By erecting grillage and shotcreting est.

The application of high pressure jet grouting technology in pile foundation construction;

According to theoretical analysis and practice of the grouting project,the grouting theory falls roughly into four categories:permeation grouting,hydrofracture grouting,compaction grouting and jet grouting.

In this paper, the engineering geological condition of crossing the Changjiang River Tunnel along the Beijing Shanghai high speed railway is studied, and merits and demerits of ground treatment methods of all kinds are checked and compared, and jet grouting plan is put forwar

The design,construction and result inspection were introduced through a example of project to reinforce sand-drift layer in excavated holes of grouting piles by rotating jet grouting technology.

If the SPT result is unqualified, churn grouting or tubular pile can be adopted for consolidation, tubular pile for 30-50 hitting times SPT, churn grouting combined with add tubular pile for hitting times lower than 30.

The project has adopted the artificial filling pedestal pile measure with the following methods in succesion namely: 1, the steel tube settling method; 2, the precast reinforced coecrete tube settling method; 3,the special fluid grab cleaning and 4,high pressure churn grouting seal method,etc.

The application of rotary jet grouting to the soft ground area in China has solved not only problems of high water content,high compressibility and olw strength,but also problems in Tanggu area where soft ground is under a cover of hard shell.

43 of the main bridge of Dongsha Bridge,this paper presents the construction technology of rotary jet grouting of the common Portland cement mortar and sodium-silicate cement.