Abstract: The present application relates to the technical field of architectural engineering. Disclosed are a slab joint leakage-proof structure of a prefabricated roof panel, a prefabricated roof panel and a prefabricated roof panel system. The slab joint leakage-proof structure comprises a first leakage-proof layer. The first leakage-proof layer comprises two flexible structures which abut against each other and are arranged at the joint of a main rib on the long side of the roof panel and a main rib on the long side of an adjacent roof panel. Either of the flexible structures comprises a main body portion sealably attached to the main rib, and at least one protruding portion which is fixedly disposed on the main body portion, protrudes and extends into the joint, and can tightly abut against the other flexible structure. The protruding portions of the two flexible structures can enclose an air cavity layer sealably isolated from the outside.

Abstract: The present application relates to the technical field of architectural engineering. Disclosed are a slab joint leakage-proof structure of a prefabricated roof panel, a prefabricated roof panel and a prefabricated roof panel system. The slab joint leakage-proof structure comprises a first leakage-proof layer. The first leakage-proof layer comprises two flexible structures which abut against each other and are arranged at the joint of a main rib on the long side of the roof panel and a main rib on the long side of an adjacent roof panel. Either of the flexible structures comprises a main body portion sealably attached to the main rib, and at least one protruding portion which is fixedly disposed on the main body portion, protrudes and extends into the joint, and can tightly abut against the other flexible structure. The protruding portions of the two flexible structures can enclose an air cavity layer sealably isolated from the outside.

Abstract: A lightweight multifunctional supporting device and a method for calculating a jacking force thereof. The lightweight multifunctional supporting device includes a supporting frame and a jacking device, the jacking device includes a screw rod and a jacking seat, the screw rod (21) is provided vertically and is fixed on the supporting frame, the jacking seat is provided thereon with a vertical threaded hole and is provided with a lateral rotation rod, and the screw rod is in threaded connection with the threaded hole. The method for calculating the jacking force of the supporting device above.

Abstract: A lightweight multifunctional supporting device and a method for calculating a jacking force thereof. The lightweight multifunctional supporting device includes a supporting frame and a jacking device, the jacking device includes a screw rod and a jacking seat, the screw rod (21) is provided vertically and is fixed on the supporting frame, the jacking seat is provided thereon with a vertical threaded hole and is provided with a lateral rotation rod, and the screw rod is in threaded connection with the threaded hole. The method for calculating the jacking force of the supporting device above.