JP2842772B2 - Ground anchor using aramid fiber reinforced plastic - Google Patents
Ground anchor using aramid fiber reinforced plasticInfo
- Publication number
- JP2842772B2 JP2842772B2 JP5262347A JP26234793A JP2842772B2 JP 2842772 B2 JP2842772 B2 JP 2842772B2 JP 5262347 A JP5262347 A JP 5262347A JP 26234793 A JP26234793 A JP 26234793A JP 2842772 B2 JP2842772 B2 JP 2842772B2
- Authority
- JP
- Japan
- Prior art keywords
- afrp
- anchor
- tensile
- aramid fiber
- fiber reinforced
- 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 - Lifetime
Links
Landscapes
- Piles And Underground Anchors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明はＡＦＲＰを引張材とし
て使用したグラウンドアンカーである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground anchor using AFRP as a tensile member.
【０００２】[0002]
【発明が解決しようとする課題】従来の、グラウンドア
ンカーの引張材として使用されてきたＰＣ鋼より線やＰ
Ｃ鋼棒は、腐食し易く、耐久性に問題があった。地中に
削孔して設置されるグラウンドアンカーは常に腐食環境
下に置かれるために、鋼製の引張材では常に腐食が心配
される。そのために特に永久アンカーとして用いる場合
には、特殊な防錆処置を施すことが原則とされている。
また、引張型のアンカーの場合、定着部グラウトに引張
力が生じ、グラウトにテンションクラックが発生して引
張材が腐食する危険性があった。そこで、定着部にもコ
ルゲートシースなどを装置して、引張材の腐食防止を行
なっている。これら防錆処置のために削孔径が過大に必
要となる。SUMMARY OF THE INVENTION Conventionally, a PC steel stranded wire or P steel used as a tensile material for a ground anchor has been used.
The C steel rod was easily corroded and had a problem in durability. Since ground anchors that are drilled and installed in the ground are always placed in a corrosive environment, corrosion is always a concern with steel tensile members. Therefore, in particular, when used as a permanent anchor, it is a principle to perform a special rust prevention treatment.
Further, in the case of the tension type anchor, there is a risk that a tensile force is generated in the grout at the fixing portion, a tension crack is generated in the grout, and the tensile material is corroded. Therefore, a corrugated sheath or the like is also provided in the fixing section to prevent corrosion of the tensile member. Excessive drilling diameters are required for these rust prevention treatments.
【０００３】この発明は、前記従来の課題を解決するた
めになされたもので、引張材に高強度で化学的安定性に
優れ、腐食の心配のないＡＦＲＰを用い、引張型アンカ
ーの定着性能を改善したものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and uses a high tensile strength, excellent chemical stability, and corrosion-free AFRP as a tensile material to improve the anchoring performance of a tensile anchor. It is an improvement.
【０００４】[0004]
【課題を解決するための手段】ＡＦＲＰの棒材またはス
トランドを引張材に用いるとともに、所定の間隔を保持
して並列に並べた複数本の前記引張材を一群として、ア
ンカー定着部グラウトと十分な付着力を持ち、外周面に
ネジ切りが施してある一本の円筒形外筒管に挿入し、前
記外筒管の内部に無収縮モルタルを充填して、複数本の
前記引張材の先端を一体として一本の外筒管に付着定着
した副定着体をアンカー体定着部先端に形成してあるこ
とを特徴とする。ここで、ＡＦＲＰの棒材とはアラミド
繊維で強化したプラスチックを一本の棒の形に成形した
ものを言い、ＡＦＲＰのストランドとはアラミド繊維で
強化したプラスチックの比較的小径の棒状体を数本撚り
合わせて一本のロープ状としたものを言う。棒材は剛直
で可撓性が乏しく、ストランドは棒材に比べて若干可撓
性に富む。（以下、簡単のために、ＡＦＲＰの棒材とＡ
ＦＲＰのストランドを合わせてＡＦＲＰ材と言う。）A bar or strand of AFRP is used as a tension member, and a plurality of the tension members arranged in parallel while maintaining a predetermined interval are formed as a group, and a sufficient amount of the anchor fixing portion grout is formed. It has an adhesive force, is inserted into a single cylindrical outer tube with a thread cut on the outer peripheral surface, fills the inside of the outer tube with non-shrinkable mortar, A sub-fixing member adhered and fixed to one outer tube is integrally formed at the tip of the anchor fixing portion. Here, the rod material of AFRP refers to a material obtained by molding plastic reinforced with aramid fiber into a single rod, and the strand of AFRP refers to several rods of relatively small diameter made of plastic reinforced with aramid fiber. It is a rope that is twisted together. The rod is rigid and poor in flexibility, and the strand is slightly more flexible than the rod. (Hereinafter, for simplicity, the AFRP bar and A
The FRP strands together are referred to as AFRP material. )
【０００５】[0005]
【実施例】図１、図２、図３は、この発明に係るＡＦＲ
Ｐ材を引張材に用いたグラウンドアンカーの実施例を示
したものである。図１はアンカーの全体構造を示したも
の。図２は定着部先端に取り付けた副定着体の構造を示
したものである。1, 2 and 3 show an AFR according to the present invention.
1 shows an embodiment of a ground anchor using P material as a tensile material. Figure 1 shows the overall structure of the anchor. FIG. 2 shows the structure of the sub-fixing member attached to the tip of the fixing unit.
【０００６】図２、図３において、符号１は引張材であ
るＡＦＲＰ材であり、９本のＡＦＲＰ材１がスペーサー
３によって所定の間隔を保って並列に揃えられている。
また、符号６は、９本一群のＡＦＲＰ材の先端に装着さ
れた外筒管で、一群のＡＦＲＰ材を挿入したのち無収縮
モルタル７を注入固着して副定着体（サブ定着体）を形
成する。In FIG. 2 and FIG. 3, reference numeral 1 denotes an AFRP material as a tensile material, and nine AFRP materials 1 are arranged in parallel at a predetermined interval by a spacer 3.
Reference numeral 6 denotes an outer tube attached to the end of a group of nine AFRP materials. A non-shrinkable mortar 7 is injected and fixed after forming a group of AFRP materials to form a sub-fixed body (sub-fixed body). I do.
【０００７】外筒管６は鋼製の円筒管で外周面には、ア
ンカー定着部グラウトとの付着を良くするために、外周
全面にネジ切りが施してある。[0007] The outer tube 6 is a steel cylindrical tube, and its outer surface is threaded on the entire outer surface in order to improve adhesion to the anchor fixing portion grout.
【０００８】上記実施例では外筒管に鋼製の円筒管を用
いているが、ＦＲＰ製の円筒管を用いることもできる。
また、外筒管と引張材とを固着する充填材には無収縮モ
ルタル７以外の固着材の使用も考えられるが、無収縮モ
ルタル７が最適である。８は止水材、９は圧着バンド、
１０は発泡止水材である。In the above embodiment, a steel cylindrical tube is used as the outer tube, but an FRP cylindrical tube can also be used.
As a filler for fixing the outer tube and the tensile member, a fixing material other than the non-shrink mortar 7 may be used, but the non-shrink mortar 7 is most suitable. 8 is a waterproof material, 9 is a crimp band,
Reference numeral 10 denotes a foam waterproofing material.
【０００９】図４に、試験施工により得られたＡＦＲＰ
材とＰＣ鋼より線を引張材に用いた引張型グラウンドア
ンカーにおける引張材のひずみ分布図を示す。図中、横
軸にはアンカー端部からの距離、縦軸にはひずみ量を示
してある。そしてアンカー端部から５．０ｍまでが定着
部であり、それ以上が自由長部でアンカー長は約１２．
０ｍである。この図において、ＡＦＲＰ材を引張材に用
いた場合、定着部での引張材のひずみが定着部先端にま
で進行している。したがって、ＡＦＲＰ材を引張材に用
いた引張型のアンカーにおいては引張材が抜ける可能性
を示唆するものである。これは、ＡＦＲＰ材の弾性率が
鋼材の１／４と小さいことに起因する。ＰＣ鋼より線を
用いた場合には、引張材のひずみは先端部にまでは達し
ておらず健全に定着されている。FIG. 4 shows AFRP obtained by the test construction.
FIG. 3 shows a strain distribution diagram of a tensile material in a tensile type ground anchor using a material and a PC steel strand as a tensile material. In the figure, the horizontal axis shows the distance from the anchor end, and the vertical axis shows the amount of strain. The anchoring portion extends from the end of the anchor to 5.0 m, the free length extends beyond that, and the anchor length is about 12.
0 m. In this figure, when the AFRP material is used as the tensile material, the strain of the tensile material in the fixing unit has advanced to the tip of the fixing unit. Therefore, in the tension type anchor using the AFRP material as the tensile member, it indicates that the tensile member may come off. This is due to the fact that the elastic modulus of the AFRP material is as small as 1/4 that of the steel material. When a PC steel strand was used, the strain of the tensile material did not reach the tip but was fixed soundly.
【００１０】図５は、この発明による引張材であるＡＦ
ＲＰ材のアンカー定着部におけるひずみの分布を模式的
に示したもので、副定着体内でＡＦＲＰ材のひずみは完
全にゼロに収斂する。FIG. 5 shows a tension member AF according to the present invention.
FIG. 4 schematically shows the distribution of strain in the anchor fixing portion of the RP material, and the strain of the AFRP material converges completely to zero in the sub-fixing body.
【００１１】副定着体は、アンカー体を組立て加工する
際に同時に施工する。The sub-fixing member is installed at the same time when the anchor member is assembled and processed.
【００１２】ＡＦＲＰ材は軽量であるため、ＡＦＲＰ材
を引張材とするアンカー体を削孔内に挿入する際、地下
水がある場合には浮力により浮き上がる。定着を確保す
るための副定着体の長さは４０cmあれば十分であるが、
副定着体は浮き上り防止のための錘りの役割も同時に果
たしており、浮力とのバランスを考えて副定着体長は４
０cmより長く設定することもある。[0012] Since the AFRP material is lightweight, when an anchor body made of the AFRP material as a tensile material is inserted into a drilled hole, if there is groundwater, it floats due to buoyancy. Although the length of the sub-fixing body for securing the fixing is 40 cm, it is sufficient.
The sub-fixing member also plays a role of a weight for preventing floating, and the length of the sub-fixing member is 4 in consideration of balance with buoyancy.
It may be set longer than 0 cm.
【００１３】[0013]
【発明の効果】この発明は以上のようであり、次のよう
な効果を発揮する。As described above, the present invention has the following effects.
【００１４】引張材にＡＦＲＰ材を用いているため腐
食の心配はなく永久アンカーとして用いる場合も特別な
防錆処置を必要としない。Since the AFRP material is used as the tensile material, there is no need to worry about corrosion and no special rust prevention treatment is required even when the material is used as a permanent anchor.
【００１５】ＡＦＲＰ材を引張型アンカーの引張材に
用い、定着部先端に十分な付着力をもたらす外筒管と無
収縮モルタルとにより形成される副定着体を形成するこ
とによりＡＦＲＰ材を引張型アンカーの引張材として用
いることを可能にした。[0015] The AFRP material is used as a tension member of the tension type anchor, and a sub-fixing member formed of an outer cylinder tube and a non-shrink mortar which provides a sufficient adhesive force to the tip of the fixing portion is formed. This makes it possible to use it as a tensile material for anchors.
【００１６】ＡＦＲＰ材は軽量な材料であるが、アン
カー体挿入時の浮力による浮き上りを先端に形成した副
定着体が錘りの役目を果たして防止することができる。The AFRP material is a lightweight material, but the auxiliary fixing body formed at the tip can prevent floating due to buoyancy when the anchor body is inserted by playing the role of the weight.
【図１】ＡＦＲＰ材を用いた引張型グラウンドアンカー
の断面図である。FIG. 1 is a cross-sectional view of a tension type ground anchor using an AFRP material.
【図２】副定着体の詳細断面図である。FIG. 2 is a detailed sectional view of a sub-fixing member.
【図３】副定着体の横断面図である。FIG. 3 is a cross-sectional view of a sub-fixing member.
【図４】ＡＦＲＰ材とＰＣ鋼より線を引張材に用いた場
合の引張型アンカーの引張材のひずみ分布図である。FIG. 4 is a strain distribution diagram of a tensile member of a tensile anchor when an AFRP material and a PC stranded wire are used as the tensile member.
【図５】本発明のＡＦＲＰ材である引張材の定着部での
ひずみ分布の模式図である。FIG. 5 is a schematic diagram of a strain distribution in a fixing portion of a tensile material as an AFRP material of the present invention.
１…ＡＦＲＰ材、２…自由長部シース、３…スペーサ
ー、４…止水部、５…アンカーヘッド、６…外筒管、７
…無収縮モルタル。DESCRIPTION OF SYMBOLS 1 ... AFRP material, 2 ... Free length sheath, 3 ... Spacer, 4 ... Water blocking part, 5 ... Anchor head, 6 ... Outer tube, 7
... non-shrink mortar.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−353117（ＪＰ，Ａ) 特開 平３−290521（ＪＰ，Ａ) 特開 平２−13629（ＪＰ，Ａ) 実開 平２−13639（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 5/80──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-353117 (JP, A) JP-A-3-290521 (JP, A) JP-A-2-13629 (JP, A) 13639 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) E02D 5/80
Claims (1)
「ＡＦＲＰ］と略称する。）の棒材またはストランドを
引張材に用いるとともに、所定の間隔を保持して並列に
並べた複数本の前記引張材を一群として、アンカー定着
部グラウトと十分な付着力を持ち、外周面にネジ切りが
施してある一本の円筒形外筒管に挿入し、前記外筒管の
内部に無収縮モルタルを充填して、複数本の前記引張材
の先端を一体として一本の外筒管に付着定着した副定着
体をアンカー体定着部先端に形成してあることを特徴と
するＡＦＲＰを用いたグラウンドアンカー。An aramid fiber reinforced plastic (hereinafter referred to as “aramid fiber reinforced plastic”)
Abbreviated as "AFRP") as a tension member, and a plurality of the tension members arranged in parallel while maintaining a predetermined interval as a group to have a sufficient adhesive force with the anchor fixing portion grout. Have, and inserted into one cylindrical outer tube with an outer peripheral surface threaded, filling the inside of the outer tube with non-shrinkable mortar, integrally the tips of the plurality of tensile members A ground anchor using AFRP, wherein a sub-fixing member adhered and fixed to one outer tube is formed at the tip of an anchor fixing portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5262347A JP2842772B2 (en) | 1993-10-20 | 1993-10-20 | Ground anchor using aramid fiber reinforced plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5262347A JP2842772B2 (en) | 1993-10-20 | 1993-10-20 | Ground anchor using aramid fiber reinforced plastic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07113232A JPH07113232A (en) | 1995-05-02 |
| JP2842772B2 true JP2842772B2 (en) | 1999-01-06 |
Family
ID=17374488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5262347A Expired - Lifetime JP2842772B2 (en) | 1993-10-20 | 1993-10-20 | Ground anchor using aramid fiber reinforced plastic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2842772B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6163380B2 (en) * | 2013-08-06 | 2017-07-12 | 積水化学工業株式会社 | Fixing structure of tension member and tensile force transmission member, ground anchor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0730809Y2 (en) * | 1988-07-12 | 1995-07-19 | 鹿島建設株式会社 | Fixing tool for fiber-reinforced tendons |
| JPH04353117A (en) * | 1991-05-29 | 1992-12-08 | Zenitakagumi:Kk | Wire anchor body and anchoring method |
-
1993
- 1993-10-20 JP JP5262347A patent/JP2842772B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07113232A (en) | 1995-05-02 |
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