possible by feedback of measurement results.
非破壊測定であるので、測定地盤を乱すことがない。Since it is a non-destructive measurement, the measurement ground is not disturbed.
連続的測定が可能であり、従来の点的な管理と異なり、
面的な管理を行うことができ、締固め地盤の品質のバラ
ツキが小さくなり、均質な締固めを行うことができる。Continuous measurement is possible, unlike traditional point management,
Area management can be performed, variations in the quality of the compacted ground are reduced, and homogeneous compaction can be performed.
測定値Ｚ１は、入力（加振力）と出力（速度応答）の比
であることから、重錘の落下高さの影響を受けず、装置
的にも、また操作的にも簡便化が図れる。Since the measured value Z1 is the ratio of the input (excitation force) to the output (velocity response), it is not affected by the falling height of the weight and can be simplified both in terms of equipment and operation. .
図面は本発明実施用装置の説明図であり、第１図は重錘
の側面図、第２図はデータ処理のブロック線図である。なお、図中、１は重錘、２は先端部、３は荷重計、４は
加速度計、５はデータ処理部、６は表示部、７は記憶・
再生部である。代理人弁理士 染 谷 廣 司第１図第２図The drawings are explanatory diagrams of an apparatus for implementing the present invention; FIG. 1 is a side view of a weight, and FIG. 2 is a block diagram of data processing. In the figure, 1 is a weight, 2 is a tip, 3 is a load cell, 4 is an accelerometer, 5 is a data processing section, 6 is a display section, and 7 is a memory/memory section.
This is the reproduction department. Representative Patent Attorney Hiroshi Sometani Figure 1 Figure 2
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62143906AJP2523324B2 (en) | 1987-06-09 | 1987-06-09 | How to measure the degree of compaction of the ground |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62143906AJP2523324B2 (en) | 1987-06-09 | 1987-06-09 | How to measure the degree of compaction of the ground |
| Publication Number | Publication Date |
|---|---|
| JPS63308110Atrue JPS63308110A (en) | 1988-12-15 |
| JP2523324B2 JP2523324B2 (en) | 1996-08-07 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62143906AExpired - LifetimeJP2523324B2 (en) | 1987-06-09 | 1987-06-09 | How to measure the degree of compaction of the ground |
| Country | Link |
|---|---|
| JP (1) | JP2523324B2 (en) |
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