Study On The Planning Of Sewage Pipe Network In Jiaozuo High-tech Zone

Jiaozuo is located in the northwest of Henan Province,Jiaozuo high-tech zone is located in the south of the old city of Jiaozuo,from Xin River in the north to Dasha River in the south,from Zhongnan Road in the West to Ningyuan Road in the east,with a total area of 28.24 km~2.There are altogether 54 roads in the planning area.The sewage pipe network in the high-tech zone has a certain scale,but the sewage has not been able to enter the sewage plant for treatment after being collected through the pipe network.Through analysis,it is determined that the planning area adopts the rain-soil diversion system.In order to facilitate the study of the layout of main,dry and branch pipes in the planned area,according to the current situation of sewage pipe network,land use layout,construction and development timing,etc.,it is divided into seven sewage zones.The existing sewage pipe network in the planning area will be retained and utilized,and a new sewage main pipe will be laid along Nanhai Road,Wenlin Road,Shenzhou Road and Zhongyuan Road.The sewage in other districts will be connected to the sewage main pipe through the sewage main pipes in their respective areas.As the planning area belongs to the service scope of the second sewage treatment plant in Jiaozuo City,the sewage in the planning area will be collected into the second sewage treatment.Since the current sewage pipe network cannot flow into the second sewage treatment plant inlet pipe by gravity,after using the unit construction land comprehensive water consumption index method to predict the sewage volume in the planned area,the average of the gravity flow discharge in the planning area is obtained.The daily sewage volume is 12,500 m~3/d,and the average daily sewage volume increased by the pumping station is 97,100 m~3/d.After comparison,the high-density polyethylene double-wall corrugated pipe(HDPE)with ring diameter<DN800 is determined,the ring stiffness is SN?8;the reinforced concrete socket pipe is used when the pipe diameter is?800.It is determined that the minimum diameter of the starting sewage pipe is DN400,and the buried depth of the starting pipe is controlled at 2.5m-3m.Due to the flat terrain,the flow velocity of some of the starting sewage pipe sections cannot meet the requirements of not being able to flow.Therefore,the auxiliary structures of the pipelines need to adopt the measures of setting up the sinking mud wells and the gate wells to create conditions for the maintenance of the pipe network.In order to reduce the buried depth of the main pipe,it is necessary to set up a sewage pumping station of 100,000 m~3/d.The pumping station covers an area of 5,000 m~2 and the static head is 7.2 m.In order to solve the problem of passing through the bottom of the Xin River by the main pipe,a new river inverted siphon is planned.The inverted siphon adopts a double pipe arrangement,and the length of the single pipe is 210m.This paper analyzes the present situation of the sewage pipe network in Jiaozuo high-tech zone,combining with the general planning,water system planning and other relevant plans,the key problems such as sewage zoning,main pipe trend,plot sewage system layout,sewage volume,pipe network calculation,pipe material selection,management and maintenance are systematically studied,in order to make the sewage planning technically reasonable,for the next step of sewage pipe network design and construction to provide correct guidance.