Municipal road project roadbed drainage construction technology?

With the rapid development of China's economy, urban road development has become a major component of economic development, and the construction of municipal road drainage project has played a great role in promoting the beautification of the city. This paper analyzes the importance of municipal road drainage pipe construction, describes the problems in the construction of municipal engineering road drainage pipe, and conducts an in-depth study on the construction technology of municipal engineering road drainage pipe.

1 The importance of municipal engineering road drainage pipe construction

At present, the development of urban roads is the main component of economic development, and the construction of urban road drainage project plays a great role in promoting the beautification of the city. Therefore, strengthening the construction of road drainage pipes in road construction can not only effectively protect the ground road, but also promote the discharge rate of urban wastewater and reduce the pollution of the urban environment. Of course, in the design of municipal road drainage pipe, if the design is reasonable, it can protect the urban surface road well during the construction period, and also can ensure the smoothness of road drainage and reduce the degree of damage of rainwater scouring of urban roads. However, if the road drainage project is not reasonably designed, then the road rainwater due to long-term siltation and infiltration into the interior of the road, and damage to asphalt and other construction materials, seriously damaging the surface of urban roads. In addition, during the construction of municipal road drainage project to strengthen its construction level, you can play a certain role in safeguarding the roadbed and other structures.

2 Municipal Engineering Road Drainage Construction Problems

2.1 Construction management system is still not sound and perfect

China's rapid development of the economic level, the process of urbanization is getting faster and faster. In the case of gradually accelerating the pace of urbanization, the construction market has also achieved greater development. However, when it comes to construction projects, there are still various problems, such as management system, construction personnel, construction technology and so on. The construction personnel in China's construction market is mainly composed of migrant workers, which is characterized by high mobility and unfixed construction teams. Generally, construction teams often start to form construction teams only after bidding and tendering for new projects, which is easy to waste time, and the personnel of the construction team changes a lot every year, thus the construction quality of the construction project can not be guaranteed. If the construction team has a good management system, then the construction team personnel is not easy to lose, not only can improve the quality of construction, but also improve the overall construction efficiency of the construction team, but also can make the construction team sustainable development.

2.2 Construction personnel lack of professional professional quality

As the main force of China's construction industry, that is, the migrant workers construction team, they are engaged in construction work for a long time, they will have the opportunity to follow the experienced construction technicians to learn to some of the basic technology, operating methods, etc., but. Professional literacy is still greatly insufficient. Therefore, it will bring uncertainty to the whole project in construction. In addition, the department of enterprise units will be specialized in hiring relevant professional and technical personnel, but due to the shortage of talents, the hired talents are working directly as the leadership, have not been exposed to the actual construction site, making the professional skills lack of direct exercise. This will lead to the continuous development of building construction technology, and the growing distance between the theoretical foundation they have, making them for the construction site management, seriously affecting the construction work.

2.3 Municipal drainage pipe construction supervision is not in place

The construction of municipal drainage lines is very important, but because of its long laying line, it is easy to appear construction problems, so for each construction point need to be strictly supervised. However, in practice, the managers responsible for project supervision often do not pay attention to the pipeline construction, resulting in the actual supervision work, the responsible personnel and related personnel do not pay attention to the supervision work, so that the construction link lack of professional and technical personnel to guide and supervise the lack of professional construction steps, order. Very often, only by the experience of construction personnel construction, is very unreliable, will bring great uncertainty to the construction of the project.

3 Municipal road drainage ditch setup and construction technology

3.1 Drainage ditch setup

Drainage ditch is mainly for the situation of high water table. Due to the small depth of the submerged layer, drainage ditches can be constructed to intercept the groundwater, through the surface drainage, so that its water level is reduced, and thus also known as open ditch. However, it is not suitable to use the drainage ditch in the cold area to prevent the water flow in the drainage ditch from freezing and affecting the drainage. Open ditch structure is simple, low cost, most of the cross-section type is rectangular or trapezoidal.

3.2 drainage ditch construction technology

In the specific construction, the need to use concrete or mortar masonry schist, construction of a row, rows of weeping holes, tilted, located in the trench wall and the intersection of the aquifer, and then the use of suitable materials made into a layer of filtration, filling in the trench wall on the outside, filtering layer of material is mostly coarse permeable or synthetic materials. In addition, expansion joints as well as settlement joints need to be provided. When the trench passes through the boundary of soft and hard rocks, if there is a lot of water in the construction area, the water should be removed before excavation. In addition, the open trench excavation needs to be excavated catchment wells to exclude the water seeping into the pit excavation, the catchment wells need to be dug when the trench pit is dug to the design depth; the distance between the catchment wells and the drainage ditch is maintained at more than 1m.

4 municipal road ditch set up and construction technology

4.1 ditch set up

ditch is the groundwater diversion discharge to the roadbed outside the scope of the drainage ditch, with the roadbed in the groundwater or the roadbed in the flow of water for partitioning, retention and discharge, the underground concentration of water flow, reduce the function of groundwater. From the point of view of hydraulic characteristics, it is a turbulent flow. Such a section is generally rectangular, and the size of each part should be determined according to the water discharge and topographic and geological conditions. The width of the bottom of the ditch is about 0.4m, the depth meets the application requirements, the longitudinal slope should be greater than 0.5%, the outlet should increase the longitudinal slope, higher than the high standing water level of the surface drainage ditch 0.2m or more. In cold areas commonly choose the drainage of the dark ditch, but also to do a good job of anti-freezing measures, you can also choose to set the ditch below the depth of freezing. Setting according to the ditch type of local materials, soil conditions, porous pipe ditch, chaotic rock dark ditch, no sand pipe dark ditch, tile pipe dark river. Longitudinal ditch set parallel to the center line of the road, according to the width of the road to decide to set one or two, transverse ditch and the center line of the road should be 45 ° ~ 90 °, a distance of 10 ~ 20 m. Ditch should be set according to the length and width of the geotextile fabric or groundwater flow particles filtration layer, the flow of water there is no pressure, laminar or turbulent flow, and the supply factors to calculate the location of the ditch. When the groundwater level, water layer is shallow, can be used to reduce the groundwater level and cut off the water ditch, ditch should be buried in the impermeable layer. At the bottom of the ditch, the bottom of a row of seepage holes should be higher than the bottom of the ditch should not be less than 0.2m when located in the roadbed side ditch, should be along the direction of the road, in the low-lying or valley areas, should be set up along the slopes of the gully towards the valley.

4.2 Construction technology of the dark ditch

Dark ditch excavation from the ditch downstream to upstream construction, and the application of pump masonry support. The pit should be formed, installed in sections, excavated and backfilled. The ditch concrete or mortar masonry, in the ditch wall and aquifer height contact surface, set up one or more rows of inclined seepage grooves. The outside of the trench walls should be filled with coarse permeable or synthetic material as a filter layer. When the trench passes through the boundary of soft and hard rock, provide expansion or settlement joints.

5 Conclusion

The quality of municipal engineering road drainage pipe construction directly affects the development of the city, when carrying out the construction, we should do a good job of engineering construction control from the preparatory work, pipeline construction, pipeline installation, and water closure test, etc., in order to improve the progress of the construction under the premise of safety, and to ensure the quality of the construction, so as to provide a guarantee for the life of the people as well as the development of the city.

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