JP2894223B2 - Adhesion transfer method ground anchor - Google Patents
Adhesion transfer method ground anchorInfo
- Publication number
- JP2894223B2 JP2894223B2 JP28021094A JP28021094A JP2894223B2 JP 2894223 B2 JP2894223 B2 JP 2894223B2 JP 28021094 A JP28021094 A JP 28021094A JP 28021094 A JP28021094 A JP 28021094A JP 2894223 B2 JP2894223 B2 JP 2894223B2
- Authority
- JP
- Japan
- Prior art keywords
- adhesion
- tensile
- ground anchor
- grout material
- anchor
- 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
Landscapes
- Piles And Underground Anchors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は付着伝達方式グラウンド
アンカーの構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an adhesion transmitting type ground anchor.
【０００２】[0002]
【従来の技術】山留め壁や建造物を支持するグラウンド
アンカーは、引張り材に加わる引張り力を引張り材とグ
ラウト材との付着抵抗力によりアンカー定着体に伝達す
る付着伝達方式、引張り材に加わる引張り力を引張り材
先端に取付けた支圧板（耐荷体ともいう）による支圧抵
抗力によりアンカー定着体に伝達する支圧伝達方式、お
よび両者の併用方式に大別される。付着伝達方式におい
ては引張り材をその儘グラウト材中に埋設する方法、お
よび付着抵抗力を増加させるために引張り材の付着長部
全体に補強筋や鋼製またはプラスチック製のシースを巻
いたものをグラウト材中に埋設する方法が知られてい
る。2. Description of the Related Art A ground anchor supporting a retaining wall or a building is an adhesion transmission system in which a tensile force applied to a tensile material is transmitted to an anchor fixing body by an adhesive resistance between the tensile material and a grout material, and a tension applied to the tensile material. It is roughly classified into a bearing transmission system in which the force is transmitted to the anchor fixing member by a bearing resistance force of a bearing plate (also referred to as a load-bearing body) attached to the tip end of the tension member, or a combination of both. In the adhesion transmission method, a method of embedding the tension material as it is in the grout material, and a method in which a reinforcing bar or a steel or plastic sheath is wound around the entire length of the adhesion of the tension material to increase the adhesion resistance A method of embedding in grout material is known.
【０００３】[0003]
【発明が解決しようとする課題】従来の付着伝達方式の
アンカーにおいて、付着抵抗力を増加させようとして引
張り材の付着長部全体に補強筋などを巻くと、付着長部
へのグラウト材の充填性が悪くなり、期待する程付着抵
抗力は向上しない場合がある。In a conventional adhesion transmission type anchor, when a reinforcing bar or the like is wrapped around the entire length of the tension member to increase the adhesion resistance, the grout material is filled in the adhesion portion. In some cases, the adhesiveness is deteriorated and the adhesion resistance is not improved as expected.
【０００４】付着伝達方式のアンカーでは、（１）引張
り力の繰り返し負荷により、まず付着長部上部に付着切
れが発生し、それが順次付着長部下部に伝播して遂には
引張り材の抜け出しが生ずる。（２）大径の引張り材や
複数の引張り材を束ねた場合には、最も大きな引張り応
力が発生する付着長部上部周辺のグラウト材に割裂が発
生し、その割裂が急速に下部に伝播してアンカー支持力
を失う。という現象により、アンカーとしての機能を果
たさなくなる。従って、（１）の現象に対しては付着長
部を長くすることにより対処することが可能であるが、
（２）の現象に対しては付着長部上部周辺のグラウト材
による付着抵抗力を高めて、長時間の大きな引張り力の
負荷に対してもグラウト材に割裂を発生させないように
する必要がある。[0004] In the adhesion transmission type anchor, (1) due to the repetitive load of the tensile force, the adhesion breakage occurs first in the upper portion of the adhesion length portion, and this propagates sequentially to the lower portion of the adhesion length portion, and finally the tensile material comes off. Occurs. (2) When a large-diameter tensile material or a plurality of tensile materials are bundled, a crack is generated in the grout material around the upper part of the attached long part where the largest tensile stress occurs, and the split propagates rapidly to the lower part. Loses anchor support. The phenomenon described above stops the function as an anchor. Therefore, it is possible to cope with the phenomenon (1) by increasing the adhesion length,
With respect to the phenomenon (2), it is necessary to increase the adhesion resistance of the grout material around the upper portion of the adhesion length so that the grout material does not split even under a long-time large tensile load. .
【０００５】[0005]
【課題を解決するための手段】本発明は、引張り材の付
着長部上部に螺旋状に巻き紡錘形に加工した補強鉄筋を
取付けて、グラウト材の割裂の発生を防止するとともに
引張り材とグラウト材との付着性能を向上させてアンカ
ー定着体の引張り抵抗力を高めるグラウンドアンカーの
構造に関するものである。SUMMARY OF THE INVENTION According to the present invention, there is provided a reinforcing rod which is spirally wound into a spindle shape and is attached to an upper portion of an attached length of a tensile material so as to prevent splitting of the grout material and to provide the tensile material and the grout material. The present invention relates to a structure of a ground anchor that improves the adhesion performance of the anchor and improves the tensile resistance of the anchor fixing body.
【０００６】即ち、本発明は、螺旋状に巻き紡錘形に加
工した補強鉄筋を付着長部上部に取付けた引張り材を地
盤内のグラウト材中に埋設してなる付着伝達方式グラウ
ンドアンカーである。That is, the present invention is an adhesion-transmitting ground anchor in which a tension member in which a reinforcing reinforcing bar formed into a spiral shape and processed into a spindle shape is attached to an upper portion of an adhesion long portion is buried in a grout material in the ground.
【０００７】本発明の引張り材としては、ＰＣ鋼棒やＰ
Ｃ鋼撚り線などのＰＣ鋼材の他、繊維強化プラスチック
（ＦＲＰ）製のロッドやストランドが使用される。この
引張り材は、一本をグラウト材（硬化してアンカー定着
体となる）中に埋設してもよいし複数本を束ねて埋設し
てもよい。この引張り材に取付けられ紡錘形補強鉄筋は
直径数mm〜１０mm程度の鉄筋を螺旋状に巻くと同時に紡
錘形に加工して製造され、紡錘形の直径は引張り力の大
きさに対応した大きさとされ、紡錘形補強鉄筋内部への
グラウト材の充填を阻害しない形状とされる。紡錘形補
強鉄筋は、その一端もしくは両端を取付金物を介して引
張り材の外周にかしめ付けて固定される。As the tensile material of the present invention, a PC steel rod or P
Rods and strands made of fiber reinforced plastic (FRP) are used in addition to PC steel such as stranded C steel. One of the tension members may be embedded in a grout material (cured to become an anchor fixing member), or a plurality of the tension members may be bundled and embedded. The spindle-type reinforcing bar attached to this tension member is manufactured by spirally winding a reinforcing bar having a diameter of several mm to 10 mm and simultaneously processing it into a spindle shape. The diameter of the spindle shape is set to a size corresponding to the magnitude of the tensile force, and the spindle shape is The shape does not hinder the filling of the grout material into the reinforcing steel. The spindle-shaped reinforcing steel bar is fixed by caulking one end or both ends thereof to the outer periphery of the tensile member via a fitting.
【０００８】本発明において使用されるグラウト材は、
引張り材を設置後地盤中に注入するセメントミルクやモ
ルタルの硬化体の他、引張り材の設置前に地盤中に注入
あるいは打設したセメントミルクやモルタル、コンクリ
ートなどの硬化体を含むものであり、簡便のため、グラ
ウト材と総称する。グラウト材を引張り材の設置前に地
盤中に注入あるいは打設する場合にはグラウト材の硬化
しないうちに引張り材をグラウト材中に埋設する必要が
あるのは勿論である。[0008] The grout material used in the present invention is:
In addition to the hardened body of cement milk and mortar injected into the ground after installing the tensile material, the hardened body of cement milk, mortar, concrete, etc. injected or poured into the ground before installing the tensile material, For the sake of simplicity, it is collectively called grout material. When the grout material is injected or poured into the ground before the tension material is installed, it is needless to say that the tension material must be embedded in the grout material before the grout material hardens.
【０００９】本発明のグラウンドアンカーでは引張り材
の付着長部上部に紡錘形補強鉄筋が取付けられていて、
その拘束効果によりグラウト材の割裂の発生が防止され
るとともに、引張り材とグラウト材との付着性能が向上
しているので、引張り材の付着長部の長さを短くするこ
とが可能となる。[0009] In the ground anchor of the present invention, a spindle-shaped reinforcing bar is attached to the upper part of the attached length of the tensile material,
The restraining effect prevents the splitting of the grout material and improves the adhesion performance between the tension material and the grout material, so that the length of the adhesion length portion of the tension material can be shortened.
【００１０】[0010]
【実施例】以下、図面を参照しながら本発明の付着伝達
方式グラウンドアンカーの例について説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a ground anchor according to an embodiment of the present invention;
【００１１】図１（ａ）は本発明の付着伝達方式グラウ
ンドアンカーを山留め壁の支持に用いた例の縦断面図で
あり、図１（ｂ）は引張り材に取付けられる紡錘形補強
鉄筋の１例の斜視図である。FIG. 1 (a) is a longitudinal sectional view of an example in which the adhesion transmitting type ground anchor of the present invention is used to support a retaining wall, and FIG. 1 (b) is an example of a spindle type reinforcing steel bar attached to a tension member. It is a perspective view of.
【００１２】図２は、付着伝達方式グラウンドアンカー
の引張り材に発生する引張り応力分布図の一例であり、
本発明のもの（ａ）と従来のもの（ｂ）とを対比して図
示してある。FIG. 2 is an example of a distribution diagram of a tensile stress generated in a tensile material of the ground anchor of the adhesion transmitting method.
The drawing shows a comparison between the present invention (a) and the conventional one (b).
【００１３】図１（ｂ）に示すように、紡錘形補強鉄筋
１は直径数mm〜１０mm程度の鉄筋を螺旋状に巻くと同時
に長さ１m 程度の紡錘形に加工して製造されている。図
１（ａ）に示すように、引張り材２は地表部側のシース
３を被せた自由長部Ｍとアンカー定着体側の付着長部Ｌ
とから構成され、引張り材２の付着長部Ｌの上部の外周
に紡錘形補強鉄筋１が取付けられている。山留め壁５の
構築後、通常のアンカー定着工法に従って地山の削孔、
グラウト材４の注入を行い、グラウト材４が硬化しない
間に引張り材２を削孔に挿入設置する。グラウト材４の
硬化後、引張り材２に緊張力を導入しながら引張り材２
の自由長部Ｍの上端を定着具８、支圧板７、台座６を介
して山留め壁５に固定する。これで山留め壁５は付着伝
達方式グラウンドアンカーで支持される。As shown in FIG. 1 (b), the spindle-shaped reinforcing steel bar 1 is manufactured by spirally winding a reinforcing bar having a diameter of several mm to 10 mm and simultaneously processing it into a spindle shape having a length of about 1 m. As shown in FIG. 1A, the tension member 2 has a free length portion M covered with a sheath 3 on the ground surface side and an attached length portion L on the anchor fixing body side.
The spindle-shaped reinforcing steel bar 1 is attached to the outer periphery of the upper part of the attachment length L of the tension member 2. After the construction of the retaining wall 5, drilling of the ground according to the usual anchor anchoring method,
The grout material 4 is injected, and the tension material 2 is inserted and set in the drilled hole while the grout material 4 is not cured. After the grout material 4 is hardened, the tension material 2 is applied while applying tension to the tension material 2.
Is fixed to the retaining wall 5 via the fixing device 8, the support plate 7, and the pedestal 6. In this way, the retaining wall 5 is supported by the adhesion-transmitting ground anchor.
【００１４】図２（ａ）に示されるように、本発明の構
造のグラウンドアンカーでは引張り力Ｐが増大するにつ
れて引張り材２に発生する引張り応力ｆは当然増大する
が、紡錘形補強鉄筋１取付け部での付着抵抗力が向上し
ているので、紡錘形補強鉄筋１取付け部のみで増加する
引張り力Ｐに抵抗することが可能となり、引張り応力分
布は下方へは余り拡がらない。As shown in FIG. 2 (a), in the ground anchor having the structure of the present invention, the tensile stress f generated in the tensile member 2 naturally increases as the tensile force P increases. Since the adhesion resistance of the reinforcing bar 1 is improved, it becomes possible to resist the increasing tensile force P only at the attachment portion of the spindle-shaped reinforcing bar 1, and the tensile stress distribution does not spread much downward.
【００１５】これに対して、紡錘形補強鉄筋１を取付け
ていない従来のグラウンドアンカーでは引張り力Ｐが増
大するにつれて引張り材２に発生する引張り応力ｆが増
大するとともに、引張り材２の付着長部Ｌの上部のグラ
ウト材の割裂などによる付着力の低下のため、付着長部
Ｌの上部の付着抵抗力では増加する引張り力Ｐに抵抗す
ることができなくなり、引張り力Ｐの増大につれて引張
り応力分布は急速に下方に拡がっていき、付着長部Ｌの
全長でやっと引張り力Ｐに抵抗する状態になる。On the other hand, in the conventional ground anchor to which the spindle type reinforcing bar 1 is not attached, the tensile stress f generated in the tensile member 2 increases as the tensile force P increases, and the length L of the tensile member 2 adheres. Due to the decrease in the adhesive force due to the splitting of the grout material on the upper part of the adhesive, the adhesive resistance at the upper part of the adhesive long part L cannot resist the increasing tensile force P. As the tensile force P increases, the tensile stress distribution becomes It rapidly spreads downward, and finally reaches the state of resisting the tensile force P over the entire length of the attached length L.
【００１６】[0016]
【発明の効果】本発明のグラウンドアンカーでは引張り
材の付着長部上部に紡錘形補強鉄筋が取付けられてい
て、その拘束効果によりグラウト材の割裂の発生が防止
されるとともに、引張り材とグラウト材との付着性能が
向上しているので、引張り材の付着長部の長さを短くす
ることが可能となる。According to the ground anchor of the present invention, a spindle-shaped reinforcing bar is attached to the upper portion of the attached length of the tensile material, and the restraining effect prevents the splitting of the grout material, and also reduces the occurrence of splitting of the grout material. Since the adhesion performance of the tension member is improved, it is possible to shorten the length of the adhesion length portion of the tensile material.
【図１】（ａ）は本発明の付着伝達方式グラウンドアン
カーを山留め壁の支持に用いた例の縦断面図であり、
（ｂ）は引張り材に取付けられる紡錘形補強鉄筋の１例
の斜視図である。FIG. 1A is a longitudinal sectional view of an example in which an adhesion transmitting type ground anchor of the present invention is used for supporting a retaining wall,
(B) is a perspective view of an example of a spindle-shaped reinforcing steel bar attached to a tension member.
【図２】付着伝達方式グラウンドアンカーの引張り材に
発生する引張り応力分布図の一例であり、本発明のもの
（ａ）と従来のもの（ｂ）とを対比して図示してある。FIG. 2 is an example of a distribution diagram of a tensile stress generated in a tensile material of a ground anchor of an adhesion transmitting type, in which (a) according to the present invention and (b) are compared.
【符号の説明】 １・・紡錘形補強鉄筋、２・・引張り材、３・・シー
ス、４・・グラウト材、５・・山留め壁、６・・台座、
７・・支圧板、８・・定着具、Ｐ・・引張り力、ｆ・・
引張り応力、Ｌ・・引張り材の付着長部、Ｍ・・引張り
材の自由長部。[Explanation of Signs] 1. Spindle-shaped reinforcing steel bar, 2. Tension material, 3. Sheath, 4 Grout material, 5 Retaining wall, 6, Pedestal,
7 ··· Support plate, 8 ··· Fixing tool, P ·· Tension force, f ···
Tensile stress, L ... Length of attached tensile material, M..Free length of tensile material.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 5/80 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) E02D 5/80
Claims (1)
を付着長部上部に取付けた引張り材を地盤内のグラウト
材中に埋設してなる付着伝達方式グラウンドアンカー。1. An adhesion-transmitting ground anchor in which a reinforcing material spirally wound into a spindle shape and attached to an upper portion of an attached long portion is embedded in a grout material in the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28021094A JP2894223B2 (en) | 1994-11-15 | 1994-11-15 | Adhesion transfer method ground anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28021094A JP2894223B2 (en) | 1994-11-15 | 1994-11-15 | Adhesion transfer method ground anchor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08134907A JPH08134907A (en) | 1996-05-28 |
| JP2894223B2 true JP2894223B2 (en) | 1999-05-24 |
Family
ID=17621854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28021094A Expired - Fee Related JP2894223B2 (en) | 1994-11-15 | 1994-11-15 | Adhesion transfer method ground anchor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2894223B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101473704B1 (en) * | 2013-08-21 | 2014-12-18 | 화림에이치앤이 주식회사 | Soilnail with spring |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6175791B2 (en) * | 2013-02-14 | 2017-08-09 | ライト工業株式会社 | Ground reinforcement method and structure |
-
1994
- 1994-11-15 JP JP28021094A patent/JP2894223B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101473704B1 (en) * | 2013-08-21 | 2014-12-18 | 화림에이치앤이 주식회사 | Soilnail with spring |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08134907A (en) | 1996-05-28 |
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