PRE-DRILLING AND WATER JETTING

Pre-drilling and water jetting (sometimes referred to as fluid injection) are techniques that Sterk employs to minimise soil resistance and thus make it easier to install sheet piling by means of pressure or vibration. In the case of using vibratory means to install sheet piling, another reason for choosing to pre-drill or use fluid injections is to reduce any nuisance caused by vibration.

Water jetting
Water jetting is a process in which sheet piling is installed while water under high pressure is injected at the leading edge of the sheet piling. This is done at a low level of discharge or debit (the flow rate per unit of time). This creates temporary water over-tension at that point, enabling the sheet piling to be installed with less resistance and thus more easily and with less nuisance from vibration. Owing to the low debit, the substrata are able to recover and this means that the soil’s properties undergo hardly any change.

Pre-drilling
Advance soil loosening, also often referred to as pre-drilling, is also performed to make it easier to install sheet piling by means of vibration or pressure and/or to minimise the nuisance caused by vibration. Sterk owns a variety of leader rigs that can be equipped with drilling engines of up to 30 metres. We also have suspended drills that make it possible to pre-drill to 16 metres. Their design allows them to be mounted to our hydraulic cranes and thus removes the need to bring a separate rig on to the site. If so desired, bentonite cement can be injected during the pre-drilling process to minimise any subsidence.

Soil Remediation in Katwijk, the Netherlands: Water Jetting

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Pre-Augering and Pressing Sheet Piles in Utrecht

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