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Diaphragm wall barrettes

Diaphragm wall barrettes are rectangular cast in-situ concrete foundation elements that can be installed up to great depths (approx. 60 m).
Dimensions are related to the dimensions of the diaphragm wall grabs, e.g.widths of 600, 800, 1000, 1200 and 1500 mm; lengths of 2800, 3000 and 3200; other dimensions are possible by joining multiple sections.
Very well suited for transferring large concentrated foundation loads (30 MN is feasible) into the subsoil. The excavations are made using a rope operated heavy-duty grab. The stability of the bore hole is maintained by applying bentonite in the excavated hole.
To guide the grab and stabilize the toppart of the barrette a guide frame is placed into the soil over the first couple of meters.

After cleaning, the rebar cage can be positioned and concrete can be poured. This is domne using a tremie pipe in order to fille the wexcavation from the bottom. During the concrete pouring the tremie pipe is shortened and the bentonite is pumped away. Before curing of the concrete can occur the guiding frame is removed from the top of the pile.

 

Application

These piles are used for transferring large concentrated loads at larger depths, such as for tall office buildings, silos, bridges and viaducts. They can also be used as a substitute for multiple piles underneath a column base.
Top-down construction is possible by combining bored piles with prefab concrete columns or steel sections.

Ambient factors

  • The equipment that is needed and the resultant footprint are relatively large. These include a bentonite plant, vehicles for transporting the concrete to the pile, and storage area for the rebar cages
  • Can be realised with limited clearance (6.0 m).
  • Vibration-free and low-noise.

Pros and Cons

  • Capable of absorbing very high loads.
  • Bentonite and soil must be processed and removed.
  • Hard layers of soil or boulders can be penetrated using special teeth on the grab.
  • Work can be carried out close to adjacent structures and foundations.

Applicated

Name of project

Client

Den Haag, Foundation Cultural Centre

Construction consortium Cadanz

Bergambacht, Embankment reinforcement Bergambacht-Ammerstol-Schoonhoven

Waterauthority Schieland - Krimpenerwaard

Rotterdam Maasvlakte, Barettes Coal Silos EMO

Visser & Smit Bouw

Rotterdam Maasvlakte, Foundations Site Centrale

Visser & Smit Bouw

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