Temporary Bar anchorswith completely removable tendon

in accordance with DIN 4125 and EN 1537

Technical data

nominal bar diameter steel grade yield load ultimate load diameter of compression tube[mm] [kN] [kN] [mm]

26.5 525 580 10032.0 Y1050H 760 850 10036.0 (St 950/1050) 960 1.070 10040.0 acc. EN 10138 1.190 1.320 11047.0 1.648 1.822 110

System description

the anchor is a compression tube anchor

the anchor load is transferred via an unbonded steeltendon down to the bottom of the borehole, and from there via the compression tube and the grout into the ground

in contrast to other systems, no components of the high grade steel that remain in the ground after removalcould be obstacles for excavators or TBMs after their service time

A high removal rate is guaranteed through easyunscrewing of the threadbar out of its foot anchorage inconjunction with the coarse DYWIDAG threadform

Components

Anchor head and tendon in accordance with German general approval Z-20.1-17

Plastic sheathing around the tendon guarantees thebars removability

Foot anchorage, to transfer the anchor load into the compression tube

Compression tube, consisting of 20 cm long and highlybrittle segments, with predetermined breaking points

Installation of the anchors

Installation into cased or non-cased sheathing

diameter of compression tube has to be considered for choice of drilling equipment

Limitation of grouting pressure of max. 10 bars foranchors 26.5 mm to 40 mm

Pressureless gravity grouting of the boreholes for anchors 47 mm

A screwability check can be carried out a few hoursafter the grouting procedure. This guarantees an almost100% removability rate, as anchors with non-turnablebars can be drilled out immediately

Acceptance test in accordance with DIN 4125 or EN 1537

Stressing up to lock-off load

Consideration of a sufficient bar protrusion, to enable unstressing before removal

Removal

Unstressing of anchors

Removal of the anchor head

Easy unscrewing of the threadbar out of the foot anchorage

Pulling out of the high grade tendon out of the borehole

Situation after removal

After the removal of the high grade tendon, only theplastic sheathing and the short and brittle cast iron tubesegments with their pre-determined breaking pointsremain in the ground. They are no obstacles for furtherunderground works ( e.g. for excavators or TBMs).

Planning and design

Bond length in accordance with geotechnicalcalculation

Typical compression tube length: 1.4 to 2.4 m

Plate anchorage on concrete in accordance withGerman general approval Z-20.1-17

Anchorage on steel according to steel designguidelines

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Construction EuropeDYWIDAG SYSTEMS INTERNATIONAL GmbHSiemensstrae 885716 UnterschleiheimTel. +49 89 309050 - 100Fax +49 89 309050 - 170www.dywidag-systems.comPlease note: This brochure serves basic information purposes only. Technical data and information provided herein shall be considered non-binding and may be subject to change without notice. We do not assume any liability for losses or damages attributed to the use of this technical data and any improper use of our products. Should you require further information on particular products, please do not hesitate to contact us.

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