CONSTRUCTION METHOD FOR SPRAYING CONCRETE

摘要

PURPOSE:To prevent clogging by sufficiently perform mixing, by sending compressed air in a system separate from a liquid hardening-accelerating agent while sending said agent under pressure by a pump and converging and mixing both components around an air sending passage of a spray material to spirally spray the same to the air sending passage. CONSTITUTION:A feed path 3 is connected to the emitting part 2 of a concrete pump 1 and led to the spray nozzle 4 provided to the leading end thereof. A pressure sending air adding part 5 is provided on the way of the feed path 3 and a spray material is fed to the spray nozzle 4 by an air stream by adding compressed air to said material. A liquid hardening-accelerating agent is added to the spray material during airborn feed in the feed path 3b ahead the pressure sending air adding part 5. That is, the liquid hardening-accelerating agent is sent under pressure by a pump 15 and compressed air is sent from a supply part 19 in a separate system and both of them are mixed in the periphery of the feed path 3b and spirally injected from the outer periphery of the spray material by a liquid hardening-accelerating agent adding mechanism A.