Braced sheet pile shoring wall in sensitive clay

This case history describes the design and performance of a temporary braced sheet pile shoring wall constructed within the median between heavily-trafficked lanes of the Trans Canada Highway in Langley near Vancouver, British Columbia, Canada. The excavation extended to 9.7 m depth below the existing road grade into soft, high plasticity, sensitive glaciomarine clay. Glaciomarine clay is locally notorious for excavation and embankment stability and foundation settlement problems. The shored excavation was required to provide an access pit to allow the installation of a 3 m diameter steel pipe culvert by Horizontal Pile Driving (HPD).

The braced sheet pile wall was designed using the Terzaghi Apparent Earth Pressure distribution and conventional limit equilibrium analysis methods. The excavation was undertaken in stages as the bracing was installed and ground deformation was monitored using slope inclinometers and by survey of surface targets. The case history describes the performance of the excavation and compares predicted to monitored displacements. A particular issue related to face stability due to clay squeezing and running sand during bulkhead sheet pile removal required to commence HPD for culvert installation. The bulkhead face was stabilized by grouting with a water reactive polyurethane grout prior to sheet pile removal.

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Mitigación del asentamiento de la estructura existente por tablestaca tablestacado paredes cuando licuefacción

La licuefacción durante los terremotos induce el daño de las estructuras existentes como levantamiento o asentamiento, dependiendo del peso de la estructura. Es importante mitigar el daño que ocurre por licuefacción para tomar algunas contramedidas contra el desplazamiento vertical dañino.

Este estudio se enfoca específicamente en contramedidas contra el asentamiento inducido por la licuefacción de las estructuras existentes con las paredes de Tablestaca tablestacado durante los terremotos. Para este propósito, el estudio considera los efectos de los muros de tablestacas sobre la disminución de asentamientos inducidos por licuefacción de estructuras existentes usando las pruebas modelo bajo condiciones normales de gravedad (1 g) que simulan la situación de estructuras existentes fundadas en depósitos de arena.

Los resultados muestran lo siguiente: cuanto más largas son las paredes de tablestacas que se instalan, más se puede reducir el asentamiento de las estructuras. La adaptación combinada de la instalación de paredes de tablestacas con una disminución en el nivel del agua subterránea genera un gran grado de reducción en el asentamiento de las estructuras que con la adaptación de la técnica única de instalación de la pared de tablestacas o desagüe de GWL.

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Waling in general

The waling diverts forces from the sheet pile to the anchorage and stiffens as well as aligns the construction. In general, tension walings are positioned on the inside of the main wall, whereas they are usually attached as compression wales behind the wall in case of anchor walls.

EAU 2004 recommends the solid construction as well as generous dimensioning the waling and preferring heavy waling made from S 235 JR (formerly St 37-2) over the lighter types from S 355 J2G3 (for- merly St 52-3).

Load-bearing welding seams must be 2mm thicker than statically necessary due to risk of rusting.

It is recommended to dimension the wales according to the allowed anchor force of the chosen anchor. Apart from horizontal load due to anchor tension, rope tension and forces caused by traffic, the waling is also subject to vertical stress caused by anchor vertical load, soil load and its own weight. There may also be horizontal axial loads along the sheet pile axis due to, for example, rope tension.

Hot Rolled Steel Sheet Pile Sections

Hot rolled steel sheet pile sections have a connection “interlock” at both ends of the section. These interlocks connect with one another to form a continuous wall of Sheet Piling. Soil conditions may allow for the sections to be vibrated into the ground instead of being hammer driven.

Typically hot rolled steel sheet piles are designed to create a rigid barrier for earth and water, while resisting the lateral pressures of those bending forces. The shape or geometry of a section lends to the structural strength.

In addition, the soil in which the section is driven has numerous mechanical properties that can affect the performance. The wall of sheeting provides excellent resistance to bending forces and is used to provide structural strength to a foundation.

U Sections
U shaped sheet pile sections are well proven in both permanent and temporary works throughout the world. Our L and STU series U sections are available in 750/700/600/500mm system widths. All U sections incorporate well-known and efficient Larssen interlocks and offers excellent sealing application.

Z Sections
Z Sections: Continuous form of the web and location of the interlock symmetrically on each side of the neutral axis provides positive influence on the section modulus on the Z section.

Special Sections
Flat sheets, Larssen L430 sheet pile sections and box piles are all types of special sections. Find out their special capabilities and how you can use them in construction.

Corner Sections
Our Corner Sections To find out more and to receive a free consultation e-mail us or call us at 1300 764 164 .

Steel Grades for Steel Sheet Piles
Conditions of supply Hot rolled steel piles are supplied according to DIN EN 10248, cold roll formed piles according to DIN EN 10249.

This article comes from ThyssenKrupp Steelcom editor released

Elaborate on Steel Sheet Piling

Steel sheet piles are long structural sections with a vertical interlocking system that creates a continuous wall. The walls are most often used to retain either soil or water. The ability of a sheet pile section to perform is dependent upon its geometry and the soils it is driven into. The pile transfers pressure from the high side of the wall to the soil in front of the wall.

There are permanent and temporary applications. Permanent sheet piles remain in the ground and serve as permanent retaining structures. Temporary sheet piles are designed to provide safe access for construction, and are then removed.

Hot rolled and cold formed are two primary methods of manufacturing sheet pile. While there are key differences between these two methods, the most important distinction is the interlock. Since hot rolled sheet piles are produced from steel at high temperatures, the interlock tends to be tighter than its cold formed counterpart. Normally, looser interlocks are not recommended in extremely hard driving conditions or for walls requiring low permeability. Hot rolled sheet piles are generally larger and have a broader range of strengths than cold form sheet piles, but there is a large overlap between the two, especially in the most common sizes.

This article from the Skyline Steel editor released