Construction method for accelerating cutting of waist beam in foundation pit supporting concrete

The invention relates to a construction method for accelerating cutting of a foundation pit support concrete inner waist beam, belongs to the technical field of building construction, and aims at solving the problem that in the construction process of high-rise buildings in coastal areas, the construction cost is reduced due to the fact that steel pipe piles and steel sheet piles are combined together through lock catches to form a support structure, and the soil retaining and water stopping effects are achieved. Soft soil deep foundation pit supporting is really a challenging technical problem. Soft soil has lower shear strength and higher compressibility, so that the strength and rigidity of a supporting structure are difficult to meet the requirements, and the supporting stability becomes a key problem. And meanwhile, the rheological property and the space-time effect of the soft soil also have obvious influence on the deformation of the deep foundation pit, so that the deformation control difficulty is in