Talking about the Application of Excavating and Altering Rock Drill on the Construction of Photovoltaic Pile on Mountain Slope

In recent years, the country’s increased awareness of environmental protection and its emphasis on new energy industries have shown a special interest in the low-cost, short-term, quick-to-use, non-polluting PV industry. Make the photovoltaic industry develop rapidly. Especially in Inner Mongolia, Xinjiang, Hebei and other provinces have become a scale, energy-saving emission reduction effect is obvious. This article makes a simple comparison of several mechanical construction technologies for photovoltaics.

Spiral pile drilling rig currently has a photovoltaic foundation in the plains, deserts, and general hills. The slope is gentle, the slope is less than 30 degrees, and the geological structure also uses spiral drills under conditions dominated by sand, gravel, hard soil, and limestone. The advantage of construction is that it can be constructed in large areas and at the same time, the work is moving fast, the construction period is short, and the cost is low. High safety, after replacing the power head of the equipment, it can also be used as a screw pile machine to install spiral piles. The construction method is getting mature. The disadvantages are in some complicated terrain projects, such as Sichuan Xiaolongtan, Hebei Quyang, Hainan Xiangshui, hilly mountains, etc. The steep slopes in the area have large gaps, vertical and horizontal faults, and the gullies are covered by solitary rocks, exposed rocks, and unfavorable geological conditions such as red clay.

Most crawler-type pneumatic DTH rigs in mountainous regions use crawler-type pneumatic DTH rigs. The advantage is that they can drill different pore sizes depending on the model. There is a certain degree of climbing ability, normal work 32 degrees slope. Defective climbing angle is small, the limit is not more than 35 degrees slope. Difficulty of movement, slow speed, poor stability, low safety, rain, fog, wind, weather can not be normal construction and a series of problems will be revealed. Slopes over 35 degrees can only use traditional manual construction, which takes time and effort, slow speed, high cost, and concrete casting construction is also difficult. Because photovoltaic piles have a small single foundation, a large number, and a wide range of points, steep slopes and agricultural tricycles cannot reach the site. They can only be pushed by unicycles and manually picked to complete the casting. The progress and quality of the project are difficult to guarantee.

If the hydraulic excavator is changed to a hydraulic rock drill, if a new type of excavator-modified hydraulic rock drill is used, the construction efficiency will be greatly improved. A medium-sized excavator can complete a series of work such as drilling, casting, and road construction within a range of 100 square meters, and the rock drilling speed is fast (one meter per minute), is not affected by the weather, and the climbing ability is strong. Up to 70 degrees. High safety, short duration, and low cost. If a simple channel is built in the middle of two photovoltaic squares, it can be constructed on the basis of two square arrays at the same time. From my personal work experience, no matter what kind of equipment has its limitations, the complexity of the mountain terrain requires a variety of equipment to work in order to be complementary, simple and quick completion of the work.

From previous work experience, regardless of the state of the mountain, the construction method can achieve the design requirements and practical level as long as the pulling force of each pile foundation can reach 1.5T and each pile pile can reach 35T.

Photovoltaic foundation piles, in addition to Hainan Province, have not happened in other regions since the typhoon damaged the foundation piles. In the medium to long term, the weakest link of photovoltaic piles is the 25-year anticorrosion problem of galvanized parts on the ground. This is the most important aspect of photovoltaic safety. Once this problem arises, even the best underground foundation will not help. Another issue that needs attention is the loss of waterproof soil, especially after heavy rains in the mountains, it is easy to form mountain torrents in a short time, and it is easy to cause damage to the pile foundation. At the beginning of construction, we must do a good job of flushing and impacting against rainwater. Necessary areas can be mixed cement pier and tailblow construction process to ensure the safety of the project.

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