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Tie Bar Connections

When detailing how tie rods connect to the retaining wall it is important to consider the effect of fill settlement upon the tie bar and any installation tolerances that may occur. Anker Schroeder recommend that where possible all tie bar connections have the capability to articulate, particularly those to the structure.

Tie Bar Connections to Sheet Pile

Forces are transferred from the sheet pile to the anchor bar through waling sections that run the length of the wall. At the front wall these are normally placed behind the wall (i.e. earth side) and at the anchor wall the non-bearing side.

Steel Z-pile with spherical nut (articulated)

Tie bar connection to inside of pile pan
Sheet pile loads are transferred to the waling via waling bolts, then to the tie bar by a spherical bearing plate and nut. The connec- tion is placed inside the pan giving greater corrosion protection.

Tie bar connection to outside of pile pan
Sheet pile loads are transferred directly to the tie bar. This has the advantage that less waling bolts are req-
uired, but the anchor connection is placed outside the wall in the aggressive corrosion zone.

Tie bar to anchor wall connection
Tie bar forces are transferred directly to the anchor wall via the waling. Generally waling bolts are not required.

Steel U-pile with spherical nut (articulated)

Anchor connection to inside of pile pan
Sheet pile loads are transferred to the waling via waling bolts, then to the tie bar by a spherical bearing plate and nut. The connection is placed inside the pan giving greater corrosion protection.   

Anchor connection to outside of pile pan
Sheet pile loads are transferred directly to the tie bar. This has the advantage that less waling bolts are req-
uired, but the tie bar head connection is placed outside the wall in the aggressive corrosion zone.

Anchor wall connection
Tie bar forces are transferred directly to the anchor wall via the waling. Generally waling bolts are not required.

Tie Rod Connections to high modulus piles

Anchor forces are generally high and articulated connections are recommended to minimize bending at the connection. Articulation can be provided that allows movement in the vertical direction or in all directions.

Tie Rod to Steel tube pile (articulated)

Combi wall – cast-in forged eye tie bar
A short tie bar with a forged eye bar is cast into the tube transferring forces to the centre of the tube. The main tie bars are attached to the cast-in bar via link plates allowing articulation in the vertical direction.

Combi wall cast-in T-Plate
A fabricated T-Plate is cast into the tube transferring forces to the centre of the tube. Forged eye tie bars are attached to the T-connector via a pin allowing articulation in the vertical direction.

Combi & D-wall cast-in spherical connector
A machined ‘spherical connector is cast into the tube transferring forces to the centre of the tube.  Forged spherical anchor bars are connected to the box  allowing articulation in both the vertical & horizontal directions.

Tie Rod Connections to concrete Walls

Alignment between the front wall and anchor wall connection points is critical. Simple articulated tie bar connections allow easy casting into the wall without difficult interruption to formwork and allow easy tie bar connection once the wall has cured. Articulated joints are strongly recommended to aid installation. Tie bar connections available are the same as for steel tubes above.

HZ-M-pile connections (articulated)

HZ-M wall tension plates
Machined and factory welded tension plates are placed either side of the HZ-M web and passed through burnt holes in the flange. Forces are transferred from the transition radius of the HZ-M to the forged eye tie bar through a pin connection and articulation in the vertical plane is possible.

Double HZ-M wall tension beam
A factory welded tension beam is placed bearing on HZ-M flanges close to the web and tension plates passed through burnt holes in the flange. Forces are transferred to the tie bar through a pin connection and articulation in the vertical plane is possible.