Creation of guard gate

To combat the silting up of the dock in the private port of Cergy, our Paris-based team was tasked with installing a guard gate at the canal's entrance.
It allows boats through when open.

It prevents the dock from silting up when closed.
This project involved a wide range of skills, from dredging to sluices, pile driving and civil engineering.
A construction site only accessible by water. 
 

Project

Client: ASL Port Cergy
Prime Contractor: ISL Ingénierie
Duration of wors: July 2020 > February 2021
Amount: €2,760,120

 

Distinctive features and constraints 

• Works carried out solely by water route
• Severe environmental constraints
• Construction site with multiple activities: civil engineering, pile driving, underwater excavation
• Pumping concrete over a significant length. Dual pump concreting with one on dock.

 

Description of works

• Building a cofferdam in sheet piling
• Underwater excavation
• Placing an end seal in immersed concrete
• Providing the civil engineering for a guard gate
• Placing riprap masonry

 

Main quantities

• 125 T sheet piling
• 180 m3 dredging
• 360 m3 concrete
• 265 lm berm in riprap