(I) Project Overview: The grassland is planted with grass No.3 of Lanzhou No.3. The basic design is as follows: excavation of the original soil, compaction of the open trench, 170-200mm of backfill, installation of sprinkler system, 200mm of gravel residue, 100mm of sand, yellow mud layer 100mm fertile soil is planted on Lanyin No. 3 planted grass.
(2) Specific construction plans: excavation of earthwork and tamping of the original soil: Excavation of earthwork by excavator is carried out. After being transported out, 6-8 tons of roller compactor is used for layered rolling, and wet water is used for rolling. Excavation of blind ditch and installation of sprinkler system: In the construction of blind ditch, the original soil at the bottom of the ditch must be compacted, and the design requirement of the drainage slope of 0.4% should be guaranteed. When installing the semi-automatic sprinkler system, pay attention to the slope of the embedded pipe and strictly control the elevation of the sprinkler head. If the height is too high, it will affect the use and it will not be beautiful. Too low will be unfavorable to the spray of water mist. Paving grade with gravel layer: According to the design thickness and laying slope gradient tile, it is necessary to ensure the slope but also ensure the flatness.
(3) For turfgrass construction and planting, several aspects should be grasped:
1. Grass species selection: The sports site is located in the subtropical zone in the south. Therefore, the grassland species of Lanyin No. 3 with the ability to resist trampling is selected.
2. In order to guarantee the growth period of the lawn, but also to ensure that the rain can move as early as possible after the rain, so that the planting soil boarding and maintain a certain rate of air permeability, in the construction site, according to the local planting soil sediment concentration, mixed with a certain proportion (About 30-40%) Zhongsha and 5% peat soil.
3. To reduce the turfgrass pests and diseases, reduce weeds, and ensure the healthy growth of the lawn, a certain proportion of lime powder should be mixed (6-7kg per 100 square meters) according to the PH value of the local cultivated soil. Peat soil and cultivated soil are broken together and sieved to remove small stone debris and weed roots. After a certain amount of herbicides are sprayed, they are turned to the sun for sowing.
4. In order to ensure the flatness and evenness of the entire field, mechanical spraying is used for sowing the lawn.
5. During the whole planting and planting process, it is essential to grasp the dialectical relationship between compactness and air permeability, compactness and natural settlement, and water retention and seepage.
(D) lawn construction procedures and precautions:
1. After entering the field, a 20-person workforce will organize and remove weeds that excrete lawns.
2, according to 10 × 10 grid nails excavation pile excavation, and according to the slope design requirements of the site leveling.
3, according to the design of the drawing line, excavation of earth.
4. 200-thick gravel is designed on the ground floor of the football field. One is for the weight of the football field and the other is for seepage. When embedding gravel, attention should be paid to the following issues:
4.1 The level and slope of the gravel layer meet the design requirements of the drawings.
4.2 set, seepage pipe seepage hole is designed according to the drawings.
4.3 The thickness of the backfill gravel should be uniform, distinct, and prevent pipe plugging.
4.3.1 At the end of the original soil with 8-10T roller compaction, to prevent the occurrence of irregular settlement over time, and the emergence of water accumulation nest.
4.3.2 Select the amount of soil and sediment to be cultivated. According to the sediment content, add a certain proportion of medium sand and lime to crush and sieve to remove weeds, especially rubble and broken glass. The treated planting soil was piled at 3m × 3m and each pile was piled with approximately 2.7m3.
4.3.3 From the south to the north, every time the 5 piles are turned backwards and the iron is used to pave the ground, the vehicle is forbidden to go up to prevent people from stepping on the car and resulting in non-uniform compactness and affecting the final flatness of the lawn.
4.3.4 After paving the whole site, use a 2T roller to perform roller compaction: After 2-3 times of lateral pressure, press again for 2 times. Rolling must be regular from one side to the other, and the next rolling must overlap 1/3 of the previous rolling.
4.3.5 After the entire site has been compacted, check whether its density, flatness and slope meet the requirements. If the flatness and slope do not meet the requirements, it must be repaired. When the requirements are met, the density control should be 75±5%. After all meet the requirements, use a shovel with a total width of 60cm, a tooth length of 2cm, and a 2cm tooth between the teeth to loosen the surface 2cm until it is sown.
4.3.6 Before the seed sowing and spraying, according to the temperature of climate conditions, before the soaking of grass seeds in one to two days in advance before the official sowing, in order to prevent the grass seeds from floating, it is also convenient to detect the uniformity of the spray sowing, and add a certain proportion of pulp before spraying. Stick it to the ground, add a certain percentage of paint, and check the uniformity of its spray.
4.3.7 Spraying is completed. To prevent watering or raining, remove the grass seed and cover it with non-woven cloth. Use bamboo sticks to prevent the wind from blowing. 7-10 days emergence should be immediately fertilized, fight drugs to prevent tender grass aphids and the incidence. After fertilizing and fighting drugs, 2cm sand and soil are used to strengthen management. It can be pruned after 2-3 months.
Fifth, the main engineering construction process layout
1. The base bed is sand base planting layer + coarse sand transition layer + gravel drainage layer + blind ditch pipe drainage bed bed structure, and peat, fertilizer, water retaining agent and other materials are added in the planting layer. The thickness is generally 450-550mm, and the particle size and proportion of various materials used are designed according to British standards. The blind ditch is arranged in a parallel pattern with a distance of 7-10 m. The bed slope is 0.3-0.5%. This kind of infrastructure can quickly drain the planting layer and turf water, and can maintain sufficient moisture and nutrients in the soil to achieve the dynamic balance of drainage and water conservation, nutrient storage and utilization, and structure and function. Satisfy the growth requirements of the grass and the requirements for the surface quality of the sports competition. Many club courses in the English Premier League use this basic layer structure.
2. Sprinkler system Sprinkler irrigation system is designed according to international standards. The controllers, nozzles, electromagnetic valves and other major equipment used are all imported products. A total of 24 sprinkler heads are designed for the entire venue, with a 4x6 rectangular layout inside the court. The type of sprinkler used is a buried automatic telescopic nozzle with a range of up to 23.5 meters, a flow rate of 3.5-7.1 meters3/hour, uniform spraying, single-layer coverage of 100%, and double-layer coverage of 85%. The bottom of all nozzles are connected by a lifting frame. The height of the nozzle can be adjusted. The nozzle is small. The exposed surface at the top is only 85mm. A buffer rubber cover buffers the top pressure to ensure the safety of movement. The control system adopts the imported controller to control sprinkler irrigation time and spray irrigation intensity all-weather and fully automatic.
Lawn
3.1 grass species selection of warm season type Lantern cited three knot Zoysia. Lanyin No.3 is a modified type of Japanese knotweed. It has well-developed stolons, strong expandability, dark green color, medium texture, high density, good elasticity, resistance to trampling, high temperature resistance, and strong recovery after injury. Basically, there is no problem of diseases and insect pests, weeds are difficult to invade after landing, and because of their slow growth and low frequency of grass cutting, the cost of maintenance and management is very low. The grass was approved by the National Herbage Variety Approval Committee in October 1994 and registered as a new variety. Suitable for grassland turfgrass in subtropical areas south of the Yangtze River. Compared with Japanese zoysiagrass or Qingdao zoysiagrass, the color is darker green and softer. The green period is one month longer, and the green period in Nanchang can reach 11 months in the whole year. If the water and fertilizer supply is sufficient, it can be fully realized. Green. Due to the excellent comprehensive traits of the grass, it can fully meet the requirements of high-intensity sports competitions, such as stadiums in areas south of the Yangtze River in China (such as Guangzhou Tianhe Stadium, Guangdong Olympic Stadium, Guangzhou Huangpu Stadium, Hangzhou Huanglong Sports Center, and Zhejiang Greentown Soccer Training Base. , Chongqing Lifan football training base, Foshan Science and Technology College football stadium, etc.) is widely used, its outstanding performance has been unanimously praised by users, and has become the grass of choice for grasslands in southern China, especially in South China.
3.2 Method of Building Ping The method of constructing a turf with Lanzhou No. 3 Zoysia grass turf is used to build the Ping. The construction of a turf reel for turf construction needs to be cultivated in advance, because there is currently no pure, high-quality bluegrass 3rd grass in the market.
4. After the laying of the grass is maintained, the lawn will enter the maintenance stage. The main contents of maintenance include cutting grass, sprinkler irrigation, fertilizing, sand-covering, rolling, weeds and weeds. Through the reasonable implementation of the above management measures, promote the growth of the lawn. , one and a half months to meet the use requirements.
5. Quality standards
Lawn color: dark green, uniform.
Turf texture: The width of the blade is less than 6mm, and there is no sharp sawtooth on the edge.
Turf Coverage: 99% Turf Height: ≦ 4cm Cleanliness: No weeds, no pests and diseases.
Turf friction coefficient: 2-12m.
Flatness: ± 10mm, 3m ruler check.
Grade: 3-5‰ Elasticity: 20-50%.
Drainage capacity: seepage rate ≧10mm; drainage rate> 60m3/h (natural drainage),> 180m3/h (forced drainage).
Spraying system: There is no obvious leakage in the pipeline, the computer is automatically controlled, and the coverage rate in the stadium reaches 100%. The specific specifications refer to the "China Football Association Competition Stadium Quality Standards Regulations."
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