沈井基礎是以沈井法施工的地下結構物和深基礎的壹種型式。它由刃腳、井壁、隔墻、井孔、凹槽、射水管組和探測管、封底混凝土、頂蓋部分組成。首先在地表制作成壹個井筒狀的結構物，然後在井壁的圍護下，從井內不斷挖土，使沈井在自重作用下逐漸下沈，達到預定設計標高後，再進行封底，構築內部結構。廣泛應用於橋梁、煙囪、水塔的基礎;
Open caisson foundation is a type of underground structure (sunk by the means of drop shaft) and deepfoundation. It consists of a cutting edge, (shaft wall), partition wall, (well hole), groove, (a group of discharge jets and an exploring tube), (bottom closing concrete), (and top cover). (A shaft shaped structure is firstly made into on the surface of the earth), and then (surrounded and protected by the shaft wall, the open caisson is made sinking little by little under the action of its dead weight) (by the soil’s being continuously dug out of the well) and (after it arrives at the preconcerted design elevation, the bottom can be closed and the inside structure can be built).
首先，本文將工程概況進行介紹，對當地水文地質進行分析。
First of all, (in this paper, an overview of the project is introduced) and the local hydro hydrogeology is analyzed).
其次，本文對當地的環境編寫施工方案，介紹其施工工藝；分析沈井施工中的質量通病，如何控制質量通病的發生。
Secondly, (a construction scheme is worked out on the local environment and its construction technology is introduced; also it is necessary to analyze) the quality defects in construction of an open caisson and how to control the occurrence of common quality defects.
再次，本文沈井施工工藝前期準備工作詳細說明；對如何下沈、下沈需註意事項進行詳細說明。
Thirdly, (the construction technology of caisson preparatory is elaborated; and how to sink and the dos and don’ts of sinking are also paid attention to in detail).
最後，對沈井基礎在實際應用中的技術和經驗加以體會，對經濟效益進行分析。
Finally, (the paper tastes the technology and the experiences of open caisson foundation in the practical application andanalyzes the economic benefit.)