Unit - Petraflex concrete units are manufactured with tapered sides, and a notch and key unit interlock system. The units come in different width and height variations to match site engineering requirements. The units are made with high strength precision molded concrete. Perpendicular cable ducts run through the unit permitting cable to be threaded through.
Mattress - Petraflex mats are pre-assembled to the size specified for the project. Polyester cable is threaded two ways through the units to form the mat. Once assembled, the mats are stockpiled or transported by flatbed trucks or barges to the job site.
Mattress Connection - Lateral cables between adjacent mattresses connect by crimping an aluminum sleeve over both cables. The sleeves have a breaking strength greater than the polyester cable. Polyester cables used in brackish water applications for over a decade have shown a strength loss of less than 2%.
Spreader Bar with remote release
Curves or bends - Channel or shoreline curves and bends are areas of high energy. The connection integrity of angle mattresses and adjacent mattresses at these locations is critical to the performance of any revetment system. Angle mattresses are connected to adjacent mattresses with crimped aluminum sleeves in the same fashion as a typical rectangle mattress, thus ensuring continuity throughout the entire system.
Slope angle - The maximum allowable slope angle for the Petraflex mats is 2H: IV Generally, slopes with an angle of 3H:IV or milder will require minimal anchorage unless extremely poor soil conditions exist. Mats placed on slope angles between 2H:IV to 3H:IV require analysis for slope stability.
Underwater - Petraflex mats can be efficiently placed below waterline. Spreader bars are fitted with remote release devices to facilitate underwater placement. This eliminates the need for dewatering the site for construction.
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