JP3877389B2 - Soil surface hardness measuring device and measuring method - Google Patents

Soil surface hardness measuring device and measuring method Download PDF

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Publication number
JP3877389B2
JP3877389B2 JP25508997A JP25508997A JP3877389B2 JP 3877389 B2 JP3877389 B2 JP 3877389B2 JP 25508997 A JP25508997 A JP 25508997A JP 25508997 A JP25508997 A JP 25508997A JP 3877389 B2 JP3877389 B2 JP 3877389B2
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Japan
Prior art keywords
soil surface
shaft
hardness
soil
fixed
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JP25508997A
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JPH1194723A (en
Inventor
洋 西村
和信 林
隆志 後藤
光広 堀尾
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National Agriculture and Food Research Organization
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National Agriculture and Food Research Organization
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Description

【０００１】
【発明の属する技術分野】
本発明は、作物栽培に適した土壌硬度の調整を行うために、圃場の土壌表面の硬度測定を迅速、簡易にかつ精度良く行うことができる土壌表面硬度測定装置及び測定方法に関する。
【０００２】
【従来の技術】
例えば、代掻を行う湛水水稲直播においては、苗立ち及びその後の生育の均一化、耐倒伏性の向上などのために、カルパーコーティングした種子については、５〜１５ｍｍ程度の播種深さを確保することが推奨されている。しかし、現状では、圃場の表面硬度（表層０〜５ｃｍ程度）の違いによって播種深さが大きく異なっている。そのため、播種時の土壌表面硬度を直播用機械の特性に合わせた硬さに調整したり、機械側が土壌表面硬度に応じて播種部の設定を変更することなどが考えられるが、いずれの場合も土壌表面硬度を正確かつ簡易に測定することが必要とされている。
【０００３】
【発明が解決しようとする課題】
代掻あとなどの軟らかい土壌表面硬度の測定については、これまで、下げ振り（円錐コーン）を圃場表面より１ｍまたは１０ｃｍの高さから落下させたり、ゴルフボールを１ｍの高さから落下させて、その貫入深さから土壌表面硬度を測定しているが、前者では深く貫入し過ぎるため、表層だけを測定対象とすることが難しく、また後者では貫入深さが表面水の影響を受けやすい、といった問題点があった。
【０００４】
そこで本発明は、土壌表面硬度測定装置を土壌表面の硬さに応じて貫入深さが変化する感知部を、先端が土壌表面と接する位置から落下させる方式として、表層の硬さを精密に測定することができるようにする。また、感知部の固定及び落下、さらに貫入深さの読み取りが簡易にできる構造とし、かつ軽量に構成して、測定者が片手で全てを操作でき、圃場内の測定が迅速・簡易かつ精密に行うことができるようにした測定装置及び測定方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記の目的を達成するために、本発明の土壌表面硬度測定装置は、軟らかい土壌表面に静置される装置フレーム（１）に、土壌表面の硬さに応じて貫入深さが変わる円錐状の感知部（２）と、この感知部（２）の上部に固設されて上方に延びるシャフト（３）と、このシャフト（３）を常時は固定し測定時に解放する挟持部（５）と、該シャフト（３）の移動量を表示する表示部（６）と、を備えた土壌表面硬度測定装置であって、上記装置フレーム（１）の底面に接地圧５ｇ／ｃｍ 2 以下の基準底面（１ａ）を形成し、上記挟持部（５）は、上記感知部（２）の先端を上記基準底面（１ａ）と同一高さになるように上記シャフト（３）を固定可能であり、上記基準底面（１ａ）を土壌表面に静置することによって、上記感知部（２）の先端を土壌表面に接する位置に固定し、上記挟持部（５）の作動によって、上記シャフト（３）の固定を解放して上記感知部（２）を自然落下させて土壌中に貫入させ、このときの貫入深さにより土壌表面の硬度を測定することを特徴とする。
【０００６】
また、本発明の土壌表面硬度測定方法は、軟らかい土壌表面に静置される装置フレーム（１）に、土壌表面の硬さに応じて貫入深さが変わる円錐状の感知部（２）と、この感知部（２）の上部に固設されて上方に延びるシャフト（３）と、このシャフト（３）を常時は固定し測定時に解放する挟持部（５）と、該シャフト（３）の移動量を表示する表示部（６）と、を備えた土壌表面硬度測定装置であって、上記装置フレーム（１）の底面に接地圧５ｇ／ｃｍ 2 以下の基準底面（１ａ）を形成し、上記挟持部（５）は、上記感知部（２）の先端を上記基準底面（１ａ）と同一高さになるように上記シャフト（３）を固定可能であり、上記基準底面（１ａ）を土壌表面に静置することによって、上記感知部（２）の先端を土壌表面に接する位置に固定し、上記挟持部（５）の作動によって、上記シャフト（３）の固定を解放して上記感知部（２）を自然落下させて土壌中に貫入させ、このときの貫入深さにより土壌表面の硬度を測定することを特徴とする。
【０００７】
【作用】
上記の構成及び手段によって本発明の土壌表面硬度測定装置及び測定方法は、次のような作用をする。
▲１▼．測定装置は、軟らかい土壌表面に静置される装置フレーム１に、土壌表面の硬さに応じて貫入深さが変化する円錐状の感知部２と、この感知部２の上部に固設されて上方に延びるシャフト３と、このシャフト３を常時は固定し測定時に解放する挟持部５と、該シャフト３の移動量を表示する表示部６とを備えていることで、簡単な構造で軽量小型に構成でき、測定者は片手で全てを操作できる。
【０００８】
▲２▼．感知部２の先端が、測定しようとする土壌表面に接する高さになるように挟持部５によりシャフト３を固定し、その後シャフト３の固定を解放して感知部２を自然落下させて土壌中に貫入させ、このときの貫入深さにより土壌表面の硬度を測定することで、土壌表面の硬度を精密に測定することができる。
【０００９】
▲３▼．土壌表面硬度測定装置の接地圧を、軟らかい土壌表面でも沈下することのない５ｇ／ｃｍ2 以下とし、上記装置フレーム１の基準底面１ａと上記感知部２の先端を同一高さとして、土壌表面硬度測定装置を土壌表面に静置することによって、感知部２の先端を精度良く土壌表面に接する位置に固定可能とすることで、圃場内の測定が迅速・簡易かつ精密に行うことができる。
【００１０】
【発明の実施の形態】
以下、本発明の一実施形態を添付の図面に基づいて具体的に説明する。
図１において、符号１は軟らかい土壌表面に静置されて使用される土壌表面硬度測定装置の装置フレームで、この装置フレーム１に、土壌表面の硬さに応じて貫入深さが変化する円錐状の感知部２と、この感知部２の上部に固設されて上方に延びるシャフト３と、このシャフト３を常時は固定し測定時に解放する挟持部５と、該シャフト３の移動量を表示する表示部６と、を設けている。挟持部５がシャフト３を固定し、固定を解放する動作は電磁ソレノイド４により行われ、この電磁ソレノイド４の操作は固定解放ボタン７により行われる。
【００１１】
上記装置フレーム１は、この実施例では薄い鋼板製のフレームを立方体形状に連結したものである。その接地底面（基準底面）１ａは、軟らかい土壌条件でも基準底面として沈み込まない５ｇ／ｃｍ2 以下とし、上記装置フレーム１の基準底面１ａと上記感知部２の先端を同一高さとして、土壌表面硬度測定装置を土壌表面に静置することによって、感知部２の先端を精度良く土壌表面に接する位置に固定可能にしている。この基準底面１ａの形状は種々のものが考えられる。
【００１２】
上記感知部２の円錐形状部は、この実施例では質量１１４ｇ、円錐角度４４．５°、円錐高さ５５ｍｍである。この感知部２は、例えば、代掻後数日を経過して、ある程度安定した条件では上記仕様のもので対応できるが、代掻後間もない条件では、質量を減じたり、円錐高さを増大させたり、円錐角度を大きくしたものが有効であり、上記仕様のものに限定されるものではない。
【００１３】
上記挟持部５は、図３に示すように、ケース５ｂに内装したバネ５ａによって常時は上記シャフト３を側方から押圧して固定し、上記装置フレーム１から延長可能の固定・解放ボタン７の操作により電磁ソレノイド４のプランジャ４ａを作動させて上記バネ５ａの押圧を解除するように構成している。
【００１４】
また、図４に示すように、装置フレーム１に取付けたフレキシブルシャフト８の先端を電磁ソレノイド４のプランジャ４ａに接続し、該フレキシブルシャフト８の基端部から装置フレーム１の上側に解放ボタン８ａを突出させ、この解放ボタン８ａを操作して電磁ソレノイド４を介して挟持部５を作動させるようにしてもよいものである。
【００１５】
上記表示部６は、図１の実施例では、シャフト３の上部に表示目盛りを刻設し、挟持部５に立設した支柱に設けた指示針６ａにより読み取るようにしているが、これを図２及び図４に示すように、シャフト３に指示針６ａを取付け、挟持部５に立設した支柱に表示目盛りを刻設して指示針６ａにより読み取るようにしてもよいものである。
【００１６】
このような構成の土壌表面硬度測定装置においては、簡単な構造であり、小型軽量であるので、測定者は片手で装置フレーム１を持って測定圃場表面に基準底面１ａを接地させ、固定・解放ボタン７または解放ボタン８ａを操作して、電磁ソレノイド４を介して感知部２の先端が、測定しようとする土壌表面に接する高さになるように挟持部５によりシャフト３を固定し、その後シャフト３の固定を解放して感知部２を自然落下させて土壌中に貫入させ、このときの貫入深さを表示部６で読み取り、土壌表面の硬度を測定する。
【００１７】
【発明の効果】
以上説明したように本発明の土壌表面硬度測定装置及び測定方法によれば、以下の効果を奏する。
▲１▼．測定装置は、軟らかい土壌表面に静置される装置フレーム１に、土壌表面の硬さに応じて貫入深さが変わる円錐状の感知部２と、この感知部２の上部に固設されて上方に延びるシャフト３と、このシャフト３を常時は固定し測定時に解放する挟持部５と、該シャフト３の移動量を表示する表示部６とを備えており、簡単な構造であり軽量小型に構成することができる。そして、測定者は測定装置を片手で持って全ての操作を行うことができる。
【００１８】
▲２▼．感知部２の先端が、測定しようとする土壌表面に接する高さになるように挟持部５によりシャフト３を固定し、その後シャフト３の固定を解放して感知部２を自然落下させて土壌中に貫入させ、このときの貫入深さにより土壌表面の硬度を測定するので、土壌表面の硬度を簡易にかつ精密に測定することができる。
【００１９】
▲３▼．土壌表面硬度測定装置の接地圧を、軟らかい土壌表面でも沈下することのない５ｇ／ｃｍ2 以下とし、上記装置フレーム１の基準底面１ａと上記感知部２の先端を同一高さとして、土壌表面硬度測定装置を土壌表面に静置することによって、感知部２の先端を精度良く土壌表面に接する位置に固定可能としたので、圃場内の測定が迅速・簡易かつ精密に行うことができる。
【図面の簡単な説明】
【図１】本発明による土壌表面硬度測定装置の正面図である。
【図２】同表示部の他の実施例の正面図である。
【図３】同挟持部の断面図である。
【図４】同挟持部の他の実施例を示す土壌表面硬度測定装置の部分断面図である。
【符号の説明】
１ 装置フレーム １ａ 接地底面（基準底面）
２ 感知部
３ シャフト
４ 電磁ソレノイド ４ａ プランジャ
５ 挟持部 ５ａ バネ ５ｂ ケース
６ 表示部 ６ａ 指示針
７ 固定・解放ボタン
８ フレキシブルシャフト ８ａ 解放ボタン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a soil surface hardness measurement apparatus and a measurement method that can quickly, easily and accurately measure the hardness of a soil surface in a field in order to adjust soil hardness suitable for crop cultivation.
[0002]
[Prior art]
For example, in direct sowing of flooded paddy rice, the sowing depth of 5 to 15 mm is secured for calper-coated seeds for uniform seedling and subsequent growth, improvement of lodging resistance, etc. It is recommended to do. However, at present, the seeding depth varies greatly depending on the difference in the surface hardness of the field (surface layer of about 0 to 5 cm). Therefore, it is possible to adjust the soil surface hardness at the time of sowing to a hardness that matches the characteristics of the direct sowing machine, or the machine side can change the setting of the sowing part according to the soil surface hardness, but in either case There is a need to accurately and easily measure soil surface hardness.
[0003]
[Problems to be solved by the invention]
For the measurement of soft soil surface hardness such as aftercutting, until now, a downward swing (cone cone) is dropped from a height of 1 m or 10 cm from the field surface, or a golf ball is dropped from a height of 1 m, The soil surface hardness is measured from the penetration depth, but it is difficult to measure only the surface layer in the former because it penetrates too deeply, and the penetration depth is easily affected by surface water in the latter. There was a problem.
[0004]
Therefore, the present invention accurately measures the hardness of the surface layer by using a soil surface hardness measuring device as a method of dropping a sensing unit whose penetration depth changes according to the hardness of the soil surface from a position where the tip contacts the soil surface. To be able to. In addition, the sensor unit can be fixed and dropped, and the depth of penetration can be easily read, and it is light in weight so that the operator can operate everything with one hand, making measurements in the field quick, simple and precise. It is an object of the present invention to provide a measuring apparatus and a measuring method that can be performed.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the soil surface hardness measuring device of the present invention is a conical shape in which the penetration depth varies depending on the hardness of the soil surface on the device frame (1) placed on the soft soil surface. A sensing unit (2), a shaft (3) fixed to the upper part of the sensing unit (2) and extending upward, and a clamping unit (5) that always fixes the shaft (3) and releases it at the time of measurement; A soil surface hardness measuring device comprising a display unit (6) for displaying the amount of movement of the shaft (3), and a reference bottom surface having a ground pressure of 5 g / cm 2 or less on the bottom surface of the device frame (1). 1a), and the clamping part (5) can fix the shaft (3) so that the tip of the sensing part (2) is at the same height as the reference bottom face (1a). The tip of the sensing unit (2) by placing the bottom surface (1a) on the soil surface It is fixed at a position in contact with the soil surface, and by the operation of the clamping part (5), the fixing of the shaft (3) is released and the sensing part (2) is allowed to fall naturally and penetrate into the soil. It is characterized in that the hardness of the soil surface is measured by the penetration depth.
[0006]
Further, the soil surface hardness measurement method of the present invention comprises a device frame (1) placed on a soft soil surface, a cone-shaped sensing unit (2) whose penetration depth changes according to the hardness of the soil surface, A shaft (3) fixed to the upper part of the sensing part (2) and extending upward, a clamping part (5) that is fixed at all times and released during measurement, and movement of the shaft (3) A soil surface hardness measuring device comprising a display unit (6) for displaying the amount, wherein a reference bottom surface (1a) having a ground pressure of 5 g / cm 2 or less is formed on the bottom surface of the device frame (1) , The clamping part (5) can fix the shaft (3) so that the tip of the sensing part (2) is at the same height as the reference bottom face (1a), and the reference bottom face (1a) is fixed to the soil surface. Position where the tip of the sensing part (2) is in contact with the soil surface By fixing and releasing the shaft (3) by the operation of the clamping part (5), the sensing part (2) is allowed to fall naturally and penetrate into the soil, and the soil surface depends on the penetration depth at this time It is characterized by measuring the hardness.
[0007]
[Action]
The soil surface hardness measuring apparatus and measuring method of the present invention operate as follows by the above-described configuration and means.
(1). The measuring device is fixed to a device frame 1 that is placed on a soft soil surface, a conical sensor 2 whose penetration depth changes according to the hardness of the soil surface, and an upper part of the sensor 2. It has a simple structure and is lightweight and compact by including an upwardly extending shaft 3, a clamping portion 5 that is always fixed and released during measurement, and a display portion 6 that displays the amount of movement of the shaft 3. The measurer can operate everything with one hand.
[0008]
(2). The shaft 3 is fixed by the clamping unit 5 so that the tip of the sensing unit 2 is in contact with the soil surface to be measured, and then the fixing of the shaft 3 is released and the sensing unit 2 is allowed to fall naturally in the soil. The hardness of the soil surface can be measured precisely by measuring the hardness of the soil surface according to the penetration depth at this time.
[0009]
(3). The ground pressure of the soil surface hardness measuring device is set to 5 g / cm 2 or less so as not to sink even on the soft soil surface, and the reference bottom surface 1a of the device frame 1 and the tip of the sensing unit 2 are set at the same height, and the soil surface hardness By allowing the measuring device to stand on the soil surface, the tip of the sensing unit 2 can be fixed at a position in contact with the soil surface with high accuracy, so that the measurement in the field can be performed quickly, easily and precisely.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In FIG. 1, reference numeral 1 denotes a device frame of a soil surface hardness measurement device that is used while being placed on a soft soil surface. The device frame 1 has a conical shape whose penetration depth changes according to the hardness of the soil surface. The detection unit 2, the shaft 3 fixed on the upper part of the detection unit 2 and extending upward, the clamping unit 5 that is always fixed and released during measurement, and the amount of movement of the shaft 3 is displayed. And a display unit 6. The operation of the clamping unit 5 fixing the shaft 3 and releasing the fixing is performed by the electromagnetic solenoid 4, and the operation of the electromagnetic solenoid 4 is performed by the fixing release button 7.
[0011]
In this embodiment, the apparatus frame 1 is a thin steel plate frame connected in a cubic shape. The ground bottom surface (reference bottom surface) 1a is 5 g / cm 2 or less which does not sink as a reference bottom surface even under soft soil conditions, and the reference bottom surface 1a of the device frame 1 and the tip of the sensing unit 2 are at the same height. By placing the hardness measuring device on the soil surface, the tip of the sensing unit 2 can be fixed at a position in contact with the soil surface with high accuracy. Various shapes of the reference bottom surface 1a can be considered.
[0012]
In this embodiment, the cone-shaped portion of the sensing unit 2 has a mass of 114 g, a cone angle of 44.5 °, and a cone height of 55 mm. For example, this sensing unit 2 can cope with the above specifications under a condition that is stable to some extent after a few days after chamfering. Increasing or increasing the cone angle is effective, and is not limited to the above specification.
[0013]
As shown in FIG. 3, the clamping portion 5 is fixed by pressing and fixing the shaft 3 from the side at all times by a spring 5 a built in the case 5 b, and can be extended from the device frame 1. By operation, the plunger 4a of the electromagnetic solenoid 4 is operated to release the pressure of the spring 5a.
[0014]
Further, as shown in FIG. 4, the distal end of the flexible shaft 8 attached to the device frame 1 is connected to the plunger 4 a of the electromagnetic solenoid 4, and a release button 8 a is provided above the device frame 1 from the base end portion of the flexible shaft 8. The clamping unit 5 may be operated via the electromagnetic solenoid 4 by operating the release button 8a.
[0015]
In the embodiment shown in FIG. 1, the display unit 6 is provided with a display scale on the upper portion of the shaft 3 and is read by the indicator needle 6 a provided on the support column erected on the clamping unit 5. As shown in FIG. 2 and FIG. 4, the indicator needle 6 a may be attached to the shaft 3, and a display scale may be engraved on a support column erected on the holding portion 5 so as to be read by the indicator needle 6 a.
[0016]
The soil surface hardness measuring apparatus having such a structure is simple in structure and small and light, so that the measurer holds the apparatus frame 1 with one hand and grounds the reference bottom surface 1a on the surface of the measurement field to fix / release. By operating the button 7 or the release button 8a, the shaft 3 is fixed by the clamping unit 5 so that the tip of the sensing unit 2 is in contact with the soil surface to be measured via the electromagnetic solenoid 4, and then the shaft 3 3 is released and the sensing unit 2 is allowed to fall naturally and penetrate into the soil. The penetration depth at this time is read by the display unit 6 and the hardness of the soil surface is measured.
[0017]
【The invention's effect】
As described above, according to the soil surface hardness measuring device and the measuring method of the present invention, the following effects can be obtained.
(1). The measuring device is composed of a device frame 1 that is placed on a soft soil surface, a conical sensing unit 2 whose penetration depth changes according to the hardness of the soil surface, and an upper part fixed to the upper part of the sensing unit 2. A shaft 3 that extends in a straight line, a clamping portion 5 that is always fixed and released at the time of measurement, and a display portion 6 that displays the amount of movement of the shaft 3. can do. Then, the measurer can perform all operations by holding the measuring device with one hand.
[0018]
(2). The shaft 3 is fixed by the clamping unit 5 so that the tip of the sensing unit 2 is in contact with the soil surface to be measured, and then the fixing of the shaft 3 is released and the sensing unit 2 is allowed to fall naturally in the soil. Since the hardness of the soil surface is measured by the penetration depth at this time, the hardness of the soil surface can be measured easily and precisely.
[0019]
(3). The ground pressure of the soil surface hardness measuring device is set to 5 g / cm 2 or less so as not to sink even on the soft soil surface, and the reference bottom surface 1a of the device frame 1 and the tip of the sensing unit 2 are set at the same height, and the soil surface hardness By allowing the measuring device to stand on the soil surface, the tip of the sensing unit 2 can be accurately fixed at a position in contact with the soil surface, so that the measurement in the field can be performed quickly, easily and accurately.
[Brief description of the drawings]
FIG. 1 is a front view of a soil surface hardness measuring apparatus according to the present invention.
FIG. 2 is a front view of another embodiment of the display unit.
FIG. 3 is a cross-sectional view of the holding portion.
FIG. 4 is a partial cross-sectional view of a soil surface hardness measuring apparatus showing another embodiment of the holding part.
[Explanation of symbols]
1 Equipment frame 1a Grounding bottom (reference bottom)
2 Sensing unit 3 Shaft 4 Electromagnetic solenoid 4a Plunger 5 Nipping unit 5a Spring 5b Case 6 Display unit 6a Pointer 7 Fixing / release button 8 Flexible shaft 8a Release button

Claims (2)

軟らかい土壌表面に静置される装置フレーム（１）に、土壌表面の硬さに応じて貫入深さが変わる円錐状の感知部（２）と、この感知部（２）の上部に固設されて上方に延びるシャフト（３）と、このシャフト（３）を常時は固定し測定時に解放する挟持部（５）と、該シャフト（３）の移動量を表示する表示部（６）と、を備えた土壌表面硬度測定装置であって、
上記装置フレーム（１）の底面に接地圧５ｇ／ｃｍ 2 以下の基準底面（１ａ）を形成し、
上記挟持部（５）は、上記感知部（２）の先端を上記基準底面（１ａ）と同一高さになるように上記シャフト（３）を固定可能であり、
上記基準底面（１ａ）を土壌表面に静置することによって、上記感知部（２）の先端を土壌表面に接する位置に固定し、上記挟持部（５）の作動によって、上記シャフト（３）の固定を解放して上記感知部（２）を自然落下させて土壌中に貫入させ、このときの貫入深さにより土壌表面の硬度を測定することを特徴とする土壌表面硬度測定装置。A device frame (1) that is placed on a soft soil surface is fixed to a conical sensing part (2) whose penetration depth changes according to the hardness of the soil surface, and an upper part of the sensing part (2). A shaft (3) extending upward, a clamping part (5) that is always fixed and released at the time of measurement, and a display part (6) that displays the amount of movement of the shaft (3). A soil surface hardness measuring device provided ,
Forming a reference bottom surface (1a) having a ground pressure of 5 g / cm 2 or less on the bottom surface of the device frame (1) ;
The clamping part (5) can fix the shaft (3) so that the tip of the sensing part (2) is at the same height as the reference bottom surface (1a),
By fixing the reference bottom surface (1a) on the soil surface, the tip of the sensing part (2) is fixed at a position in contact with the soil surface, and the operation of the clamping part (5) causes the shaft (3) to A soil surface hardness measuring apparatus characterized by measuring the hardness of the soil surface according to the penetration depth at this time by releasing the fixation and allowing the sensing unit (2) to fall naturally and penetrate into the soil. 軟らかい土壌表面に静置される装置フレーム（１）に、土壌表面の硬さに応じて貫入深さが変わる円錐状の感知部（２）と、この感知部（２）の上部に固設されて上方に延びるシャフト（３）と、このシャフト（３）を常時は固定し測定時に解放する挟持部（５）と、該シャフト（３）の移動量を表示する表示部（６）と、を備えた土壌表面硬度測定装置を用い、
上記土壌表面硬度測定装置は、上記装置フレーム（１）の底面に接地圧５ｇ／ｃｍ 2 以下の基準底面（１ａ）を形成すると共に、上記挟持部（５）によって上記感知部（２）の先端が上記基準底面（１ａ）と同一高さになるように上記シャフト（３）が固定され、
上記基準底面（１ａ）を土壌表面に静置することによって、上記感知部（２）の先端を土壌表面に接する位置に固定し、上記挟持部（５）の作動によって、上記シャフト（３）の固定を解放して上記感知部（２）を自然落下させて土壌中に貫入させ、このときの貫入深さにより土壌表面の硬度を測定することを特徴とする土壌表面硬度測定方法。 A device frame (1) that is placed on a soft soil surface is fixed to a conical sensing part (2) whose penetration depth changes according to the hardness of the soil surface, and an upper part of the sensing part (2). A shaft (3) extending upward, a clamping part (5) that is always fixed and released at the time of measurement, and a display part (6) that displays the amount of movement of the shaft (3). Using the soil surface hardness measuring device provided,
The soil surface hardness measuring device forms a reference bottom surface (1a) having a ground pressure of 5 g / cm 2 or less on the bottom surface of the device frame (1), and the tip of the sensing unit (2) by the sandwiching portion (5). The shaft (3) is fixed so that is at the same height as the reference bottom surface (1a),
By fixing the reference bottom surface (1a) on the soil surface, the tip of the sensing part (2) is fixed at a position in contact with the soil surface, and the operation of the clamping part (5) causes the shaft (3) to A soil surface hardness measurement method comprising: releasing the fixation, allowing the sensing unit (2) to fall naturally and penetrating into the soil, and measuring the hardness of the soil surface based on the penetration depth at this time .
JP25508997A 1997-09-19 1997-09-19 Soil surface hardness measuring device and measuring method Expired - Fee Related JP3877389B2 (en)

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