Planting roof design and construction application technology

Degree according to the choice of garden plants should not be less than. 4mm thick). The concrete structure layer should adopt the structure self-waterproof, the thickness should be higher than the standard design of the general roof standard, the waterproof should not be less than two, the combination material property of different waterproof materials should be compatible.

The purpose of the aquifer abatement is to improve the ventilation of the lightweight matrix and to prevent excessive moisture in the matrix and a reduction in relative air voids. Not only is it not conducive to plant root respiration and microbial activity, but severely it will lead to plant death, and the precipitation in the planting matrix will be discharged into the roof piping device.

Drainage and storage aeration plate should have good bearing capacity, light weight, long life, convenient transportation and installation. Ensure that there is good water permeability, permeability (thickness should not be less than 20mm, material used PP material).

The function of the filter layer is to prevent the artificial lightweight matrix from being washed away and causing some fine water particles to be lost with water, affecting the composition and nutrients of the matrix, and clogging the storage and drainage system. Caused poor drainage of planted roofs and affected plant safety.

Reduce roof load, facilitate construction and transportation, and protect natural soil resources. Prevent the destruction of natural soil resources due to roof greening.

As the roof and artificial underground facilities cover the building with bearing weight problems, if the complete use of natural pastoral soil (custom soil) as planting soil, due to its soil permeability, porosity, drainage rate are affected, it will cause poor plant growth. The roofing planting substrate must meet the conditions for plant growth, such as water storage capacity, pore volume, nutrient substances, fertilizer retention capacity, permeability, space stability (full root growth space), and balanced artificial light weight matrixes of various physical and chemical indicators.

Green roofing and artificial underground facilities should be selected micro-spraying, irrigation system. Designed according to roofing planting needs.

Plants planted in green roofs to avoid lodging or damage due to the influence of wind are very necessary to fix the plants. Measures such as artificially fixing the plant roots may be adopted depending on the circumstances. Solve the fixed windproof problem of roof greening plants.

The greening of the roof is different from the greening of the ground. Special attention must be paid to the thermal insulation effect, volumetric expansion coefficient, soil porosity, water retention, drainage rate, etc. of the planting substrate. At the same time, the fertility needed for the greening of roof plants should not be too large, which may cause rapid plant growth. , increase the burden of the load and maintenance costs. Increase the destructive power of plant roots.

Green roofing lightweight matrix, has good water retention, irrigation should not be excessive, so that plants grow too fast, loss of nutrients, reduced overall resistance.

Beijing Economic Daily News Roofing Planting Greening Demonstration Project 1. Economic Daily News Roofing Greening Background Information: This project is the main building project of the Economic Daily, the new office building. The new office building is a comprehensive building energy conservation project using a variety of new materials.

The greening of the roof is used as a new office building, environmental protection and energy saving plan project, and a single independent project is implemented.

2. Greening of the main office building of the Economic Daily: The new office building of the Economic Daily is located in Xuanwu District. The main office building is 16-storey. The top floor of the 16-storey building covers an area of ​​1,200 square meters, of which 800 square meters can be greened.

Plant landscapes are the mainstay, making full use of the limited green area to display more plant configuration forms and improving the participation and comfort of personnel in rooftop activities.

The overall greening landscape should take into account the bird's-eye view.

Appropriate dotted garden accessories, such as wooden kiosks, wooden flower racks, leisure pools and so on.

4. Economic Daily News roof greening new technology: Pay attention to the diversity and richness of plant species, and reflect the diversity of green landscapes.

Consider the low-cost maintenance of roof greening promotion, especially the application of drought-tolerant plants.

Application of new waterproof material 9 German products).

Application of a new type of storage water-breathable material (produced by the Beijing Green Grace Company) performance-compressive strength 163T/itf (Test Reference Implementation Standard SL/T235-1999) Quality Water Storage Capacity Water Drainage Rate Material is a 20-mm-thick high-resistance punch (pp) Polypropylene. Specification is 335x 5) Use of new ultra-lightweight greening substrate (produced by Beijing Greenset Corporation). 5. Economic Daily Main office building greening technology implementation: 5.1 The live load of the main office building roof load roof is 200 kg/m2.

The static load of the roof is 300 kg/m2, which is composed of all the structural layers including the weight of the roof waterproofing layer, insulation layer, protective layer, root barrier layer, drainage layer, filtration layer, planting matrix layer, and the like. And the density of the used material is the density in the saturated water absorption state.

5.2 Main office building roofing waterproofing layer: SBS modified bitumen waterproofing material primer foam insulation and waterproof material protective layer insulation waterproofing (German products) laying 3cm thick mortar to protect the screed.

Drainage storage air-breathing board: (produced by Beijing Green Grace Company) Light-weight matrix planting layer: (produced by Beijing Green Grace Company) Physical and chemical index unit Ordinary greening lawn Balcony greening Interior landscaping Large porosity (capacity) % 4040>4040 Permeability coefficient 6.1 Planting principle: The economical area of ​​the main office building of the Economic Daily is relatively small. It requires a certain degree of staff participation, and the ornamental nature is stronger. Therefore, the design is based on 5.3 lightweight planting substrates: mainly plant landscapes, both small paving, garden road seats and appropriate garden accessories. In order to make full use of the current resources, the greening of the roof is determined: it will provide visitors with space for recreation while highlighting the ecological benefits.

Through the appropriate undulating landform treatment, the combination of simplified and complex roof greening.

The plant configuration is based on the natural community stratification structure. According to natural laws, the vegetation is mainly composed of small trees, shrubs and ground cover.

6.2 Principles and criteria for roof greenery plant selection: Minimize the application of tall trees, plant shallow roots, drought-tolerant small trees (shallow), shrubs, sub-shrubs, ground cover plants and perennial flowers, and vines.

Choosing shallow rooted plants that are suitable for planting on shallow substrates will reduce the impact of plant roots on building waterproofing.

Long-stemmed plants are the main choices, avoiding plant growth year by year, and increasing the impact on the static load of buildings.

Pay attention to the restoration of urban biodiversity and the principle of plant symbiosis. The selection of plants should not be a single type of plant selection: 7. The technical points for roofing greening of the Economic Daily are summed up: 7.1 The calculation of the construction load of the Economic Daily is about 500 kg/m2. The static load is 300kg/m2. Therefore, the greening of the roof must be carried out with integrated lightweight technology.

7.2 The thickness of the roof greening structural layer is only 25-60cm, including the roof waterproof layer, insulation layer, protective layer, root barrier layer, drainage layer, filtration layer, and planting matrix layer.

7.3 Due to the different requirements of green planting on roof load-bearing capacity, the issue of local load and uniform load should be considered as a whole.

7.4 Greening roof As far as possible, weight elements such as flower racks, ponds, and rocks shall be installed in the building's load-bearing walls and columns.

7.5 Drainage slope: In order to avoid the need for roof greening on the roof of the Economic Daily, the roof drainage slope is set to 2%. 7.6 Economic Daily News Roof Greening Plant Root Growth Depth: Economic Daily House Roofing Green Plants Suitable Planting Substrate Depth Schedule Plant Type Substrate Depth Small Tree Shrubs Small Bushes Ground Cover Plants Perennial Flower Lawn 7.7 Economy Daily Roof Greening Technical Indicators Economic Daily Roof Greening Technical Specifications Green Area Total Green Area Paved Park Road The total area of ​​the green area The area of ​​the garden pieces The total area of ​​the green area The ratio of the trees, lawns and lawns in the green area of ​​the roof 7.8 Breakthrough points in the roofing of the Economic Daily: Emphasizing the principle of plant species diversity and establishing the basis for biodiversity; Advocating natural simplicity The greening style, the establishment of a natural community type vegetation planting; a large number of low, drought-tolerant ground applications, lay the foundation for low-cost maintenance of roof greening.

The comprehensive application, integration and reference of roof greening technology at home and abroad, and then establish a scientific basis for the determination of roof greening technology.

In combination with the construction of energy-saving demonstrations of the Ministry of Science and Technology, the concept of roof greening was introduced into the comprehensive energy-saving demonstration projects, which will further promote the society and promote the construction of roof greening.

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