| 摘要 |
<p>PROBLEM TO BE SOLVED: To more effectively suppress the occurrence of turbidity in surrounding waters in the earth work using a tremie pipe.SOLUTION: A drop path of earth and sand 20 is defined by a tremie pipe 10, and the earth and sand 20 dumped from a hopper 14 provided at the top part of the tremie pipe 10 are discharged from the lower end part 16 of the tremie pipe 10 to a water bottom, without the occurrence of turbidity due to scattering in the water. A range from the lower end 16 to a predetermined height H is constituted as a deformable part 22 freely deformed by receiving an external force. Even when the tremie pipe 10 is rolled with the rolling of a workboat 12 and the lower end 16 of the tremie pipe 10 collides with the water bottom, the deformable part 22 constituting the lower end 16 of the tremie pipe 10 is freely deformed and prevents breakage. Accordingly, the lower end of the deformable part 22 can be brought close to the water bottom GL for dumping the earth and sand as much as possible, and can dump the earth and sand 20.</p> |
