Connecting device for foundation pit supporting inner support and self-adjusting axial force control mechanisms

The invention discloses a connecting device for a foundation pit supporting inner support and self-adjusting axial force control mechanisms, and belongs to the technical field of foundation pit supporting. The connecting device comprises M limiting grooves formed in the foundation pit supporting and the self-adjusting axial force control mechanisms with the same number as the M limiting grooves, and each self-adjusting axial force control mechanism comprises a first air chamber embedded in the corresponding limiting groove, a second air chamber connected with the inner support, a partition block correspondingly connected with the first air chamber and the second air chamber, a first elastic assembly and a second elastic assembly; the partition blocks are slidably arranged in the limiting grooves; the first elastic assemblies are correspondingly connected with the foundation pit supporting and the separation blocks, and the first elastic assemblies are located in the first air chambers; and the second elastic