Site Improvement Structures

Our experience in site improvement structures includes various forms of retaining walls, detention vaults, temporary shoring and bridges. Many of these projects are performed in conjunction with our civil engineering services and structural services for the buildings on the site.

Marra Farm Park Pedestrian Bridge - Seattle, Washginton

Marra Farm Park Pedestrian Bridge DCG provided the structural engineering for a pedestrian bridge as part of the 4th Ave S and S Trenton St Storms Drainage Improvements project. The bridge was designed in accordance with the requirements of Seattle Parks and Recreation and Seattle Public Utilities.

The design of the bridge and its abutments were included as part of our civil engineering services for the 4th and Trenton project. The combination of civil and structural services delivers a coordinated product under a single contract and point of contact; simplifying the project for our clients.

Dearborn Street Townhomes Shoring - Seattle, Washington

Dearborn Street Townhomes DCG provided consulting services for three phases of this project; civil engineering for the site infrastructure, structural engineering for the five 3-story townhome buildings and engineering for the site shoring walls.

The shoring walls around the property included 275 linear feet of cantilevered steel soldier piles with timber lagging ranging in height from 3 to 18 feet tall. The design included both temporary and permanent shoring. DCG worked closely with the geotechnical engineer and contractor to ensure the wall met both the design and construction schedule requirements.

Renaissance Detention Vault - Auburn, Washington

Renaissance Detention Vault The scope of services for this project included structural engineering for the 4-story, 120-unit affordable apartment building, the 6,000 sf retail building and the two large (50’ x 150’) underground detention vaults.

The vault design incorporated pre-cast, hollow core planks over cast in place walls and footings. The design of one of the vaults was further complicated by the high water table and was designed to withstand buoyant forces.
Client: Auburn Senior Apartments, LLC, Architect: Johnson Braund Design Group

North Rocky Road Bridges - Dry Creek, Washington

Janicki Logging Bridges DCG was contracted to provide the design for four bridges supporting HS-25 traffic loading. These bridges were to replace existing undersized culverts and were to accommodate 100 year flows and to provide capacity for debris passage.

The stream beds were designed to provide protection from the high water velocity from the steep mountain gradient. The bridge was designed to be modular and consisted of three pre-cast concrete sections: the bridge deck, abutments and tie back anchors. The final design melded together both a time and cost effective solution for the client.
Client: Janicki Logging, Inc.