| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method which effectively reduces installation noise of a steel pipe pile. <P>SOLUTION: A cylindrical block 14 internally loaded with sound absorption means 18 having air permeability, having an external surface which does not inhibit sound propagation to the sound absorption means 18, is disposed at, or in the vicinity of, an opening end in a steel pipe pile 10. The vibration propagating through the air inside the steel pipe pile 10 resulting from the impact during installation of the steel pipe pile 10 with a hydraulic hammer 12 passes through the cylindrical block 14, so that the amplitude of the vibration at the opening end of the steel pipe pile 10 is efficiently attenuated, stimulating noise reduction. A cylindrical block 16 internally loaded with sound absorption means 20 having air permeability, having an external surface which does not inhibit sound propagation to the sound absorption means 20, is disposed at an intermediate part inside the steel pipe pile 10. The vibration propagating through the air inside the steel pipe pile 10 passes through the cylindrical block 16, so that the particle velocity of a vibration medium at the intermediate part inside the steel pipe 10 is efficiently attenuated, stimulating noise reduction. <P>COPYRIGHT: (C)2013,JPO&INPIT |
