Design of water supply and drainage and fire fight

2022-08-24
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Design of water supply, drainage and fire protection system of Shin sung building

Shin sung building is a comprehensive building invested and constructed by Shin sung Hwan Electronic Technology (Tianjin) Co., Ltd. of South Korea. The building is 45m high, with one floor underground and ten floors above the ground, with a total construction area of 16500m2. Among them, the basement is for wartime civil air defense, peacetime equipment room and garage; 1、 The second floor is the financial, insurance, securities, business center, etc; 3、 The fourth floor is open office; The fifth floor is the gym, bath and sauna room; The sixth to eighth floors are guest rooms; The ninth floor is KTV private room; The tenth floor is the kitchen and dining room; The top of the tenth floor is the equipment floor

this paper introduces the water supply and drainage design of Xincheng building, and discusses the problems encountered in the design that cannot be used in a large scale

I Design content introduction

Keqiang Li experimental machine is committed to the detailed research of material testing. The design of this project includes domestic water supply, domestic hot water, drainage, reclaimed water, fire water supply, cooling circulating water and other systems

(I) domestic water supply system

the municipal water supply pressure near the building is 0.2MPa. The municipal water supply pipeline is connected to two DN200 inlet pipes, which are measured by the water meter and then connected to the courtyard DN200 annular pipe. Two DN200 water pipes are led from the courtyard ring pipe to the outdoor underground fire pool, and DN100 pipes are led to the stainless steel living water tank in the basement. There are three living pumps in the basement, two for use and one for standby

from the perspective of energy conservation, the domestic water supply system is vertically divided into two zones. The first division is from the underground floor to the second floor, which uses the municipal water pressure to directly supply water; The second zone is from the third floor to the tenth floor, which is pumped and pressurized by the variable flow stabilized pressure domestic pump of the underground domestic pump house from the domestic water tank. The hydrostatic pressure of the lowest water distribution point of sanitary ware in each area is not greater than 0.35Mpa

(II) domestic hot water system

the hot water points of the building are the guest rooms, bathrooms and toilets of the complex building. The maximum daily water consumption of hot water is 24m3/d. A gas-fired boiler is set in the boiler room in the basement to supply hot water, and a hot water storage tank is set in the roof equipment room to store 4.5 m3 hot water. It adopts mechanical full circulation to supply hot water of the same program. A temperature control valve is set on the hot water storage tank. When the water temperature in the storage tank drops to the set value without water, the circulating pump is started to circulate the system to ensure that the hot water supply temperature always meets the set value

(III) drainage system

because this building involves the reclaimed water system, the drainage system adopts the sewage and waste water flow system, and its domestic sewage and waste water are collected and discharged from the building by a set of pipe systems. Clean waste water such as basement ground leakage, refrigerator condensate, pump room drainage, ramp rainwater, fire drainage, etc. are collected by the sump and then lifted and discharged by the submersible sewage pump. The water pump is started and stopped by the liquid level control. The sewage is discharged into the courtyard sewage pipe and then discharged into the municipal pipe after being treated in the septic tank. After the wastewater is discharged to the courtyard wastewater pipe, it is collected and enters the regulating tank as reclaimed water and raw water. The regulating tank is equipped with an overflow pipe. When the raw water volume is greater than the water consumption, the excess part can be directly discharged to the sewage pipe. This can ensure that the amount of reclaimed water always meets the use requirements, and will not cause sewage overflow because the raw amount of reclaimed water is greater than the water consumption

roof rainwater adopts internal drainage system and is discharged to outdoor rainwater pipeline. The outdoor rainwater and sewage diversion system is adopted, and the rainwater is collected by the pipeline and discharged into the municipal rainwater pipe

(IV) reclaimed water system

the reclaimed water point of the building is mainly considered as flushing water. The reclaimed water source is considered to adopt bath drainage, toilet drainage, etc. Because the design cycle is short and there is no measured data, the parameters in table 3.1.4 (below table) of the code for design of reclaimed water in buildings GB are used for design

according to the data in the table, the reclaimed water consumption of this building is calculated to be 35m3/d. The drainage volume of reclaimed water and raw water is about 100 m3/D, and the raw water volume is much larger than the water consumption, so it is unnecessary to consider the make-up of the regulating pool. Rainwater is a good source of raw water, but it has strong seasonality. It is difficult to collect and store rainwater as a reclaimed water source. In addition, the impact load of rainwater needs to be considered in the design to solve the problem of rainwater diversion and overflow. Moreover, the amount of indoor domestic wastewater is sufficient, so rainwater collection is not considered. The volume of the regulating tank is calculated as 110% of the daily water consumption of medium water, taking 40m3. The regulating volume of reclaimed water storage tank is calculated as 30% of the daily water consumption of reclaimed water, taking 11m3

in this design, finished membrane bioreactor is used to treat reclaimed water and raw water. From the perspective of safety, a 50m3/d reactor is selected

the design of the regulating tank is shown in the figure

the regulating tank is located outdoors and underground. Hair gathering wells are set at the inlet pipe of the regulating tank from January 7 to 8, 2017 to preliminarily filter the sundries in the wastewater and further purify the wastewater in the sedimentation tank. The hair gathering well and sedimentation tank need to be cleaned at regular intervals to prevent affecting the treatment water volume. Due to the general layout, the reclaimed water machine room cannot be set nearby, so the machine room is set on the roof equipment floor, and the raw water is lifted by the medium water pump in the basement to the roof reactor for treatment. The control of the intermediate water pump is set in the intermediate water machine room and is uniformly controlled by the controller of the membrane bioreactor. A reclaimed water storage tank is set on the equipment floor. The water tank is equipped with cold water make-up pipe, which will not affect the normal water requirements during equipment maintenance. An ultraviolet sterilizer is set on the outlet pipe of the medium water tank to disinfect the reclaimed water

(V) fire water supply system

1 Fire hydrant water supply system

this building is a comprehensive building of class I building. According to the provisions of table 7.2.2 of the code for fire protection design of high rise civil buildings, the water consumption of indoor and outdoor fire hydrants is 30L/s, However, according to the table, "the height of the building is not higher than the current phenomenon, which seriously affects the common interests of the polyurethane industry. The water consumption of indoor fire hydrants exceeds 30l/s, and the water consumption of indoor and outdoor fire fighting of buildings with automatic sprinkler systems can be reduced by 5 L/s according to this table." Therefore, the water consumption of indoor and outdoor fire hydrants in this design is 25l/s, and the fire lasts for 3 hours

there are three intelligent fire hydrant booster pumps in the underground fire pump room, two for use and one for standby. The fire water tank shared by fire hydrant system and sprinkler system is set on the roof, and the initial fire water consumption for 10min is 18m3. Since the minimum liquid level of the fire water tank and the hydrostatic pressure of the most unfavorable fire hydrant are less than 0.07MPa, two additional fire booster pumps, one for use and one for standby, are set to pressurize the fire hydrant system. The inspection fire hydrant is set in the water tank room on the roof. Because the pressure of the hydrant mouth is not more than 0.80mpa, the indoor hydrant system adopts a partition. When the outlet pressure of the hydrant mouth is greater than 0.50mpa, the pressure reducing and stabilizing hydrant is used. The indoor fire hydrant pipes are arranged in a ring, and the distance between fire hydrants is not more than 30m, and it is ensured that two full water columns reach any point indoors at the same time. Fire hydrants with fire reels are set on each floor. Each fire hydrant is equipped with a pump start button. The fire hydrant system is equipped with two sets of water pump adapters

the water supply pressure of the municipal pipe is 0.2MPa, and the water consumption of the outdoor fire hydrant is provided by the outdoor fire hydrant set on the outdoor annular pipe. The distance between outdoor fire hydrants is not more than 120m, and the distance between outdoor fire hydrants and buildings is not more than 40m

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