Steel sheet pile wall

Steel sheet pile walls also have the advantage of not requiring site excavation. However, the interlocks are sources of leakage as soon as placed. In general, sheet piling is not recommended as a primary barrier to enclose contamination. 

The steel sheet pile wall is assumed to be made of mUd steel with a Young modulus of 200,000 MPa and a Poison s ratio of 0.3. It is modeled using elastic elements. For instance, the cross section and the properties of a sheet pile used in practice are shown in Fig. 25.9. The thickness of the steel finite elements is assumed to be 0.2 m, giving bending stif iess equivalent to the real one. Since the thickness of... 

For existing multi-storey buildings supported through rafted pile foundations on a liquefiable soil, the steel sheet pile wall bearing on the non-liquefiable soil surface seems to be an optimum solution for protecting the building from soil liquefaction. 

The Waterloo Barrier is a low-permeability cutoff wall for groundwater containment and control. The technology uses steel sheet piling with joints that can be sealed after the sheets have been driven into the ground. This technology has also been used as a soil-gas barrier. 

Some of the worst conditions are met in excavations that have to be taken below the water table (Forth, 2004). In such cases, the water level must be lowered by some method of dewatering. The method adopted depends on the permeability of the ground and its variation within the stratal sequence, the depth of base level below the water table and the piezometric conditions in underlying horizons. Pumping from sumps within an excavation, bored wells or wellpoints are the dewatering methods most frequently used (Bell and Cashman, 1986). Impermeable barriers such as steel sheet piles, secant piles, diaphragm walls, frozen walls and grouted walls can be used to keep water out of excavations (Bell and Mitchell, 1986). Ideally, these structures should be keyed into an impermeable horizon beneath the excavation. 

In some cases, only one type of soil is readily obtainable for an earth dam. If this is impervious, then the design will consist of a homogeneous embankment, which incorporates a small amount of permeable material in order to control internal seepage. On the other hand, where sand and gravel are in plentiful supply, a very thin earth core may be built into the dam if enough impervious soil is available, othenwise an impervious membrane may be constructed of concrete or interlocking steel sheet piles. However, since concrete can withstand very little settlement, such core walls should be located on sound foundations. 

Sheet pile elements are bended steel plates with U- or Z-shaped sections and contain a side groove to connect next sheet pile elements. Some heavy-duty elements have l -shaped sections. The sheet pile elements can be driven along the wall layout line directly. Piles are premanufactured to be installed side by side and automatically connected to one another. Therefore, sheet pile retaining systems can be installed much quicker than other systems. Most sheet pile elements have connections that are water tight. As a result, sheet pile systems are commonly used in hydraulic projects. Steel is the most common sheet pile material. Presently, there are vinyl sheet pile products available in the market. For transportation projects, sheet pile systems are often used as a temporary shoring structure. When sheet piles are used as a permanent system, a wall cap on top shall be specified. Some manufacturers have their own prefabricated cap system. It is a common practice to build a concrete cap. If the wall was used as part of a support structure, the sheet pile wall can directly be embedded into the above structure s concrete base. 

A 690 High-strength low-alloy steel H-piles and sheet piling Ni, Cu, Si Structural-quality H-pills and sheet piling Corrosion resistance two to three times greater than that of carbon steel in the splash zone of marine marine structures Dock walls, sea walls Bulkheads, excavations and similar structures exposed to seawater... 

---