“Anchors are tractive structural elements capable of transmitting forces to the ground thanks to an armature made of bars and steel strands made solid with the ground by means of an anchor bulb.
They are used to stabilize rocky walls to anchoring bulkheads or support walls.
The function of the anchor rods is therefore to transfer the necessary constraints to the work static in areas where the ground offers the ability to absorb the stresses in play.
Anchoring to the soil is carried out by cement mixes that can be injected with systems that diversify according to the type of soil.
O.S.G. is able to perform both active and passive seams as well as passive ones thanks to their own baggage experience”
Deep mixing
Soil Mixing is a consolidation method that involves inserting into the ground a rotating tool on which propellers are connected to ensure that the soil is disintegrated and rewound with the binder inserted by means of special nozzles. This is how to form an element (column, septum, etc.) of material that exhibits better resistance, deformability and permeability characteristics of the surrounding soil. The mainly used binders are cement or lime.
Plastic diaphragms
The traditional plastic diaphragms consist of the realization of a vertical burrowing bucket bucket followed by filling with a water – cement – bentonite blend. In the case of reclamation works where it is absolutely necessary to prevent the dispersion in the surrounding soil or in the water of elements of particular danger to the environment and health it is guaranteed the impermeability of the barrier by inserting into the blend newly thrown by HDPE panels
Plastic diaphragms with CSM technology
CSM (Cutter Soil Mixing) technology consists in the creation of a waterproof plastic barrier made up of a series of interlaced panels obtained by mixing the in situ soil with a mixture of water, cement and bentonite (CSM method). This processing is generally remediation interventions that consist in the realization of a barrier to the fence aimed at the interruption of the migration of the pollutants it carried. Particularly used as a preconsolidation work of excavations.
Cement and chemical injections
Used to improve the mechanical properties of the soil as well as to drastically reduce permeability. Injected at controlled pressures and volumes depending on the volumes of gaps actually available and injected, and the granulometry and permeability of the different layers involved in the treatment.
Jet Grouting
Column consolidations obtained by disintegrating the soil mixing it simultaneously with a cementitious suspension through nozzles of various diameters and with pressures up to 600 bar. There are three different methodologies that differ essentially from the number of fluids adopted: Single-fluid Jetting: the same blend (boiacca) is used both for disintegrating action and for stabilizing action; Double-fluid Jetting: the disgregating action of the boiacca is accompanied by a Compressed air jet in order to favor the “infiltration” of the fluid into the ground. Three-fluid Jetting: provides a fluid for the disintegrating action and a fluid for stabilizing action. The disaggregating action is achieved by high speed water jet with or without compressed air. The stabilizing action is entrusted to boiacca pressure jet.
Jet Grouting Walls and waterproof swabs
Consolidated ground columns used for a perimeter digging of the excavations (possibly reinforced with steel tubes) and for the creation of a waterproof swab designed to counter the hydraulic substructure, allowing the excavations and the subsequent construction of the reinforced concrete slab in the absence of water. The blend used can be both boiacca (water and cement) and a ternary plastic mixture (water – cement – bentonite) according to a mixture of components designed to achieve the degree of permeability to be achieved.
Drainages sub-horizzontal
Sub-horizzontal drains are circular section drains of small diameter inserted into the body of a sloping slope or in the face of an excavation during its execution in order to eliminate excess water. They consist of perforated tubes (possibly coated with TNT socks) which are installed on holes made with propeller drills or with rotating equipment equipped with suitable excavating tools
Forepolings
By the term termination are all the technologies used to support the land in advance of excavations. Geometry is usually truncated, so it can partially overlap with the previous series. Horizontal or sub-horizontal perforations are performed by a “positioner” and subsequently armed with metal tubes or VTR cemented to the surrounding ground.
Jet Grouting Sub-horizzontal
Sub-horizontal consolidated columns to consolidate the advancing faces or the contour of the natural tunnels to be constructed to allow subsequent excavation in the traditional. In order to avoid overpressures that would cause lifting of the above ground and artifacts, a steel liner can be used which is left in operation as a final reinforcement at the end of the treatment. This effectively controls the bleeding material flowing into the annular space between the drilling rods and the coating.