Projects - Hand Tunneling - Bradshaw Construction Corporation

TUNNELING SPECIALISTS SINCE 1963

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The work we do is…
challenging. . .innovative. . .underground. . .
making us tunneling specialists.

COMPANY HISTORY
By combining superior craftsmanship developed throughout its early years, with innovative tunnel engineering and construction technology, Bradshaw successfully provides cost effective tunneling solutions to the utility and transportation industries.
Company

ABOUT US
Bradshaw Construction Corporation is a leading contractor in the tunneling industry. With over five decades of experience, we've earned respect as technological innovators through the construction of highly difficult tunneling projects.
VISION/MISSION/VALUES
We will safely and profitably build tunnels with our staff of knowledgeable, trustworthy, performance driven professionals.

TESTIMONIALS
"Bradshaw Construction is one of the best tunneling companies I have worked with. The personnel are first in class with safety, tunneling knowledge and problem resolution. Their equipment looks well maintained and clean."

SAFETY

Bradshaw Construction Corporation’s number one core value is the safety of its employees. Therefore, it is our primary goal to provide a safe and healthy working environment.

EQUIPMENT FLEET

Bradshaw Construction Corporation owns and operates an expansive fleet of heavy and underground construction equipment. The size of our fleet ensures every project is properly equipped and operating efficiently.

Projects

PROJECTS

Throughout our years of tunneling, Bradshaw Construction Corporation has worked on many complicated, sophisticated, and cutting edge projects. Each of those projects led us to find innovative solutions to unique problems. We invite you to take an in-depth look at projects where you will see the problems we encountered and how we solved them. Click to view all projects...

PROJECT MAP

MICROTUNNELING	TBM TUNNELING	HAND TUNNELING	PIPE REHAB	SHAFT WORK

Slurry Pilot Tube	Conventional Supports Pipe Jacking	Drill and Blast NATM/SEM Steel/Wood	Sekisui SPR Slip Lining	Concrete Caisson NATM/SEM Steel/Wood

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Microtunneling
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HAND TUNNELING

Drill and Blast

NATM/SEM

Steel/Wood

SORT BY PROJECT NUMBER | LOCATION | PROJECT TYPE

619 - OWSP Quarry Intake
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Drill and Blast	Winchester, VA	Frederick Water	Rock	312 x 120
	SUMMARY: Water supply project in abandoned quarry. 312' of 10' horseshoe tunnel in limestone rock for underground intake. Drill & blast exacavtion using rock bolt supports suplemented as needed with welded wire fabric and shotcrete. Final lining was 4" of synthetic fiber reinforced shotcrete. Complete Project Profile

605 - Jones Falls Sewershed
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Baltimore, MD	City of Baltimore DPW	Mixed Face	(2) 23' x 48" & 72" Ø
	SUMMARY: Bradshaw Construction Corporation installed two 23' parallel liner plate tunnels (48" & 72") underneath Falls Road for a sanitary sewer installation. 18" and 54" ductile iron pipe was installed and backfilled in the tunnels after completion. The tunnels passed directly underneath twin 66" x 84" storm culverts, installed through clay with boulders/shot rock overlaying partially weathered rock in... Complete Project Profile

592 - Virginia General Assembly Building Pedestrian Tunnel
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	NATM/SEM	Richmond, VA	VGS	Soft Ground
	SUMMARY: Construction for the new Virginia General Assembly Building in Richmond, included a pedestrian tunnel under 9th Street to connect a new parking garage. Bradshaw proposed a SEM tunnel for the passage that was accepted by the Owner. The tunnel excavation was 21.08' wide x 15.10 high and excavated by header & bench under 12' of cover. Groundwater was about 22' below the pavement. 4 dewatering wells... Complete Project Profile

576 - CSX Transportation Howard St. Tunnel, Camden St. Drain Replacement
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Baltimore , MD	CSX Transportation	Soft Ground	68' x 48" & 32' x 66" Ø
	SUMMARY: Bradshaw completed this high profile project in downtown Baltimore, MD as part of a design-build team. An existing storm drain located in the invert of the Howard Street CSX Rail Tunnel had been the cause of frequent flooding. This project replaced that 48” storm drain with a larger, deeper siphon drain which eliminated the flooding and allows CSX to increase the depth of the existing tunnel... Complete Project Profile

566 - N. St. Elmo Drainage System Upgrade
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Chattanooga, TN		Mixed Face	332' x 84" & 250' x 75"
	SUMMARY: Bradshaw constructed three tunnels as part of a stormwater sewer improvement project for the City of Chattanooga. Bradshaw originally intended to construct the 84" liner plate tunnels and 72" direct-jack FRP tunnel with conventional tunnel boring machines. However, the local foundry sand fill material contained numerous obstructions, with slag, bricks, reinforced concrete, glass and various trash... Complete Project Profile

559 - Glenmont Rock Handmine
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Wheaton, MD	Winchester Homes	Rock	22' x 36" x 36"
	SUMMARY: Our client had concerns about breaking rock with a hoe ram so close to an existing water main. Instead, Bradshaw installed two tunnels hand mined through rock under the existing water main. The first one went so well that a second tunnel was added after the first one was completed. The rock was removed via drilling and splitting with pneumatic breakers, and then a steel sleeve was installed as... Complete Project Profile

558 - Condenser Water Piping Renewal, Building 7 (JHU / APL)
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Laurel, MD	JHU	Mixed Face	29' x 36" x 36"Ø
	SUMMARY: Bradshaw installed two 36 inch x 36 inch wood box tunnels, 10 linear feet and 19 linear feet long respectively, as part of a project aimed at upgrading the infrastructure at the Applied Physics Laboratory (APL). The woodbox tunnels were installed directly under two existing active corridors. The hand mined wood box technique was selected over auger boring due to the smaller work area, and the... Complete Project Profile

557 - I-89 Culvert Improvements
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	NATM/SEM	Georgia, VT	VTRANS	Soft Ground	236' x 20.5' W x 13.5' H Ø
	SUMMARY: Bradshaw completed construction of two storm drain tunnels under Interstate 89 to replace the failing 72 inch CMP stream culverts. The total excavation was 20.5' wide x 13.5' high horseshoe tunnel. The lengths were 136 and 100 feet. The finished inner diameter of the precast culverts were 15' wide x 8.5' high. The tunnels were constructed using the sequential excavation method (SEM) consisting... Complete Project Profile

555 - DLCO Bates Street Tunnel (Carson Circuit)
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Pittsburgh, PA	City of Pittsburgh	Mixed Face	58' x 53" x 52"
	SUMMARY: Bradshaw Construction Corp. has recently completed the installation of 58 linear feet of 48 inch wood box tunnel as part of Duquesne Light’s Carson Circuit Project in Pittsburgh, PA. The tunnel was hand mined under Bates Street in soil that consisted primarily of decomposed shale. Complete Project Profile

546 - Myrtle / Morehead Storm Drainage Improvements, Phase 1
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	NATM/SEM	Charlotte, NC	City of Charlotte	Mixed Face	150' x 13" Ø
	SUMMARY: Bradshaw constructed a 13’ horseshoe shaped tunnel 20’ under Morehead Street in downtown Charlotte, NC. The 150’ long was tunnel part of a storm drainage improvement project. The tunnel was designed & constructed using the sequential excavation method (SEM), a hand mine technique using reinforced shotcrete for initial tunnel support. Portions of the tunnel were in mixed face conditions... Complete Project Profile

539 - Liberty Heights Handmine
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Baltimore, MD	City of Baltimore	Rock	16' x 48" x 48"
	SUMMARY: Bradshaw installed 16 linear feet of a 48 inch woodbox tunnel in rock under Hilton Street. The tunnel accommodated a new sewer line in a residential area of the City of Baltimore. Tunneling was preferred over open cut by both the owner and the general contractor due to the disturbance associated with open cut rock excavation. Complete Project Profile

538 - Service Customer Built - DC-3rd & H Street, NW
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Washington, D.C.	District of Columbia	Soft Ground	16' x 48" x 48"
	SUMMARY: Bradshaw installed approximately 16 feet of 48 inch woodbox tunnel and ductbank to connect an existing basement to an electrical vault in downtown Washington, DC. Tunneling was deemed a more suitable alternative to traditional trenching methods, because tunneling avoided disruption to road and pedestrian traffic, and eliminated the need to demolish and replace existing surface improvements. Complete Project Profile

537 - Johns Hopkins Hospital Nelson Harvey Extension Enhancements, Wolfe Street
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Baltimore, MD	Johns Hopkins Hospital	Mixed Face	85' x 48" x 48"
	SUMMARY: Bradshaw Construction was contracted to hand mine a 48 inch by 48 inch wood box tunnel to house a 10 inch polyvinyl chloride pipe and an 18 inch ductile iron pipe. Unanticipated rock was encountered during mining and was removed with pneumatic chisels and hammers. The tunnel was performed due to the close proximity of existing buildings and structures which did not allow for open cut... Complete Project Profile

536 - Emergency Generator Replacement John Adams Building
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Washington D.C.,	The Architect of the Capitol	Soft Ground	12' x 60" Ø
	SUMMARY: Bradshaw installed 12 linear feet of a 60 inch liner plate tunnel in sandy material under a security wall footing at the John Adams Building in downtown Washington, DC. The tunnel allowed for the connection of a new stormwater management structure to an existing manhole, without disruption to surface features or pedestrian traffic. Complete Project Profile

529 - McMillian Stormwater Storage
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Washington D.C.,	DCW	Soft Ground	35' x 72"Ø
	SUMMARY: Bradshaw Construction completed two shafts and a hand mine liner plate tunnel as part of a storm water overflow project in northwest Washington DC. As a result of flooding in the area, DC Water decided to convert a more than 100 year old sand filtration chamber into a storm water overflow basin. Bradshaw was subcontracted to install 28 vertical feet of 25 foot diameter shaft while working from... Complete Project Profile

528 - Children's Hospital of Richmond Pavilion
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Richmond, VA	VCU-CHoRP	Soft Ground	180' x 96"-132" Ø
	SUMMARY: As part of a design/build project, Bradshaw Construction constructed two utility tunnels for the extension to the Children's Hospital of Richmond. Excavation for the first tunnel consisted of 132 inch diameter liner plate with 96 inch reinforced concrete pipe as final lining. The ground conditions were lean clays overlaid with gravely sand in the crown. The second tunnel was for 96 inch liner... Complete Project Profile

522 - Holy Cross Hospital-Silver Spring-Phase 1B
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Silver Spring, MD	Holy Cross Hospital	Rock	40' x 48" x 48"
	SUMMARY: Bradshaw constructed a 48 inch by 48 inch (ID) wood box tunnel under the loading dock for the Holy Cross Hospital in Silver Spring. MD. The over all project was to expand the campus to include a new patient tower for 150 new private patient rooms, a four-level parking garage expansion to accommodate an additional 300 parking spaces, and the central utility plant serving the existing campus... Complete Project Profile

518 - New Ragged Mountain Dam
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Drill and Blast	Charlottesville, VA	RWSA	Rock	482' x 114"Ø
	SUMMARY: As part of improvements to increase the capacity of the Ragged Mountain Dam in Charlottesville, VA a tunnel was built to convey primary spillway discharges and house the 36 inch diameter raw water intake pipe which will convey water from the reservoir to the existing treatment facilities near the University of Virginia campus. The 10-foot horseshoe shaped tunnel was 482-feet long. It was... Complete Project Profile

498 - Lafayette Street Pedestrian Tunnel
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Tallahassee, FL	FDOT	Soft Ground	55' x 144 " Ø
	SUMMARY: Bradshaw Construction built a 55' long hand mine liner plate tunnel for Florida State University to prevent pedestrian overflow onto Lafayette Street after FSU football games. Bradshaw has a long history of building liner plate tunnels; what made this project unique was the active CSX railroad tracks only 6.5' overhead. Trains traveled over the tunnel many times per day during construction... Complete Project Profile

490 - Little Patuxent Sewer Phase 3
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Drill and Blast	Savage, MD	Howard County	Rock	355' x 96" Ø
	SUMMARY: Bradshaw Construction hand drilled and blasted a 96 inch tunnel, 355 linear feet in length, to accommodate a 42 inch FRP sanitary sewer. A combination of 96" horseshoe ribs and wood lagging, as well as rock bolts and wire mesh were used to support the seamy and blocky rock patterns. Rock samples showed rock with unconfined compressive strength greater than 55 KSI. There were noise... Complete Project Profile

486 - Kennesaw Pedestrian Tunnel
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Kennesaw, GA	Kennesaw Pedestrian Tunnel	Soft Ground	115' x 13' Ø
	SUMMARY: Bradshaw hand tunneled 7 feet under a busy CSX Railroad serving Atlanta, GA to install 115 feet of 13 foot diameter tunnel with only 5'-7' of cover between the tunnel and the tracks. The tunnel supports were steel liner plate lined with epoxy paint. It was part of a new park celebrating railroad history and provided a much needed pedestrian underpass. Compensation grouting and real-time... Complete Project Profile

476 - Kirkwood Road Tunnels
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Arlington, VA	Dominion Power	Mixed Face	276' x 48" x 48"
	SUMMARY: Bradshaw Construction completed 276' of 48" x 48" hand-mined wood box tunnels for electrical conduit. The main challenges of the project were not known when the project began. The tunnels were supposed to be in soft ground, but partially complete with the first tunnel our crew encountered some hard rock. There was great difficulty in removing the rock for 25' of the tunnel without blasting or... Complete Project Profile

471 - Suwanee Pedestrian Tunnel
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Suwanee, GA	City of Suwanee	Soft Ground	62' x 156 " Ø
	SUMMARY: Bradshaw Construction installed 62' of 156" steel liner plate tunnel by conventional hand mine methods through a railroad embankment for a pedestrian tunnel. Hand mine techniques were utilized to install the liner plate tunnel under an active Norfolk Southern Railroad with only 7' of cover. Mining took six days to complete, working around the clock. After completion of the excavation, a shotcrete... Complete Project Profile

461 - Briar Creek Relief Sewer Phase 1B
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Charlotte, NC	Charlotte-Mecklenburg Utility Dept.	Mixed Face	165' x 96" Ø
	SUMMARY: Bradshaw was contracted to install 165 linear feet of 60 inch fiber reinforced water main pipeline in South Charlotte, NC. The carrier pipe was housed within a 96" liner plate tunnel support system. This was part of Charlotte Utility Department's $1-Billion, 5-year, Capital Improvement Plan. Complete Project Profile

459 - Knight Theater Tunnels
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	NATM/SEM	Charlotte, NC	Wachovia Bank	Mixed Face	160' x 13' x 16.5'
	SUMMARY: Bradshaw Construction designed and built two 13' tall by 16.5' wide shotcrete horseshoe-shaped tunnels, totaling 160', for the city of Charlotte, NC. The tunnels were designed as initial/final shotcrete linings, with a sprayed water barrier between shotcrete layers. In addition, the mix design was supplemented with a cementitious admixture to develop internal water resistant properties in the... Complete Project Profile

457 - Battery Park Trunk Sewer Tunnel
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Richmond, VA	City of Richmond	Soft Ground	200' x 96" Ø
	SUMMARY: As part of a new 3,400' by-pass sewer tunnel, Bradshaw also hand tunneled a total of 200’ of 96” liner plate for a 72” fiberglass storm sewer pipe. Each hand tunnel intersected the 144" rib and board tunnel for underground Y connections or was combined in three way manholes at the shafts. Just as for the primary by-pass tunnel, other major challenges were the extremely accelerated... Complete Project Profile

451 - Brushy Creek Sewer
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Drill and Blast	Greer, SC	Western Carolina Sewer Authority	Rock	240' x 96"Ø
	SUMMARY: Complete Project Profile

449 - Sugar Creek WWTP Tunnel
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Charlotte, NC
	SUMMARY: Complete Project Profile

443 - Route 262 CSX Crossing
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Staunton, VA	VDOT	Rock	75' x 120" Ø
	SUMMARY: Bradshaw Construction installed a 10'Ø Hand Mined Liner Plate tunnel under CSX Railroad in Staunton, Virginia. The tunnel was excavated from a portal through Boulder Fill in the embankment of the railroad. Due to the voids in the fill, a cementitious grout curtain was pumped over the tunnel alignment before mining. In order to mitigate the risks settlement and the danger of mining through... Complete Project Profile

430 - Deep River Outfall Sewer
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Drill and Blast	High Point, NC	City of High Point	Rock	1,400' x 82" - 96" Ø
	SUMMARY: This project involved the utilization of two tunneling methods: hand mine drill & blast, and a TBM capable of mining through hard rock conditions. For the most part the 1,000' TBM run was self-supporting, but some of the weaker zones required rock bolts, roof channels, and even liner-plates for a short reach. Two drill and blast road crossings totaling 400' were completed on this job. Both drill... Complete Project Profile

412 - Hillen/Ashburton Plant Bypass Pipeline
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Baltimore, MD	Baltimore City DPW	Soft Ground	50' x 108" Ø
	SUMMARY: Bradshaw hand mined 50 feet of 108 inch liner plate for a 66 inch PCCP sewer and an 8 inch DIP water main under the CSX Railroad. Ground conditions were residual soils of silts, sands and boulders and required hand mining techniques of face breasting and crown fore poling. Bradshaw also installed a 12’ x 24’ mining shaft. The key challenges were the boulder ground conditions, proximity to... Complete Project Profile

405 - MD Route 32 Bridge Replacement
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	Steel/Wood	Sykesville, MD	MD SHA	Mixed Face	60' x 66"Ø
	SUMMARY: Bradshaw Construction hand mined a 66 inch liner plate tunnel and installed a 48 inch reinforced concrete storm drain under a CSX Railroad. The removal of boulders during shaft and tunnel excavation required extreme care so as not to cause settlement of the railroad. Complete Project Profile

361 - Orme Street Combined Trunk Relief Sewer - Phase 3
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	NATM/SEM	Atlanta, GA	City of Atlanta	Mixed Face	2,300' x 14' x 16'
	SUMMARY: Bradshaw Construction Corporation built the first ever NATM tunnel that utilized compressed air in North America. The project involved the connection of two existing 7' diameter combined sewers to a new 12' diameter relief sewer. Connections were made at seven locations, along a 2,300' alignment in downtown Atlanta. The alignment was enveloped by adjacent structures and utilities. The project was... Complete Project Profile

348 - R.M. Clayton WRC Plant Expansion - Phase 3
PROJECT TYPE	SUB TYPE	LOCATION	OWNER	GEOLOGY	DIMENSIONS
Hand Tunneling	NATM/SEM	Atlanta, GA	City of Atlanta	Rock	1000' x 16 ' x 16 '
	SUMMARY: Bradshaw Construction Corporation drilled and blasted 1000' of rock, and partially weathered rock, in order to install a 12' diameter wastewater pipeline for the City of Atlanta. In order to complete this project in the most expedient manner, a "no blasting" clause in the contract was waived. With the utilization of blasting, we successfully mined through ground conditions that included coming... Complete Project Profile