Project summary


Download 17.43 Kb.

Sana26.05.2018
Hajmi17.43 Kb.

D

R I L L E D

S

H A F T S



T

I E B A C K

A

N C H O R S



Pennsylvania Turnpike Reconstruction

New Stanton, Pennsylvania

PROJECT SUMMARY



C

ONSTRUCTION

& G

EOTECHNICAL

S

ERVICES

N

EW



J

ERSEY


F

LORIDA



N

EW



Y

ORK


M

ASSACHUSETTS



P

ENNSYLVANIA



D

ELAWARE



W

ASHINGTON



, DC

MORETRENCH.COM

Built in 1940 and hailed as America’s first

Superhighway, the original 160-mile stretch of the

Pennsylvania Turnpike, between Irwin and Carlisle,

has been undergoing a phased total reconstruction

and widening since the late 1990s. Near the New

Stanton interchange, where a residential area lies

close to the mainline roadway, work included the

construction of a sound barrier approximately 3,500

feet in length. The general contractor for this section

of roadway and interchange reconstruction, Trumbull

Corporation of West Mifflin, PA, awarded

Moretrench the drilling sub-contract for the

installation of the sound barrier foundations. A

wingwall supporting mainline traffic was also

retrofitted under the same contract.



Sound Barrier Foundations

The sound barrier was designed as a steel beam and

precast lagging structure ranging in height from 15 to 20

feet. To counteract wind loads, the steel beams were

anchored to 36-inch diameter drilled shaft foundations

installed at 12 feet on center.  Shaft drilling, concreting

and setting of the anchorage system was a coordinated

effort between Moretrench and Trumbull. 

At each of the 281 shaft locations, Moretrench

augered through the upper 15 feet of silty clay

overburden to top of rock and then drilled out a 30-

inch diameter rock socket to an average depth of 7

feet. Trumbull followed close behind to lower the

0 FT


-15 FT

-22 FT


Steel Beam &

Precast Panel

Sound Barrier

36-Inch


Diameter Shaft

SILTY CLAY

OVERBURDEN

30-Inch Diameter

Rock Socket

ROCK


4,000  PSI

Concrete


Reinforcing

Cages


Top Right: Augering of 36-inch diameter holes for the sound barrier

foundations.

Bottom Right: Cross section showing completed foundation and

anchor bolt assembly.

dual reinforcing cage assembly, set the anchor bolts, and

tremie 4000 psi concrete in place to complete the

foundation. 

Wingwall Reinforcement 

The wingwall was located at one end of a highway that

crossed beneath the Turnpike mainline. Since mainline

expansion and the creation of a new shoulder would place

additional weight on the wall, installation of three, double-

corrosion protected, 4-and 5-strand tieback anchors was

specified as a precaution against potential movement. 

Specifications called for the anchors, which varied in

capacity from 75 to 105 kips, to be installed on an

approximate eight feet horizontal spacing, with the lower

two anchors stepping down two feet. Working from an

earth bench placed by Trumbull, Moretrench used duplex

drilling techniques to advance each drill hole at 15° from

horizontal through the predominantly silty gravel fill

material and terminated in limestone bedrock. The

anchor assembly was placed, and the annulus between

the anchor and the drill hole was filled with Type II

Portland cement grout for the full length of the hole.

Following a 7-day grout curing period, the anchor head

was placed and the anchor was proof-tested to 133% of

design load before being locked off. 

More to Moretrench

Tieback anchors and deep foundation drilling are just two

of the specialty techniques that Moretrench offers. The

company’s wide range of services caters to virtually all

subsurface conditions and project applications, allowing

Moretrench to offer the optimum solution, or solutions,

to problems ranging from the straightforward to the most

complex. 



M

ORETRENCH

100 Stickle Ave., Rockaway, NJ  07866

Tel: 973-627-2100 | Fax: 973-627-3950

MORETRENCH.COM

PROJECT SUMMARY



Pennsylvania Turnpike Reconstruction, continued

Top: As drilling progressed, Trumbull followed close behind to lower the

reinforcing cages in place. 

Bottom: Tieback anchors were also installed under the same contract to

reinforce a nearby wingwall.


Do'stlaringiz bilan baham:


Ma'lumotlar bazasi mualliflik huquqi bilan himoyalangan ©fayllar.org 2017
ma'muriyatiga murojaat qiling