While some piles go straight into the ground, some use exterior casings. These casings can stay around piles permanently. Or, they can go in temporarily before you remove them at the end of the job.
What are the benefits of using cased piles?
Get Extra Support On Difficult Ground
Not all ground conditions are suitable for piles. For, example, if you are working on weak or unstable ground, then the hole you bore might collapse in on itself as you drill it. If the hole fills itself in, then you can't install a pile in it.
You'll sometimes have similar problems if you're working close to a water source, like a river. The ground in the area might be wet and soft. Or, it might be dry and sandy. In either case, the ground might not have the stability to hold its shape until you're ready to construct or install its holding piles.
Sometimes, your working ground might be in the right condition to bore; however, its layout poses problems. For example, if you need to use piles on sloped ground, then you could have a problem keeping their holes from caving in. The slope can put pressure on the sides of the pile's hole which makes it collapse.
In all these circumstances, casings will help. If you install a casing when you drill, or just after drilling, then the hole will keep its shape. The casing will hold the earth in place and prevent it from filling the hole before you install its pile.
Get Extra Piling Protection
If you're pouring concrete piles on site, you have to factor in how ground conditions might affect your finished support. If you need solid load-bearing foundations here, then each pile has to be set in a perfect state so that it can do its job.
Some soils and ground conditions affect the way that concrete sets and cures. For example, loose and sandy soil might crumble into the concrete when you pour it into the borehole. The soil affects the composition of the concrete. It can make it weaker or prevent it from achieving its specified shape.
Here, casings keep concrete away from the soil until it sets. You don't have to worry about cross-contamination. The piles hold the earth away from the concrete so that the two materials never mix.
To find out more about cased piles and whether they are the right solution for your needs, talk to piling contractors. They can assess your build and your plans and help you choose the right type of piles for the job.