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DSI UK  ›  Products  ›  Geotechnical Systems  ›  GEWI®-Piles  ›  System
The DYWIDAG GEWI® Pile is a drilled micropile with a steel core made of GEWI® Bar with hot-rolled, continuous thread deformations on both sides, the coarse GEWI® Thread. The steel core is sheathed by cement grout which acts both as corrosion protection and load transfer into the soil or rock.
GEWI® Pile

GEWI® Pile

Advantages and Characteristics

  • robust coarse thread remains threadable even when dirty or damaged
  • can be cut off and spliced at any given point
  • excellent load transfer into concrete structures by means of anchoring elements
  • a small drill hole diameter allows economic drilling equipment
  • tensile, compression and alternating loads can be transferred to the same extent
  • the coarse GEWI® Thread guarantees maximum bond between steel and cement grout
  • the stress-strain curve of the GEWI® Bar shows high ductility
  • continuing settlements can be stopped by preloaded GEWI® Piles
  • load transfer into the soil is optimized by the post-grouting system
  • Double Corrosion Protected Piles can be used in aggressive media such as seawater or water leaking from dump sites

The GEWI® Pile system is also very suitable to be used as Micropiles. The GEWI®-Coupler Splice allows splicing of the GEWI® Bar at any point and the reconnection of the micropiles to piles as long as necessary.

Standard Corrosion Protection

 

Double Corrosion Protection

The GEWI® Bar at the core of the pile is normally sheathed by an at least 20 mm thick cement grout layer. The high pH-value of the cement grout surrounds the steel with an alkaline medium which passivates the steel surface. The Standard Corrosion Protection is durable for compressive loads. For tensile loads, the GEWI® Bar in a corrugated sheathing is injected at the shop. The Double Corrosion Protected GEWI® Pile can be installed as easily as the GEWI® Pile with Standard Corrosion Protection. The Pile load is transferred into the unterground over the full length through the ribs of the corrugated by the exterior cement grout.

GEWI® Pile with single corrosion protection

 

GEWI® Pile with double corrosion protection

GEWI® Pile with single corrosion protection
1-

additional reinforcement for compression pile

2-

end-anchorage with lock nut

3-

pile neck reinforcment

4-

spacer

5-

coupler

6-

GEWI® bar

GEWI® Pile with double corrosion protection
1-

nut with plate and lock nut

2-

additional reinforcement for tension pile

3-

corrugated sheathing

4-

spacer

5-

cement grout

size of standard diameters
GEWI ® Pile with Standard Corrosion ProtectionGEWI ® Pile with Double Corrosion Protection
bar
diameter
upper pilepile shank without spacerpile shank without spacer
plastic corrugated sheathinghelixreinforcing cagewithout splicewith torqued splicewith contact splicewithout splicewith splice
[mm][mm][mm][mm][mm][mm][mm][mm][mm]
Ø 325677663658555660
Ø 406585744570706574
Ø 508095845693868094
Ø 63,510011310769125110100>=111
 
Technical Data of the GEWI® Pile
type Øcross-
sectional area
steel gradeyield loadultimate load
[mm][mm2] [kN][kN]
32804BSt 500 S402442
401257BSt 500 S628691
501963BSt 500 S9821080
63,63167S 555/70017582217
 
GEWI® Multibar Pile
type Øcross-
sectional area
yield loadultimate load
[mm][mm2][kN][kN]
3x322,4121,2061,327
1x40, 1x503,2201,6101,771
3x403,7701,8852,074
2x503,9271,9632,160
2x40, 1x504,4772,2382,462
1x40, 2x505,1842,5922,851
3x505,8902,9453,240
 
Technical Data of the GEWI® Plus Pile
type Øcross-
sectional area
steel gradeyield loadultimate load
[mm][mm2] [kN][kN]
30707S 670/800474565
35962S 670/800645770
431452S 670/8009731162
57.52597S 670/80017402077
63.53167S 670/80021222534
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