In accordance with Sanjintan Sewage Treatment project in Wuhan, this paper figures out design for the formwork frame system of the egg-shaped digesters and meanwhile, makes simulation analysis on the data during the process of the construction works.

In this paper,the Egg-shaped digesters under static load was analyzed with ANSYS software,then some fit characters for Egg-shaped digesters design were identified for improving its stress distribution performance,including its dimensions,thickness of shell and underground depth.

Seismic response analysis of egg-shaped digester-pile-soil interaction system;

Aiming to have a comprehensive grasp of the stress characteristics of egg-shaped digester and to guide practice,the static and dynamic three-dimensional finite element analyses of an egg-shaped digester,which is a special large-scale structure,were accomplished using ANSYS software.

In accordance with the construction of the egg-shaped digester tank in Wuhan Sanjintan Sewage Treatment Plant, the paper presents the main quality control measures in formwork setting, steel bar fixing and concrete casting, which are of referential value for the similar engineering.

A five-phase scheme of concrete-cast-in-site with a new developed construction procedure is firstly introduced for the egg-shaped digester tank tower in wuhan sanjintan sewage treatment plant.

The measurement of the concrete stress distribution and the circumferential deformation of the cell body in oval sludge digester of Zhangzhou water treatment plant are carried out on site.

To determine the distribution of the effective stress of the prestressing tendons in the oval sludge digester,the friction loss caused by the variable-angle heel and the duct friction coefficient are often required to be measured on site.

Considering egg-shaped digester tanks on mechanical complexity and limit of dimensions,two different prestressing methods are presented for laying prestressing tendons on longitude,latitude and 45 degree.