PREN 1538 : DRAFT 2008

1 Scope
2 Normative references
3 Terms and definitions
4 Information needed for the execution of the work
   4.1 General
   4.2 Special features
5 Geotechnical investigation
   5.1 General
   5.2 Specific requirements
6 Materials and products
   6.1 Materials
       6.1.1 General
       6.1.2 Bentonite
       6.1.3 Polymers
       6.1.4 Cement
       6.1.5 Aggregates
       6.1.6 Water
       6.1.7 Additions
       6.1.8 Admixtures
   6.2 Support fluids
       6.2.1 Bentonite suspensions
       6.2.2 Polymer solutions
       6.2.3 Fresh hardening slurries
   6.3 Concrete
       6.3.1 General
       6.3.2 Aggregates
       6.3.3 Cement
       6.3.4 Water/cement ratio
       6.3.5 Admixtures
       6.3.6 Fresh concrete
       6.3.7 Production of Concrete
       6.3.8 Sampling and testing on site
   6.4 Plastic concrete
   6.5 Hardening slurry
   6.6 Reinforcement
   6.7 Additional inserted products
7 Considerations related to design
   7.1 General
   7.2 Panel stability during excavation
       7.2.1 General considerations
       7.2.2 General principle of design
       7.2.3 Comparable experience
       7.2.4 Stability considerations
       7.2.5 Trial excavation(s)
   7.3 Socketing into rock
   7.4 Reinforcement cages
       7.4.1 General considerations
       7.4.2 Design principles
       7.4.3 Vertical reinforcement
       7.4.4 Horizontal reinforcement
       7.4.5 Multiple cages and joints
   7.5 Recesses and perforations
   7.6 Free flow cover
8 Execution
   8.1 Construction sequence
   8.2 Tolerances
       8.2.1 Panel
       8.2.2 Retaining walls
       8.2.3 Cut-off walls
       8.2.4 Reinforcement cage
   8.3 Preliminary works
       8.3.1 Working platform
       8.3.2 Guide-walls
   8.4 Excavation
       8.4.1 Supporting the walls of the excavation
       8.4.2 Excavation sequence
       8.4.3 Loss of support fluid
   8.5 Cleaning the excavation
   8.6 Forming the joints
   8.7 Placing the reinforcement or other elements
   8.8 Concreting and trimming
       8.8.1 Concreting in dry conditions
       8.8.2 Concreting under support fluid
       8.8.3 Trimming
9 Supervision, testing and monitoring
10 Records
11 Special requirements
Annex A (informative) - Glossary
Annex B (informative) - Control schedules during the execution
Annex C (informative) - Sample concreting record forms for
        diaphragm walls
Annex D (informative) - Bibliography provisions
Annex E (informative) - Degree of obligation of the provisions

Describes the execution of diaphragm walls as both retaining and cut-off and the practical aspects which shall be taken into account in the production of the working drawings.