| 摘要 |
PROBLEM TO BE SOLVED: To provide a quick-setting concrete spraying method improved in dust reduction effect. SOLUTION: The quick-setting concrete spraying method is characterized in that concrete mixed with water in advance is transported pneumatically by a hose to a junction pipe where the concrete is joined with a power quick-setting material, the concrete is furthermore added with water in front of the junction pipe, and the power quick-setting material is supplied to the concrete from a branch pipe to the junction pipe where the quick-setting concrete is produced and sprayed through a nozzle. Preferably, the amount of water added to the concrete is set to 20 to 200 pts.wt. per 100 pts.wt. of the powder quick-setting material 100 and the total quantity of compressed air transported pneumatically to the nozzle is set to 5 to 30 m<SP>3</SP>/min in terms of an atmospheric pressure conversion value. COPYRIGHT: (C)2007,JPO&INPIT
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