Client & Project Manager

Features

Approach spans : prestressed concrete box girders
Main span : Orthotropic steel slab
Length : 2 164 m
Main span : 1408 m
Height of the pylons : 322 m
Height of the deck : 5,50 m
Width of the deck : 59 m
Number of stiffening cables : 176
Number of hangers : 68

Mission of Diades

Our mission is an intellectual service mission carried out with the framework of the multi-year follow-up of the bridge. It consists in carrying out the initial inspection of the sensitive elements, the annual inspections and the general inspections of the structure. Inspections cover the entire structure, in particular the 68 hangers, the deck bracing, the specific support devices installed in the seismic zone and all the particular devices fitted to this type of hybrid structure. Monthly monitoring of the instrumentation with reporting and behavioural analysis of the structure is also carried out thanks to the data transmitted by the multiple sensors fitted to the structure.

Download the project sheet

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Our locations

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PARIS

Head office setec diadès Paris
Immeuble Central Seine
42-52, quai de la Rapée
CS 71230
75583 Paris CEDEX 12

 

AIX-EN-PCE

ZAC Le Griffon
7 Chemin des Gorges de Cabriès
13127 Vitrolles

 

STRASBOURG

13 quai Kléber
67000 STRASBOURG

 

LYON

Le Crystallin
191/193 Cours Lafayette CS 20087
69458 LYON cedex 06

 

BORDEAUX

42–44, rue du Général Larminat
33 000 BORDEAUX

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Client & Project Manager

Features

The footbridge was constructed at the same time and in the same area as the construction of seven residential buildings and a car park. These interactions made the management of the activities more complex.

• 40 metre footbridge extended by a 100-metre aerial path

 Mission of Diades

Diades was tasked with carrying out the complete project management for the building of the footbridge. The task consisted of the following phases, some of which were carried out, at the design stage, in collaboration with Setec Tpi:

• Preliminary studies with architectural design,
• Pre-project studies,
• Project studies,
• Preparing tender documents,
• Assistance in awarding contracts,
• Project conformity assessment and approval of plans,
• Supervision of works,
• OPC,
• Approval of works following completion.

 The works were carried out in 12 months.

A bowstring type structure was selected following research into the bridge’s integration within the landscape and how best to highlight it.

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Located on the by-pass motorway of Rabat in Morocco, the crossing structure of the Bouregreg’s wadi (a few hun-dred meters from the Sidi Mohamed Ben Abdallah dam) with a length of 954.40 m is composed of a cable-stayed viaduct and a post tension prestressed beams bridge.

The architectural design, especially of its 2 pylons, combines modernity and influences of traditional Moroccan culture.

 Owner and Manager

Features

The inspection of the deck of the cable-stayed viaduct required an importation from France of a negative boomlift for the passage between the stays, and our special drone.

Mission of Diades

Our mission was to conduct the Initial Detailed Inspection of the Mohammed VI Viaduct, under the terms of the ITSEOA 2010 February 16, 2011.
Given the architectural characteristics of this structure, the access means used had to be adapted accordingly.
In particular, the detailed inspection of the pylons was carried out using the Diadès Drone whereas the interior and the inferior facing parts of the pylons were controlled by rope access technician under the management and responsibility of Diadès.
The inspection of the intrados was carried out with the aid of a negative boomlift with sufficient articulations to pass through the cable-stays.
As part of this IDI, a control of the tension and the damper of the cable-stays by the vibrating method was conducted.

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These missions concern detailed studies of the service levels of structures, by analysing the real residual bearing capacities of the structures beyond the regulatory verifications, and by accompanying these measurements with post-critical calculations based on targeted investigations. These measurements are often accompanied by adapted monitoring programs and allow to determine the predictive behaviour of structures.

These missions can be used to alleviate or postpone major maintenance and repair/reinforcement programs due to budget or operational constraints, for example.

We also carry out “forensic engineering” missions in order, for example, to trace the precise kinematics of the ruin of a structure, within the framework of an expertise operation for example.

These missions can combine maintenance, programming, monitoring and follow-up of the behaviour of materials and structures. They can be used in particular by concession grantors to guarantee the condition and validity of the concession contract for an infrastructure, or by concessionaires to obtain a road, motorway or rail concession, within the framework of a call for tenders for concessions.

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For public or private clients, we carry out site monitoring adapted to the importance and technical nature of each operation. We ensure the technical, financial, and contractual follow-up on behalf of our clients and ensure in particular the drafting of the reports of the meetings of building site, all the Quality controls by piloting the laboratories of external control and we ensure all the lifting of stopping points necessary to the good progress of each operation.

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Depending on the nature and procedures of our customers, we can adapt the program to each operation.

Before starting a project, our missions can concern preliminary studies or feasibility studies aiming at refining and orienting further the diagnosis-prognosis, by serving as a basis for the future prime contractor program.

We also produce bid analysis reports, corresponding to an ACT 2 phase.

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These studies are based on complex calculations fed by real hypotheses of structure operation (investigations, surveys, monitoring) and transcribed in a note of shared hypotheses serving as a basis for modelling. The calculation models can be calibrated by load tests.

The results can be used for a post-critical behaviour analysis to assess the structural health reserve of a structure.

Diadès carries out, through expert, neutral and independent partners, complete diagnoses to deal with any problem.

This complementarity concerns all types of tests and investigations on concrete and stone, as well as in the following fields

• monitoring,

• anticorrosion diagnosis,

• paint diagnosis,

• mechanical and physical laboratory tests on metal,

• Vibration analysis and structure signatures,

• radiography,

• crossbow tests,

• electromagnetic impedance recognition (cables),

and also :

• topography,

• optical analysis or stereo photogrammetry,

• geophysics,

• geotechnical, geological, and hydrogeological surveys, etc.

• hydraulic studies and water law files,

• …

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Download the Diadès drone brochure

We carry out inspection, control, removal of doubt and acquisition of information for the development of diagnosis of structures on types of bridges:

• Piers and decks

• Dams

• Industrial chimneys

• Wind turbines, photovoltaic fields

• Rocky trenches, cliffs, slopes

• Buildings

• Air coolers

• Towers, radio transmitters…

The use of drones simplifies the logistics of structure inspections and greatly minimizes the impact on operations. From a safety point of view, it allows to limit and better target access to dangerous or difficult areas.

The diversity of our fleet of drones allows us to intervene effectively on all categories of structures, indoors and outdoors, and to respond in the most appropriate way to the needs of each service, depending on the equipment to be carried. Our aircraft are equipped with proximity sensors that inform the operators in real time of the distance between the facing and the drone. We are therefore able to ensure an optimal flight distance for all our acquisitions.

Geo-referencing of images

A GPS, an altimeter, a magnetometer as well as distance meters and other specific equipment developed by Diadès, provide precise information on the position of each photograph to the nearest centimetre, in particular for better monitoring of pathologies over time and better diagnosis thanks to post-processing.

Photogrammetry, 3D modeling

Objects of the missions

• Calculate volumes and surfaces, take measurements
• Integration of data in CAD and GIS software
• Integration of projects in a georeferenced model

Restitution 

• Aerial photos and videos, georeferenced orthophotographs
• Point clouds, 3D models (3D software compatible)
• Digital Terrain Models (DTM), topographic plans

Examples of 3D renderings

EVIR 2

Flying machine for close inspection in confined spaces, our EVIR system is fully operational and several missions have already been carried out, notably for EDF, Hydratec…

Choice of the drone

The diversity of our fleet of drones allows us to intervene effectively on all categories of structures, indoors and outdoors, and to respond in the most appropriate way to the needs of each service, depending on the equipment to be carried.

Our aircraft are equipped with proximity sensors that inform the operators in real time of the distance between the facing and the drone. We are thus able to ensure an optimal flight distance for all our acquisitions.

Choice of sensor

High Definition Sensors

Our cameras feature high-definition sensors from 20.2 to 64 MP, providing clear images even in low light conditions: wide dynamic range, high sensitivity and low noise for high detail and excellent definition.

Infrared sensors

Designed for thermography, our thermal camera has two simultaneous spectral channels (day and thermal channels). It is possible to switch remotely between the two cameras. The minimum, average and maximum temperatures can be displayed in the image.

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We carry out missions of census, inventory, specific visits, detailed inspections, and expertise.

These missions consist in carrying out, with or without specific access means, a visual expertise of the apparent state of a structure. These missions are carried out by our experienced inspectors and technicians who are specially trained in the field of civil engineering pathology. Whether in initial training, continuing learning or in a specific support program, our skilled personnel use these defects finding to develop the “foundation” of diagnosis engineering. The findings and interpretations of the “existing” must therefore be precise, relevant, and reliable throughout the projects that we carry out after these missions.

These missions also generally make it possible to refine the program of specific investigations after a first report of the external state of the structure.

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