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Diaphragm walls

Diaphragm Walls

Another form of retaining wall is the diaphragm wall system.

Trench thickness from 600mm to 1500mm by 2800mm long.
Trench depth up to 75 metres using 150 tonne to 170 tonne rig working capacity

Applications

The most popular use of a diaphragm wall is for the construction of multilevel basements and for top –down building construction method. The trenching process of this diaphragm wall system is aided by bentonite fluid support. During the excavation process bentonite is introduced and recycled during the construction process. Bentonite is used during the excavation process to facilitate the removal of the cuttings when using the trench cutter, until reaching desired depth. This is later replaced by placing concrete in the trench via the tremie method. Bentonite is returned to holding tanks on site to undergo treatment and reuse. 

The diaphragm wall system is a fantastic solution compared to any other conventional retaining wall systems because of increased water tightness by minimizing vertical joints. The use of the diaphragm wall system is to alleviate issues in constructing underground tunnels along heavy public presence, deep basements without endangering the stability of the foundations of the nearby buildings. Diaphragm wall system can be applied to water storage, sewage disposal shafts, security vaults, pits, and wharves, containment of contaminated area and control of toxic effluents travelling underground.

Diaphragm wall ancillary structure comprises of de-sanding equipment, silos, holding tanks, transfer pumps, mixer tanks and compressors.

Advantages

  • Ideal for top down construction projects.
  • Can be installed in virtually all soil conditions including high strength rock.
  • Reduced noise and vibration compared with other shoring techniques such as sheet piling.
  • Very accurate method of construction with high tolerance levels.
  • Removes the requirement for dewatering the site.
  • Can be used in the immediate vicinity of existing buildings.
  • Can be designed to carry structural loads thereby reducing the foundation costs.

5-7 Charles Street Parramatta DWall

  • LB 8100-02 excavating at Parramatta

Project Outline

The project is a mixed used residential and commercial building with 5 basements to be developed by GFM Investments.

Scope of Works

Avopiling Australia Pty Ltd was contracted to undertake the design and construction of the temporary works to maintain the integrity of the wall structure with the installation of 96No PU18 sheetpiles.x 8.00 metres long and the design and construction of the perimeter basement retention wall made of 640 mm wide diaphragm wall panels x 21.00 metres deep.

M6 Stage 1 C2 Shaft and Cut and Cover

  • MC64's cutting and grabbing
  • Bentonite Plant

Project Outline

Construction of M6 Stage1 Project is by CPB Ghella UGL JV. The M6 Stage 1 connects President Avenue at Kogarah to the M8 at Arncliffe.

Scope of Works

Avopiling Australia Pty Ltd scope is to construct the C2 Shaft and the Cut and Cover section. The C2 shaft consist of 8 diaphragm wall panels 1000 mm wide to depth of 38.00 meters. The cut and cover section is made up of a 80No diaphragm wall 1000 mm wide to depths of 30.00 metres and a secant pile wall with a combination of 106No CFA and 102No bored piles using segmental casing to depths approximately 24.00 meters and 27No barrettes 1000mm wide x 35.00 meters deep.

330 Church St, Parramatta, NSW.

  • Bulk Excavation Level reached
    Bulk Excavation Level reached
  • Excavation well under way
    Excavation well under way

Project Outline

Diaphragm Wall Construction for the proposed residential development at 330 Church Street, Parramatta, NSW. The proposed development will comprise two residential towers over a common podium level and four levels of basement carparking over the main rectangular portion of the site with the footprint of the basement extending to the eastern, western and southern boundaries, and set back between about 9m and 12m from the northern site boundary. The site is located within near level terrain on the south bank of the Parramatta River. Bulk excavations to a maximum depth of about 12m below existing surface levels to be carried out following the completion of the Diaphragm wall.

 

The work was carried out for Karimbla Construction Services Pty Ltd (Meriton Group)

Scope of Works

Design and construction of the diaphragm wall system with two rows of temporary rock anchors through the wall, which include:

 

Diaphragm wall: 49 panels x 640mm wide x 2800mm-7000mm length x 12m–13m depth

Temporary anchors: 2 rows x 243 rock anchors x approx. 14m-23m length

 

Works include:

  • Design works for the diaphragm wall.
  • Removal of 40 existing old reinforced concrete piles from the location of the diaphragm wall.
  • Design and construct Guide Wall.
  • Supply and installation of  all concrete,  reinforcing steel,  anchor blockouts and couplers.
  • Supply and installation of Inclinometer system.
  • Design, install and test all anchors.
  • Installation of standpipe piezometers and monitoring of groundwater levels.
  • Monitoring the performance of the southern boundary shoring using the inclinometers and survey monitoring points.
  • De stress the temporary anchors.

 

Concrete used: 50MPa for DW panels (volume 2,650m3)

                             25MPa for Guide Wall (volume 370m3)

Reinforcement: 200 ton

Project examples

5-7 Charles Street Parramatta DWall

5-7 Charles Street Parramatta DWall

NSW
The project is a mixed used residential and commercial building with 5 basements to be developed by GFM Investments.

Project examples

M6 Stage 1 C2 Shaft and Cut and Cover

M6 Stage 1 C2 Shaft and Cut and Cover

NSW
Construction of M6 Stage1 Project is by CPB Ghella UGL JV. The M6 Stage 1 connects President Avenue at Kogarah to the M8 at Arncliffe.

Project examples

330 Church St, Parramatta, NSW.

330 Church St, Parramatta, NSW.

NSW

Diaphragm Wall Construction for the proposed residential development at 330 Church Street, Parramatta, NSW. The proposed development will comprise two residential towers over a...

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