Amazon Blocks 26, 32, 34, and 35
Location: Seattle, WA
General Contractor: GLY (Blocks 34 & 35), Sellen Construction (Blocks 26 & 32)
Details: On the two blocks bounded by Mercer and Republican Streets and Terry and Fairview Avenues, DBM constructed both earth-retention and deep-well dewatering. The contract required the design and installation of 318 soldier piles, 574 tieback anchors and approximately 62,000 square feet of timber lagging. The dewatering wells were installed to a depth of 50- to-60 feet, which provided lowering of the ground water table by up to 28 feet from its initial level to allow completion of the mass excavation and building foundations.
On the block bounded by Terry Avenue and Boren Street, DBM installed the earth-retention system for the 12-story building with six levels of underground parking. The job required installation of 141 soldier piles, 784 tieback anchors and approximately 60,000 square feet of lagging. The unlevel site presented a number of challenges, including the variable number of tieback rows which ranged from three to eight rows. Twenty-five of the up to 90-foot-long piles provided underpinning support for existing foundations of an adjacent historical brick building that is being used during the construction phases. Even with the challenges, the earth retention was completed weeks ahead of schedule.
Good Samaritan Hospital
Location: Puyallup, WA
Owner: Good Samaritan Hospital
General Contractor: Skanska
Details: DBM completed a $3.7 million contract to build 30,000 square feet of soil nail earth retention with permanent shotcrete facing and installed 24,000 square feet of temporary soldier pile excavation support walls for the 9-story Patient Care Tower and supporting structures at MultiCare Good Samaritan Hospital in Puyallup. DBM’s portion of the project included installing approximately 900 soil nails totaling 26,000 lineal feet, 180 soldier piles totaling 5,400 lineal feet and 95 tiebacks totaling 3,400 lineal feet.
The completed facility houses 80 family-friendly private rooms, a new emergency department, state-of-the-art surgical suites, diagnostic imaging center, medical office building and a parking garage.
2020 5th Ave
Location: Seattle, WA
Owner: Lydig Construction
General Contractor: 2020 5th Ave. LLC
Details: The renovation of the two-story office building required innovative foundation design and construction concepts to achieve current City building codes and construction schedules. The renovation required demolition of the two above street level floors as well as below grade parking then building six new floors. Micropiles and soil nails proved to be key design and construction solutions for foundation support of the resulting new building structure, underpinning support of existing columns and walls remaining in place and temporary excavation support for construction of the additional below grade parking structure.
The project required DBM to install approximately 3,500 square feet of soil nail and shotcrete temporary shoring, 133-each micropiles ranging from approximately 39 foot to 54 foot depths, and temporary steel structures to support load bearing walls and columns that were underpinned to facilitate the installation of new walls and columns below. The work was performed inside the existing building, and required the use of tight access drill rigs.
Providence Sacred Heart
Location: Spokane, WA
General Contractor: Bouten Construction
Details: As part of an addition to the Providence Sacred Heart Hospital Emergency Room, DBM Contractors, Inc. recently completed installing 64 each micropile foundations. Due to the highly variable ground conditions, the micropile design and installation methods needed to be flexible to account for the conditions encountered in the field at each micropile location. Micropiles were six inches in diameter, ranged in depth from 35 feet to 45 feet and supported loads of up to 100 kips in compression and 20 kips in tension. The emergency room expansion will include 24,000 new square feet and the remodeling of more than 4,200 square feet of existing space.
Washington - Public Work
Location: Bremerton, WA
Owner: Washington State Department of Transportation
General Contractor: Manson / Mowat JV
Details: The Manette Bridge replacement required DBM to install 16 each 12-foot diameter drilled shafts up to 145 feet deep and totaling approximately 4,900 cubic yards of shaft excavation and approximately 5,700 cubic yards of shaft concrete. For 12 of the shafts access could only be provided via work barge by way of the Puget Sound waters. The remaining four shafts were constructed landside.
The existing bridge was not rated for the combined weights of ready-mix concrete trucks and a pump truck. In order to deliver concrete to the in-water shafts DBM utilized a two concrete pump truck delivery system. The system involved pushing concrete through approximately 1,000 lineal feet of slick line using one of the pump trucks located landside before reaching a second pump truck located waterside near the top of the shaft location, where concrete was placed into the drilled shaft excavation.
Green River Bridge
Location: Black Diamond/Enumclaw, WA
General Contractor: Scarsella Brothers
Details: The Green River Bridge on state Route 169 between Black Diamond and Enumclaw was span was closed in November 2008 due to unstable soil at the south approach. It took about $8 million and two phases of repairs to make the bridge safe for traffic. The first phase started in June of 2008, when engineers noticed significant soil movement. DBM Contractors installed 90 soil nails and covered the area with shotcrete as part of the interim, low-impact repair.
Heavy rains in November caused further soil movement, prompting WSDOT to close the bridge and do permanent repairs. To fix the slide problem, DBM built a 160-foot-long retaining wall that reaches as much as 90 feet down into firm bedrock. DBM drilled 57 shafts, which were filled alternately with concrete and lean concrete, and nailed the wall into the ground.
Brightwater Freeze Holes
Location: Kenmore, WA
Details: Working closely with SoilFreeze of Seattle, WA, DBM installed a ground freezing program designed to rescue a disabled tunnel boring machine(TBM) at the Brightwater Conveyance System. This project is the deepest "zone freeze" project (targeted freeze from 280' to 330' below ground surface) known to be completed in the United States.
To complete the complicated project involving a variety of soil conditions and the restricted location of the operation, DBM drilled 35 holes up to 330-feet deep and installed five-inch steel freeze-pipes for the full depth of each hole. Borehole advancement included a combination of 9 5/8”-diameter permanent steel casing, and a combination of rotary drilling with air and water flushing media to achieve the 330-foot-depth. Bentonite drilling fluid was used to maintain borehole stability while the freeze pipes were installed.
WSDOT Nalley Valley
Location: Tacoma, WA
Details: Installation of 84 each drilled shafts for support of new freeway bridges. Shaft excavations vary in diameter from 6' to 14', with primary diameter range of 8' to 10'. Shaft depths extended to a maximum of 105', with an average depth of 65'.
Location: Covington, WA
Owner: Soos Creek Water Development
Details: Install 21,000 lf of 1 m diameter secant pile excavation support : Secant piles provided shoring for 20' dia to 40' dia shafts and ranged from 65 feet to 80 feet in depth with 6500+ cy of concrete placment. Includes installation of concrete guide wall system to maintain secant pile alignment.