As shown in Figure 4, the mechanical connecting part 5 includes a bearing and connecting end 6 or a bearing and connecting cavity 7, the bearing and connecting end 6 is generally higher than the surface of the concrete main body 2, and the bearing and connecting cavity 7 is generally set to be flush with the surface of the concrete main body 2. The bearing and connecting end 6 or the bearing and connecting cavity 7 is arranged to serve as a connection port for connecting upper and lower walls when the prefabricated wall 1 is assembled, and the bearing and connecting end 6 and the bearing and connecting cavity 7 are provided with corresponding interface structures which may be used for connection according to specific connection manners. For example, if the corresponding fastening components are clamped with them according to the design requirements, clamping grooves or blocks for clamping are arranged on the bearing and connecting end 6 and the bearing and connecting cavity 7. It may also be arranged as threaded connection or pin-key connection http://prntscr.com/y5cbyh http://prntscr.com/y5cz1b

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