1. Micropiles and self drilling rods in soil and rock engineering
Part 10-2aa
Micropiles and self drilling rods
in soil and rock engineering
V-2009 (rev. XI-2012)
(Part 10-2aa, PP 2007, animation+p/r : compr.)
Copyright notice Unauthorised copying of this presentation as whole or in parts in any form or by any means, electronic, photocopying, recording or otherwise, without prior written permision is prohibited.
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2. Example 2: underpinning of cathedral
in Koszalin (Poland)
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3. Location of the project
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4. Köslin (today Koszalin) before “rendez-vous” with Soviet Army in 1945
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Köslin (today Koszalin) before “rendez-vous” with Soviet Army in 1945

5. Köslin before “rendez-vous” with Soviet Army in 1945
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6. Köslin (today Koszalin) in 1945
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Köslin (today Koszalin) in 1945

7. excavation for catristy Underpinning system with TITAN micropiles
cathedral
excavation for catristy
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Underpinning system with TITAN micropiles

8. Excavation for catristy
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9. new underground catristy
the cathedral
new underground catristy
Underpinning system of the cathedral
before excavation for new underground catristy – plan
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10. TITAN – micropiles, anchors and soil nails.
Rotary or rotary - ”light percussive” drilling methods
(”slow and low pressure jet-grouting”)
Example of self-drilling rods
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11. TITAN self-drilling rods with sacrificial drill bits
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12. final shape of grouted pile body
cement grout
final shape of grouted pile body
drill rod = pile shaft
drill bit
cuttings
soil
TITAN micropile
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13. performed by Najder engineering (2004)
anchoring plate
pile shaft
D = 1,54 ddrill
TITAN micropile
performed by Najder engineering (2004)
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14. press
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15. Load transmission to new micropiles – longitudinal concrete beams
cellar
street
excavation
stones
(grouted)
concrete beam
steel bar
concrete beam
micropile
micropile
prestressing forces
press
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16. Underpinning system of the cathedral
before excavation for new underground catristy – cross-section
press
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17. Shoring system – “Berlin wall” (details)
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18. Lowest part of the brick wall and existing foundation of the cathedral
after local excavation
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19. Drilling of Titan micropiles outside the cathedral
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20. Underpinning system of the cathedral foundation
longitudinal concrete beam
prestressed bar inside the plastic casing
grouting hose for corrosion protection of the prestressed bar
Underpinning system of the cathedral foundation
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21. top plate on Titan micropile Titan micropile – details
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22. Underpinning system of the cathedral foundation – cont.
longitudinal beam
prestressed bar inside the plastic casing
Underpinning system of the cathedral foundation – cont.
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23. longitudinal
concrete beam
prestressed bar
Underpinning system of the cathedral foundation – prestressing of GWS bars
press
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24. top plate on Titan micropile
grouting hose for corrosion protection of the prestressed bar
prestressed bar inside the plastic casing
top plate on Titan micropile
Titan micropile
Underpinning system of the cathedral foundation (interior of the church)
press
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25. new underground catristy
the cathedral
new underground catristy
Underpinning system of the cathedral
before excavation for new underground catristy – plan
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26. Secant-pile-wall by Titan micropiles
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27. Excavation for the catristy (shoring system of modified “Berlin wall”)
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28. Final construction works at the catristy
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29. “Catacombs” almost ready

30. The same place in 2011 (11 years later)
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31. Thank You for Your attention!
THE END
Thank You for Your attention!
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32. Welcome to www.najder.se
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33. This works had nothing to do with…
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