submerged floating tunnel ppt

7/23/2019 Submerged Floating Tunnel ppt

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SUBMERGED FLOATIN

TUNNELS


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S.ROHITH REDDY (1602029)

B.SUKUMAR REDDY (732-04)

BE 3!4-I ("I# #ASA#I "OL

ENGINEERING.


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"ONTENTS$-

Introduction

Structural components of Submerged FloatingTunnels(SFT)

Case study on a SFT: Transatlantic tunnel

Competitive features of SFT Conclusion


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The submerged oating tunnel is

which runs under the water utiliof buoyancy!

The SFT is a tube li"e structure maand Concrete !

It utilies la"es and waterways to under water and on to the other sit can be lin"ed to the rural netwounderground infrastructure of mod

%&'T IS ' S*+,-+. F/0'TI1- T11


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%hen the depth of water bodies is high ( 345 "m)

To provide route for ships

,oc"y sea beds

%hen immersed tunnels cannot be used

%&6 T0 S+ S*+,-+. F/0'TI1-T11+/22


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7,I1CI7/+:4

It wor"s using 'rchimedes8 7rinciple and /aw of Flotation!

'rchimedes8 7rinciple:4 'rchimedes9 principle indicates that the up

force that is e;erted on a body immersed in a uid$ whether fullysubmerged$ is e


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There are two ways in which SFT can be oated! Thatis positive and negative buoyancy :4

70SITI>+ 06'1C6:4

'n ob=ect that oats in the water is "nown asbeing %&'*+, /&!

In such a case SFT is ?;ed in position by anchoringeither by means of tension legs to the bottom or bymeans of pontoons on the surface!

1+-'TI>+ 06'1C6:4'n ob=ect that sin"s to the bottom isnegatively/&.

In this case the foundations would be piers orcolumns to the sea or la"e!


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ST,CT,'/ C0*701+1TS 0F SFT:4

The three basic structural components are:

Tube

'nchoring

Shore connections


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It should accommodate thetra#c lanes and the e


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'1C&0,I1-@!SFT supported on columns:

It is an Aunderwater bridgeB with foundations onthe bottom!

The ma;imum depth of the water body isupto@m


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D! SFT with pontoons:4

It is independent of water depth!

The system is sensitive to wind$ waves$ currents andships collision!


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3!SFT with tethers to the bottom :4

It is based on tethers being in tension in all futuresituations!

The present practical depths for this type of crossingmay be several hundred meters


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E!SFT unanchored:4

It has no anchoring at all e;cept at landfalls and is thindependent of depth!

There is obviously a limit to the length!

It can be used as an alternative for light tra#c (possiD meter long)


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CONNECTION TO SHORES

Connection to the shore should be able to restrain tube m

without any unsustainable increase in stresses!

The =oints must be water tight to be able to prevent entry

'dditional care in shore connections is re


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"'+ '/$-

TRANSATLANI" TUNNEL

This pro=ect is going to be most massive ande;pensive pro=ect under ta"en ever!

R&/+ :41ew 6or"4-reenland4Iceland41orway4+ngland

T/+'$-E prefabricated tunnel segmentsplaced at @Gft below sea level using pontoonships!


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A&5$-

Tethering cables

These cables would be anchored into theseaoor with the help of submersibles oranchors

T5'%&5&$-

*aglev trains

Speed:45 "mph*agnetic suspension in midair


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"HESAEAKE BAY BRIDGE TUNN

L&&$-

South4eastern >irginia Hthe .elmarva peninsular

( miles)('pril @$@GE)

A&5$-

SFT is supported on columns


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M&&5 M+558T/+,

O5+'/ B5+ T


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Invisible:4 /a"es of special beauty or perhaps

historical value should be preserved forthe future$

the crossing of such areas and la"eswith SFT may ma"e this possible

#+5 ,& 5+$- 'n SFT crossing may have a very gentle

gradient or being nearly horiontal givingconsiderable savings in energy used bytra#c!

"OMETITI#E FEATURES OF SFT


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Surface =ust above shoreline:4

'n SFT may be positioned at any depth very near the shoreline!

This may be an advantage for connections to new or e;isting road

systems It gives the planners freedom to locate connections in a very e;ibl

way

+asy removal at end of life:4'll structures will have to be removed or replaced sooner or later!

,emoval$ recycling or reuse of materials or parts of the structures inecessary in the future

SFT is in most cases a oating structure as a whole and may therefbe towed away to some place where parts of the SFT may be reuse


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@! Cost: 4 .ue to lots of material and machinery invo

pro=ect$ the cost of construction is relatively high! D! Fire: 4 It is di#cult to rescue people if ?re brea"s

tunnel!

'lso the smo"e emitted will be a problem

3! Collision: 4 If in case of collision of two trains too

is very di#cult to rescue the people! E! 1o Stoppage: 4 It is very di#cult to stop the train

travelling on such a high speed!

"HALLENGES


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It sets up new trends!

It reduces the time for travelling!eauty of landscape is maintained!

/ess energy consumption

1o air and noise pollution!

In some cases only feasible lin"!

C01C/SI01


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T&'1J 60

submerged floating tunnel ppt

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