某厂房长24m，宽20m，屋盖采用22m长预应力V形折板，共9折，其中第三折吊装就位后，发现板面裂缝，经采用“灌胶-增强”法处理，效果较好。1裂缝原因如图1所示，裂缝a长约14m，宽约02mm；裂缝b长约135m，宽0．1－02mm。裂缝a是在折板出池翻身立起时，因起吊速度快而产生较大吸 A factory building is 24m long and 20m wide. 22m long prestressed V-shaped flaps are used for the roof, a total of 10% discount. After the third folding hoisting is in place, cracks on the board surface are found and treated with the “rubber-enhanced” method. better. 1 The reason for the cracking is shown in Fig. 1. The crack a is about 14m long and about 02mm wide; the crack b is about 135m long and 0.1-02mm wide. The crack a is caused by the fast lifting speed when the flap is turned upside down.