Welcome to CG Pipetec Ltd - Manhole Sealing

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*Welcome to the CG Pipetec Ltd website...

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With over 40 years experience working in the drainage industry, we provide a professional, honest and reliable service.

We offer competitive rates for all types of work providing high standards of workmanship. We can provide written quotations and estimates on request and we hold fixed schedule of rates for some types of work, prices can be given over the phone.

If you have any enquiries please contact us on (0845) 090 0103 or email us at This e-mail address is being protected from spam bots, you need JavaScript enabled to view it , we will be happy to answer any of your queries.

CG Pipetec - Introduction

Sewer Renovation/trenchless technology techniques are now becoming a very important part in the planning and strategy of the repair and maintenance of underground pipes, and services without and with minimum environmental disruption.

With the millions of miles of Pipelines underground in the UK, the maintenance and inspection of these pipes are a crucial part to prevent failure, such as collapsed pipes, scouring, displacement which can lead to soil displacement and severe subsidence.

The sewer renovation/trenchless technology industry has been rationalised in the Uk with the WRC Sewerage Rehabilitation manual, which has recognised across the board, procedures, grading of structural condition, and specifications for the design of structural sewer liners.

All undertakers can now plan maintenance and carry out preventative works to manage their assets more proactively and efffectively.

Nodig/Trenchless technology is a very effective, cost effective, and eliminates the environmental disruption that open excavation causes.

We are CCTV survey and maintenance specialists that can play an essential part in the strategic planning of underground assets.

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Manhole Sealing

Manhole sealing using chemical grout injection

Manhole sealing is very effective where pipelines and manholes suffers a high groundwater table giving high quantities of ground water, or sea (saline) infiltration into manholes which can increase hydraulic loadings therefore potentially causing flooding, and the overloading of pumping stations and sewage treatment works (STW's).

Chemical grout injection is very effective to seal up those leaks such as groundwater and sea (saline) infiltration by forming a waterproof barrier. Holes are drilled from within the manhole and using a pump the gel is injected into and behind the structure. When the chemical grout comes into contact with water the chemical grout catalyses creating a waterproof, flexible seal.

Application

The chemical grouts used are a hydrophilic polyurethane pre-polymer liquid for hydrophilic polymer resin type water stopping. It can be injected directly into a leaking crack, fracture, joint or can be injected 1:1 with water.

After injection has taken place the chemical grout will foam to expand and fill the void forming a tight, impermeable elastomeric seal, stopping the water flow (infiltration).

The chemical grout is :-

Solvent free, non-flammable
Has excellent adhesion to most surfaces including concrete, brick and mortar
Resistant to most organic solvents, mild acids and alkalis
Rapidly forms a highly resilient flexible seal that allows movement to the crack, fracture or joint
Reacts with sea (saline) or mineral water

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