Foundation pit side slope Larsen steel sheet pile reinforcing construction method

The invention relates to the technical field of foundation pit side slope reinforcement, and discloses a foundation pit side slope Larsen steel sheet pile reinforcement construction method which comprises the following steps: measuring and positioning: measuring and paying off the axis of a steel sheet pile by a measurer, inserting a positioning steel bar on the ground to mark a starting point, marking the axis by using a measuring rope, and inserting and driving the positioning steel sheet pile. According to the construction method for reinforcing the Larsen steel sheet pile on the side slope of the foundation pit, the pit bottom of the foundation pit is reinforced by adopting the three-pipe method jet grouting pile at the initial stage, so that the construction strength of the foundation pit can be improved, and the potential safety hazard caused by a silt layer in the construction process of the Larsen steel sheet pile is met; the stability of the Larsen steel sheet pile unearthed ramp can be effectively i