| 摘要 |
PROBLEM TO BE SOLVED: To provide a back-filling device which brings about a reduction in the number of feed pumps and construction costs by creating a filler, which is mixed at a prescribed mixing ratio in each of a plurality of branched feed pipes, and injecting the filler in prescribed quantity into a void from a plurality of injection places at a time. SOLUTION: Characteristically, the back-filling device 1 comprises: a main- material feeding pump 21 for feeding a main material into a main-material feeding pipe 2 in which a plurality of main-material branch pipes 20 are formed; a sub-material feeding pump 31 for feeding a sub-material into a sub-material feeding pipe 3 which is formed with a plurality of sub-material branch pipes 30 communicating with the branch pipes 20, respectively; a flow-rate control means 34 for controlling a flow rate of each of the branch pipes 30 in accordance with a flow rate of each of the branch pipes 20; a siamese fitting 24 which makes the main material merge with the sub-material so as to mix them with each other; a plurality of injection pressure sensors 5 for measuring injection pressure inside a tail void T in the case of each of the branch pipes 20; and a plurality of injection valve control means 6 for stopping the injection of the filler in the case of each of the branch pipes 20.
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