JPH0621446B2 - Ground survey method - Google Patents
Ground survey methodInfo
- Publication number
- JPH0621446B2 JPH0621446B2 JP61302370A JP30237086A JPH0621446B2 JP H0621446 B2 JPH0621446 B2 JP H0621446B2 JP 61302370 A JP61302370 A JP 61302370A JP 30237086 A JP30237086 A JP 30237086A JP H0621446 B2 JPH0621446 B2 JP H0621446B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- penetration test
- frictional force
- test
- pull
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、試験片を地盤内に貫入させての貫入試験を行
って前記地盤の性状を調査する地盤調査方法に関する。TECHNICAL FIELD The present invention relates to a ground investigation method for investigating properties of the ground by performing a penetration test in which a test piece penetrates into the ground.
上述した地盤調査方法の貫入試験としては、サンプラー
と呼ばれる試験片をハンマーの自由落下による打撃で地
盤内に打込み、このサンプラーを30cm貫入させるのに要
する打撃回数を、土の硬軟や締り具合の相対値であるＮ
値とする標準貫入試験が広く知られている。As a penetration test of the above-mentioned ground survey method, a test piece called a sampler is driven into the ground by a free fall of a hammer, and the number of hits required for penetrating this sampler by 30 cm is the relative hardness and softness of soil. The value N
The standard penetration test for value is widely known.
この標準貫入試験によって得られたＮ値から、上記のよ
うな各種の土の性状を推定することができ、それに基づ
いて、建築物等における杭基礎の設計が行われている。From the N value obtained by this standard penetration test, it is possible to estimate the properties of various types of soil as described above, and on the basis of this, the design of pile foundations in buildings and the like is performed.
ところで、杭基礎には、建築物の自重等の鉛直荷重の
他、地震時等においては、引抜き荷重が作用する。した
がって、杭の設計には引抜き荷重も考慮する必要があ
る。そして、それには、杭の自重とともに引抜き耐力と
なる杭の周面摩擦力を知ることが必要である。By the way, in addition to a vertical load such as the self-weight of a building, a pulling load acts on the pile foundation during an earthquake or the like. Therefore, it is necessary to consider the pull-out load when designing the pile. In order to do so, it is necessary to know the peripheral frictional force of the pile, which is the pull-out strength together with the weight of the pile.
前記の周面摩擦力を得るに従来では、次の手段が採用さ
れていた。Conventionally, the following means have been adopted to obtain the above-mentioned peripheral frictional force.
その一つは、貫入試験として標準貫入試験を行い、その
標準貫入試験により得たＮ値と設計式とを用いて周面摩
擦力を算出して求める手段である。One of them is a means for performing a standard penetration test as a penetration test, and calculating and obtaining the circumferential surface frictional force using the N value obtained by the standard penetration test and the design formula.
他の一つは、静的貫入試験の一環として行う方法で、特
公昭４６-１４９８号公報に見られるように、地盤に貫
入させる試験片として、貫入抵抗を検出するための検出
部と貫入時にかかる周面摩擦力を検出するための検出部
とを備えた測定コーンを用い、試験片を静的貫入させて
その静的貫入時にかかる周面摩擦力を測定することによ
り得る手段である。The other is a method to be carried out as a part of the static penetration test, as shown in Japanese Examined Patent Publication No. 46-1498, as a test piece for penetration into the ground, as a detection part for detecting penetration resistance and at the time of penetration. It is a means for obtaining the test piece by statically penetrating the test piece and measuring the peripheral frictional force at the time of the static penetration, using a measuring cone provided with a detecting section for detecting the peripheral frictional force.
しかし、上述した従来の技術のうち、前者の標準貫入試
験により求めたＮ値と設計式とを用いて周面摩擦力を得
る手段によるときは、Ｎ値には先端支持力の要素も含ま
れていことに起因して、この設計式から求められる周面
摩擦力が安全側になるように設定されているから、得ら
れる周面摩擦力が不必要に大きな安全率を見込んだ小さ
な値となる。However, among the conventional techniques described above, when the means for obtaining the peripheral frictional force using the N value obtained by the former standard penetration test and the design formula is used, the N value also includes the element of the tip supporting force. Due to the fact that the peripheral friction force calculated from this design formula is set to be on the safe side, the peripheral friction force obtained will be a small value that allows for an unnecessarily large safety factor. .
従って、この前者手段により得た周面摩擦力を用いて設
計した場合には、地震時等における引抜き荷重に対して
専ら杭の自重で抵抗することになって、杭として大型
の、時として不必要に大規模なものが用いられる虞れが
あった。つまり、周面摩擦力が大きい方であるとか小さ
い方であるとかいった杭基礎の設計の参考となる程度の
周面摩擦力が得られるに止まり、性能過剰が少ない合理
的な杭基礎の設計に十分に役立つ実用的な精度の周面摩
擦力を得ることが困難であった。Therefore, when designing using the peripheral frictional force obtained by this former means, the pulling load at the time of an earthquake will be exclusively resisted by the own weight of the pile, and the pile will be large and sometimes unusable. There was a fear that a large scale one would be used as needed. In other words, the ratio of the peripheral frictional force to the reference of the design of the pile foundation, such as the one with a large peripheral frictional force or the one with a small peripheral frictional force, is obtained, and the rational pile foundation design with little excess performance is obtained. It has been difficult to obtain a practically accurate peripheral frictional force that is sufficiently useful for
他方、後者の手段によるときには、周面摩擦力を測定に
より得るから、実用的な精度の周面摩擦力を得やすいも
のの、測定コーンの静的貫入時の周面摩擦力を測定する
から、次のような欠点があった。On the other hand, when the latter means is used, the peripheral friction force is obtained by measurement, so it is easy to obtain the peripheral friction force of practical accuracy, but the peripheral friction force during static penetration of the measuring cone is measured. There was such a drawback.
地盤の硬さの変化によって測定コーンにかかる貫入抵抗
が変化するから、たとえ測定コーンを貫入させる貫入装
置として機械的精度の高いものを用いても、この貫入抵
抗の変化の影響を受けて測定コーンの貫入速度が変化
し、その結果、周面摩擦力を精度良く測定することが困
難であった。つまり、精度の高い周面摩擦力を得ること
が困難で信頼性が低いものであった。しかも、測定コー
ンの静的貫入は、砂質土でＮ値が２０、粘性土でＮ値が
１０程度よりも大きな値を示す地盤では不可能と考えら
れるから、地盤のうち前記の値よりもＮ値が小さい地盤
でしか周面摩擦力を測定することができず、一般的な標
準貫入試験を実施することができる範囲にＮ値が収まっ
ている地盤の全部を調査することができなかった。Since the penetration resistance applied to the measuring cone changes due to the change in the hardness of the ground, even if a highly precise penetrating device for penetrating the measuring cone is used, the measuring cone is affected by the change in the penetrating resistance. It was difficult to measure the frictional force on the peripheral surface with high accuracy. That is, it is difficult to obtain a highly accurate frictional force on the peripheral surface and the reliability is low. Moreover, it is considered that static penetration of the measurement cone is not possible on the ground where the N value is 20 in sandy soil and the N value is larger than approximately 10 in cohesive soil. The peripheral frictional force could be measured only on the ground with a small N value, and it was not possible to investigate all of the ground with an N value within the range where a general standard penetration test could be carried out. .
本発明の目的は、精度の高い杭の周面摩擦力を簡単に得
ることができ、しかも、標準貫入試験を行える地盤であ
れば、実施することができる地盤調査方法を提供する点
にある。An object of the present invention is to provide a ground survey method which can easily obtain a highly accurate peripheral frictional force of a pile and can be carried out if the ground can carry out a standard penetration test.
本発明による地盤調査方法の特徴は、前記貫入試験とし
て、試験片を地盤内に所定量貫入するまで打ち込んでＮ
値を測定する標準貫入試験を行い、その標準貫入試験に
おける打ち込み後の試験片の地盤からの引き抜き時にそ
の引抜き抵抗力を測定する点にある。The feature of the ground investigation method according to the present invention is that, as the penetration test, N is obtained by driving a test piece into the ground until a predetermined amount of penetration is achieved.
The point is to perform a standard penetration test to measure the value and measure the pull-out resistance when the test piece after driving in the standard penetration test is pulled out from the ground.
つまり、標準貫入試験などの貫入試験を行うにあたって
は、試験片を地盤内から引き抜く過程が必ず存在する。
しかも、試験片を引き抜きく場合は、試験片を貫入させ
る場合に比較して、地盤の硬さの変化によって変化する
貫入抵抗がない分、試験片の移動速度を定速に維持し易
い。That is, in performing a penetration test such as a standard penetration test, there is always a process of pulling out the test piece from the ground.
In addition, when the test piece is pulled out, the moving speed of the test piece can be easily maintained at a constant speed, as compared with the case where the test piece is penetrated, because there is no penetration resistance that changes due to changes in the hardness of the ground.
上記の点に着目して、貫入試験を行った後の試験片の引
抜き過程において、周面摩擦力と相関関係がある引抜き
抵抗力を測定するから、地盤の硬さ変化にかかわらず、
試験片の引抜き速度を定速に維持し易くて、引抜き抵抗
力を精度良く検出することができ、その結果、引抜き抵
抗力と周面摩擦力との相関関係を基にして引抜き抵抗力
から得られる周面摩擦力を精度の高いものにできる。Focusing on the above points, in the pulling out process of the test piece after the penetration test, since the pulling resistance force that correlates with the peripheral friction force is measured, regardless of the hardness change of the ground,
The pull-out speed of the test piece can be easily maintained at a constant speed, and the pull-out resistance force can be accurately detected.As a result, the pull-out resistance force can be obtained from the pull-out resistance force based on the correlation between the pull-out resistance force and the peripheral friction force. The peripheral frictional force generated can be made highly accurate.
しかも、引抜き抵抗力の測定を行う事前作業としての貫
入試験として、静的貫入試験よりもＮ値が大きい地盤を
調査対象にすることができる動的貫入試験の一つである
標準貫入試験を行うから、標準貫入試験を行えるＮ値の
地盤であれば引抜き抵抗力を測定することができて、静
的貫入試験で周面摩擦力を得ていた従来よりもＮ値が大
きい地盤の周面摩擦力を得ることができるのみならず、
標準貫入試験を行える地盤であればその地盤で杭の周面
摩擦力を得ることができる。Moreover, as a penetration test as a preparatory work for measuring the pull-out resistance, a standard penetration test, which is one of the dynamic penetration tests that can target the ground with a larger N value than the static penetration test, is performed. Therefore, it is possible to measure the pull-out resistance force if the ground has an N value that can perform a standard penetration test, and the peripheral surface friction of the ground with a larger N value than before, which was obtained in the static penetration test, was obtained. Not only can you gain power,
If the ground is capable of performing a standard penetration test, the peripheral frictional force of the pile can be obtained on that ground.
その上、引抜き抵抗力から求めた周面摩擦力に加え、標
準貫入試験によるＮ値と設計式とを用いて求める周面摩
擦力も得ることができるので、それら両種周面摩擦力を
比較することにより、引抜き抵抗力から求めた周面摩擦
力が妥当なものであるか否かを判断でき、得られる周面
摩擦力の信頼性を向上することができる。Furthermore, in addition to the peripheral frictional force obtained from the pull-out resistance, the peripheral frictional force obtained by using the N value by the standard penetration test and the design formula can also be obtained. Therefore, both types of peripheral frictional force are compared. This makes it possible to determine whether or not the peripheral frictional force obtained from the pull-out resistance is appropriate, and the reliability of the peripheral frictional force obtained can be improved.
更に、引抜き抵抗力の測定を、標準貫入試験における試
験片の引抜き時に行うから、標準貫入試験を行うための
標準貫入試験機にロードセル等の荷重検出センサを付設
するだけの簡単な改造を施すだけで、その標準貫入試験
機を用いて標準貫入試験と引抜き抵抗力の測定とを一連
に行うことができ、引抜き抵抗力を測定するためだけの
専用の機械が不要であるとともに、標準貫入試験のみを
行う場合と同程度の手間で標準貫入試験と引抜き抵抗の
測定とを作業性良く行うことができる。Furthermore, since the pull-out resistance is measured at the time of pulling out the test piece in the standard penetration test, simply modifying the standard penetration tester for performing the standard penetration test by simply attaching a load detection sensor such as a load cell Therefore, the standard penetration tester can be used to perform a series of standard penetration tests and pullout resistance measurements in series, and there is no need for a dedicated machine for measuring pullout resistance, and only the standard penetration test is possible. It is possible to perform the standard penetration test and the measurement of the pull-out resistance with good workability in the same amount of labor as in the case of
従って、本発明によれば、杭の設計を不必要に大きな安
全率を見込むことなく行えて、杭の材料費呼び施工費を
少なくでき、全体として、建設費のコストダウンを図る
ことができる実用的で、かつ、精度が高くて信頼性が高
い杭の周面摩擦力を得ることができ、しかも、標準貫入
試験を行うことができる地盤の全部を調査対象として周
面摩擦力を得ることができ、その上、作業性良く低コス
トで実施することができる地盤調査方法を提供できるよ
うになった。Therefore, according to the present invention, it is possible to design a pile without unnecessarily considering a large safety factor, reduce the material cost and construction cost of the pile, and reduce the construction cost as a whole. It is possible to obtain the peripheral frictional force of a pile that is objective, highly accurate, and highly reliable, and that can be subjected to a standard penetration test on all grounds to be investigated. In addition, it has become possible to provide a ground survey method that can be performed with good workability and low cost.
以下、図面に基づいて、本発明による地盤調査方法の実
施例を説明する。An embodiment of the ground survey method according to the present invention will be described below with reference to the drawings.
まず、地盤調査を行うための装置の概略を述べる。この
装置は、よく知られている標準貫入試験を行うための装
置であって、第２図に示すように、地盤(G)上に組み立
てたやぐら(1)、ハンマー(2)、やぐら(1)に取り付けら
れた滑車(3)に巻き掛けられてハンマー(2)を吊り上げる
吊上用ワイヤ(4)、及び、ハンマー(2)に内嵌して立設さ
れたロッド(5)等から構成されている。First, the outline of an apparatus for performing ground survey will be described. This device is a well-known device for performing a standard penetration test. As shown in FIG. 2, a yagura (1), a hammer (2), and a yagura (1) assembled on the ground (G). ), A wire (4) for hoisting the hammer (2) wrapped around a pulley (3), and a rod (5) that is fitted inside the hammer (2) and stands upright. Has been done.
ロッド(5)の先端には、地盤(G)にボーリング孔を掘削す
るための穿孔具と、地盤(G)の性状を調査するための試
験片であるサンプラーとを、夫々別々に装着することで
きるように構成されている。また、このロッド(5)は、
回転駆動装置(6)に連動する状態と連動しない状態とに
切り替えられるように構成されている。At the tip of the rod (5), a drilling tool for drilling a boring hole in the ground (G) and a sampler as a test piece for investigating the properties of the ground (G) should be mounted separately. It is configured to be able to. Also, this rod (5)
The rotation driving device (6) is configured to be switched between a state in which it is linked and a state in which it is not linked.
そして、ロッド(5)の先端に穿孔具を装着するとともに
ロッド(5)を回転駆動装置(6)に連動させることで地盤
(G)にボーリング孔(H)を掘削することができるように、
一方、ロッド(5)の先端にサンプラーを装着するととも
にロッド(5)と回転駆動装置(6)との連動を断つことでロ
ッド(5)に付設したノッキングヘッド(7)上にハンマー
(2)を自由落下させてサンプラーを地盤(G)内に打ち込め
るように構成してある。Then, by attaching a punching tool to the tip of the rod (5) and interlocking the rod (5) with the rotary drive device (6),
To be able to drill a boring hole (H) in (G),
On the other hand, by attaching a sampler to the tip of the rod (5) and disconnecting the interlocking between the rod (5) and the rotary drive (6), a hammer is placed on the knocking head (7) attached to the rod (5).
(2) is allowed to fall freely and the sampler can be driven into the ground (G).
ロッド(5)の上端には、地盤(G)内に打ち込み貫入したサ
ンプラーを引き抜くための引抜用ワイヤ(8)が止着され
ている。そして、この引抜用ワイヤ(8)の中間部に、サ
ンプラーを引き抜くときの引抜き抵抗力を測定するため
のロードセル(9)を介装してある。ロードセル(9)により
測定された引抜き抵抗力から、杭の周面摩擦力を求める
ことができる。A pull-out wire (8) for pulling out the sampler driven into the ground (G) is fixed to the upper end of the rod (5). A load cell (9) for measuring the pulling resistance force when pulling out the sampler is provided in the middle of the pulling wire (8). From the pull-out resistance force measured by the load cell (9), the peripheral frictional force of the pile can be obtained.
次に、この装置を用いた地盤調査を工程順に説明する。Next, a ground survey using this device will be described in the order of steps.
まず、第１図(イ)に示すように、ロッド(5)の先端にビッ
ト(5a)を付設した穿孔具(5A)を装着し、地盤(G)にボー
リング孔(H)を穿孔する。ボーリング孔(H)が所定深さ
（例えば、地表面から１ｍ）になれば、穿孔を中止す
る。その後、ロッド(5)を引き上げ、第１図(ロ)に示すよ
うに、穿孔具(5A)に替えてサンプラー(5B)を装着し、第
１図(ハ)に示すように、このサンプラー(5B)を、ボーリ
ング孔(H)の底にセットする。First, as shown in FIG. 1 (a), a drilling tool (5A) having a bit (5a) attached to the tip of a rod (5) is mounted, and a boring hole (H) is drilled in the ground (G). When the boring hole (H) reaches a predetermined depth (for example, 1 m from the ground surface), the boring is stopped. After that, the rod (5) is pulled up, and as shown in Fig. 1 (b), the puncher (5A) is replaced with a sampler (5B), and the sampler (5) is attached as shown in Fig. 1 (c). Set 5B) at the bottom of the boring hole (H).
そして、ロッド(5)と回転駆動装置(6)との連動を断ち、
第１図(ニ)に示すように、ハンマー(2)を引き上げて、ノ
ッキングヘッド(7)上に自由落下させて打撃することを
繰り返し、サンプラー(5B)を地盤(G)内に貫入させる。
サンプラー(5B)が地盤(G)内に30cm貫入するまでに要し
た打撃回数を計数したものがＮ値であり、土の硬軟や締
り具合を表す指標となる。Then, disconnect the interlocking between the rod (5) and the rotation drive device (6),
As shown in FIG. 1 (d), the hammer (2) is pulled up, dropped freely on the knocking head (7) and struck, and the sampler (5B) is penetrated into the ground (G).
The N value is a value obtained by counting the number of hits required for the sampler (5B) to penetrate into the ground (G) by 30 cm, which is an index showing the hardness and softness of soil and the tightness.
Ｎ値の計数が終了した後、第１図(ホ)に示すように、引
抜用ワイヤ(8)を用いてサンプラー(5B)の貫入部分を引
き抜く。このとき、ロードセル(9)により引抜き抵抗力
を測定する。この引抜き抵抗力から、杭の周面摩擦力を
求めることができる。なお、引抜用ワイヤ(8)を用いた
サンプラー(5B)の引抜きは、人力により行う方法でもよ
いし、引抜用ワイヤ(8)をウィンチに巻き取らせる等の
機械力により行う方法でもよい。After the N value has been counted, the penetrating portion of the sampler (5B) is pulled out using the pulling wire (8) as shown in FIG. 1 (e). At this time, the pullout resistance is measured by the load cell (9). From this pull-out resistance, the peripheral frictional force of the pile can be obtained. The pulling out of the sampler (5B) using the pulling wire (8) may be performed manually, or may be performed by a mechanical force such as winding the pulling wire (8) around a winch.
サンプラー(5B)を引き抜いた後は、再度サンプラー(5B)
に替えてビット(5a)付穿孔具(5A)を装着し、ロッド(5)
を回転駆動装置(6)に連動させてさらにボーリング孔(H)
を掘削する。サンプラー(5B)の打込みで既に30cmの孔が
形成されているので、ビット(5A)を用いてさらに70cmの
掘削を行う。After pulling out the sampler (5B), sampler (5B) again
In place of the rod (5), attach the perforator (5A) with bit (5a).
The boring hole (H)
To drill. Since a hole of 30 cm has already been formed by driving the sampler (5B), a further 70 cm is excavated using the bit (5A).
その後、穿孔具(5A)をサンプラー(5B)に替えて、Ｎ値と
引抜き抵抗力との測定を行い、以後、上述の動作を繰り
返しながら、次第にボーリング孔(H)を掘り進む。これ
により、地表から１ｍ毎にＮ値と引抜き抵抗力が得られ
ることとなる。なお、この１ｍという数字は適宜変更自
在で、よる精密な調査を行うなら地表から例えば50cm毎
とか75cm毎に行えばよい。また、測定の繰返し回数も不
問であり、所定の深さにおいて１回だけ測定してもよ
い。After that, the punching tool (5A) is replaced with a sampler (5B), the N value and the pull-out resistance are measured, and thereafter, the boring hole (H) is gradually dug while repeating the above operation. As a result, the N value and the pull-out resistance can be obtained every 1 m from the ground surface. The number of 1 m can be changed as appropriate, and if a precise survey is to be carried out, it may be done, for example, every 50 cm or 75 cm from the ground surface. Further, the number of times of repeating the measurement is not limited, and the measurement may be performed only once at a predetermined depth.
なお、地盤(G)内に貫入したサンプラー(5B)を引き抜く
ための構成は適宜変更可能である。例えば、第３図に示
すように、ロッド(5)をオイルジャッキ(10)により挾持
し、地盤(G)の表面を反力点にして持ち上げるように構
成してもよい。この場合には、より細かい、例えば引抜
速度等の制御も容易に行うことができ、それにより、よ
り正確な引抜き抵抗力を測定することができる。The configuration for pulling out the sampler (5B) penetrating into the ground (G) can be changed as appropriate. For example, as shown in FIG. 3, the rod (5) may be held by an oil jack (10) and lifted with the surface of the ground (G) as a reaction point. In this case, finer control such as drawing speed can be easily performed, and thereby more accurate drawing resistance force can be measured.
尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
により実施される方法に限定されるものではない。It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the method embodied by the structure of the accompanying drawings by the entry.
図面は本発明に係る地盤調査方法の実施例を示し、第１
図(イ)ないし(ホ)は工程毎の概略断面図、第２図は調査を
行う装置の概略断面図、第３図は調査を行う装置の別の
実施例を示す第２図に相当する概略断面図である。 (5B)……調査片、(G)……地盤。The drawings show an embodiment of the ground survey method according to the present invention.
Figures (a) to (e) are schematic cross-sectional views of each step, FIG. 2 is a schematic cross-sectional view of an inspection apparatus, and FIG. 3 is equivalent to FIG. 2 showing another embodiment of the inspection apparatus. It is a schematic sectional drawing. (5B) …… Survey strip, (G) …… Ground.
フロントページの続き (72)発明者 大槻 朝雄 東京都目黒区東が丘２丁目11番16号 株式 会社東京ソイルリサーチ内 (56)参考文献 実開 昭54−130706（ＪＰ，Ｕ) 特公 昭46−1498（ＪＰ，Ｂ１)Front Page Continuation (72) Inventor Asao Otsuki 2-11-16 Higashigaoka, Meguro-ku, Tokyo Within Tokyo Soil Research Co., Ltd. (56) References (JP, B1)
Claims (1)
入試験を行って前記地盤(G)の性状を調査する地盤調査
方法であって、前記貫入試験として、試験片(5B)を地盤
(G)内に所定量貫入するまで打ち込んでＮ値を測定する
標準貫入試験を行い、その標準貫入試験における打ち込
み後の試験片(5B)の地盤(G)からの引き抜き時にその引
抜き抵抗力を測定する地盤調査方法。1. A ground investigation method for investigating the properties of the ground (G) by performing a penetration test by penetrating the test piece (5B) into the ground (G), wherein the test piece is used as the penetration test. Ground (5B)
Perform a standard penetration test to measure the N value by driving into the (G) until a predetermined amount is penetrated, and in the standard penetration test, when pulling out the test piece (5B) after driving from the ground (G), the pull-out resistance force Ground survey method to measure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61302370A JPH0621446B2 (en) | 1986-12-17 | 1986-12-17 | Ground survey method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61302370A JPH0621446B2 (en) | 1986-12-17 | 1986-12-17 | Ground survey method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63156110A JPS63156110A (en) | 1988-06-29 |
| JPH0621446B2 true JPH0621446B2 (en) | 1994-03-23 |
Family
ID=17908081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61302370A Expired - Lifetime JPH0621446B2 (en) | 1986-12-17 | 1986-12-17 | Ground survey method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621446B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0754307B2 (en) * | 1989-07-31 | 1995-06-07 | 西部瓦斯株式会社 | Soil moisture content measurement method |
| JP3928956B2 (en) * | 2003-03-26 | 2007-06-13 | ライト工業株式会社 | Ground anchor loading test method and test apparatus therefor |
| JP4829663B2 (en) * | 2006-04-13 | 2011-12-07 | 学校法人 中央大学 | In-situ shear strength measuring device |
| JP4607977B2 (en) * | 2008-03-10 | 2011-01-05 | 株式会社ポラス暮し科学研究所 | Soil sampling device |
| JP2014095645A (en) * | 2012-11-12 | 2014-05-22 | Univ Of Tokushima | Pull-out testing device |
| JP2014122464A (en) * | 2012-12-20 | 2014-07-03 | Oyo Corp | Subsurface exploration method and subsurface exploration apparatus |
| JP6256880B2 (en) * | 2014-06-10 | 2018-01-10 | 応用地質株式会社 | Ground survey method and ground survey device |
| JP7027392B2 (en) * | 2019-12-11 | 2022-03-01 | 東光電気工事株式会社 | Boring device for geological survey |
| CN111997102B (en) * | 2020-07-11 | 2021-09-17 | 中铁二十四局集团江苏工程有限公司 | Screw pile composite foundation bearing capacity detection device |
-
1986
- 1986-12-17 JP JP61302370A patent/JPH0621446B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63156110A (en) | 1988-06-29 |
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