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Trench & Access Covers

Lightweight Fibreglass Vehicular & Pedestrian Trench Covers

Dura Slab GRP Covers are a lightweight alternative to pre-cast concrete trenching systems

Dura Composites offers a range of strong, durable and lightweight Glass Reinforced Plastic (GRP) Trench and Gully Covers known as Dura Slab Trench Covers. Dura Slab GRP Trench Covers have low life cycle costs and require virtually no maintenance over their long lifespan. They can be fitted with built-in lifting eyes, so they are light and easy to deploy, without compromising on strength and safety.

Thanks to our in-house design and fabrication capabilities, Dura Composites can tailor your GRP trench covers to suit any trenching layout – saving you valuable time and money on site. No specialist lifting equipment is required to manoeuvre Dura Slab GRP covers into place – only a 1 or 2 man lift is required, and the covers feature a gritted anti-slip surface for maximum safety.

Dura Slab is ideal for new constructions and replacements for old covers, but is also well suited for refurbishment applications to replace old, heavy & cumbersome traditional gully or duct covers, such as those made from concrete which are prone to cracking. Dura Slab’s GRP characteristics make it more favourable for these applications over using steel, timber or concrete systems, due to its lower weight, anti-slip surface, ease of installation and absence of maintenance.

Dura Slab is Suitable for High Strength Applications and Has Been Tested to B.S. EN124

This European standard applies to duct covers and manhole tops for vehicular and pedestrian areas. In order to reach this approval a Dura Slab duct cover panel of 74mm thickness and 1280mm span was subjected to a load equivalent to two thirds of the Class B test load, 83.3kN, and then reduced to zero.

The high glass-to-resin ratio of Dura Slab flooring provides superior strength and load-bearing characteristics. With structural integrity protected by its unique corrosion resistance capabilities, fibreglass lasts longer than traditional materials. The panels will not corrode even when exposed to continuous submersion, splash, spills, fumes or gases.

Dura Slab is available in various resin systems, two of which meet the Class 1 flame spread rating of 25 or less, in accordance with ASTM E-84 Tunnel Test Method and to British Standard Part 7 Class 1. classification.

Dura Slab GRP Trench & Access Covers Allow for Deflection

Dura Slab design procedures are entirely different from those associated with traditional materials. The prime consideration in designing with fibreglass is allowable ‘deflection’ as opposed to ultimate ‘loading’ used with steel. The inherent elasticity of reinforced plastic, permits far greater deflection than steel, without the danger of structural failure or permanent deformation.

Dura Slab Fibreglass Covers Product Range

Dura Slab – Type 40 Light

Quick Description: P40A 500 Open T&G
Full Description: Pultruded 40, Class A, 500 Wide, Open Bottom, Tongue & Groove
Maximum Span (BS EN 124): A15 – 2m

Dura Slab – Type 45

Quick Description: P45A 700 Closed Lap Join
Full Description: Pultruded 45, Class A, 725/675 Wide Top, Closed Bottom, Lap Join
Maximum Span (BS EN 124): A15 – 2m

Dura Slab – Type 50 Light

Quick Description: P50A 500 Open T&G
Full Description: Pultruded 50, Class A, 500 Wide, Open Bottom, Tongue & Groove
Maximum Span (BS EN 124): A15 – 2m

Dura Slab – Type 50

Quick Description: P50B 475 Closed Lap Join
Full Description: Pultruded 50, Class B, 500/450 Wide, Closed Bottom, Lap Join
Maximum Span (BS EN 124): A15 – 2m | B125 – 1.2m

Dura Slab – Type 75

Quick Description: In Development (Available During 2018)
Full Description: Pultruded 75, Closed Bottom, Lap Join
Maximum Span (BS EN 124): TBC

Dura Slab – Type 100

Quick Description: P100D 600 Closed Lap Join
Full Description: Pultruded 100, Class D, 650/550 Wide, Closed Bottom, Lap Join
Maximum Span (BS EN 124): A15 – 5m | B125 – 3m | C250 – 2m | D400 – 0.6m

Joining Methods

Half Lap Joint

This illustration shows how the half lap trench covers join together allowing for easy removal for maintenance access. Dura Slab Panels featuring a lap joint have a rigid construction which rem,oves the panel deflection at the edge and improves overall panel service life. Every other panel is easily removable for access.

Tongue and Groove (T&G)

This illustration shows how Dura Slab panels which feature a Tongue and Groove (T&G) join fit together. The T&G join ensures each connection is rigid and removes panel deflection at the edge. Panel removal is not possible unless specially fabricated on request.

Dura Slab Fixings and Accessories

We have a wide range of fixings and accessories available to cater for a multitude of applications for our trench cover and structural slab products.. Our technically trained sales staff can advise you on the best fixings for your project. Some examples are shown below:

Shallow Recessed Collar

This is aflush surface clip which directly fixes to the substrate. It is suitable for regular duty use such as pedestrian traffic and is M8 head compatible.

Deep Recessed Collar

This is a flush surface clip which directly fixes to the substrate. It is suitable for heavy duty use in areas of vehicular traffic for example, and is M12 head compatible.

Dome Headed Washers/Clips

Available in both large and small sizes these are a cost effective heavy duty fixing clip which fixes direct to the substrate. The domed shape reduces trip hazards, and the countersunk head or Captive Nut is compatible with M8 (Large) and M6 – (Small)

Lifting Eyes & Keys

Dura Composites’ Lifting Keys enable manual lifting of panels for easy access to trenches and recesses underneath. The eyes are fabricated into accessible positions to suit each application and the dimensions of the T-Bar lifting keys. Two lifting eyes are required on each panel as standard, but this is dependent on panel length and weight.

Dura Slab Fibreglass Covers Product Range - Moulded

Dura Composites Moulded Trench Cover 19

Quick Description: M19A 1000 Closed Flush
Full Description: Moulded 19, Class A, 1000 Wide, Closed Bottom, Flush Join
Maximum Span (BS EN 124): A15 – 0.4m

Dura Composites Moulded Trench Cover 30

Quick Description: M30A 1000 Open Flush
Full Description: Moulded 30, Class A, 1000 Wide, Open Bottom, Flush Join
Maximum Span (BS EN 124): A15 – 1.25m

Dura Composites Moulded Trench Cover 30

Quick Description: M30A 1000 Closed Flush
Full Description: Moulded 30, Class A, 1000 Wide, Closed Bottom, Flush Join
Maximum Span (BS EN 124): A15 – 1.5m

Dura Composites Moulded Trench Cover 43

Quick Description: M43A 1000 Open Flush
Full Description: Moulded 43, Class A, 1000 Wide, Open Bottom, Flush Join
Maximum Span (BS EN 124): A15 – 2.1m

Dura Composites Moulded Trench Cover 55

Quick Description: M55A 1000 Open Flush
Full Description: Moulded 55, Class A, 1000 Wide, Open Bottom, Flush Join
Maximum Span (BS EN 124): A15 – 2.7m

Dura Composites Moulded Trench Cover 50

Quick Description: M50B 1000 Closed Flush
Full Description: Moulded 50, Class B, 1000 Wide, Closed Bottom, Flush Join
Maximum Span (BS EN 124): A15 – 3m | B125 – 0.6m

Dura Composites Moulded Trench Cover 75

Quick Description: M75B 1000 Closed Flush
Full Description: Moulded 75, Class B, 1000 Wide, Closed Bottom, Flush Join
Maximum Span (BS EN 124): A15 – 4m | B125 – 1.5m

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