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Earth Pressure Balance Machines (EPBM)
EPBMs are used for high powered pipe jacking with precise control of earth pressure via operator control of the cutterhead with pressure sensors, jacking speed, screw conveyor operation and foam and bentonite slurry additive system for conditioning of spoils. Akkerman manufactures EPBMs for installation of pipe in the 96"-168" OD range.
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Microtunneling is the best pipe jacking method for wet and unstable ground conditions or contaminated soils. Microtunneling is generally defined as remotely controlled pipejacking (personnel-entry is not required) whereby the soils at the cutter face are controlled to maintain balance. Some examples of microtunneling applications are crossings under existing utilities, busy highways, railroads, levees, waterways and sensitive wetlands or shaft-to-shaft pipeline installation. An Akkerman microtunneling system is made up of several pieces of machinery that function together, controlled by an operator who monitors and controls the tunneling operations from a console inside a control container on the surface. Akkerman manufactures MTBMs for installation of pipe in the 30" -96" OD range.
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Robbins Small Boring Units (SBU-As)
The SBU-A is a small diameter rock cutting head (from 24"/600 mm to 72"/1.8 m) that can be used with any Auger Boring Machine (ABM) to excavate hard rock on drives less than 500 ft (150 m). The Robbins SBU-A has been proven on hundreds of jobs across the U.S. Over one hundred contractors in locations around the world have proven the SBU-A works better than any other method of excavating small diameter, hard rock bores.
Robbins Motorized Small Boring Units (SBU-Ms)
If you need to bore a small diameter tunnel in hard rock where line and grade are critical, Robbins offers Motorized Small Boring Units (SBU-Ms). These machines have been specifically designed for long bores (over 500 ft/150 m) with difficult ground conditions. They are offered in cutterhead diameters from 48"/1.2 m to 78"/2.0 m. If you are not familiar with SBU-As, we suggest you read about them before researching SBU-Ms.
Robbins Rockhead (SBU-RHSS or SBU-RHDS)
If line and grade are critical and you have a longer bore (over 1000 ft/300 m in length) for your next project, you should consider the Robbins Rockhead. The diameter range is available between 54" (1.35 m) and 78" (2.0 m). The Robbins Rockhead is a powerful mid-sized tunneling machine available in both Single Shield and Double Shield models.
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Pipejacking Systems are used to hydraulically install underground pipelines within strict alignment and grade tolerances where personnel-entry (i.e. operator located inside the boring machine and/or on the haul cart) is permissible. Akkerman manufactures TBMs for installation of pipe in the 44 "-168" OD range.
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WIRTH has been involved in tunneling and mining for over 100 years, producing the largest, most powerful machines in the world. But within the last 25 years the growing demand for trenchless technology as a means for installing underground utilities, has made WIRTH develop a range of equipment to provide trenchless solutions.
At WIRTH we believe that a combination of a high installed power & superior engineering means the user is on to a winning formula. Unlike large diameter TBMs which are made project specific, microtunneling machines are modular and can be adapted to suit a variation in ground conditions and product pipe sizes. This means that a contractor having a system is able to be versatile in the work that he can compete in by either increasing the diameter of his machine, or renting the head he requires for this project. Or maybe he just needs to change the configuration of the machine for use in a harder ground formation by getting a rock head for his existing machine.
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Worldwide, more than 600 Herrenknecht Utility Tunnelling Machines (Ø < 4.20m) excavate modern supply and disposal tunnels and renovate existing systems. Whether our project engineers can help our customers to implement a project successfully largely depends how well the machinery is adapted to the prevalent geological conditions (permeability and grain distribution). It is a good job that Herrenknecht is able to offer the entire range of Utility Machinery and collaborates with site teams to implement successful projects.
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