# Reference manual for building water supply and drainage design (Continued)

Design of basement sewage sump: v = 1.2q/6q – the maximum design flow of riser (when the water injection pump is started for 6 times), a vent pipe directly leading to the outdoor shall be set on the sump

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4) The determination of the maximum discharge of gutter Q (L / s) q = w × V5) Q5 can be calculated according to the rainstorm intensity formula in different areas, and Q5 (L / s × 10-4m2) can also be found according to the building water supply and drainage design manual

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The slope should be towards the pump

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Calculation and selection of septic tank: v-effective volume of septic tank, m3; n-total number of designed people (or number of beds and seats); c-percentage of people using sanitary ware in total number, which is related to the nature of the building

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Reference manual for building water supply and drainage design (Continued) hydraulic calculation table of plastic drainage pipe in building (n = 0.009) table 15 slope H / D = 0.5h / D = 0.6de = 50de = 75de = 110de = 160qvqvqvqv0.0026.480.600.0042.590.629.680.850.0063.170.7511.861.040.0071.210.633.430.8112.801.130.0101.440.754.100.9715.301.350.0120.520.621.580.824.491.0716.771.480.0150.580.691.770.925.021.1918.741.650.020 0.660.802.041.065.791.3821.651.90.0260.760.912.331.216.611.5724.672.170.0300.810.982.501.307.101.6826.512.330.0350.881.062.701.407.671.8228.632.520.0400.941.132.891.508.191.9530.612.690.0451.001.203.062.598.692.0632.472.860.0501.051.273.231.689.162.1734.223.010.0601.151.393.531.8410.042.3837.493.300.0701.241.503.821.9810.842.5740.493.560.0801.331

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The protective height is generally 250 ~ 450mm7

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4

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H-the height of the gutter (M3): V-The velocity of the gutter (M / s); r-the hydraulic radius of the gutter; I-the slope of the gutter (0.003-0.006)

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Take 100% for hospitals, sanatoriums and kindergartens with houses; take 70% for houses, collective dormitories and hotels; take 40% for offices, teaching buildings and industrial enterprise activity rooms; take 40% for public canteens 10% for theaters, gymnasiums and other similar public buildings

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It is used to flush the sediment in the sump

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When there is a sump, it can be selected according to the maximum flow

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The depth and plane of the sump should be determined according to the type of pump

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Q the daily discharge of each person is L / person / d

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3

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A DN25 water supply pipe is generally set on the sump

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Rainwater Design 1

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Design of sump: the sump under the fire elevator should not be smaller than 2m3, the flow rate of fire pump should not be less than 10L / s, the flow rate of suction pipe should be 1.0 ~ 1.2m/s, and the outlet pipe should be 1.2 ~ 1.5m/s

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the daily sludge volume per person is 0.7l/d when domestic sewage and wastewater flow together, and 0.4/d when they flow separately

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A

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The design of oil separation tank is v = q × 60 × t ﹣ a = q / VL = V / AB = A / HV – effective volume of oil separation well m3; Q – design flow rate of oily sewage m3 / ST – residence time of sewage in oil separation well minv – horizontal flow rate of sewage oil separation well M / SA – cross-sectional area of water in oil separation well M2b – oil separation well The width of the well, MH, is the effective water depth of the well, Take the common design parameters of oil separation tank larger than 0.6m, the type of oily sewage, the residence time min, the horizontal flow rate M / s, the edible oil sewage 2 ~ 10, less than or equal to 0.005, the mineral oil sewage 0.5 ~ 1.00.002 ~ 0.010, the maximum distance between the inspection port and the inspection port on the straight section of the horizontal sewage pipe, the pipe diameter, the cleaning equipment type, the production cost water, the domestic sewage with a large amount of suspended solids and sediments, the inspection port 50 ~ 75 Sweeper 1510, 1280, 6100 ~ 150, sweeper 2015, 1510, 128200, sweeper 2520, 015 note: the sweeper should be set on the horizontal drainage pipe, which should be on the floor or floor, and be level with the ground

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Note: 1

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The water level indicator shall be set in the sump, and if necessary, the warning device shall be set to send the signal to the property management center

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External drainage 1

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The protective volume of septic tank is generally provided by the protective height

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when the domestic sewage and wastewater flow together, it is the same as the domestic water consumption, and when they are separated, it is 20 ~ 30 L / person * D

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Note: if there is an open pool in the same room as the sump, the sump shall be forced to exhaust

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Note: the pump shall not be started more than 6 times per hour (automatic start), and the operation time of the pump shall not be more than 5min

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When it is set on the pipe with the diameter more than 100, the cleaning opening with the diameter of 100 shall be used

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604.082.1211.592.5743.293.81 note: the unit in the table is q-l / sv-m / SDE mm

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2

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2) The head can meet the requirement of 2 meters water head

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There should be a 0.05 slope at the bottom of the sump

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The retention time of sludge in septic tank is 12 ~ 24 hours

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The designed lowest water level of sump should meet the requirements of water pump

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The cleaning opening shall be set on the drainage pipe with the diameter less than 100, and the size of the cleaning opening shall be the same as that of the pipe

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6

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5

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Selection of sewage pump: 1) the flow of sewage pump in the building should be selected according to the design second flow of domestic drainage

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B

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6) The design rainfall of each catchment area (L / sq = Q5 × F7) determines the number and diameter of risers according to the maximum discharge of each riser and the building facade.

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Generally, the effective water depth of the sump is 1 ~ 1.5m, and the protection height is 0.3 ~ 0.5m

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General external drainage design procedure 1) determine the roof water distribution line according to the building, calculate the catchment area of each gutter or eaves gutter 2) calculate the drainage area of gutter 3) calculate the water flow velocity of gutter 4) calculate the maximum discharge of gutter 5) determine the return period, And calculate the rainstorm intensity in 5 minutes 6) calculate the rainfall in each catchment area 7) determine the number of risers in each catchment area according to the amount of rainfall 2) design steps 1) catchment area of gutter: the horizontal projection area of roof within the service scope of gutter f (M2) is higher than the catchment area of side wall of roof: ① one side wall is converted into catchment area according to 50% of the area of side wall; ② two adjacent walls, According to 50% of the square root of two side walls, the catchment area is converted; ③ for two side walls with relatively equal height, the catchment area is not counted; ④ for two side walls with relatively unequal height, the catchment area is converted according to 50% of the area above the low wall; ⑤ for three side walls, the catchment area is converted according to 50% of the area of the middle wall below the lowest wall top plus the area of 2 and 4 cases; ⑥ for four side walls, the catchment area below the lowest wall top 2) drainage area m2w = B × h ﹣ W – drainage area of gutter M2b – width of gutter M

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