Construction method of stage diversion Cofferdam for Sluice Project
水闸工程分期导流围堰的施工方法

摘要

在拟建闸址的上游和下游处施工一期围堰，并排出所述一期围堰内部的积水；在所述一期围堰内部进行地基处理、基坑开挖，并施工一期闸室结构及一期消力池结构；在所述一期消力池结构的底板上的预设位置处预埋多个定位管，多个所述定位管设置在相对的两侧；施工二期的纵向围堰：在所述底板上铺设防水布，并在所述防水布上对应所述定位管的位置处打设钢管桩；在两侧的所述钢管桩的内侧分别设置水平向的围檩；在两侧的所述围檩的内侧分别设置竖直向的挡水板；在两侧的所述挡水板之间填充袋装土，并将两侧的所述围檩对拉锚固；施工二期的横向围堰，并使所述横向围堰与所述纵向围堰相衔接，形成二期围堰；拆除所述一期围堰，在所述二期围堰内部进行地基处理、基坑开挖，并施工二期闸室结构及二期消力池结构；拆除所述二期围堰，使河道恢复全断面通水。

Abstract

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.