Construction method of shear key for immersed tunnel

The invention relates to the technical field of tunnel construction, and particularly relates to a construction method of a shear key for an immersed tunnel. The construction method comprises the following steps that S1, a base plate used for mounting the shear key is machined, and a connecting sleeve is welded to the base plate; S2, a first connecting through hole aligned with the connecting sleeve is formed in an inner partition plate of a tunnel steel shell; S3, one end of a first connecting screw penetrates through the first connecting through hole to be in threaded connection with one endof the connecting sleeve; S4, a second connecting through hole aligned with the connecting sleeve is formed in the shear key; S5, one end of a second connecting screw penetrates through the second connecting through hole to be in threaded connection with the other end of the connecting sleeve, so that one side of the shear key is attached to the side, deviating from the inner partition plate, ofthe base plate; S6, a gap