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采用先张法生产预应力板类构件的长线台面经过长时间使用,表面变得凹凸不平,改加一层素混凝土或采用预应力滑动台面后,由于大多数单位采用简易墩式台座或因预埋螺栓锈蚀严重,仍无法继续使用,需进行台座的改造。选择台座类型既要考虑经济,便于施工,还要考虑几年后台面破损需加厚台面的需求。经过对比,选择了矩形换埋式台座,见图1。埋置深度按下式计算,计算简图见图2。
Long-term use of the pretensioned sheet to produce pre-stressed sheet members has been used for a long time. The surface becomes uneven. After adding a layer of plain concrete or adopting a pre-stressed sliding table, most units adopt a simple pier type or because of pre-stressing. The corrosion of buried bolts is serious and it is still impossible to continue to use them. It is necessary to reform the pedestal. Choosing the type of pedestal is not only economic but also convenient for construction. It also needs to consider the need for thickening the countertops after several years of surface damage. After comparison, the rectangular burying pedestal was selected, see Figure 1. The buried depth is calculated by the following formula, and the calculation diagram is shown in Figure 2.