Foreword
With the development of photovoltaics today, how to choose the appropriate photovoltaic support according to local conditions is an important link to ensure the safe and efficient operation of the entire photovoltaic system. Starting from the installation form, the existing photovoltaic brackets can be roughly divided into two categories: ground photovoltaic brackets and roof photovoltaic brackets. Let's start with different application scenarios to talk about how to choose a photovoltaic bracket suitable for the project site.
Design and selection of photovoltaic support and precautions during construction
1. The installation structure of the photovoltaic array bracket should be simple, strong and durable. The materials for manufacturing and installing photovoltaic array supports must be able to withstand the harsh environment of the project site, ensure 25 years of weather resistance, corrosion resistance, and structural strength. Anodized aluminum, galvanized steel, and stainless steel are all ideal choices. At the same time, the welding production quality requirements of the bracket must meet the requirements of the national standard "Code for Construction Quality Acceptance of Steel Structure Engineering" (GB 50205-2001). The array bracket is designed to reduce the weight as much as possible in order to facilitate transportation and installation.
2. During the construction of the photovoltaic array foundation and support, it is necessary to avoid damage to the related buildings and auxiliary facilities as much as possible. If the local damage caused by the construction is unavoidable, it should be repaired in time after the construction is completed.
3. When the photovoltaic array is to be installed on the roof, the embedded parts of the foundation and the reinforcement of the main structure of the roof must be firmly welded or connected. If welding or connection cannot be performed due to structural restrictions, measures should be taken to increase the Focus on it and fix it with wire tightening or stent extension. After the foundation is manufactured, the roof damage or the involved part shall be waterproofed according to the requirements of the national standard "Guidelines for Acceptance of Roofing Works Quality" (GB 50207-2002) to prevent water seepage and rain leakage.
4. The photovoltaic cell module frame and bracket must be reliably connected to the grounding system.
Common ground installation and fixing forms
1.Hammer into the ground pile
Measure the distance at the installation site and use a pile driver to drive the column directly into the ground, which is convenient and quick. Geotechnical soil testing is required before installation to determine the appropriate penetration depth.
The following types of profiles are suitable for hammer-into-ground piles, which are selected according to the actual situation:
advantage:
Fast speed and strong adaptability; high-cost performance; not subject to seasonal temperature and other restrictions; easy removal of ground piles without affecting the reuse of the installation site
2. Spiral ground pile
When the installation site is too hard, or there is too much-crushed stone, it is not convenient to hammer the column directly into the ground, a spiral ground pile can be used. Drive the screw-in steel pipe into the ground, and then fix the post on it.
Advantages: strong adaptability, flexible and diverse combination; not subject to seasonal temperature restrictions; easy removal of ground piles, without affecting the reuse of the installation site.
3.Precast cement foundation
If the installation site is not suitable for plug-in ground piles, you can choose to make a cement foundation. The bracket is placed on the cement foundation and fixed with bolts.
Application example: Cement foundation embedded bolt
Advantages: good strength, high precision; strong adaptability to the ground.
4.Direct cement pouring
Another form of mud foundation is to cast the support and cement directly. This way. Compared with the above, the time for bolting and fixing is saved, but the positioning accuracy of the supporting column is required to be higher during pouring.
Application example: direct cement pouring
Advantages: good strength, high precision; strong adaptability to the ground.