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