1. Design: Helical piers, also known as helical piles or screw piles, are deep foundation elements that are screwed into the ground. They have one or more helix-shaped blades attached to a central shaft, which aids in this process.

2. Installation: They are installed by a machine that turns the pier into the ground, similar to a screw being turned into wood. The number of turns and the torque applied during installation is monitored to determine the capacity of the pier.

3. Soil Type: Helical piers can be used in a variety of soil conditions, but they are especially beneficial in conditions that are not suitable for conventional pile driving, such as soft soils, sandy soils, or areas with high water tables.

4. Vibration and Noise: The installation of helical piers generates less noise and vibration than driving non-helical piers. This makes them an excellent choice in sensitive areas or close to existing structures.

The choice between helical and non-helical piers often comes down to the specific conditions of the construction project, including soil conditions, noise concerns, and the load requirements of the structure.

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Non-Helical Piers (Straight Shaft Piers):

1. Design: Non-helical piers, such as driven piles or drilled shafts, don't have the helix blade. Driven piles are typically hammered, vibrated, or pushed into the ground, while drilled shafts are poured in place in a drilled hole.

2. Installation: The installation process for these types of piers generally involves either driving the pier into the ground using a heavy hammer (driven piles) or drilling a hole and then filling it with concrete (drilled shafts).

3. Soil Type: Non-helical piers, like driven piles, are often used in harder soil conditions where it's possible to drive the piles into the ground. Drilled shafts can also be used in a variety of soil conditions and are sometimes preferred in urban areas where there are concerns about vibration from pile driving.

4. Vibration and Noise: These types of piers can generate significant noise and vibration during installation, which can be a concern in populated or environmentally sensitive areas.

The choice between helical and non-helical piers often comes down to the specific conditions of the construction project, including soil conditions, noise concerns, and the load requirements of the structure.

1. Faster Installation: Helical piers can be installed more quickly than other types of piers, reducing labor costs. There is no need to wait for concrete to cure, as in the case of traditional footings or drilled shafts, and the site requires less preparation.

2. Less Site Disturbance: Because they're screwed into the ground, helical piers cause less disturbance to the surrounding soil than driven piles or drilled shafts. This means there is typically less need for expensive soil remediation or site restoration work.

3. Versatility: Helical piers can be used in a wide range of soil conditions and locations. This versatility can result in cost savings if alternative foundation solutions would require more extensive and costly soil improvement measures.

4. Adjustable: If the soil conditions are not as expected, helical piers can be adjusted by adding or removing helix plates or by changing the installation depth. This adaptability can prevent costly project delays or modifications.

5. Minimal Equipment: Helical piers don't require large or heavy equipment for installation. This means lower transportation costs and less potential damage to existing structures or landscaping.

6. Reusable: In some situations, helical piers can be unscrewed and reused, offering cost savings for temporary structures or in changing conditions.

All these factors combine to make helical piers a potentially cost-effective solution for a variety of foundation needs. However, the exact cost-effectiveness will depend on the specific project and site conditions.