CONSTRUCTION SLUDGE CARRYING-OUT DEVICE

PROBLEM TO BE SOLVED: To provide a construction sludge carrying-out device capable of conveying construction sludge of high concentration at a low cost without installing a pumping device or the like in a tunnel so as not to be an obstacle to the movement of persons and other equipment and materials in the tunnel, and of converting the construction sludge into properties easy for classifying soil grains outside a pit. SOLUTION: The construction sludge discharged from the tip of an excavator 1 is temporarily stored in a construction sludge receiving tank 3 connected to an airtight storage tank 6 installed in a vertical shaft, by a long conveying pipe 2. Air pressure in the airtight storage tank 6 is decompressed by a decompression device 7 disposed on the ground, to suck the sludge in the conveying pipe 2 by the negative pressure. Dilution water is introduced in the airtight storage tank 6 to lower the concentration, and the sludge is fed to a solid-liquid separating device 8 on the ground by a submerged pump 6d.