雨水斗

The bottom of exterior outwall was covered by iron netting and bricks, which can protect the wall from the rain-wash and the inroad of mice.

外墙底层外侧铺铁网，砌斗砖，在保护墙体不被雨水冲刷的同时，可防止鼠类对墙体的侵害。

But the siphonic roof outlet of system has complex hydraulic peculiaritys、 high velocity of flow and limited capability of dealing with overflow. The error of any design might cause the system invalid or to be insiphonic, furthermore, it can lead to drainage hitch or make big noise, and overflow will appear when the rainfall exceeds the design value of tube. So we should make further studies to consummate the hydraulic peculiarity and the method of calculation continuously.

但虹吸式屋面雨水排水系统中防旋雨水斗的水力特性复杂和系统流速大、超泄能力有限，稍有不慎可能造成系统运行的失效，引起排水故障，或者产生很大的噪声，雨量超过管道设计值时还会出现溢流，从而需要对其进行进一步研究，不断地完善其水力特性和设计计算方法。

In this thesis, I summarize the theoretical calculation method, applied scope and notice of siphonic drainage system, and point out the advantage of siphonic drainage system compared with gravitation drainage system. In the archetype experiment study of siphonic drainage tube, I adopt different tube diameter and different structural height to survey the drainage volume and press in different place. I observe various kinds of flow state, and get chief factors which influence hydraulic peculiarity of system as the tube diameter or structural height, and find out the relevance of factor to flux. I apply CFD Fluent software and adopt standard k-ε model and RNG k-ε model, then use finite volume method and second-order upwind scheme to discrete numerical model, while coupling numeration of velocity field and press is based on SIMPLE. In the numerical simulation of curved part of tube, siphonic drainage tube experiment system and multi-outlet siphonic drainage system, I make research on internal velocity and press of system in different project condition by changing the tube diameter of curved part, negative press value in tube export and improving the quantity of water gutter. This thesis first adopts a method of combining archetype experiment and numerical simulation to study the siphonic drainage system, test and verify the validity of experiment and numerical simulation, and makefurther study on system, it solves the problems of limited testing conditions, and has a logical results, it can provide a valid method for optimizing and designing the drainage tube-net system. The conclusion have referring value for study and design of siphonic drainage system.

本文首先对虹吸式排水系统理论计算方法、适用范围以及注意事项做出总结，并分析了虹吸式排水系统的优势；再对虹吸式排水管道进行原型试验研究，采用不同管径不同立管高度，对系统流量、管道压强进行量测，观察了各种工况下的流态，对其水力特性进行研究分析，找出影响水力特性的落差、管径主要因素以及与排水量的关系；进一步应用计算流体力学Fluent软件，采用标准κ-ε模型与RNGκ-ε模型，计算过程应用有限体积法和二阶迎风格式对数值模型进行离散，速度和压力的耦合采用SIMPLE算法，分别对系统弯管段、虹吸排水管道试验系统、多斗虹吸式排水系统进行数值模拟分析，通过改变管段弯头处半径、管段出口负压值、增加雨水斗数对不同工况下系统内部的速度和压力进行研究；本文首次采用结合原型试验与数值模拟相结合的方法，对虹吸式屋面雨水排水系统进行研究，试验与模拟相互验证，并进行拓展，很好地解决了虹吸式屋面雨水排水系统由于试验条件限制问题，结果正确合理，为排水管网系统设计和优化研究提供了有效的方法，对工程设计有较好的参考价值。

I has a total of nine series over 900 varieties of products, including: W-mouth free for the use of cast iron pipes and drainage pipe, A-type flexible interface with cast iron pipes and drainage pipe, for I used gray iron drainage pipe And pipe fittings, all kinds of high-end decorative and leakage, waterproof deodorant series of anti-theft sealed covers, stainless steel flexible Our expertise, all have carbon steel hoop Elevators, all kinds of iron and steel bucket rain water pipe, cast iron plates and various trench Bizi Non-standard pipe and tube, and other combinations.

我公司共有9个系列900多个品种的产品，其中有：W型无承口排水用铸铁管及管件、A型柔性接口排水用铸铁管及管件、承口排水用灰口铸铁管及管件、各种高档装饰地漏、防水防臭防盗密封井盖系列、不锈钢柔性卡箍、各种碳钢抱箍吊卡、各种铸铁钢制雨水斗及雨水管、铸铁地沟箅子板及各种非标管件和组合管等。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。