General News

They create a committee to reinforce Line 12; DNV delivers first preliminary ruling


A high-level technical staff will perform an government reinforcement and rehabilitation venture in order that Line 12 can function as quickly as doable in secure situations, introduced the top of presidency, Claudia Sheinbaum.

This resolution has the assist and settlement of President Andrés Manuel López Obrador, ”he mentioned.

The staff, which ought to have its plan in a month, might be made up of worldwide specialists similar to Sergio Alcocer, Bernardo Gómez, Juan Manuel Villa, Rubén Ochoa and José María Riobóo.

In accordance to the preliminary ruling of the DNV firm, a structural failure would have precipitated the collapse of the Golden Line, which left 26 useless on Might 3.

When presenting the first report of three to be delivered, representatives of the Norwegian agency described deficiencies within the development course of, similar to lack of Nelson bolts in beams, several types of concrete, unfinished or poorly executed welds, amongst others.

For instance, they defined, an space of ​​one of many collapsed metal beams solely had three bolts when by design it was supposed to have twelve.


The first preliminary ruling of the DNV firm on the causes of the collapse of a part of the elevated viaduct of Metro Line 12 factors to a failure of the construction related to deficiencies within the development course of.

Though the representatives of the Norwegian firm said that the investigation shouldn’t be accomplished and two extra experiences are but to be delivered, they described several types of concrete within the tablets or slabs, welds of metallic components not accomplished, poorly executed, poorly supervised or with out dimensional management.

They additionally identified deficiencies within the welding processes and lack of Nelson bolts, in addition to porosity and lack of fusion within the bolt-lock joint.

After the collapse and collapse of Might 3, the metal beams and slabs have been separated, which might present that they didn’t work as a “composite part”.

The investigations detailed that the 2 collapsed bridge sections have been lacking bolts, as in a part of the beam positioned on the east facet of the construction, which solely had three bolts, when by design it ought to have 12.

The foregoing permits us to set up in a preliminary manner that the incident was attributable to a structural failure, related to at the very least the next situations recognized to this point:

Deficiencies within the development course of: welding technique of the Nelson bolts, porosity and lack of fusion within the bolt-girder joint, lack of Nelson bolts within the girders that make up the bridge meeting, several types of concrete within the slab, no welds. accomplished and / or poorly executed, supervision and dimensional management in fillet welds ”, mentioned Jesús Esteva, Secretary of Works and Providers.

Deficiencies have been detected within the welding technique of the Nelson bolts, in addition to porosity and lack of fusion within the bolt-lock joint.

DNV’s first report didn’t reveal main defects or geometric issues within the totally different components of the monitor system similar to rails, sleepers, ballast and monitor change gadgets.

Throughout the presentation of the report, the Head of Authorities of Mexico Metropolis, Claudia Sheinbaum, said that the delineation of tasks is the accountability of the Lawyer Basic’s Workplace.

As well as, he added that he’ll meet with the development consortium to start a “technical dialogue.”

Bolts have been additionally lacking within the girders that make up the bridge meeting. As well as, there have been unfinished and / or poorly executed welds

Excelsior printed on Might 28 that the metal beams and concrete slabs didn’t work as a “composite part”, in accordance to a report from an engineering agency requested by a personal firm.

As well as, this examine additionally discovered that the bolts that joined each our bodies had their throats minimize within the space of ​​the weld, a sign that mentioned “compound part” misplaced effectivity.

Altogether, metal beams and concrete slabs had to assist some 700 tons, in accordance to the structural report that this newspaper had entry to.


The top of presidency, Claudia Sheinbaum, introduced the formation of a committee, whose staff will perform an government venture that ought to be prepared in roughly one month to restore service on Line 12.

It’s up to us, the top of presidency, that Line 12 can function as quickly as doable in situations of most safety.

With the data we now have in the intervening time, we now have made the choice to type a technical staff of the very best stage to perform an Govt Undertaking for the Reinforcement and Rehabilitation of Line 12. I would like to say that this resolution has the assist and settlement of Mr. President of the Republic, the lawyer Andrés Manuel López Obrador ”, he expressed.

The Technical Committee for Reinforcement and Rehabilitation of Line 12 is made up of six acknowledged specialists who might be coordinated by the Secretary of Works and Providers.

The top of Authorities, Claudia Sheinbaum, yesterday when presenting the first preliminary opinion of the DNV firm / Picture: Karina Tejada

The president of the capital mentioned that she is going to contact the businesses that made up the L12 development consortium so as to set up a technical dialogue.

As well as, this week the complementary measures to strengthen mobility round Metro Line 12 might be introduced.

Sheinbaum identified that at this time the first outcomes of the overview of assorted sections of Line 12 by the Faculty of Engineers and different collaborating firms might be introduced.

He mentioned that the victims are handled for complete reparation of the injury with a humanistic perspective and a public servant is shut to them.


The development of Line 12 of the Mexico Metropolis Metro, higher often known as the Golden Line, had the participation of dozens of private and non-private entities, each nationwide and worldwide, and lots of of engineering specialists.

Regardless of this, a a part of the elevated part collapsed on Might Three when a convoy handed between the Olivos and Tezonco stations, leaving to this point 26 useless and greater than 90 injured.

Now that the preliminary knowledgeable opinion of the Norwegian firm Det Norske Veritas is being printed, it’s important to know a number of the foremost gamers within the development of the Golden Line.


To hold out Line 12, a decentralized public entity with technical and administration autonomy was shaped known as the Metro Undertaking. Its goal was the coordination of development, supervision and tools.

This physique was constituted in 2008 and extinct in 2017, it was headed by the engineer Enrique Horcasitas.

To that is added the participation of the Central Works Committee and Technical Subcommittee, that are two collegiate our bodies invited by the Authorities of Mexico Metropolis. They consisted of a whole of 30 senior officers and engineering specialists, whereas 74 extra specialists have been a part of the subcommittee.

To resolve on the design and development of L12, the consortium in command of development introduced proposals and these have been evaluated and determined by the Committee and Subcommittee beneath technical standards.


For the prepare service, the federal government of the then Federal District opted for a long-term service provision contract that included 30 trains with particular technical specs.

To this was added predictive, preventive and corrective upkeep, in addition to spare elements, technological updates, cleansing and assurance, amongst different providers.

After a global market examine, the authorities chosen the Spanish firm of Construcciones y Auxiliar de Ferrocarriles (CAF).


One thing vital for this sort of development is to have entities that perform a constructing supervision course of.

On this case, Integration of Engineering Processes (IPISA) was the one who headed the Supervisory Consortium, which is chargeable for the civil and electromechanical works venture.

This consortium was additionally made up of Consultoría Integral de Ingeniería (CONIISA), which was in command of inspecting the civil and electromechanical works, which incorporates roads, electrification, mechanical methods, signaling, automated piloting, centralized management, telecommunications and toll system. .

However, Ingeniería, Asesoría y Consultoría (IACSA) carried out the sector overview of the civil works; Moreover, she was in command of the Tláhuac workshops and the Tláhuac station to Pueblo Culhuacán-Atlalilco.

Different members of the consortium have been Lumbreras y Túneles, the Institute of Engineering of the Nationwide Autonomous College of Mexico, the Firm of Financial Research and Engineering SA de CV and the Nationwide Polytechnic Institute.


After successful a global public tender, the consortium that constructed L12 was made up of two Mexican firms and a Mexican subsidiary of a French firm.

The members shared the event of the mandatory research and evaluation, preliminary initiatives, government initiatives, development, mounted installations, checks, idling and commissioning, set up of power provide methods; signaling; monitoring and management; and the elevated part of the metallic construction the place the accident occurred.


The method additionally featured a consortium made up of Hamburg Seek the advice of GmbH, ILF Beratende Ingenieure AG, TÜV-SÜD RAIL GMBH and DB Worldwide GmbH; who reviewed and validated the signaling methods, automated piloting, centralized management, high-voltage electrical power, high-voltage electrical substation, rectification, distribution, traction and catenary substations, prepare telephony, direct and automated telephony, and tracks.


Throughout the suspension interval of the elevated part of Line 12, the Federal District authorities arrange a consortium to discover the faults and their doable repair.

This was made up of Triacaud Societé Organisé, Systra, Comsa Emte, Multidín, TÜV Rheinland de México and Societé Generale Surveillance.


Among the many establishments contributing to the preparation of experiences are: Particular Fee of the Chamber of Deputies. Superior Audit of the Federation. Establishments that participated within the report of the Legislative Meeting Faculty of Civil Engineers of Mexico. Mexican Affiliation of Transportation Engineering.


Visit our Last minute

About the author

Donna Miller

Donna is one of the oldest contributors of Gruntstuff and she has a unique perspective with regards to Science which makes her write news from the Science field. She aims to empower the readers with the delivery of apt factual analysis of various news pieces from Science. Donna has 3.5 years of experience in news-based content creation, and she is now an expert at it. She loves journalism, and that is the reason, she moved from a web content writer to a News writer, and she is loving it. She is a fun-loving woman who has very good connections with every team member. She makes the working environment cheerful which improves the team’s work productivity.

Add Comment

Click here to post a comment