本発明は、軟弱な地盤の強度や変形特性を調べるときに
使用する孔内載置試験用プローブに関するものである。The present invention relates to an in-hole test probe used to investigate the strength and deformation characteristics of soft ground.
一般にプローブを地盤中に設置するには、掘削されたポ
ーリング孔内にプローブを挿入するが、軟弱な地盤では
掘削したあとからポーリング孔が崩壊するため、セルフ
ポーリング機構を有するプローブを用いて地盤を掘削し
ながら挿入するか、又はプローブを直接軟弱な地盤に圧
入して行う。その際、可撓性チューブは地盤に接しつつ
挿入されるためずれ上がりや捲れ上がりを生じ、この状
態で試験を行なっても正常な試験結果は得られないこと
になる。特公平１−５７２９４号公報には、可撓性チューブの捲
れ上がり防止を達成するため、該可撓性チューブの外側
に、円筒母線方向に沿った多数のスリットを付けた金属
円筒製のシースを被せ、そのシースの上下端内側に円筒
形測定管の上下鍔が係止し得るようになすと共に、両者
の上下端の間に可動間隔を設ける構成が開示されている
。Generally, to install a probe into the ground, the probe is inserted into a polling hole that has been excavated.However, in soft ground, the polling hole collapses after being excavated, so a probe with a self-polling mechanism is used to insert the probe into the ground. This can be done by inserting the probe while excavating, or by press-fitting the probe directly into the soft ground. At this time, since the flexible tube is inserted while being in contact with the ground, it may slip up or curl up, and even if the test is performed in this state, normal test results will not be obtained. Japanese Patent Publication No. 1-57294 discloses that in order to prevent the flexible tube from curling up, a metal cylindrical sheath is provided on the outside of the flexible tube with numerous slits along the cylindrical generatrix direction. A configuration is disclosed in which the upper and lower flanges of a cylindrical measuring tube can be locked inside the upper and lower ends of the sheath, and a movable interval is provided between the upper and lower ends.
軟弱な地盤の試験に用いられる可撓性チューブにあって
は薄くて軟らかい生ゴム製等とし、可及的可撓性チュー
ブの膨脹反力を小さくすることに特別の配慮が払われて
いる。ところが可撓性チューブの外側に、上記した金属
製のシースを被せて該チューブの捲れ上がり防止を図っ
た場合には、該シースのストリップの剛性が大きいため
に反力が大きくなってしまい、測定精度を悪くした。ま
た、取扱い上も比較的面倒てあった。本発明の目的は、かかる欠点を解消することにある。The flexible tubes used for testing soft ground are made of thin, soft raw rubber, etc., and special consideration is given to minimizing the expansion reaction force of the flexible tubes as much as possible. However, when the above-mentioned metal sheath is placed over the outside of a flexible tube to prevent the tube from curling up, the rigidity of the sheath strip is large, resulting in a large reaction force, which makes it difficult to measure. Reduced accuracy. It was also relatively troublesome to handle. The object of the present invention is to eliminate such drawbacks.
本発明は、剛な材料からなる筒体の外側に可撓性チュー
ブを被せ、該可撓性チューブを注入加圧液体によって膨
脹させるようにしたプローブにおいて、可撓性チューブ
の外側に、長手方向に伸びにくく、円周方向に伸び易い
筒状保護部材を配設することによって、上記の目的を達
成したものである。筒状保護部材は合成樹脂製の網状成形製品のほか、縦糸
にポリウレタン高弾性糸を使い、横糸には普通糸を使っ
た細デニールの丸編製品が使用できる。上記筒状保護部材の上下端は、可撓性チュブの上下端と
一緒に固定してもよいし、筒体に設けた０リングにより
一定の摺動抵抗か付与され且つ可撓性チューブの固定部
とは間隔りをおいて配設される取付リングに取付けても
よい。The present invention provides a probe in which a flexible tube is placed on the outside of a cylindrical body made of a rigid material, and the flexible tube is inflated by injected pressurized liquid. The above object has been achieved by providing a cylindrical protection member that is difficult to stretch in the circumferential direction and easy to stretch in the circumferential direction. For the cylindrical protective member, in addition to net-shaped molded products made of synthetic resin, a fine denier circular knitted product using high elastic polyurethane yarn for the warp and normal yarn for the weft can be used. The upper and lower ends of the cylindrical protective member may be fixed together with the upper and lower ends of the flexible tube, or a certain sliding resistance is provided by an O-ring provided on the cylindrical body, and the flexible tube is fixed. It may be attached to a mounting ring spaced apart from the section.
長手方向に伸びにくい材料からなる筒状保護部材が可撓
性チューブの外側に配設されることで、プローブを地盤
に接しつつ挿入するとき生じがちな可撓性チューブのず
れ上がりや捲れ上がりを防ぐ。注入加圧液体て可撓性チ
ューブが膨脹するときには、筒状保護部材は円周方向に
は伸び易いものであるから、反力を小さくできる。合成樹脂製の網状成形製品の筒状保護部材は網状形状に
よって、また、縦糸にポリウレタン高弾性糸を使い、横
糸には普通糸を使った細デニールの丸編製品の筒状保護
部材では使用材料の性質によって、それぞれ、長手方向
に伸びにくく、円周方向に伸び易いものとする。可撓性チューブの膨脂時の縦伸率は約２％程度であるか
ら、筒状保護部材の上下端を可撓性チューブの上下端と
一緒に固定しても、これによる膨脹反力の増大は格別問
題とならない。筒体に設けたＯリングにより一定の摺動抵抗が付与され
且つ可撓性チューブの固定部とは間隔りをおいて配設さ
れる取付リングに筒状保護部材の上下端を取付けるとき
には、取付リングをた易くは動かなくするから、プロー
ブを地盤に接しつつ挿入するときに、筒状保護部材によ
って可撓性チューブの捲れ上がりを確実に防止する。一
方、注入加圧液体で可撓性チューブが膨脹して筒状保護
部材に加わる力が大きくなり、０リングによる一定の摺
動抵抗以上となるときには、取付リングは間隔りを狭め
るように移動して、可撓性チューブの膨脹反力を大きく
しない。A cylindrical protective member made of a material that does not stretch in the longitudinal direction is placed on the outside of the flexible tube to prevent the flexible tube from slipping or curling up, which tends to occur when inserting the probe while touching the ground. prevent. When the flexible tube is expanded by the injected pressurized liquid, the cylindrical protection member can easily expand in the circumferential direction, so that the reaction force can be reduced. The cylindrical protective member of synthetic resin net-shaped molded products depends on the net shape, and the material used for the cylindrical protective member of fine denier circular knitted products, which uses polyurethane high elasticity yarn for the warp and normal yarn for the weft, differs depending on the net shape. Depending on their properties, they are difficult to stretch in the longitudinal direction and easy to stretch in the circumferential direction. Since the vertical elongation rate of a flexible tube when expanded is about 2%, even if the upper and lower ends of the cylindrical protection member are fixed together with the upper and lower ends of the flexible tube, the expansion reaction force caused by this will be reduced. Increase is not a particular problem. When attaching the upper and lower ends of the cylindrical protective member to a mounting ring that provides a certain sliding resistance with an O-ring provided on the cylindrical body and is spaced apart from the fixed part of the flexible tube, it is necessary to Since the ring does not move easily, the cylindrical protection member reliably prevents the flexible tube from curling up when the probe is inserted in contact with the ground. On the other hand, when the flexible tube expands with the injected pressurized liquid and the force applied to the cylindrical protection member increases and exceeds a certain sliding resistance due to the O-ring, the mounting rings move to narrow the gap. Do not increase the expansion reaction force of the flexible tube.
本発明の一実施例である第１図の例は、公知のセルフポ
ーリングプレッシャーメーターのプローブの場合であっ
て、金属製の筒体］は、外部と連通ずる圧力水のチャン
バー２を形成するために二重となった筒体内側部分１ａ
と筒体外側部分１ｂを有し、その筒体外側部分１ｂの外
側に可撓性チューブ３が配設されていて、筒体外側部分
１ｂに穿設した複数の貫通孔４を経てチャンバー２内の
圧力水が注入されると可撓性チューブ３は外側に膨脹さ
れるようになっている。また、筒体１の下端部には回転
可能な掘削羽根５があり、その掘削羽根５により掘削さ
れた土砂は筒体１内側を通って上方の吐出口（図示せず
）から排出されるようになっている。以上は従来のプローブと変わりＣ＾いが、可撓性チュー
ブ３の外側を、長手方向に伸びにくく、円周方向に伸び
易い筒状保護部材６で保護している点で相違している。長手方向に伸びにくく、円周方向に伸び易いという性質
は、第１図に示した合成樹脂製の網状成形製品である筒
状保護部材６では、網形状によって付与している。この
他、図示するを省略したが、縦糸にポリウレタン高弾性
糸等を使い、横糸には普通糸等を使った細デニールの丸
編製品では使用材料の性質によって付与することができ
る。前者は容易に入手でき且つ安価である利点があるが
、可撓性チューブ３か硬い固形物の鋭利な角と接触した
ときの全面保護機能の点てはやや劣る。後者は逆にやや高価につくけれども、全面保護機能の点
ではすぐれている。筒状保護部材６の上下端は、第２図に示すように、可撓
性チューブ３の上下端と共に固定することができる。す
なわち、筒体１の外面に形成した傾斜面個所１ｃと適合
する傾斜面を形成した押リング７を筒体１に嵌め、筒体
１の外面に形成したネジに螺合する締付ナツト８によっ
て押リング７に押付力を加えられるようにすると、可撓
性チューブ３および筒状保護部材６の端部を筒体１の傾
斜面個所ＩＣと押リング７の傾斜面の間で挟持できる。可撓性チューブ３の理想的な膨脹は、上下両端ではそれ
ぞれ断面が１／４円となるように膨らみ、その中間は均
等に膨らむことである。そのときの続伸量を、可撓性チ
ューブ３の標準的な大きさである装着時の直径約ＩＣ１
１１膨脹時の直径路３ｃｍ、長さ約６０ＣＩ１１として
計算してみると約１ 、１４ｃ＋ｎとなる。これは長さ
に対して約２％に相当し、この程度であるならば、筒状
保護部材６の上下端を完全に固定しても、それによる膨
脹反力増大は問題視される程ではないことが理解できる
。第３図の例では、筒体ｌに設けたＯリング９により一定
の摺動抵抗が付与せしめられ、且つ可撓性チューブ３の
固定部とは間隔りをおいて配設される取付リングＩＯが
筒体１に嵌められていて、その取付リング１０の外面に
形成したネジに螺合する締付ナツト１２て押付力を加え
られる押リング１３が取付リングｌＯに嵌まっている。上記のようにＯリング９により一定の摺動抵抗を付与せ
しめられた取付リング１０と押リング１３の間て筒状保
護部材６の端部を挟持しておくと、プローブを地盤に接
しつつ挿入するとき、取付リング１０はた易くは動かな
いから、筒状保護部材６によって確実に可撓性チューブ
３の捲れ上がりを防止する。一方、注入加圧液体て可撓
性チューブ３が膨脹することに伴い、筒状保護部材６に
加わる力が０リング９による一定の摺動抵抗以上となる
ときには間隔りを狭めるように移動するから、反力を大
きくならないようにする。The example shown in FIG. 1, which is an embodiment of the present invention, is a case of a probe of a known self-polling pressure meter, in which a metal cylinder is used to form a pressure water chamber 2 that communicates with the outside. The inner part 1a of the cylindrical body is doubled.
and a cylindrical outer part 1b, and a flexible tube 3 is disposed outside the cylindrical outer part 1b, and the inside of the chamber 2 is passed through a plurality of through holes 4 bored in the cylindrical outer part 1b. When pressurized water is injected, the flexible tube 3 is expanded outward. Further, there is a rotatable excavation blade 5 at the lower end of the cylindrical body 1, and the earth and sand excavated by the excavation blade 5 passes through the inside of the cylindrical body 1 and is discharged from an upper discharge port (not shown). It has become. The above is different from the conventional probe in that the outside of the flexible tube 3 is protected by a cylindrical protection member 6 that is difficult to stretch in the longitudinal direction but easy to stretch in the circumferential direction. The properties of being difficult to stretch in the longitudinal direction and easy to stretch in the circumferential direction are imparted to the cylindrical protection member 6, which is a net-shaped molded product made of synthetic resin, shown in FIG. 1 by the net shape. In addition, although not shown in the drawings, it can be applied depending on the properties of the materials used in a fine denier circular knit product using polyurethane high elasticity yarn for the warp and ordinary yarn for the weft. The former has the advantage of being easily available and inexpensive, but is somewhat inferior in its ability to protect the entire surface when the flexible tube 3 comes into contact with a sharp corner of a hard solid object. The latter, on the other hand, is a little more expensive, but it offers superior overall protection. The upper and lower ends of the cylindrical protection member 6 can be fixed together with the upper and lower ends of the flexible tube 3, as shown in FIG. That is, a push ring 7 having an inclined surface that matches the inclined surface portion 1c formed on the outer surface of the cylinder 1 is fitted into the cylinder 1, and a tightening nut 8 is screwed into a screw formed on the outer surface of the cylinder 1. When a pressing force can be applied to the push ring 7, the ends of the flexible tube 3 and the cylindrical protection member 6 can be held between the inclined surface portion IC of the cylinder body 1 and the inclined surface of the push ring 7. The ideal expansion of the flexible tube 3 is for the upper and lower ends to swell so that the cross section becomes 1/4 circle, and for the middle to swell evenly. The amount of subsequent elongation at that time is approximately IC1, which is the standard size of the flexible tube 3 when installed.
11 When the diameter path when inflated is 3 cm and the length is about 60 CI11, it is calculated to be about 1.14c+n. This corresponds to about 2% of the length, and if it is at this level, even if the upper and lower ends of the cylindrical protection member 6 are completely fixed, the increase in the expansion reaction force will not be considered a problem. I can understand that there isn't. In the example shown in FIG. 3, a certain sliding resistance is provided by an O-ring 9 provided on the cylindrical body l, and an attachment ring IO is arranged at a distance from the fixed part of the flexible tube 3. is fitted into the cylindrical body 1, and a push ring 13 to which a pressing force is applied by a tightening nut 12 screwed into a screw formed on the outer surface of the mounting ring 10 is fitted into the mounting ring IO. If the end of the cylindrical protection member 6 is held between the mounting ring 10 and the push ring 13, which are provided with a certain sliding resistance by the O-ring 9 as described above, the probe can be inserted while being in contact with the ground. At this time, since the attachment ring 10 does not move easily, the cylindrical protection member 6 reliably prevents the flexible tube 3 from curling up. On the other hand, when the force applied to the cylindrical protection member 6 exceeds a certain sliding resistance due to the O-ring 9 as the flexible tube 3 expands with the injected pressurized liquid, it moves to narrow the gap. , prevent the reaction force from increasing.
【１発明の効果】以上説明したように、本発明では、可撓性チューブの外
側に、長手方向に伸びにくく、円周方向に伸び易い筒状
保護部材を配設するという比較的簡単な構成で、軟弱な
地盤の試験には是非とも必要な可撓性チューブ膨脂時の
反力を可及的小ならしめることができる点で甚だ優れて
いる。長手方向に伸びにくく、円周方向に伸び易い筒状保護部
材は、入手し易い合成樹脂製の網状成形製品や、縦糸に
ポリウレタン高弾性糸を使い、横糸には普通糸を使った
細デニールの丸編製品といったものでよい点も便利であ
る。筒状保護部材の上下端を可撓性チューブの上下端と一緒
に固定すると、至極簡単な構造で済むことになる。また
、筒体に設けた０リングにより一定の摺動抵抗が付与さ
れ且っ可撓性チュ−ブの固定部とは間隔りをおいて配設
される取付リングに取付けるときには、プローブ挿入の
際の可撓性チューブの捲れ上がり防止を行うことは勿論
、可撓性チューブ膨脂の際の反力を大きくならないよう
にすることができる。[1] Effects of the Invention As explained above, the present invention has a relatively simple structure in which a cylindrical protection member that is difficult to stretch in the longitudinal direction but easy to stretch in the circumferential direction is provided on the outside of the flexible tube. It is extremely superior in that it can minimize the reaction force when the flexible tube is expanded, which is absolutely necessary for testing soft ground. The cylindrical protective member, which is difficult to stretch in the longitudinal direction but easy to stretch in the circumferential direction, can be made of easily available net-shaped molded synthetic resin products or fine-denier products that use polyurethane high elasticity yarn for the warp and ordinary yarn for the weft. It is also convenient that it can be used as a circular knitted product. If the upper and lower ends of the cylindrical protection member are fixed together with the upper and lower ends of the flexible tube, an extremely simple structure can be achieved. In addition, when the probe is attached to a mounting ring that provides a certain sliding resistance due to the O-ring provided on the cylindrical body and is spaced apart from the fixed part of the flexible tube, it is necessary to This not only prevents the flexible tube from curling up, but also prevents the reaction force from increasing when the flexible tube swells.
第１図は、本発明の１実施例である孔内載置試験用プロ
ーブを一部破断して内部構造を示した側面図、第２図は
その要部の断面図、第３図は第２図とは異なる実施例の
要部の断面図である。１・・・筒体、２・・・圧力水のチャンバー ３・・・
可撓性チューブ、４・・・貫通孔、５・・・掘削羽根、
６・・・筒状保護部材、７．１３・・・押リング、８．
１２・・・締付ナツト、９・・・０リング、ｌＯ・・・
取付リング。Fig. 1 is a partially cutaway side view showing the internal structure of an in-hole test probe according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of its main parts, and Fig. FIG. 2 is a sectional view of a main part of an embodiment different from FIG. 2; 1... Cylindrical body, 2... Pressure water chamber 3...
Flexible tube, 4... Through hole, 5... Drilling blade,
6... Cylindrical protection member, 7.13... Push ring, 8.
12...Tightening nut, 9...0 ring, lO...
mounting ring.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7289490AJPH03271418A (en) | 1990-03-22 | 1990-03-22 | In-hole loading test probe |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7289490AJPH03271418A (en) | 1990-03-22 | 1990-03-22 | In-hole loading test probe |
| Publication Number | Publication Date |
|---|---|
| JPH03271418Atrue JPH03271418A (en) | 1991-12-03 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7289490APendingJPH03271418A (en) | 1990-03-22 | 1990-03-22 | In-hole loading test probe |
| Country | Link |
|---|---|
| JP (1) | JPH03271418A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7500389B2 (en)* | 2005-10-14 | 2009-03-10 | Weatherford/Lamb, Inc. | Tubing expansion |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7500389B2 (en)* | 2005-10-14 | 2009-03-10 | Weatherford/Lamb, Inc. | Tubing expansion |
| US7634942B2 (en) | 2005-10-14 | 2009-12-22 | Weatherford/Lamb, Inc. | Tubing expansion |
| US7913555B2 (en) | 2005-10-14 | 2011-03-29 | Weatherford/Lamb, Inc. | Tubing expansion |
| US8549906B2 (en) | 2005-10-14 | 2013-10-08 | Weatherford/Lamb, Inc. | Tubing expansion |
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