Accurate positioning construction method of double-wall steel cofferdam

The invention discloses an accurate positioning construction method of a double-wall steel cofferdam, which is used for the accurate positioning construction of the double-wall steel cofferdam with piers on the inclined bare rock surface and the inclined rock surface of a shallow covering layer on the river, lake or sea. The method comprises the following steps: A10, after preliminarily positioning the double-wall steel cofferdam, lowering each temporary positioning pile steel protection cylinder to the river bed rock surface; A20, temporarily fixing the temporary positioning pile steel protection cylinder and the double-wall steel cofferdam to form a hole drilling platform; A30, lowering each accurate positioning steel protection cylinder to the river bed rock surface, punching holes in the accurate positioning steel protection cylinder, vibrating and sinking the accurate positioning steel protection cylinder to the bottom of the holes, pouring plain concrete, and solidifying the plain concrete and the force