】 【Weak current College on water supply and drainage construction design FAQ.

<br> <br> Summary: in drainage design and construction, the strict implementation of the existing relevant norms, summing up the design and construction of installation of lessons, improve and enhance the overall installation process standards, and strive to provide the community with .functional and reliable, beautiful and practical architectural masterpiece. Article by building design and construction of water supply and drainage works, elaborates on the practice of design and construction of common problems and their solutions. <br> <br> Keywords: life in the water .supply system; drainage; architectural design <br> <br> First, domestic water supply system <br> <br> Domestic water supply system frequently asked questions are as follows: <br> <br> 1. from the urban water ring out .different pipe into the tube to the next residential community water supply, and the community water supply pipe and the formation of urban water supply pipe, the pipe into pipe pipeline leak located on backflow device. Because this situation is equivalent to community water supply main pipe .into the urban water ring of a connecting pipe, due to the city ring different pipe pressure cannot be the same, if you set the clock to prevent leakage, urban ring in the Shui will consist of high pressure to low pressure of the interfaces of the .interface flow, causing a meter to reverse and community networks in the pollution of water within the urban network. <br> <br> 2. squatting stools flushing tube still exist using ordinary valves and direct connections for drinking water pipes. This may be due .to construction or construction units in order to reduce the construction cost, or consider households will be the second decoration design for the sake of change. But the consequences of doing so is obvious, once the water standpipe reversal occurred for some reason, but at this .point the stool as jam full of sewage, will take place the siphon life water pipelines for flowed. Thus non-drinking water pipes using ordinary valve connection and control direct washing stool should be used with time-lapse self-closing and siphon automatically destroy the .functions of the stool time-lapse self-closing flush valve. <br> <br> 3. drinking water tank into the hole, snorkel, overflow pipe is not taken to prevent insects crawling into existence, measures to lower the siphon backwards, when .fles to drown out the flow tube top vacuum destruction device is not set; the inner wall of reinforced concrete pool and pool piping, metal accessories are not used on the receiving non-polluting materials. All of these are likely to result in drinking water or .municipal water contamination, to avoid contamination of drinking water in the sink hole cover and cover seat should match and close, and elastic non-toxic foam inlay in the seams; snorkel outlet and overflow pipe trumpet Department should have the copper wire netting or other corrosion .-resistant materials made of netting, the mesh is 14 ~ 18 mesh; overflow pipe exports from pool outside the ground level 200 ~ 300mm, light should be installed on the exit door or net cover; submerged discharge pipes can pool above the water level in .the overflow pipe inside the holes into the open, either submerged discharge may also reduce bath antisiphon backwards; pool finished water pressure test, the tank wall and pool piping, metal accessories should brush enamel paint, pool ladder in stainless. <br> <br .> Second, the drainage system <br> <br> Drainage system frequently asked questions are as follows: <br> <br> 1. floor drain water height less than 50mm so easily floor drain dry, loss of other smelly function, odor pollution .indoor environment. Installation must be a qualified product, or you can take through the floor drain plus water bends. Floor drain installation height is reasonable, floor drain installation is too high, the surface will result in stagnant water, drainage function; installation is too .low, affect the surface appearance. During the installation of pipes for water, you should ascertain the floor drainer specifications and floor decoration layer thickness, to calculate the drain socket of a reasonable level. Current leakage model many selection, floor drain, it should be .based on a different location to select different type of leak. Public kitchen should adopt network box-type floor drain, toilet should be confined to leak, washing machine parts should be used to prevent overflow and dry special floor drain. <br> <br .> 2. in the open manhole construction process, some construction personnel will check well made heavy mud well, failing to comply with the prescribed do diversion channel, resulting in a large number of bottom deposits of faeces. This is not only easy to influence environmental .health, will also affect septic tank treatment effects. <br> <br> 3. high-rise building set of UPVC pipes has not taken measures to prevent the spread of fire. The specification clearly states: high-rise building interior plastic drain pipe .downlead set and whose diameter is greater than or equal to 110mm the standpipe wearing floor office setting fire casing or collar, aims to prevent the underlying the spread of fire through the pipeline runs through the first layer. <br> <br> 4. terrace .roof rainwater drainage and, not separate settings for the connection. This results in a once rainwater riser a certain plug, roof rainwater through the balcony floor drain overflow; second General rainwater riser access rain check well, rain checks the well of the smell will pass .the balcony floor drain into the rooms, the indoor environmental pollution. Thus requires balcony rainwater drainage system should set up a separate, and balcony rainwater riser should indirectly drainage at the bottom. But if in life balcony considered washing machine placement, balcony drain now is .wastewater, stack drainage should access the drainage system, you cannot directly to outdoor or rain water system. <br> <br> 5. kitchen and toilet drainage pipe is not set, the layout of the near and the interior wall of the bedroom adjacent .drainage pipe is not a noise measure pipe. The residential building code "GB50386-2005 section 8.2.7 and provisions on this. In order to prevent the toilet drainage duct of dirty harmful gas conspiracy to kitchen, occupant health impact, when the kitchen and .bathroom adjacent arrangement, should not be shared with a drainage pipe, which should be in the kitchen and bathroom set up. To avoid sewer noise impact living, bedroom near placement and adjacent interior of the drainage pipe can not be used for ordinary plastic drain pipe .should be used in rubber sealing ring flexible joint mechanism of cast iron pipes, double-layer of foamed plastic drain pipe, plastic drain pipe inner spiral muffle noise reduction measures, such as a pipe. There are experimental data indicate that the flow tube when the .DN100 2.7l / s cast iron pipe noise value is 46.5dB, PVC-U pipe noise value is 58dB. <br> <br> Third, the fire water system <b> </ b> R> <br> Fire water supply .system of the common questions are as follows: <br> <br> 1. fire-fighting water supply network pressure test fails construction plan and specification requirements. Pipe pressure test score leak repair and strength tests carried out in two steps. Leak in atmospheric .or slightly up pressure state and pressure strength test points and test pressure in two phases. At present, some sites are only for pipeline leak test or the test pressure is not in conformity with the design and specification requirements so that the normal operation of the system .brought trouble. In accordance with the specifications, network installation has been completed, should be strength and tightness test. For potable water and fire water pipe, test pressure for the pipe work pressure of 1.5 times, and not less than 0.6MPa. Strength test .is under the pressure of the pipeline network in experimental 10min, pressure drop is not greater than 0.05MPa is qualified. Then the test pressure slowly fall to work under pressure, check no leakage, the tightness test is qualified. For automatic sprinkler system. When .the design working pressure ¡ü1 .0 MPa, water pressure strength test pressure is the pressure of the design work, and not 1.5 times lower than 1.4MPa; when the design pressure> 1.0MPa, water pressure strength test pressure shall be the working pressure 0.4 .MPa. Water pressure strength test is under the pressure of the pipeline network in the experiment, pressure stability 30min not greater than 0.05MPa is qualified. While the pressure tightness test should water pressure strength test and pipeline flush after passing the test pressure shall be designed .to work under pressure regulator 24h, no leakage is qualified. <br> <br> 2. a sprinkler system installed in the ceiling area of the upright sprinkler and beam distance does not meet the specification. Especially in the original design by a ceiling layout .nozzle, and the actual installation of the ceiling is not set, building and construction does not require design modifications only simply hanging-type nozzle instead of the vertical-type nozzles, the nozzles and beam distance in particular does not meet the requirements, there are .complex roof beam layout, irregular, designers in the layout when you failed to consider fully the nozzle, construction unit according to the layout of the design the nozzle actually meeting the specification requirements. At this point, construction personnel should promptly notify the designers make modifications .to the original design, on local problems, also under the automatic sprinkler system installation and acceptance of GB50261-2005 section 5.2.8 themselves to reducing the beam on the sprinkler effect. When this specification is difficult, the splash plate and roof should not be .greater than the distance and nozzle 550mm splash plate can not be lower than the bottom beam. <br> <br> 3. hydraulic alarm sprinkler system is not set on the public channel or walls of the signal. When you use the site in case .of fire, fire sprinkler system is powered up, the alarm sounds cannot be on duty personnel or other persons in the protection of sites found that relying on fighters in a timely manner, resulting in unnecessary loss of property and casualty, and after the fire fight .water control valve not conveniently close and maintenance checks. <br> <br> 4. fire hydrant system pressure reducing valves model options. General Designer in fire hydrant for fire protection design 1.00MPa hydrostatic pressure of not more than, to avoid system piping layout .of complex, are not taken to partition the water supply system, but through the selection of vacuum type fire hydrant to meet specifications for fire protection design on fire hydrant outlet pressure of not more than 0.50MPa requirements. In this way adopts the position of vacuum .-type fire hydrant to many, select decompression should be according to the type required by the fire hydrant water inlet pressure range select the corresponding type of fire hydrant. <br> <br> IV. concluding remarks <br> <br> In short ., we either in design or construction process, should be strictly enforce existing related specification, summing up the design and construction of installation of lessons, improve and enhance the overall installation process standards, and strive to provide the community with functional and reliable, beautiful and .practical architectural masterpiece. <br>.