Jet grouting is difficult due to geological reasons.
In the construction, filtration, sedimentation and recovery are mostly used to adjust the concentration before reuse.
(3) Add aggregate to the slurry.
(2) Properly reduce the nozzle diameter.
1.3 cavity treatment (1) after jet grouting, continuously or intermittently inject slurry into the jet hole under static pressure until the mixed slurry in the hole solidifies and does not sink.
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Usually, the reason is that the particle size of the reinforced soil layer is too large and there are many pores.
(4) After the mud adding ball is closed, continue to spray normally.
The following measures can be taken: (1) increase the slurry concentration and continue to spray from 1.1 to about 1.3.
(5) After pouring cement mortar, replace the cement slurry in the hole with clay slurry, and continue to spray normally after the hole is filled.
There is no slurry or a small amount of slurry.
Due to the mixture of formation particles and slurry contained in the slurry emission, there is no suitable method for the separation and recovery of cement in the slurry emission at present.
(3) Properly speed up the lifting speed.
The following measures can be taken: (1) increase the spraying pressure.
Prevention and treatment of common problems in the construction quality of high-pressure jet grouting pile 1.
The proportion of slurry shall be non shrinkage and expansive material.
1.2 the excessive discharge of slurry is usually related to the maladjustment of the effective spraying range and the spraying volume.
(2) After the completion of jet grouting, the second static pressure grouting shall be carried out to the pores between the solidified solid and its superstructure.
(2) Pour clay slurry or fine sand and medium sand, and continue normal spraying after the pores are filled.
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