(Extracted from Sambo Catalogue unless otherwise stated)
A typical snap shot of a diaphragm wall construction site. The cylindrical steel tanks are for storage of bentonite slurry.
Equipment for diaphragme wall construciton: bentonite, mixer, desanding..., for a reverse circulation system
Schematic circulation system (from Bauer catalogue)
|1. Install guide wall||2. Trench excavation and deposit soil to a holding tank|
|3. Install rebar cage||4. Checking verticallity by Coden Test|
|5. Tremie concrete||6. Disposal of excavated soil from holding tank|
Stop end sheet pile fabrication for holding up waterproofing rubber band
Construct guide wall (about 1.5 to 2m depth and 0.4m wide). Normal shape like ¬ to form half of the guide wall. Guide wall is not only used for D wall machine excavation, but also servers as working platform duration D wall operation.
Pre-excavation to clear surface and shallow (up to 10m deep) obstacles of a panel trench by a hydraulic grab
Trench excavation by a mechanical grab (clamshell grab). For excavation into hard soil at deeper level, cutter or drilling bit is to be used. Typical panel is 3-6m in length.
Trench excavation in progress (DTL2 Little India Station)
Install rebar cage
Install upper part of rebar cage to join the lower one
Tremie concreting. Bentonite is being pumped back to the recycle system.
There are three joint types: the conventional stop end tube or sheet pile, and the overlap cutter joint.
|1. Fabrication of end plate||2. Join 2 end plates|
|3. Attach waterproofing rubber band to the plate||4. Install end plate|
Stop-end sheet pile attached with waterstop: work sequence
Stop-end plate: plan
Stop-end plate: Fabrication
Stop-end plate: close view
Overlap cutter joint
Piling and Diaphragm Wall Machines