![]() The difference is the method of which the dredge contacts the sediment. Each one can come in various sizes and ways to travel within the water (cables, walking spud, paddle wheels). Both types have power units on a barge and a pump that moves sediment via a pipeline. ![]() What is the difference in a cutterhead dredge and auger dredge?īoth cutterhead and auger dredges are types of hydraulic dredges. This hybrid method is applicable in many situations. The hydraulically powered pump is mounted on the end of the boom to pump via an attached pipeline like a dredge. ![]() The hybrid dredging method involves our excavator with a slurry pump as an attachment. The “legs” make it capable of walking over seawalls without touching them.Īnother hybrid dredging option is available as well. ![]() The second type of amphibious dredge, called a spyder, is capable of walking in 6 feet of water! It has an extendable boom and pivoting bucket for removal in hard-to-reach places. This feature allows for access to many sites. It can travel up on soft material to remove it without sinking, and even dig while floating. The RSI amphibious excavator can float in the water and walk on land. Another option RSI has developed is the use of 2 types of amphibious dredges. Barge mounted machinery must load material into a hopper barge for transport to land. Long reach excavators can reach from 50-70 feet and draglines a little further but less accurately. Mechanical dredging is quick and accurate but is often limited to reach from the shoreline or barge. Dewatering technology has improved with the use of dewatering systems or geotextile tubes but the amount of water demands some area to work within. Hydraulic dredging is very cost effective if the sediment is being placed nearby (within a few thousand feet) and there is an area large enough to dewater the slurry and return the clean water. We realize that to be efficient and effective in the market there is a demand to employ more than one type of dredging method. Both can be very practical and efficient depending on the material type, depth, and location of its destination.ĭredging contractors often try to emphasize one method or the other based on the services they offer and equipment in their inventory. The most common types are an excavator or clamshell bucket. Hydraulic dredging includes the use of a pump, usually barge mounted, to move material in a slurry via a pipeline. There are basically two approaches to dredging, mechanical and hydraulic. Mechanical dredging involves removing sediment with machinery usually with a bucket of some type. Hydraulic Dredges versus Mechanical Dredges Over the past 3 decades River Sand has built and acquired a fleet of equipment and trucks to allow us to specialize in dredging. Projects involve different approaches to limit impact and associated costs. The dredging method and equipment are never exactly the same on projects. We have multiple long-term projects and always an array of short-term projects but regardless each project has various factors. Having the right piece of equipment is key to being effective and efficient in our industry. River Sand’s toolbox is full of options for dredging. Amphibious excavators can travel and dig on land, mud, and water.Hydraulic dredge sizes are determined by the inside diameter of the discharge side of the pump.There are 2 basic methods of dredging – hydraulic dredging and mechanical dredging.This level of precise digging greatly minimizes turbidity pollution and the necessity to clean-up dig, completing depth targets faster and further reducing carbon footprint of any project. Fully automatic operation of these purpose-built buckets result in the most accurate dredging available in the world. not only allows for faster dredging, but also the ability to dredge materials not possible by clamshell rigs without pre-treating (e.g. Its combination of the largest clamshell buckets ever built in the U.S. It also possesses the ability to connect to shore-power, where available, enabling a fully electric, zero-emissions operation. The system is configured to optimize charge/discharge balance by harnessing regenerative power while lowering or decelerating the bucket, then uses power from the batteries and generators to hoist. Its system boasts a state-of-the-art hybrid power supply system utilizing a set of massive lithium-ion battery banks, allowing for usage of generators 30% smaller than those found in conventional dredges.
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