Fabric wrapped inside suspended music hall acoustic bass

 The gymnasium of Zhucheng NO.1 Middle School

1.This project is a multifunctional use of comprehensive gymnasium, hall for rectangular plane, positive with rectangular shape stage. One step the audience. Stadium hall building size is: 43.2 m long distance (the audience back to the mouth of the stage), 37.4 m wide, 11.8 m - 16.1 m high. Outside the stadium wall is a regular brick structure, smallpox ceiling for steel structure. The effective volume V material 24660 m3, indoor total surface area S material 6000 square meters.

The picture of the First floor ichnography

The picture of the Second floor ichnography

  3.Architectural acoustics indicators
  Nowadays,all kinds of gymnasium at home and abroad, this is the typical "multipurpose comprehensive stadium" the positioning of the building, including some single sports features strong gymnasium, are also used as a conference, performance in different degrees, which in fact has become a multi-purpose stadium.
  For Stadium's own sound environment requirements,Such as the definition is to ensure that in the game, training of all kinds of personnel between the language communication can be heard clearly.But comprehensive stadium acoustical design put forward higher quality requirements, not based on the function of the sports itself, but in order to satisfy the demand for higher meetings, performances, etc.
   According to the stadium acoustical design and measurement procedures "(JGJ/T131-2000) specification requirements,game hall gymnasium reverberation time in bulk is less than 40000 m2(500-1000 hz) intermediate frequency should be between 1.2 ~ 1.4 seconds.But in fact, the gym reverberation time, especially the low frequency control of reverberation time is difficult.Stadium capacity big, allowed to have a long reverberation time, generally can control under a sellout, intermediate frequency RT = 2.0 seconds can get acceptable results, if can control below 1.7 seconds is better. Stadium to achieve RT is less than 1.4 seconds, the general must make indoor average sound absorption coefficient alpha 0.3 or higher, which requires a lot of design and arrangement of strong absorption structure, make indoor acoustic engineering cost also climbed to a higher position.

The Picture after Remoulding

  Therefore, combined with the actual status of domestic related venues, with reference to relevant acoustic standard and combining with the characteristics of the objective function demand, we determine to intermediate frequency (500-1000 hz) running reverberation time RT = 1.70 + / - 0.1 s, low frequency can be appropriate to ascend, high frequency can have appropriate decline.

      The frequency of the reverberation time relative to the ratio of 500-1000 hz

  Stadium hall side wall flat voice analysis

Stadium hall back wall flat voice analysis

Due to the competition area for hard reflector on the ground, the sound waves can produce strong reflex action, so the ceiling decorate the strong sound absorption performance of materials or structures, to avoid the interference of the echo. Sound-absorbing ceiling configuration structure using spatial sound absorption, sound absorption effect is significant, not only has good decoration effect and saving investment, convenient construction.

                  Acoustic ceiling space body installation drawing

Audience hall for a rectangular structure, for a pair of parallel walls on both sides of the wall, one side side walls due to the lighting requirements, is almost entirely made up of glass surface, it is very bad for acoustic, but not on the acoustic processing, so only the beam-column parts adopt polyester fiber acoustic board (elevation 3.5 meters) and groove wood perforated plate (elevation 3.5 meters) real post processing, reduce the reflections of in high frequency. Therefore, must be parallel to the other side wall to make strong acoustic processing, to reduce the probability of multiple echo, avoid adverse sound reflection; On the other hand, it can reduce the reverberation time of hall, enhance the language articulation. Side wall under the elevation 3.5 meters, 13/3 specification groove wood sound-absorbing board, after the installation of 50 cavity fill 50 thick glass cotton with high density, to reduce the vibration of hall echo, standing wave acoustic defects, etc. Side wall laid polyester fiber board (splint substrate), cavity after 50, with cavity plate structure control in the low frequency reverberation time, facing the polyester.

In order to prevent after the issue of the sound from the speaker by the back wall reflection will spread stage space, so that the stage personnel clearly hear the echo, need to make sound absorption process on the back wall. Seating area 3.5 meters height above the following laid groove wood acoustic panel, 3.5 meters height above laid polyester acoustic panel.