JP2015132589A - Method of measuring underground radiation dose using flexible boring machine - Google Patents

Method of measuring underground radiation dose using flexible boring machine Download PDF

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JP2015132589A
JP2015132589A JP2014005576A JP2014005576A JP2015132589A JP 2015132589 A JP2015132589 A JP 2015132589A JP 2014005576 A JP2014005576 A JP 2014005576A JP 2014005576 A JP2014005576 A JP 2014005576A JP 2015132589 A JP2015132589 A JP 2015132589A
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radiation dose
drilling
boring machine
measurement
underground
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JP6231888B2 (en
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崇寛 山内
Takahiro Yamauchi
崇寛 山内
敦士 川西
Atsushi Kawanishi
敦士 川西
勇太 坂藤
Yuta Sakafuji
勇太 坂藤
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Maeda Corp
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Maeda Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method of measuring underground radiation dose using a flexible boring machine, which allows for measuring a greater range in one measurement and safely making measurements in a high dose area from a low dose area.SOLUTION: An underground radiation dose measurement method includes; a drilling step for drilling a hole by pushing a string of drill pipes 20 into underground of a target area 70 for underground radiation dose measurement from outside the target area 70 using a flexible boring machine 10; and a measurement step for sending down a position detector 40 and a radiation dosimeter 50 to a front end section of the drill pipe string 20, and making continuous measurement of underground radiation dose while pulling out the position detector 40 and the radiation dosimeter 50 together with the drill pipe string 20. Underground radiation dose in the target area is three-dimensionally measured by repeating the drilling step and measurement step at different hole depths and hole positions drilled by the drill pipe string 20.

Description

本発明は、自在ボーリングマシンを用いた地中内放射線量測定装置に関するものであり、鉛直方向のボーリングを行うことなく、測定対象領域から離れた場所で地中内の放射線量を測定することが可能な自在ボーリングマシンを用いた地中内放射線量測定方法に関するものである。   The present invention relates to an underground radiation dose measuring apparatus using a free boring machine, and can measure the radiation dose in the ground at a location away from a measurement target region without performing vertical boring. The present invention relates to an underground radiation dose measuring method using a free boring machine.

従来、地中内の放射線量を測定するには、例えば、測定対象領域において、鉛直方向にボーリングを行い、ボーリング孔内に放射線測定装置を挿入して放射線量を測定していた。また、測定対象領域の地表面に浅い穴を掘って放射線量を測定し、当該測定値に基づいて想定対象地域の放射能量を推定していた（例えば、特許文献１参照）。   Conventionally, in order to measure the radiation dose in the ground, for example, boring was performed in the vertical direction in the measurement target region, and the radiation dose was measured by inserting a radiation measurement device into the borehole. Moreover, the radiation dose was measured by digging a shallow hole in the ground surface of the measurement target region, and the radioactivity amount in the assumed target region was estimated based on the measurement value (see, for example, Patent Document 1).

この特許文献１に記載された技術は、地中で得られた特定核種による放射線量の値の和（放射線量の面積）を調査地域の土地利用形態によって異なる値である換算係数で除算することにより、その核種の放射能量を推定するようになっている。具体的には、地中５０ｃｍ程度の深さの穴（直径２．５ｃｍ程度）の中で測定された特定核種の放射線量の値の和を、調査地域の土地利用データ（森林、耕作地、未耕地に分類）の換算係数で除算することにより、その場所の放射能量を推定している。   The technique described in Patent Document 1 divides the sum of radiation dose values (radiation dose area) by specific nuclides obtained in the ground by a conversion factor that is a different value depending on the land use form in the survey area. Thus, the radioactivity of the nuclide is estimated. Specifically, the sum of radiation dose values of specific nuclides measured in a hole with a depth of about 50 cm in the ground (about 2.5 cm in diameter) is used as the land use data (forest, cultivated land, By dividing by the conversion factor of (classified as uncultivated land), the amount of radioactivity at that location is estimated.

特開２００２−２１４３４８号公報JP 2002-214348 A

しかし、上述した特許文献１に記載された技術は、地表面付近の放射線量を測定するものであり、地中内の放射線量を直接測定することはできない。すなわち、測定対象領域の全体（地中の深い位置）の放射線量を測定することはできなかった。   However, the technique described in Patent Document 1 described above measures the radiation dose in the vicinity of the ground surface, and cannot directly measure the radiation dose in the ground. That is, the radiation dose of the entire measurement target region (deep position in the ground) could not be measured.

また、鉛直方向にボーリングを行う方法では、１回のボーリングで放射線量を測定可能な範囲は限られている。また、高線量区域における測定では、作業時間に制限があるため、十分な調査を行うことができない。   Further, in the method of boring in the vertical direction, the range in which the radiation dose can be measured by one boring is limited. In addition, measurements in high-dose areas cannot be conducted sufficiently due to limited work time.

本発明は、上述した事情に鑑み提案されたもので、１回の測定における測定範囲を拡大することができ、また、高線量区域に対して、低線量区域から安全に計測を実施することが可能な自在ボーリングマシンを用いた地中内放射線量測定方法を提供することを目的とする。   The present invention has been proposed in view of the above-described circumstances, can extend the measurement range in one measurement, and can safely measure from a low-dose area to a high-dose area. An object of the present invention is to provide an underground radiation dose measuring method using a possible boring machine.

本発明の自在ボーリングマシンを用いた地中内放射線量測定方法は、上述した目的を達成するため、以下の特徴を有している。すなわち、本発明の自在ボーリングマシンを用いた地中内放射線量測定方法は、地中内放射線量の測定対象領域外から、当該測定対象領域の地中に自在ボーリングマシンにより削孔管を圧入して削孔を行う削孔工程と、削孔管の先端部に位置計測器と放射線量計測器とを送り込み、削孔管とともに位置計測器及び放射線量計測器を引き抜きながら、連続して地中内放射線量を測定する測定工程とを含む。そして、削孔管による削孔深度及び削孔位置を変更して、削孔工程及び測定工程を繰り返すことにより、測定対象領域の地中内における放射線量を３次元的に測定することを特徴とするものである。   The underground radiation dose measuring method using the free boring machine of the present invention has the following features in order to achieve the above-described object. That is, in the underground radiation dose measuring method using the free boring machine of the present invention, the drilling pipe is press-fitted by the free boring machine into the ground of the measurement target region from outside the measurement target region of the underground radiation dose. Drilling process, drilling the position measuring instrument and radiation dose measuring instrument to the tip of the drilling pipe, and pulling out the position measuring instrument and radiation dose measuring instrument together with the drilling pipe, Measuring step of measuring the internal radiation dose. And, by changing the drilling depth and drilling position by the drilling tube and repeating the drilling process and the measurement process, the radiation dose in the ground of the measurement target region is measured three-dimensionally. To do.

また、上述した構成からなる自在ボーリングマシンを用いた地中内放射線量測定方法において、削孔管の先端部に試料採取装置を配置し、適宜箇所において、地中から試料を採取することが可能である。   In addition, in the underground radiation dose measurement method using the flexible boring machine having the above-described configuration, it is possible to collect a sample from the ground at an appropriate location by placing a sample collection device at the tip of the bore tube It is.

本発明の自在ボーリングマシンを用いた地中内放射線量測定方法によれば、測定対象領域が高線量区域であっても、測定対象領域外の低線量区域からから、自在ボーリングマシンを用いて削孔を行うことにより地中内放射線量の測定を行うので、作業時間に余裕ができ、十分な調査を行うことができる。   According to the underground radiation dose measuring method using the free boring machine of the present invention, even if the measurement target area is a high-dose area, the low-dose area outside the measurement target area can be used for cutting using the free boring machine. Since the radiation dose in the ground is measured by making a hole, the working time can be afforded and sufficient investigation can be performed.

また、自在ボーリングマシンは、測定対象領域の地中において略水平方向に削孔を行うことができるので、１回のボーリングで広範囲にわたって放射線量の測定を行うことができる。さらに、削孔管による削孔深度及び削孔位置を変更して放射線量の測定を行い、測定対象領域の地中内における放射線量を３次元的に測定するため、測定対象領域における放射線量分布を容易に把握することができる。   Moreover, since the boring machine can drill holes substantially horizontally in the ground of the measurement target region, it can measure the radiation dose over a wide range by one boring. Furthermore, in order to measure the radiation dose by changing the drilling depth and the drilling position by the drilling tube and measuring the radiation dose in the ground of the measurement target region three-dimensionally, the radiation dose distribution in the measurement target region Can be easily grasped.

本発明の実施形態に係る地中内放射線量測定方法における地中内放射線量測定手順を示す説明図。Explanatory drawing which shows the underground radiation dose measuring procedure in the underground radiation dose measuring method which concerns on embodiment of this invention. 本発明の実施形態に係る地中内放射線量測定方法に用いる自在ボーリングマシンの模式図。The schematic diagram of the free boring machine used for the underground radiation dose measuring method which concerns on embodiment of this invention. 本発明の実施形態に係る地中内放射線量測定方法に用いる自在ボーリングマシンの先端ビットの模式図。The schematic diagram of the front-end | tip bit of the free boring machine used for the underground radiation dose measuring method which concerns on embodiment of this invention.

以下、図面を参照して、本発明に係る自在ボーリングマシンを用いた地中内放射線量測定方法の実施形態を説明する。図１〜図３は本発明の実施形態に係る自在ボーリングマシンを用いた地中内放射線量測定方法を説明するもので、図１は地中内放射線量測定手順を示す説明図、図２は自在ボーリングマシンの模式図、図３は先端ビットの模式図である。   Hereinafter, an embodiment of the underground radiation dose measuring method using the universal boring machine according to the present invention will be described with reference to the drawings. 1 to 3 illustrate an underground radiation dose measuring method using a universal boring machine according to an embodiment of the present invention. FIG. 1 is an explanatory diagram showing an underground radiation dose measuring procedure, and FIG. Fig. 3 is a schematic diagram of a free boring machine, and Fig. 3 is a schematic diagram of a tip bit.

＜自在ボーリングマシン＞
本発明で使用する自在ボーリングマシン１０は、従来から公知のものを利用することができる。この自在ボーリングマシン１０は、図２に示すように、基台１１と、基台１１上に載置され、削孔管２０を接続及び切断するための接続切断装置１２と、削孔管２０の挿入角度を調整するための角度調整装置１３と、削孔管２０を推進するための推進駆動装置１４とを備えている。また、自在ボーリングマシン１０の後方には、位置計測器４０（例えば、ジャイロセンサ）及び放射線量計測器５０に接続された信号ケーブル６０を巻き取るためのウインチ１５が配置されている。 <Swivel boring machine>
As the universal boring machine 10 used in the present invention, a conventionally known machine can be used. As shown in FIG. 2, the universal boring machine 10 is mounted on a base 11, a connection cutting device 12 that is placed on the base 11, connects and disconnects the drilling tube 20, and the drilling tube 20. An angle adjusting device 13 for adjusting the insertion angle and a propulsion drive device 14 for propelling the drilled tube 20 are provided. Further, a winch 15 for winding the signal cable 60 connected to the position measuring device 40 (for example, a gyro sensor) and the radiation dose measuring device 50 is disposed behind the universal boring machine 10.

＜先端ビット＞
削孔管２０の先端部には、先端ビット３０が取り付けられている。この先端ビット３０は、図３に示すように、先端部が先細状となるようなテーパー部３１を有しており、直線削孔時には、削孔管２０及び先端ビット３０を回転させながら削孔し、曲線削孔時には、削孔管２０及び先端ビット３０を回転させない状態で地盤中に圧入して、先端ビット３０のテーパー部３１に作用する土圧により曲線推進するようになっている。また、先端ビット３０には、位置計測器４０及び放射線量計測器５０を挿通するための挿通孔３２を設けてある。さらに、図示しないが、先端ビット３０の先端部に、削孔管２０を介して送出されるベントナイト泥水等の掘削補助液を噴出させるための噴出口と、削孔管２０の内部と噴出口とを連通するための送出管とが設けられている。 <Tip bit>
A tip bit 30 is attached to the tip of the drill tube 20. As shown in FIG. 3, the tip bit 30 has a tapered portion 31 whose tip is tapered, and during straight drilling, the drill bit 20 and the tip bit 30 are rotated while drilling. At the time of curve drilling, the hole drill tube 20 and the tip bit 30 are pressed into the ground without being rotated, and the curve is propelled by earth pressure acting on the tapered portion 31 of the tip bit 30. Further, the tip bit 30 is provided with an insertion hole 32 through which the position measuring instrument 40 and the radiation dose measuring instrument 50 are inserted. Further, although not shown in the drawings, a jet outlet for ejecting a drilling auxiliary liquid such as bentonite mud sent out through the drilling pipe 20 to the tip portion of the tip bit 30, an inside of the drilling pipe 20, and a jet outlet And a delivery pipe for communicating with each other.

＜位置計測器＞
上述した信号ケーブル６０は、位置計測器４０及び放射線量計測器５０からの信号を受信するためと、位置計測器４０及び放射線量計測器５０を削孔管２０内へ送り込むとともに、位置計測器４０及び放射線量計測器５０を削孔管２０内から引き抜くために使用する。なお、圧縮空気等の圧縮流体を用いて位置計測器４０及び放射線量計測器５０を削孔管２０内へ送り込む構造としてもよい。このような構成とした場合には、信号ケーブル６０を細くして、ウインチ１５を小型化することができる。 <Position measuring instrument>
The signal cable 60 described above receives signals from the position measuring instrument 40 and the radiation dose measuring instrument 50, and sends the position measuring instrument 40 and the radiation dose measuring instrument 50 into the drilled tube 20. And the radiation dose measuring instrument 50 is used for extracting from the inside of the drilling tube 20. In addition, it is good also as a structure which sends the position measuring device 40 and the radiation dose measuring device 50 into the drilling tube 20 using compressed fluids, such as compressed air. In the case of such a configuration, the signal cable 60 can be thinned and the winch 15 can be downsized.

＜放射線量計測器＞
放射線量計測器５０は、公知の計器を用いることができる。なお、本発明では、削孔管２０の先端部に位置計測器４０及び放射線量計測器５０を送り込む必要があるため、位置計測器４０及び放射線量計測器５０を一体とし、削孔管２０内へ挿入可能で、かつ屈曲部を通過可能な直径及び長さを有する形状（例えば、棒状）としている。 <Radiation dose measuring instrument>
A known instrument can be used as the radiation dose measuring instrument 50. In the present invention, since it is necessary to send the position measuring instrument 40 and the radiation dose measuring instrument 50 to the tip of the drilling pipe 20, the position measuring instrument 40 and the radiation dose measuring instrument 50 are integrated into the drilling pipe 20. The shape (for example, rod shape) which has a diameter and a length which can be inserted in and can pass through the bent portion.

＜試料採取装置＞
試料採取装置は、地中から試料を採取できればどのような構造であってもよいが、例えば、図３に示すように、先端ビット３０の側面に凹部３３を設け、凹部３３の開放部に開閉蓋３４を設けるとともに、開閉蓋３４を開閉するための開閉機構（例えば、開閉蓋３４に接続したワイヤー等）を設ければよい。このような構成の試料採取装置では、試料を採取する位置で開閉蓋３４を開いて凹部３３内に試料を取り込む。そして、開閉蓋３４を閉めて凹部３３内に試料を収納し、削孔管２０を引き抜くことにより試料を回収する。 <Sample collection device>
The sample collection device may have any structure as long as it can collect a sample from the ground. For example, as shown in FIG. 3, a recess 33 is provided on the side surface of the tip bit 30, and the opening and closing of the recess 33 is opened and closed. In addition to providing the lid 34, an opening / closing mechanism (for example, a wire connected to the opening / closing lid 34) for opening / closing the opening / closing lid 34 may be provided. In the sample collecting device having such a configuration, the opening / closing lid 34 is opened at the position where the sample is collected, and the sample is taken into the recess 33. Then, the open / close lid 34 is closed, the sample is stored in the recess 33, and the holed tube 20 is pulled out to collect the sample.

また、図示しないが、削孔管２０の内部に挿入可能な箱状部材と、削孔管２０の内部に箱状部材を挿入して引き抜くためのワイヤーとにより、試料採取装置を形成してもよい。このような形状の試料採取装置においても、箱状部材に開閉蓋を設け、試料を採取する位置で開閉蓋を開いて箱状部材内に試料を取り込み、開閉蓋を閉めて箱状部材内に試料を収納することができる。   Although not shown, even if the sampling device is formed by a box-shaped member that can be inserted into the drilled tube 20 and a wire for inserting and extracting the box-shaped member into the drilled tube 20, Good. Even in the sample collecting apparatus having such a shape, an opening / closing lid is provided on the box-shaped member, the opening / closing lid is opened at the position where the sample is collected, the sample is taken into the box-shaped member, and the opening / closing lid is closed, A sample can be stored.

＜放射線量測定方法＞
次に、図１を参照して、本発明の自在ボーリングマシン１０を用いた地中内放射線量測定の手順について説明する。本発明の自在ボーリングマシン１０を用いた地中内放射線量測定では、測定対象領域７０から離れた位置に自在ボーリングマシン１０を設置する。 <Radiation dose measuring method>
Next, with reference to FIG. 1, the procedure of underground radiation dose measurement using the universal boring machine 10 of the present invention will be described. In the underground radiation dose measurement using the free boring machine 10 of the present invention, the free boring machine 10 is installed at a position away from the measurement target region 70.

そして、自在ボーリングマシン１０の接続切断装置１２により削孔管２０を接続しながら、推進駆動装置１４により削孔管２０を地盤中に貫入して、先端ビット３０により削孔を行う（図１（ａ）（ｂ））。   Then, while the drilling tube 20 is connected by the connection cutting device 12 of the universal boring machine 10, the drilling tube 20 is penetrated into the ground by the propulsion drive device 14 and drilled by the tip bit 30 (FIG. 1 ( a) (b)).

削孔が終了したら、削孔管２０内へ位置計測器４０（ジャイロセンサ）及び放射線量計測器５０を挿入して、位置計測器４０（ジャイロセンサ）及び放射線量計測器５０を先端ビット３０の位置まで到達させる（図１（ｃ）（ｄ））。   When the drilling is completed, the position measuring instrument 40 (gyro sensor) and the radiation dose measuring instrument 50 are inserted into the drilling pipe 20, and the position measuring instrument 40 (gyro sensor) and the radiation dose measuring instrument 50 are inserted into the tip bit 30. The position is reached (FIGS. 1C and 1D).

この状態から、削孔管２０とともに位置計測器４０（ジャイロセンサ）及び放射線量計測器５０を引き抜きながら、位置計測器４０（ジャイロセンサ）の軌跡（計測位置の軌跡）及び放射線量を測定する（図１（ｅ））。信号ケーブル６０は、コンピュータ（図示せず）に接続されており、コンピュータにより位置計測器４０（ジャイロセンサ）の引き込み軌跡（計測位置の軌跡）及び放射線量の測定結果を演算処理して、ディスプレイ装置等に表示する。   From this state, while extracting the position measuring device 40 (gyro sensor) and the radiation dose measuring device 50 together with the drilled tube 20, the locus (measurement position locus) and the radiation dose of the position measuring device 40 (gyro sensor) are measured ( FIG. 1 (e)). The signal cable 60 is connected to a computer (not shown), and the computer processes the pull-in trajectory (measurement position trajectory) of the position measuring device 40 (gyro sensor) and the measurement result of the radiation dose by the computer to display the display device. Etc.

次に、削孔深度及び削孔位置を変更して上述した工程を繰り返すことにより、放射線量の測定を行うべき測定対象領域７０の全域にわたって３次元的に測定値を求める（図１（ｆ））。   Next, by changing the drilling depth and the drilling position and repeating the above-described steps, the measurement value is obtained three-dimensionally over the entire measurement target region 70 where the radiation dose should be measured (FIG. 1 (f)). ).

なお、測定結果を表示する際には、測定対象領域７０における放射線量の分布を容易に把握することができるように、放射線量の分布を３次元表示することが好ましい。３次元表示するための演算処理は、コンピュータにインストールしたプログラムにより実施することができる。   When displaying the measurement result, it is preferable to display the radiation dose distribution three-dimensionally so that the radiation dose distribution in the measurement target region 70 can be easily grasped. Arithmetic processing for three-dimensional display can be performed by a program installed in a computer.

１０ 自在ボーリングマシン
１１ 基台
１２ 接続切断装置
１３ 角度調整装置
１４ 推進駆動装置
１５ ウインチ
２０ 削孔管
３０ 先端ビット
３１ テーパー部
３２ 挿通孔
３３ 凹部
３４ 開閉蓋
４０ 位置計測器
５０ 放射線量計測器
６０ 信号ケーブル
７０ 測定対象領域 DESCRIPTION OF SYMBOLS 10 Universal boring machine 11 Base 12 Connection cutting device 13 Angle adjustment device 14 Propulsion drive device 15 Winch 20 Drilling tube 30 Tip bit 31 Taper part 32 Insertion hole 33 Concave part 34 Opening and closing cover 40 Position measuring instrument 50 Radiation dose measuring instrument 60 Signal Cable 70 Measurement area

Claims (2)

地中内放射線量の測定対象領域外から、当該測定対象領域の地中に自在ボーリングマシンにより削孔管を圧入して削孔を行う削孔工程と、
前記削孔管の先端部に位置計測器と放射線量計測器とを送り込み、前記削孔管とともに前記位置計測器及び前記放射線量計測器を引き抜きながら、連続して地中内放射線量を測定する測定工程とを含み、
前記削孔管による削孔深度及び削孔位置を変更して、前記削孔工程及び前記測定工程を繰り返すことにより、前記測定対象領域の地中内における放射線量を３次元的に測定する、
ことを特徴とする自在ボーリングマシンを用いた地中内放射線量測定方法。 A drilling step of performing drilling by pressing a drill tube into the ground of the measurement target area from outside the measurement target area of the underground radiation dose by a free boring machine,
A position measuring instrument and a radiation dose measuring instrument are fed to the tip of the drilling pipe, and the underground radiation dose is continuously measured while pulling out the position measuring instrument and the radiation dose measuring instrument together with the drilling pipe. Including a measurement process,
By changing the drilling depth and drilling position by the drilling tube and repeating the drilling step and the measurement step, the radiation dose in the ground of the measurement target region is measured three-dimensionally,
An underground radiation dose measuring method using a free boring machine characterized by the above. 削孔管の先端部に試料採取装置を配置し、適宜箇所において、地中から試料を採取することを特徴とする請求項１に記載の自在ボーリングマシンを用いた地中内放射線量測定方法。   2. The underground radiation dose measuring method using the universal boring machine according to claim 1, wherein a sampling device is disposed at the tip of the drilling tube, and a sample is collected from the ground at an appropriate location.
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