Reducing pollution and disturbance with the evacuation of debris by cable

Using urban cable cars to transport rubble or earth from construction sites, for example. The aim? To generate less dust, less noise and less pollution than with a road transport solution

The example of Clichy

Copyright Sonia Safari Thomas Deschamps Egis

This 45,000 sqm property development led by the company Redman, in the eco-neighbourhood of Bac in Clichy-la-Garenne (Hauts-de-Seine), involves the demolition of the existing buildings, as well as the excavation of two hectares of land to a height of eight metres. It’s a massive challenge for our teams, who – on behalf of the planner Citallios, in a consortium with AD Ingé (agent) and S’PACE Architecture & Environnement – are responsible for EPCM of the earthworks, and management of the debris, much of which is contaminated. In total, some 250,000 tons of earth and rubble have to be evacuated, in an area already saturated with construction sites.

After studying various options, our consortium integrated the cable car solution into the design of the works, in line with the community’s strong desire to reduce the impact of the site. This is the only system of its kind in France: a cable car solution carrying excavated earth leading to river barges via the Seine.

The cable car, a worksite innovation

An overground cable car system now connects the construction site with barges moored about 400m away, along the Clichy dock on the banks of the Seine, for a period of 7 months.

This solution is a first in France for an urban site. Designed exclusively for this project by the company Mecamont Hydro, the cable car is 490m long and consists of two lines that operate independently of one another. Each of the four suspended skips transports up to 20 tons of rubble to the river, moving about 200 tons of earth per hour and 1500 tons per day.

Avoiding 80 lorryloads every day

For our work in this consortium, our teams had to take into account various constraints linked to the scale of these earthworks in a dense urban environment, and make sure the innovative cable car project was in line with technical requirements regarding the management of contaminated waste and the existence of adequate outlets accessible by water.

Concerned about the well-being of his constituency, Rémy Muzeau, Mayor of Clichy, has welcomed this particularly innovative solution. By prioritising fluvial evacuation, it avoids evacuation by land which would have required a rotation of nearly 80 trucks a day, leading to the equivalent of 2 tons of CO2 emissions, and generating significant noise, dust and road congestion in the area.

An environmentally friendly construction site

  • The use of river transport for the disposal of excavated material, an alternative method that reduces disturbance for residents and the environment (traffic congestion, air pollution, noise, etc.)
  • A minimum of trucks required to remove the debris resulting from demolitions in particular, for the installation of the cable car platform.
  • Combating construction dust: washing truck wheels, misting and manual watering of deconstruction areas with consideration of wind, stopping work in strong winds
  • Noise reduction: sound level monitoring to verify that regulatory thresholds are met.
  • Rehabilitation of neighbouring roads

Managing a city through its lights

Public lighting, providing urban supervision and savings

Public lighting, whether in the creation or renovation of a network, carries a current that can connect and therefore centralise data. Whatever its source, this data can contribute to urban performance, with operating savings achieved made available for reinvestment. Public lighting thus becomes “intelligent”.

Our expertise

  • “Lighting” diagnostics
  • Current situation and physical measurements
  • Regulatory analyses
  • Review, GIS database and technical proposals

“Power” diagnostics

  • Systems audit
  • Functional analysis
  • Analysis of development potential

Lighting strategies

  • Identification of needs and objectives
  • Planning of photometry and temporal objectives
  • Framework for evaluating energy savings

Legal and financial expertise

  • Financial and contractual arrangements
  • Design and development of operating contracts
  • Legal and regulatory strategy

Remote management of various technical equipment

  • Functional analysis
  • Hardware and software architecture: central system, remote equipment, transmission networks
  • Management of KPIs

Development of specifications

  • Monitoring and creation of the different systems
  • Procurement assistance for works contracts
  • Launch and monitoring of the system’s operation



Public lighting accounts for 18% of consumption and 22% of energy expenditure for local authorities. With a little over 5.3 billion kWh, street lighting is the number one source of municipalities’ electricity consumption (45%) and expenditure (38%). (Source: Ademe) In order to reduce this electricity consumption, the best solution would be to implement a coherent methodological approach, without harming its two fundamental objectives, which are the comfort and safety of users. These savings can be made possible by capitalising on the power line. Making lighting smarter…

The ecological renovation of the Montparnasse tower (France)

A super-passive tower
A smart-grid-ready & symbiotic tower
A positive energy & ultra-low carbon tower
An innovative & frugal tower

copyright lucas-gallone-unsplash

Elioth, an Egis group subsidiary, took out top spot in the competition for the renovation of the Montparnasse Tower, alongside Nouvelle AOM, a collaboration between the three French agencies Frank Linazzi , Chartier-Dalix and Hardel & Lebihan

In 2030, the city of Paris will be able breathe again. In complete sync with the climate, the wind, and the light of the sky, Montparnasse tower will become a symbol of its time. “Super-passive”, the building joins the ranks of the world’s most efficient new builds. And it is even set to overtake them in terms of its carbon footprint, by saving on resources required for its reconstruction. This is a virtuous tower – an oxymoron made possible through the choice of its rehabilitation and extension of the lifespan of its structure and foundations, the building elements that generate the most greenhouse gas during construction.

With this very first, energy positive and low carbon renovation, following the removal of all asbestos Montparnasse Tower will reduce its energy consumption by 10 compared to the original project. It will be self-sufficient for 70% of the time it is in use, during which time it will not draw on any active systems and simply glide along. In addition to being exemplary for its energy efficiency, it will also be beautiful, standing tall with its ever-changing and light-filled “weather-coloured” exterior. This ultra-contextual and symbiotic Parisian tower will blend seamlessly into its neighbourhood, improving urban air comfort and promoting the mutual benefits of energy complementarity, including with the train station and future developments in the area.

“The future Montparnasse Tower will be multifunctional, active 24 hours a day and exemplary when it comes to the environment, with a tenfold reduction in its current energy use. It will be the world’s first “wind tower”, capturing wind energy and minimising mechanical ventilation. Finally, 80% of the existing façade will be re-used inside the tower, magnifying its heritage.”

The design of the façade rests on two key concepts: on both side of the building hanging gardens will be constructed. The first ten floors of offices will have conservatories, with outside access provided along vast balconies. These spaces bring an almost homely touch to the lower office, and create an urban feel through their dialogue with the environment around the Tower. They also reduce wind at the base of the tower, improving the urban comfort of the surrounding area.

The other element which will improve public space through marginally adjusting the existing layout, is the establishment of large tree-covered patios at each of the four corners of the site. Anchoring the Tower even deeper into the Parisian soil, they reduce the “downwash” wind effect, bringing comfort to the esplanade and helping guide pedestrians between the Rue de Rennes and the future train station. The wind tower, this “Eole-Montparnasse”, is a designed to look after us, both inside and out.


Yhnova, the first 3D-printed house

crédit Yoan Richard

In a first for France, Egis has been chosen to carry out EPCM for the “Yhnova” project, in partnership with the TICA architecture workshop in Nantes. This project is supported by the Caisse des Dépôts. Egis has submitted a project study (PRO) for the Yhnova operation in Nantes, which involves building a house using a process of “additive synthesis”, also known as “3D printing”, for the very first time in France. The operation came about thanks to the Batiprint process developed by the University of Nantes and its partners.

A mobile robot, equipped with an articulated arm, pours two panels of polyurethane, then pours concrete between these two panels, which thus represent both the formwork and the insulation of the wall. This process takes advantage of the use of digital modelling (BIM).

As design consultants for the TICA architecture firm, Egis provided full EPCM services for the main structure, HVAC and electricity and played a key role in developing the innovative 3D printing process. Structurally, the teams needed to work out the type of reinforcement needed for the printed concrete walls (implementation techniques, rules of calculation to be used, etc.). For air- and watertightness, it solutions were invented to correctly insert the exterior joinery and interface the walls with the roof – all in accordance with industry best practices for such works. The site was then able to undergo an “Appréciation Technique d’Expérimentation” technical appraisal by the CSTB. Finally, at the end of the works, Egis was responsible for evaluating the carbon impact of the construction of the building.

Economic and environmental benefits

This process reduces construction time, improves thermal insulation, and reduces construction operating costs. The use of a mobile robotic tool enables a new approach to working methods in the field of construction, which, like in industry, are crucial to reducing the arduousness/physical stress of work and help limit jobs at risk or which can lead to RSI.

Read the article “What if we printed social housing?” on the Egis Convictions blog



Innovative ground surfaces to improve hygrothermal comfort in cities

As part of the redevelopment of Lyon’s Part-Dieu district, Egis tested innovative ground surface solutions based on the reflective power (albedo) of certain coverings and materials. There are various new solutions to ensure a pleasant temperature and humidity level in cities, whatever the season. Among them, “cool ground” surfaces are one of the most promising.


copyright Elioth

As part of the redevelopment of Lyon’s Part-Dieu district, Egis is testing innovative “cool ground” surface solutions based on the reflective power (albedo) of certain coverings and materials. The principle is simple: to come up with new ground surface materials with specific thermal properties that help combat urban heat islands (temperature increases due to urbanisation) and improve thermal comfort in winter.

Cool ground

All current research suggests that ground surfaces not only have a significant effect on the urban climate, and therefore on the heat island effect, but also that they are one of the main contributors. The properties of different materials will also influence the local microclimate through the albedo effect, which measures the amount of sunlight reflected by a surface, as well as their insulation and thermal inertia properties. In order to fight against the heat island effect, it is essential to reduce the surface temperature of ground surfaces, especially in the summer. One of the most important aspects of these often highlighted phenomena is the albedo, that is to say the proportion of radiation reflected, of materials used in urban spaces. For example, the zinc rooftops in the historic centre of Lyon reflect about 60% of sunlight and heat less than classic roof tiles, which reflect about 20%.


Initial results (from March 2017 to mid-October 2017)

During the heat wave in June, dark concrete and asphalt surface temperatures rose to 65°C, where the variable surface albedo tests remained below 55°C. On the experiment table, initial results show significant differences in thermal behaviour depending on the covering used (up to 20° difference between the tested surfaces). They confirm, in particular, that the use of granite (planned for major future constructions in the district) is more virtuous (less than 50°C surface temperature) than the more traditional materials for public spaces such as asphalt and concrete (more than 65°C surface temperature). 

Final objective

Research into increasing albedo is important but only focuses only on the issue of reducing ground temperature. At Egis, our goal is to find a material that has a low surface temperature in summer, but also – as unnatural as it may seem – a higher temperature than normal in winter. This material would not only help prevent heat islands in summer, but would also mitigate the drawbacks of the cold winter weather. Independently, these two requirements are achievable, but the innovation here lies in combining the two properties into a single material.


A 50 sqm experiment table, made up of 12 ground cover samples, was installed on Rue Bouchut to carry out these tests. Six of the samples are existing materials used as a yardstick (concrete, asphalt, stabilised soil, etc.). Six others are sample prototypes of “variable albedo” surface coverings, with different characteristics. The aim is to compare the properties of the materials over several seasons and under different climate conditions.

Egis is conducting this experiment as part of Lyon’s Ecocité project, which focuses on the redevelopment of several districts in the city. The project, sponsored by SPL Lyon Part-Dieu, receives funding from the Programme of Investments for the Future (PIA), operated by the Caisse des Dépôts. For more information, see the Elioth Lab publication (french version).

Housing for all in India

The PMAY programme (Pradhan Mantri Awaas Yojana)


Launched in 2015 by the Indian Prime Minister, this programme aims to make “housing for all” a reality by 2022; housing with access to water, electricity 24/7 and sanitary facilities. The programme aims to build 50 million homes in just five years.

Workshops were organised in close collaboration with the Public Works Department (PWD) and the Madhya Pradesh State Government. The purpose of these workshops was to clearly define the expected roles and responsibilities of all stakeholders.

Egis is providing project management assistance (PMA) for this project.

Find out more

A Climate, Air and Energy Plan (PCAEM) for the Greater Paris area

Egis is assisting the French capital with structuring action in the region to offset greenhouse gas emissions, embrace energy transition, reclaim air quality and adapt to climate change. The plan aims to consolidate local municipal action and encourage regional transition. Developing multifunctional “smart” public facilities (lighting, power generation, internet connections, etc.)




Created in a very short space of time, with the support of Egis Consulting teams, the PCAEM is the first strategic document of the Métropole du Grand Paris, and represents an unprecedented initiative, both in terms of the scale of the challenges to be addressed, and the size of the area covered. Last Monday, Patrick Ollier, president of the Métropole du Grand Paris, officially launched the communication on the climate plan. The Metropolitan Council unanimously adopted the draft Climate, Air and Energy Plan (PCAEM) at its meeting on 8 December 2017. The Métropole will play an active role in mobilising a diverse range of key players to achieve the ambition of the Paris Agreement. This first Metropolitan Climate, Air and Energy Plan aims to respond to the urgency of the climate challenge and to come up with a long-term roadmap for organising ecological transition and improving the resilience of the region and its inhabitants. To find out more, you can read the PCAEM plan here



Renovating historic buildings

Renovating historic buildings is about highlighting their remarkable and timeless character through a process of renewal

The Richelieu Library (the historic National Library of France) located in Paris’s 2nd arrondissement, is a good example.

copyright Céline Bellec

Partly located in Hôtel Tubeuf, a mansion built in 1635, the Bibliothèque Richelieu is one of the sites of the Bibliothèque Nationale de France, a legacy of the royal library developed in 1666 under the direction of Colbert, in praise of Louis XIV. One of the challenges of renovating Richelieu is revealing this architectural heritage and allowing the general public to enjoy previously inaccessible spaces. The project will be completed in 2020.

Egis is in charge of EPCM services for all trades on this site. Egis’s digital and collaborative project management solution SGTi4 (french website) has been implemented on this project.

The Audit, Renovation & Heritage department is an Egis entity in charge of existing buildings and property management. It specialises in the diagnosis of existing buildings, recommendations for renovation projects, and the analysis of the development potential of a building. The wide range of properties entrusted to it have enabled the department to work on buildings from all periods and of all types.The diversity of profiles within the team (Architects-Engineers, Specialist Engineers, and so on) means it can handle technical, functional and architectural components, while maintaining overall coherence, inherent to each project.

It carries out different types of assignments:

  • Technical, functional and environmental audits
  • Real estate strategy
  • Transformation feasibility studies
  • Renovation EPCM.

Other iconic projects:

Your WELL certified buildings

For the well-being of their occupants

Real estate is a major issue for organisations. It constitutes the second largest budget item after salaries. In an economic world in motion, organisations are evolving, adapting and optimising themselves. Alongside this, employment is changing and spaces are reflecting the strategy and this cultural and methodological transition. Employees are developing new expectations concerning their working areas and conditions.

With WELL certification, you can revolutionise your real estate for the benefit of all its occupants!


As part of its “My office by Egis” service, Egis is offering to certify your buildings with the new WELL building standard.

This standard measures, certifies and monitors the performance of features of the built environment that influence people’s health and well-being:

  • Air,
  • Water,
  • Nourishment,
  • Light,
  • Fitness,
  • Comfort
  • and Mind.

Download the brochure: My Office integrates the Well Building standard element (french version)

In February 2017, the Well Building Institute website listed just 10 accredited professionals in France.

To find out more about the WELL certification


Through its subsidiary Acoustb, Egis offers solutions for controlling noise, vibrations and electromagnetic waves from infrastructure projects, buildings and industrial sites

Acoustb has nearly 21 years’ experience working on highly complex projects, and its teams of highly specialised engineers and technicians mean it can offer its customers solutions to meet their specific needs and circumstances. Acoustb works in all fields of acoustics, vibrations and electromagnetism (metrology, PMC, consulting, engineering, consultation and training):

  • Environmental noise: impact studies (transport infrastructures, mixed development zones, ICPE sites – classified on environmental grounds, and construction sites), qualification of the initial state, modelling (reverse ray tracing, finite elements, complex modelling), acceptance measures, consultations and public meetings
  • Buildings: design as part of a project management team, from the tender until works handover, a PMC service, diagnosis and design of acoustic measures in specific locations (theatre, amphitheatre, vast spaces)
  • Industry: handling of problems specific to the industrial environment, noise pollution in the vicinity and health at the workplace
  • Vibrations: impact studies for vibrations from transport infrastructure (metro, tram, train), risk analysis and structure-borne sound propagation in buildings, research & development (source modelling, ground/structure interaction)
  • Electromagnetism: measurements and calculations of low frequency (power lines and electrical facilities) and high frequency (mobile phone antennas) electromagnetic fields, risk analysis

“Innovation is in Acoustb’s genes” by Maxime Jabier, director of Acoustb:

  • To keep up with the major trends of the building trade, Acoustb has joined a working group – named Adivbois – whose studies focus on timber constructions: “While in instruments, wood produces the sounds adored by music lovers, for timber frame buildings, this material is a sensitive issue that involves a completely new approach to acoustics. Given that we have very little feedback on this topic, we decided set up a specific working group on acoustics and timber constructions.”
  • For line 16 of the Grand Paris Express, Acoustb was tasked with designing the interior and exterior of six stations. Unlike eyes, ears cannot be shut; the brain is always attentive to noise. And since noise is all around us, why not create musical spaces with specially designed acoustics? Imagine introducing sounds other than that of the pinging of the metro doors… For this project, we wanted to go beyond the limitations of the initial specifications, by offering a sensitive auditory experience. Rather than leaving passengers plagued by resonating footsteps or suitcases on wheels dragged along the ground, we devised subtle soundscapes that permeate the endless corridors, without attracting attention.”
  • For the city of Lille, Acoustb responded to two invitations to tender as part of an urban renewal project. The area in question is close to the ringroad and subject to high noise exposure. To ascertain the expectations of residents, Acoustb offered to work with an urban sociologist and geographer, as well as a psycho-acoustics specialist. And not unlike a conductor, Acoustb played the role of systems coordinator. Using sound recordings, Acoustb conducted an auditory mapping of the location, and put forward an initial diagnosis to anticipate future developments and ensure that the sound becomes softer on the ears. Meanwhile, Acoustb also studied the possibility of setting up a multi-use noise barrier. Acoustb opted for solar panels, a water recovery system and greenhouses. ”