FLOATING BRIDGE

Guided By: Presented By:

Ms. Raseena CP Anoop K

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OVER VIEW

INTRODUCTION SITE SELECTION DESIGN CRITERIA ACTION OF PONTOONS ANCHORING SYSTEM ADVANTAGES CONCLUSION REFERANCE

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INTRODUCTION

A bridge which floats on the surface of the water.

No need of piers Cables.

Supported by barge-or-boat-like pontoons.

While pontoon bridges are usually temporary structures.

Permanent floating bridges are economic construction.

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Fig.1. Floating Bridge

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SITE SELECTION For crossing large bodies of water with unusual depth. Very soft bottom where piers are impractical. For a site where the water is 2 to 5 km wide, 30 to 60 m deep and there is a very soft bottom.

DESIGN CRITERIA

It will be a long life structure & low life-cycle cost

It should meet functional, economical, and practical requirements.

Perform reliably and be comfortable to ride on under normal service conditions.

Sustain damage from accidental loads and extreme storms without sinking.

Safeguard against flooding and progressive failure.

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PONTOONS

These are the foundation for floating bridge.

Simply hollow, water light vessels.

Can be made up with even also heavy materials such as concrete.

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Fig1.1 Concrete Pontoon

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TYPES OF PONTOONS

There are two kind of pontoons are commonly used :

1. Continues pontoon (Fig. 1.1.1)

2. Separate pontoon (Fig. 1.1.2)

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Fig 1.1.1 Continues Type pontoon

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Fig. 1.1.2 Separate pontoons

ANCHORING SYSTEM

For keep the bridge stationary and stable.

Anchors with Mooring lines used for stability.

The anchors are heavy structures.

They take care about the longitudinal& transverse loads.

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Fig. 1.2 Pontoons with Anchors and Mooring lines

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There are many types of anchors there:

Eg: 1. Type A (fig. 1.2.1)2. Type B (fig. 1.2.2)3. Type C (fig. 1.2.3)3. Type D (fig. 1.2.4)

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Fig 1.2.1 Fig 1.2.2

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Fig 1.2.3 Fig 1.2.4

ADVANTAGES OF FLOATING BRIDGE

1. Cost effective 2. Easy construction3. No disturbance for Ocean biodiversity.4. Do not directly affected by ground

shakings from earthquakes.

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SAMPLES FOR FLOATING BRIDGES

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1. Ever-green Point Floating Bridge (SR 520),Seattle ( fig. 2)

2. Lacey V. Murrow Memorial Bridge, Seattle Washington

3. Floating Bridge, Dubai

4. William R Bennett Bridge, Kelowna

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Fig.2 Evergreen point floating bridge (SR 520), Washington

Supported by 21 pontoons

Each 110m long

23m wide

SR 520

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The world’s first floating cityCost : $10 billion Residential capacity : 50,000 residents,

30,000 visitors,

CONCLUSIONWe can construct any type of construction over water in future.

There is no need for conventional piers or foundations.

However, an anchoring or structural system is needed to maintain transverse and longitudinal alignments of the bridge.

A floating bridge is basically a beam on an elastic foundation and supports. Vertical loads are resisted by buoyancy.

Transverse and longitudinal loads are resisted by a system of mooring lines or structural elements.

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REFERANCE

1. Andrew, C. E., The Lake Washington pontoon bridge, Civil Eng., 9(12), 1939.

2. Lwin, M. M., Floating bridges —1993.

3. Google

4. Lwin, M. M., Bruesch, A. W., and Evans, C. F., High performance concrete for a floating bridge, in Proceedings of the Fourth International Bridge Engineering Conference, Vol. 1, Federal Highway

Administration, Washington, D.C., 1995.

5.Wikipedia

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