Lowestoft Flood Alleviation is a scheme aimed to alleviate the risk of flooding at several locations in Lowestoft, Suffolk. 

Anglian Water laid new 300mm diameter pipes along various locations in Lowestoft but had a past history of external flooding. The program was designed to reduce a re-occurrence of the flooding experienced in the past when the sewage system is overwhelmed.

The 300mm pipes had to be jacked through Lowestoft sand from the thrust pit to the reception pit.  Due to the high water content of the surrounding Lowestoft sand it was necessary to prevent water and sand ingress once the eye opening in the pit had been formed. Due to poor ground it was also necessary to provide a reaction behind the thrust wall against which to jack.

TAM was contacted by Barhale, the Main Contractor undertaking the works.

A suitable and cost effective solution had to be designed to provide a watertight seal behind the eye location and to consolidate and improve bearing capacity behind the thrust wall. After analysing soil type data and discussing the project in depth with the Contractor and Engineer, a method was drawn up utilizing a combined grout injection method.

The proposal for the eye section involved the use of TamPur 110 - low viscosity single component polyurethane - in combination with our TamAcryl 2000 acrylic. Injection lances were positioned around the eye in a fan style and TamPur 110 introduced in stages drawing back from 2.5 metres to the pit outer face.

This operation continued until the sand had been fully consolidated around the eye circumference. TamAcryl was then systematically injected into the eye centre to form a consolidated and waterproof mass. The sand behind the thrust wall was then consolidated using the TamPur 110.

TAM’s contribution

1. Expertise and knowledge of varying ground conditions and ground injection technique
2. A wide selection of technically advanced materials
3. Problem diagnostic and consulting input
4. A range of application techniques to achieve successful results