This paper introduces the main manufacture technologies and sinking method of large caisson.

Aiming at soft foundation soil,this paper emphasizes on quality control of large caisson constructions.

Combining the prefabrication of caisson for gravity quay in Dachanwan,Shenzhen,this paper details the plan choice,formwork design and construction,reinforced concrete construction and existing problems of large caisson prefabri- cation.

With the newly renovated barge, large caissons of 3 000 t were successfully launched for the construction of two contain.

The application of large caisson in Nansha Port Area Phase I Project of Guangzhou Port and the construction technology are introduced.

Discussion on fabrication technology of large open caisson;

Taking the SB pump room well sinking at Shanghai Pudong as engineering background, close up photogrammetry has been applied to measuring the displacements in the process of large scale well sinking at first by establishing the digit PHOTO analysis system.

Close up photogrammetry was applied to measuring the displacements of all the process of large scale well sinking by establishing visual digit close up photogrammetry system based on the PHOTO measuring analysis system and Auto CAD and Matlab software.

The deposit type of the Side lead zinc copper deposit in Guiping city is thought to be hydrothermal deposition type lead zinc copper deposit based on the research of the regional geological background,geological characteristics of the deposit,mineral assemblage,texture and structure,ore source of the deposit.