PFor security, Metro Line 12 ought to not resume operations in its underground or elevated part.
The Structural Security Technical Committee of the Colegio de Ingenieros Civiles de México, AC inspected the elevated viaduct between the Culhuacán station and floor zero, and from there to the Tlaltenco station. Though the brigades did not detect grade A affectations, that is, with a threat of fast instability, they did recommend that the capital authorities not restart operations on this part till an in depth evaluate of no less than 5 “precedence care” conditions is carried out.
These are to take care of the separation between the Periférico vehicular bridge and the columns of the viaduct; restore cracks in columns, tablets with a excessive stage of leaks and broken heads; evaluate the reinforcement made within the part close to the Nopalera station; Deal with defects akin to inadequate spacing of beams, diaphragm cracks and inconsistencies as a result of stiffeners shorter than others.
As well as, though the underground half does not current structural harm that places its stability in danger, it’s not potential to reopen it so long as the collapsed part is not repaired, since it’s vital to take care of the trains and the tracks. On this half, water seepage and runoff had been recognized.
In the meantime, in an interview with Pascal Beltrán del Río for Radio Picture the Secretary of Works, Jesús Esteva, did not rule out that the failures of the collapsed part are current in different factors of the road.
THEY RECOMMEND NOT TO OPEN ELEVATED OR UNDERGROUND SECTION
After an visible inspection of the elevated viaduct of Line 12 of the Metro Collective Transport System, the Technical Committee for Structural Security of the Faculty of Civil Engineers of Mexico, AC, beneficial to the capital authorities not to restart operations on this part till the carried out an in depth evaluate of no less than 5 “precedence care” conditions.
To do that, from Might 5 to eight, 101 specialists in constructions, geotechnics, bridges and structure, grouped into 37 brigades, reviewed the sections between the Culhuacán station and the collapse level (floor zero), and the latter and the station Tlaltenco.
It was decided that, in 68 p.c of the sections, solely grade C deficiencies or affectations had been seen, that are widespread conditions that merely require motion in routine phrases (…).
Within the elevated part that did not collapse, they detected cracks in beams and heads, in addition to cracks in columns.
Whereas in 32 p.c grade B affectations had been discovered, which does not suggest in itself that the sections are of excessive threat and that, for the identical motive, they need to exit of operation, however that they’re stating conditions, vulnerabilities, pathologies, harm or deficiencies that have to be analyzed in better element ”, defined Bernardo Gómez, coordinator of the committee.
They added that they did not find grade A affectations, that is, they signify a threat of fast instability.
The sort of case in a number of of them there’s information that may come from the development of Metro Line 12 itself, nonetheless it should even be taken under consideration that we now have had totally different occasions all through it, such because the 2017 earthquake , which may have generated further degradation ”, he added.
Though the specialist identified crucial a extra detailed stage II or stage III evaluation, for now the precedence is to handle the separation between the Periférico vehicular bridge and the columns of the elevated viaduct of the Metro; restore cracks in columns, in prestressed tablets with a excessive stage of leaks and in heads broken by seismic buffers; in addition to reviewing the reinforcement made within the part close to the Nopalera station.
Different deficiencies detected are inadequate spacing of beams, cracks in columns, entrances and heads, in addition to diaphragms positioned poorly or nonexistent and inconsistencies as a result of horizontal stiffeners in shorter beams than in different areas.
Within the tunnel they noticed slight leaks within the vault. Photographs: Particular
The evaluation concluded that, though the underground half does not current structural harm or deformations that put its stability in danger, it’s not potential to open it so long as the collapsed part is not repaired, since it’s vital to present intensive upkeep to the trains and the 24.7 kilometers of tracks that comprise the complete Line.
As well as, water seepage and runoff had been recognized at totally different factors.
Francisco Suárez, an skilled in tunnels from the Faculty of Civil Engineers of Mexico, talked about that within the inspections it was additionally potential to understand that the observe construction presents issues that have affected the operation of the trains, which has generated working issues and extreme prices of upkeep.
Lastly, the Secretary of Works and Companies, Jesús Esteva, thanked the Structural Security Technical Committee for the work and mentioned that they are going to start to work based mostly on what has been dominated and the progress will probably be made identified to the general public in a well timed method.
The Secretary of Works, Jesús Esteva, with Luis Rojo, president of the Faculty of Civil Engineers of Mexico, AC Photograph: Cuartoscuro
DOES NOT DISCARD THAT FAULTS ARE REPEATED IN ANOTHER SECTIONS
The Secretary of Works, Jesús Esteva, did not rule out that the faults discovered within the part of the L12 that collapsed may seem at different factors alongside its route.
Given the findings, it’s thought of that these and different deficiencies might be repeated alongside the stretch ”, he mentioned in an interview with Pascal Beltrán del Río to Radio Picture.
He elaborated on the very fact that the metal beams and concrete slabs did not have the required power, as discovered by the DNV firm.
If we now have a composite part, which works the metal girder with the concrete girder, and disconnects, in fact it fails ”, he mentioned.
If that is resolved, the remainder of the road can be utilized, as a result of no important deformations are noticed within the foundations, or important deformations in columns ”.
-From the Editorial Workplace
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