Advances in Constructional Engineering

Construct the first stage cofferdam at the upstream and downstream of the proposed Gate site, and drain the ponding inside the first stage cofferdam; Carry out foundation treatment and foundation pit excavation inside the first phase cofferdam, and construct the first phase sluice chamber structure and the first phase stilling basin structure; A plurality of positioning tubes are embedded at a preset position on the bottom plate of the phase I stilling basin structure, and a plurality of the positioning tubes are arranged on opposite sides; Longitudinal cofferdam of phase II Construction: lay waterproof cloth on the bottom plate, and drive steel pipe piles on the waterproof cloth at the position corresponding to the positioning pipe; Horizontal purlins are respectively arranged on the inner sides of the steel pipe piles on both sides; The inner sides of the purlins on both sides are respectively provided with vertical water baffles; Filling bagged soil between the water retaining plates on both sides, and pulling and anchoring the purlins on both sides; Construct the horizontal cofferdam of phase II, and connect the horizontal cofferdam with the longitudinal cofferdam to form the phase II cofferdam; Dismantle the first stage cofferdam, carry out foundation treatment and foundation pit excavation inside the second stage cofferdam, and construct the second stage sluice chamber structure and the second stage stilling basin structure; Remove the phase II cofferdam to restore the full section water supply of the river.

Sluice engineering; Stage diversion cofferdam; Construction method