Underpinning is one of the best methods for increasing the depth of a foundation or repairing a faulty foundation. This could be the case if the foundation is damaged or you intend to add more storeys to an existing building. One of the common signs that show a structure requires underpinning is when it has visible cracks, or there is a sign of a faulty foundation, particularly diagonal cracks.
The most popular technique an underpinning contractor can use is the mass pour method. The procedure needs excavating sections arranged in sequence to a certain pre-determined depth below the footing. Concrete is then placed on each pit. This technique is usually repeated until the affected area is underpinned. But, there are other techniques underpinning experts use. Keep reading to know more.
Pile & Beam Technique
The pile and beam underpinning technique is a great method for alleviating footing. To use this system, a mini-pile needs to be installed on any part of the affected wall. Once the piles are installed, the brickwork below the wall is removed, and then a reinforced concrete beam is utilised to support the wall and connect piles.
To accommodate high loads, the distance between needle beams must be reduced. Moreover, the bearing capability of underlying strata normally determines the depth, number, diameter and the spacing of piles. Case driven piles or augered piles could be used with this underpinning technique.
Contractors prefer the pile and beam technique because it is faster compared to traditional underpinning, ideal for restricted access, there's less disruption and handles high load capacities.
Screw Piles & Brackets Technique
This underpinning method is usually used in instances where the traditional procedure isn't possible. A building might need excavating to a greater depth or perhaps it's impossible to go for a pilling rig; the best method to use in these situations is crew piles & brackets technique. Screw piles and brackets may be mounted by hand or using small equipment like a mini excavator.
Once installed, the structure is then lifted to the level position while the foundation's weight is transferred to the pier & bracket system. Screw piles offer many benefits than traditional piling such as minimal vibration, little noise and high installation speeds.
There are other underpinning techniques your contractor may recommend depending on the situation at hand. So to get quality services, be sure to hire a qualified, experienced and licenced contractor. For more information, contact a company like Pro-Pin Professional Underpinning.