We offer a comprehensive service. Traditional Excavation Severely damaged pipes are replaced with new ones constructed to comply with building regulations, codes of practice and the requirements of local authorities. Building regulations now stipulate that rigid pipelines are made more flexible. It is also a requirement that pipelines from structures are flexibly jointed to allow for settlement, expansion and contraction. Only British Standard-approved pipes and fittings are used to replace existing materials. The process of replacement involves the excavation and disturbance of ground surfaces, which vary from one place to the next. Care and attention is given to restore the surface to its former or improved appearance, which is especially important where hard and soft landscaping is required. In-situ Lining For over 20 years, Cured in Place Pipe (CIPP) in-situ lining has dominated the non-man-entry sewer renovation market in many countries. Several competitive systems are available, all sharing a common feature: the use of a fabric tube impregnated with polyester or epoxy resins. This is inserted into the existing sewer, then inflated and cured at ambient temperature or by circulating hot water or steam (a process common in all but the smallest diameters). Although there's a slight loss in pipe reduction, the cured in situ liner advantageously conforms to almost any shape, making it suitable for re-lining noncross sections. Lining improves structural and hydraulic performance while reducing repair costs. Due to the low capital cost of equipment, ambient-cured lining systems have become popular with many contractors as an alternative to carrying out drainage repair by excavation. Resin grout injection Resin injection systems may he used to stabilise and re-bond the existing pipe structure to seal against exfiltration and infiltration. Some techniques are aimed at pipes where damage is not severe or extensive, while others are more suitable for serious defects. High-performance polyurethane grout is injected from within the existing structure to seal it. These grouts mix with water, reacting to form an impermeable elastic barrier against further exfiltration and infiltration. The mixtures follow water paths as they penetrate and seal cracks, fissures and voids and transform the surrounding ground into an impermeable mass. The grout's good adhesive properties create a bond with the existing structure while maintaining flexibility. Trial Holes and Soil Investigation It's important to investigate the soil when trying to identify structural building damage and subsidence. We work closely with consulting structural engineers and others requiring this service, providing the equipment and expertise to collect factual technical evidence, as required.

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