Categories for Underground works

SADE takes off with ADP…

3 May 2023
…by obtaining France’s largest pipeline order in recent years. The SADE (SADE Special Works and Île-de-France RD) – EHTP – SETEC HYDRATEC and CABINET MERLIN consortium recently won its bid for a 30-month design-building order from the ADP Group (formerly Aéroports de Paris). ADP Group’s Marne project consists in the laying of a stormwater transfer pipeline from Paris-Charles-de-Gaulle airport to the Marne river. The pipeline path, which runs for some 9km between the municipalities of Gressy and Annet-sur-Marne, will enable the gravitational evacuation of water. Led by SADE Special Works (agent), this complex project combines… +

Surgical precision in Montpellier…

28 February 2023
…to protect the hospital from flooding. Montpellier’s university hospital (CHU) encompasses several sites, including Lapeyronie Hospital, which owes its name to King Louis XV’s surgeon. Located downhill from natural terrain, it flooded regularly in heavy rain and required securing. The CHU thus launched large-scale works, entrusted to SADE. Protective measures in a high-risk context To begin with, the competent authorities initiated emergency works: Building of an embankment along the hospital site Raising by 3.5m of three access points to the hospital (car park, staff entrance, etc.) Laying of a stormwater collector A new phase entrusted to… +

Transport infrastructures for the Grand Paris Express

16 February 2023
After Boulogne, Villejuif Louis-Aragon and Créteil l’Echat, SADE is continuing its work! Line 15 Line 15 is an underground metro line (75km) which runs throughout the Greater Paris metropolitan area and forms an outer ‘ring road’. Its aim is to decongest the public transport networks and provide an efficient service to the departments surrounding Paris, by forming a regional network alongside the existing transport services. It thus offers the possibility to travel from suburb to suburb without having to transit via central Paris. This ‘ring road’ consists of three sections, including Line 15… +

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… +

Rehabilitation of an SNCF drainage collector

12 January 2023
Using the Bluelight® technique, particularly adapted to limited-access networks. In Ablaincourt-Pressoir, the defects observed during compulsory periodical inspections of the drainage collector (250mm-diameter and 3m deep) along the high-speed train line called for the rehabilitation of this collector. SNCF decided to use these works, executed by the Non-Inspectable Rehabilitation team from SADE Special Works, as a test project. The solution requested by SNCF was to sheathe the existing drain to maintain its transport function and to place a new shallow drain on the ground level. SADE teams set to the task, beginning with the waterproofing of the collector, then sheathing… +

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… +