The document discusses different types of tunnels used for transportation, including those resting on the sea bed, floating in the sea, and tunnels dug below the sea bed. It focuses on submerged floating tunnels, which are tube-like structures that float underwater at a certain depth, fixed by cables. This allows tunnels to be constructed in extremely deep waters where conventional bridges or tunnels are not feasible. The document outlines the principles behind submerged floating tunnels and describes their construction process which involves building segments on dry dock and joining them together underwater. Examples of significant tunnels discussed include the Channel Tunnel between Britain and France, and the Seikan Tunnel in Japan. Tunnel boring machines are also described as the method used to excavate underwater and below sea bed tunnels
Submerged Floating Tunnel by Shantanu PatilShantanu Patil
Tunnels in water are by no means new in civil engineering. Since about 1900, more then 100 immersed tunnels have been constructed. Bridges are the most common structures used for crossing water bodies. In some cases immersed tunnels also used which run beneath the sea or river bed. But when the bed is too rocky ,too deep or too undulating submerged floating tunnels are used .
The Submerged Floating Tunnel concept was first conceived at the beginning of the century, but no actual project was undertaken until recently. As the needs of society for regional growth and the protection of the environment have assumed increased importance, in this wider context the submerged floating tunnel offers new opportunities. The submerged floating tunnel is an innovative concept for crossing waterways, utilizing the law of buoyancy to support the structure at a moderate and convenient depth .The Submerged floating Tunnel is a tube like structure made of Steel and Concrete utilizing the law of buoyancy .It supported on columns or held in place by tethers attached to the sea floor or by pontoons floating on the surface. The Submerged floating tunnel utilizes lakes and waterways to carry traffic under water and on to the other side, where it can be conveniently linked to the rural network or to the underground infrastructure of modern cities.
The concept of submerged floating tunnels is based on well-known technology applied to floating bridges and offshore structures, but the construction is mostly similar to that of immersed tunnels: One way is to build the tube in sections in a dry dock; then float these to the construction site and sink them into place, while sealed; and, when the sections are fixed to each other, the seals are broken. Another possibility is to build the sections unsealed, and after welding them together, pump the water out.
The ballast used is calculated so that the structure has approximate hydrostatic equilibrium (that is, the tunnel is roughly the same overall density as water), whereas immersed tube tunnels are ballasted more to weight them down to the sea bed. This, of course, means that a submerged floating tunnel must be anchored to the ground or to the water surface to keep it in place (which of these depends on which side of the equilibrium point the tunnel is)
Submerged Floating Tunnel by Shantanu PatilShantanu Patil
Tunnels in water are by no means new in civil engineering. Since about 1900, more then 100 immersed tunnels have been constructed. Bridges are the most common structures used for crossing water bodies. In some cases immersed tunnels also used which run beneath the sea or river bed. But when the bed is too rocky ,too deep or too undulating submerged floating tunnels are used .
The Submerged Floating Tunnel concept was first conceived at the beginning of the century, but no actual project was undertaken until recently. As the needs of society for regional growth and the protection of the environment have assumed increased importance, in this wider context the submerged floating tunnel offers new opportunities. The submerged floating tunnel is an innovative concept for crossing waterways, utilizing the law of buoyancy to support the structure at a moderate and convenient depth .The Submerged floating Tunnel is a tube like structure made of Steel and Concrete utilizing the law of buoyancy .It supported on columns or held in place by tethers attached to the sea floor or by pontoons floating on the surface. The Submerged floating tunnel utilizes lakes and waterways to carry traffic under water and on to the other side, where it can be conveniently linked to the rural network or to the underground infrastructure of modern cities.
The concept of submerged floating tunnels is based on well-known technology applied to floating bridges and offshore structures, but the construction is mostly similar to that of immersed tunnels: One way is to build the tube in sections in a dry dock; then float these to the construction site and sink them into place, while sealed; and, when the sections are fixed to each other, the seals are broken. Another possibility is to build the sections unsealed, and after welding them together, pump the water out.
The ballast used is calculated so that the structure has approximate hydrostatic equilibrium (that is, the tunnel is roughly the same overall density as water), whereas immersed tube tunnels are ballasted more to weight them down to the sea bed. This, of course, means that a submerged floating tunnel must be anchored to the ground or to the water surface to keep it in place (which of these depends on which side of the equilibrium point the tunnel is)
Connecting opposite shores of a lake, sea or river, has always been one of
the major tasks to be faced by Civil Engineering, it being a fundamental need
for the development of the areas surrounding a waterway. Nowadays, this
issue is still topical and of great importance, as it is proved by the numerous
large infrastructures which have been built or planned to be built in the last
years all over the world, such as, for instance the Channel Tunnel, linking the
shores of France with the ones of the United Kingdom, the Immersed Tunnel
under construction in the Bosporus Strait (Turkey) or the Suspension Bridge
designed to connect Calabria and Sicily in the Messina Strait (Italy).
Numerous other important and noticeable cases could be mentioned, however
the aforementioned ones probably represent the most advanced examples of
the structural solutions which are traditionally most widely used to link areas
divided by the presence of waterways: Cable Supported Bridges (i.e.
Suspension or Cable stayed Bridges), Underground Tunnels and Immersed
Tunnels.
An underwater tunnel is a passage, gallery, or roadway beneath a body of water. Underwater tunnels are used for highway traffic, railroads, and subways; to transport water, sewage, oil, and gas; to divert rivers around dam sites while the dam is being built; and for military and civil defence purposes.
Modern underwater tunnelling begins by constructing an immersed tube within a pre-dug trench on the river or sea floor. To do this, pre-fabricated sections of steel tube are floated into position and strategically sunk into the trench.
The complexity of the design issues related to these classic technological solutions, increases as the distance to be covered grows up, so that the
crossing of long span waterways can be, in many cases, very difficult and
sometimes impossible. Moreover, the traditional systems feature some
disadvantages which in some cases are of great importance, leading to the
necessity to find alternative technical solutions.
Tube like structure made up from steel & concrete under water bodies called submerged Floating Tunnel. Advantages of this structure is less energy consumption, reduces air & noise pollution. This structure is under the water so ships can easily pass over it.
Tunnels in water are by no means new in civil engineering.
Since about 1900, more then 100 immersed tunnels have been constructed.
Bridges are the most common structures used for crossing water bodies.
In some cases immersed tunnels also used which run beneath the sea or river bed.
This is a ppt on tunneling safety for 2-4. There are lots of tunnels and the OSHA rules are 45 years old. These are the issues I would consider. I need to fine tune this later. John Newquist johnanewquist@gmail.com
A Review Study on Methods of Tunneling in Hard Rocksijsrd.com
This article presents a review on the different methodologies that are used for tunnels excavations in hard rocks in present era. Growing needs for modern transportation and utility networks have increased the demand for a more extensive and elaborate use of underground space or through high mountains / hills. As a result, more projects have to be completed in various ground conditions and one of which is more challenging is to carry out excavation work in hard rocks. Significant technological advances have rendered these projects possible, but have also given rise to new challenges as many of these projects have to be completed in difficult conditions, with very strict environmental constraints, particularly in urban areas where the potential impact of tunneling on existing structures is a major concern. This paper addresses the main aspects of tunneling and underground works performed in hard rocks. A summary is presented of the more recent advances and widely adopted techniques in these regards.
Connecting opposite shores of a lake, sea or river, has always been one of
the major tasks to be faced by Civil Engineering, it being a fundamental need
for the development of the areas surrounding a waterway. Nowadays, this
issue is still topical and of great importance, as it is proved by the numerous
large infrastructures which have been built or planned to be built in the last
years all over the world, such as, for instance the Channel Tunnel, linking the
shores of France with the ones of the United Kingdom, the Immersed Tunnel
under construction in the Bosporus Strait (Turkey) or the Suspension Bridge
designed to connect Calabria and Sicily in the Messina Strait (Italy).
Numerous other important and noticeable cases could be mentioned, however
the aforementioned ones probably represent the most advanced examples of
the structural solutions which are traditionally most widely used to link areas
divided by the presence of waterways: Cable Supported Bridges (i.e.
Suspension or Cable stayed Bridges), Underground Tunnels and Immersed
Tunnels.
An underwater tunnel is a passage, gallery, or roadway beneath a body of water. Underwater tunnels are used for highway traffic, railroads, and subways; to transport water, sewage, oil, and gas; to divert rivers around dam sites while the dam is being built; and for military and civil defence purposes.
Modern underwater tunnelling begins by constructing an immersed tube within a pre-dug trench on the river or sea floor. To do this, pre-fabricated sections of steel tube are floated into position and strategically sunk into the trench.
The complexity of the design issues related to these classic technological solutions, increases as the distance to be covered grows up, so that the
crossing of long span waterways can be, in many cases, very difficult and
sometimes impossible. Moreover, the traditional systems feature some
disadvantages which in some cases are of great importance, leading to the
necessity to find alternative technical solutions.
Tube like structure made up from steel & concrete under water bodies called submerged Floating Tunnel. Advantages of this structure is less energy consumption, reduces air & noise pollution. This structure is under the water so ships can easily pass over it.
Tunnels in water are by no means new in civil engineering.
Since about 1900, more then 100 immersed tunnels have been constructed.
Bridges are the most common structures used for crossing water bodies.
In some cases immersed tunnels also used which run beneath the sea or river bed.
This is a ppt on tunneling safety for 2-4. There are lots of tunnels and the OSHA rules are 45 years old. These are the issues I would consider. I need to fine tune this later. John Newquist johnanewquist@gmail.com
A Review Study on Methods of Tunneling in Hard Rocksijsrd.com
This article presents a review on the different methodologies that are used for tunnels excavations in hard rocks in present era. Growing needs for modern transportation and utility networks have increased the demand for a more extensive and elaborate use of underground space or through high mountains / hills. As a result, more projects have to be completed in various ground conditions and one of which is more challenging is to carry out excavation work in hard rocks. Significant technological advances have rendered these projects possible, but have also given rise to new challenges as many of these projects have to be completed in difficult conditions, with very strict environmental constraints, particularly in urban areas where the potential impact of tunneling on existing structures is a major concern. This paper addresses the main aspects of tunneling and underground works performed in hard rocks. A summary is presented of the more recent advances and widely adopted techniques in these regards.
Seminar for Tunneling & Compressed Air Workers Delhi Metro 2014apollohyperbaric
There is significant increase in metro tunneling, underwater piping and similar projects in India where workers are involved in a compressed air environment. These workers are exposed to health hazards if compressed air work is not managed properly.
This presentation will highlight various risk factors and the approach to prevent and manage compressed air works as per the relevant prevailing guidelines.
Konferencijos "Transporto infrastruktūros inovacijos 2015" pranešimas "Immersed Tunnels Recent developments", autorius René Zijlstra, Royal HaskoningDHV.
A submerged floating tunnel, also known as submerged floating tube bridge, suspended tunnel, or Archimedes bridge, is a proposed design for a tunnel that floats in water, supported by its buoyancy. The tube would be placed underwater, deep enough to avoid water traffic and weather, but not so deep that high water pressure needs to be dealt with—usually 20–50 m is sufficient. Cables either anchored to the Earth or to pontoons at the surface would prevent it from floating to the surface or ...
interesting civil engineering topics
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Immersed tube tunnel is an alternative to bridges and bored tunnels for the crossing of harbors/rivers. Different strategies were considered for the construction of the immersed tunnels in India from different projects around the world during the project.
Necessity/advantage of a tunnel, Classification of Tunnels,
Size and shape of a tunnel, Alignment of a Tunnel, Portals and Shafts,
Methods of Tunneling in Hard Rock and Soft ground, Mucking, Lighting
and Ventilation in tunnel, Dust control, Drainage of tunnels, Safety in
tunnel construction.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Governing Equations for Fundamental Aerodynamics_Anderson2010.pdf
Tunneling
1. TUNNELING
TYPES OF TUNNELS & ADVANCED
METHODS USED FOR DIGGING THE
VARIOUS TUNNELS
BY
JAGDISH R. LAWADIYA
2. INDEX
1) Introductiion about tunneling
2) Types of tunnels
a) Rested on the sea bed
b) Floating in the sea
c) Tunnels through the earth /below
sea
bed
3) Need
4) How it is constructed
5) Channel Tunnel
5. What is
submerged
floating
tunnel……???
Submerged floating tunnel is basically
making a tunnel to float underwater
which is balanced by its buoyancy, self
weight and constraint forces resulted
from cable system and thus submerged
to a certain depth underwater.
It is basically tube like structure
floating at some depth below water
surface and fixed against excessive
movements. The tube is designed to
accommodate road and or rail traffic
6. NEED FOR SUBMERGED
FLOATING TUNNEL
A “SFT” is considered when the
depth of sea or ocean is too deep so
that no tunnel or any solid body
could sustain the pressure acting on
it at such a deep level.
In that case the tunnel is lifted up
such as about 30 to 100m deep from
the sea surface where the water
pressure is comparatively lower than
what is at the bottom depth.
7. Why floating tunnels ?????
In the more seismic zones,pier or cassion type
constructions of bridges gets collapsed.
Also the submerged or underground tunnels
may also get damaged due to the
earthquakes.
So the floating tunnel is an solution which
would not damage that much compared to
the other types bridges or tunnels.
8. Seismic zone where so many
suggestios were given to
build some floating
tunnels.
9. PRINCIPLE
Any object wholly or partially immersed in an
fluid, is buoyed up by a force equal to the weight
of the fluid displaced by the object.
this means if more surface area exposed to water
surface more are the chances of floating it.
Ships, submarines, offshore oil rigs etc. work on
this principle.
Research shows that the buoyancy to weight
ratio for the tunnel to float should be less than
one and between 0.5 to 0.8
10. Advantages of “S.F.T.”
Allows construction of tunnel in extremely deep water,
where conventional bridges or tunnels are technically
difficult or prohibitively expensive.
Construction activities has less harmful effects on
aquatic life.
No harmful environmental effects such as fog or storm
since the whole structure is covered and is present
inside the water.
11. Step by step
procedure...!!!!
1) Construction of tunnel segments on
dry dock.
2) Transporting the tunnel segments to
their final places and placing them
over their successive positions.
3) Joining of different tunnel segments
by using rubber gasket.
4) Anchoring the tunnel to the cables.
12. TUNNELS RESTING ON THE SEA
BED
The owesome example of this type of tunnel
is in between Busan and Korea.
First the precast concrete columns of high
grade were placed and a path was made over
which the casted tunnel members are gonna
be placed.
13. How this is constructed…….
A trench is dredged in the bed of the water channel.
DREDGING
Dredging technology has
improved considerably in
recent years, and it is now
possible to remove a wide
variety of material underwater
without adverse effects on the
environment of the waterway.
15. Tunnel elements are constructed in the dry, for example in a casting basin, aTunnel elements are constructed in the dry, for example in a casting basin, a
fabrication yard, on a ship-lift platform or in a factory unit.fabrication yard, on a ship-lift platform or in a factory unit.
casting basin fabrication yard
ship-lift platform factory unit
16. After Casting…..After Casting…..
∗ After casting the ends of the element are then temporarily sealed
with bulkheads.
∗ Each tunnel element is transported to the tunnel site - usually
floating, occasionally on a barge, or assisted by cranes.
17. The immersion of the tunnel element is carried out after
the tunnel element has been moved and the element
has been ballasted as necessary to provide adequate
loads in the immersion tackles.
21. Tunnel through earth or below sea
bed
A tunnel constructed below the sea bed by using
TBM.
Under sea bed or below earth tunnel is a tube
like structure but of much bigger dia than the
usual tunnels.
These tunnels are digged by using the giant
shaped TUNNEL BORING MECHINES.
The channel tunnel between britain and france.
Also,seikan tunnel at japan is an another
example of this type.
22. The rail between ENGLAND &
FRANCE world's longest undersea
portion railway tunnel
24. TUNNEL BORING MECHINE(TBM)
First successful TBM mechine was built by
henri joseph.
The shape of TBM is circular and its weight is
about the weight of 12 AIRCRAFTS.
TBMs are also known as mole and these are
used to dig soil and stones beneath the earth.
The diameter of the cutting core ranges from
1 to 19.25 meters.
25. This is oneTBM which is being carried to the site.
Due to gaint structure of the mechine,it is assembled
at the site,itself where it is actully needed.
26. WORKING OF TBM
The core ofTBM is circular in shape and it rotates
contineously .
The disc cutters are mounted at the head of cutting core
which produces compressive stress ,which causes
fractures in the rocks.
The excavated stones are then transferred to the
conveyer belt at the back of the cutting core.
Total 8 segments are present over these segments cores
and drill holes are mounted.
One complete rotation of the core of TBM excavates
about 2-4 tonnes of the stones,and this depends upon
the type of strata
28. while rotating it not only digs but also constructs
the inner lining of the tunnel.
The inner lining of the tunnel is composed of pre-
casted curved concrete structures made up from
highly graded concrete.
Each segment contains about 300 kg of steel
reinforced bars for the strength of the cast
members.
30. Channel Tunnel
I t is t he one of t he wonders of t he
modern world.
I t is const ruct ed bet ween Brit ain and
France and needed 7 years t o
complet e t he const ruct ion work.
I t is 34 km long and digged below t he
sea bed about 100 met res dept h
Agreement t o const ruct such a t unnel
was passed at 1986 and as est imat ed
it s cost was about 4.5 t o 5 billion
pounds
31. As per the estimation the tunnel was gonna be
the BIGGEST DIGGED TUNNEL in the
world,everyone on the site were feeling too
much proud to work over such a
realistic,huge,and terrific project.
The actual work of biggest dig started at
december 1987
They were needing three TBMs to construct
the mega chaannel tunnel.
Two main tunnels for the transport of the
supersonic trains and one middle service tunnel
for the maintanance
32.
33. Construction of channel
tunnel
The excavation was started from both
sides,i.e. both france and britain started to
dig the strata 100 metres below the sea bed.
It was just a kind of race for both of them,for
contineous and straight digging they
followed the TBMs laser guidening system.
It is much more imaginary method first
successfully used by britishans
35. Difficulties faced
1) First major difficulty they faced was the
leakage of water inside the tunnel.
2) Second was the technical fault inside the
TBMs and they stopped working
3) Third one was not while construction but it
was after the completion of the project,the
fire occurred inside the tunnel
36. TBMs laser guidening system
In this method,the lasers
rotate contineouslyand
shows the actual
positoning of theTBM and
shows where actully it
should be.
Just like this
37. ADVANTAGES
The bridges allow shiping may cause traffic
congestion so tunnel will allow shipping to
pass without any disturbance.
The downward ramp leading to tunnel leaves
smaller footprints compared to the ramp
required for bridges.
Tunnling will generate soil that has ben
excavated and used to create new land.
38. Tunnels required for higher costs of security and
construction than bridges. This may mean that over short
distances bridges may be preferred rather than tunnels
(for example Dartford Crossing).
Bridges may not allow shipping to pass, so solutions such
as the Oresund Bridge have been constructed.
Implementation of this project is very tough & requiring
skilled labours & heavy machinery & facing very adverse
situations.
39. SOME EXTRA ORDINARY TUNNELS
Smart tunnel in malasia
Channel tunnel between france and britain