A, greening project construction scheme

The object of greening project is living plant materials, and there are many kinds of trees planted with large specifications. Therefore, in order to ensure that the project can achieve the design effect and ensure the survival rate of plants, careful construction and careful maintenance management must be carried out to achieve the predetermined effect.

Greening project construction procedures are as follows:

A. site preparation site cleaning-soil replacement-initial site leveling-soil removal and fertilization

B, selecting seedlings, packaging seedlings, transporting seedlings and transplanting seedlings temporarily.

C, positioning and setting out for seedling planting-digging a planting pit-planting-supporting-pruning-shading-watering.

D preparation of lawn planting site-land leveling and ploughing-irrigation and drainage system-lawn planting construction-post-sowing management.

1, site preparation

(1) Site cleaning: manually clean up the construction waste, miscellaneous irrigation plants and other wastes that affect the construction and the survival rate of trees in the greening site, and transport them to the designated place after cleaning by truck.

(2) Soil replacement: Because greening requires higher planting soil, the soil used for greening should be replaced with soil with rich organic matter, fertile soil and good drainage performance.

(3) Preliminary leveling of the site: according to the design drawings, the planting soil after soil replacement is preliminarily leveled, and the terrain conforming to the design intent is sorted out.

(4) Soil removal and fertilization: 2.5 kg of "Fengshou" 35% water agent and 100- 150 kg of water per mu are evenly sprayed on the soil surface with a sprayer, and then the soil is completely wetted to kill fungi and nematodes in the soil. In the ground cover flower planting area, 2.5KG/M2 compost was mixed into the surface soil by rotary tiller, and the trees and shrubs were fertilized by digging planting pits.

2, seedling preparation

(1) Selection of seedlings: In addition to the tree shape and specifications of seedlings in the design drawings, we should also pay attention to the selection of seedlings with healthy growth, no pests and diseases, no mechanical damage, regular tree shape and developed roots. For large areas of trees and shrubs, it is best to choose trees that have been uprooted, so that seedlings can survive easily.

(2) Seedling packaging: water is poured once every 1-2 days before seedling. When digging bare-rooted seedlings, attention should be paid to the integrity of root system, and roots should be used as little as possible. Too long roots and injured roots should be trimmed, wrapped in straw bags after seedling emergence, and watered and moistened. For seedlings with soil balls, the diameter of soil balls should be 6-8 times of DBH of seedlings, and the thickness of soil balls should be its diameter. The main branches are tied with straw ropes or linen to prevent dehydration, and each leaf of the whole tree is cut off 1/2-2/3, so as to greatly reduce the leaf area and reduce the total water transpiration of the whole tree.

(3) Seedling transportation: When loading and unloading seedlings, handle them with care to avoid damaging seedlings. Seedlings should not be piled too thick to prevent them from being damaged by heat. For the transportation of big trees, hoisting should be used. During the shipment of transplanted trees, the crown should be tied and the trunk should be fixed to prevent the bark from being damaged and the soil ball should not be damaged. Pay attention to safety when operating. When unloading transplanted trees, the main ornamental surfaces should be properly arranged, and the soil balls (or boxes) should be directly put into the planting holes, unpacked and compacted in layers.

(4) Temporary follow-in: as far as possible, plant with the transportation to ensure the survival rate of seedlings. If the seedlings cannot be planted on the same day for some reason, they should be planted by roots, and the roots should be dug into the ditch before the roots are planted. The depth should be able to be buried in the root of the tree, and then the seedlings should be covered with soil and compacted to prevent air leakage, and watered for shade maintenance.

3, seedling planting

(1) Positioning and setting-out: Setting-out shall be carried out according to the construction drawing and the landform with known coordinates, and the planting point shall be determined, so that the trees can be planted accurately and neatly and the planting effect can meet the design intent.

(2) Digging planting pit: artificial excavation, the size of planting pit should meet the design requirements, and Zhu Xing traditional Chinese medicine should meet the design size. When excavating, the top soil should be stacked on one side and the bottom soil should be stacked on the other side; Pieces of flowers, shrubs, ground covers, etc. should be thoroughly ploughed for 30CM, and then ditched for planting.

(3) Planting: The planting hole should be excavated according to the general technical regulations, and the bottom of the hole should be applied with base fertilizer and paved with fine soil cushion. Planting soil should be loose and fertile, and bandages at the roots of trees should be removed. Seedlings should be planted in the planting hole, lifted slightly after filling, and then inserted into the soil and filled to the top of the hole. Finally, a cofferdam should be built around the tree to stop water. When planting bare-rooted seedlings, they should be returned to the soil in layers, and the seedlings should be lifted appropriately to stretch the roots and tamp them in layers. Finally, after the seedlings with soil balls are put into the hole for correction, the soil is cultivated around the soil balls from the edge, compacted in layers, and a water cofferdam is built. The depth of seedlings after planting should be flat or slightly deeper than the ground. When planting other ground cover plants, the planting depth should be determined according to their biological characteristics and discharged into ditches as required.

(4) Support: After the big seedlings and trees are planted, they should be supported by a support frame, so as to improve the survival rate. According to the design requirements and Party A's unified requirements, steel tube portal support is adopted.

(5) Pruning: After the big seedlings and trees are planted, appropriate pruning should be carried out, and broken branches, dead branches and some leaves should be cut off to ensure the tree shape, prevent excessive water loss and be beneficial to survival. Its cross section should be protected with latex or lead mud. After the shrubs that make up the color blocks and hedges are trimmed, they should also be trimmed according to the design requirements.

(6) Watering: After the seedlings are planted, they should be watered immediately, and the seedlings can be watered thoroughly at one time; After planting big seedlings and big trees, fully water them several times until the cofferdam is full of water. The next day after planting, water it again. For big trees, due to the high temperature, we should pay attention to moisturizing and spray water on their trunks, branches and leaves regularly every day to reduce the temperature, reduce transpiration and improve the survival rate.

4. Lawn planting

(1) Site preparation

A. Thickness of soil layer: Because lawn plants are low herbs without thick taproots, in order to maintain the excellent quality of lawn and reduce management cost, the thickness of soil layer should be about 40CM, preferably not less than 30CM, and the soil layer should be thickened where it is less than 30CM.

B. Land leveling and ploughing: After weeds and sundries are cleared, the land is leveled with high filling and low filling for the first time, and then base fertilizer is spread, and then ploughing is generally performed once. The soil is loose and well ventilated, which is beneficial to the root system development of lawn plants and convenient for sowing. In order to ensure the leveling of the newly paved lawn, it should be watered once or rolled twice after changing soil or ploughing, so that the solid and different places will show high and low to facilitate the final leveling.

C. Drainage irrigation system: When leveling the ground finally, the problem of ground drainage should be considered, and there should be no depression to avoid water accumulation. More gentle slope drainage should be used, and slow wave channels should be built in a certain area. The lowest end of the channel can be provided with a rainwater outlet to receive the discharged groundwater and can be discharged through an underground pipeline. The ideal lawn surface should be slightly higher in the middle and gradually inclined to the periphery or edge. Lawn irrigation system is an important project of lawn construction. At present, sprinkler irrigation is widely used at home and abroad. Therefore, the sprinkler pipe network should be buried before the site is finally leveled.

(2) Lawn planting construction: Before sowing, seeds with high purity and high germination rate should be purchased. Before sowing, the seeds can be treated to improve the germination rate. Broadcasting is broadcasting. The company is responsible for lawn sowing technology and agronomist sowing to ensure the uniformity of sowing seeds.

(3) Post-sowing management: fully maintaining soil moisture is the main condition to ensure seedling emergence. After sowing, water can be sprayed every day or every other day according to weather conditions. When the seedlings grow to 3-6CM, stop spraying water, but always keep the soil moist and remove weeds in time.

Second, the civil engineering technical measures

1. Pavement works

A the varieties, specifications, colors and patterns of floor materials must meet the design requirements.

B, paste must be firm, no skew, lack of Angle and cracks and other defects.

C, the surface should be smooth, clean, color coordination, no discoloration, alkaline and significant gloss damage.

D, joints should comply with the design requirements, uniform width, consistent color, not the whole brick use position is appropriate.

(1) construction technology

Construction preparation-site setting-terrain recheck-excavation and filling construction-site leveling-grass-roots construction-surface construction-ground decoration.

It is worth noting that concrete mixing should be carefully fed according to the mixture ratio, and the feeding order is stone-cement-sand-water. Strictly control the water consumption, stir evenly, and the shortest time is not less than 90s. When pouring concrete, the distance between the discharge port and the poured concrete surface shall not exceed 2m, and the concrete pouring shall be continuous; Concrete must vibrate; After tamping, rub it flat with a wooden trowel; After the concrete is poured, it should be covered with water within 12h, and the watering times should be enough to keep the concrete moist. The curing period is generally not less than 7 days and nights. When baking, water with straw bundles in summer and bake with plastic film in winter or rainy days.

(2) Granite paving

A, check the plate before laying, and select and classify its varieties, specifications and quality.

B, remove debris such as garbage on the substrate, water in advance.

C, mark the plate color number on the base, number it according to the pattern direction, and lay it in turn.

D, paving sequence from inside to outside.

E, plate gap to control uniform and straight; Cross joints should be carefully aligned to prevent staggered joints and ensure good results at one time.