一级建造师防护工程类型和适用条件（Primary architect types and conditions of protection works）.doc

一级建造师防护工程类型和适用条件（Primary architect types and conditions of protection works） I. types of subgrade protection works Subgrade protection engineering is an important facility for preventing and controlling subgrade diseases, ensuring the stability of subgrade, improving the environment landscape and protecting the ecological balance. Its types can be divided into the following two kinds: (1) slope protection; Slope protection is the main protection of subgrade slope surface from rain erosion, effect of slow temperature difference and the temperature change, prevent and delay the weathering of soft rock soil, surface cracks, erosion evolution process, so as to protect the overall stability of the subgrade slope, to a certain extent, but also beautify the road, the coordination of natural environment. 1.. Plant protection: planting grass, laying sod and planting trees. 2. engineering protection (aggregate protection): protective box, cover, curtain wall, dry rubble slope protection, mortar rubble masonry and precast block revetment, anchor wire mesh shotcrete shotcrete slope. (two) erosion and protection of riverbank along river; 1., direct protection: plants, stone masonry, stone cage, retaining walls, etc.. 2., indirect protection: spur dikes, along the dam and other governance structures, as well as the river to create a forest belt. Two, all kinds of protective works applicable conditions (I) plant protection 1., grass protection: suitable for slope stability, slope erosion by the rain slightly, and easy to grow grass embankment and cutting slopes. The root, stem, low growth for many years and is suitable for the local soil and climatic conditions of grass planted in 40cm (no soil, surface soil layer thickness of 20cm). Sowing methods include sowing, sowing and sowing. Two new methods for the promotion is the use of wet spraying and spraying technology. 2., turf: applicable to the need for rapid greening of the soil slope. Turf laying form tiled, laminated type, form