传统重力式雨水斗与虹吸式雨水斗性能比较传统重力式雨水系统（见图1）是由雨水斗和垂直落水管网组
成的。雨水斗收集的雨水通过垂直落水管排至地下排水管网中。
为保证雨水顺利流至排水管网，这种传统重力式雨水系统结构所
需的排水管管径往往比较大，且与其相连的地下管网的管径也比
较大。这主要是由于系统内处于恒定的大气压力（见图2），雨
水只靠垂直管道水落差产生的动力和水平管道的坡度流动。顺着
垂直落水管像瀑布一样下流的雨水在水平管道内产生翻腾（见图
2），这样即便是在最大降雨量的情况下，水平管内也有超过横
截面积1/2的空间充满了空气。也就是说，若能排除空气，相同的
水量只需传统重力式雨水系统1/2的管道截面积就能排出。由于传
统重力式雨水系统无法除去空气，提高其排水能力受到很大的限
制。加之其流速低，雨水中夹带的固体颗粒物容易在水平管道中
沉积。这种雨水系统的低效率是由其结构造成的，特别是安装在
大跨度的建筑屋面上，上述的缺陷显得更为突出。
虹吸式雨水系统（见图3）主要特点是在雨水排泄过程中管道内形成连续的
100%满流状态，这种状态是在虹吸式雨水系统中自然形成的，管网系统中无需进
行特殊安装，无需增加任何电气控制装置和真空装置等。
虹吸式雨水系统不需要专门的安装工具和特殊安装程序，它所使用的管材和
管件与传统的重力式雨水系统是一样的。由于虹吸式雨水系统的水平管道无需设
计坡度，这样可以在天花板上的空间内安装很长的水平排水管，减少埋地水平管
道挖沟、找坡度和土方回填等工程量。
虹吸式雨水系统的设计使得当雨水灌满雨水斗时系统是处于低于大气压（负
压）的状态下运行的。系统管道内的水流可以获得比传统重力式雨水系统更高的
流速，这个流速可以达到0.9~9米/秒。这就意味着降雨量越大，雨水从屋顶排出
速度越快。由于虹吸式雨水系统管道内流速比较高，减少了雨水中夹带的固体颗
粒物在管道内的沉积，具有良好管道自洁性能。当降雨量小的时候，它仍然可以
像传统的重力式雨水系统一样排出雨水。
虹吸式雨水系统（见图4）的特性使得其管道的直径比传统结构要小，例如：
传统雨水系统采用的8吋管道，在这个系统中只需4~6吋就可以达到相等的排水
量。垂直落水管的数量也大大减少了，降低了管道的材料费用和安装费用。由于
这种系统无需在每个雨水斗下设置垂直落水管，它更适合用于大跨度屋面排水。
虹吸式雨水斗技术数据
屋顶面积（M2）
屋顶面积雨水流量换算表（M3/秒）
降雨量强度（mm/小时）102030405060708090100110120130140150160170180
0000000000000000000 500.00010.00030.00040.00060.00070.00080.00100.00110.00130.00140.00150.00170.00180.00190.00210.00220.00240.0025 1000.00030.00060.00080.00110.00140.00170.00190.00220.00250.00280.00310.00330.00360.00390.00420.00440.00470.0050 1500.00040.00080.00130.00170.00210.00250.00290.00330.00380.00420.00460.00500.00540.00580.00630.00670.00710.0075 2000.00060.00110.00170.00220.00280.00330.00390.00440.00500.00560.00610.00670.00720.00780.00830.00890.00940.0100 2500.00070.00140.00210.00280.00350.00420.00490.00560.00630.00690.00760.00830.00900.00970.01040.01110.01180.0125 3000.00080.00170.00250.00330.00420.00500.00580.00670.00750.00830.00920.01000.01080.01170.01250.01330.01420.0150 3500.00100.00190.00290.00390.00490.00580.00680.00780.00880.00970.01070.01170.01260.01360.01460.01560.01650.0175 4000.00110.00220.00330.00440.00560.00670.00780.00890.01000.01110.01220.01330.01440.01560.01670.01780.01890.0200 4500.00130.00250.00380.00500.00630.00750.00880.01000.01130.01250.01380.01500.01630.01750.01880.02000.02130.0225 5000.00140.00280.00420.00560.00690.00830.00970.01110.01250.01390.01530.01670.01810.01940.02080.02220.02360.0250 5500.00150.00310.00460.00610.00760.00920.01070.01220.01380.01530.01680.01830.01990.02140.02290.02440.02600.0275 6000.00170.00330.00500.00670.00830.01000.01170.01330.01500.01670.01830.02000.02170.02330.02500.02670.02830.0300 6500.00180.00360.00540.00720.00900.01080.01260.01440.01630.01810.01990.02170.02350.02530.02710.02890.03070.0325 7000.00190.00390.00580.00780.00970.01170.01360.01560.01750.01940.02140.02330.02530.02720.02920.03110.03310.0350 7500.00210.00420.00630.00830.01040.01250.01460.01670.01880.02080.02290.02500.02710.02920.03130.03330.03540.0375 8000.00220.00440.00670.00890.01110.01330.01560.01780.02000.02220.02440.02670.02890.03110.03330.03560.03780.0400 8500.00240.00470.00710.00940.01180.01420.01650.01890.02130.02360.02600.02830.03070.03310.03540.03780.04010.0425 9000.00250.00500.00750.01000.01250.01500.01750.02000.02250.02500.02750.03000.03250.03500.03750.04000.04250.0450 9500.00260.00530.00790.01060.01320.01580.01850.02110.02380.02640.02900.03170.03430.03690.03960.04220.04490.0475 10000.00280.00560.00830.01110.01390.01670.01940.02220.02500.02780.03060.03330.03610.03890.04170.04440.04720.0500 10500.00290.00580.00880.01170.01460.01750.02040.02330.02630.02920.03210.03500.03790.04080.04380.04670.04960.0525 11000.00310.00610.00920.01220.01530.01830.02140.02440.02750.03060.03360.03670.03970.04280.04580.04890.05190.0550 11500.00320.00640.00960.01280.01600.01920.02240.02560.02880.03190.03510.03830.04150.04470.04790.05110.05430.0575 12000.00330.00670.01000.01330.01670.02000.02330.02670.03000.03330.03670.04000.04330.04670.05000.05330.05670.0600 12500.00350.00690.01040.01390.01740.02080.02430.02780.03130.03470.03820.04170.04510.04860.05210.05560.05900.0625 13000.00360.00720.01080.01440.01810.02170.02530.02890.03250.03610.03970.04330.04690.05060.05420.05780.06140.0650 13500.00380.00750.01130.01500.01880.02250.02630.03000.03380.03750.04130.04500.04880.05250.05630.06000.06380.0675 14000.00390.00780.01170.01560.01940.02330.02720.03110.03500.03890.04280.04670.05060.05440.05830.06220.06610.0700 14500.00400.00810.01210.01610.02010.02420.02820.03220.03630.04030.04430.04830.05240.05640.06040.06440.06850.0725 15000.00420.00830.01250.01670.02080.02500.02920.03330.03750.04170.04580.05000.05420.05830.06250.06670.07080.0750 15500.00430.00860.01290.01720.02150.02580.03010.03440.03880.04310.04740.05170.05600.06030.06460.06890.07320.0775 16000.00440.00890.01330.01780.02220.02670.03110.03560.04000.04440.04890.05330.05780.06220.06670.07110.07560.0800 16500.00460.00920.01380.01830.02290.02750.03210.03670.04130.04580.05040.05500.05960.06420.06880.07330.07790.0825 17000.00470.00940.01420.01890.02360.02830.03310.03780.04250.04720.05190.05670.06140.06610.07080.07560.08030.0850 17500.00490.00970.01460.01940.02430.02920.03400.03890.04380.04860.05350.05830.06320.06810.07290.07780.08260.0875 18000.00500.01000.01500.02000.02500.03000.03500.04000.04500.05000.05500.06000.06500.07000.07500.08000.08500.0900 18500.00510.01030.01540.02060.02570.03080.03600.04110.04630.05140.05650.06170.06680.07190.07710.08220.08740.0925 19000.00530.01060.01580.02110.02640.03170.03690.04220.04750.05280.05810.06330.06860.07390.07920.08440.08970.0950 19500.00540.01080.01630.02170.02710.03250.03790.04330.04880.05420.05960.06500.07040.07580.08130.08670.09210.0975 20000.00560.01110.01670.02220.02780.03330.03890.04440.05000.05560.06110.06670.07220.07780.08330.08890.09440.1000
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虹虹虹虹虹虹
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虹吸式雨水斗安装图
D 346
13071258
10514
公称口径mm 阻力系数
K 最大排水流量（立方米/秒）
DN500.130.0142DN750.160.0396DN100
0.23
0.0481
虹吸式雨水斗选用数据
铸铁铸铝HX1050HX1050L DN5074HX1075HX1075L DN7598HX1100
HX1100L
DN100
120
虹吸式雨水斗尺寸表
型号
公称口径mm D mm
型铸铁雨水斗尺寸表mm
规格DN D
87型雨水斗选用表
t
D1H
87型钢制雨水斗型号表
甲型乙型
碳钢不锈钢碳钢不锈钢87A-75S87A-75SS87B-75S87B-75SS 87A-100S87A-100SS87B-100S87B-100SS
214
D 106
330
13
117
335
比例
A4
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图号
说说：
1、本本本本本本河本本本本本本本本本（天天）板板。
2、雨河雨河本雨，将将将将河将、将河防防防防防防防 口口，填填将河填填填填，即将即板即板，并并防并
栓栓即板栓栓。即板压压本压压防防压压本压压、填密。
雨河雨雨雨
混混混本本板
90型型型型雨河雨
雨斗
本本河屋将屋将雨河即压本本将河将
铸铁铸铝90-HX 50C 90-HX 50L DN506190-HX 75C 90-HX 75L DN758690-HX 100C 90-HX 100L DN100111
90-HX 150C
90-HX 150L
DN150
162
90型虹吸式雨水斗尺寸表
型号
公称口径mm D mm
规格 DN 5075100150定额泄流量（升/秒）
6.0
12.0
22.0
26
90型雨水斗选用表
L1
单单:mm
单单:mm
65型型型型
L
D1
D d
箅箅
180侧侧侧型侧侧
侧侧地地L
L 1
D
H
45°
圆型型型
L
D
L 1
d
L1D
L
H
侧侧侧型侧侧
箅箅
侧侧地地45单单:mm
50L 19676210.566.53675C 75L 108210.566.536100C 100L 90
31
196
133.5100L 100C 903175
220
111
186
36
66.5
210.5133.5公公公公
D H L
L1DN DN
50C
L1DN DN 50C 50L 76196319075C 75L 10561单单:mm
22039751448622050100
公公公公
D H
L 公公公公
D d L L1DN 50102公公公公D D1d L L1DN
100
335
250
111
420
220