Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  478 - National Center Sanitary Sewer Project

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Shaft Work Steel/Wood Crystal City, VA Arlington County Mixed Face 26'Ø x 30VF
SUMMARY: The primary jacking pit on the NCSS project was a 30' deep, 26' diameter shaft supported by steel ribs and wood lagging. The shaft was installed in primarily sandy, dry conditions with interspersed layers of hard clay. One of the main challenges involved in the shaft installation was the presence of a manhole intersecting the shaft. The manhole remained from a previous drilled shaft... Complete Project Profile

  552 - ODEC Wildcat Point Raw Water Supply

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Shaft Work Steel/Wood Peach Bottom, PA ODEC Rock 54' x 23'Ø
SUMMARY: ODEC’s Wildcat Point Generation Facility (WPGF) in Cecil County, MD will use water from the Conowingo Reservoir in Lancaster County, PA. The Wildcat Point Raw Water Supply Project, consisting of a pump house, wet well shaft and pipelines to convey water from the Susquehanna River to WPGF. The wet well shaft was constructed by Bradshaw to serve as both tunnel access and as the permanent intake... Complete Project Profile

  521 - Crabtree Basin Waste Water Conveyance Phase 1

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Shaft Work Steel/Wood Raleigh, NC City of Raleigh Mixed Face 66'x24-40 VF
SUMMARY: Phase 1 of the Crabtree Basin Wastewater improvements project consisted of 21,000 feet of 30" to 72" diameter gravity sewer pipe. Three segments were designed for trenchless construction by microtunneling. These included two road crossings and one crossing under existing 60" RCP pipeline connected to an active pump station. Bradshaw microtunneled all three crossings in rock and mixed face soil... Complete Project Profile

  432 - Irwin Creek Relief Sewers Phase 2

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Shaft Work Steel/Wood Charlotte, NC Charlotte-Mecklenburg Mixed Face 50' x 15' x 26VF & 12'-26' x 24VF-42VF
SUMMARY: Bradshaw constructed 23 shafts that were 20 to 50 feet in depth of soldier pile and wood lagging. Rib and board was used above the water table and liner plate for below. 4700 linear feet of 60-102 inch tunnels for 36 inch and 54 inch ductile iron pipe. 900-1300 linear feet included curves by tunnel boring machine with liner plate under NSR Railroad. Drill & Blast. Complete Project Profile

  505 - Piney Branch Sewer Interceptor Upgrade - Phase 1

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Shaft Work Steel/Wood Waldorf, MD Charles County Soft Ground 12'-15' x 15'-30'
SUMMARY: As part of a 1,600 linear feet microtunnel sewer project, Bradshaw installed all the 5 drive shafts. Subsurface conditions included silt, clay, and sand with the tunnels well below the ground water table. Bradshaw used interlocking steel sheeting to install the water tight shafts ranging in depth from 18 to 23 feet. The primary challenges of this project were the limited access along lengthy... Complete Project Profile

  542 - AGY-Purple Line Plymouth Tunnel Test Shaft

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Shaft Work Steel/Wood Silver Spring, MD MTA Soft Ground 12'Ø x 33VF
SUMMARY: Bradshaw installed a 12 foot diameter rib and board shaft for geotechnical exploration and observation as part of the Maryland Transportation Authority's Purple Line project. The shaft was installed to a depth of 33 feet in sand, silt & decomposed rock, and then backfilled with flowable fill after a four day observation period. Bradshaw's work was completed in 20 working days (including... Complete Project Profile

  517 - I-83 Emergency Shaft

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Shaft Work Steel/Wood Baltimore, MD Baltimore City DOT Soft Ground 24' x 24VF
SUMMARY: Bradshaw Construction made emergency point utility repairs for 15 inch and 18 inch reinforced concrete in the median of I-83 in Baltimore, MD. A 24 foot, outer diameter, shaft which encompassed an active manhole was excavated and shored with steel liner plates to a depth of 24 feet. Bradshaw's scope included excavating and installing the shaft supports, replacing the broken pipes and... Complete Project Profile

  504 - Castleton Relief Sewer Project-Phase 1

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Shaft Work Steel/Wood Indianapolis, IN Citizens Energy Group Mixed Face 16' x 20' Ø
SUMMARY: Bradshaw Construction installed 2,740 linear feet of 42 inch reinforced concrete pipe for a relief sanitary sewer by microtunneling through sand with cobbles and boulders below the groundwater table at an average depth of 20 feet. The microtunneling was accomplished in four drives, the longest of which was 810 feet. Six access shafts were constructed using steel ribs and liner plates (16 feet... Complete Project Profile

  480 - Belmont North Relief Interceptor - Section 1

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Shaft Work Steel/Wood Indianapolis, IN City of Indianapolis Mixed Face 26' to 43' Ø
SUMMARY: Bradshaw Construction installed 5,200' of 72" reinforced concrete pipe for a sanitary sewer relief interceptor. 4,000' of pipe was installed by microtunneling through sand with cobbles and boulders and glacial till below the groundwater table at an average depth of 30'. The microtunneling was accomplished in six segments, the longest being 1,150' long using three intermediate jacking stations... Complete Project Profile

  398 - US Capitol Coal Handling System

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Shaft Work Steel/Wood Washington, DC The Architect of the Capitol Soft Ground 31' x 32' x 30VF & 27' x 29' x 25VF
SUMMARY: Bradshaw installed soldier pile and wood lagging supported pits for jacking drive and receiving shafts necessary to jack 320’ x 96” RCP coal conveyor tunnel. The jacking drive shaft was 31’ x 32’ x 30’ deep and the receiving shaft was 27’ x 29’ x 25’ deep. The major challenge was installing both shafts in close proximity to the existing coal transfer plant facilities and the... Complete Project Profile

  532 - South Platte Interceptor

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Shaft Work Steel/Wood Brighton, CO MWRD Mixed Face 204' x 24.5 - 25.5VF
SUMMARY: Bradshaw Construction was contracted to mine five microtunnel crossings on Metro PAR 1088. Crossings at 168th & 160th Avenues were jacked with 96 inch steel casing. Crossings for the South Platte River & E-470 are completed and utilized 78 inch steel casing. The ground conditions consist of sand, gravel, coarse alluvium, and cobbles below the groundwater table. The scope also includes several... Complete Project Profile

  529 - McMillian Stormwater Storage

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Shaft Work Steel/Wood Washington D.C., DCW Soft Ground 57'x12-46VF
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