Hall of Supreme Harmony(Taihedian)Ⅱ

The upper section is a roof of Chongyanwudianding (重檐庑殿顶, Double eaves Wudian Roof. This is the top-level palace roof in Qing Dynasty, and Wudianding is also called Sieding and Wujidian. The palace roof structure displays the rectangle, and the surface is wide and the inside is deep. The front and the back slopes meet together, this  connection is called the mid ridge. And the left and right slopes have four vertical ridges and respectively connect with the one side of the mid ridge. Chongyanwudianding is an exclusive roof structure that we can see only in Taihedian (Hall of Supreme Harmony) and Lingendian of Ming Thirteen Tombs. It is only used in imperial architectures. At both ends, two big decorations are set with 3.4 meters long and weight of 4300 kilograms. The eave corner has 10 animal sculptures. It is the only architecture has so many animal sculptures. Taihedian (Hall of Supreme Harmony) in total has 72 columns to hold the total weight of the architecture. Among the columns, the mid one is the thickest and tallest with a diameter of 1.06 meters and 12.7 meters in height. In Ming dynasty, the columns were made of Nanmu, a kind of rare wood generally from Sichuan, Guangxi, Yunan and Guizhou provinces. Pine-tree wood was used as the column after the restoration of Qing dynasty, and these woods were all from the deep mountains of northeast China.