11094 search results:

Dec 16, 2020

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Envirosight

Are you hoping to land municipal contracts but unsure of where to start? Now is a good time to amp up your efforts as cities scramble to complete essential work.

Nov 23, 2020

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Hannah Lee

Advanced technology from leak detection specialists Ovarro will support efforts to establish a reliable water supply in a Nepalese town.

Nov 17, 2023

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gwf Wasser | Abwasser

Tractebel and Aurecon form a strategic alliance to revolutionize dam projects in Queensland, Australia, combining their global expertise and local knowledge to meet the rising demand for dam upgrades.

Nov 20, 2023

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REMONDIS SE & Co. KG

An interview with Managing Director Robert Ristow

Nov 24, 2023

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TRACTO-TECHNIK GmbH & Co. KG

Budleigh Salterton is a popular and picturesque seaside town situated within the East Devon Area of Outstanding Natural Beauty. Located at the start of the stunning Jurassic Coast; a UNESCO World Heritage Site recognised for its outstanding rocks, fossils and land forms; it is a year-round tourist destination.

Nov 27, 2023

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REMONDIS SE & Co. KG

Digitising water management

Dec 01, 2023

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Trenchless Australasia

A microtunnel boring machine (TBM) has arrived on Elizabeth Street to help deliver one of the biggest upgrades to Melbourne CBD’s sewer network in more than a century.

Nov 29, 2023

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gwf Wasser | Abwasser

Researchers at MIT (Massachusetts Institute of Technology) have made a groundbreaking discovery that could change our understanding of evaporation, a ubiquitous process in our environment. They found that under certain conditions, light can directly cause evaporation without the need for heat, and it does so even more efficiently than heat.

May 12, 2024

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Jon Excell

Grid delays, planning delays, the ‘growing’ skills gap and supply chain problems will be rectified by the Labour party if it wins the next general election.

May 14, 2024

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Info Tiles

Norwegian digital analytics company, InfoTiles, known for its innovative use of artificial intelligence (AI) and machine learning (ML) in water and wastewater management, is extending its expertise to develop data-driven advancements in the energy sector.

May 17, 2024

News

Jon Excell

UK technology start-up Opteran is on a mission to transform the world of autonomy with advanced “natural intelligence” technology that mimics the brains of insects. Jon Excell reports.

Jul 08, 2024

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Trenchless Australasia

Yarra Valley Water is leveraging the benefits of trenchless technology to lessen impacts on the Upper Darebin Creek branch sewer project.

Jul 15, 2024

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Trenchless Australasia

Gippsland Water has completed two major projects to provide local communities with water security. Trenchless Australasia takes a look at the two projects helping increase water supply and improve sewer system capacity.

The spoil loosened at the working face with the aid of the cutting head is transported to the starting shaft by the spiral conveyor and is there collected in a spoil bucket. Using lifting tackle, this is lifted to the surface when full at determined intervals, usually after jacking a pipe piece. The pressure at the working face is mechanically balanced by the cutting head or by means of the soil plug that is formed in the front section of the conveyor …

(Image: Microtunnelling with auger spoil removal in single phase jacking - Variant: driving the cutting head with the spiral conveyor)
(Image: Microtunnelling with auger spoil removal in single phase jacking - Variant: direct driving of the cutting head and separately driven spiral conveyor)

Drive variants of the cutting head:

  • Variant A: driving the cutting head with the spiral conveyor
    The spiral conveyors (auger rods) and cutting head are fixed …
(Image: Example of cutting head driven with the spiral conveyor [Becke96]) (Image: Example of cutting head driven with the spiral conveyor [FI-Herreb])
(Image: Example of cutting head driven with the spiral conveyor [FI-Wirthb]) (Image: Example of cutting head driven with the spiral conveyor [FI-Schrö])

A distinction is made with regard to the discharge system, between

  • Suction plants
  • Pressure plants

The transfer point of the spoil to the respective discharge system, which at the same time acts as the point of pressure-tight separation between the excavation and crusher chamber, can be designed in a number of ways.

Rotary vane lock

(Image: HERRENKNECHT AVP method - View of the rotary vane lock behind the excavation chamber [FI-Herreb])

Spoil valve

Microtunnelling machines with pneumatic spoil removal are used with standard cutting heads as well as rock cutting heads so that the same areas of application are valid in soils and rock as with hydraulic spoil removal to [Becke96] [Wilhe99a].

(Image: Microtunnelling machine with pneumatic spoil removal (method AVP [FI-Herreb]) - Scraper cutting head with view of the rotary vane lock behind the excavation chamber)

(Video: Integrated high-pressure flushing system in the crusher space of the AVN microtunnelling machine)

(Image: Cutting wheel equipped with cutting knifes and rippers in the centre [FI-Herreb])

Standard cutting head:
Use in cohesive and non-cohesive soil in the form of cutting wheels with several spokes or more or less locked or lockable scraper cutting heads

(Image: Microtunnelling machine with hydraulic spoil removal -Rock cutting head with disc cutters [FI-Herreb])

Rock cutting head:
Use in rock and stony soil equipped with roller cutters in the …

(Image: Microtunnelling machine with hydraulic spoil removal - Standard cutting head in the form of cutting wheels [FI-Wirthb]) (Image: Cutting head design for use in soil and rock - Scraper cutting head with fixed soil entry openings [FI-ICH])

Standard cutting heads

(Image: Cutting head design for use in soil and rock - Rock cutting head with (tungsten carbid) insert roller cutters [FI-Wirthb]) (Image: Cutting head design for use in soil and …

Mar 15, 2021

News

Saki M. Moysidis

MC-Bauchemie has launched a new multifunctional flexible sealant in the form of its new “MC-Injekt 2300 flow” injection resin. The system is based on new Water-Boost Technology® from MC-Bauchemie and offers an impressive array of excellent injection properties.

Mar 16, 2021

News

Katy Delaney

Battelle research shows that analyzing wastewater for the presence of the virus that causes COVID-19 can pinpoint specific neighborhoods that are hotspots for viral outbreaks.