Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  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

  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

  459 - Knight Theater Tunnels

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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

  361 - Orme Street Combined Trunk Relief Sewer - Phase 3

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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