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Soil Consolidation through Injections of Cementitious and Chemical Mixtures

The technique of consolidating soil through the use of injections of cementitious or chemical mixtures allows for the improvement of hydraulic and mechanical characteristics of soils, rocks, and structures (masonry or concrete works). From a functional standpoint, interventions for the implementation of treatments can be distinguished into:

  • Provisional purposes, to enable excavation in unstable soils or below the water table.
  • Permanent purposes, for the consolidation of foundation soils, the creation of impermeable screens or buffers, and the structural restoration of masonry or concrete structures.

Types of Injections and Intervention Phases

Types of soil consolidation injections are divided into:

  • Injections in loose soils carried out with valved tubes.
  • Injections in rock performed with an open hole..

In the case of injections in loose soils or degraded rocks, valved tubes are used and installed in the ground after drilling. The valves have rubber sleeves that, expanding under pressure, allow the mixture to exit and prevent its return. The injection is carried out by isolating individual sections with a double expansion plug.

Palingeo is responsible for drafting the project based on the characteristics of the soil and the required intervention, the type of mixture to be used, and the injection parameters to be adopted. The mixtures are packaged and pumped using injection plants. During the intervention, injection parameters, volumes, pressure, and flow are monitored and recorded to analyze the effectiveness of the treatment or the correct management of subsequent interventions.

Monitoring Technologies for Injections

Palingeo has numerous complete plants for mixing and injecting consolidating mixtures. Most plants are equipped with an automatic and computerized system for loading different mixture ingredients. Most injectors also have control and recording systems for the main injection parameters (pressure, flow, volume, valve number, etc.).

Control of the entire injection process allows for automatic adjustment of the injection treatment based on geotechnical characteristics and data collected during the operation. This ensures a high level of quality in the treatment and simplifies the management of the process.

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