JPH0652230B2 - Method and apparatus for measuring density distribution inside a stratified layer of granular material - Google Patents
Method and apparatus for measuring density distribution inside a stratified layer of granular materialInfo
- Publication number
- JPH0652230B2 JPH0652230B2 JP62135418A JP13541887A JPH0652230B2 JP H0652230 B2 JPH0652230 B2 JP H0652230B2 JP 62135418 A JP62135418 A JP 62135418A JP 13541887 A JP13541887 A JP 13541887A JP H0652230 B2 JPH0652230 B2 JP H0652230B2
- Authority
- JP
- Japan
- Prior art keywords
- gamma ray
- density
- pipe
- granular material
- gamma
- 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
Links
- 238000000034 method Methods 0.000 title claims description 23
- 239000008187 granular material Substances 0.000 title claims description 9
- 230000005251 gamma ray Effects 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 15
- 230000005855 radiation Effects 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 238000005056 compaction Methods 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 8
- 239000002689 soil Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000001739 density measurement Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Description
【発明の詳細な説明】 （イ）産業上の利用分野 この発明は、例えば土木分野における土壌あるいは砕石
等の粒状材料の内部密度分布を測定する方法、並びにそ
の測定装置に関する。TECHNICAL FIELD The present invention relates to a method for measuring the internal density distribution of a granular material such as soil or crushed stone in the field of civil engineering, and a measuring apparatus therefor.
（ロ）従来の技術 一般に、ダム・道路・宅地造成等の土工事においては、
重機を用いた転圧施工により、土壌の充分な締固めを行
い、土壌構造物の安定性が保持されている。(B) Conventional technology Generally, in earthworks such as dams, roads, and residential land development,
Soil compaction is sufficiently compacted by compaction construction using a heavy machine, and the stability of the soil structure is maintained.
締固めの判定には、単位容積中の乾燥密度で表される締
固め乾燥密度が用いられる。この乾燥密度は、単位体積
中の盛土質量で表わされる湿潤密度と、この土の一部を
110℃に保持された炉内で24時間乾燥させ、その前後の
重量の変化から求められる含水比（試験法は、ＪＩＳ−
Ａ1203で規定されている。）から算出される。The compaction dry density represented by the dry density in a unit volume is used for the determination of compaction. This dry density is the wet density expressed by the mass of embankment in a unit volume and a part of this soil.
It is dried in a furnace kept at 110 ° C for 24 hours, and the water content ratio (test method is JIS-
It is specified in A1203. ).
上記湿潤密度は、従来盛土表面から一層の厚さに相当す
る深さで２〜３m3の容積を持つ孔を堀削し、この孔を掘
削した時の土を、別途秤量して重量を得、一方孔の堀削
面に密着させるように水密のあるシートを敷き、この中
に注水して水で満たし、堀削した孔の容積に相当する水
の量を測定し、上記秤量で得た重量を、水で置き換えて
求めた容積で除して求める方法（水置換法）で求められ
る。The above-mentioned wet density is obtained by excavating a hole having a volume of 2 to 3 m 3 from the surface of the conventional embankment at a depth corresponding to one layer, and weighing the soil when excavating this hole to obtain the weight. , Laying a watertight sheet so that it closely adheres to the excavated surface of one hole, fill it with water and fill it with water, measure the amount of water corresponding to the volume of the excavated hole, and obtain the weight obtained by the above weighing. Is calculated by dividing by the volume obtained by replacing with water (water replacement method).
他方、表層土の密度分布を測定する技術として、ガンマ
線源を地中20〜30cmの点に埋め、地表で、そのガンマ線
量を検出する地表型ＲＩ法が知られている。On the other hand, as a technique for measuring the density distribution of the surface soil, a surface type RI method is known in which a gamma ray source is buried at a point of 20 to 30 cm in the ground and the gamma dose is detected on the surface.
また、盛土内部の密度分布を求める方法としては、ガン
マ線を放射する線源と、地中で散乱されたガンマ線を検
出する検出器を、円筒状に一体化したプロープを地表か
らボーリングによって穿たれ、所定のパイプで保護され
た孔に入れ、密度を測定する深部型ＲＩ法が利用される
ことがある。In addition, as a method of obtaining the density distribution inside the embankment, a source that emits gamma rays and a detector that detects gamma rays scattered in the ground are drilled from the surface of the ground by boring a cylindrical integrated probe. A deep RI method is sometimes used in which the density is measured by placing in a hole protected by a predetermined pipe.
（ハ）発明が解決しようとする問題点 上記した従来の密度分布測定方法のうち、水置換法によ
る現場密度の測定は、大規模な孔の堀削に多大な労力と
時間を要する。このため品質判定も転圧施工後、直ちに
行うことは不可能であり、かつ現況を破壊する試験であ
るため再転圧が必要となる。さらに、孔にシートを敷
き、堀削材料の容量を求めるのに、孔壁及び低面の凹凸
による面粗さで、シートと孔壁面との密着性が十分得ら
れず、精度の良い測定が出来ない。また、測定値がどれ
ほどの誤差を伴うかについて明確にされておらず、設計
上過大な安全率を見込む必要が生じている。(C) Problems to be Solved by the Invention Among the conventional density distribution measuring methods described above, in-situ density measurement by the water replacement method requires a great deal of labor and time for excavating a large-scale hole. For this reason, it is impossible to perform quality judgment immediately after rolling compaction, and since it is a test that destroys the current state, re- compacting is necessary. Furthermore, when laying a sheet in the hole and determining the volume of the excavating material, the surface roughness due to the unevenness of the hole wall and the low surface does not provide sufficient adhesion between the sheet and the hole wall surface, and accurate measurement is possible. Can not. In addition, it is not clear how much the measured value has an error, and it is necessary to allow an excessive safety factor in the design.
他方、基本的な非破壊の密度測定方法として、ＲＩ法が
あるが表層型ＲＩ法は、せいぜい20〜30cmまでの層厚で
あり、広範囲深層までとなると、現場測定用として、実
用的でない。これに対し深部型ＲＩ法は、元来地盤深部
の調査に用いられるものであるから盛土構築の途中段階
での品質管理には利用が困難である。つまり、粗粒の材
料を主体とする盛土での測定孔の穿孔時のボーリングパ
イプと材料壁間に大小の空隙が生じ、これら孔壁の乱れ
によって避け難い大きい誤差が生じる。On the other hand, there is an RI method as a basic non-destructive density measuring method, but the surface layer RI method has a layer thickness of at most 20 to 30 cm, and is not practical for field measurement when it reaches a wide range of depth. On the other hand, the deep RI method is originally used for the investigation of the deep part of the ground, so that it is difficult to use it for quality control in the middle stage of embankment construction. That is, large and small voids are generated between the boring pipe and the material wall when the measurement hole is bored in the embankment mainly composed of coarse-grained material, and the unavoidable large error occurs due to the disturbance of the hole wall.
このように従来、粗粒の粒状材料からなる盛土の内部密
度分布を的確に評価するる決め手がなく、そのような測
定法の開発が強く望まれている。As described above, conventionally, there is no decisive factor for accurately evaluating the internal density distribution of the embankment made of coarse-grained material, and the development of such a measurement method is strongly desired.
この発明は、上記に鑑み粗粒材料を用いる大型土木工事
における従来の密度測定法の欠点を解消し、高い精度を
確保した上で、非破壊で、しかも迅速に現場密度が求め
られる方法と、その装置を提供することを目的とする。In view of the above, the present invention eliminates the drawbacks of the conventional density measurement method in large-scale civil engineering work using coarse-grained materials, ensures high accuracy, is nondestructive, and is a method in which the on-site density is quickly required, The purpose is to provide the device.
（ニ）問題点を解決するための手段及び作用 この発明の密度分布測定装置は、少なくとも２本の固定
用の梁部材を用いて互いに所定の間隔を置いて平行に固
定保持されており、測定対象となる粒状材料の層を形成
する際に埋設される、有蓋の少なくとも２本の剛性のパ
イプと、１００μｃｉ以下の低レベルガンマ線源を固設
し、前記一方のパイプ内に蓋を外して装着される線源ホ
ルダと、先端にガンマ線検出器を固設し、前記他方のパ
イプ内に蓋を外して装着される検出器挿入ロッドと、前
記ガンマ線検出器のガンマ線検出量に応答して、測定材
料の密度を算出する密度演算手段とから構成されてい
る。(D) Means and Actions for Solving Problems The density distribution measuring device of the present invention is fixed and held in parallel with each other at a predetermined interval using at least two fixing beam members. At least two rigid pipes with a lid and a low-level gamma ray source of 100 μci or less, which are buried when forming a layer of the target granular material, are fixedly mounted, and the lid is detached and attached to one of the pipes. A radiation source holder, a gamma ray detector is fixed at the tip, and a detector insertion rod that is attached to the other pipe by removing the lid, and measurement is performed in response to the gamma ray detection amount of the gamma ray detector. And a density calculation means for calculating the density of the material.
この装置を用いて密度測定を行うのに、盛土の構築途中
の材料撤出し時に２本の梁部材で互いに平行に固定保持
された２本のパイプを埋設し、転圧施行を完了後、パイ
プの頭部だけを堀り出し、蓋を取って線源ホルダとガン
マ線検出器を挿入し、所定の高高さに保持する。線源ホ
ルダに装着された低レベルのガンマ線源より放射された
ガンマ線は、盛土内を透過しガンマ線検出器に入射す
る。この入射したガンマ線（束）の強さは、透過してき
た領域の密度に支配されるので、粗粒材料の盛土の現場
密度が算出できる。パイプの２本の空筒内での線源ホル
ダと密度検出器の位置を同時に変えることより盛土内の
密度分布を検出することができ、またパイプを盛土盤の
積層に伴って、順次継ぎ足することにより、盛土の積層
に伴う盛土層の密度変化を検出することができる。To measure the density using this device, two pipes that were fixed and held in parallel with each other by two beam members were buried during material withdrawal during the embankment construction, and after rolling compaction was completed, Only the head of the pipe is dug out, the lid is removed, the radiation source holder and the gamma ray detector are inserted, and the pipe is held at a predetermined height. Gamma rays emitted from the low-level gamma ray source mounted on the radiation source holder pass through the embankment and enter the gamma ray detector. Since the intensity of this incident gamma ray (bundle) is governed by the density of the transmitted region, the on-site density of the embankment of the coarse-grained material can be calculated. The density distribution in the embankment can be detected by changing the positions of the radiation source holder and the density detector in the two empty cylinders of the pipe at the same time. By doing so, it is possible to detect the density change of the embankment layer due to the stacking of the embankment.
上記密度測定値は、ガンマ線検出器からの出力信号を測
定時間（１分間）終了後、直ちに処理して表示されると
共に印字記録される。The density measurement value is processed and displayed immediately after the measurement of the output signal from the gamma ray detector (1 minute), and is printed and recorded.
（ホ）実施例 第１図は、この発明が実施される装置の構成図である。
同図において、１、１ａは鋼製パイプで梁部材２、２ａ
により平行に２本が固定され、鋼製枠を構成する。鋼製
パイプ１、１ａの上端には、図示していないがそれぞれ
蓋を有し、これらの蓋を外して鋼製枠の２本の鋼製パイ
プの片側１に線源ホルダ３が、他方１ａにガンマ線検出
器６がそれぞれ鋼製パイプの一端から挿入される。線源
ホルダ３には100μci以下の低レベルガンマ線源４が装
着固定されており、また、挿入ロッド５が取り付けられ
ている。ガンマ線検出器６にも挿入ロッド７が取り付け
られている。挿入ロッド７は、信号ケーブル８を通すた
め中空としている。信号ケーブル８は、アンプ・電源・
演算表示記録部９とガンマ線検出器６を接続している。(E) Embodiment FIG. 1 is a block diagram of an apparatus in which the present invention is implemented.
In the figure, 1 and 1a are steel pipes and beam members 2 and 2a.
The two are fixed in parallel with each other to form a steel frame. Although not shown, each of the upper ends of the steel pipes 1 and 1a has a lid, and these lids are removed to attach the radiation source holder 3 to one side 1 of the two steel pipes of the steel frame and the other 1a. The gamma ray detectors 6 are inserted into the respective ends of the steel pipes. A low level gamma ray source 4 of 100 μci or less is mounted and fixed to the radiation source holder 3, and an insertion rod 5 is attached. An insertion rod 7 is also attached to the gamma ray detector 6. The insertion rod 7 is hollow so that the signal cable 8 can pass therethrough. The signal cable 8 is an amplifier / power supply /
The calculation display recording unit 9 and the gamma ray detector 6 are connected.
以上の装置により密度を測定するには、被測定物質の中
に予め、鋼製枠を埋め込んでおく。そして、鋼製パイプ
１、１ａの蓋を取り、上部開口部より線源ホルダ３とガ
ンマ線検出器６を挿入し、挿入ロッド５及び７を上部開
口部で仮固定し、線源ホルダ３とガンマ線検出器６を所
定の位置（盛土内ある深さ）に保持する。その位置で低
レベルガンマ線源４からガンマ線検出器６方向に放射さ
れたガンマ線は、被測定物質を透過してガンマ線検出器
６に入射する。そして単位時間（１分間）に入射するガ
ンマ線を測定する。単位時間（１分間）に入射するガン
マ線量と密度の関係（計数比率Ｒγと湿潤密度ρｔ）
は、第２図のように予め求められ、演算装置９に記憶さ
れているので、これを参照して被測定物質の密度が算定
され、表示及び印字記録される。To measure the density with the above apparatus, a steel frame is embedded in the substance to be measured in advance. Then, the lids of the steel pipes 1 and 1a are removed, the radiation source holder 3 and the gamma ray detector 6 are inserted through the upper opening, and the insertion rods 5 and 7 are temporarily fixed in the upper opening, and the radiation source holder 3 and the gamma ray are fixed. The detector 6 is held at a predetermined position (a certain depth in the embankment). The gamma rays emitted from the low-level gamma ray source 4 toward the gamma ray detector 6 at that position pass through the substance to be measured and enter the gamma ray detector 6. Then, the gamma ray incident for a unit time (1 minute) is measured. Relationship between gamma dose and density incident per unit time (1 minute) (counting ratio Rγ and wet density ρt)
Is obtained in advance as shown in FIG. 2 and is stored in the arithmetic unit 9, so that the density of the substance to be measured is calculated with reference to this and displayed and printed.
第３図は、第１図で示す鋼製パイプ１、１ａ及び梁部材
２、２ａより構成されている鋼製枠が盛土内に埋設され
る実施手順を示した埋設手順図である。先ず、同図ａの
ように埋設予定位置近くまで材料を敷き均す。次に同図
ｂのように鋼製枠を設置する面を整形し、ｃのように鋼
製枠を置き、ｄのように鋼製枠を盛土材料で履い、その
後、所定の面積をｅのように続行して敷き均す。敷き均
しが完了した後、ｆのように所定の転圧施工を行う。FIG. 3 is an embedding procedure diagram showing an implementation procedure in which a steel frame composed of the steel pipes 1 and 1a and the beam members 2 and 2a shown in FIG. 1 is embedded in the embankment. First, as shown in a of the same figure, the material is laid evenly near the planned burying position. Next, the surface on which the steel frame is to be installed is shaped as shown in FIG. 6B, the steel frame is placed as shown in c, and the steel frame is put on with the embankment material as shown in d, and then a predetermined area is set to e. Continue and spread it. After laying and leveling is completed, a predetermined rolling compaction is performed as indicated by f.
転圧施工が終了した後、鋼製枠の上部を堀り出し、蓋を
取って開口部に線源ホルダ３とガンマ線検出器６を挿入
し、固定点位置を順次変えながら測定を行う。After the rolling compaction is completed, the upper portion of the steel frame is dug out, the lid is removed, the radiation source holder 3 and the gamma ray detector 6 are inserted into the opening, and the measurement is performed while sequentially changing the fixed point positions.
第４図は、上記実施例装置を用い、上記実施例手順によ
り得られた盛土内の密度分布の１例である。盛土の現場
密度の評価は、この密度分布を平均した値で行う。FIG. 4 is an example of the density distribution in the embankment obtained by the procedure of the above-mentioned example using the above-mentioned apparatus of the above-mentioned example. The on-site density of the embankment is evaluated by averaging this density distribution.
これら一連の現場密度測定には測定前の鋼製枠の設置を
含め一時間程度の作業量で終了させることができる上、
労力はさほど必要としない。加えて、盛土の堀削を伴わ
ない非破壊方式の測定法であるため、再転圧も容易であ
る。This series of on-site density measurements can be completed in about an hour of work including the installation of steel frames before measurement.
It does not require much labor. In addition, since it is a non-destructive measurement method that does not involve excavation of the embankment, re-rolling is easy.
積層による密度変化の検出には、先に埋設した鋼製枠に
鋼製パイプを継ぎ足し、線源ホルダ及びガンマ線検出器
の挿入口を常に盛土表面近くに保持することにより実施
できる。同様の方法により、第５図（ａ）（ｂ）（ｃ）
のように転圧施工の進歩に伴う密度変化のような経時変
化を検出することもできる。第５図（ａ）は転圧回数を
パラメータとして湿潤密度と固定点ナンバー（深さ）の
関係を示し、第５（ｂ）は、第５図（ａ）の関係を転圧
回数と湿潤密度の関係に、第５（ｃ）は転圧回数と密度
偏差の関係に置換して図示している。The density change due to stacking can be detected by adding a steel pipe to the previously embedded steel frame and always holding the insertion hole of the radiation source holder and the gamma ray detector near the embankment surface. By the same method, FIG. 5 (a) (b) (c)
As described above, it is possible to detect a change with time such as a density change accompanying the progress of rolling compaction. FIG. 5 (a) shows the relationship between the wet density and the fixed point number (depth) using the number of times of rolling as a parameter, and FIG. 5 (b) shows the relationship of FIG. 5C is replaced with the relationship between the number of times of compaction and the density deviation.
なお、上記実施例において、枠体は鋼製パイプを使用し
ているが、剛性があり、堅牢であれば他の材料のパイプ
を用いてもよい。また、パイプは２本に限られず３本以
上設け、１個のガンマン線源と数個のガンマ線検出器、
あるいは数個のガンマ線源と１個のガンマ線検出器をパ
イプ内に収納してもよい。Although the steel pipe is used as the frame body in the above-described embodiment, a pipe made of another material may be used as long as it is rigid and robust. Moreover, the number of pipes is not limited to two, and three or more pipes are provided, one Gunman radiation source and several gamma ray detectors,
Alternatively, several gamma ray sources and one gamma ray detector may be housed in the pipe.
（ヘ）発明の効果 この発明の方法及び装置によれば、構築された粗粒材料
を主体とする盛土を、一時的にも破壊することなく、密
度が迅速に測定できるので、大型土木工事の締固め管理
を即時的に実施することが可能であり、加えて転圧や積
層や降雨などによる盛土状態の変化をも検出することが
できるので、盛土の品質に対して信頼性の高い保証を行
うことができる。また、測定データの設計へのフィード
バックなど経済的な建設に寄与するところが大である。(F) Effect of the Invention According to the method and apparatus of the present invention, the density of the embankment mainly composed of the coarse-grained material can be measured quickly without even breaking it. Compaction management can be implemented immediately, and changes in the embankment state due to rolling compaction, stacking, rainfall, etc. can also be detected, so a reliable guarantee of the quality of the embankment is ensured. It can be carried out. In addition, it largely contributes to economical construction such as feedback of measurement data to the design.
なお、この発明の方法及び装置は、土木分野における土
壌、砕石などの粒状材料からなる盛土内部の密度分布だ
けでなく、セメントや小麦粉などの粉体の集合体や、化
学薬品等の流体の密度分布の測定などにも応用できる。Incidentally, the method and apparatus of the present invention, the soil in the field of civil engineering, not only the density distribution inside the embankment made of granular material such as crushed stone, aggregates of powder such as cement and wheat flour, the density of fluid such as chemicals. It can also be applied to the measurement of distribution.
第１図は実施例密度分布測定装置の構成図、第２図は同
装置のガンマ線検出器に入射するガンマ線量と密度との
関係を示す検定曲線図、第３図は実施例における鋼製枠
の埋設手順図、第４図は実施例での測定結果の一例を示
す図、第５図（ａ）（ｂ）（ｃ）は転圧による密度変化
を検出した一例を示す図である。 １：鋼製パイプ，２：梁部材， ３：線源ホルダ，４：低レベルガンマ線源， ５：線源ホルダ挿入ロッド， ６：ガンマ線検出器，７：検出器挿入ロッド， ８：信号ケーブル， ９：アンプ・電源及び演算表示記録装置。FIG. 1 is a block diagram of the density distribution measuring apparatus of the embodiment, FIG. 2 is a calibration curve diagram showing the relationship between the gamma dose incident on the gamma ray detector of the apparatus and the density, and FIG. 3 is a steel frame in the embodiment. FIG. 4 is a diagram showing an embedding procedure of FIG. 4, FIG. 4 is a diagram showing an example of a measurement result in the example, and FIGS. 1: Steel pipe, 2: Beam member, 3: Radiation source holder, 4: Low level gamma radiation source, 5: Radiation source holder insertion rod, 6: Gamma ray detector, 7: Detector insertion rod, 8: Signal cable, 9: Amplifier / power supply and calculation display recording device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 上村 洋司 岩手県盛岡市岩脇町18番地28 (72)発明者 延山 政之 大阪府吹田市藤白台５丁目10番１−403号 (56)参考文献 特開 昭59−203119（ＪＰ，Ａ) 実開 昭55−84（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoji Uemura 18-18 Iwawaki-cho, Morioka-shi, Iwate 28 (72) Masayuki Nobeyama 5-10-403 Fujishirodai, Suita-shi, Osaka (56) References Special Open Sho 59-203119 (JP, A) Actual Open Sho 55-84 (JP, U)
Claims (2)
に、少なくとも２本の固定用の梁部材で、互いに所定の
間隔をおいて平行に固定保持される少なくとも２本の剛
性の高いパイプを埋設しておき、前記粒状材料の層形成
後に、前記パイプの一方にガンマ線を放射する１００μ
ｃｉ以下の低レベルガンマ線源を、前記他方のパイプに
ガンマ線検出器を装着し、このガンマ線検出器で前記ガ
ンマ線源より放射され、パイプ周辺の領域物質中を透過
してきたガンマ線量を検出し、このガンマ線量より、粒
状材料の密度を算出するようにした粒状材料からなる成
層内部の密度分布測定方法。1. When forming a layer of a granular material to be measured, at least two high-rigidity beam members are fixed and held in parallel at a predetermined distance by at least two fixing beam members. A pipe is embedded, and after the layer of the granular material is formed, gamma rays are emitted to one side of the pipe 100 μm.
A low-level gamma ray source of less than or equal to ci and a gamma ray detector attached to the other pipe, and this gamma ray detector detects the gamma dose emitted from the gamma ray source and transmitted through the region material around the pipe. A method for measuring the density distribution inside a stratified material made of granular material, which calculates the density of the granular material from the gamma dose.
互いに所定の間隔を置いて平行に固定保持されており、
測定対象となる粒状材料の層を形成する際に埋設され
る、有蓋の少なくとも２本の剛性のパイプと、 １００μｃｉ以下の低レベルガンマ線源を固設し、前記
一方のパイプ内に蓋を外して装着される線源ホルダと、 先端にガンマ線検出器を固設し、前記他方のパイプ内に
蓋を外して装着される検出器挿入ロッドと、 前記ガンマ線検出器のガンマ線検出量に応答して、測定
材料の密度を算出する密度演算手段とからなる密度分布
測定装置。2. At least two beam members for fixing are fixed and held in parallel at a predetermined distance from each other.
At least two rigid pipes with a lid and a low-level gamma ray source of 100 μci or less, which are buried when forming a layer of granular material to be measured, are fixed, and the lid is removed from the one pipe. In response to the amount of gamma ray detected by the gamma ray detector, a radiation source holder to be attached, a gamma ray detector fixed to the tip, and a detector insertion rod attached to the other pipe with the lid removed. A density distribution measuring device comprising a density calculation means for calculating the density of a measurement material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62135418A JPH0652230B2 (en) | 1987-05-29 | 1987-05-29 | Method and apparatus for measuring density distribution inside a stratified layer of granular material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62135418A JPH0652230B2 (en) | 1987-05-29 | 1987-05-29 | Method and apparatus for measuring density distribution inside a stratified layer of granular material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63298141A JPS63298141A (en) | 1988-12-05 |
| JPH0652230B2 true JPH0652230B2 (en) | 1994-07-06 |
Family
ID=15151270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62135418A Expired - Lifetime JPH0652230B2 (en) | 1987-05-29 | 1987-05-29 | Method and apparatus for measuring density distribution inside a stratified layer of granular material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0652230B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896441B (en) * | 2018-04-11 | 2020-12-15 | 山东中烟工业有限责任公司 | A Correction Method for Detecting Density Distortion at the End of Filter Rod by Microwave Density Meter |
| JP7382292B2 (en) * | 2020-07-07 | 2023-11-16 | 鹿島建設株式会社 | How to measure the quality of structures |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59203119A (en) * | 1983-04-28 | 1984-11-17 | Kyokado Eng Co Ltd | Method and grout injection pipe for measuring injection condition of grout and grout injection control system |
-
1987
- 1987-05-29 JP JP62135418A patent/JPH0652230B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63298141A (en) | 1988-12-05 |
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