Based upon analysis of the reasons caused the cracks in mass concrete of piers in Wujiawan Bridge works practical cooling measure utilizing circulating cooling water pipe is proposed to avoid concrete cracks in construction.

This paper based on the 4 kinds of general cooling measure in summer greenhouse: openings on the roof, pad-and-fan, inner sunshading and outside sunshading, when it uses respectively, the change of the environment o.

Discussion of dropping water construction in the open dredging process to the underground;

And now it has been adopted in crossing the existing subway structure,bridges and buildings,and construction method,advancing support,dewatering and monitoring measurement have greatly developed.

In this paper,a practical example is analysed to show the effect of instantanous settlment induced by dewatering of a deep foundation pit construction.

During excavation in deep foundation pit,the surface subsidence caused by dewatering construction is a important factor to affect engineering safety.

Taking the construction of Qingnian Avenue Station as example,the author presents such measures as the surface treatment of the utility pipelines,the control of the construction settlement and the advance ground consolidation that are taken during construction in order to protect the utility pipelines and to guarantee the construction safety.