Underpinning and Piering and all types of Ground Retention

By: ADS Underpinning and Piering  20-Jun-2012
Keywords: Retaining Walls, Anchors, Underpinning

At ADS we work with builders, engineers and architects to find the best sub soil structural solutions to help you successfully complete your project. The experience we bring is one of our greatest assets and it benefits our clients as much as ourselves. We have solid working relationships with a variety of contractors involved in all the elements of anchoring/rock belting/shotcreting industry, so we can either incorporate them into our contract package or advise you who we believe is best suited and equipped to supply any additional related services.

Access is often a major problem in the Eastern areas of Sydney, so manual piling is the only possible method of piering, especially in the early stages prior to excavation, etc. But we are sometimes a cost effective alternative on sites with ample access and cause far less damage and upheaval than large piling rigs, their support vehicles and equipment. In suburban areas this and our quiet work method are often an asset. We also supply a compact concrete pump which is perfectly suited for the work we do and, again, causes far less disruption than bigger units. For more than eight years we have undertaken some of the most difficult and awkward projects and have always brought them to a successful conclusion.

Piling or piering is a method of creating a foundation for a structure in sandy or unstable ground by creating reinforced, solid concrete columns that reach down to the bedrock or nominated depth. These piles/piers can be spaced according to an engineer’s specification or in a line to form a barrier or structural support, which is called contiguous piling. Normally a concrete beam is formed along the top of the piles and is referred to as a capping beam, which adds further structural integrity to the system and can offer a platform for further structural construction Contiguous piling is often used as a retaining wall around the perimeter of a site so that excavation of the site can be safely undertaken whilst the contiguous piles ensure the surrounding ground and buildings, etc, are supported.

Underpinning is a method to create support below the ground for an existing structure. This is required when a structure is either sinking or is showing signs of subsidence which can appear as cracks in the masonry and concrete of the structure. It can also be used to create a void such as room or cellar below an existing building. It can also be used to reinforce existing building and/or structures for additional storeys, extensions, the added weight requires strengthening the existing footings It is a time consuming task as a small area below the existing foundation or wall base is excavated, then filled with concrete and allowed to cure, then dry packed with non shink grout before excavation of the next section is undertaken and the process repeated. This can sometimes be done in several horizontal layers, one below the other. It is basically the building of an underground concrete wall from the top down whilst supporting the structure above Shoring is often used on projects where vertical walls of soil need to be stabilized, either as a permanent, semi-permanent or temporary measure. The same hand piling technique is involved, with piles at predetermined spacing's, but with the insertion of vertical ‘I’ UB beams into the concrete piles that extend up to the required height. Timber sleepers are then placed between the beams to create a retaining wall. These are often used as a temporary measure whilst a permanent contiguous piled wall is constructed in front. Capping beams form the top “cap” of the finished piers, providing an additional structural support.

Keywords: Anchors, Capping Beams, Contiguous Piering, Ground Anchors, Ground Retention, Grout Injection, Piling, Reinforcement, Retaining Walls, Shoring, Steel Walers, Underpinning,

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