Transportation

Polk County US-64 Rockslide Update For December 15 &16

Wednesday, December 16, 2009 | 04:44 pm
A tracked hoe-ram works to break-up large boulders into manageable sizes in order to begin hauling away debris from the site
A tracked hoe-ram works to break-up large boulders into manageable sizes in order to begin hauling away debris from the site
Contractor Breaking Boulders in Preparation for Hauling
 
CHATTANOOGA, Tenn. – Crews with Charles Blalock & Sons and Dyno Nobel set off two separate explosive charges on Tuesday to remove a portion of the unstable rock slope on the west side of the slide area.  The contractor continued hand scaling on the main slide area to remove loose rocks and debris today while a tracked hoe-ram worked on the roadway surface to break-up the boulders into manageable sizes in order to load them onto dump trucks and haul them from the site.
 
The contractor plans to continue drilling for the remainder of the week on the western rock slope to prepare for trim blasting operations which are scheduled for next week.  The contractor will also continue breaking up the boulders on the roadway surface so that hauling operations can resume.
 

Nighttime & Weekend Total Closures Planned for US127 in Hamilton County

Tuesday, December 15, 2009 | 01:58 pm
Chattanooga, Tenn. – Tennessee Department of Transportation emergency contract crews will totally close US-127 each night between 9:00 p.m. and 6:00 a.m. on Wednesday, December 16 and Thursday, December 17. Each morning the roadway will be reopened to one lane beginning at 6:00 a.m. US-127 will also be closed throughout the weekend. The roadway will be totally closed from 9:00 p.m. Friday, December 18 until 6:00 a.m. Monday, December 21. 

Polk County US-64 Rockslide Update For December 14

Monday, December 14, 2009 | 04:12 pm
Crews unload the blasting mat that will be used during the construction of a rockfall fence on the eastern side of the slide
Crews unload the blasting mat that will be used during the construction of a rockfall fence on the eastern side of the slide
Crews move the blasting mat
Crews move the blasting mat
CHATTANOOGA, Tenn. – This weekend, crews continued drilling operations using a track mounted drill rig on a crane platform.  The holes were drilled into the western face of the rock slope in preparation for trim blasting operations that took place this morning and this afternoon.  The contractor also continued scaling loose rock and debris from the eastern side of the slope in preparation for upcoming drilling and trim blasting that will occur as the work progresses eastward.
 
Blasting mats, which will be used for the construction of a rockfall fence on the eastern side of the slide to protect the cable bridge and TVA dam, arrived on site today and will be assembled this week.
 

Polk County US-64 Rockslide Update For December 11

Monday, December 14, 2009 | 09:35 am
Crew loading for trim blasting
Crew loading for trim blasting
Trim Blasting Continues on West Slope
 
CHATTANOOGA, Tenn. – Today, crews continued with trim blasting by setting off a series of trim blasts on the western side of the slide area to remove an unstable plane of rock on the slope face.  The blasts were set off removing 20’ by 20’ sections of the unstable slope as part of the overall remediation plan.  Crews also worked on the east side of the slope where they continued scaling operation to remove loose debris to make the work area below safe for drilling operations to take place.  A catchment pad of loose gravel was dumped on the roadway surface below the eastern side of the slope.  The blanket of gravel serves as an energy dissipater for falling boulders to lessen the possibility of the boulders striking TVA Dam #2 or the cable anchor bridge suspended above Dam #2.
 

Polk County US-64 Rockslide Update for December 10

Thursday, December 10, 2009 | 04:23 pm
CHATTANOOGA, Tenn. – Today, crews with Blalock & Sons and subcontractor Dyno Nobel set off a series of trim blasts on the western side of the slide area to remove an unstable plane of rock on the slope face.  Several small blasts were used to remove 20’ by 20’ sections of the unstable slope as part of the overall remediation plan.  On the eastern side of the rockslide, crews continued scaling the area to remove loose debris and make the area below safer for drilling.  A catchment pad of loose gravel was dumped on the roadway surface below the eastern side of the slope to help absorb energy from falling boulders.  The blanket of gravel lessens the possibility of boulders striking TVA Ocoee 2 Dam or the cable anchor bridge suspended above the dam.
 
The contractor plans to continue blasting on the west side of the slope tomorrow and is scheduled to begin hauling blast and slide debris from the site as soon as possible. This will allow the contractor to continue to progress eastward with drilling and trim blasting operations.  Debris removal work is expected to continue through the weekend.
 

TDOT Awards Emergency Contract for Repairs to US-127 on Signal Mountain

Thursday, December 10, 2009 | 03:57 pm
TDOT workers assess the damage to US 127, also known as Signal Mountain Road, caused by heavy rains
TDOT workers assess the damage to US 127, also known as Signal Mountain Road, caused by heavy rains

Roadway will be closed for weekend around the clock repairs

Chattanooga, Tenn. – The Tennessee Department of Transportation today awarded an emergency contract to repair a section of U.S. Highway 127 on

Signal Mountain to Wright Brothers Construction of Charleston, Tennessee. Heavy rains caused a portion of the roadway near log mile 15.9 about a half mile from the Signal Mountain city limits to collapse on Wednesday, December 9. 

The contractor will close the roadway at 10:00 p.m. on Friday, December 11 at the site of the roadway failure. The road will remain closed until 6:00 a.m. Monday, December 14. At that time traffic will be restored to one lane.  

Polk County US-64 Rockslide Update for December 9

Wednesday, December 09, 2009 | 04:39 pm
Recent rains cause water to overtop the Ocoee 2 Dam adjacent to the US-64 Rockslide
Recent rains cause water to overtop the Ocoee 2 Dam adjacent to the US-64 Rockslide
Workers perform sacaling work on the east side of the rockslide
Workers perform sacaling work on the east side of the rockslide
CHATTANOOGA, Tenn. – Crews with contractor Charles Blalock & Sons continued drilling the unstable rock face on the west side of the main slide area as they prepare for a series of trim blasts that will begin the morning of Thursday, December 10. More than 100 individual holes have been drilled during the last week. Those holes will be loaded with explosives and charges will be detonated incrementally in order to remove small sections of unstable rock at a time. This will minimize seismic activity at the TVA Ocoee 2 Dam which is currently overtopping due to recent rains. The trim blasts are intended to break up an unstable rock seam and expose an underlying layer of stable rock that will be less susceptible to future slides. Crews also continued scaling operations today on the upper east side of the slide mass to remove loose boulders and debris and to make it safer for drilling operations to take place as work progresses to the east.
 
The contractor plans to begin removing debris from the roadway surface beginning Friday, December 11 and will work from the west to the east in order to allow the 275 ton crawler crane to continue eastward with drilling and trim blasting operations. The debris and boulders will be broken up into manageable sizes using a ram-hoe and then will be loaded onto dump trucks and hauled from the site. It is expected that it will take approximately 3000 to 4000 dump truck loads to completely remove the slide debris from the site.
 

Polk County US-64 Rockslide Update for December 7

Monday, December 07, 2009 | 04:10 pm
Crews drill holes into the mountainside in preparation for blasting operations scheduled for Thursday.
Crews drill holes into the mountainside in preparation for blasting operations scheduled for Thursday.
CHATTANOOGA, Tenn. – Today, crews with contractor Charles Blalock & Sons Construction continued drilling on the western side of the rockslide in preparation for a series of trim blasts scheduled for Thursday, November 10, weather permitting.  Trim blasting includes workers drilling holes into an exposed layer of unstable rock, then packing the holes with explosives and detonating the charges. The blasts remove any unstable rock and leave behind a stable rock face that is less susceptible to future slides.
 
On Friday, the contractor plans to begin removing slide and blast debris from the roadway using a tracked hoe-ram to break up larger boulders and a track hoe to load the debris into dump trucks for hauling.  

TDOT to Launch Weekly US-64 Rockslide Project E-Newsletter

Friday, December 04, 2009 | 02:51 pm
CHATTANOOGA, Tenn. —The Tennessee Department of Transportation will launch a new weekly e-newsletter next week to help keep people informed about ongoing work to remove a massive rockslide from U.S. 64 in Polk County. People can sign up now to receive the newsletter through the TDOT web site (www.tn.gov/tdot).
 
The newsletter will include weekly updates about the slide removal operations as well as photos of the work. Those interested may subscribe to TDOT’s US-64 rockslide e-newsletter by clicking on “Get E-mail Updates” from the “U.S. 64 Closure near Ocoee River” updates page (www.tn.gov/tdot/US64rockslide). 
 

Polk County US-64 Rockslide Update For December 4

Friday, December 04, 2009 | 02:29 pm
Truck dumping material for crane pad
Truck dumping material for crane pad
Extending the crane pad
Extending the crane pad
Crane Pad Extended
 
CHATTANOOGA, Tenn. – Today crews with Charles Blalock & Sons worked to extend the crane pad located on the west side of the slide area to allow the 275 ton crawler crane to move further to the east for more drilling and trim blasting operations. The pad, constructed of approximately 90 tons of rock and crushed stone, is necessary to ensure the crane and its 300’ long boom operate on a level and stable surface. Workers also continued working along the face of the slope using hand tools to remove loose rocks and debris that would otherwise present a hazard to workers and equipment that will be operating on the roadway surface below. 
 
Hand scaling, drilling, and trim blasting operations are expected to continue through Sunday as weather permits.