Chapter five: what is the impact of elevator noise in super high-rise residential buildings? How to solve it?

——Welcome to visit the column "elevator noise prevention and control I am an expert - ask if you don't understand". This article is the fifth chapter after the column is opened. The topics answered in this chapter come from the technical questions raised by many domestic real estate companies in construction projects

Q:

1 customer technical questions

What is the impact of elevator noise on super high-rise residential buildings?

background

No one can resist the dream of Chinese dreamers expanding to the sky! Many residential projects under construction in Beijing, Shanghai, Guangzhou and Shenzhen have advanced to a height of 50-60 floors, and some residential buildings in Wuhan, Changsha, Hangzhou, Dongguan, Foshan and other places have also begun to move towards 40-50 floors in succession - elevator, as an indispensable vertical transportation tool in super high-rise buildings, has been widely used. However, when our thinking is still to use the speed of 2 meters / second as a high-speed elevator, the super high-speed elevator with the speed of 4 - 6 meters / second has blossomed everywhere and is installed in most of the super high-rise residential buildings. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

Behind the high-rise buildings, the elevator noise is increasingly serious. The social problems such as the complaints about elevator noise, the rights protection of elevator noise owners, the application of elevator noise standards, the supervision and law enforcement of elevator noise began to emerge. In the current residential building design, I believe that every large brand developer has more or less experienced the "entanglement of elevator noise"; I believe that every urban construction management department has more or less experienced the "questioning of elevator noise"; I believe that every urban elevator special department has more or less experienced the "appeal of elevator noise"; I believe that every urban ring Insurance regulatory departments have more or less experienced "elevator noise complaints".

However, who can really tell the story behind this? Who has enough experience to share?

 "When encountering elevator noise, our proposition is" ask if you don't understand, welcome to ask! " "Mr. elevator", a domestic elevator noise control expert, will answer the elevator noise problems you encounter personally. "

Excerpt of some real estate companies' phone calls is as follows:

1. In the super high-rise building project (50 floors) under construction of Shenzhen shenx group, the elevator of 4m / S is adopted. Part of the house type study and elevator share the same wall design. Call to inquire: how much influence does the elevator noise have on the adjacent rooms? Is there a better way to solve the problem of elevator noise?

2. In the (48 storey) super high-rise building project under construction by Dongguan x science and technology real estate Co., Ltd., the elevator is 3.5m/s. The elevator and one of the bedrooms share the same wall design. Call for consultation: the architectural design has been unable to be changed. Is there any plan to ensure that the adjacent rooms are not affected by elevator noise?

3. In a Xi'an super high-rise apartment project (53 floors, using 4 m / s Elevator) in the charge of Shanghai tongx Design Institute, the room is adjacent to the elevator. The original drawing has designed a 600 wall thick concrete sound insulation wall. Call to inquire: can the thickened sound insulation wall solve the elevator noise? If elevator noise still exists, how to deal with it?

4. In a 40 storey super high-rise project built by Wuhan Hutchison Real Estate Co., Ltd. (using a 4m / s Elevator), the elevator is designed adjacent to the living room. The customer complains that the elevator noise is too loud, and calls for consultation: can this elevator noise be solved? Is there a successful elevator noise reduction case in Wuhan?

Technical answers

The influence of elevator noise is very serious

There are two directions to solve elevator noise thoroughly

Mr. elevator's reply:

1、 In the super high-rise residential buildings, how much is the influence of the interior noise of the adjacent design with elevators?

In order to let you have a more in-depth sense of the impact of elevator noise in super high-rise residential buildings, the recent elevator noise monitoring situation of Shenzhen and Japan company in a super high-rise mansion in Shenzhen area is presented to you:

深圳地区某超高层住宅 

Elevator and house type design drawing of the super high-rise building

In the above figure, you can not only intuitively feel the impact of elevator operation on indoor noise environment, but also understand that the impact of elevator noise on adjacent rooms is very serious. Although we are analyzing a case of Shenzhen, it is not a case at all. In fact, no matter what brand of elevator, no matter what kind of building wall structure application, the site will be affected by obvious elevator noise. Although the severity will be different, but from the analysis and summary of more than ten years' experience in elevator noise prevention and control in Shenzhen and Japan, the core of the indoor interference by elevator noise is whether there is a common wall between the elevator and the household, not the building The wall structure of the body or the selected elevator brand. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

Therefore, under the premise of the application of elevator and building technology at the present stage, as long as there is a common wall design in the super high-rise residential buildings, there is a 100% impact of elevator noise in the rooms close to the common wall of the elevator. Elevator noise is mainly divided into three parts:

1. The low-frequency vibration and noise of the elevator machine room and the running vibration of the equipment in the elevator machine room are transmitted rigidly through the wall building structure, which affects the residents close to the top 3-5 floors (especially the elevator holding brake sound when the elevator starts and stops);

2. Low frequency vibration and noise of elevator guide rail, friction vibration of guide rail and guide wheel, friction vibration of guide wheel and steel wire rope, etc. are transmitted to the building wall through guide rail. When the elevator runs through the area, the elevator noise will generate "boom" noise like the aircraft or subway passing by, affecting the similar rooms;

3. The sound insulation quality of the elevator shaft wall is insufficient. Due to the high running wind speed and strong noise source of the super high speed elevator itself, the wall at the side of the shaft and the household shared wall needs to have enough sound insulation requirements. If the brick wall with light structure or the construction hole in the shaft is poor, the air caused by the elevator noise may also be caused by the poor sound insulation of the elevator shaft wall Transmission effect.

To sum up: in the super high-rise residential buildings, although for the cases of different building structures and different brands of elevators, the degree of impact will be different, as long as there is a common wall design between the elevator and the residents, all the floor residents adjacent to the elevator will be affected by the obvious noise interference of the electric elevator. According to the cases collected at present, in general, the noise of the indoor elevator can be as high as 45-55 decibels during the operation of the elevator, and the noise value will exceed the requirements of the current national building and environmental protection regulations and standards. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

2、 How to solve the elevator noise in the super high-rise residential buildings adjacent to elevators?

From the experience of more than ten years of elevator noise prevention and control cases collected by the Shenzhen and Japan team, it can be seen that any measures such as elevator sound insulation wall, 600 thick double concrete wall, elevator shaft silencing device, and elevator shaft sound absorption sand can not fundamentally solve the elevator noise problem. Especially in super high-rise buildings, elevator noise is the most serious. Because the main transmission mode of elevator noise is vibration transmission, as long as the energy of elevator vibration source is not absorbed or the vibration transmission path is not cut off, the impact of elevator vibration and noise will always exist. This is also the root cause that many real estate companies adopt so-called elevator noise reduction measures, but they have no effect. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

To truly solve the impact of elevator noise, there are only two feasible directions at this stage:

A. In order to realize the design of separating the elevator from the household, the fire stairs or walkways can be designed between the household room and the elevator (but in addition to the increase of the construction cost, such design often needs to sacrifice a large public building area, so as to affect the overall occupancy rate);

 B. Select effective and reliable measures for vibration reduction and noise reduction of professional elevator machine room and elevator guide rail to absorb and isolate the vibration transmission of elevator from the way of vibration transmission of elevator (although this scheme also needs to invest a certain construction cost, it can make the architectural design more convenient and free, with higher occupancy rate). The following are the vibration and noise reduction system of Shenzhen Japan super high speed elevator machine room and the vibration and noise reduction system of Shenzhen Japan super high speed elevator guide rail developed by Shenzhen Japan company.

The vibration control system of super high speed elevator room in Shenzhen and Japan 

Vibration control system of guide rail of super high speed elevator in Shenzhen and Japan

 Since 2004, it has been widely used in most cities in China. At present, it has been applied in most of China's top 100 real estate enterprises, such as poly, rongchuang, hongrongyuan, Lvcheng, overseas Chinese town, Xinghewan, Zhonghai, China Resources, Evergrande, Youngor, Beijing first development, Beijing urban construction, Vanke, Xiangsheng, Yincheng, etc. From the case of elevator noise reduction in the early stage of Shenzhen and Japan, through the application of Shenzhen and Japan noise reduction technology, all elevator noise complaints can be completely solved.

See the following figure for data comparison before and after noise reduction:

(a 58 storey super high-rise project in Wuhan area, data comparison before and after adopting Shenzhen Japan noise reduction technology)

治理前

After governance

 The annoying "buzz" low-frequency noise no longer exists after the measures of Shenzhen and Japan elevator noise reduction are adopted. Most importantly, in the return visit to the complainants in the building, they all expressed their satisfaction and recognition for the effect of noise reduction. Therefore, choosing the professional elevator noise reduction technology of Shenzhen and Japan to solve the elevator noise problem is another correct solution direction besides the architectural separation design. For detailed questions about elevator noise reduction technology, you can call Shenzhen and Japan noise reduction hotline (0755-86379063) or add elevator first wechat (Dianti SIR) for technical consultation. (welcome to the original column "elevator noise prevention and control I am an expert - ask if you don't understand")

Column introduction

I am an expert in elevator noise prevention

Mr. elevator, the enlightener of China's elevator noise reduction industry, has been promoting the application of elevator noise prevention and control technology nationwide since 2005. He has provided free consultation and technical answers to the users who are bothered by elevator noise through blogs, QQ, forums, etc. For more than ten years, we have been sticking to our original dream: "to eliminate elevator noise and save people's quiet life!" So far, Mr. elevator and his team have served more than 100000 users.

In order to let more customers get timely answers when encountering difficulties in elevator noise control, Mr. elevator has since March 2019 set up a column in WeChat public, "elevator noise prevention, I am an expert - I don't understand you." Customers are welcome to raise your questions through the WeChat public number "elevator noise control", elevator signal or dianti-sir (0755-86379063).

In addition, we will regularly select some representative "elevator noise questions" to give public answers, so that more customers suffering from elevator noise can find the right answers!

"Mr. elevator" claims: "when encountering elevator noise, ask if you don't understand. Welcome to ask!"