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Diaphragm Wall [ DW ] is a technology carried by Foundation Specialists. Diaphragm Wall can be designed and executed as a reinforced
concrete retaining structure, in which case it will also be called “ Cast In Place Reinforced Concrete DiaphragmWall “. Diaphragmwall is a “Top-Down Construction Technology” employed for Excavation Support in difficult soil conditions or
whenever deep excavation has to be carried out in an environment where zero disturbance of the surroundings, including avoidance
of water table lowering, and/or zero settlement of neighboring structures are a requirement. DiaphragmWall is put in place using a segmental installation
technique, [Primary and secondary DiaphragmWall Panels of predetermined dimensions installed by following a proper sequence] purposely
and specifically designed for each soil formation and particular site requirements, in order to avoid any disturbance and
subsidence to the surrounding areas. In cohesionless
soil formations under the water-table, the segmental excavation of Diaphragm Wall is generally carried out using bentonite suspension as the drilling fluid, in order to balance the action of the water-table
and to maintain the excavation of the Diaphragm Wall perfectly stable until each single “ Panel ” is cast with concrete. Once all the segments or “ Panels “ of the DiaphragmWall are cast, they are connected at the top by a reinforced concrete continuous beam [ Coping ], after which, removal of
soil on the excavation side can proceed, protected by the Diaphragm Wall. The DiaphragmWall, depending upon depth
of excavation and upon design loads to be applied on the “ earth side “ can be designed to act as a cantilever
Diaphragm Wall or as an anchored DiaphragmWall, in this last case, soil or rock anchors shall be drilled, installed and generally post tensioned, at one or more levels
of the DiaphragmWall (as per design), when excavation reaches the required elevations. Diaphragm Wall is sometime called Slurry Wall. An other type of DiaphragmWall carried by Foundation Specialists is a Technology called Cut-Off Wall or Self-Hardening Plastic Cut-off Wall . The Cut-Off Wall is a continuous and impermeable Diaphragm Wall, generally made using a mix of Cement+Bentonite, designed to remain indefinitely, both
sufficiently plastic in order to follow soil movement and deformation without cracking and totally impervious. DiaphragmWall and Cut-Off Wall are employed whenever there is a requirement for isolating a source of pollution from the
surrounding water table, e.g. around Sanitary Landfills or other source of polluting lechates. DiaphragmWall technology is used in Dam Construction to achieve water--tightness in the soil or rock formations underlying
the main dam or the cofferdams, whenever grout curtains alone can not guarantee the needed results, as
in the case of Dams or Cofferdams with underlying karstic limestone formations. DiapragmWall are employed to build river training walls, because Diaphragm Wall can be built sufficiently deeper than
the maximum local scouring depth , thus assuring zero collapse chance for the river dykes due to under-scouring
during heavy floods. The
DiaphragmWall construction technology is also used to build deep continuous catching drains, when the deep trench is filled either with
gravel or pervious concrete. Barrettes or Barrette-piles, cast in place rectangular piles are a technology that uses the same equipment employed to execute the Diaphragm Wall. DiaphragmWall equipment and technology are used also to execute special design Pile-Column for large loads in Top-Down construction schemes.
DIAPHRAGMWALL.info Foundation Specialists [FS ] was formed in the 1970s by merging and consolidating
into It two Partnerships with solid background and successful accomplishments in the Engineering and Management of Large International Infrastructure Projects. The two Concerns that were merged to form Foundation Specialists, had, over the years dedicated to develop
and manage the planning and construction of large Underground Hydropower Schemes, including
Pump-Storage Hydropower Plants, in difficult geological and geomorphological conditions. managed through theoretical and field
R & D to fine tune field applications of Geotechnical and Foundation Engineering, Soil and Rock Mechanics and develop
Construction Methods and Technologies applicable to general conditions. Because of the way it was formed, Foundation Specialists started “ab initio” as a
leader in its consolidated fields of expertise, i.e. large, complex infrastructure projects with important foundation-engineering-related
components. |
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Clicking the following link you will enter the HOME page of FoudationSpecialists
main website
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