Study Of Drainage Characteristics And Optimization Of Special Singe Stack System In Super High-rise Buildings

In recent years,with the rapid development of the society and economy,high-rise buildings have spread all over the major cities of our country,accompanied by the increasing nervous pressure on building drainage system.Anti-odor is one of the major problems affecting the indoor living environment.It can not only seriously pollute the indoor living environment,but also damage the residents'physical health.Nowadays,with the rapid development of real estate,how to improve the drainage capacity of the drainage system is an urgent issue to be solved.The special single stack system has the advantages of saving materials,convenient installation,and saving space compared to other drainage systems,turning out to be a greatly potential application for the building drainage in the future.However,there is relatively little research on special single stack drainage systems in China,and few actual domestic researches on their drainage capacity,especially on high-rise or super-tall buildings.In response to the above problems,this study was relied on the project“Technical Regulations for Sanitary Safety of Drainage Systems in High-Rise Drainage Buildings”.The experiment was carried out in a full-scale test tower with a height of 122.9m.The main research of my work contained three ways:?1?to explore the feasibility of fresh water as the test drainage medium;?2?to study the drainage characteristics of special single stack system and its influence factors on drainage capacity;?3?Based on the former two points,to discuss the the optimization of the system.After implementating lots of tests,the main results were as follows:?1?Using the instantaneous flow method,glue cotton was served as the solid waste in a super high-rise?100.5m?special single stack system.The extreme pressure,extreme pressure of each floor and transient pressure variation before and after the addition of glue cotton were studied and compared.The results indicated that the addition of glue cotton could affect the pressure fluctuations of the drainage system,but the effect was relatively weak,and it wouldn't significantly increase with the increasing confluent flow.Therefore,it coule be concluded that the usage of fresh water could be the test medium in a building drainage test.?2?The drainage capacity of special single stack system coule reach 8.5L/s.The extreme pressure of each floor increased with the lower of the floor,demonstrating as a Chinese font“?”.The P_smax and P_smin were distributed at the bottom of the stack.In addition,the transient pressure was alternately displayed in positive or negative state.?3?Based on?2?,the influencing factors of the drainage system was respectively studied.The influencing factors,the the capacity of the system in this case and their propotion compared with original system were as follow:?1?Upper connection pipe fittings:changed the II cyclone to I cyclone?4.5L/s,52.9%?.?2?Lower connection pipe fittings:changed the large curvature elbow to 90°elbow?2.3L/s,29.4%?.?3?Standpipe diameter:changed the Drain pipe diameter DN110 to DN125?9.0L/s,105.8%?.?4?Drainage height:changed the drainage height 33F to 26F?9.0L/s,105.8%?or 15F?9.5L/s,117.6%?.Moreover,it was necessary to strengthen that the II cyclones and large curvature elbow should be simultaneously used in order to ensure the drainage capacity of the system.And little impact on the capacity of system would emerge when altering the pipe diameter of drainage height.?4?By comparing the ventilation flow of different settings in?3?,it could be learned that the increase of pipe diameter could significantly increase the ventilation flow,but the change of drainage height was of little impact on ventilation flow.However,the increase of ventilation flow was not apparently helpful to the drainage capacity.?5?Based on?2?,the AAVs was installed on the horizontal branch of system.The test showed that both of the positive and negative pressures was effectively relieved.The drainage capacity under different conditions of AAVs setting and their proportion to the original system were:Continuous settings?per layer??9.5L/s,117.6%?>Compartment settings?9.0L/s,105.8%?.?6?The drainage capacity of the special double stack system was 5.5L/s,and the extreme pressure of each floor was shown as a Chinese font“?”with the change of floors.Furthurmore,with the same drainage flow,the ventilation flow of special double stack system was half of that of special single stack system.