JPH06248645A - Construction of ground anchor in hole expanded by high-pressure jet - Google Patents
Construction of ground anchor in hole expanded by high-pressure jetInfo
- Publication number
- JPH06248645A JPH06248645A JP5063195A JP6319593A JPH06248645A JP H06248645 A JPH06248645 A JP H06248645A JP 5063195 A JP5063195 A JP 5063195A JP 6319593 A JP6319593 A JP 6319593A JP H06248645 A JPH06248645 A JP H06248645A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- rod
- drilled hole
- pressure
- pressure water
- 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.)
- Pending
Links
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、高圧ジェットを用い
た拡孔グランドアンカーに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded ground anchor using a high pressure jet.
【０００２】[0002]
【従来の技術】従来の ccpアンカーは、注入ロッド（例
えば、直径40.8mm）のみで削孔し、これに引張鋼材を挿
入してモルタル等を注入することにより固結一体化した
ものが一般的であった。2. Description of the Related Art Conventional ccp anchors are generally formed by drilling only with an injection rod (for example, a diameter of 40.8 mm), inserting a tensile steel material into this hole, and injecting mortar etc. Met.
【０００３】[0003]
【発明が解決しようとする課題】上記従来のアンカーで
は径が長さ方向に一律で断面形が小さく、粘性土層にお
いては周面摩擦力が小さいためグラウドアンカーの設計
に際しては制約が多く、特に長尺アンカー、施工後撤去
する除去アンカーの設計において定着長の設定に問題が
多い。In the above-mentioned conventional anchor, the diameter is uniform in the length direction and the cross-sectional shape is small, and in the cohesive soil layer, the frictional force on the peripheral surface is small, so that there are many restrictions in the design of the grout anchor. There are many problems in setting the anchoring length in the design of long anchors and removal anchors that are removed after construction.
【０００４】また、定着長に比例して耐力が増大しない
欠点がある外、粘性土の通水削孔時に地山表面に脆弱面
が発生して周面摩擦力が減少したり、耐荷体直上部のモ
ルタル柱が破壊するなどの問題があった。Further, in addition to the drawback that the yield strength does not increase in proportion to the fixing length, a fragile surface is generated on the ground surface at the time of water boring of cohesive soil to reduce the peripheral frictional force, There was a problem that the upper mortar column was destroyed.
【０００５】[0005]
【課題を解決するための手段】この発明は前記従来の課
題を解決するために、削孔ロッドにより所定の深さまで
削孔１を行い、この削孔１内に高圧水噴射ロッド２を挿
入してその先端から高圧水を噴射させ、順次引抜きなが
ら周辺地盤を高圧の水ジェットにより切削して拡孔３を
行った後、引張鋼材を削孔１内に挿入してモルタル等の
グラウト４を加圧注入するようにした高圧ジェットを用
いた拡孔グランドアンカーを提案するものである。In order to solve the above-mentioned conventional problems, the present invention drills a hole 1 to a predetermined depth with a drilling rod, and inserts a high-pressure water jet rod 2 into this drilling hole 1. High-pressure water is sprayed from the tip of the drill, and the surrounding ground is cut by a high-pressure water jet while sequentially pulling out to make a hole 3 and then a tensile steel material is inserted into the hole 1 and grout 4 such as mortar is added. We propose a ground-expanded ground anchor using a high-pressure jet with pressure injection.
【０００６】[0006]
【作用】高圧水噴射ロッド２により拡大切削して拡孔３
するので、任意かつ正確な位置に断面形（直径25〜35c
m）の大きい拡孔アンカーを造成できる。[Function] The high-pressure water jet rod 2 is used for expansion cutting to expand the hole 3
So that the cross-section (diameter 25-35c
It is possible to create a hole expansion anchor with a large m).
【０００７】また、粘性土層においては切削表面の脆弱
化を防ぐと共に、大きな周面摩擦力が得られるため、定
着長を短くして充分な引張耐力を保持させることができ
る。Further, in the cohesive soil layer, weakening of the cutting surface is prevented, and a large circumferential frictional force is obtained, so that the fixing length can be shortened and sufficient tensile strength can be maintained.
【０００８】[0008]
【実施例】図１に示すように先ずロータリーパーカッシ
ョン等の削孔ロッドにより所定の深さまで、例えば直径
135mm 等の削孔１を行い、削孔１の先端側の定着部に相
当する部分のケーシングを引き抜く。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, first, a drilling rod such as a rotary percussion is used to reach a predetermined depth, for example, a diameter.
Make a hole 1 such as 135mm, and pull out the casing of the part corresponding to the fixing part on the tip side of the hole 1.
【０００９】削孔１の基端側の自由長部分に位置するケ
ージング内から、例えば直径40.8mm程度のccp 用掘削ロ
ッド等の高圧水噴射ロッド２を定着部先端まで挿入し、
このロッド２の先端から高圧プランジャポンプで周囲に
水またはセメントミルク（周辺地盤に注入して地盤を固
結強化する目的で用いる）などの高圧水（例えば、圧力
200Kgf/cm2）を噴射させ、順次引抜きながら高圧の水ジ
ェットにより削孔１の周辺地盤を切削して拡孔３を行
う。From inside the caging located in the free length portion on the base end side of the drilled hole 1, a high pressure water jet rod 2 such as a ccp drilling rod having a diameter of about 40.8 mm is inserted to the tip of the fixing portion,
From the tip of the rod 2, high-pressure water such as water or cement milk (used for the purpose of injecting into the surrounding ground to strengthen and solidify the ground) by using a high-pressure plunger pump (for example, pressure)
200Kgf / cm2) is sprayed, and while pulling out sequentially, the ground around the drilled hole 1 is cut by a high-pressure water jet to perform the drilled hole 3.
【００１０】この拡孔３は図２，３に示すように一律の
径で拡大切削する場合の外、図４に示すように所定間隔
を置いて断続的に拡大切削するようにしてもよい。As shown in FIGS. 2 and 3, the expanding hole 3 may be enlarged and cut with a uniform diameter, or may be intermittently enlarged and cut at predetermined intervals as shown in FIG.
【００１１】次にロータリーパーカッション等の削孔ロ
ッドを削孔１内の先端まで挿入し、削孔ロッドを介して
削孔内に水を流して排泥しながら削孔１内の清掃を行
う。Next, a drilling rod such as a rotary percussion is inserted up to the tip of the drilling hole 1, and water is poured into the drilling hole through the drilling rod to drain the mud and clean the inside of the drilling hole 1.
【００１２】その後は、引張鋼材を削孔１内に挿入して
モルタル等のグラウト４を定着部における拡孔３または
削孔１内に加圧注入するなどの通常の手順により、アン
カー体を造成する。After that, an anchor body is formed by a usual procedure such as inserting a tensile steel material into the drilled hole 1 and injecting grout 4 such as mortar into the expanded hole 3 or the drilled hole 1 in the fixing portion under pressure. To do.
【００１３】[0013]
【発明の効果】以上の通りこの発明によれば、高圧水噴
射ロッドの高圧の水ジェットにより拡孔するので、任意
かつ正確な位置に断面形（直径25〜35cm程度）の大きい
拡孔アンカーを造成できる。As described above, according to the present invention, since a hole is expanded by the high-pressure water jet of the high-pressure water injection rod, a hole-expansion anchor having a large cross section (diameter of about 25 to 35 cm) can be placed at an arbitrary and accurate position. Can be created.
【００１４】従って、粘性土層において切削表面の脆弱
化を防ぐと共に、大きな周面摩擦力を確保できるため、
定着長を短くして充分な引張耐力を保持させることがで
き、除去アンカーとして構成することが可能となる。Therefore, it is possible to prevent weakening of the cutting surface in the cohesive soil layer and to secure a large peripheral frictional force.
The fixing length can be shortened to maintain a sufficient tensile strength, and the anchor can be configured as a removal anchor.
【図１】この発明の施工工程の一態様を示す縦断正面
図。FIG. 1 is a vertical sectional front view showing one embodiment of a construction process of the present invention.
【図２】この発明の施工工程の他の態様を示す縦断正面
図。FIG. 2 is a vertical sectional front view showing another embodiment of the construction process of the present invention.
【図３】この発明の施工工程のさらに他の態様を示す縦
断正面図。FIG. 3 is a vertical sectional front view showing still another aspect of the construction process of the present invention.
【図４】この発明の他の施工態様を示す縦断正面図。FIG. 4 is a vertical sectional front view showing another construction mode of the present invention.
１ 削孔 ２ 高圧水噴射ロッド ３ 拡孔 ４ グラウト 1 Drilling 2 High-pressure water jet rod 3 Expanding hole 4 Grout
Claims (1)
行い、この削孔内に高圧水噴射ロッドを挿入してその先
端から高圧の水ジェットを噴射させ、順次引抜きながら
周辺地盤を切削して拡孔を行った後、引張鋼材を削孔内
に挿入してモルタル等のグラウトを加圧注入することを
特徴とする高圧ジェットを用いた拡孔グランドアンカー
の施工方法。1. A drilling rod is drilled to a predetermined depth, a high-pressure water jet rod is inserted into the drilled hole, and a high-pressure water jet is jetted from the tip of the rod. A method of constructing a ground anchor using a high-pressure jet, characterized in that a tensile steel material is inserted into the drilled hole and grout such as mortar is injected under pressure after the hole is expanded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5063195A JPH06248645A (en) | 1993-02-26 | 1993-02-26 | Construction of ground anchor in hole expanded by high-pressure jet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5063195A JPH06248645A (en) | 1993-02-26 | 1993-02-26 | Construction of ground anchor in hole expanded by high-pressure jet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06248645A true JPH06248645A (en) | 1994-09-06 |
Family
ID=13222203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5063195A Pending JPH06248645A (en) | 1993-02-26 | 1993-02-26 | Construction of ground anchor in hole expanded by high-pressure jet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06248645A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004018781A1 (en) * | 2002-08-23 | 2004-03-04 | Soilex Ab | A method of making a pile or an earth anchor |
| KR100729661B1 (en) * | 2005-09-23 | 2007-06-18 | 주식회사 에스에스씨컨설턴트 | Construction method for soil improvement anchor system |
| DE102020131395A1 (en) | 2020-11-26 | 2022-06-02 | Depenbrock Ingenieurwasserbau GmbH & Co. KG | Method of securing a structure and placement of a structure on a site |
-
1993
- 1993-02-26 JP JP5063195A patent/JPH06248645A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004018781A1 (en) * | 2002-08-23 | 2004-03-04 | Soilex Ab | A method of making a pile or an earth anchor |
| KR100729661B1 (en) * | 2005-09-23 | 2007-06-18 | 주식회사 에스에스씨컨설턴트 | Construction method for soil improvement anchor system |
| DE102020131395A1 (en) | 2020-11-26 | 2022-06-02 | Depenbrock Ingenieurwasserbau GmbH & Co. KG | Method of securing a structure and placement of a structure on a site |
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