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Diaphragm Wall

ASC DIAPHRAGM WALL INFORMATIONS

 

 

 

 

Construction of Diaphragm Wall

Diaphragm Wall is generally reinforced concrete wall constructed in the ground using Under slurry technique which was developed in Europe.

The technique involves excavating a narrow trench that is kept full of an engineered fluid of slurry.

Walls of thickness between 300 and 1200 mm can be formed in this way up to a depths of 45 meters.

Diaphragm wall-Application

Commonly used in congested areas.

Can be Installed in close proximity to existing structure.

Practically suited for deep basements.

Used in conjunction with “Top Down” construction
technique.

Introduction
  • Diaphragm Wall is generally reinforced concrete wall constructed in the ground using Under slurry technique which was developed in Europe and ASIA .
  • The technique involves excavating a narrow trench that is kept full of an engineered fluid of slurry.
  • Walls of thickness between 300 and 1200 mm can be formed in this way up to a depths of 45 meters.

Diaphragm wall Application
  • Commonly used in congested areas.
  • Can be Installed in close proximity to existing structure.
  • Practically suited for deep basements.
  • Used in conjunction with “Top Down” construction technique.

Positive facades of Diaphragm Wall
  • Can be Installed to considerable depth.
  • Formation of walls with substantial thickness.
  • Flexible system in plan layout.
  • Easily incorporated into Permanent works.
  • Designable to carry vertical loads.
  • Construction time of Basement can be lowered considerably.
  • Economic and Positive solution for large deep basement in saturated and unstable soil profiles.
  • Can be used for seepage control in Dams.
  • Noise levels limited to engine noise only.
  • No vibration during installation.

Negative Facades of Diaphragm Wall
  • Not economical for small, shallow Basements.

Category of Diaphragm wall

1.     In Situ Cement Bentonite Vertical Wall.

2.     In Situ RCC Vertical Wall.

3.     Precast RCC Vertical Wall.
In Situ Cement Bentonite Vertical Wall

o    Provides water tight barrier.

o    Used to prevent seepage/water loss from Natural reservoir and Dams.

In Situ RCC Vertical Wall

o    Underground Structural element like Metro railway Projects, Basements.

o    Used for Retention systems and Permanent foundation walls.

o    Deep groundwater barriers.

ASC Trenching Equipments

o    Hydraulic Grab.

o    Kelly-mounted or Cable-hung cam buckets.

o    Mechanical Grap

Diaphragm walls provide rigid, cost effective solutions for permanent retaining walls and shafts, with less construction joints than bored pile walls. They are particularly suitable for large, more open sites where structures greater than 25m deep are required.

The Diaphragm walling technique offers improved verticality tolerances to CFA and rotary bored piling, up to 1:400 for Hydrofraise, and delivers a smoother finish. Water tightness is normally delivered using a CWS water bar between the diaphragm wall panels.

Present day methods of constructing diaphragm walls – by using a bentonite powder mixed with water suspension (slurry) to support and stabilise the trench walls during excavation – have been adapted from the drilling techniques employed by oil well engineers.

We have developed a range of construction techniques and components in this field including CWS watertight seals, rope suspended grabs, KS3000 hydraulic grabs for increased production and verticality control, and Hydrofraise reverse circulation excavation rigs (including compact models). This excavating equipment works quickly and effectively through the viscous slurry whilst maintaining accuracy of alignment both vertically and between panels.

For rock and deep walling applications, Hydrofraise drilling machines are utilised. The use of the Bachy Soletanche patented CWS Stop End incorporating a waterbar, ensures maximum water tightness between adjoining panels.

Diaphragm walls are constructed as permanent walls, which reduces the width of construction and working space required when compared to a solution that has both a temporary ground support and permanent works within.

Walls can be made extremely stiff and therefore better resistant to deflection. It is also possible to use effective internal propping with a diaphragm wall rather than the normal ground anchors. Temporary cut-offs can also be created using this  technique.

Etiketler:   diaphragm wall