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San Francisco Millennium Tower Has Settled 16 Inches
Misrepresents actual foundation geometry. Photos show deep excavation to ne
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High altitude foundation construction with Crux PDF Print E-mail
Written by Randy Post   
Tuesday, 12 January 2016 05:57

Crux Subsurface rig setup for the Rhinedollar Distribution Project in the Inyo National Forrest

This is an awesome limited access foundation project from Crux Subsurface! They designed and installed micropile foundations for new steel tubular towers to replace old steel latice structures. The high altitude (about 10,000 feet) meant limited construction season window, and challenges with the size of helicopter needed for loads. They also provided an innovative steel cap design to the micropiles, thereby avoiding the need to bring in additional concrete and rebar for a traditional micropile cap. Check out the excellent video below. [Source: Read more about the project at Crux Subsurface. Image: Crux]

Crux Rhinedollar Project Video

Rhinedollar Job Story 2015 from Crux Subsurface, Inc. on Vimeo.

Last Updated on Tuesday, 12 January 2016 13:01
 
Bertha Tunneling to Resume 1 Month Later Than Planned PDF Print E-mail
Written by Randy Post   
Thursday, 12 November 2015 22:47
The Bertha TBM after most of the repairs were completed

The Seattle Tunnel Partners JV announced last month that tunneling on the Alaska Way Viaduct Replacement project will resume a month later than originally planned. The Bertha TBM will resume mining on December 23 after a unique repair operation involving an access shaft. The tunnel boring machine is currently undergoing testing, and a jet grouting operation to tighten up the ground in advance of the TBM was undertaken last month. [Source: More at WSDOT Alaskan Way Viaduct Page. Image: WSDOT Flickr]

 
Golder Innovates for Subway Line in Stockholm PDF Print E-mail
Written by Randy Post   
Monday, 02 November 2015 23:31
Braced excavation for Stockholm's City Line project

Golder was the geotechnical designer for two of the most challenging segments of the Stockholm City Line in Sweden. Their work included foundation improvements for a tunnel beneath a historic portion of Stockholm, 3D modeling of rock mass deformations, and development of a specialty software for City officials to monitor the large data sets being gathered for the project, including settlements, ground water levels, vibrations, and more. [Source: Read more about this interesting project from Golder Associates. Image: Nicklas Wijkmark]

 
Protestors Cause Geotechnical Work to Shutdown for Sydney WestConnex Project PDF Print E-mail
Written by Randy Post   
Monday, 05 October 2015 23:34
Protestors of the proposed WestConnex project

Police were called out to one geotechnical investigation site in metro Sydney, Australia last week after residents unhappy with the proposed WestConnex project entered the work site. The crew abandoned drilling tools and equipment on the site, an apartment complex. WestConnex geotechnical contractors canceled another planned investigation as well based on the public reaction. Residents of the apartments were notified in advance of the work, and WestConnex indicated that the proper permission for drilling had been obtained from property owners and/or apartment complex management. But there is clearly a very vocal group of opponents to the project that would link the congested M4 motorway to Sydney Airport and Botany Bay. [Source: Read more about the protests in the Daily Telegraph. Image: Daily Telegraph]

 
Dewind Remediates Seepage at Dam in Tyler, Texas PDF Print E-mail
Written by Randy Post   
Wednesday, 23 September 2015 22:52

Dewind One Pass was involved in constructing a cut-off wall to address seepage issues at Tyler Dam in Tyler, Texas. The earthen dam was constructed of clay, but the foundation soil consisted of a very permeable silty sand material. The remediation involved a mixed-in-place soil, cement, and bentonite cutoff wall on the downstream face of the dam, about halfway between the crest and the toe. Dewind won the job, and the City's consulting geotechnical engineer narrates this video explaining everything about the project and gives them very glowing reviews. It is well worth your time to watch! [Source: Dewind YouTube Channel. Image: YouTube]

Last Updated on Thursday, 24 September 2015 05:55
 
Moretrench Remediates Dangerous Seepage Problem at Dam in Catskill Mountains PDF Print E-mail
Written by Randy Post   
Wednesday, 23 September 2015 22:09
Moretrench's Cannonsville Dam Project to remediate seepage encountered at the toe of the structure

Moretrench was contacted by NYCDEP after turbid water was noticed seeping from the toe of their Cannonsville Reservoir Dam, in the Catskill Mountains. The problem was determined to be related to an exploratory borehole conducted for a hydroelectric plant project that intercepted an artesian aquifer in the underlying glacial till. Moretrench first installed a series of wells to dewater the artesian unit using the Sonic drilling method. Once the artesian aquifer was depressurized, the owner was able to stop their reservoir draw down and Moretrench was able to grout the borehole to seal off the aquifer. As a geotechnical engineer, my take-away from this project is the dangers of creating very serious problems when drilling exploratory holes around an active dam if your boreholes are not properly abandoned. [Source: Read More about the project at Moretrench. Image: Moretrench]

 
Final three pieces of tunneling machine safely in the access pit PDF Print E-mail
Written by Randy Post   
Sunday, 13 September 2015 23:00
One of the final pieces of the Bertha TBM being lowered into place

The repaired cutterhead has been in the pit several weeks now, and the final three pieces of shielding for the Bertha TBM have been lowered into the access pit. Seattle Tunnel Partners team members will complete the reassembly of the machine, and manufacturer Hitachi Zosen will conduct a series of tests to make sure the TBM is fit to resume tunneling. The most recent STP schedule indicates they expect to resume tunnel boring in the later part of November. [Source: Alaskan Way Viaduct WSDOT. Image: WSDOT]

 
Tunneling machine's front end bolted in place PDF Print E-mail
Written by Randy Post   
Sunday, 30 August 2015 23:25

Bertha TBM cutterhead being lowered back into access shaft

The troubled Alaska Way Viaduct Replacement Tunnel TBM known as Bertha has reached a milestone in its repair. The front cutterhead has been repaired, and has been lowered back into the access shaft to be re-attached to the TBM. The time-lapse video below shows the cutterhead being lowered down into the access shaft. What caught my eye was the number of steel cables on the crane blocks...that's a heavy lift!

Time Lapse Video

[Source: WSDOT Alaskan Way Viaduct Project Page. Image: WSDOT]

Last Updated on Monday, 31 August 2015 06:29
 
Geocomp to Provide Engineering Services for Fukushima Ice Wall PDF Print E-mail
Written by Randy Post   
Monday, 27 July 2015 01:00

Ice wall to prevent migration of radioactive ground water at Fukushima Nuclear FacilityAfter the 2011 Fukushima earthquake, the reactors at TEPCO's nuclear facility began leaking radioactive groundwater. The plan to contain the contamination is to use ground freezing to construct an "ice wall" to cutoff the flow. Acton, Massachusetts based Geocomp has been contracted by TEPCO to provide engineering services for the ground freezing. Geocomp has subcontracted specialty geotechnical contractor and GeoPrac sponsor Moretrench to provide their specialty ground freezing expertise as well. Moretrench is a world leader in the design and construction of ground freezing projects. The Geocomp newsletter (from a few months ago) noted that the report deliverables will need to be provided in English and Japanese.

Image Source: wordlessTech

Last Updated on Saturday, 25 July 2015 07:49
 
Hatch Mott MacDonald Wins ACEC Grand Award for Niagara Tunnel Project PDF Print E-mail
Written by Randy Post   
Wednesday, 01 July 2015 00:24
The world's largest hard rock TBM breaks through on the Niagara Tunnel Project

Hatch Mott MacDonald received the prestigious ACEC Grand Award at the 2015 Engineering Excellence Awards Gala on April 21. ACEC had this project description in their program:

More than six miles long and 43 feet in diameter, the new Niagara Tunnel is the largest renewable energy project in the world. Providing much-needed power for the city of Niagara Falls, it is located deep beneath the city and is more than one and a half times wider than the English Channel Tunnel.

I blogged about this project a bit a number of years back, often pointing to the entertaining posts of a blogger and former insider in the Ontario tunneling and power industry who didn't have too many flattering things to say about the project! But it is clearly a remarkable project and deserving of the ACEC award. [Source: Tunnel Business Magazine. Image: Tunnel Business Online]

 
Bertha TBM Gets Spare Parts PDF Print E-mail
Written by Randy Post   
Sunday, 14 June 2015 15:59
Bertha's new bearing is delivered

The Bertha TBM just received a shipment of spare parts to repair the giant tunneling machine. The manufacturer decided to redesign the seal system to make it easier to access from the inside, if necessary. That's probably a good idea considering the prospect of a repair like this one once the machine is moving beneath downtown Seattle. Other improvements and repairs to the TBM include:

  • A new main bearing
  • Enhanced monitoring systems
  • Added steel to strengthen the machine and accommodate the new seal system
  • Widened openings at the center of the cutterhead
  • Extended arms to mix excavated soil in the chamber behind the cutterhead
[Source: WSDOT Alaskan Way Viaduct Project Page. Image: WSDOT Flickr Page]

 
Fugro Completes Major Offshore Geotechnical Investigation PDF Print E-mail
Written by Randy Post   
Thursday, 30 April 2015 15:27

Fugro geotechnical vessel MV Bucentaur

Fugro has completed one of the largest offshore geotechnical investigations in history according to Hydro-International.com. The investigation was performed by two vessels, MV Greatship Manisha and MV Bucentaur (pictured here), for DONG Energy's 1.2 gigawatt Hornsea Project One project which is located 120 km off the UK's Yorkshire coast. The investigation (contract valued at GBP13 million) consisted of 2,800 metres of seabed cone penetration testing and more than 5,000 metres of boreholes over a four month period. [Source: Hydro International. Image: Hydro International]

Last Updated on Thursday, 30 April 2015 22:32
 
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