Truckcell® Porous Grassed Surface

Structural design, installation and maintenance guidance

Truckcell is a recycled plastic cellular porous paving solution for use in Sustainable Drainage Systems (SuDS). Truckcell is suitable for a wide range of trafficked applications where a stabilised, free-draining grass surface is required and where high vehicle loads are expected. Typical applications include: coach and truck parks, emergency access, and maintenance routes. Considerations relating to the movement and attenuation of water within the porous pavement are not covered in this document. This document is intended to be a summary presenting typical solutions. Contact ABG for detailed site specific advice.

TRUCKCELL® INSTALLATION PROCESS

The following generic guidance must be read in conjunction with the specific project specification within the contract documents and the design notes below.

ABG Truckcell grassed surface design and installation guidance

1. Install the specified lower ABG Terrex NW9 filter/separator geotextile and sub-base stabilisation onto the prepared subgrade formation.

2. Install the specified sub-base and edge restraints.

3. Install the upper filter/separator geotextile on top of the sub-base.

4. Install the specified bedding layer to a uniform thickness.

5. Ensure an accurate right-angled Truckcell™ laying pattern bysetting-out the site using string-lines. Check the lines regularly for accuracy. Start installing the Truckcell™ blocks. Wherever possible start laying from a right angled corner and progress across the site in rows. The blocks can be installed in a width or lengthwise orientation and cross-bonded if required or appropriate to fit the site. When installing the interlocking type blocks (80mm thick) ensure that the male/female connectors are fully located together. Use protective gloves to avoid abrasions.

6. Truckcell™ Pavers can be cut to fit around obstructions & curves using a hand or power saw. Wherever possible avoid using small cut-pieces less than one-third original size.

7. When installed, fill the paver cells loosely to the finished level (top of cells) with the specified cell infill. Remove excess soil from the surface of the pavers and do not overfill. A single pass with a light vibrating plate machine or roller may be used to firmly bed the pavers and settle the soil, but do not compact the soil. Do not vibro-roll. It is preferable that the soil is left just below the top of the cells to aid quality grass growth and reduce traffic abrasion. The surface may be trafficked by slow moving plant during the cell filling process, but care must be taken not to displace the opencelled grids.

8. Apply the grass seed at the supplier’s recommended rates.

9. The surface may be trafficked immediately after the cells are filled However, it is strongly advised that the grass is allowed to establish fully, then mown 2 or 3 times, prior to regular use.

10. A routine management and maintenance programme to keep thesurface in good condition and free of debris and weed growth, will help to sustain the porosity, quality and longevity of the system.

Design Notes

Note A.

Advice on subgrade CBR% strengths, ground conditions, and construction over weak ground is available from ABG.

Note B.

Alternative ABG stabilisation geosynthetics may be used in lieu of ABG Abgrid geogrid. These include ABG Gridtex Type 2 high strength woven geotextile or ABG Abweb geocells. If the sub-base stabilisation is omitted, the total sub-base layer thickness (‘D’ on Table 1) is typically increased by a minimum of 50%.

Note C.

A permeable open-graded (reduced-fines) aggregate is recommended, such as DTp Type 3 low-fines roading aggregate, or BS 7533-13:2009 SuDS aggregate (4/20 or 4/40). However, where a conventional DTp Type 1 sub-base is to be used, it is essential that a drainage system such as ABG Fildrain is incorporated. Specific advice is available from ABG.

Note D.

Maximum sub-base particle size should match minimum sub-base thickness but must not exceed 75mm diameter. For sub-base thicknesses of around 100mm, a minimum 37.5mm particle size should be adopted to allow effective installation of the Abgrid.

Note E.

Typical paving edge restraint solutions include: concrete, timber, railway sleepers, steel and heavy-duty plastic.

Note F.

The sub-base must be overlaid by a Terrex NW9 geotextile to provide separation, enhanced water treatment function and prevent migration of the bedding layer.

Note G.

To provide a stable bedding layer for Truckcell, the bedding layer must not be sand.

Note H.

The paver fill material should suitable for healthy grass growth. Amenity grass seed mixture should contain hard wearing, low fertility and/or drought tolerant species with a low percentage of clover content if acceptable.

Note I.

The maximum advised gradient for vehicular trafficked applications is 8% (1:12) 5°.

Note J.

When designed in accordance with the recommendations, Sudspave complies with BS8300:2009 : “Design of buildings and their approaches to meet the needs of disabled peopled” – Code of Practice (ISBN 9780 580 57419) & Building Regulations Document ‘M’ Section 6.

Note K.

All stated dimensions & weights are nominal and in accordance with manufacturing +/- tolerances.

Note L.

The recommendations in this document are only suitable for use with ABG products.

Table 1: Truckcell® typical DTp Type 3 sub-base thickness (D) requirements – refer to specific construction drawing

Vehicle Load & Frequency
CBR (%) strength of subgrade soil (Table 2)(D) DTp sub-base thickness (D, mm)Abgrid Geogrid
Light vehicles with emergency HGV access6+100
20/20

=4-610020/20

=2-412030/30

=1-222030/30
Light vehicles with one HGV per week
6+12520/20

=4-6150
20/20

=2-4200
30/30

=1-232530/30
Light vehicles with 10 HGV's per week6+165
20/20

=4-6200
20/20

=2-427530/30

=1-242530/30
Regular HGV access
6+20020/20

=4-625020/20

=2-4350
30/30

=1-2500
30/30




Table 2: Field guidance for estimating sub-grade shear strengths

CBR (%)
DCP Result 1 (Sandy Soils)
HSV Result 1 (Clayey Soils)
Tactile (Clayey Soils)
Visual (Clayey or Sand Soils)
1<1<30 kPa
Easily indented by fingersAdult standing will sink >30mm
1-2
<1
30-60 kPaIndented by strong finger/thumb pressureAdult standing sinks 10-30mm
2-4
1-2
60-120 kPa
Cannot be indented by thumb pressureUtility truck ruts 10-25mm
5-7
2-3120-200 kPa
Can be indented by thumb pressureLoaded construction vehicle ruts by 25mm
>8
>3>200 kPa
Difficult to indent by thumb nailLoaded construction vehicle ruts by <10mm

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All information is supplied in good faith and without charge to enable reasonable assessment of the practical performance of ABG products. Final determination of the suitability of information or material for the use contemplated and the manner of the use is the sole responsibility of the user. As design and installation is beyond the control of ABG (unless specifically requested) no warranty is given or implied and the information does not form part of any contract. ABG reserve the right to update the information within at any time without prior notice. ©2017 ABG Ltd

 

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