城市建筑施工Y型声屏障设计分析.doc

摘要 建筑施工噪声对人类的危害是多方面的，对人的影响主要表现为损伤听力、干扰睡眠和交谈、对人体的生理和心理产生影响，另外对建筑物和设备也会产生一定影响。为了减弱建筑施工噪声带来的影响，须采用降噪处理方法。 本次环境噪声控制工程课程设计主要是针对城市建筑施工声屏障的设计。通过设计声屏障的长度、高度等，计算绕射声衰减、吸声降噪量等，并根据声屏障的选型和材料，选择最佳的形状和材料达到最好的降噪效果。为使降噪效果更佳明显，配以吸声材料。本次课程设计针对此设计了一个Y型声屏障，双层1.5厚钢板（中空70）的材料，使其满足噪声控制标准。 关键词：环境噪声控制；城市建筑施工；声屏障 Abstrac Construction noise harm to human are in many aspects, on the human impact, mainly for the hearing damage, interfere with sleep and talk to the human body, physiological and psychological impact, will also have a certain impact on the buildings and equipment. In order to influence weakened as a result of construction noise, noise reduction processing method shall be used. Design of the environmental noise control engineering course is mainly aimed at the design of sound barrier for city construction. Through the design of sound barrier length, height, the calculation of diffraction attenuation, absorption noise reduction and so on, and according to the material selection and the sound barrier, choose the best shape and materials to achieve the best effect of noise reduction. In order to make the noise reduction effect is better obviously, with sound absorption materials. The curriculum design for this design a angle greater than 90 degrees of the inverted L type sound barrier, double 1.5 thick plate (hollow 70) materials, so that it can meet the standard of noise control. Keywords: environmental noise control; city construction; sound barrier 目录 第一章 绪论 1 1.1设计目的及意义 1 1.2设计任务和内容 1 1.2.1相关内容 1 1.2.2涉及内容及要求 2 1.2.3工作进度安排 2 1.3噪声基本知识 2 1.3.1噪声定义 2 1.3.2噪声来源 3 1.3.3噪声的危害 3 1.3.4噪声控制技术 4 1.3.5噪声控制的基本途径 5 第二章 声屏障的相关知识 7 2.1声学原理 7 2.1.1绕射 7 2.1.2透射 8 2.1.3反射 8 2.2声屏障插入损失计算 8 2.2.1绕射声衰减△Ld的计算 8 2.2.2透射声修正量△Lt的计算 10 2.2.3反射声修正量△Lr的计算 10 2.2.4障碍物声衰减的确定 10 2.2.5地面吸收声衰减的确定 10 2.3声源特性 11 2.3.1时间特性 11 2.3.2频率特性 11 第三章 声屏障设计与计算 12 3.1声屏障设计要点 12 3.2声屏障目标值的确定 12 3.2.1噪声保护对象的确定 12 3.2.2代表性受声点的确定 12 3.2.3声屏障建造前背景噪声值的确定 12 3.2.4声屏障设计目标值 13 3.3声屏障插入损失计算 14 3.3.1