How to Install a Concrete Mat

Installation instructions for Flexible Concrete Mats and Rolls

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Guide for Installation of Flexible Concrete Mats

The importance of Anchoring and Overlapping the Flexible Concrete Erosion Mats

A Guide to design, usage, anchoring, overlapping and installation of flexible concrete mats

Please note that Australian Concrete Mats (ACM) technical drawings, illustrations, notes and anchoring details are to be used as a guide only. Every soil condition, water flow rate and project have varying parameters. ACM recommend the use and anchoring details be designed specifically by a qualified and certified engineer who is familiar with your site and project conditions.

 

Longitudinal Joins

When laying the mats side by side, it is best to make the longitudinal join go in the same direction as the water flow. This helps with preventing the water getting under the mats.
Where the concrete mat sections meet, install tightly to one another ensuring no gaps.
We also recommend placing an extra 600mm wide strip of Geogrid material under the join evenly spaced on either side.

Transverse Overlapping Joins 

On the Transverse or overlapping joins ensure the mat that is placed on top is in the direction of water flow.
The concrete mat panels should overlap each other by 450mm under the previous panel. It is recommended to dig and place the underside mat 450mm under the previous panel. Tie the overlap with a 450mm UBar Anchor or metal zip ties at 900mm increments.

Trenching in Sides

If the edge of the concrete mats is exposed to sheet flow, recess the outside 2 rows of the blocks. This will reduce the water from getting under the Concrete Mats.

In high flow water areas, place the mats into a 300mm wide x 600mm deep trench and backfill. Or dig the bottom of the mat 450mm beyond the anticipated scour point

Start Of Water Channel Mat

At the start of a water channel, trench in the leading edge 450mm or 3 blocks and backfill with non-erodible soil.
Additional anchors are recommended at every 600mm spacing to prevent the water from undermining the mats.

UBar Anchoring

UBar anchors are primarily used to help stabilize the mats in position and prevent water from getting under the mats and eroding the subsoil. They are designed to help hold the mats in place so the vegetation can grow through.
You can never have to many UBar anchors.
If required UBar anchors can be designed to be made longer than 450mm.
In area where the soil is to alluvial other anchoring technics can be used, like Earth Anchors.

Anchoring in High Flow Waterways or Alluvial Soils

In areas that have high water flow or areas that have alluvial soils, we recommend getting an engineer to design the anchoring methods. This may involve additional
• Reinforcing rods placed between the concrete shapes,
• anchored down with longer UBar anchors
• Using Hulk Earth Anchors
• Placing down lengths of steel rods and anchoring over the top

Cutting The Mats

Cutting the Geogrid material is easy. We have found a battery grinder with a blade is easiest.
A pair old industrial scissors or a sharp knife can do the same job.
You do not need to cut the concrete; you only have to cut the Geogrid Material and underlay.

Hand Placement Rods

To help manually position the mat into place we recommend using our complimentary Hand Placement Rods.
Not only do they save the bending of your back, but they also help with preventing your fingers being pinched.

Seeding and Back Filling With Top Soils

In areas that require the Flexible Concrete Mats to have grass to help anchor the mats down, we recommend seeding directly over the Bio-degradable geofabric mats. Placing 50mm of topsoil and watering in. The best tools to help spread the topsoil is the concreting aluminium rake.

Construction Notes 

  1. An Engineer must design and /or sign off on the design and onsite installation.
  2. Grade the sites so that water will not flow above, below, or around the outside of the area protected with Australian Concrete Mats. All subgrade surfaces prepared for placement of mats shall be smooth and free of all rocks, sticks, roots, other protrusions, or debris of any kind.
  3. Apply site specific seed, including native grasses directly to the prepared soil prior to Australian Concrete Mat installation.
    Australian Concrete Mat rolls are available in width of 2400mm wide. A) To achieve wider widths, install concrete mats adjacent to one another, install additional underlay geogrid under all adjoining mats. A minimum of 450mm of underlay shall extend under each side of the mat and directly against the subgrade.
    B) Install 450mm rebar U-anchors or stainless steel zip ties in 900mm increments the length of the longitudinal seam. (or as designed by an Engineer for the conditions).
  4. At the beginning of the Australian Concrete Mats, transition the initial leading edge properly with matting or sod. If exposed to concentrated flows embed 450mm vertically into the subgrade to serve as an anchor trench. The trench shall be filled and compacted with suitable fill or other (as specified by Engineer).
  5. For additional sections of mat, the mats must be overlapped. The downstream section must be underneath the upstream section by at least 450mm. Prior to installing overlap, flip upstream mat back 600mm. Excavate 60mm of soil 450mm from edge of the upstream mat. Downstream section is laid in the shallow trench, lightly spread topsoil, seed and fertilize over the initial edge. Flip end of the upstream mat over the soil covered initial leading.
  6. Install 450mm U-Anchors in 900mm increments across the overlap, install anchors directly behind blocks. U anchors consist of 12mm rebar U-anchor with 450mm legs.
  7. At the end of the armoured channel, embed the mat 450mm into a termination trench. Fill and compact termination trench with soil (determined by Engineer).

Technical Drawings for Installation of Mats

Installation of Flexible Concrete Mats

Every project site has its specific needs and requirements.

Download and refer to these technical drawings as a guide for how to install the Flexible Concrete Mat,  However, your specific project may require engineer certified and designed specifications for application of this mat for your project.

Checklist for Installation of Flexible Concrete Mats

Handy Checklist for Installation of Flexible Concrete Erosion Mats

Every project site and team has its specific differences and requirements.

Download and refer to this checklist as a guide for some suggestions for successful installation of the Flexible Concrete Mat,  However, your specific project may require engineer certified and designed specifications, and steps not noted in this document. Please create your own team checklist. for your project, this is offered a an example and guide only..

Click to download pdf of the project checklist for your installation team

Tools for Installation of Concrete Mats

A guide for which tools and equipment can be used for installation of Flexible Concrete Erosion Mats.

Gloves
Zip Ties
Hand Hooks
Hand Tools
Clevis
Portabe Concrete Cutting Saw (if cutting)
Rigging
Lifting Straps
Smooth Bucket
Excavator
Skid Skeer

Permanent erosion protection and prevention