What is Wellpoint Dewatering?
A wellpoint dewatering system is comprised of a set of small wells also known as wellpoints. They can be installed in a specific depth and at a suitable distance within an excavation.
They are linked to the top through a riser pipe which is then connected to the common header main pipe via the flexible pipe.
This flexbow has an adjustable pushfit valve, which allows for the control of the flow of water and air into the system, referred to as trimming. It also gives the user a clear picture of the contents being flowed.
The main pipe for the header connects to a wellpoint dewatering machine and it is discharged to the point of discharge.
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The SLD's Wellpoint Dewatering Systems are extremely flexible and can be utilized in a variety of uses.
They are able to reduce and regulate the levels of groundwater in excavations to ensure an unprecipitated and stable work space. They're ideal for foundations with shallow depths and trench work.
Wellpoint Dewatering Systems Wellpoint Dewatering Systems have the capability to handle extremely small flows in silty silty sands and much bigger flow in coarse sands as well as gravel.
If the excavations are too deep for one stage wellpoint dewatering systems, SLD Pumps and Power offer an option to rent multiple stages.
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Wellpoint dewatering systems usually consist of a set of smaller diameter steel riser pipes or uPVC which have an intake filter at its base. They are installed in close to the centres (typically 1.0m from 2.0m centres) around excavations or in a trench for pipelines.
Each wellpoint is connected using a variety of control swings on the surface to an intake pipe or a primary header (galvanised steel, HDPE or galvanised).
It is connected to the vacuum pump (centrifugal or piston type) that recirculates groundwater to an outlet point. A typical pump can operate for a maximum of 100 lin.m of main header.
While ground conditions may dictate the design for dewatering, wellpoints can be efficient for all excavations that are 5m-6m deep.
For fine soils or more extensive excavations the wellpoint system will be constructed from the ground, with the it is placed at a lower depth below the ground. If the depth is greater, and the space allows multi-stage systems are installed.
Wellpoints are mostly utilized for temporary construction dewatering. They can also be employed for dewatering systems that are permanent and also for abstraction for irrigation and private water supply systems.
Wellpoints are installed by different methods. The majority of wellpoints, they are constructed using the conventional jetting technique.
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This involves pumping water at a high pressure (supplied through an jetting pump or compressed air) through a steel placement tube, which is suspended by an excavator that is 360deg. If there is an upper Clay is present, wellpoints could be already augured by an hydraulic auger attached to the 360deg excavator.
In certain conditions, wellpoints may be installed manually by self-jetting or self-jetting wellpoints (steel or UPVC). In other situations, where cobbles or rocks occur, wellpoints can be drilled using the smallest rotary drilling equipment.
For more information about well pointing, get in touch with Stuart Wells Limited.