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The Vertform concrete formwork system was developed by Ant Hire as an alternative to traditional construction methods for creating manhole bases and inverts in a range of sizes
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Manhole Construction: A Reusable GRP Invert
Shuttering System
Learning Aims and Objectives
• Methods of manhole construction and the challenges faced when
constructing manholes
• How to use an invert shuttering system and its results • When can an invert shuttering system be used.
To introduce a reliable method for creating
stable, watertight manhole bases with the
required profile.
What problems are faced when
constructing manholes?
Understanding different methods of
manhole construction
Rough Forming
• Base created manually with a
shovel using semi-dry
concrete
• Finished with a layer of
smooth concrete
Rough Shuttering
• Plywood and timber boats are
used to create a channel in the
manhole base
• Finished by hand
Half Pipe Segments
• Segments set in semi-dry concrete to form the base
• Finished by hand
Bespoke Timber Formwork
• Made to suit each individual
structure
• Can accommodate additions such
as sumps and hydro-break
systems
• Made to create watertight manhole inverts
and bases in a single operation
• Eliminates the need for concrete remedial
work
• No hand finishing required
• Correct profile can be created consistently
• Reusable
How To Use The Vertform
Shuttering System
• Base components are selected to form the required angle
• Any angle between 90 degrees and 180 degrees can be accommodated
• The side components are attached to the base, and the
Verform is secured in place using jacks
• Once complete, the entire shutter is sprayed with releasing
agent and vibrated concrete is poured around the mould
• Once set, the Vertform can be easily removed
Vertform Applications
Pipe Diameter Changes
T Connections
Extra Long Channels
Landing Bays
Single End Fixing
Side Connections
Rebate for Double Step Irons
Summary - Learning Outcomes
• An understanding of manhole construction
• An understanding of how the different methods compare
• An understanding of how to use the Vertform system
Ant Hire Solutions www.anthire.co.uk 0845 125 9595
Manhole construction using an Invert Shuttering System