In view of particularity of the Beita Lake aqueduct, which crosses Tanglai channels, the two-way prestressed technology is adopted,and after sidewalks in large span structures of aqueduct is prefabricated and hoisted,secondary floor is poured in design and construction plan.

It makes a brief introduction to option section of large-span aqueducts of irrigation channel in Ningxia,hydraulic calculation,aqueduct shell two-way prestress design,sidewall precast lifting,aqueduct pier,support and bored pile foundation design,precast and cast-in-situ construction control,etc.

A look into the future of China s civil engineering activity and prestress technology in the 21st century;

Application of prestress technology to lateral coal bunker engineering of thermal power plants

The large span beams adopt bonded prestress technology,and the floors adopt non-bonded prestress technology.

In order to control concrete cracks due to thermal stress in large-sized concrete structure,displacement and push reaction in arch structure,pre-stress technology has been used in all individual sports buildings and the circular platform to connect them.

Great development has taken place in the connection technology of thick rebar in recent 20 years while pre-stress technology has been applied to a lot of large projects.

This paper states of the development and application prospect of high-strength concrete and wire, strand and pre-stress technology in the field of bridge engineering .

According to the problems of earlier strength of concrete,quality of prestressing duct,tension technology of overlong tendon,application of flat anchorage,the effect of anchorage size and slice length on the anchorage quality,this paper conducts a great deal of corresponding investigations and analysis,and gives some advices for prestressing technology in .

Since the reform and opening up period,the prestressing technology in our country has been advanced by leaps and bounds.