| 摘要 |
PROBLEM TO BE SOLVED: To provide a quick-setting concrete spraying method executed for the reinforcement of the natural ground in tunnel excavation work and stabilization of an excavated face. SOLUTION: In this quick-setting concrete spraying method, compressed air supplied through a compressed air transport pipe 14 from a compressor 7 for transporting quick-setting material from a quick-setting material supply equipment 4 to a confluence pipe 8 through a quick-setting material transport pipe 13, and compressed air supplied from the compressor 7 to a branch pipe of the confluence pipe 8 through a compressed air transport pipe 9 are adjusted so that the total quantity of both compressed air is in a range of 3-10 m3/min in the atmospheric pressure conversion value, and the quick-setting material is transported to a confluence pipe 3 via the confluence pipe 8, mixed with concrete transported to the confluence pipe 3 through a transport pipe 2 by a pump 1, and then transported to a spray nozzle 6 through a transport pipe 5 to spray quick-setting concrete to the natural ground or the like from the spray nozzle 6.
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