Permeable brick technology construction scheme of urban road
The intention of the sponge city is that the city has the flexibility to respond to environmental changes. The permeable brick can stop the absorption and storage of rainwater and use it. Therefore, in the construction of the sidewalk of the sponge city's municipal side, the permeable brick must achieve a reasonable intersection of drainage pathways and pavement engineering, and ensure that the drainage function beside the road ensures the fluctuation of underground water storage function. This article discusses the passing aspects of permeable brick subgrade engineering, pavement engineering, and drainage engineering from the sidewalks of the sponge city municipal road. Keywords: Sponge city municipal road permeable brick construction skills key 1 sidewalk permeable brick construction late mission 1.1 scientific selection of good raw materials for permeable bricks is the foundation of the journey, no matter how good construction skills are used, if the raw materials are not qualified, it will cause the whole The construction quality is greatly reduced. Therefore, in the selection of the raw materials for the pedestrian path, the quality of the project must be satisfied first, and the water permeability and drainage function of the raw materials must have a higher standard. In the past, the raw materials for sidewalks were mostly selected from asphalt, which may be softer than cement, and their water permeability and drainage function were unsatisfactory to the needs of the sponge city. Therefore, the sidewalk paving level should be: the first layer is to select the gravel with strong water permeability; the second layer is to stop the laying of the seepage soil layer, the intention is to stop the filtration of impurities in the water; the third layer is to use more than 20cm of permeable concrete Ensure the erratic nature of the walking surface; the fourth layer selects graded crushed stones; the fifth layer is anti-seepage geotextile to ensure water storage function. 1.2 Choosing a suitable construction unit Excellent construction units choose the quality status of the entire project. The selection of skilled construction personnel, the employment of experienced technicians and the selection of highly qualified construction personnel determine the overall essence of a construction unit. . The construction of the sponge city has high technical requirements. Therefore, the construction of each link requires the close cooperation of skilled personnel and construction personnel. The strict control of the construction personnel can ensure that the construction is promoted steadily and the project quality reaches the expected requirements. 1.3 Discussion of drawings Mission The discussion of engineering drawings is the most important work in the early stage of construction. Before construction, the drawings should be stopped and the detailed discussion should be stopped. Each part of the drawings should be thoroughly studied. The unclear center should be proposed in time. The results are processed one by one to ensure that no mistakes occur in the construction process, and to ensure the construction progress and cost control of the construction together, so the mission of drawing discussions before construction is particularly important. 1.4-mile sidewalk water permeability planning The main sidewalk is used as a low-load path. In its planning, it is possible to choose a water-permeable slab, and to participate in the suspension of the concrete with good water permeability on the ground floor stability. The cushion can consider the selection of gravel. An ecological isolation layer is set up between the roadway and the sidewalk without affecting the mission of the subgrade, and a gravel ditch controlled by 30 cm is added within the sidewalk scale. The depth of the gravel ditch can be based on the depth of the mission area of the subgrade. It is defined that the seepage of the rainwater can be ensured by the gravel pervious layer on the sidewalk and road basement. 2 Construction plan 2.1 Pedestrian backfill of bed 2.1.1 Mixing of the mixture Because the mixing of the mixture is generally concentrated off-site, the lime content must be controlled during the mixing process. The quality and the strength of the roadbed have a great influence. The roadbed should be suspended by 6% of lime soil, and the reasonable control of water volume should be suspended to ensure that the water content during daytime construction is one to two percentage points higher than the normal water content. To ensure timely replenishment of water loss caused by transportation and other reasons. 2.1.2 Paving The paving mission must first ensure that the pavement base is moist and can be stopped by watering the foundation. When machinery is required for the mission industry, manual repairs must be performed together during construction. In order to ensure that the plan of the sidewalk is arranged according to the planning drawings, the results such as the thickness of the loose paving must be monitored in real time. 2.1.3 Rolling and leveling When the paving length exceeds a certain area and the moisture content of the mixture reaches a normal value, one-sided rolling of the structural layer should be stopped immediately. Use the roller to stop the static pressure on the road surface while insisting on the uniform speed, then the oscillating roller first stop the uniform speed weak vibration and then stop the strong shock rolling, and then start with the static pressure of the smooth roller. 2.2 Pedestrian-vehicle separation belt construction Because the separation belt is close to the roadway, the roadway structure layer will not be changed during the construction process, and the false filling will be suspended to the vertical edge position. During the construction process, it is necessary to strictly follow the plan of the drawing. When the excavator is inoperable, you can choose to use an oil hammer to break and then stop the excavator engineering operation. 2.3 Sidewalk structure layer construction on both sides The primary responsibility for the construction of both sides of the sidewalk is to control the piles according to the centerline of the distance, and release the sidelines of the distance through the theodolite. Take the edge of the curb stone as the cut point, and then make sure that the line is smooth, followed by the equipment to stop the curb stone, the commonly used double-line controlled wrist, the equipment to stop the curb stone, and the straightness and elevation of the upper inner mouth line. Manipulation. Change the position of the vertical pole equipment according to the change point of the line type. Generally, the equipment is suspended in sections to avoid the overall cutting of the curb stone. The severe equipment control is suspended according to the plan of the construction drawing to ensure that it does not appear during the construction process. Achievements to ensure the quality of the project. 3 Pavement permeable bricks selection and pavement construction 3.1 Pavement permeable bricks selection: Pavement permeable bricks must be filled with pervious bricks (or permeable bricks) that are strong and permeable for pavement. In order to meet the requirements of walking distance and water permeability requirements, in order to be able to meet the cost of the descent project, permeable bricks should choose products of the size of 300 * 300mm. Products that are too small will constitute a beautiful level of overall paving. About permeable bricks The thickness should be 50-60mm, and the water permeability should be 5-10mm / s. This can ensure that the sidewalk can reach the role of immediate and dry under the condition of moderate to light rain. Pavement permeable brick selection goals: The purchase of permeable bricks for public roads has more stringent requirements on the quality of the bricks themselves. When buying permeable bricks , you can observe whether the brick surface is flat and pinholes of uneven thickness appear from the front; together, you can tap the permeable bricks to listen to whether the movement is loud and clear. The more brittle the movement, the more dense the texture density of the permeable brick . High and better hardness. If necessary, stop the testing of the strength and permeability of professional building materials for permeable bricks to ensure the quality of the project and extend the overall service life of the route. 3.2 Pavement construction of pavement permeable bricks (1) Firstly stop positioning and elevation calibration based on the sidewalk planning drawings, and then stop the review of the exterior of the ground floor, and suspend rectification for the center that is not satisfied with the construction requirements; (3) Before stopping the paving of sidewalk bricks, first lay down a layer of cement mortar to stop leveling, and then stop paving the permeable bricks ; (4) Trial and test: Before laying, each piece of permeable bricks should be stopped in accordance with the orientation and viewpoint. After the trial, the furnishings were suspended according to the intent of the two targets, and then discharged according to the numbers. Before the formal paving, a trial row should be suspended; (5) In the later stage of the mortar laying, the virtual paving thickness of the mortar should be determined in accordance with the degree line, and the cross line should be pulled. After paving, pass the scraper bar, Take a photo and level it with a trowel. The thickness of the mortar should be appropriately higher than the line. 4 Attention matters After the sidewalk project is over, we must suspend the maintenance of the sidewalk. During the maintenance period, it shall not be trampled, and within 10 to 15 days, it shall not be rolled or rolled. During the construction and maintenance period, warning signs or banners shall be set up to inform the people. Please detour during the construction of the road; the paving of the sidewalk shall be suspended within one day, and the process of unloading, filling and tamping the concrete from the mixer shall not exceed one hour. During the laying of sidewalk curbs and road bricks, we must pay attention to the quality of the construction, ensure that rainwater can be discharged, and also ensure the stability and safety of the road surface to satisfy the normal use of pedestrians. 5 Concluding remarks With the constant advancement of China's urbanization process and the volatile growth of the economy, China's urban population and car ownership have increased from time to time, which puts forward better requirements for municipal roads. In order to effectively alleviate the city's traffic pressure and improve the condition of urban road pavement, in recent years, the municipal road pavement has been transformed into a popular achievement for urban establishment. In the practice of construction, in addition to doing a good survey before construction, In the process of transformation, it is also necessary to select advanced building skills, and then advance the quality of road reconstruction and reduce costs.