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19.5MW Solar Plant Arranges Panels on Slopes (page 2)

Steel molds improve foundation accuracy, shorten construction time

2014/03/08 22:26
Shinichi Kato, Nikkei BP CleanTech Institute
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The Daiwa House Group said it has almost established the optimum scheme for mega-solar power plant construction and the style of power generation business in accordance with different business scales and landowners, through various solar power plant approaches (See related article). From now, the group will appropriately leverage such a lease method as this.

Response according to land, surrounding environment

When installing the power generation system, efforts were made in accordance with the land and the surrounding environment. For example, the 1.5MW and 1.9MW output large-scale solar power plants that already started power generation are facing housing areas and roads (Fig. 2). Hence, trees were planted at the east and south ends of the sites so they can lower the risk that the solar panels' reflection might affect the housing areas and the cars driving on the roads (Fig. 3).

A regional reservoir for water discharge is included in the 1.5MW and 1.9MW capacity large-scale solar power plants (Fig. 4). By re-establishing this reservoir, Daiwa House Industry could install more solar panels in the area to the north of the reservoir. As a result, more solar panels with an output of about 200kW were set up (Fig. 5).

A variety of instruments are utilized for management and maintenance with water faucets and surveillance cameras set up as well as solar radiation sensors attached in two positions in each plant. Of the instruments, the surveillance cameras were set up by Sohgo Security Services Co Ltd (ALSOK) and the Daiwa House Group. Daiwa House Industry jointly built a security system for the mega-solar power plant with ALSOK, which it partners in the area of security systems for its integrated housing business.

Concrete foundation easy to evenly set up on slopes

What was unique about the construction of this mega-solar power plant was the concrete foundation that was evenly set up in accordance with the sloping ground. At the 16.0MW output mega-solar power plant under construction, in particular, the land slopes down toward the east (Fig. 6).

Daiwa House Industry was required to build concrete foundations with high accuracy and low cost on such land. To line the solar panels at the same height on land sloping down from the east toward the west, concrete bases to determine the height were constructed first in the ground at the east and west ends and some points between them in each row of the solar panels (Fig. 7).

As the concrete bases are solidified, elongated concrete foundations are formed on them in an east-west direction. Given the even height of the concrete bases in the ground, elongated concrete foundations stretching east to west, whose vertical heights are parallel, are completed by pouring concrete into metal molds placed like a bridge over the concrete bases (Fig. 8).

Generally speaking, most concrete foundations at mega-solar power plants stretch south to north and are combined with a post that holds the upper parts and the reverse-sides of solar panels. This is because accuracy can be more easily secured for various reasons including the short length of the concrete foundation.

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