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E: yuantai@yuantai-steel.com
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Views: 107 Author: Site Editor Publish Time: 2024-06-26 Origin: Site
Photovoltaic bracket foundations are diverse and suitable for different geological conditions and application scenarios.
Applicable to most geological conditions, especially soft soil or areas with low bearing capacity. During construction, a pile body is formed by drilling a hole and then pouring concrete into the hole. Anchors are usually reserved at the top of the pile for fixing the bracket. It can be a single pile or a combination of multiple piles, such as 4 or 5 piles as a group to support a bracket unit.
Suitable for sites with flat ground and good soil bearing capacity. The prepared concrete blocks are cast in advance. On site, you only need to dig a pit to place it and fix it with mortar, and then install the bracket. It is quick to install and relatively low in cost, but it has high requirements for site flatness.
Applicable to hard rock formations or soils with high bearing capacity. Drill holes directly in the ground, and then install expansion bolts or chemical anchors to fix the bracket. The construction is simple, but it requires precise measurement and positioning, and has high requirements for foundation hardness.
Suitable for soft surface conditions such as sand and grass. The screw pile is drilled by rotation and fixed by the friction of the soil and the weight of the pile itself. It is fast to install and has little damage to the ground, but it is not suitable for rock layers.
Suitable for hard ground or existing hardened ground, such as roofs, parking lots, etc. By directly pouring concrete slabs on the plane and then installing brackets on the slabs. Suitable for distributed photovoltaic projects, load-bearing and waterproofing treatments need to be considered.
This foundation method is suitable for situations where it is not necessary to fix deep into the ground, such as installing photovoltaic panels on roofs or existing building structures. By welding or bolting the brackets on existing structures (such as beams and columns), there is no need to dig the ground. It is suitable for scenarios where there are restrictions on ground changes, but it is necessary to ensure that the original structure can withstand additional loads.
Suitable for occasions where the angle of photovoltaic panels needs to be flexibly adjusted, such as tracking systems. Tracks are laid on the foundation, and photovoltaic brackets can slide on the tracks to facilitate the adjustment of the tilt angle according to the season. A solid foundation is required to support the track to ensure the stability of the system during the adjustment process.
Mainly used in special applications, such as the top of a greenhouse or under an elevated bridge. Use steel cables or other suspension devices to fix the photovoltaic bracket to the upper structure to reduce the space occupied below. The load-bearing capacity and stability of the suspension system need to be accurately calculated to ensure long-term safety.
Used for photovoltaic power stations on water, such as reservoirs and lake surfaces. A buoy or pontoon is used as the foundation, and the bracket is directly installed on the floating body. Special design is required to resist the impact of water flow and the influence of wind and waves to ensure that the system is stable and will not drift.
In some new designs, the photovoltaic bracket and foundation are designed as an integrated structure, such as a prefabricated concrete slab directly integrated with the bracket fixing point. It improves construction efficiency, reduces on-site assembly steps, and is suitable for rapid deployment of large-scale ground power stations.
The soil type (such as clay, sand, rock), ground endurance, groundwater level, earthquake intensity, etc. on the surface will affect the foundation design. For example, soft soil or sand is suitable for screw piles or pre-buried concrete blocks; while hard rock formations are suitable for anchor bolts or direct anchoring.
Including natural factors such as wind speed, snow load, hail, and whether it is close to the coast (consider salt spray corrosion). Strong wind areas require stronger concrete foundations, while corrosion-resistant materials need to be selected in corrosive environments.
Large ground power stations tend to use concrete cast-in-place piles or precast block foundations for rapid installation and large-scale deployment; rooftop photovoltaic systems choose brackets customized according to the roof type (slope roof or flat roof), or suspended or track foundations considering the roof's load-bearing capacity.
The material and construction costs of different foundation types vary greatly, and the initial investment and long-term maintenance costs need to be considered comprehensively. For example, although the initial investment of concrete foundations is higher, its durability may bring long-term benefits.
When the project timeline is tight, it is more appropriate to choose easy-to-install foundation types such as screw piles or precast blocks, which can reduce on-site workload and shorten the construction period.
For systems that need to adjust the angle of the photovoltaic panels or expand in the future, it is more appropriate to choose a track foundation or a bracket foundation with reserved expansion interfaces during design.
Consider whether the foundation design is convenient for subsequent operation and maintenance, such as whether it is easy to approach for inspection and maintenance, and whether it is conducive to vegetation management and drainage.
Reducing damage to the surface and ecological impact is also a consideration when choosing a foundation type, such as the floating foundation has the least impact on the water body.
