Horizontal supporting structure for deep foundation pit protection

The utility model relates to the technical field of deep foundation pit construction, in particular to a horizontal supporting structure for deep foundation pit protection. The horizontal supporting structure comprises a top beam, a ring beam, a force transmission assembly, stand columns and row piles. The stand columns are circularly arranged in the foundation pit to form a foundation pit inner side supporting and retaining structure. The row piles are arranged along the edge of the foundation pit to form the foundation pit side wall protection structure. The crown beam is connected with the row piles. The ring beam is connected with the stand column. The top beam is connected with the ring beam through a force transmission assembly. A first force transmission box in the force transmission assembly is connected with the top beam. And a channel for placing a jack is arranged between the first force transmission box and the second force transmission box. A base of the jack is connected with the first force tra