It is very difficult to study the rule of propagation of piling noise if we use general physical model because there are too many unknown factors involved in the process of propagation.
打桩施工过程中噪声的传播规律的研究，如果建立在一般物理模型基础元上。势必会由于实际传播过程中的未知因素过多而难以深入进行。
A valid Construction Noise permit issued by the Environmental Protection Department is required for the carrying out of percussive piling during the permitted hours.
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。
Compared with normal hammers, it has a lot of advantages, such as lower noise, no exhaust gas, less vibration, high piling energy and better dynamics characteristics.
与传统打桩锤相比较具有噪声小、无污染、振动小、打击能量高等优点，符合环保要求，并具有良好的动力学特性。
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