With the gradual development of the wind power industry, the scale of wind power development in the northern region with better wind resources in my country has exploded, gradually exceeding the range that the northern power grid structure can bear. more serious. In order to cope with the abandonment of wind, major wind turbine manufacturers have vigorously developed low-wind-speed wind turbines. With the maturity of low-wind-speed technology, various wind power investors have begun to change their strategies from “going north” to “going south”, starting the southward expedition. In just a few years, wind power has blossomed everywhere in the south.
Compared with the northern region, due to the complex geographical and climatic conditions in the south, there are also differences in the design of wind farms in the north and south. For example, heavy rainfall, strong thunderstorms, freezing disasters, and frequent geological disasters in the south will have a lot of influence on the design of wind farms, which are rarely seen in the design of wind farms in the north. In this issue, the editor will talk to you about the differences in road design between north and south wind farms.
First of all, let’s talk about the difference of the approach road. The so-called approach road is the road from the exit of the expressway to the entrance of the wind farm. This section of the road is mainly designed by using the original road, supplemented by partial reconstruction.
Due to the relatively flat terrain and relatively good geographical conditions, the roads in the north are characterized by “wide”, “flat” and “straight”. The design conditions can be met by partial transformation. Moreover, the choice of approach road will also have many options to choose from.
The geographical conditions in the south are much more complicated than those in the north, and the characteristics of the roads are “narrow”, “steep” and “curved” can also be clearly reflected. The choice greatly increases the difficulty. The reconstruction of such a road will lead to a great increase in the amount of engineering, and even involve demolition and other matters. Therefore, in the south, the selection of long access roads for wind farms is particularly important. It is likely that many sets of schemes have been made. After the final site survey, only one or two sets are feasible. This situation is rare in the north.
Secondly, let’s talk about the difference of on-site inspection. On-site inspection is an indispensable part of road design.
The mountains in the north are continuous, the integrity is strong, and the mountains are relatively slow. In the south, many mountains are scattered and the mountains are very steep. The vegetation in the south is much higher than that in the north, which undoubtedly has a great impact on the field investigation and measurement. The time for road site survey and measurement of wind farms in the south is mostly longer than that of wind farms of the same scale in the north, and much longer.
Let’s talk about the differences in road design in the field. The roads in the field account for most of the road design of the wind farm, mainly including the main line of the road in the field and the branch roads connecting the wind turbines.
Due to the climate, the precipitation in the south is greater than that in the north, and the water content of the soil is also higher than that in the north. This situation is not obvious when it is at the fan point on the top of the mountain, but at the foot of the mountain, the water content of the soil will increase significantly, and the groundwater level is very shallow. Therefore, in the design, local replacement and other methods will be adopted to ensure the stability of the roadbed in the road section with high water content, and the thickness of the road surface in the north will be relatively increased.
In the north, due to its low precipitation, low soil water content, and deep groundwater depth, conventional road practices can be used, and the roadbed will only be treated in special circumstances.
Heavy rainfall in the south led to the importance of drainage in the design of the southern road. Wind farm road drainage design is further divided into road drainage and drainage ditch. The road surface generally relies on its own cross slope for drainage. Therefore, compared with the north, the angle of the cross slope will be larger than that of the north design due to the large amount of precipitation in the south, so that the drainage can be faster. At the same time, local hardening is adopted in the road sections with large longitudinal slopes to avoid road erosion caused by a large amount of rainwater.
The road drainage ditch of the wind farm in the north generally adopts the natural drainage ditch. In the south, due to the large amount of precipitation, the natural drainage ditch is easy to be washed away. Therefore, it is recommended to use the masonry rubble drainage ditch in the design. Avoid the erosion of drains caused by heavy rainfall or the collapse of the subgrade caused by water seepage under the subgrade.
Finally, let’s talk about the difference in the transportation mode of wind farms in the north and south. The main function of roads is to transport equipment. Large-scale equipment in wind farms needs to be transported from manufacturers to wind farms by transport vehicles.
In the north, conventional flatbed trailers are often used to transport large equipment such as fan blades, and special transportation methods are used in conjunction with complex conditions.
Due to the complex geographical conditions in the south, special transportation methods are generally used. The use of special transportation methods can reduce the requirements of equipment on road parameters. The design reflects the reduction of engineering volume; of course, the cost is higher than that of conventional transportation methods, but comprehensive Considering the overall feasibility and economy, special transportation methods have more advantages than conventional transportation methods in the south.
Post time: Dec-26-2022
