Cantilever bridge: Difference between revisions

Revision as of 02:45, 11 December 2024

Cantilever bridge

  [[File:File:File:Tibetan log bridge.JPG|frameless|alt=]]

A traditional Tibetan log cantilever bridge

A cantilever bridge is a type of bridge that is constructed using cantilevers, which are structures that project horizontally into space, supported on only one end. This design allows for bridges to span large distances without the need for support piers in the middle of the span, making them ideal for crossing wide rivers or valleys.

Design and Construction

Cantilever bridges are typically constructed using a combination of steel and concrete, although traditional materials such as wood can also be used, as seen in the

. The basic principle involves two arms extending from opposite sides of the obstacle to be crossed, meeting in the middle. These arms are anchored at the ends and are balanced by counterweights. The

illustrates how the cantilever principle works, with the arms extending outwards and being supported at only one end.

Examples of Cantilever Bridges

One of the most famous examples of a cantilever bridge is the Forth Bridge in Scotland, which was completed in 1890 and spans the Firth of Forth. Another notable example is the Quebec Bridge in Canada, which is the longest cantilever bridge span in the world.

The

shows the structural design of a typical cantilever bridge, highlighting the cantilever arms and the central span.

Advantages and Disadvantages

Cantilever bridges offer several advantages:

They can span long distances without the need for central supports.
They are stable and can support heavy loads.
They allow for construction over difficult terrain or water without the need for temporary supports.

However, they also have some disadvantages:

They require careful engineering and design to ensure stability.
They can be more expensive to build than other types of bridges due to the complexity of the design.

Dismantling and Maintenance

Cantilever bridges, like all bridges, require regular maintenance to ensure their safety and longevity. The

Dismantling of the old East Span of the San Francisco-Oakland Bay Bridge

shows the process of dismantling a cantilever bridge, which involves carefully removing the cantilever arms and central span.

Also see

Template:Bridge types

@@ Line 1: / Line 1: @@
-=== CANTILEVER FIXED PARTIAL DENTURES ===
+{{Infobox bridge
-A cantilever fixed partial denture is used when support can be obtained only from one side of the edentulous space. These dentures have compromised support. The abutment teeth on the supporting side should be strong enough to withstand the additional torsional forces. Support can be obtained from more than one tooth on the same side of the edentulous space.
+| name = Cantilever Bridge
-==== Advantages ====
+| image = File:Tibetan log bridge.JPG
-* Very conservative design especially when a single abutment is involved.
+| caption = A traditional Tibetan log cantilever bridge
-* When secondary abutments are used, parallel preparation can be easily obtained because the abutments are adjacent to one another.
+| carries = Pedestrians, vehicles, rail
-* Easy to fabricate.
+| design = Cantilever
-==== Disadvantages ====
+| material = Steel, concrete, wood
-* Produces torquing forces on the abutment.
+| span = Varies
-* Cannot be used to restore long span edentulous spaces.
+}}
-* Minor design errors can affect the abutments in a large scale.
-<youtube>
-title='''Documentary Film - {{PAGENAME}}'''
-movie_url=http://www.youtube.com/v/IBaNoAuNqpY
-&rel=1
-embed_source_url=http://www.youtube.com/v/IBaNoAuNqpY
-&rel=1
-wrap = yes
-width=750
-height=600
-</youtube>
-=== SPRING CANTILEVER FIXED PARTIAL DENTURES ===
+A '''cantilever bridge''' is a type of [[bridge]] that is constructed using cantilevers, which are structures that project horizontally into space, supported on only one end. This design allows for bridges to span large distances without the need for support piers in the middle of the span, making them ideal for crossing wide rivers or valleys.
-This is a special cantilever bridge exclusively designed for replacing maxillary incisors but these dentures can support only a single pontic. Support is obtained from posterior abutments (usually a single molar or a pair of splinted premolars). A long resilient bar connector is used to connect the posterior retainer to the anterior.
-==== Advantages ====
-* Can be used for diastema cases.
-* Metal crown retainers that require minimal tooth preparation, can be used in posterior teeth to replace missing incisors.
-==== Disadvantages ====
-* The connector bar may interfere with speech and mastication
-* Deformation of the connector bar may produce coronal displacement of the pontic.
-* There may be food entrapment under the connector bar, which may lead to tissue hyperplasia.
-<youtube>
-title='''Documentary Film - {{PAGENAME}}'''
-movie_url=http://www.youtube.com/v/TUAcaxWoi1Y
-&rel=1
-embed_source_url=http://www.youtube.com/v/TUAcaxWoi1Y
-&rel=1
-wrap = yes
-width=750
-height=600
-</youtube>
-{{stub}}
+==Design and Construction==
-{{dictionary-stub1}}
+Cantilever bridges are typically constructed using a combination of [[steel]] and [[concrete]], although traditional materials such as wood can also be used, as seen in the [[File:Tibetan log bridge.JPG|thumb|right|A traditional Tibetan log cantilever bridge]]. The basic principle involves two arms extending from opposite sides of the obstacle to be crossed, meeting in the middle. These arms are anchored at the ends and are balanced by counterweights.
+The [[File:Cantilever bridge human model.jpg|thumb|right|A human model demonstrating the cantilever principle]] illustrates how the cantilever principle works, with the arms extending outwards and being supported at only one end.
+==Examples of Cantilever Bridges==
+One of the most famous examples of a cantilever bridge is the [[Forth Bridge]] in Scotland, which was completed in 1890 and spans the Firth of Forth. Another notable example is the [[Quebec Bridge]] in Canada, which is the longest cantilever bridge span in the world.
+The [[File:CooperRiverBridge.svg|thumb|right|Diagram of a cantilever bridge]] shows the structural design of a typical cantilever bridge, highlighting the cantilever arms and the central span.
+==Advantages and Disadvantages==
+Cantilever bridges offer several advantages:
+* They can span long distances without the need for central supports.
+* They are stable and can support heavy loads.
+* They allow for construction over difficult terrain or water without the need for temporary supports.
+However, they also have some disadvantages:
+* They require careful engineering and design to ensure stability.
+* They can be more expensive to build than other types of bridges due to the complexity of the design.
+==Dismantling and Maintenance==
+Cantilever bridges, like all bridges, require regular maintenance to ensure their safety and longevity. The [[File:SFOBB-OldEastSpanDismantleCropped.png|thumb|right|Dismantling of the old East Span of the San Francisco-Oakland Bay Bridge]] shows the process of dismantling a cantilever bridge, which involves carefully removing the cantilever arms and central span.
+==Also see==
+* [[Beam bridge]]
+* [[Arch bridge]]
+* [[Suspension bridge]]
+* [[Truss bridge]]
+{{Bridge types}}
+[[Category:Bridge types]]
+[[Category:Cantilever bridges]]