至于撞击式打桩工程，则禁止在限制时间内施工；即使在日间进行，也须领有许可证。
Percussive piling work is prohibited during the restricted hours and requires a permit even during daytime.
如须于核准时间内进行撞击式打桩工程，必须事先取得由环保署签发的建筑噪音许可证。
A valid Construction Noise permit issued by the Environmental Protection Department is required for the carrying out of percussive piling during the permitted hours.
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