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长洲船闸上游引航道口门区剩余的5个潜坝需全部水下施工,且水位基本维持在设计正常蓄水位20.60m(枯水期)。桩基护筒采用埋设法施工,护筒顶部高出施工平台(高出正常水位4m)30cm,护筒内径比桩径大200mm～400mm。护筒埋设深度为到风化岩层,护壁泥浆的主要性能采用比重1.2～1.4,黏度18″～22″。
The remaining five submarines in the port area of the upstream approach channel of Cheung Chau Locks shall be fully under-constructed and the water level shall be maintained at a normal designed water level of 20.60 m (dry season). Pile foundation tube buried construction method, top of the casing above the construction platform (higher than the normal water level 4m) 30cm, casing diameter greater than the diameter 200mm ~ 400mm. The buried depth of the casing is up to the weathered rock layer. The main properties of the retaining wall mud are the specific gravity of 1.2-1.4 and the viscosity of 18-22.