I. Water supply:

1. In the design water consumption of residential area, the fire water consumption is only used for checking and calculating the pipe network, and is not included in the normal water consumption.

2. The minimum working pressure of the delay self-closing flushing valve is 0. 10~0. 15MPa.

3. The air gap at the lowest point of the water inlet of the drinking water pool (tank) above the overflow edge should be equal to the diameter of the water inlet pipe, but the minimum is not less than 25mm and the maximum is not more than 150mm. When the outlet of the water inlet pipe is flooded, measures to prevent siphon backflow such as vacuum breaker should be taken.

Attachment: The pool located in the basement, especially the pool located on the second floor or below, can be considered not to generate siphon backflow when the highest water level in the pool is more than 300mm lower than the bottom of the building water supply inlet pipe, and the above restrictions are not required.

4. When the domestic drinking water pipe network supplies water to other water storage tanks (boxes) such as fire fighting, reclaimed water and rainwater reuse, the air gap between the lowest point of the water inlet and the overflow edge should not be less than150 mm..

5. There shall be no pollution sources such as septic tanks, sewage treatment structures, seepage wells and garbage dumps around the buried drinking water storage tank/within 0/0m; There shall be no sewage pipes and pollutants within 2m around. Otherwise, pollution prevention measures should be taken.

6, drinking water pool (box) in the building, should adopt independent structural form, shall not use the ontology structure of the building.

7. The domestic water supply system of high-rise buildings should be vertically partitioned, and the vertical partition pressure should meet the following requirements: 1) The hydrostatic pressure of the lowest sanitary ware distribution point in each partition should not be greater than 0.45MPa.

2) For the household pipes (or horizontal water distribution pipes) with hydrostatic pressure greater than 0.35MPa, decompression or pressure regulating facilities shall be set, and the water supply pressure of household water points in the residential suite shall not be less than 0.05MPa.

3) The water pressure of the most unfavorable water distribution point in each partition shall meet the water pressure requirements.

8. The water supply pressure of the household pipes in residential buildings (the section from the domestic water supply pipe to the water meter) should not be greater than 0.35MPa.

9. Valves and filters should be set before the pressure reducing valve. After the pressure reducing valve needs to be dismantled and overhauled, a pipeline expansion device should be set. When there is water backflow behind the valve during maintenance, the valve should be set behind the valve. Pressure gauges shall be installed at the front and rear of the pressure reducing valve nodes.

10. Pipeline filters should be installed in the water supply pipeline: valves such as pressure reducing valve, pressure relief valve, automatic water level control valve and temperature regulating valve should be installed before; Water heater inlet pipe and heat exchanger circulating cooling water inlet pipe should be set; Pump suction pipe shall be provided.

Attachment: The pipeline filter does not need to be set repeatedly in series.

1 1. Coverage depth of outdoor water supply pipeline: the minimum coverage depth of the pipe top is not less than 0. 15m below the soil freezing line, and the coverage depth of the pipeline under the roadway is not less than 0.70m

12, the indoor water supply pipeline should not pass through the distribution room, elevator room, communication room, large and medium-sized computer room, computer network center, audio-visual warehouse and other rooms that damage equipment or cause accidents in case of water, and should avoid production equipment and power distribution cabinets.

13, the water supply pipeline shall not pass through the defecation trough and urinal, and the riser shall be not less than 0.5m from the end of the defecation trough and urinal.

14. When the water supply pipeline crosses the following parts or takes over, waterproof casing shall be set:

1) passes through the basement or external wall of underground structure;

2) Crossing the roof (not required when reliable waterproof measures are available);

3) When crossing the wallboard or floor of the reinforced concrete pool (box), connect the pipes.

15, head loss of water meter:

1) The water meter on the water inlet pipe of a building or residential area should be 0.03MPa when domestic water is used; When checking the fire fighting conditions, the appropriate value is 0.05MPa.

2) The water meter on the residential entrance pipeline shall be 0.0 1MPa.

16, the design of residential water storage tank:

1) When the data is insufficient, the adjustment amount of domestic water can be determined according to 15%~20% of the maximum daily water consumption of the community.

2) The storage tank shall be divided into two compartments with basically equal volume.

17. When the data is insufficient, the volume of the low-level domestic storage tank (tank) in the building can be determined according to 20%~25% of the maximum daily water consumption of the building. The gap between the roof of the manhole pool and the bottom of the upper building body plate should not be less than 0.8m

18, set up a water pump room, and set up drainage facilities; Ventilation is good, and it can't freeze.

19, the height of the pump foundation above the ground should be convenient for the installation of the pump, and should not be less than 0.1m; ; When the pipe diameter is less than or equal to 150mm, the distance between the outer bottom of the pipe in the pump room and the ground or the bottom of the pipe trench should not be less than 0.20 m; When the pipe diameter is greater than or equal to 200mm, it should not be less than 0.25m m.

Residential buildings with 20.8 floors and above should be equipped with indoor fire water supply facilities, and residential buildings with 35 floors and above should be equipped with automatic sprinkler system.

Second, the drainage part

1. The drainage pipe shall not pass above the drinking pool.

2. Horizontal drainage pipes shall not be arranged above the main and non-staple food operations, cooking and meal preparation in the canteen and catering kitchen. When restrictions are unavoidable, protective measures should be taken.

3. Rubber rings shall not be used to seal the pipe joints buried in the filling layer, and bonding and welding are recommended.

4. The drain pipe of a single drainage riser should have the same diameter as the drainage riser; When the drainage riser adopts an inner spiral pipe, the bottom of the drainage riser should adopt a long elbow reducing joint, and the diameter of the drainage pipe should be doubled.

5. The minimum air gap in indirect waste pipe is 150 mm when the pipe diameter dn > 50. ..

6, outdoor drainage pipe joint, should set up inspection well connection, and joint water deflection angle shall not be > 90, when the drainage pipe diameter is less than or equal to ≤300mm, and the gap is greater than 0.3m, can not be limited by the angle.

7. The drainage quota of residential area should be 85%~95% of the water quota of water supply system. The high value is taken for residential areas in big cities, when plastic drainage pipes and plastic inspection wells are used for buried pipes in residential areas, the high value is taken when the groundwater level in residential areas is high.

8. When the diameter of outdoor domestic drainage pipes (including rainwater) is 200 mm or more, the spacing of inspection wells should not be greater than 40 meters. ..

9. The distance between the cleaning port at the starting point of the horizontal drainage pipe and the wall perpendicular to its end should not be less than 0.20m.. When a plug is set at the starting point of the drainage pipe to replace the cleaning port, the distance between the plug and the wall should not be less than 0.40m. ..

10, the following drainage pipes shall be provided with annular vent pipes:

The horizontal drainage branch pipe connecting four or more sanitary wares has a length exceeding 12m.

A horizontal branch pipe connecting six or more toilets.

1 1, equipped with appliance vent pipe.

12. When the length of ventilation riser is more than 50m, its diameter should be the same as that of drainage riser.

13. The diameter of ceiling ventilation pipe should be the same as that of drainage riser. However, in areas where the average temperature in Leng Yue is below-13℃, the first-class diameter should be increased at the indoor ceiling or 0.3m below the ceiling. When two or more vent pipes of sewage riser are connected together, the cross-sectional area of the combined vent pipe should be 0.25 times the sum of the cross-sectional area of the largest vent pipe and the cross-sectional areas of other vent pipes.

14, each domestic sewage collection tank is set as a unit in the public building with a standby pump.

Note: When two or more drainage pumps are used for drainage in basement, equipment room and garage, it is not necessary to use the equipment pump.

15, the septic tank is not less than 30m away from the underground water intake structure. The outer wall of septic tank should not be less than 5m away from the outer wall of the building, which will not affect the foundation of the building.

16. Rainwater on the podium roof of high-rise building should be discharged separately.

17, the effective volume of open ditch drainage sump at the entrance and exit of underground garage should not be less than the maximum water output of drainage pump for 5 minutes.

Third, the hot water part.

1, and the rated hot water temperature is 60℃.

2. It is forbidden to install the valve on the expansion pipe.

3, hot water pipeline system, there should be measures to compensate the expansion of the pipeline.

4. The highest point of the main water distribution pipe of the upward delivery system should be equipped with an exhaust device, and the downward delivery system can use the highest water distribution point for air release, and the lowest point of the system should be equipped with a drainage device.

5. The diameter of the steam trap should be determined by calculation. A filter should be installed in front, and no bypass pipe should be attached to the side.

Four, the characteristics of building water supply and drainage design in cold and severe cold areas are mainly anti-freezing.

1: Indoor domestic water supply system and fire fighting system: the temperature of the pipe well near the external wall of the building is low, so it is necessary to consider the pipe well and heating pipe well. Heating is needed between the basement computer room and the roof water tank. The fire hydrant for roof test can be located at the exit of stairwell or in the water tank room for heating the roof. If the water supply or fire fighting pipeline must be installed outdoors or indoors without heating, an electric heating system is needed for insulation. Fire hydrants and spray risers are best arranged in the pipeline shaft shared with the heating pipeline, and should not be arranged in the unheated parts such as stairwells. If there is no heating in the basement, the automatic sprinkler system should adopt dry system, or replace the pre-action system of dry system (no aeration).

2. The fire hydrant system should be electrically heated and insulated, and the electrical specialty should provide enough power; If the HVAC major adopts duty heating, the automatic sprinkler system can also adopt wet system, and the part directly connected to the outdoor (underground garage entrance, etc.). ) and water supply and drainage pipeline and fire pipeline may freeze, local automatic sprinkler system can consider using electric heating system or dry system. When setting fire control system in non-heating buildings (workshops, warehouses, etc.). ), you can usually use dry fire hydrant system and dry or pre-acting automatic sprinkler system.

3. Indoor sewage system and rainwater system: Both sewage and rainwater pipes are arranged as internal drainage systems. The rainwater pipes on the roof of residential buildings should be closely coordinated with the building specialty, so that rainwater risers and suspension pipes can be arranged in public places. Because balconies are mostly closed balconies, there is no need to set rainwater risers and floor drains on landscape balconies to drain balcony rainwater. Life balcony, where the washing machine is placed, needs to set drainage standpipe and special floor drain for washing machine. If the balcony may freeze, corresponding insulation measures should be taken.

4. Outdoor water supply system and fire fighting system: The conventional laying methods of outdoor buried water supply and fire fighting pipelines generally include direct laying and overhead laying, of which direct laying is the most commonly used. When laying overhead, pipe rack and heat preservation measures should be considered. In the cold areas in the north, steam tracing pipes and heat preservation materials are often used for heat preservation, that is, steam pipes with the same length are laid to ensure that water supply and fire fighting pipes are not damaged by freezing.

5. When the calculated outdoor heating temperature is lower than-10℃, wellhead insulation or other insulation measures should be adopted for all kinds of outdoor water meter wells, valve wells, fire hydrant wells, water pump adapter wells and various pools. In general, an insulated wellhead and a wooden insulation cover should be set at the manhole. The fire hydrant manhole cover is above the surrounding ground 100mm to prevent rain, snow and water from flowing in. In order not to affect the traffic, fire hydrants can be set on the green belt and marked. Outdoor buried pools should also have anti-freezing measures. The pool should be covered with soil for thermal insulation, and the depth of the pool top should be below freezing point as far as possible to ensure that the high water level of the pool is below freezing point. Manholes and water intakes of the pool shall be provided with thermal insulation wellhead and wooden thermal insulation cover.

6. Outdoor sewage system and rainwater system: There are generally two reasons for pipeline freezing. One is that the buried depth is too shallow and the thermal insulation measures are not enough; The other is that the slope of the pipeline is too small, the drainage speed is slow, and the heat of sewage is lost quickly, and it has already frozen before entering the inspection well. The fundamental way to solve the freezing phenomenon is to increase the buried depth of the pipeline below the freezing line, which can ensure that the pipeline will not freeze all the year round.

7. The buried depth of water supply and drainage pipelines should be 375px below the local freezing point, and the water supply should be 250px below the drainage. Generally, the buried depths of water supply pipes, drainage pipes, water supply pipes and drainage pipes should be-1.300,-1.200,-1.400 and-1.300 respectively.

I believe that after the above introduction, everyone has a certain understanding of the summary of error-prone problems in the Code for Design of Water Supply and Drainage in Buildings. Welcome to Zhong Da for more information.

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