Vertical Wick Drain- case study 47

Why a Vertical Wick Drains is Used: Vertical wick drains are one of the most used drains, which are employed as drain column in vertical drainage system. They also known as PV drain as well as prefabricated vertical drains. In the modern times, construction sector is dependent on the nature of soil. Fine-grained soils such as soft silt and clay frequently create severe problems in construction.

Due to this, Vertical wick drains are used for accelerating the solidification, settlement and strengthening of fine-grained or soft soils to speed up construction as well as to curb long-term settlement. If Vertical wick drains are not used, then consolidation of fine-grained soil may takes years, which will seriously affect construction. How Vertical Wick Drains Works: Vertical wick drains has plastic core wrapped in geo-textile fabric.

They are deeply inserted in fine-grained soil or saturated soil in combination with pre-loading to form drainage medium in the soil. Preloading is defined as process of soil compression subject to applied vertical stress. This process is undertaken prior to construction, to avoid any loopholes during construction.

Due to Vertical wick drains, the process of preload is shortened to months; otherwise, it may take years to consolidate soil. Water will escape through the settlement of the preload and helps induce consolidation, compression and settlement in the soil. One of the important things, which Vertical Wick Drains does, is that it creates an artificial or free path through which water easily reaches free drainage and in the process, the time of settlement and consolidation of soil decreases massively.

The whole process helps engineers to initiate the construction work as soon as possible without waiting for months or years. How Vertical Wick Drain is Installed: The prefabricated vertical wick drains are installed with the help of stitchers, which are especially created to ease the installment procedure and they are mounted on cranes. The mandrel of crane tightly hold vertical wick drain and it is hydraulically pushed in vertical direction in the ground to the preferred depth up to the bottom of the fine-grained soil layer.

The mandrel is carefully removed without disturbing the wick drain arrangement and the vertical wick drain is left in the soil to perform his job. Vertical Wick Drain Application: Wick drain are included in buildings, warehouses, storage tanks, dams, large storage areas, airport runways, levees, highway and roadway embankments, abutments, marine terminals, tanks, bridges, waste sites and many more places.

However, the most common application of Vertical Wick Drains is consolidation, solidification and settlement of fine-grained or soft soil so that construction can start immediately. They are cost effective and can be installed in very less amount of period.

They even require less workers and it is mostly preferred over horizontal wick drains.

The
Various Types of Drains

Although most people
immediately think of storms and floods, when pipes and drainage are being
mentioned, there are actually several drain types that can be used for a
variety of purposes. If you want to learn more about them, read on.

Storm Water
Drainage

Unlike regular
rainfall, storms often bring an extraordinary amount of rainwater to an area.
The various types of soil as well as the structure of the area may not be
adequate to handle the exponential increase in water, and without a proper
storm water drainage system, the area may become flooded as a result.

With the right
storm water drain system, a home, a street, and even an entire community can be
protected from floods. Retail parking lots as well as airport runways and
tarmacs can also benefit tremendously from a properly installed storm water
drainage system.

There are several
options available when it comes to drain types that may be employed for the
purpose of preventing floods. The traditional option used to be concrete pipes.
But with the recent advances in modern technology, there are already pipes made
of polyethylene, which offers several distinct advantages. Among them is that
the lighter weight of the material being used decreases the time needed to
install the system when compared to the installation of concrete pipes. In
addition, unlike concrete pipes, these newer pipes do not require the use of
heavy equipment during installation. And despite the lightness of polyethylene
compared to other drain types, it is still tough enough to withstand corrosion,
abrasive flows, and even the harshest sewer cleaning tools.

Sanitary Pipes

Perhaps the most
overlooked among the types of drains that an average home uses is the sanitary
pipe. In fact, most homeowners only notice it when it begins to malfunction.

Though there are
a variety of options for the kind of pipe you can use for this purpose, you
will need long-lasting pipes that are economical. PVC pipes used to be the pipe
of choice for this system, but now newer polypropylene resin pipes have
replacing them. These pipes are lightweight and easy to install. They are also
resistant to impact and abrasions, and do not get damaged when they come in
contact with various chemicals.

Agricultural
Drains

Some people
actually believe that farmlands do not need pipe drainage systems at all. They
assume that the presence of soil is more than enough to absorb any level of
rainfall. However, this is entirely incorrect. In fact, countless corrugated
polyethylene pipes have already been set up in American farmlands today, and these
pipes are used primarily for field drainage so that flooding can be avoided and
the farmland can yield more crops.

Even if flooding
is not a concern, these pipe systems can be used to control the level of
moisture in the soil. It will enable farmers to have their lands yield better
and healthier crops. These pipes are often outfitted with screen guards to
prevent debris and animals from entering the drainage systems.

Deps- Delivering Economic Piping Solutions.

 Guaranteed.

Pvc pipe is used in the drilling industry for many reasons some of which are Borecasing and screens in irrigation and environment bores.

Dewatering bores in the civil sector and the mining sector, They can be used for explosive, monitoring, water and uranium collection.

When pipe is manufactured in Australia by reliable manufactures such as Pipemakers, Vinidex, Tyco and Iplex you can be assured that their pipe is of high quality as they are all committed to a high quality control regime.

The majority of pipe used in the above areas are made to the AS1477, this is also called for in the Minimum standards for drillers and many Council regulations.

This Minimum guideline was written for licensed drillers to follow.

If inspected by a drill Inspector and the bore is found not to meet the Min. Standard then the driller can be made to fix the problem or be prosecuted.

If the manufacture does not meet the AS1477 standards, they too will feel the ramifications and may lose their licence to manufacture pipe approved to AS1477 standard.

When pipe is manufactured to be used in an environmental monitoring project the consultants demand that there is no printing on the pipe as if any of the printing chemicals used leach’s  into the fluid being monitored it will cause the readings of the ground water to be wrong.

All pipes used in monitoring situations are to be non leaching to avoid contamination of the bore being monitored.

50mm cl18 has been the standard pipe used in monitoring wells over the last 17 years, but with the advent of new machines such as the Geoprobe, sizes such as 20 or 32mm Pvc pipe have become regularly used.

As these sizes fit inside the drill rods that are pushed down, so when these rods are extracted the Borecasing and screens are in place. A very quick method of creating monitoring bores.

For More Information

Ph 1300 133 000

sales@deps.com.au

www.deps.com.au

Our Product Range

Borecasing & Screens, PVC Pipe & Components, Environmental, Drilling Products, Water Treatment, Safety & Cleaning Products, Sand Spears, Pumps.

 Thank you for your time

Imagine waking up and knowing that you are getting paid to do what you
love and totally committed to, Wow ! 

Technically that is what the Olympic ath.lete’s do. The majority are on a
scholarship, or being paid.

Ian Thorpe on his comeback stated, “I forgot how hard it was to get up every
morning at 5.00 and train.”

This time round he was not as dedicated or as hungry for success as he once was.

It is about desire. 

As Deps is coming up to 20 years in your industry, I look back and remember
working long into the night to get a job out in time or building a new machine.

These days I see myself as a bit of a entrepreneur.

They say that this type of person gives up the right to work 8 hours so they can
work 12 hrs a day.

Deps is not open 12 hrs, but if your Job needs that to happen and can support the
overtime then we would be able to arrange this as we have done in the past.

If you need any assistance please contact our sales Manager Brooke on 1300 133 000

The R40.1 specifications states “The drain pipe must be of rigid unplasticised polyvinyl chloride (UPVC) complying with AS 1477.1 and have a strength grade of Class 18.”

Each drain comprises an inner and outer pipe, and the outside diameters and the wall thickness must be as given in Table R40.1 below:
 

If you need a copy of the RDA D&C R40 specifications the link is below:

http://www.rta.nsw.gov.au/cgi-bin/doingbusinesswithus/specifications/index.cgi?r040_e1_r2.pdf

A UPVC cap complying with the same standard must be fitted to the upstream end of each drain pipe.

The pipes must be provided with slots of width between 0.90 mm and 1.10 mm, extending to a minimum depth equal to 3/8 of the outside diameter of the pipe and a maximum depth equal to half the outside diameter of the pipe, and spaced at 25 mm apart.

The slots must be cut in groups of twelve. Each set of twelve slots at 30° to the horizontal and orientate each alternate group to lie within the top 240° of the circumference. In this fashion, the bottom 120° of the circumference of the pipe remains uncut over its entire length (see Figure R40.1).

The pipe must be un-slotted for a length of 1 m from the outlet end, or whatever length as directed by the Principal.

The problem here is there is no pipe that has a  75mm OD , the closest is 80mm which has a od of 88mm, but if it has the bell on the pipe( 103mm) this will not fit into the 114mm od pipe.

This is a dilemma as by using another size pipe, it then does not meet the standards.

By using a special size pipe Deps has overcome this problem.

If you need any more info please contact us on 1300 133 000