EP0006703B1 - Ground anchor, method of making a ground anchor and corrosion-proof sleeve for use in said method - Google Patents

Ground anchor, method of making a ground anchor and corrosion-proof sleeve for use in said method Download PDF

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Publication number
EP0006703B1
EP0006703B1 EP79301094A EP79301094A EP0006703B1 EP 0006703 B1 EP0006703 B1 EP 0006703B1 EP 79301094 A EP79301094 A EP 79301094A EP 79301094 A EP79301094 A EP 79301094A EP 0006703 B1 EP0006703 B1 EP 0006703B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
anchor
cap
corrosion
self
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
Application number
EP79301094A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0006703A1 (en
Inventor
John Vincent Brown
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.)
Fosroc International Ltd
Original Assignee
Fosroc International 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10498010&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0006703(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Fosroc International Ltd filed Critical Fosroc International Ltd
Priority to AT79301094T priority Critical patent/ATE1554T1/de
Publication of EP0006703A1 publication Critical patent/EP0006703A1/en
Application granted granted Critical
Publication of EP0006703B1 publication Critical patent/EP0006703B1/en
Expired 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
    • E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0013—Protection against corrosion

Definitions

  • the invention concerns ground anchors for use in the civil engineering, construction and mining industries for example. It also concerns a method of making the ground anchor and a corrosion-proof sleeve for use in the method.
  • ground anchors there is a requirement for ground anchors to have at least a double corrosion protection about the central anchor element, such as that provided by a waterproof sleeve which is grouted on to the element.
  • Such anchors are known, see for example United States Patent No. 3 641 772, which discloses an anchor assembly comprising an elongate sealing tube closed at one end and receiving a stressing cable with set material filling the space between the cable and the tube. Such an assembly is made in a workshop remote from the building site with the tube in the vertical position. The assembly is then transported to the site and placed in the bore. The tube is joined to the anchor element in a factory remote from the building site and each anchor must be purpose- built.
  • a ground anchor to be received in a bore in the ground or like substrate, the ground anchor comprising an anchor element formed of a bar, tendon, or the like, the element being surrounded by a corrosion-proof sleeve made of plastics or the like, an annulus of set self-setting composition such as cement being present between the sheath and the element, characterised by
  • the cap is secured to the anchor element by means of the self-setting composition to seal the end of the anchor against ingress of moisture and to protect the leading end of the anchor during insertion into a borehole.
  • the sleeve lengths will usually be connected together such that the sleeve is sealed against escape of self-setting composition during introduction of the composition into the sleeve.
  • the sleeved anchor element is upwardly inclined away from the cap for best escape of air whilst the self-setting composition is supplied into the sleeve.
  • the inlet is preferably located in the side of the cap.
  • the anchor When the anchor is upwardly inclined for introduction of self-setting composition, the inlet is less liable to damage in this location, and the inlet is less likely to become blocked by dirt.
  • the sleeve preferably has at least two corrosion-proof layers. It is especially preferred for the sleeve to comprise three layers, the intermediate layer being of set filler such as a resinous or a cementitious grout and at least one of th 8" other two layers being of plastics. Most preferably the sleeve comprises an outer layer of plastics, an intermediate layer of set filler and an inner layer of metal. The metal inner layer serves to strengthen the sleeve for handling purposes.
  • the anchor element may be a bar having either a plain or a ribbed profile.
  • Plain bars may be used with threaded nuts and plain washers, the nuts being screw-threaded on to a cooperatively threaded end portion of the bar.
  • Ribbed bars do not require the use of a nut and washer, but rely instead upon the ribs to transfer load from the tendon to the sleeve.
  • the method is particularly useful for corrosion proofing strand tendons.
  • Known factory methods require "noding" of each strand to transfer the stress from the strands to- the sleeve. This noding involves removal of a polypropylene coating from the length of the tendon to be corrosion proofed, followed by untwisting of the strands and thorough cleaning off of any grease from the strands. A node is then applied to each strand whereupon the strands are re- twisted and secured inside the sleeve. The nodes serve to lock the strands to the sleeve.
  • the method of the invention When the method of the invention is used to corrosion proof a strand tendon on site, the ptastics sheathing is stripped off the tendon and the tendon surface is wiped free of grease without untwisting the strands. A metal ferrule is then compressed onto the end of the tendon for best transfer of tendon load to the sleeve. The sleeve is then secured to the end portion of the tendon by the method of the invention.
  • the sleeve should have longitudinally spaced apart external circumferential ribs and should be internally threaded to respectively provide a good key between the sleeve and the grout used to secure the element in the hole, and between the sleeve and the self-setting composition which is used to secure the sleeve to the anchor element.
  • the invention includes a ground anchor made by the method, and further includes the sleeve lengths themselves as new items of commerce.
  • the sleeve 1 of Figure 1 comprises an outer tube 2 of plastics, the tube having spaced-apart castellations 3, an inner steel tube 4 having a thread 5, and an intermediate layer of set polyester resin 6. Both ends of the sleeve 1, only one end being shown for convenience in Figure 1, have two diametrically opposite recesses 7. Towards each end of the sleeve, an 0-ring 8 is located about the tube between the castellations 3.
  • a ribbed steel bar 9, Figure 2 to be corrosion proofed for use as a ground anchor, is mounted on a trestle, not shown, at a construction site.
  • a suitable number of sleeve lengths 1 are fitted over one end of the rod 9 in end-to-end relation. For convenience only two sleeve lengths are shown in Figure 2.
  • a connecting tube 10 is fitted over the adjacent 0-rings 8 of adjacent sleeve lengths.
  • An end cap 11 comprising a mouth portion 12 and a side inlet 13, is fitted over the end of the sleeve. The clearance between the mouth 12 of the end cap 11 and the sleeve 1 ts sealed by the adjacent 0- ring 8.
  • a polyester resin grout 14 is then pumped through the inlet 13 of the cap 11 into the annular clearance 15 between the sleeve and the rod.
  • the anchor is upwardly inclined away from the end cap for best escape of air during introduction of the grout.
  • the grout is forced into the clearance between adjacent ends of the sleeve lengths there to provide a moisture-proof seal.
  • the recesses 7 facilitate passage of the grout between the sleeve ends and also act as keys more firmly to secure the sleeve lengths together by means of the grout within the recesses.
  • the inlet 13 is sawn off and the anchor located in a hole in a substrate in known manner.
  • the cap 11 serves as a guide for the anchor and protects the leading end of the anchor during insertion into a hole.
  • the grout within the end cap 11 seals the end of the anchor against penetration of moisture.
  • a strand tendon may be used in place of the rod 9.
  • the tendon is prepared by removing the protective sheath along the length of the tendon to be corrosion proofed. The bared tendon is then thoroughly degreased and a ferrule is compressed on to the end of the tendon. The tendon is then sleeved as described, the ferrule being located within the cap 11.
  • Figure 3 shows an alternative way of joining together adjacent sleeve lengths.
  • the external plastics layer 2 of one sleeve length 1 a has a female extension 16, and the same layer of the adjacent sleeve length 1 b has a male extension 17.
  • the extensions 16, 17 are screw-threaded one into the other.
  • the method of the invention allows corrosion-proof anchors to be made quickly and cheaply on site to meet individual requirements.
  • the sleeve is capable of transferring the maximum load of the anchor element to the borehole grout, provided a sufficient length of sleeve is used.
  • the minimum length of sleeve for full load transfer ranges from 4 m for a 110 mm external diameter sleeve, to 1.5 m for a 65 mm external diameter sleeve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Gloves (AREA)
  • Rock Bolts (AREA)
EP79301094A 1978-06-17 1979-06-08 Ground anchor, method of making a ground anchor and corrosion-proof sleeve for use in said method Expired EP0006703B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79301094T ATE1554T1 (de) 1978-06-17 1979-06-08 Felsanker, verfahren zur herstellung des felsankers und ein in diesem verfahren verwendbares korrosionsgeschuetztes rohr.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7827190 1978-06-17
GB2719078 1978-06-17

Publications (2)

Publication Number Publication Date
EP0006703A1 EP0006703A1 (en) 1980-01-09
EP0006703B1 true EP0006703B1 (en) 1982-09-15

Family

ID=10498010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79301094A Expired EP0006703B1 (en) 1978-06-17 1979-06-08 Ground anchor, method of making a ground anchor and corrosion-proof sleeve for use in said method

Country Status (7)

Country Link
EP (1) EP0006703B1 (ja)
JP (1) JPS557393A (ja)
AT (1) ATE1554T1 (ja)
BR (1) BR7903733A (ja)
DE (1) DE2963669D1 (ja)
ES (1) ES481592A1 (ja)
ZA (1) ZA792992B (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400113A (en) * 1980-06-13 1983-08-23 Ingersol-Rand Company Friction rock stabilizer and a method of isolating the same from a bore surface
JPS58150622A (ja) * 1982-03-01 1983-09-07 Katsumoto Ueda 腐蝕防護アンカ−幹体の注入材の注入方法
JPS60110381A (ja) * 1983-11-20 1985-06-15 Sumitomo Electric Ind Ltd プレストレスアンカーの構造体
JPS63130821A (ja) * 1986-11-20 1988-06-03 Taisei Corp アンカ−ケ−ブルの構造
CH666932A5 (de) * 1987-02-19 1988-08-31 Bau Box Ewiag Zug- oder druckstab zur verbindung zweier betonteile.
JPH0211839U (ja) * 1988-07-06 1990-01-25
WO2012162472A1 (en) 2011-05-26 2012-11-29 Syngenta Participations Ag Stabilized biocontrol water dispersible granules
CN103758549B (zh) * 2014-01-09 2016-09-28 中国矿业大学 一种基于膏体材料的先灌后锚预应力全长锚固支护方法
CN106351220A (zh) * 2016-11-02 2017-01-25 洛阳中岩工程材料有限公司 一种高效率的大直径锚杆连接套
GB2566253A (en) * 2017-07-28 2019-03-13 Shire Structures Ltd Improved foundation pin
WO2024008807A1 (de) 2022-07-08 2024-01-11 Bayer Aktiengesellschaft Feststoff-formulierung insektizider mischungen mit besonders guten dispergiereigenschaften

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641772A (en) * 1970-06-04 1972-02-15 Losinger Ag Rock anchor
DE2039109C3 (de) * 1970-08-06 1978-03-02 Dyckerhoff & Widmann Ag, 8000 Muenchen Verwendung einer Spulmittelleitung mit Austrittsöffnungen zur Begrenzung der Verankerungsstrecke eines Verpreßankers
DE2101236A1 (de) * 1971-01-12 1972-08-17 Bauer, Karlheinz, Dipl.-Ing. Dr.-Ing., 8898 Schrobenhausen Korrosionsgeschützter Zuganker zur Verankerung von Bauteilen im Erdreich sowie Verfahren zur Herstellung von Zugverankerungen mit korrosionsgeschützten Zugankern
GB1382054A (en) * 1971-05-20 1975-01-29 Fosroc Ag Fixing bolts in blind holes
CH585820A5 (ja) * 1974-12-24 1977-03-15 Stump Bohr Ag
DE2511863C3 (de) * 1975-03-18 1980-01-03 Dyckerhoff & Widmann Ag, 8000 Muenchen Korrosionsgeschütztes Zugglied für einen vorgespannten Verpreßanker
FR2335319A1 (fr) * 1975-12-19 1977-07-15 Intrafor Cofor Procede et dispositif d'injection d'un coulis dans une gaine de cable ou de tirant precontraint de grande longueur
DE2624559C2 (de) * 1976-06-01 1985-09-05 Gebirgssicherung GmbH, Salzburg Gebirgsanker
DE2637676A1 (de) * 1976-08-20 1978-02-23 Stump Bohr Gmbh Zuganker
DE2707238C3 (de) * 1977-02-19 1979-07-12 Dyckerhoff & Widmann Ag, 8000 Muenchen Korrosionsgeschütztes Zugglied für einen vorspannbaren Anker im Festgestein
FR2397492A1 (fr) * 1977-07-13 1979-02-09 Soletanche Dispositif d'ancrage dans le sol au moyen d'une armature ou tirant isolee du sol

Also Published As

Publication number Publication date
ES481592A1 (es) 1980-02-16
EP0006703A1 (en) 1980-01-09
ZA792992B (en) 1980-06-25
ATE1554T1 (de) 1982-09-15
DE2963669D1 (en) 1982-11-04
JPS557393A (en) 1980-01-19
BR7903733A (pt) 1980-04-15

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