JPH06102887B2 - Ground soil detection method - Google Patents
Ground soil detection methodInfo
- Publication number
- JPH06102887B2 JPH06102887B2 JP29844686A JP29844686A JPH06102887B2 JP H06102887 B2 JPH06102887 B2 JP H06102887B2 JP 29844686 A JP29844686 A JP 29844686A JP 29844686 A JP29844686 A JP 29844686A JP H06102887 B2 JPH06102887 B2 JP H06102887B2
- Authority
- JP
- Japan
- Prior art keywords
- penetration
- pile
- soil
- ground
- pile body
- 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 - Fee Related
Links
- 239000002689 soil Substances 0.000 title claims description 16
- 238000001514 detection method Methods 0.000 title claims description 6
- 230000035515 penetration Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 4
- 241001428397 Taito Species 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【発明の詳細な説明】 （発明が属する技術分野） 本発明は地盤土性（地盤強度等）を検出する技術に関す
る。Description: TECHNICAL FIELD The present invention relates to a technique for detecting ground soil properties (ground strength, etc.).
（発明の課題とその特徴点） 地盤土性の検出（サウンデイング）は従来、専用の試験
機を用いて行われているのが通例であるが、本発明は、
振動貫入杭体を利用してその貫入作業と併行して地盤土
性の検出を行う新規技術の提供を目的としているもので
あつて、その構成上の特徴は特許請求の範囲に記載した
とおりである。(Problems of the Invention and Characteristic Points Thereof) Conventionally, detection of ground soil properties (sounding) is conventionally performed using a dedicated tester, but the present invention is
The purpose of the present invention is to provide a new technique for detecting ground soil properties in parallel with the penetration work using the vibration penetration pile body, and the structural features thereof are as described in the claims. is there.
すなわち、本発明方法は、振動貫入杭体の貫入速度と地
盤土性との相関関係を利用して、振動貫入杭体の貫入速
度から地盤土性を間接的に検出するものであつて、利用
する振動貫入杭体の貫入速度と地盤土性との具体的相関
関係は実験若しくは実績のデータから求める。That is, the method of the present invention utilizes the correlation between the penetration speed of the vibration intrusion pile body and the soil soil property to indirectly detect the soil soil property from the penetration speed of the vibration intrusion pile body. The concrete correlation between the penetration speed of the vibrating intrusive pile and the soil characteristics is obtained from experimental or actual data.
（発明の具体的説明） 以下、本発明の実施態様を図面により説明する。(Detailed Description of the Invention) Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は実績データか得られた振動貫入杭体の貫入速度
と地盤強度との関係を対数目盛の座標でグラフ表示した
ものであつて、縦座標：υは振動貫入杭体の貫入速度、
横座標:P/Qの分子Ｐは振動貫入機の起振力、分母Ｑは杭
体先端抵抗と杭体周面摩擦抵抗の和である。Fig. 1 is a graph showing the relationship between the penetration speed and ground strength of the vibration penetration pile obtained from the actual data in the coordinates of logarithmic scale. The ordinate: υ is the penetration speed of the vibration penetration pile.
Abscissa: P / Q numerator P is the vibratory force of the vibration penetrator, and denominator Q is the sum of pile body tip resistance and pile body frictional resistance.
そして、Ｑは一般的に、 で表わされ（K:常数、N:杭体先端Ｎ値、Ap:杭体先端面
積、：杭体周面平均Ｎ値、As:杭体周面積）、本発明
の検出目標は前式中のＮ（杭体先端Ｎ値）である。And Q is generally (K: constant, N: pile tip N value, Ap: pile tip area ,: pile circumferential surface average N value, As: pile circumferential area), and the detection target of the present invention is in the previous equation. Is N (pile body tip N value).
本発明ではまず、振動貫入機１で杭体２を地中に貫入す
る際に、深度検出器３で杭体２の下端深度を連続的に検
出するが（第２図参照）、図示の深度検出器３は、杭体
２の貫入に応じて移動するエンドレスワイヤ４でプーリ
ー５を回転させ、その回転量を例えばポテンシヨメータ
により電圧として検出し、これをデジタル信号に変換し
て、演算装置６に送るようになつている。In the present invention, first, when the pile body 2 is penetrated into the ground by the vibration penetrator 1, the depth detector 3 continuously detects the lower end depth of the pile body 2 (see FIG. 2). The detector 3 rotates the pulley 5 with the endless wire 4 that moves according to the penetration of the pile 2, detects the amount of rotation as a voltage with, for example, a potentiometer, converts this into a digital signal, and an arithmetic unit It is supposed to be sent to 6.
図示の演算装置６は記憶部７、演算部８、表示部９を含
み、記憶部７では一定の時間間隔ｔ毎にT1→GL1，T2→G
L2，…Tn→GLnのように順次入れられる杭体２の下端深
度のデータを記憶し、演算部８では、記憶部７のデータ
に基づきGLn-GL1/Tn-T1の演算を行つて所定の時間（Tn-
T1＝nt）における平均の貫入速度を算出するとともに、
前述の貫入速度と地盤強度との相関関係を利用して、前
記Ｑの式のＮ（杭体先端Ｎ値）の算出を行い、表示部９
ではこの算出値を表示し、記録する。The illustrated computing device 6 includes a storage unit 7, a computing unit 8, and a display unit 9, and in the storage unit 7, T 1 → GL 1 and T 2 → G at fixed time intervals t.
Data of the lower end depth of the pile body 2 which is sequentially inserted as L 2 , ... T n → GL n is stored, and the calculation unit 8 calculates GL n -GL 1 / T n -T 1 based on the data of the storage unit 7. For a predetermined time (T n-
Calculate the average penetration velocity at T 1 = nt)
Utilizing the above-mentioned correlation between the penetration speed and the ground strength, N (pile body tip N value) in the above Q formula is calculated and displayed on the display unit 9
Then, display and record this calculated value.
記憶部７の記憶データは時間ｔの経過毎に右方へ順次移
され、右端の古いデータが消えて左端へ新しいデータが
入るようになつており、このようにして記憶部７のデー
タが変る毎にＮの算出を行うが、この際、それ以前のＮ
の算出値を用いて前記Ｑの式の（杭体周面平均Ｎ値）
の算出を行う演算操作が伴うことは言うまでもない。The data stored in the storage unit 7 is sequentially moved to the right every time t has passed, old data at the right end disappears and new data enters at the left end, and thus the data in the storage unit 7 changes. N is calculated for each, but at this time, N before that is calculated.
Using the calculated value of
It goes without saying that a calculation operation for calculating
なお、所定の貫入長における平均の貫入速度を算出して
これを用いる場合は、算出値の逆数で第１図の相関関係
を利用すればよい。In addition, when calculating and using the average penetration speed in a predetermined penetration length, the correlation of FIG. 1 may be used by the reciprocal of the calculated value.
以上、本発明の一実施態様について説明したが、本発明
はこれに限定されるものではない。Although one embodiment of the present invention has been described above, the present invention is not limited to this.
（発明の効果） 本発明は、以上のようなものであつて、振動貫入杭体を
利用してその貫入作業と併行して地盤土性の検出を行う
ものであるから、その検出結果を直ちに利用して効果的
な杭体打設を行うことができ、所定の時間若しくは貫入
長における平均の貫入速度を算出し、これに基いて地盤
土性を検出するようにしているので、誤差の少ない信頼
できる検出値を得ることができる、等の諸効果が期待で
きる。(Effects of the invention) The present invention is as described above, and since the ground penetration is detected in parallel with the penetration work using the vibration penetration pile body, the detection result is immediately It can be used for effective pile driving, and the average penetration speed at a predetermined time or penetration length is calculated, and the ground soil property is detected based on this, so there is little error. Various effects such as obtaining a reliable detection value can be expected.
図面は本発明の一実施態様の説明図であつて、第１図は
振動貫入杭体の貫入速度と地盤強度との相関関係図、第
２図は全体図である。 １……振動貫入機、２……杭体、３……深度検出器、６
……演算装置、……。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 1 is a correlation diagram between a penetration speed of a vibration penetration pile and ground strength, and FIG. 2 is an overall view. 1 ... Vibration penetrator, 2 ... Piles, 3 ... Depth detector, 6
…… Computing device …….
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 忠良 東京都台東区台東１丁目２番１号 不動建 設株式会社内 (72)発明者 杉本 直裕 東京都台東区台東１丁目２番１号 不動建 設株式会社内 (72)発明者 田村 徹 東京都台東区台東１丁目２番１号 不動建 設株式会社内 (56)参考文献 特開 昭59−173416（ＪＰ，Ａ) 特開 昭61−28615（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tadayoshi Maeda 1-2-1 Taito, Taito-ku, Tokyo Fudo Construction Co., Ltd. (72) Inventor Naohiro Sugimoto 1-2-1 Taito, Taito-ku, Tokyo Fudo Construction Company (72) Inventor Toru Tamura 1-2-1, Taito, Taito-ku, Tokyo Fudo Construction Company (56) Reference JP-A-59-173416 (JP, A) JP-A-61- 28615 (JP, A)
Claims (1)
深度検出器で杭体の下端深度を連続的に検出し、この検
出値を用いて演算装置で所定の時間若しくは貫入長にお
ける平均の貫入速度を算出し、この算出値を用いて貫入
速度と地盤土性との相関関係から杭体先端の地盤土性を
検出することを特徴とする地盤土性の検出方法。1. When a pile body is penetrated into the ground by a vibration penetration machine,
The depth detector continuously detects the bottom depth of the pile body, and the detection value is used to calculate the average penetration speed at a predetermined time or penetration length, and the calculated value is used to calculate the penetration speed and the ground. A method for detecting soil soil properties, which comprises detecting soil soil properties at the tip of a pile from a correlation with soil soil properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29844686A JPH06102887B2 (en) | 1986-12-15 | 1986-12-15 | Ground soil detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29844686A JPH06102887B2 (en) | 1986-12-15 | 1986-12-15 | Ground soil detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63151709A JPS63151709A (en) | 1988-06-24 |
| JPH06102887B2 true JPH06102887B2 (en) | 1994-12-14 |
Family
ID=17859815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29844686A Expired - Fee Related JPH06102887B2 (en) | 1986-12-15 | 1986-12-15 | Ground soil detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06102887B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013253462A (en) * | 2011-09-28 | 2013-12-19 | Shimizu Corp | Improving body measuring device and improving body measuring method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6029528B2 (en) * | 2013-05-08 | 2016-11-24 | 大成建設株式会社 | Ground evaluation method |
| JP6667263B2 (en) * | 2015-11-09 | 2020-03-18 | 東京電力ホールディングス株式会社 | Vibration impact type light ground survey machine and vibration impact type ground survey method |
| JP7311244B2 (en) * | 2018-03-07 | 2023-07-19 | 株式会社大林組 | Ground evaluation system and ground evaluation method |
| JP7750768B2 (en) * | 2022-02-21 | 2025-10-07 | 積水化学工業株式会社 | Ground investigation method |
-
1986
- 1986-12-15 JP JP29844686A patent/JPH06102887B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013253462A (en) * | 2011-09-28 | 2013-12-19 | Shimizu Corp | Improving body measuring device and improving body measuring method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63151709A (en) | 1988-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |