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Bridges

Bridges (6)

Soil Reinforcement for the foundation of the Rion-Antirrion Bridge piers : Hollow large diameter steel piles.

Rion-Antirrion Bridge Photos of construction and operation.

Steel rods manufacturing for the construction of the Rion-Antirrion Bridge .

Rion-Antirrion Bridge: Views of the piers, in the dry dock, floating, in place and of their interior.

Photos of the Golden Gate Bridge , San Francisco, California, from the land and sea.

Traditional stone bridge in Andros .

Water barrier of underground garage using geosynthetics.

The Tacoma Narrows Bridge collapse : The Tacoma Narrows Bridge became famous for its dramaticwind-induced structural collapse in 1940, It is one of the most well-known cases of structural collapseandsignalled the need for a rigorous aerodynamic design of long bridges.Photos available here (select "View all items" or a specificcategory in the drop-downmenu). Videos available onYouTube: Video I

 

Water Isolation using geosynthetics for a two sub-storey parking in Patras (September 2000)

    

The photos are from a project in the city of Patras, Greece. The project consists of a two sub-storey parking below an entertainment complex. After the completion of the deep excavation, geosynthetics were used for the water isolation of the excavated area. The Geomembranes used (yellow color), are bonded together with some kind of glue. It is very important that the two parts are perfectly bonded using thermal bonding. This is a very delicate procedure since imperfections in the bonding could lead to water intrusion. Photos of the thermal bonding procedure are provided. Below are briefly described some details in the execution of thermal bonding and Construction Quality Assurance (CQA). 

 

Methods to check the quality of work 

  1. There is a very thin copper wire along the joining. This wire must not have contact with the air if the work is done properly. So at the two-ends of the wire a source (like a battery) is installed. If there is a pointwere the wire comes in contact with air, then a sparkle comes out and the spot is indicated to restore it.
  2. A pump presses air between the bonds. If the air pressure falls, this mean that in a place the textiles are not bonded perfectly. 


Materials 

In the specific site, three kind of geosynthetics were used (check the photo above) forming a "geocomposite": 

  1. In the outside, in contact with the concrete a tough plastic was used for the protection of the other two PVC (dark green) typically called Geoglass.
  2. In the middle, a white colored geotextile (Polyfond type) is used to protect the geomembrane.
  3. On the top, a geomembrane (yellow) is used as a hydraulic barrier.  

 

Bonds with heat of the textiles

            

 

Views of the Site  

   

 

Reference: 

  1. More information on the project of the deep excavation using slurry walls, are provided here.

 

Friday, 09 May 2014 13:44

Traditional Stone Bridge in Andros

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This is a picture of a bridge in Andros. The drawing, made in 1840, is of a British traveller. Even though he presumed that the bridge was constructed by the Franks, it seems to be much older, of the 17th century. 

The dimensions of the arc are:

Opening: 8,90 m.

Maximum Height: 6 m.

Width: 1.34-1.40 m.

Width of piers:  2.32-2.35 m.

 

  

 

 
Friday, 09 May 2014 13:43

Photos of the Golden Gate Bridge from Sea & Land

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The main span of the bridge is 7650ft (2331.7m). The diameter of one cable is 92.4cm and in each cable there are 27572 wires! Total wire used is 80,000 miles (128,748m) and the weight of each cable is 24500 tons (22.226m.tons).

 

Photo # 1: cross-section of the cable.

 

Collection of photos from the sea

 

Photo # 2 to the South almost below the deck

Photo # 3 to the North almost below the deck

Photo # 4 to the South

Photo # 5 to the North

 

Collection of photos from the land

 

Photo # 6 from the North towards the South

Photo # 7 from the North towards the South

Photo #8 from the deck. 

 

 
Friday, 09 May 2014 13:43

Rion-Antirrion Bridge

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Rion-Antirrion Bridge: Views of the piers, in the dry dock, floating, in place and of their interior

Photos taken in October 2001

Photos provided by G. Konstantakopoulos, N. Stathopoulos, J. Simeonoglou.

Texts by G. Konstantakopoulos 

Figure 1: View of the bridge pier, currently under construction, that is currently floating near the coast. Access to the pier is through the ship illustrated in the figure. The ship is modified to allow transportation of the reinforcements using trucks. 

 

Figure 2: Another pier of the bridge. 

Figure 3: Reinforcement placement in the pier, according to the design. The reinforcement has previously being transported with a truck next to the pier. 

Figure 4: Interior of the pier of Figure 6. The thickness of the reinforced wall is approximately 2.0m.

Figure 5: Interior of the pier. Detail of the pier wall.

Figure 6: View of the piers that are under construction close to the coasts. The right one is the one illustrated in Figure 4 and 5.

Figure 7: View of a pier that has currently touched the bottom of the sea.

Figure 8: Footing of a pier, currently under construction, in the dry dock.

Figure 9: Footing of a pier, currently under construction, in the dry dock. 

 

STEEL RODS MANUFACTURING FOR THE CONSTRUCTION OF RION -ANTIRRION BRIDGE

Photos taken in October 2001

Photos provided by G. Konstantakopoulos, N. Stathopoulos, J. Simeonoglou.

Texts by G. Konstantakopoulos 

Machine used to automate the shaping of the reinforcements in the shape required by the design. 


Machine used to automate the shaping of the reinforcements in the shape required by the design. Used for steel rods of smaller diameter. The user has specified the geometric characteristics of the steel rod. On the left you can see the steel rod which is inserted in the machine to be shaped.
 

Steel rods to be used in the above machines. A label with the barcode described the technical characteristics of the reinforcement that are going to be used to.

 

 

SOIL REINFORCEMENT FOR THE FOUNDATION OF THE RION-ANTIRRION

BRIDGE PIERS: HOLLOW LARGE DIAMETER STEEL PILES

Photos taken in October 2001

Available by the Geoengineer website

Photos provided by G. Konstantakopoulos, N. Stathopoulos, J. Simeonoglou.
Texts by G. Konstantakopoulos

 

Storage of hollow steel pipes which are installed to the ground below the footings of the piers to reinforce the ground. The diameter of the pipes is approximately 2m and their length 20-30m.