1. Part 75-1D
Piles, steel-core piles and micropiles Static test loadings II/2013, modified 10/ (Part 75-1, PP 2007, animation+p/r : compr.)
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2. End-bearing with pile tip on a rock surface
Typical underpinning solution in Sweden – Bjurström micropile (displacement pile)
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3. End-bearing with pile tip on a rock surface
Modified by TNa Bjurström micropile (friction type to the left) and conventional (end bearing to the right)
End-bearing and by friction along the shaft
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4. Bjurström micropile as underpinning solution in Sweden
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Bjurström micropile as underpinning solution in Sweden

5. Steel-core piles for underpinning (replacement pile, grouted in-situ, permanent casing required)
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6. Rapport 97
End-bearing or end-bearing and by friction along the shaft within rock socket (alt. in soil along drill casing)
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7. Casing is left in the ground
Steel-core piles
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8. ready
Rapport 97

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Rapport 97

10. Rotary – percussive drilling = pulling force + rotation + percussion
Rotary drilling = pulling force + rotation
Pulling force = thrust or advanced in English
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11. ODEX principles (rotary /percussive drilling)
reamer ring
drill bit
ODEX principles (rotary /percussive drilling)
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12. “Mixed drilling” (in soil and rock) for ODEX and TUBEX
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13. Top hammer (to the left) and Down-The Hole-Hammer (DTH) to the right
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14. ODEX for Down-The Hole-Hammer (DTH) – casing shoe
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15. ODEX G2 for Down-The Hole-Hammer (DTH)
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ODEX G for Down-The Hole-Hammer (DTH)

16. ΔS Odex Symmetrix Odex less air …
backfill
backfill ΔS
clay (with stones and boulders)
clay
coarse sand, gravels and rock rubble
Odex
rock
Difficult soil conditions for drilling (Stockholm)
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17. press
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18. ready

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20. ECCENTRIC vs. ROBIT® concentric drilling
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21. Elemex, Symmetrix, ROBIT and IBEX drilling system NO-X
OD = Rotary percussive drilling method with centric drill bit and percussed rotating casing with button bits + =
Elemex, Symmetrix, ROBIT and IBEX drilling system NO-X
= Rotary percussive drilling method with rotating centric drill bit and percussed none rotating casing with button bits
ODEX and TUBEX = Rotary percussive drilling method with eccentric reamer separately rotating to drill bit and percussed but none rotating casing without button bits
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22. Elemex, Symmetrix, ROBIT and IBEX drilling system NO-X
ODEX and TUBEX = Rotary percussive drilling method with eccentric reamer separately rotating to drill bit and percussed none rotating casing without button bits
Elemex, Symmetrix, ROBIT and IBEX drilling system NO-X
= Rotary percussive drilling method with rotating centric drill bit and percussed none rotating casing with button bits
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23. press
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Drilling components

24. Drilling components – cont.
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Drilling components – cont.
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25. press
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26. press
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Starting stage for drilling: pilot bit mounted on the Down-The Hole-Hammer (DTH) during inserting into the casing
Pilot bit mounted on the Down-The Hole-Hammer (DTH) after inserting into the casing – ready for drilling

27. press
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28. Casing and casing shoe is left in the ground
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Withdrawal of the pilot bit mounted on the Down-The Hole-Hammer (DTH) from the casing
Pilot bit mounted on the Down-The Hole-Hammer (DTH) disconnected from the casing shoe
Drilling principles for piling into the rock

29. press
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30. ready

31. Casing is removed but casing shoe is left in the ground
(piling in solid, stable rock)
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Casing drilled to the designed final depth
Drilling for piling in the rock

32. Casing is removed but casing shoe is left in the ground
(piling in none stable rock)
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Drilling for piling in the rock – grouting and simultaneous withdrawal of casing (option)
Drilling for piling in the rock – inserting of steel core
The pile is completed

33. Ring bit and integrated casing shoe for the Down-The Hole-Hammer (DTH)
Percussed none rotating casing with button bits with inserted the Down-The Hole-Hammer (DTH)
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Ring bit and integrated casing shoe for the Down-The Hole-Hammer (DTH)
Percussed none rotating casing with button bits
Drilling with Robit method in soil
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34. Coupling of drill pipes (rods) for the Down-The Hole-Hammer (DTH)
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Drilling in the soil with the Down-The Hole-Hammer (DTH) and air flush

35. Large diameter steel-core piles for Symmetrix
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Large diameter steel-core piles for Symmetrix

36. Robit DTH drilling for steel-core piles at Torsgränd in Stockholm
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37. Thank You for Your attention!
THE END of Part 75-1D
Thank You for Your attention!
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38. Welcome to www.najder.se
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