JP5303767B2 - Sampling device for ground improvement body and sampling method using the same - Google Patents

Sampling device for ground improvement body and sampling method using the same Download PDF

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JP5303767B2
JP5303767B2 JP2011232454A JP2011232454A JP5303767B2 JP 5303767 B2 JP5303767 B2 JP 5303767B2 JP 2011232454 A JP2011232454 A JP 2011232454A JP 2011232454 A JP2011232454 A JP 2011232454A JP 5303767 B2 JP5303767 B2 JP 5303767B2
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俊彦 藤井
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Description

この発明は、軟弱地盤や建物等の構築に際して地中に設けられる柱状地盤改良体のサンプリング装置とこれを用いたサンプリング方法に関する。   The present invention relates to a sampling device for a columnar ground improvement body provided in the ground when a soft ground or a building is constructed, and a sampling method using the sampling device.

地中に設けられる柱状地盤改良体の施工においては、形成された柱状地盤改良体の品質を確認すると共にこれを管理するため、柱状地盤改良体の形成物を試料として採取することが行われている。   In the construction of the columnar ground improvement body provided in the ground, in order to confirm the quality of the formed columnar ground improvement body and to manage it, the formation of the columnar ground improvement body is taken as a sample. Yes.

従来のサンプリング装置は、先端に閉塞栓を設けた採取管に取り込み口を設け、この取り込み口を外開き可能となる蓋部材で開閉自在とした構造を有し、サンプリングを行うには、取り込み口を蓋部材で閉じた採取管を柱状地盤改良体に対して挿入し、所定深さの挿入状態で前記採取管に回転を与え、この回転により蓋部材を開位置に移動させて取り込み口を開き、この取り込み口から柱状地盤改良体の形成物を採取管内に取り込み、この後、採取管を引抜くようにしている（例えば、特許文献１参照）。   A conventional sampling device has a structure in which a sampling port provided with a blocking plug at the tip is provided with an intake port, and the intake port can be opened and closed with a lid member that can be opened outside. The sampling tube closed with a lid member is inserted into the columnar ground improvement body, and the sampling tube is rotated in the inserted state with a predetermined depth, and this rotation moves the lid member to the open position to open the intake port. The formation of the columnar ground improvement body is taken into the collection tube from this intake port, and then the collection tube is pulled out (see, for example, Patent Document 1).

また、別のサンプリング装置としては、柱状地盤改良体に挿入する回転ロッドの外周に複数のサンプリング容器を放射状の配置で取付け、柱状地盤改良体内でサンプリング容器を回動させることにより、柱状地盤改良体の形成物をサンプリング容器内にその取り込み口から採取するものが提案されている（例えば、特許文献２又は３参照）。   In addition, as another sampling device, a plurality of sampling containers are attached in a radial arrangement on the outer periphery of a rotating rod inserted into the columnar ground improvement body, and the sampling container is rotated in the columnar ground improvement body, whereby the columnar ground improvement body (2) For example, Patent Document 2 or 3 has been proposed.

特開平６−１２８９３１号公報JP-A-6-128931 特開２００８−２８０８１７号公報JP 2008-280817 A 特開２００１−３１７０３４号公報JP 2001-317034 A

ところで、各特許文献で示したサンプリング装置は、何れも、柱状地盤改良体内に挿入した状態で回転させて採取する構造であるため、その回転駆動に大型作業機械が必要になり、施工コストが高くつくことになる。   By the way, all the sampling devices shown in each patent document are structured to be rotated and collected while being inserted into the columnar ground improvement body, so a large work machine is required for the rotational drive, and the construction cost is high. I will make it.

また、何れのサンプリング装置も、柱状地盤改良体の上下軸方向に対して採取位置が部分的となり、柱状地盤改良体の上下軸方向に沿った連続性のあるサンプリングを行うことができず、十分な品質管理ができないという問題がある。   In addition, in any sampling device, the sampling position becomes partial with respect to the vertical axis direction of the columnar ground improvement body, and it is not possible to perform continuous sampling along the vertical axis direction of the columnar ground improvement body. There is a problem that quality control is not possible.

そこで、この発明の課題は、回転駆動を必要とすることなくサンプリングが行えると共に、柱状地盤改良体の上下軸方向に沿った連続性のあるサンプリングが可能な地盤改良体のサンプリング装置とこれを用いたサンプリング方法を提供することにある。   Therefore, an object of the present invention is to provide a sampling device for a ground improvement body that can perform sampling without requiring a rotational drive, and that can perform continuous sampling along the vertical axis direction of the columnar ground improvement body, and the same. It is to provide a sampling method.

上記のような課題を解決するため、サンプリング装置の発明は、先端に閉塞栓を着脱自在に取付けた採取管に複数の採取口を軸方向に点在して設け、前記採取管を軸方向に沿って複数に分割可能な構造とし、この採取管に対してサヤ管を軸方向に抜き差し自在となるよう外嵌したものである。   In order to solve the above-described problems, the invention of the sampling device is provided with a plurality of sampling ports scattered in the axial direction in a sampling tube in which a closing plug is detachably attached to the tip, and the sampling tube is arranged in the axial direction. A structure that can be divided into a plurality of parts along the outer periphery of the sampling tube is provided so that the sheath tube can be inserted and removed in the axial direction.

上記採取管が鋼管を用いて形成され、上記サヤ管が金属管又は塩化ビニルパイプの何れかで形成されている構造とすることができる。   The sampling pipe may be formed using a steel pipe, and the sheath pipe may be a metal pipe or a vinyl chloride pipe.

また、サンプリング方法の発明は、請求項１又は２に記載のサンプリング装置を用い、先端に閉塞栓を取付けた採取管に対してサヤ管を外嵌した状態のサンプリング装置を、地盤改良体がその形成物に流動性がある状態でこの地盤改良体に対して所定の深度まで挿入し、所定の深度に到達したらサヤ管だけを引抜くことで採取管を残し、サヤ管の引上げにより下位の採取口から順に開放していき、開放された各採取口の部分で地盤改良体の形成物を採取管内に取り込み、その後、地盤改良体から採取管を引抜くようにするものである。   Moreover, the invention of the sampling method uses the sampling device according to claim 1 or 2, and the ground improvement body has a sampling device in a state in which a sheath tube is externally fitted to a sampling tube having a stopper plug attached to the tip. When the formation is fluid, insert it into the ground improvement body to a predetermined depth, and when it reaches the predetermined depth, pull out only the Saya tube to leave the sampling tube, and pull the Saya tube up to collect the lower level. It is opened in order from the mouth, and the formation of the ground improvement body is taken into the sampling pipe at each open sampling port, and then the sampling pipe is pulled out from the ground improvement body.

ここで、上記採取管は、サンプリングに必要な長さを有する鋼管を軸方向に沿って一対の半割り管に二つ割にしたものであり、両半割り管は、円筒状に組合わせ状態で先端側を閉塞栓に螺合し、上端側を結束部材で縛ることで円筒状が保持され、前記両半割り管には、上下軸方向に所定の間隔で複数の採取口が、前記両半割り管で上下に交互の配置となるように設けられている。   Here, the sampling pipe is a steel pipe having a length necessary for sampling divided into a pair of half pipes along the axial direction, and both half pipes are combined in a cylindrical shape. The cylindrical shape is held by screwing the distal end side to the closure plug and tying the upper end side with a binding member, and the two split pipes have a plurality of sampling ports at predetermined intervals in the vertical axis direction. It is provided so that it may be alternately arranged in the top and bottom with a half pipe.

上記閉塞栓は、内周に採取管をねじ込むための雌ねじを設けた円筒体と、この円筒体の下部に着脱自在となるよう螺合した先端部材とで形成され、この閉塞栓は、サンプリング装置を地盤改良体内に挿入するときのウエイトになり、地盤改良体の性状や挿入深さに合わせた重さの先端部材を選択使用できるようになっている。   The closure plug is formed of a cylindrical body provided with an internal thread for screwing the sampling tube on the inner periphery thereof, and a tip member screwed to the lower portion of the cylindrical body so as to be detachable. Is used as a weight when inserting into the ground improvement body, and a tip member having a weight according to the properties and insertion depth of the ground improvement body can be selected and used.

上記サヤ管を形成する金属管又は塩化ビニルパイプは、採取管と同程度の長さを有し、内径が採取管に対して丁度適合し、外径が閉塞栓の最大外径に略一致するかそれよりも小径になるように設定され、採取管に対して上下動させることにより採取口を開閉することになる。   The metal pipe or vinyl chloride pipe forming the above-mentioned sheath pipe has the same length as the sampling pipe, the inner diameter just fits the sampling pipe, and the outer diameter substantially matches the maximum outer diameter of the blocking plug. Or the diameter is set to be smaller than that, and the sampling port is opened and closed by moving up and down with respect to the sampling tube.

この発明によると、先端に閉塞栓を着脱自在に取付けた採取管に複数の採取口を軸方向に点在して設け、この採取管に対してサヤ管を軸方向に抜き差し自在となるよう外嵌したので、地盤改良体に挿入した状態でサヤ管だけを引抜けば、採取管の内部に地盤改良体の形成物を取り込むことができ、構造が簡単で上下軸方向に抜き差しするだけでよいので作業の施工性がよくなり、また、回転駆動を必要とすることなくサンプリングが可能になり、施工に大型作業機械を用いることなくサンプリングが行えることになる。   According to the present invention, a plurality of sampling ports are provided in the sampling tube having a stopper plug detachably attached to the tip, and the sampling tube is inserted into and removed from the sampling tube in an axial direction. Because it is fitted, if only the Saya tube is pulled out while being inserted into the ground improvement body, the formation of the ground improvement body can be taken into the sampling pipe, the structure is simple, and it is only necessary to insert and remove in the vertical axis direction Therefore, workability is improved, sampling is possible without the need for rotational driving, and sampling can be performed without using a large work machine for construction.

また、採取管に上下複数の採取口を設け、サヤ管の引上げにより下位の採取口から順に開放して地盤改良体の形成物を採取管内に取り込むので、地盤改良体の上下間における途中の各位置でその位置の形成物を確実に取り込むことができ、しかも、地盤改良体に対して上下に連続性のあるサンプリングができ、地盤改良体に対して精度の高い品質管理が実現できることになる。   In addition, a plurality of upper and lower sampling ports are provided in the sampling pipe, and the formation of the ground improvement body is taken into the sampling pipe by opening the lower pipe in order by pulling up the sheath pipe, so that each of the midway between the upper and lower sides of the ground improvement body The formation at that position can be reliably taken in at the position, and further, the sampling can be performed continuously up and down with respect to the ground improvement body, and high-quality quality control can be realized for the ground improvement body.

この発明に係るサンプリング装置の分解斜視図The exploded perspective view of the sampling device concerning this invention （ａ）はこの発明に係るサンプリング装置の組立て状態を示す縦断面図、（ｂ）は（ａ）の矢印ｂ−ｂでの拡大した横断平面図、（ｃ）はサンプリング装置の組立て状態を示す先端部分の拡大した縦断面図(A) is a longitudinal sectional view showing the assembled state of the sampling device according to the present invention, (b) is an enlarged cross-sectional plan view taken along arrow bb in (a), and (c) shows the assembled state of the sampling device. Enlarged longitudinal section of the tip この発明に係るサンプリング装置を用いたサンプリング方法の工程を示し、（ａ）はサンプリング装置を地盤改良体内に所定深度まで挿入した状態の縦断面図、（ｂ）はサンプリング装置のサヤ管を引抜く途中の状態を示す縦断面図、（ｃ）は地盤改良体内に採取管を残した状態を示す縦断面図The process of the sampling method using the sampling device which concerns on this invention is shown, (a) is a longitudinal cross-sectional view of the state which inserted the sampling device to the ground improvement body to predetermined depth, (b) pulls out the sheath pipe of a sampling device. A longitudinal sectional view showing a state in the middle, (c) is a longitudinal sectional view showing a state in which a sampling tube is left in the ground improvement body

以下、この発明の実施の形態を添付図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１と図２に示すように、この発明のサンプリング装置１は、所定の長さを有する採取管２と、この採取管２の下部先端に着脱自在となるよう取付けた閉塞栓３と、前記採取管２に対して上下軸方向に移動自在となるよう外嵌するサヤ管４とで構成されている。   As shown in FIGS. 1 and 2, the sampling device 1 of the present invention includes a sampling tube 2 having a predetermined length, a blocking plug 3 attached to the lower end of the sampling tube 2 so as to be detachable, The sheath tube 4 is externally fitted to the sampling tube 2 so as to be movable in the vertical axis direction.

上記採取管２は、サンプリングに必要な長さを有し、例えば、外径約７５ｍｍ程度の鋼管を軸方向に沿って一対の半割り管２ａ、２ａに二つ割にしたものであり、両半割り管２ａ、２ａは、円筒状に組合わせ状態で先端外周面に設けた雄ねじを２ｂを閉塞栓３に螺合し、上端側をベルト等の結束部材２ｃで縛ることで円筒状が保持され、前記両半割り管２ａ、２ａには、上下軸方向に所定の間隔で複数の採取口５が設けられている。   The sampling tube 2 has a length necessary for sampling. For example, a steel tube having an outer diameter of about 75 mm is divided into a pair of half tubes 2a and 2a along the axial direction. The split pipes 2a and 2a are held in a cylindrical shape by connecting a male screw 2b provided on the outer peripheral surface of the tip in a cylindrical shape to the closing plug 3 and binding the upper end with a binding member 2c such as a belt. The half pipes 2a and 2a are provided with a plurality of sampling ports 5 at predetermined intervals in the vertical axis direction.

この採取口５は、例えば、幅２５ｍｍ、上下長さ５０ｍｍ程度の矩形状に形成され、上下長さの２倍以上の間隔で上下に設けられ、前記両半割り管２ａ、２ａにおいて採取口５は上下に交互の配置となるように設けられている。   The sampling port 5 is formed, for example, in a rectangular shape with a width of 25 mm and a vertical length of about 50 mm, and is provided vertically at intervals of at least twice the vertical length. The sampling ports 5 are provided in the half pipes 2a and 2a. Are provided so as to be alternately arranged vertically.

上記閉塞栓３は、内周に採取管２の雄ねじ２ｂをねじ込むための雌ねじ３ｃを設けた金属製の円筒体３ａと、この円筒体３ａの下部に前記雌ねじ３ｃを利用して着脱自在となるよう螺合した先鋭状の金属製先端部材３ｂとで形成され、この閉塞栓３は、サンプリング装置１を地盤改良体内に挿入するときの誘導とウエイトになり、ウエイトは、内部中空となるサンプリング装置１を地盤改良体内に挿入するときに生じる浮力を減少させ、挿入作業を容易にするためのものであり、地盤改良体Ａの性状や挿入深さに合わせた重さの先端部材３ｂを複数種類用意しておくことで選択使用できるようになっている。   The obturator plug 3 is detachable using a metal cylinder 3a provided with an internal thread 3c for screwing the external thread 2b of the sampling tube 2 on the inner periphery, and a lower part of the cylindrical body 3a using the internal thread 3c. The clogged plug 3 is formed with a sharpened metal tip member 3b that is screwed in such a manner that the closing plug 3 serves as a guide and a weight when the sampling device 1 is inserted into the ground improvement body, and the weight is hollow inside. In order to reduce the buoyancy generated when inserting 1 into the ground improvement body and to facilitate the insertion work, there are a plurality of types of tip members 3b having a weight suitable for the properties and insertion depth of the ground improvement body A. You can use it by preparing it.

ちなみに上記閉塞栓３は、図示のような、上部にサヤ管４を採取管２と同軸心状の配置に保持する嵌合筒部を備えた短い先端錐形に限定されるものではなく、上下軸方向に長い軸状の形状や、円筒体３ａの外周にサヤ管４の先端当接面を複数突設したようなものであってもよい。   Incidentally, the closing plug 3 is not limited to a short tip cone shape having a fitting tube portion for holding the sheath tube 4 in a coaxial arrangement with the sampling tube 2 at the upper portion as shown in the figure. An axial shape that is long in the axial direction, or a structure in which a plurality of tip contact surfaces of the sheath tube 4 protrude from the outer periphery of the cylindrical body 3a may be used.

上記サヤ管４は、例えば、内径が８３ｍｍ、外径が８９ｍｍの採取管と同程度の長さを有する、鋼管やステンレス管等の金属管又は塩化ビニルパイプを用い、内径が採取管２に対して適宜隙間を介して外嵌し、外径が閉塞栓３における円筒体３ａの最大外径に略一致するかそれよりも小径になっており、採取管２に対して外嵌することで採取口５の外側を閉鎖し、上方に抜き取って移動させることにより下位の採取口５から順に開放することになる。   The sheath tube 4 is, for example, a metal tube such as a steel tube or stainless steel tube or a vinyl chloride pipe having an inner diameter of 83 mm and an outer diameter of about 89 mm, and the inner diameter of the tube is smaller than that of the sampling tube 2. The outer diameter is appropriately fitted through a gap, and the outer diameter is substantially equal to or smaller than the maximum outer diameter of the cylindrical body 3a in the obturator plug 3. The outer side of the mouth 5 is closed, and the lower sampling mouth 5 is opened in order by extracting and moving upward.

上記したサヤ管４において、これに用いる塩化ビニルパイプは、軸方向の強度に優れ、軽量でコスト的に安価であり、しかも、地盤改良体Ａの形成物であるスラリー状のセメント系固化材に対する剥離性がよく、地盤改良体Ａに対する挿入や引抜が円滑に行えるという利点がある。   In the above-mentioned sheath pipe 4, the vinyl chloride pipe used for this is excellent in the strength in the axial direction, is light in weight and inexpensive in cost, and is in addition to the slurry-like cement-based solidified material that is the formation of the ground improvement body A. The peelability is good, and there is an advantage that the insertion and extraction with respect to the ground improvement body A can be performed smoothly.

また、上記したサヤ管４において、これに用いる鋼管やステンレス管等の金属管は、軸方向の強度に優れているだけでなく、重量があるのでサンプリング装置１におけるウエイトの役目を果たし、スラリー状のセメント系固化材に対するサンプリング装置１の挿入時に、内部中空状態のサヤ管４及び採取管２によって生じる浮力を重量によって減少させ、挿入時の浮力による抵抗を少なくして作業を容易にすると共に、ウエイトを兼ねる閉塞栓３の短尺化や小形化が可能になる。   Further, in the above-described sheath tube 4, the metal tube such as a steel tube or a stainless steel tube used for this is not only excellent in the strength in the axial direction but also has a weight, so that it serves as a weight in the sampling device 1 and is in a slurry state. When the sampling device 1 is inserted into the cement-based solidified material, the buoyancy generated by the inner hollow sheath tube 4 and the sampling tube 2 is reduced by weight, the resistance due to buoyancy during insertion is reduced, and the work is facilitated. The obstruction stopper 3 that also serves as a weight can be shortened or downsized.

この発明のサンプリング装置１は、上記のような構成であり、次に、このサンプリング装置１を用いたサンプリング方法を説明する。   The sampling apparatus 1 according to the present invention has the above-described configuration. Next, a sampling method using the sampling apparatus 1 will be described.

サンプリング装置１は、採取管２の両半割り管２ａ、２ａを円筒状に組合わせ状態で、先端外周面に設けた雄ねじ２ｂに閉塞栓３を螺合し、上端側をベルト等の結束部材２ｃで縛ることで円筒状を保持し、図２に示すように、この採取管２にサヤ管４を外嵌挿入して組立てておく。   The sampling device 1 is configured such that both the half pipes 2a and 2a of the sampling pipe 2 are combined in a cylindrical shape, the closing plug 3 is screwed into a male screw 2b provided on the outer peripheral surface of the tip, and the upper end side is a binding member such as a belt The cylindrical shape is held by binding with 2c, and as shown in FIG.

地中に掘削した縦孔にスラリー状のセメント系固化材を注入することにより、円軸状の地盤改良体（コラム）Ａを構築し、図３(ａ）のように、前記スラリー状のセメント系固化材が流動性のある打設直後に、上記サンプリング装置１を閉塞栓３が下になる垂直の姿勢で地盤改良体Ａ内に所定の深度まで挿入する。   A slurry-like cement-based solidified material is injected into a vertical hole excavated in the ground to construct a circular-shaped ground improvement body (column) A. As shown in FIG. Immediately after placing the solidified material with fluidity, the sampling device 1 is inserted into the ground improvement body A in a vertical posture with the closing plug 3 down to a predetermined depth.

このとき、採取管２に外嵌したサヤ管４は、採取管２の外側を覆うことで採取口５を外側から閉じ、サヤ管４の下部先端が閉塞栓３に当接することにより閉鎖されるので、挿入時に、サヤ管４及び採取管２内へのセメント系固化材の流入発生はなく、また、閉塞栓３の重量及びサヤ管４に金属管を用いた場合の重量がウエイトになり、挿入時にサヤ管４及び採取管２の内部中空によって浮力が発生するが、この浮力は前記したウエイトで減少させることができ、従って、サンプリング装置１を地盤改良体Ａ内の深い位置にまで円滑に挿入することができる。   At this time, the sheath tube 4 fitted on the collection tube 2 is closed by covering the outside of the collection tube 2 to close the collection port 5 from the outside, and the lower end of the sheath tube 4 abuts against the blocking plug 3. Therefore, at the time of insertion, the cement-based solidified material does not flow into the sheath tube 4 and the sampling tube 2, and the weight of the plug plug 3 and the weight when the metal tube is used for the sheath tube 4 are weights. Buoyancy is generated by the hollow inside of the sheath tube 4 and the sampling tube 2 at the time of insertion. This buoyancy can be reduced by the above-described weight, and therefore the sampling device 1 can be smoothly moved to a deep position in the ground improvement body A. Can be inserted.

上記のように、サンプリング装置１を地盤改良体Ａ内に挿入した状態で、地盤改良体Ａの形成物であるスラリー状のセメント系固化材が流動性のあるうちに、採取管２を残したままサヤ管４だけを上方に引抜いて行くと、図３（ｂ）のように、サヤ管４の下端が上昇していくことで、下位の採取口５から順に開放され、開放した採取口５から採取管２の内部に地盤改良体Ａであるスラリー状のセメント系固化材が流入し、採取口５が位置する深さ部分にある付近のスラリー状のセメント系固化材を採取管２内に取り込み、採取管２内を埋めることになる。   As described above, while the sampling device 1 is inserted into the ground improvement body A, the sampling tube 2 remains while the slurry-like cementitized solidified material that is the formation of the ground improvement body A is fluid. If only the Saya tube 4 is pulled out as it is, the lower end of the Saya tube 4 rises as shown in FIG. The slurry-like cement-based solidified material that is the ground improvement body A flows into the sampling tube 2 from the inside, and the nearby slurry-shaped cement-based solidified material in the depth portion where the sampling port 5 is located is placed in the sampling tube 2. The inside of the collection tube 2 is taken up and filled.

このように、サヤ管４を引上げていくと、下位の採取口５から順にその採取口５が位置する深さ部分にある付近のスラリー状のセメント系固化材を採取管２内に取り込むことができ、図３（ｃ）のように、サヤ管４を完全に引抜けば、地盤改良体Ａの上下全長における各深さ位置での採取が可能になり、連続性のある採取が行える。   Thus, when the Saya tube 4 is pulled up, the slurry-like cement-based solidified material in the vicinity of the depth where the sampling port 5 is located can be taken into the sampling tube 2 in order from the lower sampling port 5. If the sheath pipe 4 is completely pulled out as shown in FIG. 3 (c), sampling at each depth position in the entire vertical length of the ground improvement body A becomes possible, and continuous sampling can be performed.

上記のように、サヤ管４を抜き取った後、適宜時間の経過によって地盤改良体Ａであるスラリー状のセメント系固化材がある程度固結すると、地盤改良体Ａから採取管２を引抜いて地上に取出し、その後、スラリー状のセメント系固化材が固結する時間を待って採取管２を分解する。   As described above, when the slurry-like cement-based solidified material that is the ground improvement body A is solidified to some extent as time elapses after the sheath pipe 4 is pulled out, the sampling tube 2 is pulled out from the ground improvement body A to the ground. Thereafter, the sampling tube 2 is disassembled after waiting for a time for the cementitious solidified slurry to solidify.

採取管２の分解は、半割り管２ａ、２ａの先端から閉塞栓３を取外し、半割り管２ａ、２ａを開くようにすればよく、固結したスラリー状のセメント系固化材により、連続性のある試料コアを採取することがき、取出したこの試料コアを用いて一軸圧縮等の予め決められた各種試験を行うことにより、地盤改良体の性状を確認することができる。   The sampling tube 2 can be disassembled by removing the blocking plug 3 from the tip of the half pipes 2a, 2a and opening the half pipes 2a, 2a. It is possible to collect a certain sample core, and the properties of the ground improvement body can be confirmed by performing various predetermined tests such as uniaxial compression using the sample core taken out.

上記したこの発明のサンプリング装置１によると、試料コアを地盤改良体Ａの各深度部分で正確に採取することができ、連続性の確認が行えると共に、サンプリング装置１は、地盤改良体Ａに対して上下軸方向に抜き差しするだけでよいので、小型の作業機械を用いて試料コアを採取できるという経済的な利点がある。   According to the sampling device 1 of the present invention described above, the sample core can be accurately sampled at each depth portion of the ground improvement body A, continuity can be confirmed, and the sampling device 1 can be used for the ground improvement body A. Therefore, there is an economic advantage that the sample core can be collected using a small work machine.

１ サンプリング装置
２ 採取管
３ 閉塞栓
４ サヤ管
５ 採取口
Ａ 地盤改良体 1 Sampling device 2 Sampling tube 3 Blocking plug 4 Saya tube 5 Sampling port A Ground improvement body

Claims (3)

先端に閉塞栓を着脱自在に取付けた採取管に複数の採取口を軸方向に点在して設け、前記採取管を軸方向に沿って複数に分割可能な構造とし、この採取管に対してサヤ管を軸方向に抜き差し自在となるよう外嵌した地盤改良体のサンプリング装置。   A plurality of sampling ports are provided in an axial direction in a sampling tube in which a blocking plug is detachably attached to the tip, and the sampling tube has a structure that can be divided into a plurality along the axial direction. Sampling device for ground improvement body with external fitting so that the Saya tube can be inserted and removed in the axial direction. 上記採取管が鋼管を用いて形成され、上記サヤ管が金属管又は塩化ビニルパイプの何れかで形成されている請求項１に記載の地盤改良体のサンプリング装置。   2. The ground improvement body sampling apparatus according to claim 1, wherein the sampling pipe is formed using a steel pipe, and the sheath pipe is formed of either a metal pipe or a vinyl chloride pipe. 請求項１又は２に記載のサンプリング装置を用い、先端に閉塞栓を取付けた採取管に対してサヤ管を外嵌した状態のサンプリング装置を、地盤改良体がその形成物に流動性がある状態でこの地盤改良体に対して所定の深度まで挿入し、所定の深度に到達したらサヤ管だけを引抜くことで採取管を残し、サヤ管の引上げにより下位の採取口から順に開放していき、開放された各採取口の部分で地盤改良体の形成物を採取管内に取り込み、その後、地盤改良体から採取管を引抜く地盤改良体のサンプリング方法。   Using the sampling device according to claim 1 or 2, a sampling device in a state in which a sheath tube is externally fitted to a sampling tube having a blocking plug attached to the tip, the ground improvement body has a fluidity in its formed product With this ground improvement body inserted to a predetermined depth, when the predetermined depth is reached, the sampling tube is left by pulling out only the Saya tube, and the Saya tube is lifted in order from the lower sampling port, A method for sampling a ground improvement body in which a formation of a ground improvement body is taken into a sampling pipe at each open sampling port, and then the sampling pipe is pulled out from the ground improvement body.
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