Pressure Grouting

Small volume placement of cementitious and resin based grouts in difficult situations.

• Infilling of spaces under machine bases, annular gaps around pipe inserts, voids in steel fabrications.
• Injection of cement based grouts into or around masonry structures to strengthen cavity or rubble wall construction, stabilise loose fill, prevent movement and improve structural integrity.
• Use of small to moderate volumes of foamed concrete or grout to fill redundant drains, sewers and manholes or to fill voids beneath redundant bridges or subways.
• Prevention of ground water ingress into precast segmental concrete manholes, shafts, culverts and tunnels
• Remedial work to make good the effects of washout and other disturbance caused by ground water in masonry bridges, culverts, tunnels, shafts, basements, man holes 
• Grout materials used are conventionally pre-bagged, cement or cement:pfa mixes, mixed mechanically and delivered to the point of application using mechanical worm pumps
• Special formulations are available, for example to resist washout when grouting voids with high water flows, or to suit heritage requirements, where a lime based material may be specified.

INFORMATION

Use of non-cementitious grouts is used in more demanding situations where, for example...

• leakage of water is a problem, requiring techniques such as interstitial grouting of brickwork and masonry walls, bridge arches, culverts and tunnels using aqua- reactive polyurethane resin grouts
• high strength repair may call for the use of epoxy resin based grout
• heritage situations suggest use of more traditional lime based grout formulations 

Examples of Past Work

Injection of lime based grout to stabilise very poor masonry as part of retaining wall refurbishment for Somerset CC - more details.

Grouting beneath undersized pump bases at waste water treatment works.

Strengthening of masonry culvert arches for Lancashire County Council

Stabilising river side retaining walls using purpose made grout bags to prevent pollution of watercourses for clients such as the Environment Agency.