Sponge Column: Application Analysis of Sponge City in Municipal Road Design

Sponge Column: Application Analysis of Sponge City in Municipal Road Design

As we all know, droughts and floods occur frequently in some cities in China, and some cities still have serious water shortages. At present, the phenomenon of internal shackles in cities is increasing. The root cause is mainly due to the excessive overhaul of urban hardening in China. In the case of heavy rain, a large amount of rainwater will constitute surface runoff, which completely exceeds the urban drainage system. The basic bearing capacity will eventually lead to the emergence of guilt, which causes serious pollution to the city’s water resources. With the emergence of sponge cities, it is necessary to carry out a comprehensive system of governance. To this end, the creation of a sponge city is of great significance.

Basic overview of sponge city

In recent years, “Sponge City” has appeared in front of people as a brand new term. It is mentioned that sponge city is more familiar than most people, but it is not. Sponge belongs to an item with strong water absorption capacity. Sponge City refers to an urban system with strong water absorption performance. Sponge City uses a part of benign water resources management system to effectively use water resources to reduce as much as possible. The occurrence of disasters in the city. At the same time, the construction of the sponge city can promote the construction of the ecological civilization city to a certain extent. Under normal circumstances, the construction of sponge cities needs to start from the following two aspects: First, build an effective urban ecosystem, scientifically and rationally plan the greening of parks, lawns, trees, etc. in cities, and continuously enhance urban reservoirs and depressions. The construction efforts will promote the city’s absorption of rainwater. Secondly, the construction of urban drainage system will be strengthened. For the drainage system, the urban drainage system is the central part. It is important to know that the construction of the drainage system is very important. To this end, it is necessary to strengthen the drainage channel expansion construction and the road permeable road surface area, and rationally layout the underground drainage system. Throughout the actual situation of countries around the world, the scope of application of sponge city is very extensive. In the construction of modern cities, the research and development of sponge city plays an active role. It should be pointed out that there is a big difference between the sponge city and the traditional treatment technology. The construction of the sponge city requires the joint efforts of all the participants. The sponge city has a good degree of interception of the recycling of water resources to a certain extent. The role played a pivotal role in the further improvement of the urban ecological environment.

Can fully improve the urban ecological environment

Sponge city construction should highlight the increase of green area and reduce the proportion of urban hardening area as much as possible. According to relevant data research, it can be understood that urban ground hardening has caused great obstacles to the supply of groundwater to rainwater to a certain extent, resulting in groundwater. The water level simply cannot rise. The construction of the sponge city will increase the urban green space to a certain extent, and further process the rainwater. This part of the treated water source can be reused in people’s daily life and production, and can also be used as groundwater and landscape water. Therefore, the existing urban ecological environment has been fundamentally improved.

Good for reducing urban construction costs

The construction of the sponge city usually focuses on the protection of the natural water system. The existing green space, gardens, wetlands, etc. in the urban body are usually closely related to the water conservancy storage facilities, which will make the drainage pipe concrete project to a certain extent. The amount is greatly reduced, and the municipal construction and operation costs are minimized. In addition, the construction of the sponge city can control the possibility of flood occurrence to a minimum to a certain extent, and bring about considerable social and economic benefits for urban construction and development.

Useful to reduce the probability of urban infighting

Along with the accelerating process of urbanization in China, the impervious area has also increased to varying degrees, resulting in faster and faster ground runoff gathering, increased flood peak flow, and thus the possibility of flood disasters increasing. During the process, the problem of hydraulic overload of urban drainage systems is also frequent. The construction of the sponge city effectively combines prevention and control, so that the overall flood control pressure of the city is significantly reduced, and the possibility of urban flood disasters is kept to a minimum.

Can effectively solve the problem of water shortage

Since 1970, China’s urbanization process has become faster and faster, and the urban population has shown an increasing trend. With the continuous improvement of China’s urbanization level, many cities have problems of water scarcity. However, the construction of the sponge city can promote the supply and demand of water resources to a certain extent. The construction of the sponge city effectively relies on ecological rainwater to a certain extent, effectively solving a major problem of current urban water shortage.

Pavement structure

Through the understanding of the past pavement layer structure design, it can be found that most of them are impervious concrete structures. In the process of building a sponge city, we must completely change the traditional design concept and use asphalt concrete and permeable bricks with good water permeability. However, in the process of sponge city construction, relevant work must be carried out in accordance with established specifications. The selected pavement structural materials should have good noise reduction, anti-sliding ability and water permeability. The use of asphalt concrete for the road surface of motor vehicles mainly has the following phenomena: First, the porosity of the surface layer is large. If rainwater and municipal water seep into the road, it can be discharged directly into the adjacent water absorption facility through the surface layer. Second, assuming that rainwater and municipal water enter the road surface, it must pass through the basement into the blind pipe and then exit the adjacent water absorption facility. Third, this type of road surface permeability is very good, the road surface water can smoothly reach the roadbed, the road surface water reaches the roadbed, and the problems of water seepage, retention, water storage and water purification can be handled together. However, the problem that should be concerned at this moment is that such a permeable road surface is not applicable to heavy traffic roads. In the pedestrian pavement frame, the new water-permeable paving material is used, and the water-permeable paving material can effectively relieve the geothermal effect by dissipating heat and permeable water, and can also maintain the soil permeability, and the rainwater passes through the paved road surface. Entering the underground, it can well meet the relevant provisions of water storage and play an effective role in improving the urban ecological environment. For this reason, in the process of designing municipal roads, special attention must be paid to the permeability coefficient of soil not less than 1*10- 3mm/s, and the permeate surface should be located within 1 meter of the groundwater surface.

Pavement drainage

First of all, pedestrian pavement drainage design. In the design of pedestrian drainage, generally two options are available: first, through the permeable structural layer deep into the underground storage; second, through the drainage base layer, the green belt rainwater collection system is completely discharged. In addition, in the design process of roadway drainage, in order to maximize the use of rainwater, in this case, the designer designed the cross slope on the road surface of the roadway, and successfully introduced the rainwater into the green belt. in. In addition, the green belt can be designed to be concave, which is lower than 6-10 cm compared with the roadway. In the process, a certain range of drainage facilities can be carried out in the entire green belt. Furthermore, rational design can be carried out following the longitudinal section of the green belt and the intensity of the rainstorm in the area. The position of the opening can be made at a certain distance beside the green belt to ensure that rainwater will enter the rainwater collecting system through the opening in the case of heavy rainfall. If there is no green belt in the roadway, then Rainwater needs to pass from the sidewalk through the cover drain and the drain to the grass ditch outside the road. Finally, the design of the green space and the square. The most important part of the construction of the sponge city is the design of urban green space and squares. These two aspects can be said to be the key aspects of rainwater retention and the use of rainwater. In the process of urban green and square design, the use of permeable paving bricks should be continually strengthened, so that the absorption and retention of rainwater by urban green spaces and plazas can be fully reflected, and the way of retaining rainwater can be It turned into a landscape of the city. Under normal circumstances, the green space around the city square can not be lower than the square green area, so that the systemic function of the urban square green space can play a powerful role in the construction of the sponge city.

Conclusion

All in all, in a sense, sponge city is an ideal type of construction in the process of urban construction in the future. It can be said that sponge city is an indispensable condition for the development of modern cities, in the process of modern urban development and ecological economic construction. It plays a significant and significant role. For this reason, the sponge city pilot has very important practical significance. Once the city pilot is successful, we can change the current urban water stress and urban floods to a certain extent, and The urban ecological environment can be significantly improved, and the further establishment of the new ecosystem can greatly improve people’s quality of life to a certain extent, and build a new ecosystem to improve the quality of life of urban residents.