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The specifications and models of helical piles vary depending on the usage scenario. Common models include H type, corn type, SS type, etc., with different diameters and lengths. 

Common Specifications

Model: The model of a helical pile is determined by different usage scenarios and requirements. Common models include:

H type: Diameter 76mm, Length 3~6m

Corn type: Diameter 89mm, Length 2~4m

SS type: Diameter 102mm, Length 4~6m

Size Parameters: The dimensions of helical piles include diameter, length, pitch, and number of blades, among others. Different models of helical piles vary in these parameters. For example, the diameter of the H type helical pile is usually 76mm, while the corn type has a diameter of 89mm.

Material: Common materials include Q235 steel and Q345B steel. The choice of material affects the load-bearing capacity and applicable scenarios of the helical pile.

Load-Bearing Capacity: The load-bearing capacity of a helical pile is related to its dimensions, material, and other factors. Generally, the greater the load capacity, the wider the range of applicable scenarios.

Here is the English translation of the provided text about solar pile foundations:

Introduction to Solar Pile Foundations

Solar pile foundations serve as the "foundation" of a photovoltaic (PV) power plant. Their main functions are to stably support the PV modules and resist forces from wind, sand, and settlement. Currently, there are three mainstream solutions available:

· Helical Steel Piles: A popular choice. They are screwed into the ground like "screws," offering very fast installation, no concrete use, recyclability, and no damage to vegetation. Suitable for deserts, grasslands, permafrost, etc., but have high steel consumption, relatively higher cost, and are not suitable for highly corrosive or rocky/gravelly ground conditions.

· Prestressed Concrete Pipe Piles (PHC Piles): An industrial mainstream choice. They are prefabricated in factories, offering high strength and strong load-bearing capacity, suitable for large-scale solar farm projects. However, they require appropriate pile-driving equipment, face difficulties in ground with hard boulders, and the pile body can be easily damaged.

· Cast-in-Place Piles / Ground Anchors (Rock Bolts): Designed for special ground conditions. The former involves on-site drilling and concrete pouring, suitable for areas where excavation is unfavorable; the latter involves pre-drilling followed by grouting for anchoring, suitable for rocky ground. Disadvantages: The former involves on-site wet work and a long construction period; the latter's load capacity depends on rock mass integrity and requires high construction standards.

Quick Selection Tips:

· Consider Ground Conditions: Use pipe piles for soft soil, helical piles for ordinary soil, and rock bolts/anchors for rocky ground.

· Consider Environmental Impact: Helical piles score highest for environmental friendliness due to their removability and land restoration capability.