In a world where cities are crowded and space is limited, contractors are often building up or excavating and going down. With impressive large scale projects popping up everywhere, the ground needs to be stable enough to support the growing concrete jungle and this is where pressure grouting comes in.
Pressure Grouting in a Nutshell
Pressure grouting is a form of injection grouting sometimes referred to as permeation grouting or cement grouting. This process stabilises, strengthens and reduces permeability in the area it is injected. Grout can be cementitious, resinous or a solution chemical mixture and is ideal to use in awkward spaces and can avoid extensive and expensive ground excavation work. The material is injected into subterranean voids in soils or rocks and will permeate granular soils with flowable grout to therefore create a cemented mass.
What is Pressure Grouting used for?
As a barrier to groundwater flow
To fill redundant drains, manholes and sewers
To underpin and strengthen foundations
To provide excavation support
To provide soil stabilisation
To infill spaces under machine bases
To strengthen cavity or rubble walls
To ensure structural integrity and prevent movement
To infill awkward shapes e.g. gaps around pipe inserts
The process of pressure grouting is of course condition dependent since there are many scenarios pressure grouting is performed in. Sometimes the process needs to take place on an existing structure where the ground has perhaps been affected by the weather e.g. erosion, flooding, water accumulation, poor drainage and on other occasions you may pressure grout when starting from scratch on empty development space. If there are issues with ground stabilisation, always ensure a qualified pressure grouting contractor assesses this.