Embedded cavern building method

The invention belongs to the technical field of immersed tube tunnel manufacturing, and discloses an embedded cavern building method. The method comprises the following steps: designing a three-dimensional design model of a cavern by utilizing three-dimensional software; manufacturing a bottom plate and a plurality of surrounding plates which define the cavern according to the three-dimensional design model; sequentially arranging the plurality of surrounding plates on the bottom plate in a spot welding mode; welding the adjacent surrounding plates; carrying out full welding on welding seams between the surrounding plates and the bottom plate, and obtaining a cavern plate set; and placing the cavern plate set in a mounting opening of an inner panel of a steel shell, and sequentially welding the plurality of surrounding plates to the inner panel. According to the embedded cavern building method, the situation that the structure is repaired and cut due to clamping can be avoided, weldingis not prone to deformat