JPH05239826A - Schedule control method of foundation improvement construction utilizing jet - Google Patents
Schedule control method of foundation improvement construction utilizing jetInfo
- Publication number
- JPH05239826A JPH05239826A JP4132592A JP4132592A JPH05239826A JP H05239826 A JPH05239826 A JP H05239826A JP 4132592 A JP4132592 A JP 4132592A JP 4132592 A JP4132592 A JP 4132592A JP H05239826 A JPH05239826 A JP H05239826A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- liquid jet
- jet
- improvement
- sensor
- 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.)
- Granted
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はセメント等の固化材を
含む改良液ジェット噴流を地中に噴射して周囲の土砂を
削り取りながら混合撹拌することによって、地中に柱状
等の固化体を構築する地盤改良工事における工程管理方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constructs a solidified body such as a pillar in the ground by jetting an improved liquid jet jet containing a solidifying material such as cement into the ground and mixing and stirring while scraping off the surrounding earth and sand. The present invention relates to a process control method for ground improvement work.
【０００２】[0002]
【従来技術】ジェット噴流を利用した地盤改良工法は図
４のように地上から改良液ジェットの噴流管１を所定深
さ立込み、管の先端からセメント系スラリーの改良液ジ
ェット２を噴射し、周囲の土砂を削り取ると同時に混合
撹拌し、地中に柱状の固化体３を形成する。従来、この
改良工事の工程管理には図５のように噴射管１の周囲の
施工領域の周囲数ケ所にロッド４を立込み、施工中に改
良液ジェット２が当った振動を加速計５で感知して改良
液の到達を検出しこれにより、改良液により形成される
固化体３の出来形を判定していた。2. Description of the Related Art As shown in FIG. 4, a ground improvement method using a jet jet projects a jet pipe 1 of an improved liquid jet from the ground to a predetermined depth and jets an improved liquid jet 2 of cement slurry from the tip of the pipe. At the same time as shaving off the surrounding earth and sand, the mixture is mixed and stirred to form a columnar solidified body 3 in the ground. Conventionally, for the process control of this improvement work, as shown in FIG. 5, rods 4 are set up at several places around the injection pipe 1 and the vibration of the improvement liquid jet 2 during the execution is accelerated by an accelerometer 5. The arrival of the improving liquid was detected to detect the quality of the solidified body 3 formed by the improving liquid.
【０００３】また、改良液の注入量や噴射圧力などの値
をもとに人の経験で工程を管理し、出来形を判定してい
た。Further, the process is controlled by the experience of a person based on the values such as the injection amount and the injection pressure of the improving liquid to judge the finished product.
【０００４】[0004]
【発明が解決しようとする課題】従来のロッドによる工
程の管理方法では、地中であるために、改良液のジェ
ットがロッドに近くなってくると、土砂全体の振動を感
知するために改良液ジェットの到達を正確に測定ができ
ず、このために施工工程において正確な施工出来形を知
ることは難しかった。また、地盤条件の違いによって振
動の大きさも変化し、定量的判断ができなかった。改
良液ジェットの到達位置は平面の次元でしか検知できな
いので、深さ方向は噴射管の挿入深さから間接的に推定
するしかなかった。注入量や噴射圧力などの値をもと
に人が判断する方法では地盤条件や人の能力によって大
きなバラツキが生じ信頼性が低かった。In the conventional method of managing a process using a rod, when the jet of the improving liquid comes close to the rod because it is underground, the improving liquid is used to detect the vibration of the whole earth and sand. Since the arrival of the jet cannot be measured accurately, it was difficult to know the exact workable form in the construction process. In addition, the magnitude of vibration also changed depending on the ground conditions, making it impossible to make a quantitative determination. Since the arrival position of the improved liquid jet can be detected only in the plane dimension, the depth direction can only be indirectly estimated from the insertion depth of the injection pipe. The method in which a person makes a judgment based on the values such as the injection amount and the injection pressure causes a large variation depending on the ground condition and the ability of the person, and the reliability is low.
【０００５】この発明は上記問題点に着目しなされたも
のである。その目的は、施工の時点で改良液の到達地点
を平面および深さの位置で三次元的に、精度高く、リア
ルタイムに検知して、固結体の出来形を正確に判定して
工程の制御ができるジェット噴流を利用した地盤改良工
事の工程管理方法を提案するにある。The present invention has been made in view of the above problems. The purpose is to detect the arrival point of the improvement liquid three-dimensionally with high accuracy in real time at the time of construction at the position of the plane and the depth, and accurately determine the quality of the solidified body to control the process. The purpose is to propose a process control method for ground improvement work using a jet jet that can be used.
【０００６】[0006]
【課題を解決するための手段】この発明になるジェット
噴流を利用した地盤改良工事の工程管理方法は固化材を
含む改良液ジェットを地中に噴射して周囲の土砂を削り
取り、混合して地中に固化体を形成する地盤改良工事に
おいて、改良液ジェット噴射管周囲の地盤内にペーハー
センサーを取付けたセンサー棒を立込み、改良液ジェッ
ト噴流によって変化した地中のペーハーを測定し、ペー
ハー変化を感知したペーハーセンサーの位置から、改良
液ジェット到達位置を検出することを特徴とする。A process control method for ground improvement work using a jet jet according to the present invention is to inject an improved liquid jet containing a solidifying agent into the ground to scrape off the surrounding earth and sand and mix the ground. In the ground improvement work that forms a solidified body inside, a sensor rod with a pH sensor is set up in the ground around the improved liquid jet injection pipe, the pH in the ground changed by the improved liquid jet jet is measured, and the pH change It is characterized in that the improved liquid jet arrival position is detected from the position of the pH sensor which has sensed.
【０００７】セメント等の固化材を含む改良液は高いペ
ーハー値を示すので、施工前の地中のペーハー値と著し
く相違する。この方法は地中に立込んだセンサー棒に取
付けたペーハーセンサーによってペーハー値の変化を測
定して、その地点に改良液ジェットが到達したことを検
出する。そして、ペーハー値の変化を感知したペーハー
センサーのセンサー棒立込み位置およびペーハーセンサ
ーのセンサー棒への取付け位置から、改良液ジェットが
到達した地点を平面位置および深さの三次元でリアルタ
イムで知ることができる。この情報を施工工程にフィー
ドバックして工程管理して所望の出来形の固化体を構築
するものである。Since the improving liquid containing a solidifying material such as cement shows a high pH value, it is significantly different from the pH value in the ground before the construction. This method measures the change in pH value by a pH sensor attached to a sensor rod standing in the ground, and detects that the improved liquid jet has reached that point. Then, from the position where the pH sensor detects the change in pH value and the position where the pH sensor is attached to the sensor rod, to know in real time the three-dimensional plane position and depth at which the improved liquid jet has arrived. You can This information is fed back to the construction process and the process is controlled to construct a solidified product of a desired finished shape.
【０００８】図１は地中に立込んだセンサー棒６であ
り、所定間隔位置に複数のペーハーセンサー７−１，７
−２，…７−ｎが取付けてある。センサー棒６は中空体
で、ペーハーセンサー７はセンサー棒６に穿設したセン
サーホール８の内側に収納され、それぞれ地上のペーハ
ー表示器９およびパーソナルコンピュータ１０に直列に
連結してある。FIG. 1 shows a sensor rod 6 standing in the ground, and a plurality of pH sensors 7-1 and 7 are arranged at predetermined intervals.
-2 ... 7-n are attached. The sensor rod 6 is a hollow body, and the pH sensor 7 is housed inside a sensor hole 8 formed in the sensor rod 6 and connected in series to a pH indicator 9 and a personal computer 10 on the ground, respectively.
【０００９】このセンサー棒６は、例えば図２のごとく
改良液ジェットの噴射管１を中心とする直交する４放射
方向位置および１放射方向の所定間隔位置を選び垂直に
所定深さ立込まれる。施工に先だち、各センサー棒６の
周囲地中のペーハー値を測定記録しておく。噴射管１は
回転させつつ先端から改良液ジェット２を噴射し土砂を
削り取り、混合撹拌しつつ、徐々に引上げて行く。施工
が進むに従い、改良液ジェット２が到達する。領域（斜
線部分）が拡がる。この領域の変化を感知したペーハー
センサー７のセンサー棒の立込み位置、およびセンサー
棒への取付け位置から現在施工中の改良液ジェットの到
達地点を三次元でリアルタイムに検出する。For example, as shown in FIG. 2, the sensor rod 6 is vertically erected to a predetermined depth by selecting four radial direction positions and a predetermined interval position in one radial direction which are orthogonal to each other around the injection pipe 1 of the improved liquid jet. Prior to the construction, the pH value in the ground around each sensor rod 6 is measured and recorded. The jet pipe 1 is rotated and jets the improving liquid jet 2 from the tip to scrape off the earth and sand, and gradually pulls it up while mixing and stirring. As the construction proceeds, the improved liquid jet 2 arrives. The area (hatched area) expands. The arrival position of the improved liquid jet currently under construction is three-dimensionally detected in real time from the position where the sensor rod of the pH sensor 7 senses the change in this area and the position where it is attached to the sensor rod.
【００１０】測定したデーターはコンピュータ１０に入
力し、改良液ジェットの到達地点を三次元表示、平面位
置表示、あるいは各センサー棒別の深さなどで表示す
る。この情報を施工工程にフィードバックして工程を管
理して施工し、所望の出来形の固化体を形成し地盤改良
を行なう。また、計測データはフロッピーディスクなど
の記録装置に保管し、必要に応じ随時図形等の表示でき
る。The measured data is input to the computer 10, and the arrival point of the improved liquid jet is displayed in a three-dimensional display, a plane position display, or the depth of each sensor rod. This information is fed back to the construction process and the process is managed and construction is carried out to form a solidified body of the desired finished shape and to improve the ground. Further, the measurement data is stored in a recording device such as a floppy disk, and a graphic or the like can be displayed as needed.
【００１１】図３は噴射管１を中心に直交する４放射方
向の４地点Ａ，Ｂ，Ｃ，Ｄ位置およびＡ方向等間隔のＡ
−１，Ａ−２，Ａ−３位置にセンサー棒６を設置し、各
センサー棒には深さレベルａ，ｂ，ｃ，ｄ，ｅ，ｆ位置
にセンサー７を取付けることにより、改良液の到達を三
次元で把握し、固化体の出来形を立体的に表示した例で
ある。FIG. 3 shows four points A, B, C and D in four radial directions orthogonal to the injection pipe 1 and A at equal intervals in the A direction.
By installing the sensor rods 6 at the -1, A-2, A-3 positions and attaching the sensors 7 at the depth levels a, b, c, d, e, f positions to the respective sensor rods, This is an example of grasping the arrival in three dimensions and displaying the solidified product in three dimensions.
【００１２】[0012]
【作用および発明の効果】この地盤改良工事の工程管理
方法は、予め設置してあるセンサー棒のペーハセンサ
ーがペーハーの変化から改良液ジェットの到達を検出す
るので、センサー棒の立込み位置およびペーハーセンサ
ーの取付け位置から改良液ジェットの到達を平面位置お
よび深さの三次元で正確に把握できる。この測定は施
工の進行と同時に行なわれ、リアルタイムに固化体の出
来形を判定できる。このリアルタイムに得られる情報
を施工工程にフィードバックし、噴射管の移動速度の調
整等を行ない工程管理をして所望の固化体を形成し、欠
陥のない地盤改良を能率よく施工できる。[Operation and effect of the invention] In this ground improvement work process control method, since the pH sensor of the sensor rod installed in advance detects the arrival of the improved liquid jet from the change in pH, the sensor rod standing position and pH are detected. The arrival of the improved liquid jet can be accurately grasped from the mounting position of the sensor in the three-dimensional plane position and depth. This measurement is performed at the same time as the construction progresses, and the finished shape of the solidified product can be determined in real time. The information obtained in real time is fed back to the construction process, the moving speed of the injection pipe is adjusted and the process is controlled to form a desired solidified body, and the ground can be efficiently improved without defects.
【図１】(a) は地中にセンサー棒を立込んだ状態を示す
断面図、(b) はセンサー棒の部分拡大図である。FIG. 1A is a sectional view showing a state where a sensor rod is erected in the ground, and FIG. 1B is a partially enlarged view of the sensor rod.
【図２】(a) は地盤改良工事において地中にセンサー棒
を立込み、改良液の到達領域を検出する状態を示す平面
図、(b) は断面図である。FIG. 2A is a plan view showing a state in which a sensor rod is erected in the ground to detect the reaching area of the improvement liquid in the ground improvement work, and FIG. 2B is a sectional view.
【図３】(a) は固化体の出来形を立体的に表示した図
面、(b) は改良液ジェットの到達位置を示す表である。FIG. 3 (a) is a three-dimensional view of the solidified product, and FIG. 3 (b) is a table showing the arrival position of the improved liquid jet.
【図４】ジェット噴流を利用した地盤改良工事の一部断
面で示す説明図である。FIG. 4 is an explanatory view showing a partial cross section of ground improvement work using a jet jet.
【図５】従来の地盤改良工事の工程管理の方法の説明図
である。FIG. 5 is an explanatory diagram of a conventional method of managing the process of ground improvement work.
１…噴射管、２…改良液ジェット、３…固化体、４…ロ
ッド、５…加速度計、６…センサーロッド、７…ペーハ
ーセンサー、８…センサーホール、９…ペーハー表示
器、１０…パーソナルコンピュータ。1 ... Injection pipe, 2 ... Improved liquid jet, 3 ... Solidified body, 4 ... Rod, 5 ... Accelerometer, 6 ... Sensor rod, 7 ... PH sensor, 8 ... Sensor hole, 9 ... PH indicator, 10 ... Personal computer ..
Claims (1)
射して周囲の土砂を削り取り、混合して地中に固化体を
形成する地盤改良工事において、改良液ジェット噴射管
周囲の地盤内にペーハーセンサーを取付けたセンサー棒
を立込み、改良液ジェット噴流によって変化した地中の
ペーハーを測定し、ペーハー変化を感知したペーハーセ
ンサーの位置から改良液ジェット到達位置を検出するこ
とを特徴とするジェット噴流を利用した地盤改良工事の
工程管理方法。1. In a ground improvement work for injecting an improved liquid jet containing a solidifying material into the ground to scrape off the surrounding earth and sand and mix it to form a solidified body in the ground, in the ground around the improved liquid jet injection pipe. It is characterized in that a sensor rod with a pH sensor attached to it is installed to measure the pH in the ground that has changed due to the jet flow of the improved liquid, and the arrival position of the improved liquid jet is detected from the position of the pH sensor that has detected the pH change. A process control method for ground improvement work using jet jets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4132592A JP2871265B2 (en) | 1992-02-27 | 1992-02-27 | Process control method of ground improvement work using jet jet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4132592A JP2871265B2 (en) | 1992-02-27 | 1992-02-27 | Process control method of ground improvement work using jet jet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05239826A true JPH05239826A (en) | 1993-09-17 |
| JP2871265B2 JP2871265B2 (en) | 1999-03-17 |
Family
ID=12605374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4132592A Expired - Lifetime JP2871265B2 (en) | 1992-02-27 | 1992-02-27 | Process control method of ground improvement work using jet jet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2871265B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020023969A (en) * | 2002-01-02 | 2002-03-29 | 이정우 | The effective diameter confirming method of Jet Grouting Method and its confirming pipe |
| JP2016020565A (en) * | 2014-07-12 | 2016-02-04 | 前田建設工業株式会社 | Formation method of ground improvement body |
| JP2017002716A (en) * | 2016-09-06 | 2017-01-05 | 三谷セキサン株式会社 | Pile hole excavation management method |
| JP2018123603A (en) * | 2017-02-02 | 2018-08-09 | 株式会社大阪防水建設社 | Outer edge checking apparatus for ground improvement body |
| JP2018131735A (en) * | 2017-02-13 | 2018-08-23 | 大成建設株式会社 | Construction status confirmation method for high pressure jet agitation work, method for creating soil improvement body using the same, and construction status information measuring device for high pressure jet agitation work |
| WO2019045217A1 (en) * | 2017-08-31 | 2019-03-07 | 주식회사 한세지반엔지니어링 | Underground injection pressure-controlled grouting method |
| JP2019073941A (en) * | 2017-10-18 | 2019-05-16 | 株式会社不動テトラ | Management method of construction of soil improvement body |
| JP2020197088A (en) * | 2019-06-04 | 2020-12-10 | 日本基礎技術株式会社 | Injection monitoring support system and injection monitoring support method |
| JP2021098986A (en) * | 2019-12-23 | 2021-07-01 | 株式会社竹中工務店 | Determination pipe of ground improvement body, and determination method of ground improvement body |
-
1992
- 1992-02-27 JP JP4132592A patent/JP2871265B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020023969A (en) * | 2002-01-02 | 2002-03-29 | 이정우 | The effective diameter confirming method of Jet Grouting Method and its confirming pipe |
| JP2016020565A (en) * | 2014-07-12 | 2016-02-04 | 前田建設工業株式会社 | Formation method of ground improvement body |
| JP2017002716A (en) * | 2016-09-06 | 2017-01-05 | 三谷セキサン株式会社 | Pile hole excavation management method |
| JP2018123603A (en) * | 2017-02-02 | 2018-08-09 | 株式会社大阪防水建設社 | Outer edge checking apparatus for ground improvement body |
| JP2018131735A (en) * | 2017-02-13 | 2018-08-23 | 大成建設株式会社 | Construction status confirmation method for high pressure jet agitation work, method for creating soil improvement body using the same, and construction status information measuring device for high pressure jet agitation work |
| WO2019045217A1 (en) * | 2017-08-31 | 2019-03-07 | 주식회사 한세지반엔지니어링 | Underground injection pressure-controlled grouting method |
| JP2019073941A (en) * | 2017-10-18 | 2019-05-16 | 株式会社不動テトラ | Management method of construction of soil improvement body |
| JP2020197088A (en) * | 2019-06-04 | 2020-12-10 | 日本基礎技術株式会社 | Injection monitoring support system and injection monitoring support method |
| JP2021098986A (en) * | 2019-12-23 | 2021-07-01 | 株式会社竹中工務店 | Determination pipe of ground improvement body, and determination method of ground improvement body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2871265B2 (en) | 1999-03-17 |
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