A wellpoint dewatering method consists of a number of small wells also known as wellpoints. They are installed at a specified depth and have a proper spacing within an excavation.
The well pointing is joined to the ground through a riser pipe which is then connected to the main pipe of a common header via an elongated flexible.
This flexbow has an adjustable pushfit valve that allows for the control of water and air entering the system, referred to as trimming. This allows an accurate view of the fluid being flowed.
The main pipe of the header connects to a wellpoint dewatering machine and discharged at the point of discharge.
The SLD's Wellpoint Dewatering Systems are extremely adaptable and are suitable in a variety of purposes.
Also Read: Contour Interval
They are able to reduce and regulate the level of groundwater in excavations to ensure dry and stable working environment. They are ideal for foundations with shallow depths as well as trench construction. The SLD's Wellpoint Dewatering Systems have the capability to handle extremely low flow rates in silty sands and much bigger flowing flows within coarse sands as well as gravel.
When excavations are too extensive for one stage wellpoint dewatering system SLD Pumps and Power offer multi-stage rental solutions.
Wellpoint dewatering systems are typically made up of a set of smaller diameter steel riser pipes made of uPVC which have an intake filter at the bottom, and are situated at close centers (typically 1.0m from 2.0m centres) in an excavation, or in a trench for pipelines.
Each wellpoint is connected using a variety of control swings on the surface to the collection pipe or the head main (galvanised steel, HDPE or galvanised). The pipe is connected to the vacuum pump (centrifugal or piston type) that recirculates groundwater to an outlet point. In general, a single pump is able to operate up to 100 lin.m of main header.
Also Read: Abutment Bridge
The ground conditions can affect the dewatering plan, wellpoints work for the majority of excavations that are 5m-6m deep. In the case of fine soil or excavations that are deeper the wellpoint system is placed from and the it is placed at a lower the level of the ground. If you want to dig deeper, if the space allows multi-stage systems may be installed.
Wellpoints are primarily utilized for temporary construction dewatering. However, they are also employed for dewatering systems that are permanent and also as a method of abstraction for irrigation and private water supply systems.
Wellpoints are constructed using various methods. The majority of wellpoints, they're installed using the traditional jetting technique. This involves the pumping of water at high pressure (supplied via an jetting pump or compressed air) through a steel placement tube that is suspended by the 360 degree excavator. If there is an upper Clay is present, wellpoints could be prior-augured with an hydraulic auger attached to an excavator that is 360deg.
In limited conditions, wellpoints can be manually installed using self-jetting points (steel or UPVC). In other situations, where cobbles or rocks occur, wellpoints should be drilled with the smallest rotary drilling equipment.
For more information about well pointing, call Stuart Wells Limited.
Also Read: Sheep Foot Rollers