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现在采用的一般平板预埋件,在预埋件的板下易形成气泡和蜂窝。这大大降低了预埋件的耐久性和钢筋混凝土结构的使用年限。经改进的预埋件是由压轧成圆柱形的板组成。板的弯曲半径R与板缘弯起的高度h的比值以20～60为宜。过去采用的平板预埋件,在板下常形成深3～15毫米、面积达板总面积10～20%的蜂窝。这是因为在浇灌混凝土时,上升的混凝土料堵塞住板的边缘,使板中央存留的空气不能排出,结果形成气泡。改进的预埋件克服了这一缺点,在板下只留下直径3～7毫米的较小气泡,若经过强烈振捣,气泡可完全排出,板下不再有蜂窝。它的耐久性可提高
The conventional flat plate embedded parts are now used to form bubbles and honeycombs under the boards of the embedded parts. This greatly reduces the durability of embedded parts and the service life of reinforced concrete structures. The improved embedded parts consist of plates that are rolled into a cylindrical shape. The ratio of the bending radius R of the plate to the height h of the bent edge of the plate is preferably 20-60. In the past, flat plate embedded parts used in the past often formed a honeycomb with a depth of 3 to 15 mm and an area of 10 to 20% of the total area of the plate. This is because when the concrete is poured, the rising concrete material blocks the edge of the panel, so that the air remaining in the center of the panel cannot be discharged, resulting in the formation of air bubbles. The improved embedment overcomes this drawback by leaving only a small bubble of 3 to 7 mm in diameter under the plate, and if strongly vibrated, the bubble can be completely discharged and there is no more honeycomb beneath the plate. Its durability can be improved