William R. Bennett Bridge. W.R. Bennett Bridge, Kelowna, B.C. Canada. July 2005 to December 2008

Transcription

1 William R. Bennett Bridge W.R. Bennett Bridge, Kelowna, B.C. Canada. July 2005 to December 2008

2 Contract Details Scope: Design & Build the new W.R. Bennett Floating Bridge & Decommission existing Okanagan Lake Floating Bridge (built in 1956) Duration: July 2005 to December 2008 (3.5 years) Location: Okanagan Lake, Kelowna, BC, Canada. Owner: B.C. Ministry of Transportation Type: Public Private Partnership (3P) General Contractor: WRB Bridge Group JV between SNC Lavalin & CMIR Holdings OK Bridge PT Sub Contractor: Harris Rebar / Harris PT. Project Engineers: Buckland and Taylor. Contract Value: $145 Million CND

3 W.R. Bennett Bridge Facts: 1 of 8 Floating Bridges in the World Total Bridge Length is 1.0 km Floating Pontoon Length is 0.7 km 5 Piers supporting the fixed structure Graving Dock installed on lake 9 Floating Concrete Pontoon Sections Navigation Span for sail boats. 5 Piers (steel piles w/ concrete caps)

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6 The Graving Dock Graving Dock is a facility used for building floating structures (ie. concrete pontoons) Essentially a large dewatered hole in the ground with a large gate to the lake The final Graving Dock dimensions were 100m long x 30m wide x 7m deep(330 ft x 100 ft x 23 ft) The base slab had tubes running through it, used for heating and cooling the slab during construction. The lake level varies approximately 2 feet over a year. Maximum water depth in Graving Dock is 13 ft.

7 The Graving Dock

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9 Construction Challenges Accelerated schedule to design / build the graving dock Shutdown by Natives due to discovery of bones (animal bones) on site (3 month delay) Working during extreme hot and cold temperatures (40deg C to -20deg. C) with high winds. Graving Dock length extended after 5 months from 65m to 100m to Accelerate Schedule and lengthen the pontoons from 200ft to 300ft. Narrow heavily congested site.

10 The Graving Dock, 100m

11 The Pontoons All pontoons had : 42-7/0.6 tendons in the base slab. 6-7/0.6 tendons in each long external walls 35-5/0.6 tendons in the upper deck slab (Road way) /0.6 tendons in each connection point.

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13 Building The Pontoons Average length of 300ft. heights 15ft to 18 ft. Average width 75ft. Longitudinal / transverse walls (Cells were 15ft x 15ft x 18ft). Continuous pours for both the top and bottom PT slabs.

14 Post tensioning the Pontoons 9 Pontoons over 2 years Lengths ranged from 100ft to 300ft long, with 6 of the pontoons at 300ft 2 at 200ft and 1 at 100ft. Post tensioning was used to compress the concrete in the longitudinal direction for the entire length. 1.3 million feet (246 miles) of.6 270ksi Domestic Canadian strand was used. Pt strand was used to make the connection on site.

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16 Preparations for winching tendons into the structure.

17 Connections

18 Design details for the connections

19 The original designed used a 44mm radius, high grade Threaded bars. Each bar was replaced with a 7 strand, Bonded PT Tendons. Resulting in over 8,120pcs of.6 strands being installed and tensioned 1 at a time Making a Change

20 Stressing details for the connections

21 Making the connections There were 8 connections. 145pcs. 7/0.6 tendons each. 12 temporary bar connections

22 Stressing equipment went from a 485lbs ram to a 49lbs 30to aluminum ram.

23 Installing the Pontoons

24 Making the connections

25 Sealing the Joint

26 Grouting the connections

27 Making the connections

28 Making the connections

29 Strand installation

30 Tensioning the connections

31 Completed connections

32 Completed connections

33 Anchoring the Pontoons.

34 Large pumps were used to position anchors into the Lake bed. Using jet pumps

35 Anchors positioning.

36 Anchoring the Pontoons.

37 Adjusting the anchors.

38 Connecting BC s Wine Country.