Screw piling can be used for a wide range of applications and is essential for the successful installation of builds such as bridges, wind turbines, temporary structures, tree roots, building foundations and much more.
What Is Screw Piling?
Screw Piling is a construction method used to build deep foundations through the use of ground anchoring which is done by steel screw-in piling. Screw piles are circular and hollow steel screw tubes which hold one or more helices on their outer surface. As opposed to auguring through the soil it is being penetrated into, screw piles cut into it following a constant pitch. The helices the screw piles hold are designed specifically to suit the desired ground conditions and can be utilised on a wide range of different soil types. A screw pile is able to remain permanently fixed in place once it has reached the desired ground depth as it is then typically filled with concrete. The protruding screw pile is able to provide a connection between the building above and the ground it is cemented into which in many cases increases the capacity of the pile. Screw piles hold a mechanism of dispersing load which gives them an outstanding in-ground performance.
How Is Screw Piling Conducted?
Screw piles are wound into the ground similar to how screws are wound into wood which is an efficient means of installations. They are installed via the use of a range of different earthmoving equipment which are typically fitted with rotary hydraulic attachments. One of the benefits of screw piling is that the piles can be installed quickly and with minimal noise and vibrations. Importantly, screw piling is subject to building regulations and requires approval from local building control inspectors. Here at Structural Repairs, we are able to confidently handle the liaison with building inspectors and arrange the required inspections as part of the service we offer. Please feel free to get in touch with one of our industry leading experts to attain a free quotation and consultation today!
Are Screw Piles Effective?
Within the construction world, screw piles are known for their impressive in-ground performance which results from their specific mechanism of dispersing load. The helices screw piles hold and the means with which they are filled with concrete once they have reached their desired ground depth makes them further effective at conducting their desired performance. In fact, the unique features of screw piles makes them inherently more reliable than traditional concrete foundation construction methods. With the right screw piles, installed via professional and accurate means, screw piling is an extremely effective remedial method with the potential to avert any unwanted foundational movement in the long run.
How Deep Do Screw Piles Have To Go?
In theory, the depth at which a screw pile can be inserted in the ground is unlimited. However, practically and in terms of economic factors, screw piles are best kept at a total length of less than 14 meters sub ground. Given their unique design and use of helices, screw piles require less length to achieve the same capacity as other forms of piling such and concrete piles. This is because screw piles rely on end bearing on the helix plates only, meaning skin friction is negligible. Additionally, screw piles hold helix plates which perform in the same way as a multiple set of end bearing piles, all while on a common shaft.
How Much Does Screw Piling Cost
Depending on the level of service you’re looking for, screw piling comes in many different forms and with varying different price tags. Each method of screw piling can be used on a range of different structures and using a range of different materials. In addition, the extent of the screw piling necessary will be dependent on the current state of you foundation and the materials it has been constructed from. In all, however, screw piling costs are likely to start from approximately £575 per pile. For a more accurate cost estimation, however, please feel free to get in touch with one of our screw piling experts today.
How Long Do Screw Piles Last?
While the lifespan of a screw pile is dependent upon the type of pile used and soil it has been installed into, under normal use and in an average soil type, screw piles typically are known to last for approximately 75 years. In fact, a tremendous benefit of screw piles is that under most soil conditions, the capacity of a screw pile increases over time due to the effects of thixotropy – the property of a material becoming less viscous when subjected to applied stress. This thus means that the capacity of a screw pile immediately after its installation will likely be lower than its capacity after it has experienced some aging – rendering your investment in screw piles even more beneficial than you may have thought at the time of installment. This entails a full survey used to identify the current condition of your property’s foundation, recommendations of the most effective remedial action which needs to be taken on your build, careful and successful execution of such, as well as any further arrangements necessary such as the attainment of planning permission. For expert advice regarding the structural condition of your property, please feel free to get in contact with one of our specialists today and obtain a free consultation today.
What Machinery Is Used To Implement Screw Piles?
To drive and secure a pile into the ground powerful hydraulic motors are used to apply the large torques which are required as part of the process. The hydraulic motors are fastened onto handling machines that range in size, according to the size of the structure. To connect the pile to the structure under question geotechnical and structural input is required as a means to understand the structure and the ground which the piles are being driven into.