Categories for Public

Without trenches or manhole shafts

26 January 2023
CTHM pursues the development of its trenchless techniques.  The Régie Autonome de Kénitra (RAK) [Kenitra independent authority] is launching rehabilitation works on collector D, T230, located under the busy Mohamed Diouri Avenue, which links Place de la Gare to Oued Sebou, (1.5km). Project The teams will rehabilitate this straight-lined combined sewerage system, gaining access via existing manholes: On-site polymeric UV close-fit lining along a 224m-section in 500mm-diameter concrete Concrete spraying along 1.2km of T230 ovoid sewers with rubble stone (a more suitable technique than the laying of liners for equivalent hydraulic capacity) Pitting and levelling with mortar of 29 manholes… +

SADE the outstanding choice for Choisy…

24 January 2023
 …to rehabilitate a large retention tank in the event of H2SO4 accidents. Veolia Eau d’Ile-de-France (VEDIF), delegate of the Ile-de-France Water Authority (SEDIF) is responsible for ensuring the public water supply service, in addition to the maintenance of the Authority’s heritage network. In this regard, VEDIF called on the Civil Engineering and Special Works Agency of the Rennes Regional Division to carry out the tanking by Hydroclick® of the emergency retention basin, located under the two 60m³ sulphuric acid tanks (H2SO4) of the Choisy-Le-Roi water production plant. The Ivry-sur-Seine Agency (Paris Regional Division) also… +

Tangier and Marrakesh adopt close-fit lining

14 December 2022
For the rehabilitation of wastewater networks in tourist areas. Radeema and Amendis, experts in water cycle and Moroccan subsidiaries of the Veolia Group, are leading a multiannual works programme to ensure high-performance public service, save water resources and protect natural areas. On behalf of Radeema, works in Marrakech will consist in the rehabilitation by UV close-fit lining of 200m of wastewater pipelines (400mm to 600mm-diameter). The specificity of these pipelines is their location in two very busy tourist areas of the medina: one section in front of the Dar El Bacha monument, former palace of the Pacha of Marrakesh, and… +

Renovation of the Clichy-la-Garenne wastewater treatment plant

18 November 2022
Civil engineering works, poles and cover slab for basin T30. Built almost 160 years ago, the Clichy-la-Garenne pre-treatment plant (operated by the Paris Wastewater Authority (SIAAP)) is the transit point for a significant proportion of wastewater from the Paris conurbation. The large-scale renovations to this plant include the building of a new 70,000m³ storage basin for surplus rainwater, the modernisation of the current pre-treatment unit and the building of a second unit. Order 1 works began in 2019 with the laying of diaphragm walls, the coupling beam and apron of this imposing T30… +

After Tangier and Rabat, close-fit lining continues its path through the medinas…

20 October 2022
…and is currently under way in Rabat! At the initiative of His Majesty King Mohammed VI, the Moroccan Government launched a rehabilitation programme in Morocco’s 32 medinas to renew these living and business districts which are home to 750,000 people, i.e., 3.6% of the country’s urban population. At present, 14 of these districts are undergoing active rehabilitation. This programme also enables CTHM, our Moroccan subsidiary, to stand out from the competition with the implementation of trenchless techniques which are particularly suited to these dense urban environments, made up of narrow lanes that are home to intense business and retail activity.… +

An underground basin in Rouailler, the 4th and final step of a long-term project

26 August 2022
The adventure of the Rouailler basin began in 2011, in the Livry-Gargan municipality of Seine-Saint-Denis, on behalf of the Departmental Council, with the Water Department acting as project contractor. This new basin will replace the existing facilities, which are no longer adequate given the municipality’s urban growth, and augments the municipality’s service network, notably to include surplus stormwater drainage. On a broader scale, this project forms part of the overall rehabilitation of the department to enhance the sanitary quality of local waterways, by ending the discharge… +

Supplying drinking water to the town of Thonon

21 July 2022
A daunting challenge, given the Allinges and Lyaud mountains, to be met with an MTBM! A portion of the water supply pipe, dating from 1936, which links the catchment point in the natural springs of the Blaves galleries (Lyaud) to the Chavannes reservoir (Allinges) was collapsing and in need of replacement. This is a particularly significant operation for the Thonon conglomeration and its users, as the network in question supplies 90% of the town of Thonon-les-Bains and ensures safe water for more than 30,000 inhabitants. Given the local topography (a hill over… +

A technically challenging project

20 January 2022
following the collapse of a 19th-century underground structure in Valenciennes. In early September 2021, the Valenciennes Métropole Local Authority (CAVM) made an urgent call to SADE Special Works. The vault of a 19th-century gallery, located under Place de l’Esplanade in Valenciennes, partially collapsed following road redevelopment works. This gallery channels the Grand Bruille underground river. A key facility for the CAVM, the recommissioning of the whole square had to be executed urgently: the road works were scheduled to resume in mid-October on the collapsed portion, and reinforcement works to the structure had to be completed by… +

SADE contributes to economic recovery

20 January 2022
SIZIAF is the manager of a 460ha industrial estate located in the Douvrin and Billy-Berclau municipalities. It is responsible for the structural development, management and economic growth of the Artois-Flandres industrial park.  Geared primarily towards industrial companies, the first firm to locate to the estate in the late 1960s was La Française de Mécanique. This industrial estate continues to grow today. A new 90ha plot was freed up and redesigned on the former Française de Mécanique site, notably for the firm ACC, winner of the French government’s recovery plan for the car industry and innovative entities. ACC is Europe’s leading… +

Large-scale drainage works to the north of Tours

2 December 2021
5 years after La Riche, Rennes RD and SADE Special Works pooled their expertise once more on behalf of Tours Métropole, for vast drainage works between Tours and Saint-Cyr-sur-Loire. Broken down into two orders attributed to the Rennes RD and SSW, this 15-month, out-size task involved the extension of the drainage network to the north of the Tours metropolis, with the building of a primary collector to transport wastewater to the main treatment plant (La Grange) in La Riche, the ultimate goal being to close down all the small treatment plants in… +