| 摘要 |
PROBLEM TO BE SOLVED: To enable sure cavity filling and prevent leakage from the cracks or the like of a shaft wall by mixing cement milk or cement air milk and bentonite milk to be injected to a cavity part in a plastic state. SOLUTION: In order that a cavity part generated in a tunnel lining rear face part is repaired, cement milk or cement air milk, is prepared as A-liquid, bentonite milk is prepared as B-liquid, they are injected from branch pipes 11, 12 of a branch pipe 10, and mixing is performed by the mixing wing 21 of a mixer 20 through a merging pipe 13 to be injected to the cavity part. The mixing ratio of the A-liquid and the B-liquid is made (1:1)-(1:2.5), and the flow value of the grout is controlled in 140-200 mm to modify the grout to a plastic state so as to inject it. In addition, an amount of the foam-mixing of cement air milk is preferably 60 vol.% or less of the whole amount of the grout. Thereby sure cavity filling is enabled and the leakage of the grout from the cracks or the pin holes of a shaft wall can be prevented.
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