Helical piers are commonly used in foundation wall repairs and stabilization. They are deep foundation elements that consist of a steel shaft with helical plates attached to it. These plates resemble a large screw or auger and are designed to be twisted into the ground, providing support and anchoring for the foundation.
Here’s how helical piers are typically used in foundation wall repairs:
- Assessment: A professional engineer will assess the condition of the foundation wall and determine if helical piers are suitable for repair. They will examine the extent of the damage, soil conditions, and other relevant factors.
- Design: Based on the assessment, the engineer will design a plan for the installation of helical piers. The design includes determining the number, size, and placement of the piers to adequately support the foundation wall.
- Excavation: The area around the foundation wall is excavated to expose the damaged section. This allows access for installing the helical piers.
- Installation: A hydraulic torque motor or another specialized equipment is used to rotate the helical piers into the ground. The helical plates cut into the soil and screw the piers downward until they reach a stable load-bearing stratum. The depth and torque required for installation depend on the soil conditions and the load-bearing capacity needed.
- Bracket Attachment: Once the piers are installed to the desired depth, steel brackets are attached to the foundation wall. The brackets provide a connection point between the helical piers and the wall. They distribute the load and transfer the weight of the foundation to the piers.
- Wall Stabilization: Using hydraulic jacks, the foundation wall is carefully lifted and stabilized by applying controlled pressure to the brackets connected to the helical piers. This helps restore the wall to its original position and relieve pressure on any damaged areas.
- Grouting and Backfilling: After the stabilization process, the excavated area is backfilled with suitable soil and compacted. Grouting may also be performed to further enhance the load transfer and stabilize the soil around the piers.
- Monitoring: It is common for professionals to monitor the repaired foundation wall over time to ensure its stability. This may involve periodic inspections and measurements to detect any signs of movement or further issues.
Helical piers provide a reliable and cost-effective solution for foundation wall repairs, particularly in cases of foundation settling, bowing walls, or other structural issues. However, it is crucial to consult with a qualified engineer or foundation specialist to assess the specific situation and determine the appropriate repair method for your foundation.
