Research On Optimization Of Sewage Pipeline Layout In Utility Tunnel

In recent years,with the rapid development of urban land-based construction in our country,supporting infrastructure construction has also been promoted.As a way to make full use of urban underground space resources,the city underground utility tunnel has gradually become the trend of urban modernization in the 21 st century.The construction and development of municipal utility tunnel can promote overall coordination,save space resources,ensure urban security,reduce urban costs,and improve management.At present,from an overall perspective,there are still many deficiencies in the planning and design phase of the construction of an utility tunnel.Therefore,it is urgent to conduct in-depth research on the planning and design of the utility tunnel.Under the background of the implementation of all utility tunnel,according to the current status of the construction of underground utility tunnel in China,and reading related documents such as utility tunnel and construction projects,the entry of rain and sewage pipelines is a challenge in current planning and design..In the current planning and design,there are few cases of rainwater sewerage entering the tunnel.In the selection of suitable areas,the rainwater sewers are included in the evaluation system that is not yet suitable.The problem of subdivision of rainwater sewers and the selection of pipes need to be certain.Theoretical support.Based on the collection of domestic and foreign literature and the opinions of domestic municipal design experts,a rainwater sewer pipeline entrance evaluation system was established based on the analytic hierarchy process,multi-objective optimization methods and spatial interaction theory for the problem of rain sewer pipeline entrance.It also provides a theoretical basis for the selection of pipes and subdivisions.From the planning conditions,the conditions of sewage pipelines,the construction conditions of the utility tunnel and the economic conditions,the factors that have a significant impact on the rain sewer pipeline entrance were summarized,and the suitability evaluation system of the utility tunnel sewer pipeline entry was preliminarily combinated.Layering.Afterwards,an expert consultation method was used to revise the preliminary drafted indicators,and to evaluate,score and calculate the weights.An evaluation system for rain sewer pipeline entrances was constructed to analyze the rain sewer pipelines within a certain planning area.The specific road provides a certain reference for planning and design.The characteristics of the sewer line,the common pipe used in the sewer line,and the requirement for the pipe line in the sewer line entrance are described.The characteristics of the commonly used sewer line pipe are preliminarily summarized,that is,roughness,service life,impermeability,corrosion resistance,installation Difficult and easy and comprehensive cost,and based on these six kinds of pipe characteristics,combined with fuzzy mathematics method to objectively evaluate the characteristics of different pipe materials,establish a multi-objective optimization model,and further calculate the above-mentioned six characteristics in the integrated pipe gallery using Delphi method.The weight of the time,the decision results of the selection of sewer pipes into the corridors were further obtained,which provided a reference for the design of utility tunnel.Afterwards,combined with the space interaction model,using the universal gravitation formula,we constructed a pipeline interaction model in the pipeline gallery and calculated the impact between the sewer pipeline and the common pipelines in the pipeline gallery.It is usually referred to whether or not the sewer pipeline can be compared with other pipelines.It is of great significance to reduce the cost of utility tunnel.Finally,an example of utility tunnel design planning in a new urban area in the north is used to analyze the research contents.Analyze the suitability of the rainwater pipelines in the planning area,evaluate the planning conditions,the conditions of the sewage pipelines,the construction conditions of the utility tunnel,and the economic conditions of the four roads for the planning and construction of sewage pipelines in the area,and select the five routes of the Fairview.Include sewer lines.Afterwards,multi-objective must be selected for the pipe of the sewer line of the corridor,and the high-density polyethylene pipe with good physical and chemical properties and good hydraulic parameters is finally determined as the sewer line pipe of the corridor.Finally,analyze whether the sewer line can be integrated into the general corridor of the pipe gallery and calculate the safety distance between the sewer line inside the pipe corridor and the water supply line and the reclaimed water line for designers' reference.