Bian Xiao made an inquiry through the architectural knowledge column of "Construction Network", an encyclopedia website of the construction industry. At this stage, the basic situation of vegetation concrete slope greening technology is as follows:
What is the greening technology of vegetation concrete slope?
Vegetation concrete slope greening technology is a new technology for protecting and greening rock slopes by using specific concrete formula and mixed planting seed formula. The core of this technology is the extensive application of cement, which can enhance the strength and erosion resistance of slope protection and quickly create an environment for plant growth. Ecological protection technology of vegetation concrete can not only solve the problems of rock slope protection and rapid greening, but also further enhance the anti-erosion ability of substrate under the joint action of grass-irrigated vegetation and substrate. Ensure the rapid formation of vegetation and ecological stability.
Ordinary net-hanging soil spraying or hydraulic spraying can not achieve permanent stability on high and steep rock slopes, and vegetation concrete technology is a new technology for ecological protection of high and steep rock slopes (concrete slopes and hard rock slopes) above 60 degrees. This technology takes cement as binder and adds special additives. The content of organic matter (fiber+organic matter or humus) is less than 20% (volume ratio), which is composed of sandy loam, plant seeds, fertilizer and chemical fertilizer. This technology has a high degree of mechanization, large production capacity, long spraying distance with dry shotcrete anchor machine, certain strength of sprayed layer and strong anti-scouring ability, and is especially suitable for steep rock slopes. Long-acting fertilizer is a long-acting compound fertilizer for plant growth; Water-retaining agent absorbs water when the water is sufficient and provides water for plants when the weather is dry. Generally, water-retaining agent with particle size of 100 mesh is used. The main function of special additives is to create a growing environment for plants (patented invention of Three Gorges University, Xu Wennian, Liu et al. ); According to the biological growth characteristics, the formula of mixed sowing green seeds was optimized. Seeds are usually irrigated with tall fescue, ryegrass, bermudagrass, Lespedeza, Robinia pseudoacacia, Amorpha fruticosa and Magnolia multiflora.
Construction technology of vegetation concrete slope greening technology;
1, vegetation concrete ecological slope protection construction technology
Vegetation concrete ecological slope protection includes the following procedures: slope trimming, laying and installation of galvanized barbed wire and anchor nails, preparation of vegetation concrete and spraying of vegetation concrete.
2. Slope repair
Remove all obstacles that hinder slope construction. Comprises the following steps: cleaning the vegetation joint. Clean the contact surface of the original slope above the groove line, and the cleaning width is1.0 ~1.5m. It is the transition between the project and the original slope, that is, the junction of vegetation, based on the removal of plant branches on the original slope, without digging out underground rhizomes.
Remove weeds, fallen leaves, dead branches, floating soil and pumice on the slope;
Slope trimming treatment. For the protruding and easy-to-drop parts with obvious dangerous rocks, photograph them. First, drill a hole along the slope in the protruding part with an electric hammer or a pneumatic pick, and then photograph it with a hammer. For areas with obvious depressions, fill them. Use a pneumatic pick to chisel out the pits to be filled, the depth is not less than 1cm, then use high-pressure wind and water to clean them, and finally use M7.5 mortar to fill them.
3. Laying and installation of barbed wire and anchor
Drill a hole perpendicular to the slope with an electric hammer and drive in the anchor nail. Anchor nails shall be φ 14 or φ 16 steel bars, with a length of 30cm~60cm and an anchor nail spacing of1m×1m. The hole depth is 20cm~50cm, and the anchor rod is exposed 10cm. In order to strengthen the stability of the top of the slope, it can be encrypted and lengthened, with a length of 60cm. The anchor nail is slightly inclined, and the included angle with the slope is 95 ~ 100. The anchor nail will be lengthened according to the situation, and the stability of the anchor nail after hitting the slope shall prevail.
According to the designed anchor nail specifications, rock penetration depth and spacing, 14# galvanized wire mesh (mesh 5×5cm) shall be laid after the anchor nails are arranged on the vertical slope. Mesh should be laid from the top to the bottom of the vegetation joint, steel mesh should be laid tautly, and the overlap between meshes should be no less than 5㎝. There is no need to overlap the left and right sides of mesh, but all meshes should be firmly bound with 18# wire, and anchor nail joints should be firmly bound with 18# wire. The net should keep a distance of 7 cm from the slope, otherwise it should be supported by cushion blocks.
4. Preparation of spraying materials
Vegetation concrete consists of sandy loam, cement, organic matter and special additives. The selection requirements of each component material are as follows:
Prepare the materials of each component according to the proportion, and fully stir them with a blender for later use. When mixing the surface substrate, plant seeds should be added according to the design requirements.
5, vegetation concrete spray planting
After the slope treatment, net laying and anchor laying are completed and the components of vegetation concrete matrix are ready, the vegetation concrete matrix can be sprayed. The equipment used for spray planting is a general concrete sprayer, which is divided into base course and surface course. Spray protection should be carried out from top to bottom and from bottom to surface on the slope. The width of each shotcrete board is 4 ~ 6 meters and the height is 3 ~ 5 meters.
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