To support our dredging and marine activities Heron Construction have a wide variety of specialist equipment such as longreach excavators, cement stabilisation plant, environmental and traditional grabs, dredge booster pumps, sand screw augers, small discharge pipeline laying barges to name a few.
Heron has a fleet of long reach excavators which are all meticulously maintained and operated by experienced long reach excavator operators. All of these long reaches can be operated from either one of Heron’s many barges or from land as per a traditional excavator. The longreach fleet includes:
1 x Hitachi ZX670-3
; 23m reach (70 tonne)
1 x Hitachi EX700-1
; 21m reach (70 tonne)
1 x Hitachi ZX330-3
; 18m reach or 21m reach (30 tonne)
2 x Hitachi EX200-5
; 15m reach and 18m reach (20 tonne)
Assembled on the deck of the spudded flat top barge Mesenge
is a Cement Stabilisation Plant or Pugmill.
The pugmill mixes dredged marine sediment with cement to form an engineered fill (Mudcrete) that is used to create reclamations, seawalls, embankments etc. The pugmill configuration consists of the following; Liebherr R944 excavator, double deck vibrating grizzly, 1000SS pugmill, 100 tonne cement storage silo, 300 kva generator and the EX 700 longreach.
To enable our backhoe dredges to remove contaminated sediment from harbours, channels and waterways Heron Construction has available four environmental dredging grabs. The advantage of these grabs compared to a normal dredging grab is that these have low turbulence when lifting the grab through the water, it has a bigger foot print and because the grab is closing almost horizontally it is possible to remove mud from the bottom very accurately.
The cutter suction dredges Kotuku and Beaver have the ability to pump material a distance of approximately 800m without the assistance of booster pumps. Heron has available three booster pumps
ranging from 450hp up to 800hp. These booster pumps can be either place directly behind the dredge and remote operated from the dredge or placed in the pipeline and manned and operated by a booster pump operator