The important role of permeable bricks in sponge cities and their effects on roads
The principle of the construction of the sponge city is that the city has the flexibility to respond to environmental changes, and it can absorb and store rainwater and use it. Therefore, in the construction of the sidewalk of the municipal road of the sponge city, it is necessary to achieve a reasonable stagger of drainage channels and pavement engineering to ensure that the drainage function beside the road guarantees the stability of the underground water storage function. This article discusses the passing aspects of subgrade engineering, pavement engineering, and drainage engineering on the sidewalks of the sponge city municipal road. Keywords: sponge city municipal road construction skills key 1 sidewalk construction pre-operation 1.1 scientific selection of original data good original data is the foundation of road construction, no matter how good construction skills are used, if the original data is not qualified, it will lead to a large construction quality discount. Therefore, in the selection of the original data of the pedestrian route, the quality of the project must be satisfied first, and the water permeability and drainage function of the original data must have a higher standard. In the past, the original materials of the sidewalk were mostly selected from the data that asphalt may be softer than cement, and its water permeability and drainage function were not satisfactory for the construction requirements of the sponge city. Therefore, the sidewalk paving level should be: the first layer is to select the crushed stone block with strong water permeability; the second layer is to lay the pervious soil layer to filter the impurities in the water; the third layer is to use more than 20cm of permeable concrete To ensure the stability of the pedestrian road surface; the fourth layer selects graded crushed stones; the fifth layer is anti-seepage soil weaver to ensure water storage function. 1.2 Choosing a suitable construction unit Excellent construction units determine the quality of the entire project. Selecting skilled construction personnel, hiring experienced technicians, and selecting highly responsible construction leaders determine the overall quality of a construction unit. . Sponge city construction has high technical requirements for construction. Therefore, the construction of each link requires the close cooperation of skilled personnel and construction personnel. The strict control of the construction person in charge can ensure that the construction is promoted steadily and the project quality reaches the expected requirements. 1.3 Discussion of drawings The discussion of engineering drawings is the most important operation in the early stage of construction. Before construction, the drawings should be discussed carefully, and every part of the drawings should be thoroughly studied. If it is not clear, it should be submitted in time. Solve the problems one by one to ensure that no mistakes are made in the construction process, and to ensure the construction progress and cost control of the construction together. Therefore, the drawing discussion work before construction is particularly important. 1.4 Roadside Water Permeability Planning The main sidewalk is used as the road with lower load. In its planning, pervious board can be used. On the ground floor, concrete with better water permeability can be used for paving. Crushed stone can be considered for cushion. An ecological isolation layer is set up between the roadway and the sidewalk without affecting the subgrade operation, and a gravel ditch of about 30 cm is added within the sidewalk scale. The depth of the gravel ditch can be defined according to the depth of the subgrade's working area Through the gravel seepage layer on the sidewalk and road basement layer, the rainwater can see well. 2 Construction plan 2.1 Pedestrian road bed backfilling 2.1.1 Mixing of the mixture Because the mixing of the mixture is generally concentrated off-site, it is necessary to control the lime content during the mixing process, because the amount of lime affects the bottom of the road. The quality and the strength of the roadbed have a great impact. The roadbed must be treated with 6% of lime soil, and the water content must be reasonably controlled to ensure that the water content during day construction is higher than the normal water content by one to two. The percentage point guarantees that the water loss caused by transportation and other reasons can be compensated in time. 2.1.2 Paving Before the paving operation is started, the upper side of the sidewalk must be ensured to be wet, and the foundation can be watered. When mechanical construction is required, manual repairs must be performed together during construction. In order to ensure that the sidewalk planning follows the organization of the planning drawings, real-time monitoring of issues such as the thickness of loose paving is required. 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, the structural layer should be fully rolled immediately. Use the road roller to statically press the road surface at a constant speed, then the vibratory roller first performs the constant-speed weak vibration and then the strong vibration is rolled. Finally, the static pressure of the smooth roller is finished. 2.2 Construction of Pedestrian and Vehicle Separation Belts Because the separation belts are close to the roadway, the structure of the roadway structure will not be changed during the construction process, and will be filled to the vertical orientation. During the construction process, the plan according to the drawings should be strictly followed. When the excavator is inoperable, you can choose to use an oil hammer to break and then perform excavator engineering operations. 2.3 Sidewalk structure layer construction on both sides The first task of sidewalk construction is to control the pile according to the center line of the road, and release the side line of the road through the theodolite. Use the curbstone seam as the tangent point, and then ensure the smoothness of the line, followed by the curbstone device. Generally, the two-line control method is used to perform the curbstone device. The straightness and elevation of the upper inner mouth line Take control. Change the orientation of the vertical pole device according to the change point of the line type. Usually, the device is installed in sections at the intersection to avoid the entire cut of the curb stone. Strict device control is performed according to the plan of the construction drawing to ensure that it is not presented during the construction process. Problems to ensure the quality of the project. 3 Pavement permeable brick selection and pavement construction 3.1 Pavement permeable brick selection Pavement permeable brick selection: Pavement permeable bricks must be filled with permeable bricks (or water-permeable bricks) that are strong and permeable. On the principle of satisfying pedestrian use and permeability requirements, and in order to meet the cost of the descent project, the permeable brick should choose a product of the size of 300 * 300mm. Too small standard products will reduce the aesthetics of the entire paving. The thickness should be 50-60mm, and the water permeability should be 5-10mm / s. In this way, it can be ensured that the sidewalk can reach the immediate and dry effect under moderate to light rain. Pavement permeable brick selection index: The quality requirements of the brick itself are becoming more stringent when purchasing permeable bricks for public roads. When purchasing permeable bricks , you can investigate whether the brick surface is flat and show uneven pinholes from the side; together, you can tap the permeable bricks to hear whether the sound is loud, and the sound is more brittle, indicating that the texture of the permeable bricks is high in density and hardness. Better. If necessary, test the strength and water permeability of professional permeable bricks to ensure the quality of the project and extend the entire service life of the road. 3.2 Pavement construction of pavement permeable bricks (1) Positioning and elevation calibration are mainly based on the sidewalk planning drawings, and then the external appearance of the ground floor is reviewed to rectify the areas that are not satisfied with the construction requirements; (2) According to the elevation and the hanging of the middle and side (3) Before paving the sidewalk bricks, first lay a layer of cement mortar for leveling, and then lay the permeable bricks ; (4) Trial and test: Before laying, each permeable brick should be tested and tested according to the orientation and viewpoint. After the test, they are placed according to the numbers in two directions, and then discharged according to the numbers. Before the formal paving, a trial row should be performed; (5) The initial thickness of the mortar should be determined according to the horizontal line, and the cross line should be drawn. Use a trowel to level it, and the thickness of the mortar should be appropriately higher than the horizontal line. 4 Precautions After the sidewalk project is completed, we must maintain the sidewalk. During the maintenance period, it shall not be trampled, and within 10 to 15 days, it shall not be rolled over by heavy vehicles. During the construction and maintenance period, warning signs or banners shall be set up to inform the people of municipal administration. Please detour during road construction; the sidewalks should be paved with concrete in one day. The process of unloading, pouring and tamping concrete from the mixer should not exceed one hour. During the laying of sidewalk curbs and road bricks, attention should be paid to the quality of the construction to ensure that rainwater can be discharged, and the stability and safety of the road surface should be ensured to satisfy the normal use of pedestrians. The orientation of the road bricks should be slightly higher than that of the road side stones, so that the rainwater can be quickly discharged without the accumulation of water affecting the normal operation.