The 43-acre Terminal 30 Upgrade project included relocation of the Cruise Ship operation, and returning the terminal to its original function as a container terminal. General's contract was to strengthen the existing concrete wharf in preparation to receive new container cranes. The 1,545 LF dock was upgraded using 166 new concrete piles that support a new waterside crane rail beam. In addition a 1,417 LF sheet pile wall and concrete cap were constructed to support the landside crane rail beam. Approximately, 59,000 cubic yards of material was clam shell dredged to provide -50 feet MLLW throughout the berth.
The project required the demolition of approximately 850,000 sq ft of existing concrete piers. 2.3 million cu yd of clamshell and hydraulic dredging were required and 390,000-tons of rock fill and riprap was placed. 125,000 sq ft of dynamic compaction was required and 1.4 million lin ft of wick drains were installed. The 2,400 lin ft reinforced concrete marginal wharf was constructed on 1,600, 24 in. concrete piling, totaling 116,000 lin ft. The project also required crane rails, drainage, water and electrical service. Paving stones and asphalt concrete finish the back land area.
The project included the demolition of the existing timber apron and removal of the associated creosote treated supporting piles. The new dock is comprised of concrete piles, sheet piles, a new bulkhead, battered steel pipe piling, augercast piles and micropiles, concrete caps, concrete decking, steel fender piling and a fender system. Additional riprap, rat rock and other capping materials were added below the apron slope cover. General also installed a ships water line, a catch basin with associated storm sewer piping, a new ships electrical system, security fencing, and a new light pole.
The first 1,200 ft of pipe was installed on the beach with conventional land equipment from behind the Kingston Marina out to the zero tide mark. The next 500 ft was laid and backfilled one joint at a time during high tides from a derrick barge offshore. The next 2,200 ft was installed and backfilled in a pre-excavated 6-9 ft ditch in 96 ft sections. The ditch was backfilled first with gravel and quarry spalls, then native material previously removed. The final 1,400 ft was laid directly on the bottom out to a set of diffusers at -170 MLLW. All underwater connections were made with divers. At the outer end of the outfall a four-diver crew was required, with each diver only having 14 minutes of bottom time due to the depth.
This project required construction of a steel intake pier 450 ft into an active drinking water reservoir. Our work included 500-tons of fabricated steel supported by 22 piles in four piers. The 175 ton, 50 x 100 ft pump platform was assembled in place before lowering 20 ft and driving piles. In completed form it has steel walls and floor, slide gates, a jib crane and 8 pumps manifold to twin 6 ft pipes back to the beach. The work required a trestle, sheet cell, sectional barges with a 165-ton crane and extensive silt curtains.
he initial 285 ft of pipe was installed through a jacked and bored casing installed by a subcontractor. This runs from the Des Moines Beach Park, under a hill, and out the upper portion of the beach. The next 600 ft were installed at low tides with an excavator in a sheet pile trench. All work was performed on non-floatable mats to protect the beach. The next 400 ft of pipe going offshore was installed by divers and a derrick barge in an excavated trench with sheet pile to protect the eel grass. Past the sheet pile, the pipe continues in an excavated trench for 200 ft then daylights and was set on the bottom out to the station 21+00. Precast anchors were set over the unburied section of pipe.
The project began with the relocation of approximately 1,000 sq ft of eelgrass. Then a 250ft long by 50 ft wide trench was dug. Serving as a foundation for the diffuser, three, 4 ft by 12 ft articulated concrete ballast mats were placed at in 55 ft of water in Puget Sound. The 620 ft. long, 54 inch HDPE outfall pipe was sealed at each end and pulled from the beach into the water. While it was floating, 23 concrete weights were attached. Each weight was over 15,000 pounds. After attaching the onshore end to its tie-in point, we used controlled submergence to sink the pipe into the trench and onto the mats. Finally the trench was backfilled and the beach was restored to its previous appearance.
This project consisted of demolishing the existing transfer span, apron, headframe, towers, tower foundations, trestle walkway and bridge seat for Slip 2. A new trestle consisting of precast prestressed deck units, precast pile caps and bridge seat was installed as well as hydraulic actuated transfer span, apron and lift cylinder shafts. Steel piles, a concrete trestle and a hoisting mechanism were also fabricated and installed.
This project was a joint venture with WPC, Inc. General Construction's scope of work included widening the existing pier with a new 543 ft x 35 ft pier addition, partial demolition, breakwater extension, approach trestle addition, mooring dolphins, mooring camels, hydraulically operated power booms, mooring fittings, mechanical and electrical systems and a pier fender system. WPC, Inc. constructed a two-story office building on steel piles, an addition to an existing building, and a new storage facility.
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33455 6th Avenue South
Federal Way, WA 98003
Tel: (253) 943-4200
Fax: (253) 943-4021