Soldier Pile Wall With Concrete Lagging

The former is either forced into the ground to an adequate depth or installed into holes which are drilled in advance then encased in lean concrete to oppose or withstand the moment exerted by soil and the spacing is commonly between 1 8 m to 2 45 m.

Soldier pile wall with concrete lagging.

Soldier piles beams and lagging is an excavation support technique where vertical piles most commonly steel piles either driven or lowered into a drilled excavation and grouted are at regular intervals along the proposed wall location. Piles are socketed 10 feet into shale and. Soldier pile walls have successfully being used since the late 18th century in metropolitan cities like new york berlin and london. Wood lagging sometimes steel or concrete panels is placed between the soldier piles as excavation proceeds typically in 3 ft to 5 ft increments.

The lagging efficiently resists the load of the retained soil and transfers it to the piles. Also tiebacks can be drilled and grouted into the retained material to increase wall stability. Soldier pile wall consist of wide flange steel beams soldier piles and wood lagging. Soldier pile and lagging walls commonly known as soldier piles are some of the oldest forms of retaining wall systems used in deep excavations.

Project required a 400 foot long soldier pile wall with concrete lagging panels. Lagging is important to transfer the horizontal pressure of the soil strata to the soldier piles and prevent soil flow between the soldier piles. Lagging consisting of wood steel or precast concrete panels is inserted behind the front pile flanges as the excavation continues. Lagging for soldier pile walls with and without permanent ground anchors shall be designed as either temporary or permanent based on the conditions described below.

When the soil has stand up time then the lagging can be inserted from the top and placed with a downward pull. The geotechnical services branch will specify when lagging shall be designed for an additional 250 psf surcharge due to temporary construction load and which shall also be shown. Furthermore the wall can be additionally reinforced by adding walers or steel supports between the soldier piles. Additionally contact lagging or shotcrete may be applied.

As excavation progresses in stages horizontal lagging in the form of timber or precast concrete is added behind the flanges to create the soldier pile and lagging wall. The lagging transfers the pressures of the retained strata to the soldier piles. Concrete lagging or even shotcrete lagging is generally only used for permanent walls.