JP3155815U - Groundwater level measuring device - Google Patents

Groundwater level measuring device Download PDF

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JP3155815U
JP3155815U JP2009006676U JP2009006676U JP3155815U JP 3155815 U JP3155815 U JP 3155815U JP 2009006676 U JP2009006676 U JP 2009006676U JP 2009006676 U JP2009006676 U JP 2009006676U JP 3155815 U JP3155815 U JP 3155815U
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hollow rod
hollow
groundwater level
connecting member
level measuring
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哲鎬 金
哲鎬 金
悦雄 仁平
悦雄 仁平
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HOKOKU ENGINEERING CO., LTD.
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Abstract

【課題】継ぎ足し部分に段差が生じない中空ロッドを備えてなる地下水位測定装置を提供する。【解決手段】地下水位測定装置は、先端に掘進スクリュー部材を装着し、後端に掘進手段を有する中空ロッド１を備えてなる地下水位測定装置において、前記中空ロッド１は、中空の連結部材２を介して、複数の継ぎ足し中空ロッド１ａを夫々連結することにより構成する。さらに、前記連結部材２は、内径ｄ１が、前記継ぎ足し中空ロッド１ａの内径ｄ１と同一になるように形成されると共に、中央部外周には、雄ねじ部２１が刻設されてなり、前記各継ぎ足し中空ロッド１ａは、夫々、少なくとも一方の端部の内周に、前記連結部材２の一端部が当接可能な当接部１ｂと、前記雄ねじ部２１が螺合されてなる雌ねじ部１ｃと、を設けて構成する。【選択図】図２There is provided a groundwater level measuring device including a hollow rod in which a step does not occur in an added portion. A groundwater level measuring device is provided with a hollow rod 1 having a digging screw member attached to the front end and a digging means at the rear end, wherein the hollow rod 1 is a hollow connecting member 2. A plurality of additional hollow rods 1a are connected to each other via the. Further, the connecting member 2 is formed so that the inner diameter d1 is the same as the inner diameter d1 of the additional hollow rod 1a, and a male screw portion 21 is engraved on the outer periphery of the central portion, and each of the additional members is added. Each of the hollow rods 1a has an abutting portion 1b on which an end portion of the connecting member 2 can abut on an inner periphery of at least one end portion, a female screw portion 1c in which the male screw portion 21 is screwed, Is provided and configured. [Selection] Figure 2

Description

本考案は、地盤の事前調査等として地下水の状態を判定するのに利用する地下水位測定装置に関する。より好ましくは、継ぎ足し中空ロッド同士の接続構造に関する。   The present invention relates to a groundwater level measurement device used to determine the state of groundwater as a preliminary survey of the ground. More preferably, the present invention relates to a connection structure between additional hollow rods.

従来、戸建住宅の地盤調査には、ＪＩＳ規格に制定されたスウェーデン式サウンディング試験が行われている。このサウンディング試験は、図３に示すように、下端に掘進スクリュー部材（通称：スクリューポイント）３１が装着された鉄製またはステンレス鋼製の中実ロッド３を地盤Ｇに垂直に突き立て、この中実ロッド３の上部にクランプ３２及びハンドル３３を取り付ける。そして、クランプ３２上に複数枚の円盤状の錘３４（１０Ｋｇが２枚と２５ｋｇが３枚で計９５ｋｇ、載荷用クランプの重さ５ｋｇとの合計で１００ｋｇ）を順次載せて中実ロッド３の沈み込みを観察して記録する。しかし、全部の錘３４を載せた段階で中実ロッド３の沈み込みがない場合、ハンドル３３による回転で掘進させ、中実ロッド３表面の２５ｃｍ刻みの目盛り（図示せず）により、当該中実ロッド３が２５ｃｍ沈みこむのに要した回転回数を記録してゆく。なお、中実ロッド３は最長１ｍであるため、図３に示すように、複数の継ぎ足し中実ロッド３ａを継ぎ足して、所定深度（通常は地下１０ｍ）まで掘進させる。また、掘進スクリュー部材３１の基端側は中実ロッド３よりも径大になっている。図中の３５は掘進位置の地表に載置した底板である。   Conventionally, the Swedish sounding test stipulated in the JIS standard has been conducted for ground surveys of detached houses. In this sounding test, as shown in FIG. 3, a solid rod 3 made of iron or stainless steel having a digging screw member (commonly referred to as a screw point) 31 at the lower end is vertically projected to the ground G, and this solid A clamp 32 and a handle 33 are attached to the top of the rod 3. Then, a plurality of disk-shaped weights 34 (2 kg of 10 kg and 3 kg of 25 kg for a total of 95 kg and a total weight of 5 kg of the loading clamp of 100 kg) are sequentially placed on the clamp 32 and the solid rod 3 Observe and record the sinking. However, if the solid rod 3 does not sink when all the weights 34 are placed, the solid rod 3 is rotated by the rotation of the handle 33, and the solid rod 3 surface is scaled in increments of 25 cm (not shown). Record the number of rotations required for the rod 3 to sink 25 cm. Since the solid rod 3 has a maximum length of 1 m, as shown in FIG. 3, a plurality of additional solid rods 3a are added to advance to a predetermined depth (usually 10m underground). The proximal end side of the digging screw member 31 is larger in diameter than the solid rod 3. In the figure, 35 is a bottom plate placed on the ground surface at the excavation position.

しかして、このサウンディング試験では、上記の試験データを解析して土質を粘性土や砂質土等に分類するが、その試験後の引き抜いた中実ロッド３表面の濡れ度合を観察し、水濡れの位置から地下水位を判定することも行われている。しかし、このような方法では、引き抜いた中実ロッド３表面の時間経過に伴う乾きや、逆に孔壁に付いた水滴や泥等の付着により、本来の地下水による水濡れ位置が判別困難であたり、誤って判定されることも多く、地下水位の測定方法として信頼性に乏しかった。   In this sounding test, the above test data is analyzed and the soil is classified as viscous soil or sandy soil. The wetness of the surface of the solid rod 3 pulled out after the test is observed, The groundwater level is also judged from the position of However, in such a method, it is difficult to determine the position of water wetting by the original groundwater due to dryness of the surface of the drawn solid rod 3 with the passage of time and, on the contrary, adhesion of water droplets or mud attached to the hole wall. In many cases, it was judged erroneously, and it was not reliable as a method for measuring the groundwater level.

そこで、このようなスウェーデン式サウンディング試験と同時に地下水位も測定できるようにした地下水位測定装置が提案されている（特許文献１）。この測定装置は、前記同様のロッドに長さ方向一定間隔置き（通常２５ｃｍ間隔）に貫通孔（径方向の横穴）を設け、これら貫通孔にフェルトや脱脂綿の如き湿潤性部材を詰めたものであり、前記同様にスウェーデン式サウンディング試験を行った後、該ロッドを引き抜いて各貫通孔の湿潤性部材の水分吸収状態を調べて地下水位を判定するようにしている。   Thus, a groundwater level measuring apparatus has been proposed that can measure the groundwater level simultaneously with the Swedish sounding test (Patent Document 1). This measuring device is provided with through holes (radial lateral holes) at regular intervals in the length direction (usually 25 cm intervals) on the same rod as described above, and these through holes are filled with wettable members such as felt and absorbent cotton. Yes, after performing a Swedish sounding test in the same manner as described above, the rod is pulled out and the water absorption state of the wettable member in each through hole is examined to determine the groundwater level.

しかしながら、上記のスウェーデン式サウンディング試験機を利用する今までの地下水位測定装置は、大まかにしか測定できず、正確な地下水位を知ることができない上、含水比の高い地盤の場合には地下水位より上方に測定される可能性があるため、判定結果に充分な信頼性が得られず、また手間及び時間を要して作業性が悪いという難点があった。   However, conventional groundwater level measuring devices that use the Swedish sounding tester described above can only measure roughly and cannot know the exact groundwater level, and in the case of ground with a high water content, Since there is a possibility of being measured further upward, there is a problem that sufficient reliability cannot be obtained in the determination result, and labor and time are required and workability is poor.

そこで、上記問題点を解決すべく、図４に示すような、地下水位測定装置が提案されている。図４（ａ）は、中空ロッドの掘進貫入状態、（ｂ）は、１芯線の計測用絶縁ケーブルの挿入状態を示す。なお、図において中空ロッド４は、模式的に簡略化して図示している。   In order to solve the above problems, a groundwater level measuring apparatus as shown in FIG. 4 has been proposed. FIG. 4A shows a state in which the hollow rod is penetrated, and FIG. 4B shows an insertion state of the single-core measurement insulated cable. In the figure, the hollow rod 4 is schematically illustrated.

この地下水位測定装置を用いた測定方法は、図４（ａ）に示すように、先端に掘進スクリュー部材４２が装着され、さらに、長さ方向に沿って一定間隔置きに径方向に貫通する横穴４１を備え、これら横穴４１で中空部４０内と外部とが透通してなる鉄やステンレス鋼等の導電性材料からなる中空ロッド４を地盤Ｇの所定深さまで垂直に掘進貫入させる。なお、図４（ａ）では図示を省略しているが、この掘進貫入に際しては、該中空ロッド４の後端に掘進手段を設けて掘進貫入させている。すなわち、図３に示す中実ロッド３と同様にクランプ３２及びハンドル３３を取り付けると共に錘３４を載せ、該錘３４による荷重負荷とハンドル３３による回転操作によって掘進貫入させる。   As shown in FIG. 4 (a), the measuring method using this groundwater level measuring apparatus is a horizontal hole in which an excavating screw member 42 is attached to the tip and penetrates in the radial direction at regular intervals along the length direction. 41. The hollow rod 4 made of a conductive material such as iron or stainless steel through which the inside and the outside of the hollow portion 40 are pierced through the horizontal holes 41 is vertically penetrated to a predetermined depth of the ground G. In addition, although illustration is abbreviate | omitted in Fig.4 (a), at the time of this digging penetration, a digging means is provided in the rear end of this hollow rod 4, and digging penetration is carried out. That is, as with the solid rod 3 shown in FIG. 3, the clamp 32 and the handle 33 are attached and the weight 34 is placed, and the digging is performed by the load applied by the weight 34 and the rotation operation by the handle 33.

そして、中空ロッド４が帯水層ＷＺまで貫入されると、地下水位ＷＬより下位になった横穴４１から地下水Ｗが該中空ロッド４の中空部４０に浸入し、貫入停止から数分程度で該中空ロッド４内の水面ＷＦが地下水位ＷＬと同レベルに達して安定化する。   Then, when the hollow rod 4 is penetrated to the aquifer WZ, the groundwater W enters the hollow portion 40 of the hollow rod 4 from the lateral hole 41 which is lower than the groundwater level WL, and within a few minutes after the penetration is stopped. The water surface WF in the hollow rod 4 reaches the same level as the groundwater level WL and stabilizes.

次に、図４（ｂ）で示すように、電気抵抗の変化を検出する機能を備える計測器５に接続した各々１芯線からなる一対の計測用絶縁ケーブル６Ａ，６Ａ´の内、一方の絶縁ケーブル６Ａ´の先端を中空ロッド４の地上部分に電気接続し、先端側に電極部６１ａを有する他方の絶縁ケーブル６Ａを該中空ロッド４の中空部４０に上方から挿入してゆく。そして、この絶縁ケーブル６Ａの電極部６１ａが中空ロッド４内の水面ＷＦに達すると、地下水Ｗの導電性によって該電極部６１ａと電極を構成する中空ロッド４との間の電気抵抗が変化し、この電気抵抗の変化が計測器５にて検出されて表示される。   Next, as shown in FIG. 4 (b), one of the insulation cables 6A and 6A ′ for measurement consisting of one core wire connected to the measuring instrument 5 having a function of detecting a change in electrical resistance is insulated. The tip of the cable 6A ′ is electrically connected to the ground portion of the hollow rod 4, and the other insulated cable 6A having the electrode portion 61a on the tip side is inserted into the hollow portion 40 of the hollow rod 4 from above. And when the electrode part 61a of this insulated cable 6A reaches the water surface WF in the hollow rod 4, the electrical resistance between the electrode part 61a and the hollow rod 4 constituting the electrode changes due to the conductivity of the groundwater W, This change in electrical resistance is detected by the measuring instrument 5 and displayed.

したがって、この電気抵抗の変化が検出されたときの絶縁ケーブル６Ａの挿入長さから、地下水位ＷＬを正確に判定できる。すなわち、地下水位ＷＬは、前記挿入長さより、中空ロッド４の地表面ＧＬからの突出高さを差し引いた値である。   Therefore, the groundwater level WL can be accurately determined from the insertion length of the insulated cable 6A when this change in electrical resistance is detected. That is, the groundwater level WL is a value obtained by subtracting the protruding height of the hollow rod 4 from the ground surface GL from the insertion length.

特開２０００−１８０２４３JP2000-180243

図４に示す地下水位測定装置は、上記詳述したように、地下水位ＷＬを正確に判定できる点で、かなり有用なものであった。しかし、前記中空ロッド４は、図３で示した中実ロッド３と同様に継ぎ足して使用されるが、その際、その継ぎ足し部分に段差が生じ、前記絶縁ケーブル６Ａがその段差に引っかかってしまい、地下水位ＷＬを誤認するという問題が生じる場合があり、さらに有用な地下水位測定装置の開発が望まれていた。   The groundwater level measuring apparatus shown in FIG. 4 is quite useful in that the groundwater level WL can be accurately determined as described in detail above. However, the hollow rod 4 is used by being added in the same manner as the solid rod 3 shown in FIG. 3. At this time, a step is generated in the added portion, and the insulated cable 6A is caught by the step, There is a case where the problem of misidentifying the groundwater level WL may occur, and further development of a useful groundwater level measuring device has been desired.

そこで、本考案は、上記問題点に鑑み、継ぎ足し部分に段差が生じない中空ロッドを備えてなる地下水位測定装置を提供することを目的としている。   In view of the above problems, an object of the present invention is to provide a groundwater level measuring device including a hollow rod that does not cause a step in an added portion.

上記課題を解決するための手段を、後述する実施形態の参照符号を付して説明すると、請求項１の考案にかかる地下水位測定装置は、先端に掘進スクリュー部材４２を装着し、後端に掘進手段（クランプ３２、ハンドル３３、錘３４）を有する中空ロッド１を備えてなる地下水位測定装置において、
前記中空ロッド１は、中空の連結部材２を介して、複数の継ぎ足し中空ロッド１ａを夫々連結することにより構成されてなり、
前記連結部材２は、内径ｄ１が、前記継ぎ足し中空ロッド１ａの内径ｄ１と同一になるように形成されると共に、中央部外周には、雄ねじ部２１が刻設されてなり、
前記各継ぎ足し中空ロッド１ａは、夫々、少なくとも一方の端部の内周に、前記連結部材２の一端部が当接可能な当接部１ｂと、前記雄ねじ部２１が螺合されてなる雌ねじ部１ｃと、が設けられてなることを特徴としている。 Means for solving the above problems will be described with reference numerals in the embodiments described later. The groundwater level measuring device according to claim 1 is equipped with an excavating screw member 42 at the front end and at the rear end. In the groundwater level measuring device comprising the hollow rod 1 having digging means (clamp 32, handle 33, weight 34),
The hollow rod 1 is configured by connecting a plurality of additional hollow rods 1a via hollow connecting members 2, respectively.
The connecting member 2 is formed so that the inner diameter d1 is the same as the inner diameter d1 of the added hollow rod 1a, and a male screw portion 21 is engraved on the outer periphery of the central portion.
Each of the additional hollow rods 1a has a female screw portion formed by screwing the abutting portion 1b with which one end portion of the connecting member 2 can abut on the inner periphery of at least one end portion and the male screw portion 21. And 1c.

請求項２の考案は、前記請求項１に記載の地下水位測定装置において、前記中空ロッド１は、長さ方向所定間隔ｄ置きに内外を透通する横穴１１を設けてなり、該横穴１１は、上下位置で順次交互に向きが変わるように穿設されてなることを特徴としている。   The invention of claim 2 is the groundwater level measuring device according to claim 1, wherein the hollow rod 1 is provided with a lateral hole 11 that penetrates the inside and outside at predetermined intervals d in the length direction. Further, it is characterized in that it is drilled so that its direction changes alternately in the vertical position.

次に、本考案の効果について、図面の参照符号を付して説明する。請求項１の考案によれば、継ぎ足し中空ロッド１ａ同士を、連結部材２を介して連結するにあたって、まず、連結部材２の雄ねじ部２１を継ぎ足し中空ロッド１ａの端部の内周に設けられている雌ねじ部１ｃに螺合する。そして、連結部材２の一端部が、継ぎ足し中空ロッド１ａの当接部１ｂに当接するまで螺合する。すると、連結部材２の内径ｄ１は、継ぎ足し中空ロッド１ａの内径ｄ１と同一になるように形成されているから、連結部材２を介して継ぎ足し中空ロッド１ａ同士を連結したとしても、継ぎ足し中空ロッド１ａの継ぎ足し部分に、絶縁ケーブル６Ａ（図４参照）が引っかかってしまうような段差を、生じさせないようにすることができる。   Next, effects of the present invention will be described with reference numerals in the drawings. According to the first aspect of the present invention, when connecting the additional hollow rods 1a to each other via the connecting member 2, first, the male screw portion 21 of the connecting member 2 is added and provided on the inner periphery of the end of the hollow rod 1a. Screwed into the female thread portion 1c. And the one end part of the connection member 2 is added and it screws together until it contact | abuts to the contact part 1b of the hollow rod 1a. Then, since the inner diameter d1 of the connecting member 2 is formed to be the same as the inner diameter d1 of the additional hollow rod 1a, even if the additional hollow rods 1a are connected via the connecting member 2, the additional hollow rod 1a is added. It is possible to prevent a step that would cause the insulated cable 6A (see FIG. 4) from being caught in the added portion.

したがって、上記のような継ぎ足し中空ロッド１ａ及び連結部材２で構成される中空ロッド１を図４に示す地下水位測定装置で使用すれば、絶縁ケーブル６Ａを該中空ロッド１の中空部１０に上方から挿入してゆく際、絶縁ケーブル６Ａが段差に引っかかってしまい、地下水位ＷＬを誤認するということを防止することができる。   Therefore, if the hollow rod 1 composed of the additional hollow rod 1a and the connecting member 2 as described above is used in the groundwater level measuring device shown in FIG. 4, the insulated cable 6A is inserted into the hollow portion 10 of the hollow rod 1 from above. When inserting, it can prevent that the insulated cable 6A is caught in a level | step difference, and misidentifies the groundwater level WL.

請求項２の考案によれば、横穴１１は、上下位置で順次交互に向きが変わるように穿設されているから、中空ロッド１の周方向で強度の偏りが生じないように設定することが可能となる。   According to the invention of claim 2, since the horizontal holes 11 are drilled so that the directions are alternately changed in the vertical position, the horizontal holes 11 can be set so as not to cause a bias in strength in the circumferential direction of the hollow rod 1. It becomes possible.

本考案の地下水位測定装置に用いる中空ロッドを示し、（ａ）は要部の側面図、（ｂ）は（ａ）のＸ−Ｘ線の断面矢視図である。The hollow rod used for the groundwater level measuring apparatus of this invention is shown, (a) is a side view of the principal part, (b) is a cross-sectional view taken along line XX of (a). 本考案の地下水位測定装置に用いる中空ロッドを示し、（ａ）は連結部の分解縦断面図、（ｂ）は連結部の縦断面図、（ｃ）は（ｂ）のＹ−Ｙ線の断面矢視図である。The hollow rod used for the groundwater level measuring device of the present invention is shown, (a) is an exploded longitudinal sectional view of the connecting portion, (b) is a longitudinal sectional view of the connecting portion, (c) is a YY line of (b). It is a cross-sectional arrow view. スウェーデン式サウンディング試験に用いる中実ロッドの掘進貫入状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the digging penetration state of the solid rod used for a Swedish sounding test. 中空ロッドを備える地下水位測定装置を用いた地下水位の測定方法を示し、（ａ）は、中空ロッドの掘進貫入状態、（ｂ）は、１芯線の計測用絶縁ケーブルの挿入状態、のそれぞれ模式縦断面図である。1 shows a groundwater level measurement method using a groundwater level measuring device including a hollow rod, wherein (a) is a schematic diagram of a hollow rod digging penetration state, and (b) is an insertion state of a one-core measurement insulated cable. It is a longitudinal cross-sectional view.

以下、本考案に係る地下水位測定装置、特に中空ロッドの実施形態について、図面を参照して具体的に説明する。図１及び図２は本考案の地下水位測定装置に用いる中空ロッド１を示し、図１（ａ）は要部の側面図、（ｂ）はＸ−Ｘ線の断面矢視図、図２（ａ）は連結部の分解縦断面図、（ｂ）は連結部の縦断面図、（ｃ）はＹ−Ｙ線の断面矢視図である。   Hereinafter, an embodiment of a groundwater level measuring apparatus according to the present invention, in particular, a hollow rod will be specifically described with reference to the drawings. 1 and 2 show a hollow rod 1 used in the groundwater level measuring device of the present invention, FIG. 1 (a) is a side view of the main part, (b) is a sectional view taken along line XX, FIG. a) is an exploded longitudinal sectional view of the connecting portion, (b) is a longitudinal sectional view of the connecting portion, and (c) is a sectional view taken along line YY.

図１（ａ）に示すように、中空ロッド１は、その長さ方向に沿って一定間隔ｄ置きに径方向に貫通する横穴１１を備え、これら横穴１１で中空部１０内と外部とが透通すると共に、図４と同様に、先端に掘進スクリュー部材４２が装着されている。そして、その中空ロッド１の後端には、図１では図示を省略しているが、図３に示すように、クランプ３２及びハンドル３３が取り付けられ、そのクランプ３２上に複数枚の錘３４が載置されている。なお、間隔ｄは通常２５ｃｍに設定されるが、掘進スクリュー部材４２の先端から最下位の横穴１１までの距離も間隔ｄと等しくなっている。   As shown in FIG. 1 (a), the hollow rod 1 is provided with lateral holes 11 penetrating in the radial direction at regular intervals d along the length direction, and the inside and outside of the hollow portion 10 are transparent through the lateral holes 11. As in FIG. 4, an excavation screw member 42 is attached to the tip. Although not shown in FIG. 1, a clamp 32 and a handle 33 are attached to the rear end of the hollow rod 1, and a plurality of weights 34 are mounted on the clamp 32. It is placed. The distance d is normally set to 25 cm, but the distance from the tip of the digging screw member 42 to the lowest lateral hole 11 is also equal to the distance d.

横穴１１は、図１（ｂ）に示すように、上下位置で順次交互に向きが変わるように穿設されている。このように中空ロッド１に横穴１１を穿設することによって、中空ロッド１の周方向で強度の偏りが生じないように設定することが可能となる。なお、向きとしては、９０°の向きに設定するのが好ましい。   As shown in FIG. 1 (b), the horizontal holes 11 are formed so that the directions are alternately changed in the vertical position. Thus, by making the hollow hole 1 in the hollow rod 1, it is possible to set so as not to cause a bias in strength in the circumferential direction of the hollow rod 1. The orientation is preferably set to 90 °.

以上のように構成される中空ロッド１は、既述のスウェーデン式サウンディング試験に用いる中実ロッド３（図３参照）のように、複数の継ぎ足し中空ロッド１ａを連結することによって構成されている。そして、図２に示すように、継ぎ足し中空ロッド１ａ同士を連結するにあたっては、連結部材２を用いて連結されている。   The hollow rod 1 configured as described above is configured by connecting a plurality of additional hollow rods 1a, like the solid rod 3 (see FIG. 3) used in the Swedish sounding test described above. As shown in FIG. 2, the connecting hollow rods 1 a are connected to each other by using a connecting member 2.

継ぎ足し中空ロッド１ａは、図２に示すように、筒状で、図２（ａ）に示すように、内径ｄ１が、例えば６ｍｍ程度に形成されている。そして、その継ぎ足し中空ロッド１ａ端部の内周は、端面に向かうに連れて、内径ｄ２が、例えば７ｍｍ程度に拡開するラッパ形状に形成されている。さらに、このようにラッパ形状に形成される端部の内周には、連結部材２の一端部が当接される当接部１ｂが設けられ、端面側には、雌ねじ部１ｃが設けられている。   The extension hollow rod 1a is cylindrical as shown in FIG. 2, and has an inner diameter d1 of, for example, about 6 mm as shown in FIG. 2 (a). The inner periphery of the end of the added hollow rod 1a is formed in a trumpet shape in which the inner diameter d2 expands to, for example, about 7 mm as it goes toward the end surface. Furthermore, the contact part 1b with which the one end part of the connection member 2 contact | abuts is provided in the inner periphery of the edge part formed in this trumpet shape, and the internal thread part 1c is provided in the end surface side. Yes.

連結部材２は、図２に示すように、筒状で、中心孔２０を有し、中央部外周には、雄ねじ部２１が形成されている。そして、図２（ａ）に示すように、その中心孔２０の内径ｄ１は、継ぎ足し中空ロッド１ａの内径ｄ１と同一になるように形成され、例えば、６ｍｍ程度に形成されている。   As shown in FIG. 2, the connecting member 2 is cylindrical and has a center hole 20, and a male screw portion 21 is formed on the outer periphery of the center portion. As shown in FIG. 2A, the inner diameter d1 of the center hole 20 is formed to be the same as the inner diameter d1 of the added hollow rod 1a, for example, about 6 mm.

上記のように形成された連結部材２を介して、継ぎ足し中空ロッド１ａ同士を連結するには、まず、連結部材２の雄ねじ部２１を継ぎ足し中空ロッド１ａの雌ねじ部１ｃに螺合する。そして、絶縁ケーブル６Ａ（図４参照）が引っかかるような隙間が生じないように、継ぎ足し中空ロッド１ａの当接部１ｂに連結部材２の端部が当接するまで螺合する。すると、図２（ｂ）の如く、上下の継ぎ足し中空ロッド１ａの端面同士が直接に接する形で連結されることとなる。   In order to connect the added hollow rods 1a to each other via the connecting member 2 formed as described above, first, the male screw portion 21 of the connecting member 2 is added and screwed into the female screw portion 1c of the hollow rod 1a. Then, it is screwed until the end portion of the connecting member 2 comes into contact with the contact portion 1b of the hollow rod 1a so as not to generate a gap where the insulated cable 6A (see FIG. 4) is caught. Then, as shown in FIG. 2 (b), the end surfaces of the upper and lower added hollow rods 1a are connected so that the end faces are in direct contact with each other.

以上説明した本実施形態によれば、継ぎ足し中空ロッド１ａ同士を、連結部材２を介して連結するにあたって、まず、連結部材２の雄ねじ部２１を継ぎ足し中空ロッド１ａの端部の内周に設けられている雌ねじ部１ｃに螺合する。そして、絶縁ケーブル６Ａ（図４参照）が引っかかるような隙間が生じることがないように、連結部材２の一端部を、継ぎ足し中空ロッド１ａの当接部１ｂに当接するまで螺合する。すると、連結部材２の内径ｄ１は、継ぎ足し中空ロッド１ａの内径ｄ１と同一になるように形成されているから、連結部材２を介して継ぎ足し中空ロッド１ａ同士を連結したとしても、継ぎ足し中空ロッド１ａの継ぎ足し部分に、絶縁ケーブル６Ａ（図４参照）が引っかかってしまうような段差を、生じさせないようにすることができる。   According to this embodiment described above, when connecting the additional hollow rods 1a to each other via the connecting member 2, first, the male screw portion 21 of the connecting member 2 is added and provided on the inner periphery of the end of the hollow rod 1a. Screwed into the female thread portion 1c. Then, one end portion of the connecting member 2 is added and screwed in until it comes into contact with the contact portion 1b of the hollow rod 1a so that there is no gap where the insulated cable 6A (see FIG. 4) is caught. Then, since the inner diameter d1 of the connecting member 2 is formed to be the same as the inner diameter d1 of the additional hollow rod 1a, even if the additional hollow rods 1a are connected via the connecting member 2, the additional hollow rod 1a is added. It is possible to prevent a step that would cause the insulated cable 6A (see FIG. 4) from being caught in the added portion.

したがって、上記のような継ぎ足し中空ロッド１ａ及び連結部材２で構成される中空ロッド１を図４に示す地下水位測定装置で使用すれば、絶縁ケーブル６Ａを該中空ロッド１の中空部１０に上方から挿入してゆく際、絶縁ケーブル６Ａが段差に引っかかってしまい、地下水位ＷＬを誤認するということを防止することができる。   Therefore, if the hollow rod 1 composed of the additional hollow rod 1a and the connecting member 2 as described above is used in the groundwater level measuring device shown in FIG. 4, the insulated cable 6A is inserted into the hollow portion 10 of the hollow rod 1 from above. When inserting, it can prevent that the insulated cable 6A is caught in a level | step difference, and misidentifies the groundwater level WL.

なお、本実施形態においては、継ぎ足し中空ロッド１ａの一端部のみをラッパ形状に形成したものしか図示していないが、勿論、両端部をラッパ形状に形成することも可能である。   In the present embodiment, only the one end portion of the additional hollow rod 1a is formed in a trumpet shape, but it is needless to say that both end portions can be formed in a trumpet shape.

また、継ぎ足し中空ロッド１ａの端部は、継ぎ足し中空ロッド１ａ同士を、連結部材２を連結する際、段差が生じないようにする形状であればよいから、ラッパ形状でなくとも、種々の形状に設計変更可能である。   Moreover, since the end part of the additional hollow rod 1a should just be a shape which does not produce a level | step difference when connecting the connecting member 2 between the additional hollow rods 1a, even if it is not a trumpet shape, it is various shapes. The design can be changed.

一方、本実施形態において、中空ロッド１の掘進手段として、錘３４による荷重負荷とハンドル３３による回転操作との手動方式を例示したが、本考案では、荷重負荷を油圧シリンダー等による機械的加圧で行ったり、回転操作をモーター等で機械的に行う方式も採用可能である。さらに、本考案で用いる中空ロッド１としては、ＪＩＳ規格に制定されたスウェーデン式サウンディング試験機の規定寸法に合致するものに限らず、種々の内外径を有するものを採用できる。また、ロッド先端に装着する掘進スクリュー部材についても、該サウンディング試験機のスクリューポイントとは異なる形状・構造のものも使用可能である。   On the other hand, in the present embodiment, as the digging means of the hollow rod 1, a manual method of loading with the weight 34 and rotating operation with the handle 33 has been exemplified. However, in the present invention, the load is mechanically pressurized with a hydraulic cylinder or the like. It is also possible to adopt a method in which the rotation operation is mechanically performed by a motor or the like. Further, the hollow rod 1 used in the present invention is not limited to the one that matches the prescribed dimensions of the Swedish sounding tester established in the JIS standard, and may have various inner and outer diameters. Also, as the excavation screw member attached to the tip of the rod, one having a shape and structure different from the screw point of the sounding tester can be used.

１ 中空ロッド
１ａ 継ぎ足し中空ロッド
１ｂ 当接部
１ｃ 雌ねじ部
１０ 中空部
１１ 横穴
２ 連結部材
２１ 雄ねじ部
３２ クランプ（掘進手段）
３３ ハンドル（掘進手段）
３４ 錘（掘進手段）
４２ 掘進スクリュー部材
６Ａ 絶縁ケーブル
ＷＬ 地下水位
ｄ１ 内径 DESCRIPTION OF SYMBOLS 1 Hollow rod 1a Extension hollow rod 1b Contact part 1c Female thread part 10 Hollow part 11 Side hole 2 Connecting member 21 Male thread part 32 Clamp (digging means)
33 Handle (digging means)
34 weight (digging means)
42 Digging screw member 6A Insulated cable WL Groundwater level d1 Inner diameter

Claims (2)

先端に掘進スクリュー部材を装着し、後端に掘進手段を有する中空ロッドを備えてなる地下水位測定装置において、
前記中空ロッドは、中空の連結部材を介して、複数の継ぎ足し中空ロッドを夫々連結することにより構成されてなり、
前記連結部材は、内径が、前記継ぎ足し中空ロッドの内径と同一になるように形成されると共に、中央部外周には、雄ねじ部が刻設されてなり、
前記各継ぎ足し中空ロッドは、夫々、少なくとも一方の端部の内周に、前記連結部材の一端部が当接可能な当接部と、前記雄ねじ部が螺合されてなる雌ねじ部と、が設けられてなることを特徴とする地下水位測定装置。 In the groundwater level measuring device equipped with a hollow rod having a digging screw member at the tip and a digging means at the rear end,
The hollow rod is configured by connecting a plurality of additional hollow rods via a hollow connecting member,
The connecting member is formed so that the inner diameter is the same as the inner diameter of the added hollow rod, and a male screw part is engraved on the outer periphery of the center part.
Each of the additional hollow rods is provided with an abutting portion capable of abutting one end portion of the connecting member on the inner periphery of at least one end portion and a female screw portion formed by screwing the male screw portion. A groundwater level measuring device characterized by being made. 前記中空ロッドは、長さ方向所定間隔置きに内外を透通する横穴を設けてなり、該横穴は、上下位置で順次交互に向きが変わるように穿設されてなることを特徴とする請求項１に記載の地下水位測定装置。


































The hollow rod is provided with a horizontal hole penetrating the inside and outside at predetermined intervals in the length direction, and the horizontal hole is formed so as to alternately change the direction in the vertical position. The groundwater level measuring apparatus according to 1.


































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