| 摘要 |
PROBLEM TO BE SOLVED: To provide a nozzle for fiber-contg. spraying cement concrete that capable of reducing rebound rate. SOLUTION: This nozzle for fiber-contg. spraying cement concrete has a throttle difined by d/D=0.3 to 0.8 and L/D=1.0 to 3.0, for which (d) is the diameter of a discharge port, D is the diameter of the feed port and L is the length of the throttle. Further, an accelerator can be incorporated. Consequently, such materials as a coarse aggregate and fibers used in the fiber-contg. cement concrete and not uniformly mixed in a forced-feed pipe are uniformly mixed, and the rebound rate is decreased.
|
