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
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.
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)
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:
Concrete used: 50MPa for DW panels (volume 2,650m3)
25MPa for Guide Wall (volume 370m3)
Reinforcement: 200 ton
Diaphragm Wall construction for Stage 4 (Project 145) for a fourth Dump Station and associated conveyor infrastructure at the Port Waratah Coal Services (PWCS) Kooragang Coal Terminal (KCT).
The work was carried out for Bechtel on behalf of PWCS.
The project included the following relevant elements:
A conveyor exits the base of the dump station through a tunnel which slopes up to a surface exit point about 200 m to the east and was constructed using a similar methodology to the main dump station.
All construction associated with the diaphragm wall system and supporting base plugs (jet Grouting Plug) between the walls for both the dump station and the tunnel.
Dump Station area was divided by cross DW panels into 3 cells. Tunnel area was divided by (Jet Grouting) cross cut-off walls into 4 equal cells.
Dump Station
No. of Cells: 3
No. of Diaphragm Wall Panels: 25
Size of Panels: 11nos.x800mm wide x (2800mm-7000mm) length x 20m-28m depth.
24nos.x640mm wide x (2800mm-7000mm) length x 14m-21m depth.
Tunnel
No. of Cells: 4
No. of Diaphragm Wall Panels: 48
Size of Panels: 48nos.x640mm wide x (2800mm-7000mm) length x 11.3m-17m depth.
Works include:
Concrete used: 40MPa for DW panels (volume 4,673.8m3)
25MPa for Guide Wall (volume 476.2m3)
Reinforcement: 522.75 ton
Located at the heart of Brisbane’s exclusive riverfront setting and the Central Business District (CBD), this iconic and modern building is centrally located with a wide range of amenities and services, both within the building and close by as well as being on the door step of the well established Riverside Precinct.
Design and construction of Diaphragm wall (83m of guide wall and 1200m3 of diaphragm wall) total number of 27 panels 640mm x 2800mm, the max excavation depth 24m. Up to 10m of rock cutting, in excess of 220Mpa.
Diaphragm Wall Construction for the proposed residential development at 330 Church Street, Parramatta, NSW. The proposed development will comprise two residential towers over a...
Diaphragm Wall construction for Stage 4 (Project 145) for a fourth Dump Station and associated conveyor infrastructure at the Port Waratah Coal Services (PWCS) Kooragang Coal...
Located at the heart of Brisbane’s exclusive riverfront setting and the Central Business District (CBD), this iconic and modern building is centrally located with a wide...
