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DSI Canada  ›  Products  ›  Geotechnical Systems  ›  DYWIDAG THREADBAR® Anchors  ›  Anchor Design
THREADBAR® Anchors

THREADBAR® Anchors

Anchor Design

The spacing, inclination, length and the load applied of each anchor depend on the local soil or rock conditions. The available drilling equipment and the structural capacity of the other support elements, such as wales, lagging or a concrete retaining wall, may dictate the capacity and configuration of anchors. A factor of safety of 1.5 to 2.5 should be utilized in anchor design.


For rock anchors, the shear stress on the rock socket perimeter is used to size the bond length. For soil anchors, the bond length is generally assumed on the basis of experience and site testing. Field testing should always be conducted to verify design assumptions

Pull out tests verify that the bond capacity of the THREADBAR® in grout exceeds the recommendations of ACI 318. The THREADBAR® grout interface does not control the bond length. Bond in cohesive soils can be considerably increased using the DYWIDAG Postgrouting System.


The stressing length depends on the assumed failure plane and/or the size of the rock or soil mass necessary to resist the anchor force. A minimum stressing length of 15 ft. is recommended so that small movements in the retaining system will not result in a major loss of prestress force.

DYWIDAG Anchor Installation

Selection of the drilling method depends on the number of anchors, the composition of the soil or rock, availability of equipment and the required diameter of the hole. The selection of the tools and techniques should be left to the discretion of the drilling contractor where practical. The depth of the bore hole should be based on sit tests. The diameter of the bore hole should exceed the maximum diameter of the anchor by at least 1. If centering devices are used, larger holes are required.

DYWIDAG Anchor Installation

Grouting

For rock anchors, bore holes should be pressure tested to determine water leakage before the anchors are installed. Consolidation grouting, redrilling and retesting are required where water seepage is excessive. After the anchor is installed in the bore hole, the bond length is grouted. Rock anchors and anchors in cohesive soils are generally grouted without pressure. Soil anchors in loose granular material are pressure grouted while the drill casing or auger is withdrawn. DYWIDAG Postgrouting may be used for the installation of anchors in cohesive soils and non-cohesive soils. This technique permits additional grouting operations after the primary grout has cured. Using a series of valves in a preplaced grout pipe, grout can repeatedly be injected under high pressure. Regrouting displaces the previously injected grout and increases the anchor capacity.

Stressing

In stressing, an electrically powered hydraulic jack with built-in socket wrench tightens the anchor nut. The jack fits over a pull rod designed to thread onto the THREADBAR® extension protruding from the anchor nut. Elongation of the anchor can be measured directly or can be monitored by a counter on the jack. Hydraulic pressure is measured by a gauge on the hydraulic pump. Discrepancies of more than 10 % between elongation and gauge reading should be investigated. Lift off reading should be taken to determine the applied prestress force. Movement of the structural system must be considered.

Testing

Prior to the installation of any production anchors, test anchors should be installed to verify all design assumptions, including anchor length. Test anchors should be proof stressed to 80 % of the guaranteed ultimate strength of the DYWIDAG Threadbar. After 24 or more hours, readings may be required on selected anchors to determine creep behavior. All production anchors should also be proof stressed, but the load need not be held for an extended period.

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Israel

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EVEN GEV Ltd.

Emanuel Building 31 Ha' Barzel Str. Ramat Ha'Hayal Tel Aviv 69710 Israel
Phone: +972-77-501 00 56
Fax: +972-77-501 00 57
eMail: simcha@evengev.com

Construction / Geotechnical Systems

Geotechnics
Lipsker & Co Engineering Services (1975) Ltd.

24 Trumpeldor St. 47 264 Ramat Hasharon Israel
Phone: +972-354-955 57
Fax: +972-354-946 90
eMail: eng@lipsker.co.il
Web: www.lipsker.co.il

Bahrain

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Qatar Australian Construction Systems W.L.L.

Al Thumama, new Compound, Street No 911, Villa no 56 - 17, Area no 46 E Ring road, Near to Electric Office P.O. Box 24893 Doha / Qatar
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Construction

DYWIDAG-Systems International Far East Ltd.

Unit 905-907 9/F, Prosperity Millennia Plaza 663 King’s Road North Point Hong Kong
Phone: +852-28-33 19 13
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Egypt

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MISR DYWIDAG

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Phone: +20-2-37 61 48 69
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PT DELTA SYSTECH INDONESIA

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Japan

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SUMITOMO (SEI) STEEL WIRE CORP.

PC Technical Department 1-3-13 Motoakasaka, Minato-ku, Tokyo 107-0051 Japan
Phone: +81-3-64 06 28 12
Fax: +81-3-64 06 40 36
Web: www.sei-ssw.co.jp

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SUMITOMO (SEI) STEEL WIRE CORP.

PC Technical Department 1-1-1, Koya-kita Itami, Hyogo, 664-0016 Japan
Phone: +81-72-771 05 08
Fax: +81-72-771 05 02

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SUMITOMO ELECTRIC INDUSTRIES LTD.

Sales Department Special Steel Wire Division 1-1-1, Koya-kita Itami, Hyogo, 664-0016 Japan
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Korea

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DYWIDAG-Systems Korea Co. Ltd.

5th Floor, Spring Morning B/D 8, Mabang-ro, Seocho-gu Seoul 137-894 Korea
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eMail: dywidagkor@gmail.com
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SOPREL Liban SAL

Liban Cable Street Halate Lebanon
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P.O. Box 234085 Dubai U.A.E.
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Qatar

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Qatar Australian Construction Systems W.L.L.

Al Thumama, new Compound, Street No 911, Villa no 56 - 17, Area no 46 E Ring road, Near to Electric Office P.O. Box 24893 Doha / Qatar
Phone: +974-44-58 04 11
Fax: +974-44-69 61 89
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UTRACON STRUCTURAL SYSTEMS PTE LTD

7 E Pioneer Sector 1 Singapore 628446
Phone: +65-64-15 30 78
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DYWITECH Co. Ltd.

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DYWIDAG-Systems International

P.O. Box 234085 Dubai U.A.E.
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D-Tech Postten Co., Ltd.

91/22 Suwinthawong road Minburi district, Minburi Bangkok 10510 Thailand
Phone: +66-2543-77 61
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Basler & Hofmann Singapore Pte Ltd

175A Bencoolen Street #09-01 Burlington Square Singapore 189650
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Malaysia

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D-Tech Postten Co., Ltd.

91/22 Suwinthawong road Minburi district, Minburi Bangkok 10510 Thailand
Phone: +66-2543-77 61
Fax: +66-2543-77 60

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Basler & Hofmann Singapore Pte Ltd

175A Bencoolen Street #09-01 Burlington Square Singapore 189650
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Fax: +65-63-34 30 63
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PRESS-KON

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Finland

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TENSICON OY

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Fax: +358-9-350 59 910
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Lithuania

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Delta Nova

Užupio g. 30 LT-01203 Vilnius Lithuania
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Fax: +370-5272-10 62
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Luxembourg

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DYWIDAG-Systems International N.V.

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Phone: +32-16-60 77 60
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Greece

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HELLENPLAN

4 K. A. Dimitriou Street Spata 19004 Greece
Phone: +30-210-663 57 86
Fax: +30-210-751 21 68
eMail: vtsio@tee.gr

Construction / Post-Tensioning Systems

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Kostantinos Zervas

34th Sintagmatos Pezikon 5 Pireas TK 18532 Athens Greece
Phone: +30-213-0227 363
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eMail: kzervas@tee.gr

Portugal

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DYWIDAG SISTEMAS CONSTRUCTIVOS, SA

Rua D. Manuel I, n.º24 A Quinta da Parreirinha 2695-003 Bobadela (Loures) Portugal
Phone: +351-21-892 28 90
Fax: +351-21-892 28 99
eMail: dywidag@dywidag-sistemas.com

Turkey

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DIVIGER Yapi Teknoloji A.S.

Yildiz Posta Cad. Ayildiz Sitesi 30/15 34349 Istanbul-Gayrettepe Turkey
Phone: +90-212-234 56 12
Fax: +90-212-347 39 49
eMail: diviger@diviger.com

Netherlands

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DYWIDAG-Systems International B.V.

Veilingweg 2 5301 KM Zaltbommel Netherlands
Phone: +31-418-57 89 22
Fax: +31-418-51 30 12
eMail: email.nl@dywidag-systems.com
Web: www.dywidag-systems.com

Norway

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Dywidag Norge AS

Norvald Strands veg 21 2206 Kongsvinger Norway
Phone: +47-62-88 86 80
eMail: adm@dywidag-norge.no

Slovakia

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Doprastav, a.s.

Závod Prefa Drieňová 31 821 01 Bratislava Slovakia
Phone: +421-2-48 271 130
Fax: +421-2-48 271 600
eMail: ivana.biel@doprastav.sk

Switzerland

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SpannStahl AG

Industriegebiet Waesseristr. 29 8340 Hinwil/ZH Switzerland
Phone: +41-44-9 38 97 97
Fax: +41-44-9 38 97 90
eMail: info@spannstahl.ch
Web: www.spannstahl.ch

Croatia / Bosnia & Herzegovina

Construction

PRESS-KON

Obala Hrvatskog narodnog preporoda 6 21000 Split Croatia
Phone: +385-21-34 27 66
Fax: +385-21-34 25 95
eMail: info@dywidag-systems.com
Web: www.dywidag-systems.com

Belgium

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DYWIDAG-Systems International N.V.

Philipssite 5, bus 15 Ubicenter 3001 Leuven Belgium
Phone: +32-16-60 77 60
Fax: +32-16-60 77 66
eMail: info.be@dywidag-systems.com

Construction

DYWIDAG-Systems International

P.O. Box 234085 Dubai U.A.E.
Phone: +971-5555.00275
eMail: shemi.ps@dywidag-systems.com

EMEA

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EMEA

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Germany

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DYWIDAG-Systems International GmbH

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DYWIDAG-Systems International GmbH
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DYWIDAG-Systems International
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Form Tie Systems

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United Kingdom

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DYWIDAG-Systems International Ltd.

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France

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Concrete Accessories

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Concrete Accessories

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Concrete Accessories

Idéaplast

Z.A. Les Montagnes
16430 Champniers
France

Phone +33-5-45 94 71 16

Construction

DSI-ARTEON SAS

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Spain

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DYWIDAG SISTEMAS CONSTRUCTIVOS, S. A.

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Austria

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DYWIDAG-Systems International GmbH

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DYWIT S.P.A

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DYWIDAG-SYSTEMS INTERNATIONAL Sp. z o.o.

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