Atlas Copco MAI Systems® SDA®

MAI® - SDA® Anker (Self Drilling Hollow Core Anchor)

A Hollow Core Anchor system as self drilling rock bolt for tunnelling in accordance with DIN 21521

The Atlas Copco MAI® Self-Drilling Anchoris a unique anchoring system and is today’sanswer to the increasing demands of thetunnelling industry and ground engineering for safer and faster production.The system provides advantages for all areas of itsapplications, where boreholes would require thetime consuming drilling with casing systems inunconsolidated or cohesive soil.

Features and Advantages• Particulary suitable for difficult ground conditions.• A high rate of installation since drilling, placing and grouting can be performed in one single operation.• Self drilling system eliminates the requirement for a cased borehole.• Installation with simultaneous drilling and grouting possible.• Suitable for working in limited space, height and in areas of difficult access.• Simple post grouting system. • Easy installation in all directions, also upwards • Hot-dipped galvanizing for corrosion protection

Applications• Slope stabilization• Micro injection pile• Temporary support anchor

SPECIFICATIONS

TECHNICAL DATA T 76N T 76SOutside diameter..............................................76 mm...................76 mm

Internal diameter, average................................51 mm.................. 45 mm

External diameter, effective............................. 76 mm.................. 76 mm

Effective cross sectional area, average............ 1835 mm2............. 2400 mm2

Ultimate load capacity...................................... 1600 kN................ 1900 kN

Yield load capacity............................................ 1200 kN................ 1500 kN

Average tensile strength, Rm...........................880 N/mm2........... 790 N/mm2

Average yield strength, Rp0,2.......................... 660 N/mm2........... 630 N/mm2

Weight.............................................................. 15.0 kg/m.............. 19.7 kg/m

GENERAL DATA

Type of steel............................................. EN 10083-1

Thread type...............................................T76. MAI*

* = Factory standard

Atlas Copco Rock Reinforcement

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ANCHOR COUPLING T76

6.46.4

200200

9595

T76N&ST76N&S gal.

Diam.mm

Lengthmm

Part number Kg Type

Machined steel coupling with patented middle stopMachined steel coupling with patented middle stop hot dip galvanized

98991506469899700325

NG TypeNG Type

ANCHOR PLATE T76

26.926.9

Dimensionmm

Thicknessmm

KgPart number Hole diam.mm

T76N&ST76N&S gal.

Cold deformed with patented geometryCold deformed with patented geometry

250 x 250250 x 250

98991510479899700327

4040

8080

DRILL BIT T76 Description Kg TypePart number

T76/Ø130/EXT76/Ø120/ESS-FT76/Ø175/XX

989970005498991509439899152281

6.04.66.0

EX TypeESS TypeXX Type

Hardened cross drill bit for medium to dense soil and soft rock.Button Drill Bit with TC-inserts. For medium to hard rock formationsStepped cross drill bit for soft soils

T76

XX TypeEX Type

Hammer

Shank adapter Adapter coupling Anchor rod Anchor coupling Anchor rod Bit

Locking function

NUT T76

100100

8080

3.63.6

98991506459899700326

Key sizemm

Lengthmm

Part number Kg

T76N&ST76N&S gal.

Machined steel nutMachined steel nut hot dip galvanized

ESS-F Type

ANCHOR ROD T76

7676

5145

7676

18352400

16001900

12001500

880790

660630

15.019.7

2 2

Outsidediameter

Averageinternal

diameter

Effectiveexternaldiameter

Aver. effcross

sectional area

Ultimate loadcapacity

Yield loadcapacity

Averagetensile

strength Rm

Averageyield strength

Rp0,2Weight

mm mm mm mm kN kN N/mmN/mm kg/m

T76NT76S

T76NT76ST76N gal.T76S gal.

Part number

1 meter long 2 meter long 3 meter long 4 meter long 6 meter long

9899150754989915110198997003189899700322

9899150644989915110298997003199899700323

9899150650989915110398997003209899700324

9899150651989915110498997003219899700202

98991506529899151105

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Competence Rock Center Reinforcement