Question

静力压桩与柴油打桩机相比噪声究竟如何

However, in many cases the dominant noise is caused by the impact of the hammer on the pile, or the impacts between components of the hammer, so that the resulting noise level can be very similar to diesel hammers.（是在解释Hydraulic hammer）

在维基上看到这段话，很感诧异，不是说静力压桩就是因为噪音小才多在城市中用吗。

刚才我提过这个问题，不知怎么会没有了，好奇怪，被删除了？
在正面又看到说是Hydraulic press-in会是only 69dB at 23 ft.
The reaction based machines operate at only 69dB at 23 ft allowing for installation and extraction of piles in very close proximity to noise and vibration sensitive areas where traditional methods may threaten the stability of existing structures.
搞不明白这是怎么回事。Hydraulic press-in才是静力压桩？Hydraulic hammer两个还不同。

Answer 1

Hydraulic press-in是静压斗物桩。Hydraulic hammer是液压打桩锤，也属于冲击桩的种，单作用液压锤只是上升的驱动方式为液压，然后释放。双作用液压锤在下降时也使用液压加速，速度快，可以使空春液用较轻的锤森缺芯，冲击力比普通的大，一般打钢桩才用

Answer 2

静压肯定是声音比较小 ，但从进度与经济方面静压比较不经济，

Answer 3

小于60分贝