Ramming Pile Solar Ground Mount - Carbon Steel

Based on differences in foundation type and structural design, ground-mounted photovoltaic (PV) piling systems can be categorized into the following main types:

▪ Spiral Pile System:

This system uses steel pipe piles with helical blades, which are screwed into the soil using specialized machinery. No vibration or hammering is required, resulting in minimal soil disturbance. Suitable for deserts, grasslands, tidal flats, permafrost, and Gobi deserts, it is particularly suitable for dry, hard soils (rocky soils, permafrost, gravel, pebble soils, etc.). Spiral piles are reusable, making them environmentally friendly.

▪ Steel Single-Column Piling System:

This system uses a single galvanized steel pile as its foundation. Its simple structure and single-column design significantly reduce piling time and improve foundation construction efficiency. Suitable for uneven terrain, the support height can be adjusted according to the terrain, offering significant economic advantages for large-scale projects.

▪ Steel Double-Column Piling System:

This system features a double-column structure with the head capable of rotating at large angles in three directions. Suitable for complex terrains such as slopes and undulating surfaces. The double-column configuration provides higher structural stability and resistance to lateral loads, making it particularly suitable for areas with high wind loads. Precast Concrete Pipe Pile (PHC Pile) System: This system uses prestressed high-strength concrete pipe piles driven into the soil, with a pre-installed steel plate or bolts at the top for connection to the upper support. It is suitable for areas with high clearance requirements, flood-prone areas, tidal flats, and soft soil conditions. Precast concrete pile foundations can be prefabricated and mass-produced in factories, ensuring stable and reliable quality.

▪ Static Pressure Pile System:

This system uses a hydraulic static pressure pile driver to press precast piles (mostly PHC pipe piles or steel piles) into the soil. It features low construction noise and no vibration. It is particularly suitable for noise and vibration sensitive areas such as urban peripheries and is applicable to soil layers with high bearing capacity.

▶ Important On-Site Geological Survey:

A professional geological survey must be commissioned before construction to determine the soil type and bearing capacity (≥120kPa for typical scenarios). Geotechnical investigation is a prerequisite for selecting the appropriate pile type and determining the driving depth; blind construction based on experience is strictly prohibited.

▶ Precise Pile Position Layout:

Before pile driving, measurements must be taken according to the design drawings to determine the precise coordinates of each pile position. A wire rope positioning method can be used to strictly control pile position deviations, ensuring that the spacing and elevation of piles throughout the site meet design requirements.

▶ Construction Method Selection and Process Control:

Helical piles should be driven using rotary drilling; hammer driving is strictly prohibited to avoid damaging the helical blades. Steel piles and precast concrete piles should preferably be driven using a clamp-type hydraulic vibratory hammer, or hammer driving can be used. The pile driving depth must be strictly controlled according to the design value; controlling the pile elevation and pile position deviation is the core content of construction quality control.

▶ Special Treatment for Winter/Rainy Season Construction:

During winter construction, the pile foundation depth should be adjusted according to the frost depth. In areas with high groundwater levels, driven pile foundations should be preferred over cast-in-place concrete piles (the latter are difficult to construct and maintain in winter).

▶ Corrosion Protection:

The hot-dip galvanized anti-corrosion coating should not be damaged during scaffold installation. In areas with highly corrosive soils, higher-level anti-corrosion measures are required (such as increasing the galvanization thickness or using an epoxy coating); conventional hot-dip galvanized steel piles should not be used directly.

▶ Installation Accuracy Control:

During installation, ensure that the verticality of the columns (verticality ≤ 1mm), the horizontality of the beams, and the overall tilt angle of the scaffold system meet the design requirements. The horizontal deviation along the entire east-west length (at the same elevation) should be ≤ 10mm. The acceptance of fixed scaffold installation should comply with the relevant provisions of the "Standard for Acceptance of Construction Quality of Steel Structures" GB 50205.

▶ Load Verification:

For areas with large wind and snow loads, a professional structural design verification is required. Wind and snow loads should be calculated using values ​​with a return period of 25 years. The shape factor for foundation wind load should be ±1.3.

▶ Test pile verification:

Before formal construction, it is recommended to conduct test pile verification to test the bearing capacity of individual piles (including compressive, tensile, and horizontal bearing capacity) to verify the rationality and reliability of the design.

▶ Site protection and environmental restoration:

After construction is completed, temporary construction facilities should be promptly dismantled and cleaned up, and the affected surface environment should be restored to minimize damage to the site's ecological environment.