2.6 Building the World Largest High-Speed Train Arch Bridges with AP MSS
In this part , the utilization of fully autonomous MSS for building the largest HST arch bridges in the world is described – Tagus River Viaduct ( central span 324 m ) and Almonte River Viaduct ( central span 384 m ), where MSS were used for the construction of the multi-span access viaducts with spans of 60 m and 45 m respectively , and were also used to build the decks over the arches .
2.6.1 Tagus River Viaduct
The arch is a single box girder with a variable section starting with a width of 12.0 m and a height of 4m , finishing with a width of 6 m and a height of 3.5 m ( Figure 21 ).
The arch was built using form travellers . Pylons were placed on top of piers P11 and P17 to hold the cables that anchored the arch girder to the pylons and piers ( Figure 23 ).
The North access of Tagus Viaduct near Caceres ( 2015-2018 ) of 642 m has a first span of 45 m , 9 spans of 60 m and one of 57 m . The South access viaduct of 522 m has a first span of 45 m , 7 spans of 60 m and one of 57 m . Viaduct has a central zone of 6 spans of 54 m over the arch of 324 m ( Figure 22 ). Main contractor – U . T . E . Canaveral .
The deck of this viaduct is a box girder type , with an upper slab with 14 m wide and 3.6 m depth in the girder center line . The same section is used all along the Viaduct . The deck self-weight was optimized to 250 kN / m .
The concreting span was 54 m on the access viaducts and 40.5 m on the central viaduct . The construction joint of the deck was made at 1 / 4 th of the span .
2.6.1.1 Deck section – Arch section
The deck of this viaduct is a box girder type , with an upper slab 14 meters wide , and with a height of 3.6 m on the centerline of the box girder . The same section is used all along the Viaduct . The deck self-weight was optimized to 250 kN / m .
Figure 21 : Tagus Viaduct – Cross sections of the deck and of the arch
P-1 |
P-4 |
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P-2 |
P-6 |
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P-3 |
P-8 |
P-9 |
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P-5 |
P-10 |
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P-11 |
P-12 |
P-13 |
P-20 |
P-14 |
P-15 |
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P-16 |
P-17 |
P-18 |
P-21 |
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P-7 |
P-19 |
P-22 |
P-23 |
P-24 |
P-25 |
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E-1 |
E-2 |
ALZADO GENERAL
ESCALA 1:2000
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C . S . I . 5 + 560 |
E-1 |
P-1 P-2
4 + 100 4 + 200
P-3
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P-4
4 + 300
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P-5 |
P-6
4 + 400
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EJE L . A . V .
P-7 P-8 P-9 P-10 P-11 P-12 P-13 P-14 P-15 P-16 P-17 P-18 P-19 P-20
P-21 P-22 P-23
4 + 500 4 + 600
4 + 700 4 + 800 4 + 900 5 + 000 5 + 100 5 + 200 5 + 300 5 + 400 5 + 500
EJE L . A . V .
P-24
P-25
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E-2 |
AREA DE TRABAJO
AREA DE TRABAJO
C . S . D . 4 + 090
C . S . D . 4 + 090
C . S . I . 5 + 020
Figure 22 : Tagus viaduct
4 / 2017