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Compaction Grouting

A soil correction pressure system to increase the bearing capacity of soils. The compaction application is accomplished by pumping a thick cement grout, under intense pressure, into a particularized location of ground to compact its surrounding areas of soil. The expanding grout pushes the uncompacted soil to the side as it forms a concrete column, sized as needed. Sometimes this compaction method is also known as pressure grouting.

Displacement of the soil is produced by the overburden pressure pushing back against all sides of the compaction grout column. A major advantage of using compaction grouting is that its top peak effect is realized in the weakest or softest strata of the soils underlying a building.

The system uses include pre-construction preparation of soils, lifting structure approaches, re-leveling roads, bridges, towers, existing damaged structures, blocking flow-path of viscous liquids through stratum layers, filling rock cracks (microfine cement), voids, and hairline fractures, construction of underpinning, densifying footing soils, and remediation of dangerous sinkholes. This pressure grout technique is mostly used to increase the substructure soil density.

Usually, grout (cement) is applied in measured stages beginning at the lowest point of a drilled shaft then working upward through the weak ground. On very shallow injection applications, compaction grout can be injected from top down, building a cap. This method densifies the upper portions of treated area first so that it becomes a dense cap to help the containment of the expanding grout at lower stratum levels. When applied in a grid style layout, the pressure treated soil underneath the foundation has a greater uniformity throughout its entire mass, which gives maximum soil stabilization that provides solid foundation support
 

Compaction Grouting Pressure Slurry Microfine Cement Pressurized Sealing Ureathane Sealing Soil Nailing Cement filled Piles - Rembco Geotechnical Contractors Incorporated


Foundation Lifting Sequence


Provides foundation support consisting of pressure filled concrete piles,
used either as end bearing or skin friction bases for lifting or stabilizing foundations.

1. The first step in compaction grout piles construction is coring through existing footing extensions.

2. An iron casing is driven through the hole footer protrusion hole down to bedrock or proper friction depth.

3. A thick, mortar-like cementitious mixture (grout), less than two inch (2”) slump having more than 3,000 psi compressive strength, is steadily pumped at pressures up to 1,000 psi contained within the steel casing to form a uniform cohesive concrete bulb.

4. The bulb is expanded to one-foot diameter by displacement of soil at lower tip of casing, while a calculated and measured volume of compaction grout is steadily maintained.

5. The pressure grouting tube is raised one foot, and the pressurized process repeated.

6. Pressure injections continue as casing is withdrawn up to the structure's cement footing, which creates an in-place solidified grout pile surrounded by intensely compacted soil.

7. Threaded bar (75 ksi) is inserted into compaction grouting opening and then sealed over using a similar cement material.              


 

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