Shear wall structural member for underground diaphragm wall and construction method

The invention discloses a shear wall structural member for an underground diaphragm wall and a construction method. The shear wall structural member comprises linear, L-shaped, T-shaped and cross-shaped member bodies. According to different positions, the member bodies of different forms are selected and arranged to form a discontinuous outline of the diaphragm wall. Post-cast members are arrangedbetween continuous wall members poured in a framing mode, and at the moment, straight thread connectors connected with steel bars of the post-cast members are reserved for the continuous wall members. Firstly, an underground diaphragm wall vertical structural member is constructed, and main body structure laminate is formed at the top of the diaphragm wall through pouring. After the strength of the main body structure laminate reaches a certain strength, a main body structure is constructed synchronously up and down, and over-ground forward construction and underground layer-by-layer construction are synchronously pe