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20.10.2020 (846 Clicks)

Hochtief Subsidiary Cimic enters Sale Agreement with Elliott for 50% of Thiess

• Valuing Thiess at AUD 4.3 billion (100% enterprise value)
• Realizing cash proceeds of AUD 1.7 billion to AUD 1.9 billion to Cimic

20.10.2020 (1273 Clicks)

New Integration advances the Planning, Design and Development of Urban Environment

RobertsDay has joined the Hatch group of companies bringing together Australian thought leaders in urban solutions with global experts in infrastructure, engineering and construction.

20.10.2020 (760 Clicks)

Fugro completed a Piping Research Project in Cooperation with the Friesland Water Authority and Deltares

The research investigated the erosion of tidal sand in protective sea-dikes along the Wadden Sea coast in the Dutch province of Friesland and represents a significant development in the Dutch Flood Protection Programme. Water seeping through the dike has the potential to develop tiny channels (piping) that wash sand away and could cause the dike to fail. This critical research aims to identify conditions that influence this mode of dike failure, particularly during periods of high water.

20.10.2020 (805 Clicks)

Hatch announces new Director of Smart Port Strategy

Hatch welcomes Michael Houen as director of smart port strategy.

20.10.2020 (771 Clicks)

Skanska to upgrade Gråsjø and Trollheim Hydro Electric Power Plant Dams in Norway

Skanska signed a contract with Statkraft Energi AS for the refurbishment and upgrade of four dams and one flood gate. The contract is worth NOK 508 M, about SEK 485 M, which will be included in the Nordic order bookings for the third quarter 2020.

20.10.2020 (725 Clicks)

Congratulations: 100 Years Halbach & Braun!

100 years of innovative, reliable and customized technology from Halbach & Braun!

We are very proud to celebrate our 100th company anniversary.

Halbach & Braun is well-known worldwide for innovative and sustainable mining, equipment for open pits, quarries and much more. 100 years of experience and, above all, high-quality and reliable solutions, adapted to the demands of our customers, have been and still are the most important prerequisites for our success. We have always been able to meet the high demands of our customers and will continue to do so in the future.

19.10.2020 (609 Clicks)

GeoTHERM moves to June 2021

The date is set. The GeoTHERM changes its date and will take place on June 24th + 25th 2021 at the Exhibition Center Offenburg.

16.10.2020 (637 Clicks)

Liberty Steel Group makes an offer to acquire Thyssenkrupp Steel Europe

Liberty Steel Group, part of sustainable industry leader GFG Alliance, has today announced that it has made a non-binding indicative offer (NBIO) as part of a Thyssenkrupp-led process to acquire the steel activities of Thyssenkrupp. Liberty Steel is a global steel and mining business with annual revenues of about US$ 15 bn/ € 13 bn and 30,000 employees in more than 200 locations on four continents.

16.10.2020 (675 Clicks)

Tried and Tested Robbins TBM and Conveyor complete Ohio River Tunnel

A 6.5 km (4 mi) long tunnel for wastewater storage below Louisville, Kentucky, USA has more to it than meets the eye. “At first glance, this seems like a straightforward project, but it turned out to be much more challenging,” said Shemek Oginski, Project Manager for the contractor, a joint venture of Shea/Traylor. The 6.7 m (22 ft) diameter Robbins Main Beam TBM and conveyor system had to cope with overstress in the crown that resulted in significant rock fallout in seven different areas, as well as methane gas in the tunnel. By the machine’s breakthrough on September 22, 2020, the crew had much to celebrate.

The machine was refurbished and consisted of older components as well as a brand new cutterhead supplied by Robbins and completely rebuilt electrical and hydraulic systems. “This was definitely an older machine — I actually operated it on the DART [Dallas Area Rapid Transit] tunnels in Dallas, Texas in the 1990s, but with many of the components being new we were confident in it,” said Oginski.

The original tunnel was expected to be 4 km (2.5 mi) long, but a change order added to the length by 2.1 km (1.3 mi). The extension was ordered by the owner, Louisville Metropolitan Sewer District (MSD), and its Engineer-of-Record Black & Veatch in order to eliminate four surface CSO storage basins. That included one basin originally located at the site of the TBM breakthrough, explains Oginski: “The original CSO site was located in close proximity to Beargrass Creek and had flooded multiple times. It was decided to extend the tunnel to that site in order to use the tunnel as storage instead, and connect it to the sewer system.” MSD installed a sheeting wall to protect the site from floodwaters while Shea-Traylor installed liner plate in the retrieval shaft, resulting in a site that is in much better shape.

It was in the 2.1 km (1.3 mi) extension, essentially a bifurcation of the main tunnel, where the crew encountered much of the crown overstress. “The longest section of overstress was 700 m (2,300 ft) and took two and a half months to get through,” said Oginski. The crew switched up the prescribed rock bolt pattern of four to six bolts at 1.5 m (5.0 ft) centers, and instead installed six bolts at 1 m (3 ft) centers. “It worked out to two rows per push. When that wasn’t enough, we installed wire mesh in the crown, mine straps, and channels. It definitely took extra time to install steel support, remove loose rock, and deal with the rock coming down so we could install rock support safely.” Overbreak varied from a few inches above the machine to 30 cm (1 ft) or more.

“We also had encountered natural methane gas in the tunnel just shortly before holing through,” said Oginski. The methane was discovered while the crew were probing out 150 ft ahead of the machin — something that the crew did continuously throughout the bore, using one, two or four probe holes depending on the geology. “We were down for about two weeks and were able to contain the methane within the cutterhead, where concentration spiked at 100% LEL. We were able to resume work after systematically ventilating, probing and grouting multiple times.”

Despite the challenges, the TBM was able to achieve up to 658 m (2,159 ft) in one month and 192 m (630 ft) in one week. The Robbins conveyor, including a 68.6 m (225 ft) long vertical belt, made this progress achievable, said Oginski: “The conveyor is definitely the way to go, especially for longer drives. There was quite a difference in performance between the extension tunnel, which we mined with lift-boxes, and mining with the conveyor. Our best month in the extension tunnel with the boxes was 221 m (725 ft), so that is a big difference.”

With tunneling now complete, Oginski is “definitely proud that we got to the end, as this is a challenging project.” The contractor is removing the components of the TBM to be stored in their yard in Mt. Pleasant, PA, and sees future applications for the equipment. “If the right project comes up then yes, it’s likely we would use this machine again.”

Source: The Robbins Company

                     

16.10.2020 (731 Clicks)

Solmax launches online Geosynthetic Drainage Tool for Design Engineers

Geosynthetics play a vital role in the containment of solid and liquid waste in landfills, mining, energy, construction and oil & gas applications. To help design engineers accurately specify the materials needed, Solmax has launched an important online resource for engineers – its Geosynthetic Drainage Tool.