| abstract |
(57) [Summary] [Purpose] The quick-setting power of a quick-setting agent used as an aqueous solution, Provided is a thin spraying method that utilizes both of the advantages of both the initial long-term strength development performance of the powder quick-setting agent and the powder. As a result, the amount of the quick-setting binder used as a whole is reduced, and even in a narrow work space such as a small-section tunnel, the rebound is reduced to improve the work environment, and the strength after the spraying is increased to increase the strength of 2 to 4 cm. Even if it is thin, the ground and bedrock after excavation can be stabilized. [Structure] In the thin spraying method applied to excavation grounds and slopes such as tunnels and headraces, the mortar is pumped into the piping. A slurry quick-setting agent such as calcium aluminate and a liquid quick-setting agent such as an aqueous alkali aluminate solution or an aluminum sulfate aqueous solution are sprayed while being independently joined. |