JP2003306931A - Creating method for underground hardened matter - Google Patents
Creating method for underground hardened matterInfo
- Publication number
- JP2003306931A JP2003306931A JP2002113789A JP2002113789A JP2003306931A JP 2003306931 A JP2003306931 A JP 2003306931A JP 2002113789 A JP2002113789 A JP 2002113789A JP 2002113789 A JP2002113789 A JP 2002113789A JP 2003306931 A JP2003306931 A JP 2003306931A
- Authority
- JP
- Japan
- Prior art keywords
- underground
- injection
- chemical
- curing agent
- cured product
- 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
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、建造物、トンネ
ル、土留め等を構築する場合に、地中に硬化剤又は薬液
を高圧で噴射攪拌してコラム状の硬化物を造成し、軟弱
な地盤を強化するための地中硬化物の造成方法に関する
ものである。
【０００２】
【従来の技術】従来の硬化剤又は薬液を用いた地中硬化
物の造成方法では、注入管を地中に所定の深さまで挿入
し、図６に示すように、注入管６を矢印Ｂの方向に連続
回転させながら噴射ノズル１０を介して硬化剤又は薬液
を放射状に噴射させ、注入管６を所定距離づつ段階的に
引き上げることにより、コラム状の地中硬化物１１を造
成していた。
【０００３】２０〜４０ＭＰａ程度の高圧で硬化剤又は
薬液を噴射すれば、４〜５ｍ程度まで地盤を切削するこ
とが可能とされる。
【０００４】
【発明が解決しようとする課題】しかし、噴射ノズル１
０から放射状に噴射される硬化剤又は薬液の噴流が注入
管６の回転により回転方向へ移動する周速は、ノズル１
０の噴射口近くでは遅くても、噴流２１の先端部では速
くなるので、矢印Ｆに示すように、噴流２１の先端部付
近では、硬化剤又は薬液が地耐力が弱い方向に流れる傾
向があり、均一には供給されない。
【０００５】従って、目的とする径Ｒのコラム状の地中
硬化物１１を得るためには、注入管６を１ステップで何
回も回転させて硬化剤又は薬液を繰り返し供給する必要
がある上、造成される地中硬化物１１の形状は、図７及
び図８に示すように、水平断面で周辺部の凹凸が大き
く、垂直断面では周辺部の垂れ下がった形状となり、理
想的な円柱形とはならない。また、余分な硬化剤又は薬
液が消費される。
【０００６】本発明は、地中硬化物の造成における上記
課題を解決するものであって、硬化剤又は薬液を均一に
供給して凹凸の小さいコラム状の地中硬化物を造成する
ことができ、硬化剤や薬液の消費量を低減することので
きる地中硬化物の造成方法を提供することを目的とす
る。
【０００７】
【課題を解決するための手段】本発明の地中硬化物の造
成方法では、先端部の側面に噴射ノズルを設けた注入管
を地中に挿入し、硬化剤又は薬液を注入管に高圧で供給
して噴射ノズルから噴射させ、注入管を断続的に回転さ
せると共に、所定距離づつ段階的に引き出すことにより
コラム状の地中硬化物を造成する。
【０００８】この地中硬化物の造成方法では、注入管を
断続的に回転させ、硬化剤又は薬液を噴射させる。即
ち、注入管は所定角度回転して停止し、硬化剤又は薬液
は、注入管の回転が停止した状態で一定時間同一方向に
高圧で噴射される。その後注入管は再び所定角度回転し
て停止し、硬化剤又は薬液が再び一定時間同一方向に噴
射される。以後これを繰り返し３６０度回転したところ
で１ステップの工程が終了し、注入管が所定距離引き上
げられて次のステップが開始される。
【０００９】このように、一定時間停止した状態で噴射
を行うことで、噴流が地盤を効果的に切削し、硬化剤又
は薬液が全方向に均一に注入され、凹凸が小さく円柱形
に近いコラム状の地中硬化物が造成される。また、硬化
剤や薬液の消費量も低減される。
【００１０】
【発明の実施の形態】図１は本発明の実施の一形態を示
す地中硬化物の造成方法に用いられる注入設備の構成
図、図２は回転断続装置の構成図、図３は硬化剤の噴射
状態の説明図、図４は造成された地中硬化物の水平断面
図、図５は造成された地中硬化物の垂直断面図である。
【００１１】図１の注入設備は、地盤１に注入孔２０を
穿孔し、硬化剤の注入を行うためのボーリングマシン２
と、このボーリングマシン２に高圧の水と硬化剤を供給
する供給プラント３で構成されている。ボーリングマシ
ン２には、注入管６に回転を与える油圧駆動のパワース
イベル５を搭載したガイドシェル４が傾動可能に支持さ
れている。ガイドシェル４には推進機構（図示略）が内
蔵されており、推進機構によってパワースイベル５をガ
イドシェル４に沿って上下に移動させる。
【００１２】注入管６の後端部には、スイベル７が設け
られており、供給プラント３から、高圧ホース８を介し
て、高圧の水と硬化剤とが回転する注入管６に供給でき
るようになっている。注入管６の前端部には下方噴射ノ
ズル９と水平方向噴射ノズル１０とが設けられている。
【００１３】また、パワースイベル５には、注入管６の
回転を断続させるため、回転断続装置１２が設けられて
いる。回転断続装置１２は、図２に示すように、注入管
６と共に回転する分割板１３と、ケーシング１６に固定
されたセンサ１４とを備えている。分割板１３には円周
方向に所定間隔で検出孔１５が設けられており、分割板
１３が回転して検出孔１５がセンサ１４と対向する位置
にきたとき、センサ１４はパワースイベル５の油圧制御
弁に停止信号を送り、所定時間回転を停止させる。
【００１４】従って、分割板１３に等間隔でｎ個の検出
孔１５を設けておけば、注入管６を（３６０／ｎ）度づ
つ断続回転させることができる。検出孔１５の個数、即
ち全周を何分割して注入を行うかは、地中硬化物１１を
造成する地盤１の地質によって予め決定される。地中硬
化物１１を造成する場合には、まず、供給プラント３か
ら注入管６に高圧水を供給し、下方噴射ノズル９から噴
射して地盤１に注入孔２０を所定の深さまで穿孔する。
【００１５】次に、下方噴射ノズル９の開口部を閉じて
水平方向噴射ノズル１０の開口部を開き、供給プラント
３から注入管６にモルタル等の硬化剤又は薬液を高圧で
供給して水平方向噴射ノズル１０から噴射する。このと
き、硬化剤又は薬液は、図３に示すように、注入管６の
回転が停止した状態で一定時間矢印Ａl の方向に高圧で
噴射される。その後注入管６は所定角度回転して停止
し、硬化剤又は薬液が一定時間矢印Ａ2 の方向に噴射さ
れる。
【００１６】以後回転と噴射とを繰り返し、矢印Ａn の
方向に噴射した後、矢印Ａl の方向に戻ったところで１
ステップの工程が終了し、注入管６を所定距離引き出し
て次のステップを開始する。このように注入管６を断続
的に回転させて噴射を行うことにより、噴流が地盤１を
効果的に切削し、硬化剤又は薬液が効率よく全方向に均
一に注入され、図４及び図５に示すように、凹凸が小さ
く円柱形に近いコラム状の地中硬化物１１が造成され
る。
【００１７】また、施工時間が短縮でき、硬化剤や薬液
の消費量も低減される。余分な噴射量が少なくなるた
め、注入孔２０の孔口からの排泥量も減少し、環境への
悪影響も少なくなる。表１にこの造成方法で１ｍ長の地
中硬化物を造成した場合と、従来の造成方法で１ｍ長の
地中硬化物を造成した場合のデータを対比して示す。
【００１８】
【表１】
【００１９】表１からこの造成方法が従来の造成方法よ
り効率よく地中硬化物１１を造成できることがわかる。
【００２０】
【発明の効果】以上説明したように、本発明の地中硬化
物の造成方法によれば、硬化剤又は薬液を均一に供給し
て凹凸の小さいコラム状の地中硬化物を造成することが
でき、硬化剤や薬液の消費量を低減することができる。
また、施工時間が短縮でき、硬化剤や薬液の消費量が低
減されて余分な噴射量が少なくなるため、注入孔の孔口
からの排泥量も減少し、環境への悪影響も少なくなる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a building, a tunnel, a retaining wall, etc., in which a hardener or a chemical is injected and stirred at high pressure into the ground to form a column. TECHNICAL FIELD The present invention relates to a method for forming an underground hardened material for forming a hardened material in a shape and strengthening soft ground. 2. Description of the Related Art In a conventional method of forming an underground cured product using a curing agent or a chemical solution, an injection pipe is inserted into the ground to a predetermined depth, and as shown in FIG. While continuously rotating in the direction of arrow B, a curing agent or a chemical solution is radially ejected through the ejection nozzle 10 and the injection pipe 6 is pulled up stepwise by a predetermined distance, thereby forming a columnar underground cured product 11. I was [0003] If a hardener or a chemical is sprayed at a high pressure of about 20 to 40 MPa, it is possible to cut the ground up to about 4 to 5 m. [0004] However, the injection nozzle 1
The peripheral speed at which the jet of the curing agent or the chemical solution ejected radially from 0 moves in the rotation direction by the rotation of the injection pipe 6 is the nozzle 1
However, as shown by arrow F, the hardener or the chemical tends to flow in the direction where the ground resistance is weaker near the tip of the jet 21 as it is faster at the tip of the jet 21 even if it is slow near the nozzle 0. , Not supplied uniformly. Therefore, in order to obtain a columnar underground cured product 11 having a desired diameter R, it is necessary to rotate the injection pipe 6 many times in one step to repeatedly supply the curing agent or the chemical. As shown in FIGS. 7 and 8, the shape of the underground hardened material 11 to be formed has large irregularities in the peripheral portion in a horizontal cross section and a drooping shape in the peripheral portion in a vertical cross section, and has an ideal cylindrical shape. Not be. In addition, excess hardener or chemical solution is consumed. The present invention has been made to solve the above-mentioned problems in the formation of an underground cured product, and can uniformly supply a curing agent or a chemical solution to form a columnar underground cured product having small irregularities. It is another object of the present invention to provide a method for forming an underground cured product capable of reducing the consumption of a curing agent and a chemical solution. [0007] In the method of forming an underground cured product of the present invention, an injection pipe provided with an injection nozzle on the side surface of the tip is inserted into the ground, and a curing agent or a chemical is injected into the injection pipe. Is supplied from the injection nozzle at high pressure, the injection pipe is intermittently rotated, and the column is pulled out stepwise by a predetermined distance to form a columnar underground cured product. [0008] In this method of forming an underground cured product, the injection pipe is intermittently rotated to spray a curing agent or a chemical solution. That is, the injection pipe rotates at a predetermined angle and stops, and the curing agent or the chemical is injected at a high pressure in the same direction for a certain period of time while the rotation of the injection pipe is stopped. Thereafter, the injection pipe rotates again by a predetermined angle and stops, and the curing agent or the chemical solution is again injected in the same direction for a certain time. Thereafter, when the rotation is repeated 360 degrees, the one-step process is completed, the injection tube is pulled up a predetermined distance, and the next step is started. As described above, by jetting the fuel while it is stopped for a certain period of time, the jet effectively cuts the ground, the hardener or the chemical liquid is uniformly injected in all directions, and the column with small irregularities and almost a cylindrical shape. An underground hardened material is created. In addition, the consumption of the curing agent and the chemical solution is reduced. FIG. 1 is a configuration diagram of an injection facility used in a method of forming an underground hardened material according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a rotary intermittent device, and FIG. FIG. 4 is an explanatory view of the state of injection of the curing agent, FIG. 4 is a horizontal sectional view of the formed underground cured product, and FIG. 5 is a vertical sectional view of the created underground cured product. The pouring equipment shown in FIG. 1 is a boring machine 2 for perforating a pouring hole 20 in a ground 1 and pouring a hardening agent.
And a supply plant 3 for supplying high-pressure water and a curing agent to the boring machine 2. The boring machine 2 supports a guide shell 4 mounted with a hydraulically driven power swivel 5 that rotates the injection pipe 6 in a tiltable manner. The guide shell 4 incorporates a propulsion mechanism (not shown), and the power swivel 5 is moved up and down along the guide shell 4 by the propulsion mechanism. A swivel 7 is provided at the rear end of the injection pipe 6 so that high-pressure water and a curing agent can be supplied from the supply plant 3 to the rotating injection pipe 6 via a high-pressure hose 8. It has become. At the front end of the injection pipe 6, a lower jet nozzle 9 and a horizontal jet nozzle 10 are provided. The power swivel 5 is provided with a rotation interrupting device 12 for interrupting the rotation of the injection tube 6. As shown in FIG. 2, the rotation interrupting device 12 includes a dividing plate 13 that rotates together with the injection pipe 6 and a sensor 14 fixed to a casing 16. The dividing plate 13 is provided with detection holes 15 at predetermined intervals in the circumferential direction. When the dividing plate 13 rotates and the detection hole 15 comes to a position facing the sensor 14, the sensor 14 detects the hydraulic pressure of the power swivel 5. A stop signal is sent to the control valve to stop the rotation for a predetermined time. Therefore, if n number of detection holes 15 are provided in the dividing plate 13 at equal intervals, the injection pipe 6 can be intermittently rotated by (360 / n) degrees. The number of the detection holes 15, that is, how many divisions are made to inject the whole circumference is determined in advance by the geology of the ground 1 on which the underground hardened material 11 is formed. When the underground hardened material 11 is formed, first, high-pressure water is supplied from the supply plant 3 to the injection pipe 6 and injected from the lower injection nozzle 9 to pierce the ground 1 with the injection hole 20 to a predetermined depth. Next, the opening of the lower injection nozzle 9 is closed and the opening of the horizontal injection nozzle 10 is opened, and a hardening agent such as mortar or a chemical solution is supplied from the supply plant 3 to the injection pipe 6 at a high pressure. Inject from the injection nozzle 10. At this time, as shown in FIG. 3, the curing agent or the chemical is injected at a high pressure in the direction of the arrow Al for a certain time while the rotation of the injection pipe 6 is stopped. Thereafter injection tube 6 is stopped by a predetermined angle, a curing agent or drug solution is injected in the direction of the predetermined time arrow A 2. [0016] Thereafter repeatedly rotating the injection and, after injection in the direction of arrow A n, where returned in the direction of arrow A l 1
After the completion of the step, the injection tube 6 is pulled out a predetermined distance to start the next step. As described above, by intermittently rotating the injection pipe 6 to perform the injection, the jet effectively cuts the ground 1, and the hardener or the chemical is efficiently and uniformly injected in all directions. As shown in the figure, a columnar underground cured product 11 having small irregularities and almost a columnar shape is formed. Further, the construction time can be shortened, and the consumption of the curing agent and the chemical solution can be reduced. Since the amount of excess injection is reduced, the amount of sludge discharged from the opening of the injection hole 20 is also reduced, and the adverse effect on the environment is also reduced. Table 1 shows a comparison of data obtained when a 1 m long underground cured product is formed by this forming method and data obtained when a 1 m long underground cured product is formed by a conventional forming method. [Table 1] From Table 1, it can be seen that this formation method can form the underground hardened material 11 more efficiently than the conventional formation method. As described above, according to the method of forming an underground cured product of the present invention, a curing agent or a chemical solution is uniformly supplied to form a columnar underground cured product having small irregularities. It is possible to reduce the consumption of the curing agent and the chemical solution.
In addition, the construction time can be shortened, the consumption of the curing agent and the chemical solution is reduced, and the excess injection amount is reduced, so that the amount of sludge discharged from the inlet of the injection hole is reduced, and the adverse effect on the environment is also reduced.
【図面の簡単な説明】
【図１】本発明の実施の一形態を示す地中硬化物の造成
方法に用いられる注入設備の構成図である。
【図２】回転断続装置の構成図である。
【図３】硬化剤の噴射状態の説明図である。
【図４】造成された地中硬化物の水平断面図である。
【図５】造成された地中硬化物の垂直断面図である。
【図６】従来の地中硬化物の造成方法における硬化剤の
噴射状態の説明図である。
【図７】従来の地中硬化物の造成方法で造成された地中
硬化物の水平断面図である。
【図８】従来の地中硬化物の造成方法で造成された地中
硬化物の垂直断面図である。
【符号の説明】
１ 地盤
２ ボーリングマシン
３ 供給プラント
４ ガイドシェル
５ パワースイベル
６ 注入管
７ スイベル
８ 高圧ホース
９ 下方噴射ノズル
１０ 水平方向噴射ノズル
１１ 地中硬化物
１２ 回転断続装置
１３ 分割板
１４ センサ
１５ 検出孔
１６ ケーシング
２０ 注入孔BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an injection facility used for a method of forming an underground cured product according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a rotation interrupting device. FIG. 3 is an explanatory diagram of a state of injection of a curing agent. FIG. 4 is a horizontal sectional view of the formed underground cured product. FIG. 5 is a vertical sectional view of the formed underground cured product. FIG. 6 is an explanatory diagram of a state of injection of a curing agent in a conventional method of forming an underground cured product. FIG. 7 is a horizontal sectional view of an underground cured product created by a conventional method of creating an underground cured product. FIG. 8 is a vertical sectional view of an underground cured product formed by a conventional method of forming an underground cured product. [Description of Signs] 1 Ground 2 Boring Machine 3 Supply Plant 4 Guide Shell 5 Power Swivel 6 Injection Pipe 7 Swivel 8 High Pressure Hose 9 Lower Injection Nozzle 10 Horizontal Injection Nozzle 11 Underground Hardened Material 12 Rotating Intermittent Device 13 Divider 14 Sensor 15 Detection hole 16 Casing 20 Injection hole
Claims (1)
管を地中に挿入し、硬化剤又は薬液を注入管に高圧で供
給して噴射ノズルから噴射させ、注入管を断続的に回転
させると共に、所定距離づつ段階的に引き出すことによ
りコラム状の地中硬化物を造成する地中硬化物の造成方
法。Claims 1. An injection pipe provided with an injection nozzle on a side surface of a tip portion is inserted into the ground, and a curing agent or a chemical is supplied to the injection pipe at a high pressure and injected from the injection nozzle. A method of forming an underground hardened material in which a columnar underground hardened material is formed by intermittently rotating a pipe and pulling out a predetermined distance stepwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002113789A JP3944553B2 (en) | 2002-04-16 | 2002-04-16 | Construction method of underground hardened material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002113789A JP3944553B2 (en) | 2002-04-16 | 2002-04-16 | Construction method of underground hardened material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003306931A true JP2003306931A (en) | 2003-10-31 |
| JP3944553B2 JP3944553B2 (en) | 2007-07-11 |
Family
ID=29395872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002113789A Expired - Lifetime JP3944553B2 (en) | 2002-04-16 | 2002-04-16 | Construction method of underground hardened material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3944553B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130090116A (en) * | 2012-02-03 | 2013-08-13 | (주)지성이씨에스 | Construction method of ground hardening pile and construction apparatus thereof |
| JP2015110873A (en) * | 2013-12-06 | 2015-06-18 | 株式会社不動テトラ | Ground improvement method by high pressure injection and agitation method |
-
2002
- 2002-04-16 JP JP2002113789A patent/JP3944553B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130090116A (en) * | 2012-02-03 | 2013-08-13 | (주)지성이씨에스 | Construction method of ground hardening pile and construction apparatus thereof |
| JP2015110873A (en) * | 2013-12-06 | 2015-06-18 | 株式会社不動テトラ | Ground improvement method by high pressure injection and agitation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3944553B2 (en) | 2007-07-11 |
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