Improving method for open caisson sinking construction in geology of sludge layer

Abstract

The invention relates to an improving method for open caisson sinking construction in geology of a sludge layer. Sinking stability piles are changed from cement powder spraying piles into after-drilling injection grouting pillars. Construction of the after-drilling injection grouting pillars comprises the steps that (1) site leveling is conducted, surveying and lining are conducted to determine the positions of the after-drilling injection grouting pillars, and a drill is put in a position; (2) holes are formed by drilling an open caisson with the adoption of a single spiral drill; and (3) after the holes are formed, grouting is conducted to hole bottoms, after the hole bottoms are solidified, grouting is conducted while a drill bit is lifted, the after-drilling injection grouting pillars are formed until the drill bit is retreated from the formed holes. The after-drilling injection grouting pillars are stable in structure and good in uniformity. No large chiseling height difference is generated when opposite-chiseling is conducted. The open caisson sinking process is more stable.

Description

technical field [0001] The invention belongs to the field of sinking construction of caissons, and in particular relates to an improved method for sinking construction of caissons whose geology is a mud layer. Background technique [0002] A caisson generally includes a blade foot, a well wall, an inner partition wall, a bottom seal and a roof; in general, when a caisson is constructed, the soil is continuously excavated from the well under the protection of the well wall, so that the caisson gradually sinks under the action of its own weight. After reaching the predetermined design elevation, the back cover is carried out, and the internal structure is finally constructed. [0003] At present, when the caisson is constructed under the geological conditions of the silt layer, due to the characteristics of high water content, poor bearing capacity, and small friction coefficient of the soil layer, sudden sinking, soil gushing, and excessive sinking speed are very easy to occu...

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Problems solved by technology

[0005] Aiming at the problem that in the sinking construction of the caisson whose geology is the silt layer, the uneven structure of the cement powder spray pile may cause the caisson to tilt during the sinking process, the purpose of the present invention is to provide a kind of caisson sinking method whose geology is the silt layer The improvement method of construction is to replace the sinking stabilizing piles from cement powder spraying piles with post-drilled grouting piles. This kind of piles has a stable structure and good uniformity. The sinking process is more stable

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