Grouting reinforcement, the correct construction method and technology

Overview: grouting reinforcement is one of the grouting method, often used for construction of grouting reinforcement, repair and waterproof plugging. Reinforcing grouting is inject grout injection by drilling hole, surrounding rock by grouting pressure will crack spread of surrounding rock, thus forming rock mass reinforced belt, namely the grouting curtain, thus improve the integrity of the rock mass and enhance the strength of surrounding rock of technology. The strength of surrounding rock. The reinforcement grouting construction technology is simple, easy to operate, low cost, good reinforcement effect. But felt or consolidation of various types of loose circle and fracture zone. This is an effective way to keep the loose surrounding rock of roadway. Grouting reinforcement are suitable for all kinds of damage form of roadway, especially applicable to the damage of surrounding rock of roadway, the effect is more apparent. The technology not only can be used to maintain the damaged roadway, and can be used for new dig tunnel grouting reinforcement. The main technical principle of grouting reinforcement is used in the seal, seal, under the penetration drilling method, etc. First of all, for weak section of seal, seal osteoporosis fracture, forcing the curtain and slurry leakage. Upper seal, that is, the lower part of the weak layer in the upper portion of the paragraphs drilling, formation of consolidation ring, sealing slurry act along the outside of the channel, forcing the serous levels or downward diffusion. Down after the seal, seal up, grouting reinforcement is carried out on the key parts of the grout injection in the weak layer infiltration, diffusion, consolidation, formation of compression. Methods application scope: 1, 2, subsidence of foundation reinforcement concrete building waterproof 3, structure crack repair and plugging construction process: a, applied in subgrade construction technology of grouting reinforcement subgrade soil compaction and consolidation grouting reinforcement mechanism can improve the bearing capacity of subgrade, reducing settlement. Slurry split replacement can improve the strength of soil structure, eliminate the geological defects. Gap (poa pratensis), gap filling subgrade cracks, jam hydraulic scour channels or pipes. Cataclastic structure of cementation structure can improve the pavement base, to enhance the overall strength of the pavement base. The project adopts the static pressure grouting roadbed grouting reinforcement construction design method. Static pressure grouting method is according to the principle of hydraulic pressure, air pressure, electrochemical and form. Grouting pipe will be strong consolidation grouting injection formation. Injection grout filling, permeability, compaction and splitting, extrusion of soil particles or the rock fracture water and air, its position, and injection slurry consolidation. Later, the original loose soil particles or cracks were consolidated into a whole, which changes the physical and mechanical properties of rock and soil. The superiority of static pressure grouting method optimum roadbed grouting reinforcement method curing agent ( Paste) Along the weak subgrade infiltration filling and compaction and consolidation, replacement, cement solidification, elimination of geological defects, improve the roadbed mechanics performance, improve the bearing capacity, reducing uneven settlement. 1, fundamentally eliminate the roadbed uneven deformation, fundamentally the prevention and treatment of diseases. 2, high economic benefit. 3, short construction period, less pollution, civilization construction. 4, advanced technology, mature construction method, the result is reliable. Osmotic grouting slurry out free water and gas in the soil, filling cracks or voids, binding the surrounding soil, forming dense solidified body, so as to improve the compressive strength and impermeability of the soil. The change of soil infiltration grouting can not cause the volume. Local order for sand, pebbles, gravel layer of quaternary strata ( The permeability coefficient is greater than 10 - 4cm/s） , seepage grouting method should be adopted. Fracturing grouting slurry at high pressure into low porosity formation. Under the effect of high pressure, the mud cracks along the stratigraphic structure surface, formation strata context and network distribution. Irregular vein, mesh of consolidation and compaction composite layer formed by the slurry has a certain bearing capacity and the ability to stop water. Local layers of clay, large buried depth, permeability coefficient ( Less than 10 - 5cm/s） When splitting grouting method should be adopted. Pressure grouting is used with certain consistency or acceleration of slurry can improve the physical and mechanical properties of soil, through effective stress pressure should be. Consolidated soils with spherical or commonly block distribution in the soil. Grouting hole spacing of 1. 0 ~ 2. 0 m, sand fracturing grouting pressure is zero. 2 to 0. 5 mpa, clay is 0. 2 to 0. 3MPa。 Compaction grouting using cement mortar, slump should be 25 to 75 mm, the pressure should be 1 ~ 7 mpa, slump as upper limit.