Construction method for foundation pit support

The invention relates to a construction method for a foundation pit support. Firstly, occlusion piles are arranged along the inner wall of a foundation pit and are enabled to form a closed cofferdam, and earth is excavated after the occlusion piles are constructed; secondly, a first anchor body is constructed, and a first fish belly beam tool type combination is installed; then, prestress is applied to the first fish belly beam tool type combination; then, a second anchor body is constructed; a second fish belly beam tool type combination is installed and prestress is applied to the second fish belly beam tool type combination; and finally the earth is excavated to the bottom of the foundation pit, and cushion layer concrete is poured at the bottom of the foundation pit. According to the construction method for the foundation pit support, the construction is convenient, the cost and the construction period are reduced, and the deformation of the foundation pit can be avoided. 本发明涉及种基坑支护的施工方法,首先沿所述基坑的内壁设置咬合桩，且