Sheet pile anchoring

Sheet pile walls are used as vertical or slightly inclined partitions between areas of different levels, often as quay walls , on bridges as e.g. B. erected wing walls or shoring of construction pits . As a rule, you are stressed significantly more from one side than from the other. If these loads exceed a certain size, it becomes uneconomical or impossible to transfer the forcesinto the subsoil by integrating / clamping the sheet piles / sheet pile profiles at the base of the sheet pile wall, since the driving depth and the material thickness of the sheet pile wall increase exponentially with the free wall height. The static system of the cantilever arm quickly reaches its limits here due to the high loads caused by ground pressure. This is why horizontal or inclined sheet pile anchors are used in a single layer below the sheet pile head or in several layers. The static system of the girder on two or more supports is used, which can absorb loads much better.

Anchor types

There are many different types and designs of sheet pile anchors. A distinction is made between horizontal or slightly inclined anchors on the rear anchor walls at a sufficient distance (calculation of the deep sliding joint), obliquely driven or drilled piles, which are usually anchored back by cement or concrete injections. With a cofferdam , which is built into the water as a quay tongue, the two walls can be anchored against each other. As a rule, round steel anchors are used for this .

Anchor fastening

The anchor rods can be attached to the sheet pile wall in different ways. One possibility is the individual connection of each sheet pile. More often, a chord consisting of two U-profiles, which are welded together via spacers, is attached to the sheet pile wall. This rigid component also serves to align the wall. The anchorages can be screwed to this belt using plates and nuts. Because of the large loads that occur, the threads of the sheet pile wall anchors are usually upset so that they can absorb higher forces than the rods themselves. Joints at the connection points prevent bending moments from causing overload. With high quay walls it may be necessary to provide several anchor positions at different heights.