EP0807717A1 - Rod material for earth anchor and method of using the same - Google Patents

Rod material for earth anchor and method of using the same Download PDF

Info

Publication number
EP0807717A1
EP0807717A1 EP96901503A EP96901503A EP0807717A1 EP 0807717 A1 EP0807717 A1 EP 0807717A1 EP 96901503 A EP96901503 A EP 96901503A EP 96901503 A EP96901503 A EP 96901503A EP 0807717 A1 EP0807717 A1 EP 0807717A1
Authority
EP
European Patent Office
Prior art keywords
reinforcing member
rod
cover film
grout
frp
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.)
Withdrawn
Application number
EP96901503A
Other languages
German (de)
English (en)
French (fr)
Inventor
Junji Hosokawa
Masao Kikuchi
Akira Sumitani
Haruhito Akimoto
Shuji Shimozono
Manabu Sotooka
Nobuyuki Ozawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Plastics Industry Co Ltd
Komatsu Ltd
Original Assignee
Komatsu Plastics Industry Co Ltd
Komatsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Komatsu Plastics Industry Co Ltd, Komatsu Ltd filed Critical Komatsu Plastics Industry Co Ltd
Publication of EP0807717A1 publication Critical patent/EP0807717A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors

Definitions

  • the present invention relates to a reinforcing member having a fixing portion against grout used in earth anchoring methods such as ground anchoring method, earth reinforcing method and NATM method, and more particularly, to a reinforcing member composed of FRP and a method of using the reinforcing member.
  • FRP reinforcement a reinforcing member composed of FRP (herein after referred to as "FRP reinforcement") which is excellent in corrosion resistance has started to be used in place of a steel member (hereinafter referred to as "PC steel member”.
  • PC steel member a steel member
  • this FRP reinforcement has been used as a reinforcing member for earth anchoring methods such as ground anchoring or the like.
  • the reinforcing member to be used for the ground anchoring method comprises a front fixing portion to be fixed in ground by grout (for example, concrete), an anchor free length portion as an intermediate portion of the member and an anchor head portion to which a frame structure is fixed at the ground surface by an anchor nut or the like.
  • grout for example, concrete
  • the front fixing portion is required to be firmly bonded to the grout and the anchor free length portion is required to have both corrosion resistance and non-adhesive property against the grout.
  • the anchor free length portion of the reinforcing member is covered with a smooth sheath.
  • the FRP reinforcement is used in place of the covered PC steel member, there is not posed a problem of corrosion resistance.
  • the reinforcement is executed in such a manner that the smooth sheath is provided to the anchor free length portion under present circumstances.
  • an edge-separation for separating the anchor free length portion from the fixing portion is performed, for example, by winding a non-adhesive tape (vinyl tape) around the anchor free length portion.
  • each FRP reinforcement for the earth anchoring method is required to be provided with the smooth sheath at the intermediate portion as the anchor free length portion. Therefore, the construction of the FRP reinforcement will become complicated.
  • each of the FRP reinforcement for the earth anchoring method is required to be manufactured one by one at a factory, and a mass-production of the FRP reinforcement was difficult.
  • each of the vinyl tapes is required to be carefully or minutely wound around the free length portion by a handwork, so that the winding operation would become remarkably troublesome or complicated at a construction site.
  • the present invention is achieved for solving the aforementioned problems and an object of the present invention is to provide a reinforcing member for an earth anchoring method and a method of using the reinforcing member which is not required to provide a smooth sheath or tape for imparting non-adhesive property against grout to the anchor free length portion and capable of easily imparting an adhesive property against the grout to only a front fixing portion of the member at the construction site.
  • the reinforcing member for an earth anchoring method according to the present invention is constructed such that a rod, which is composed of FRP and has a surface on which irregularities are formed, is covered with a cover film.
  • the reinforcing member for an earth anchoring method is constructed such that a string body such as tape or the like is wound in a spiral shape around a surface of a rod composed of FRP so that a surface of the string body is almost flush with the surface of the rod.
  • a non-fixing portion from which the cover film or string body is not peeled acts such that the cover film or the string body is dissolved or gelled through a reaction with the grout so as to form a void space having a thickness corresponding to that of the cover film or the string body, the void space being formed between the reinforcing member and the grout. Therefore, a non-adhesive property between the reinforcing member and the grout can be further improved.
  • a reference numeral 1 denotes a reinforcing member.
  • the reinforcing member 1 has a construction comprising a rod 2 composed of FRP and a tubular cover film 3 formed of a resin for covering the rod 2.
  • irregularities 4 are formed on a surface of the rod 2 in overall length.
  • the cover film 3 formed to the front portion requiring a sufficient adhesion strength is peeled off in a desired length by means of a cutter or the like.
  • the portion from which the cover film 3 is peeled off performs as a front fixing portion 5, while the remaining portion performs as the anchor free length portion 6.
  • the reinforcing member 1 is cut in a desired length.
  • an anchor head portion (not shown) is formed at another end portion, i.e., an end portion of the anchor free length portion side of the member.
  • the thus formed reinforcing member 1 is inserted with its front fixing portion into an anchor box or hole formed in an anchoring ground. Thereafter, the grout is injected into the anchor box and then cured.
  • the grout is injected into whole of the anchor box and the reinforcing member 1 contacts to the grout at full length of the anchor length portion.
  • the top fixing portion 5 from which the cover film 3 is removed is bonded to the grout, thereby to be firmly fixed to the ground side.
  • the cover film 3 is interposed between the reinforcing member 1 and the grout, the reinforcing member 1 and the grout are remained in a non-bonded state, so that the frictional resistance against the cured grout hardly occur.
  • the cover film 3 attains a substitute function alternative to that of the smooth sheath used in the prior art.
  • inorganic fibers such as carbon fiber, glass fiber, or organic fibers such as aramid fiber or the like are preferably used.
  • matrix resin thermo-setting resins such as epoxy resin, unsaturated polyester resin, phenolic resin, vinyl ester or the like, and thermoplastic resins such as nylon, polyester or the like are preferably used.
  • the material constituting the cover film 3 is not limited as far as the materials can be easily peeled off from FRP. In particular, it is preferable to use the material having an extremely small shearing strength or a large extension under a small stressed condition.
  • the material in addition to soft vinyl chloride, polyethylene, polypropylene, nylon or the like, rubber and elastomer are also generally used. However, the material is not limited to these ones.
  • the material having a small friction resistance is preferable.
  • Such examples may include polyethylene, polypropylene, polyacetal, fluorine resin, silicon resin or the like. However, the materials are not limited to these ones.
  • the cover film 3 As a material for constituting the cover film 3, it is preferable to use materials that contact and react with the uncured grout so as to be dissolved or to form a gelatine-like swelling-gel. In this case, during a time when the grout injected into the anchor box is cured, the cover film 3 is dissolved or swelling-gelled so as to form a void space between the rod 2 and the cured grout. Therefore, the friction resistance against the grout at the anchor free length portion 6 can be eliminated.
  • the materials for the cover film 3 may include crosslinked polyacrylamide, acrylic acid or the like.
  • the concrete which is one example of the material for the grout has strong alkaline property
  • the material for the cover film 3 there can also be used a material in a form of non-woven fabric cloth bonded to the rod 2 through an adhesion agent which is soluble into water contained in the concrete.
  • the covering operation of the cover film 3 onto the rod 2 is performed in accordance with well-known methods such as coating a material in a molten state onto the rod or inserting the rod into a tubular member on the way of forming the rod 2 or after the completion of the rod forming.
  • FIGs. 1 and 2 respectively show an example of the reinforcing member which is formed in a manner such that the rod 2 is formed by winding a tape 11 around the surface of the rod so as to form irregularities 4 thereon, and a tubular cover film 3 is covered on the rod 2.
  • the rod 2 is formed by winding a tape 11 around the surface of the rod so as to form irregularities 4 thereon, and a tubular cover film 3 is covered on the rod 2.
  • a part of the cover film 3 ranging 100mm from the top end of thus formed reinforcing member 1 was peeled off to thereby prepare two samples of A and B . Then, as shown in FIG. 3, a mortar body 15 having a diameter of 100 mm was bonded to only a portion of one sample of A from which the cover film 3 had been peeled off. While, as shown in FIG. 4, regarding the other sample of B , a mortar body 16 having a diameter of 100 mm was bonded to a portion in a total length of 300 mm including the portion of the cover film 3 having been peeled off and a portion adjacent to the peeled portion.
  • a reinforcing member comprising a rod 2 having the irregularities thereon and the cover film 3 covering the rod 2.
  • the cover film 3 is provided in order to lower the friction resistance against the grout. Therefore, if the surface of the rod 2 per se as a small friction resistance against the grout, the cover film 3 will not be required.
  • FIG. 5 shows an example of such structure, in which, in order to form a helical or spiral groove, the tape which had been wound around the rod 2 at the time of forming the rod 2 remains as it is even after the rod 2 has been cured. Then, the surface of the rod 2 is smoothly finished so that the surface of the rod 2 provides a small friction coefficient.
  • the thus formed reinforcing member 1 is cut in a desired length. Thereafter, as shown in FIG. 6, the tape 11 wound around the front fixing portion 5 is peeled off to thereby form a spiral groove 4a on the peeled portion.
  • the tape 11 wound around a portion except the front fixing portion 5 remains as it is, so that the friction resistance of the remaining portion against the grout can be reduced.
  • the specifications of the rod portion are the same as those of aforementioned example.
  • the reinforcing member 1 for the earth anchoring method has a construction comprising a rod 2 composed of FRP and having irregularities formed thereon and a cover film 3 covered around the rod 2. Due to this construction, when the cover film 3 is peeled off in a desired length, only such peeled portion can perform a function as a fixing portion for bonding to the grout, while the remaining portion covered with the cover film 3 performs a function as a non-fixing portion against the grout.
  • the construction of the reinforcing member for the earth anchoring method having both the fixing portion and non-fixing portion against the grout can be remarkably simplified without requiring a smooth sheath or a partially tape-winding.
  • the rod 2 is composed of FRP, the reinforcing member is free from a problem of corrosion.
  • the reinforcing member 1 has a construction comprising a rod 2 composed of FRP and a string body such as tape 11 or the like for forming irregularities on a surface of the rod 2, the string body being spirally wound around the surface of the FRP rod 2 so that a surface of the string body is almost flush with the surface of the rod 2, then the string body is peeled off in a desired length, the peeled portion can perform a function as a fixing portion against the grout. Accordingly, the construction of the reinforcing member 1 requiring both the fixing portion and non-fixing portion can be simplified.
  • cover film 3 and the string body are composed of a material which is dissolved or gelled through the reaction with an uncured grout, it becomes unnecessary to peel off the cover film 3 and the string body, whereby the reinforcing member can be easily available.
  • the aforementioned reinforcing member 1 can be manufactured in accordance with the same procedures as those of the ordinary reinforcing member composed of FRP.
  • the reinforcing member 1 when the cover film 3 or the string body is removed, the removed portion can perform as a fixing portion against the grout. Therefore, an adhesive property against the grout can be easily imparted to only the front fixing portion of the member even at the construction site, whereby the reinforcing member can be easily executed or applied.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Wire Processing (AREA)
EP96901503A 1995-01-31 1996-01-31 Rod material for earth anchor and method of using the same Withdrawn EP0807717A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP13963/95 1995-01-31
JP1396395A JPH08209692A (ja) 1995-01-31 1995-01-31 アースアンカ工法用の筋材及びその製造方法と使用方法
PCT/JP1996/000192 WO1996023934A1 (fr) 1995-01-31 1996-01-31 Materiau en barre pour ancre a terre et son procede d'utilisation

Publications (1)

Publication Number Publication Date
EP0807717A1 true EP0807717A1 (en) 1997-11-19

Family

ID=11847874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96901503A Withdrawn EP0807717A1 (en) 1995-01-31 1996-01-31 Rod material for earth anchor and method of using the same

Country Status (5)

Country Link
EP (1) EP0807717A1 (ja)
JP (1) JPH08209692A (ja)
CA (1) CA2210172A1 (ja)
NO (1) NO973518L (ja)
WO (1) WO1996023934A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340144A (en) * 1998-08-06 2000-02-16 Keller Ltd Ground anchorage
WO2001040582A1 (en) * 1999-12-03 2001-06-07 Keller Limited Slope stabilising means

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003227135A (ja) * 2002-02-01 2003-08-15 Nisshoku Corp 引張材

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429521A (en) * 1987-07-25 1989-01-31 Shimizu Construction Co Ltd Ground anchor and its fixing device
JPH04353117A (ja) * 1991-05-29 1992-12-08 Zenitakagumi:Kk ワイヤアンカー体及びアンカー工法
JP2876056B2 (ja) * 1991-08-02 1999-03-31 株式会社銭高組 新素材地盤永久アンカー
JP2538737B2 (ja) * 1992-04-03 1996-10-02 株式会社銭高組 グランドアンカ―のスペ―サ、及び新素材グランドアンカ―のスペ―サ、及び新素材グランドアンカ―の構造、及び新素材グランドアンカ―の施工方法
JP3116095B2 (ja) * 1992-10-01 2000-12-11 株式会社銭高組 新素材グラウンドアンカーの施工方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9623934A1 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340144A (en) * 1998-08-06 2000-02-16 Keller Ltd Ground anchorage
WO2000008264A1 (en) * 1998-08-06 2000-02-17 Keller Ltd Ground anchorage
GB2340144B (en) * 1998-08-06 2000-06-28 Keller Ltd Ground anchorage
US6571518B1 (en) 1998-08-06 2003-06-03 Anthony Donald Barley Ground anchorage
WO2001040582A1 (en) * 1999-12-03 2001-06-07 Keller Limited Slope stabilising means
US6719498B2 (en) 1999-12-03 2004-04-13 Keller Limited Slope stabilizer

Also Published As

Publication number Publication date
CA2210172A1 (en) 1996-08-08
JPH08209692A (ja) 1996-08-13
NO973518L (no) 1997-09-23
NO973518D0 (no) 1997-07-30
WO1996023934A1 (fr) 1996-08-08

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