Re-instating a tank with major structural problems Re-instating a tank with major structural problems

Re-instating a tank with major structural problems

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Relining to water tower

11 February 2016

CSC Services were able to reinstate a water tank that had been rendered out of action through the effects of carbonation. The tank had lost over an inch of concrete.

The use of Sika gunite 133 to coat the tower was specified for this repair work as it allowed a high build in one application, had a quick set time and was cost effective. As experienced contractors to the water and power industry CSC Services would always work with a client to identify the optimum coating to be used.

The repair work demonstrates how investing in specialist repair services and the correct coatings can significantly extend the life of any asset.

The repair process explained

An external hoist was constructed to the water tower as access for staff and materials was through the roof. Hydro-demolition was used to remove failed bitumen tank lining and to prepare the surface for a gunite 30mm spray applied covering. Steel mesh was fixed to the substrate and wooden battons used to form expansion joints.

Walls were sprayed with gunite dry sprayed fibre reinforced micro repair concrete.

The wooden battons were removed. Joints were filled. Thoro-flex over-banding was applied to form sealed expansion joints.

The floor was sealed with two coats of SikaTop 107 cementitious coatings.

Coatings were left to cure and once cleaned the tank was returned to service.

The following images show the job as completed in stages:

External hoist constructed to access water tower

An external hoist was constructed as access for staff and materials was through the roof.

Access hatch into water tower

This image shows the access hatch.

Steel mesh fixed to substrate on water tower wall


Following Hydro-demolition to remove the failed bitumen tank lining and to prepare the surface for a gunite 30mm spray applied covering, steel mesh was fixed to the substrate.

Wooden battons used to form expansion joints


Wooden battons used to form expansion joints.

Water tower walls sprayed with gunite dry sprayed fibre reinforced micro repair concrete

Walls were sprayed with gunite dry sprayed fibre reinforced micro repair concrete.

Thoro-flex over-banding applied to form sealed expansion joint


The wooden battons were removed. Joints were filled. Thoro-flex overbanding was applied to form sealed expansion joints.

Floor sealed with sika cementitious coating

 

The floor was sealed with two coats of Sika Top 107 cementitious coatings.

For more information about CSC Services please e-mail: enquiries@csc-services.co.uk