00:07It is the first incremental launching bridge built in Colombia for a railway system.
00:18This bridge is a very special bridge that doesn't require any kind of support.
00:27the lower part, but the base is built by successive cantilevers in equilibrium and you don't need
00:34Working in the lower part affects mobility and the whole issue of public services as such.
01:04For months, two concrete arms advanced along 26th Street until they met in a space of 3 meters.
01:11Buses and cars continued to circulate below, while the construction avoided the power lines and the underpass at one of the intersections.
01:18more complex than Bogotá.
01:19The railway bridge measures 215 meters. It is divided into two side spans of 57.5 meters and a central span of
01:27100 meters.
01:28Almost three times the usual distance between the columns of the subway viaduct.
01:33Let's remember that the metro viaduct currently under construction is between 30 and 35 meters high.
01:41light between support and support.
01:43It was necessary to design a structure that would allow for a considerable, large light, in order to pass through this entire area without needing
01:55to affect not only networks but also public transport such as Transmilenio.
02:02There's a word I use a lot for these bridges, which is balance and geometric control.
02:12at the time it is built before, at the time it is built and later.
02:17Therefore, it is important to understand that this bridge is built simultaneously on both sides of a support.
02:26We assemble the first voussoir, voussoir zero, which is the voussoir on a stack, which does need and requires gluing.
02:33to the pile some support elements to be able to make that first voussoir.
02:38But after that come some advance vehicles, some metallic structural elements that support and
02:48They perform the work simultaneously on each side of the pile, on each side of the support.
02:58Much of the structure remains hidden. The four supports rest on 26 concrete piles, with diameters of up to
03:051.8 meters.
03:07The deepest ones descend 47 meters below ground level.
03:11Above them rests a superstructure, whose own weight was calculated at more than 5,400 tons.
03:17In this particular case, it is designed for the weight of the train, which in this case per axle is
03:2417.5 tons.
03:26That's the axle load for each train, right?
03:29And they are designed so that both trains can pass simultaneously.
03:34Additionally, we must consider the impact, because remember, it is a moving train.
03:39and an additional charge is applied, which is 20% or 30%, depending on what the standard specifies,
03:47In order for that design to meet international regulatory standards, both in Colombia and in this case the project establishes that
03:57may it also be an American standard.
03:58What we're doing right now is building the walkways, which is where the staff will basically go.
04:06maintenance.
04:07These catwalks that we've already started have to be melted down.
04:12Next we will make the plinths, which are like continuous beams, with the rails on top.
04:21The rails are held in place by means of fasteners that support and anchor the rail, and with that
04:29we would practically finish executing
04:33so that the trains can begin their testing when the time comes next year.
04:38The calculation also took into account vibrations, emergency braking, temperature changes,
04:43the wear and tear caused by the repeated passage of trains and winds of up to 160 km per hour.
04:49For seismic design, soil accelerators associated with a return period of 975 years were used.
04:57We have already done an initial check of the structures.
05:02The truth is that the viaduct's behavior was adequate for this type of earthquake of the magnitude in which
05:09He was there and arrived in Bogotá.
05:12And that visual inspection allows us to determine if there are any pathologies within the construction of the subway.
05:18Today, the truth is that the results obtained from the analyses and visual inspection
05:27They do not show any type of pathologies in any of the elements of the viaduct structures as such.
05:33The bridge was designed for a lifespan of 100 years.
05:37Before trains can cross it, the footbridges, plinths, and railway track must be completed.
05:43Beneath that future route, the traffic of 26th Street and the networks that forced the construction of the new road will continue to intersect after a millennium.
05:49lift the structure from the air.
05:50Music
06:01Thanks for watching the video.
Comentarios