Application of Mortar Pump in Grouting Technology of Geotechnical Engineering
Mortar pump in geotechnical grouting technology for pressure below 6MPa hydrostatic grouting, grouting operations can be summarized into four categories:
1, filling or fissure grouting
Large caves, tectonic faults, tunnel lining wall after grouting. Rock-soil level, joint and fault seepage, consolidation grouting.
2, penetration grouting
Without destroying the arrangement of the formation particles, the slurry fills the interstices of the particles, cementing the particles into a unitary body. The necessary conditions for osmosis grouting are that the particle size of the slurry is much smaller than the particle size.
3, compaction grouting
Compaction grouting is injected into the thick slurry, the formation of spherical or cylindrical slurry, the soil around the compacting, the soil plastic deformation, but does not produce soil splitting damage.
4, split grouting
Split grouting is the slurry in the hole with grouting pressure increases, the first pressure around the soil when the pressure reaches a certain extent, the flow of the formation of the formation of fracturing strata, the formation of vein-like or strip-like cement. Mainly used for soil consolidation, fractured rock seepage enhancement.
Equipment installation and configuration
Grouting methods are pure pressure grouting and circulating grouting two. General soil grouting large amount of suction slurry, the use of pure pressure grouting; fractured rock mass suction small, the use of circulating grouting.
According to the grouting material, it can be divided into single grouting and double grouting. Two-fluid gel time is longer, both in the tank after mixing with a single pump injection, known as single gun injection. Gel time is medium (2 ~ 5min), double-liquid pump in the hole after the injection of mixed, known as the injection of 1.5 guns; gel time is short, the double pump with double pump into the bottom of the hole after the injection, said For two guns injection.
Single shot grouting and double grouting in the injection of a single shot with a mortar pump (hereinafter referred to as single-pump grouting), two-shot grouting injection 1.5 shots and two shots are required two mortar pump (hereinafter referred to as Double pump grouting). The actual construction of the soil and grouting materials according to different installation and configuration of equipment, there are four possible grouting combination configuration, namely: single-pump pure pressure grouting, single-pump circulating grouting, double-pump pure pressure injection Pulp, double pump circulating grouting.
After grouting, the equipment must be cleaned immediately to prevent the equipment from condensing in the equipment. Mortar pump flow through the - valve adjustment to meet the slurry ratio design requirements.
Dam, mine tunnels, shafts, tunnels, river tunnels, subways and other underground engineering excavation grouting anti-seepage curtain; can control water or seepage control plugging. Seepage control of dam body and dam foundation, water seepage around foundation pit and foundation gushing water can all be treated by grouting method.
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