I. Overview of the Project
This project includes: two basketball courts, 1 tennis courts, two parking lots and their ancillary lighting, drainage facilities, fences, shoulders and pedestrian walkways. Among them, basketball court 1 184 square meters, tennis court 6 14.4 square meters, shoulder and pedestrian passage brick 783.4 square meters, parking lot 967 square meters, tennis court wire fence 427 square meters, basketball court fence 64 square meters, p drainage ditch 168 meters.
Second, the construction scheme and technical measures of EPDM tennis court and basketball court
1, subbase
After positioning and lofting and elevation measurement, the depth and volume of excavated earthwork are calculated, and manual or mechanical construction and bulldozer or loader construction are determined according to the depth and volume of excavated earthwork. Before starting construction, it is necessary to plan the excavation route, excavation sequence, soil stacking area and the driving route of earth-moving vehicles.
When the construction machinery is used, there must be a special person to command it to ensure that no mechanical injury accidents occur.
There is a lot of dust in both manual excavation and mechanical excavation, especially when loading and transporting soil, we should pay attention to sprinkling water frequently to prevent dust from the soil and avoid endangering human health. Because the construction site is close to office buildings and residential buildings, we should pay more attention to dust prevention, so as not to affect the work and rest of employees because of dust.
For the soil scattered in the park during construction, it must be cleaned in time to keep the power park clean.
During earthwork excavation, the excavation depth should be strictly controlled to avoid overbreak and backfilling, which will cause unnecessary disturbance to the foundation and is not conducive to foundation treatment.
(1) Reconstruction and excavation of original foundation:
After positioning and elevation measurement of the whole site, calculate the earthwork depth and square number and start construction. This process includes removing topsoil, excavating earthwork, transporting the remaining soil abroad, leveling the land and compacting the plain soil.
(2) Level and compact the site:
The construction surveyors measure the elevation of the center line and the cross slope, level it to the specified elevation with a scraper, and control the water content of the soil layer to be rolled within 2% of the optimal water content.
The tonnage of the roller should be 8- 12t, the rolling direction should be along the longitudinal road, and the driving speed should be 25-30m/min, until the overlapping rolling is smooth and solid, generally rolling for 5-8 times.
When the road roller rolls the subgrade, the following procedures shall be followed:
A, before rolling, check the loose thickness, flatness and water content of the filled soil layer, and rolling can be carried out only after it meets the requirements.
B, according to the control of loose laying thickness and compaction times provided by field compaction test, carry out compaction control.
C, subgrade real-time filling pressure, using 18-2 1T smooth roller or vibratory roller for rolling; When the vibratory roller rolls, the dynamic and static pressure is weak for the first time, then slow first and then fast, from weak vibration to strong vibration.
D, all kinds of roller rolling speed with slow at the beginning, the maximum speed is not more than 4 km/h; When rolling, the straight line segment moves from both sides to the middle, and the small radius curve segment moves forward and backward longitudinally from the inside out; The transverse joint overlaps the vibratory roller by 50cm, the three-wheeled roller overlaps the width of the rear wheel by 1/2, and the two sections connected front and rear overlap longitudinally1m; No pressure leakage, no dead angle, and uniform rolling. When the rammer is used for real-time compaction, the position of the first rammer should be close to each other, and the gap, if any, should not be greater than 15CM. The second tamping position should be pressed on the gap of the first tamping position. So continue to tamp until the specified degree of compaction is achieved.
2. Gravel cushion
After passing the inspection, the plain soil base shall be used as cushion in time according to the design requirements of drawings. The surveyors shall set the edge line of the cushion and control the length, width and thickness of the cushion according to the design requirements. Thickness 10cm, and the cushion should be flat and dense.
3, asphalt concrete layer
(1) Mixing of Asphalt Mixture
The asphalt mixture is mixed on site by a mixer. The mixing procedure is to mix the aggregate, heat and dry it, weigh it, and then mix it with the weighed hot asphalt to form asphalt mixture.
Mixing of asphalt mixture should be carried out at a certain temperature. The mixing temperature is generally controlled at 150℃- 170℃, and the specific temperature is determined according to the type of asphalt and mixture. Asphalt and mixture must be inspected before mixing, and the mixed asphalt mixture should be uniform without white material, segregation, caking and asphalt overheating.
(2) Transportation
Asphalt mixture is transported to the paving site by dump truck. The temperature of the mixture delivered to the paving site shall meet the requirements specified in the specification. In order to prevent asphalt from sticking to the carriage, a thin layer of mixture of diesel oil and water (oil: water is 1:3) should be coated on the carriage floor.
(3) Paving the road
Preparation of base course: the base course must be smooth, solid and dry, and the elevation and cross slope meet the requirements. Asphalt macadam material is used to fill the defects of base course.
Asphalt mixture paving: measure and set a drill pipe or pier every 10m (every 5m on the curve) at the distance of 30cm-50cm from the road edge on both sides of the stadium, use a level to calculate the elevation of each measuring point according to the longitudinal slope and transverse slope designed by the stadium, set the elevation back according to the construction allowance, hang a steel wire rope on the drill pipe or pier, and fasten it with inverted chains until the steel wire rope does not sag and deflect.
According to the loose paving thickness, pave with a paver at a speed of 4-6m/min, and check the paving thickness every 5- 10m. If problems are found, adjust the height of paver screed in time before moving forward.
(4) Compaction
When the paving progress is 30-60m, when the temperature of asphalt mixture on the paving surface is 1 10℃- 120℃, it will be rolled by a two-wheel smooth roller. Within the range of road width, it should be rolled from edge to middle and from low to high. Overlapping wheel width is greater than 1/2. After static rolling, roll again.
(5) When paving asphalt, embed the iron embedded parts around the grid.
4. EPDM elastic rubber surface layer
Brush a layer (1.5mm) of binder on the surface of asphalt concrete foundation, which can:
Fill the asphalt pavement.
Improve the softening point of asphalt concrete surface to prevent it from softening under sunlight and high temperature.
Improve the adhesion between asphalt concrete layer and EPDM special rubber particle layer.
5. Surface part of EPDM rubber
Material: colored EPDM rubber particles: with high elasticity, sun resistance, wear resistance, aging resistance, mildew resistance, anti-slip, colorfastness and other properties.
Construction technology:
A. quantitatively transport the components to the construction site according to the formula requirements.
B, stirring: firstly, add the components A and B, stir for 3 minutes, then add the catalyst, stir for 2 minutes, and then pour into the paving area.
C scrape the glue with an aluminum alloy scraper to ensure that the thickness of each part meets the design requirements.
D. Trimming: use putty knife to connect the edge seams.
Step 6 draw a line
A. material: elastic acrylic polyurethane line drawing paint.
Material characteristics: wear resistance, no discoloration, strong adhesion.
B. Use the identified steel ruler and theodolite to determine the point line, and refer to the sports technical requirements for the data of each point. The relative error of internal control is 0-110000.
C. paint according to dotted lines and colors.
7, fence construction
During foundation construction, the iron embedded parts of the fence are embedded, and the net is made of plastic steel wire mesh, which is tightened with special tools and then fixed with iron bars and self-tapping screws.
Third, the concrete floor basketball court construction technical scheme
1, subbase, construction method as above.
2, gravel cushion, the construction method is the same as above.
3, C20 concrete surface
(1), raw material preparation
A. Cement: choose PO.32.5 ordinary portland cement, pay attention to the validity period of cement storage, pay attention to its use within the validity period, and pay attention to its inventory, so as to ensure sufficient cement inventory to ensure the construction needs of subsequent projects.
B. Yellow sand: Yangtze River sand is adopted, and the fineness modulus of sand is controlled at 2.3 ~ 3.0 medium sand.
C. Gravel: Single-grain graded gravel shall be used. When stacked vertically, materials should be stacked in different warehouses, and mixed stacking is strictly prohibited.
D construction water: clean river water or well water should be used, and the water should not contain harmful impurities that affect the normal setting and hardening of cement.
(2), install the template
Formwork should be made of steel, and non-standard parts such as bends and minor works can also be made of wood. Template should be intact and have enough strength, its inside should be smooth, straight, local deformation is not more than 3 mm.. When vibrating, the maximum lateral deviation of the formwork should be less than 4mm, and the height should be consistent with the thickness of the concrete panel, with an error of less than 2 mm. Longitudinal seam template tie rod perforation position should be accurate, steel template tongue-and-groove seam tongue-and-groove length error is 65438±0mm, wood template is 2 mm..
(3), concrete mixing and transportation
A, in strict accordance with the design and try to match the selected mixture ratio of mixing concrete, and electronic scale measurement. Each scale must be accurate, and the allowable deviation is: cement < 2 >, sand +2 >, water < 1 >. Before each mixing, measure the water content of coarse aggregate and fine aggregate twice.
B, mixing concrete should be uniform color, when discharging without segregation and bleeding phenomenon, when segregation phenomenon, must be secondary mixing; The dosage should be mixed according to the required dosage; The mixing speed of concrete shall be the speed calibrated in the manufacturer's manual of the mixer; The shortest mixing time shall not be less than 2 minutes from the time when all materials enter the mixing drum to the time when concrete is discharged from the mixing drum.
C, concrete is transported by special concrete truck. In the process of transportation and loading and unloading, there shall be no segregation and bleeding, and the transportation speed shall be able to continuously pour, and no slurry leakage or bulk materials shall be allowed on the way. In the process of transportation, if segregation and bleeding occur, the reasons should be found out and necessary measures should be taken to control the segregation and bleeding of concrete. If there is a small amount of segregation and bleeding when the concrete arrives at the site, it should be mixed manually again, and it is not allowed to change the consistency of concrete by adding water or other methods to ensure the quality of concrete.
(4), concrete pouring
A, before pouring concrete mixture, the impurities, water and dirt of steel bars in the formwork should be cleaned up. The inside of the template should be brushed with release agent, and the joints should be tight to avoid slurry leakage. The location and quantity of steel bars and embedded parts, cleanliness of formwork, structural size and straightness should be checked again, and concrete pouring can only be carried out after passing the inspection.
B, the construction site working face without water, should be kept dry, not directly pouring concrete underwater.
C, concrete pouring, concrete pouring as close as possible to the parts to be poured, try not to move its position, so as to avoid segregation and displacement of embedded parts such as steel bars and templates. When cutting concrete, the free height should not exceed 2m. When it exceeds 2m, facilities such as string tube or chute must be used, and the gradient of string tube or chute should not be too steep, so as not to cause segregation of concrete mixture.
D, when pouring concrete, with 5CM internal vibrator vibrating compaction, vibrating distance should be controlled within the vibration radius, generally 30cm. Vibrating should be carried out in sequence, and the spacing between vibration points should ensure that the action scope of each point is partially overlapped, that is, there can be no missed vibration, over vibration and under vibration. -The vibration duration of each vibration point should ensure that the concrete is fully dense and the vibration degree.-Generally, the concrete surface is in the form of cement paste and will not sink again. ﹚
E, after the completion of each vibrating rod, should slowly advance the vibrating rod. At the same time, avoid vibrating rod collision template, steel bar and embedded parts, so as not to cause the displacement of template, steel bar and embedded parts.
F, concrete pouring to the top, appropriate uses secondary vibrating and secondary plaster, if there is bleeding phenomenon, should eliminate the water on the surface of the concrete.
G, when pouring concrete, should always check the firmness and stability of the template and bracket, and make necessary reinforcement at any time, to ensure the smooth progress of concrete pouring. When pouring, the support frame of the formwork shall not be removed, and the support points of the formwork shall be changed at will. After concrete pouring, the concrete surface should be trimmed and smoothed in time, and then plastered and calendered for the second time. When the weather is bad, we should cover it with plastic sheets to protect it, but before curing, the covering should not be in direct contact.
H, after vibrating, can use roller or vibrating beam and plasterer for leveling, in order to ensure smooth surface and further enhance the uniformity of plate strength.
(5) When pouring concrete, embed the iron embedded parts of the seine grid.
(6), concrete curing
A, after concrete pouring should be covered in time, after the final set should be heat preservation and maintenance. (When the average temperature of the day is lower than -5℃, it is not advisable to spray water for health preservation. Covering time with straw mats and plastic sheets is generally not less than 14d. During the curing period, the number of water sprays per day should be determined according to the temperature, but the concrete surface should be kept wet.
B, curing water should meet the requirements of concrete water, and requires that the water does not contain chemicals or other substances that will pollute the concrete surface.
C. If the formwork cannot be removed within 12h after pouring, the formwork shall be covered to prevent direct sunlight.
4. The fence structure is the same as above.
Four, shoulder and basketball court, tennis court around the pedestrian passage construction technical scheme
1, subbase, gravel cushion and C20 concrete pouring construction scheme are the same as above.
2. Bricklaying
Bricks are made of granite-like cement laths (250×500×60), which are constructed by grouting method and manually laid, and are constructed in strict accordance with design requirements and construction specifications. During construction, the surrounding frames shall be laid first, the diagonal angles shall be adjusted, and the lines shall be hung with framed bricks, so as to ensure smooth surface and straight brick joints.
V. Technical scheme for parking lot construction
1, subbase, gravel cushion, brick concrete pedestrian passage.