cairo metro line3 / medinah car park ii cutter excavated diaphragm wall with water bars -45 (60) m...
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Cairo Metro Line3 / Medinah Car Park IICutter Excavated Diaphragm Wall with Water Bars
-45 (60) m
-15 (35) m
0.00 m
Rock(sand)
principal section
wall width:800 (1200) mm
-45 (60) m
-15 (35) m
0.00 m
Rock(sand)
Requirement by the Specs:Water-stop bar, down to approx. 2 m below cut depth
Cairo Metro Line3 / Medinah Car Park IICutter Excavated Diaphragm Wall with Water Bars
BAUER End-Stop / Water-Bar System
Concreted panel
excavated panel
water bar
exposed joint with two water bars system with one or two water bars
PRIMARY PANEL
SECONDARY PANEL
280cm 120cm 280cm
680cm
240cm 20cm20cm
280cm
1 3 2
1
PRIMARY PANEL
OVERCUT LENGTH 20cmOVERCUT LENGTH 20cm
21 3
1
OVERCUT JOINT
11
2211 33
CWS JOINT
WATER STOP
PRE-CAST JOINT
PRE-CASTED JOINT
BACKFILL GRAVEL
STEEL PLATE JOINT
FEMALE PANEL MALE PANEL
STEEL PLATE JOINT
INTER LOCKING PIPE JOINT
SOIL
LOCKING PIPE JOINT
FEMALE PANEL MALE PANEL FEMALE PANEL
STEEL PLATE JOINT STEEL PLATE JOINT
RIGID JOINT
BAUER End-Stop / Water-Bar System
end-stop beams for water-bar system; single water-bar
double water bar
BAUER End-Stop / Water-Bar System
Practical Limits of the End-Stop System
No possibility to install and extract the end-stop beam to depths > 35 (max. 40) m
Rock
primary panel
cut depthmax. depth of stop-end beam:
~ 35m
Execution of Water-Stop System Joints in combination with Cutter excavated DW trench
Rock
1
2
• Waterproof joints in zone 1 (max ~35 m) will be ensured through the installation of water-bar system• Interlocking between the DW panels is achieved due to the shape of the stop-end element form
• No possibility for over cutting in zone 2 • No interlocking of adjacent DW panels• The joints in zone 2 will not be waterproof w/o addtl. measures• Waterproofing may be achieved by means of "Tube a Manchette" Injection behind the joint
Execution of Water-Stop System Joints in combination with Cutter excavated DW trench
• Loosening of the End-stop beam after completion of the whole DW secondary panel excavation and regeneration of the slurry
• Loosening of the beam by means of Vibrating unit and/or chiseling
Execution of Secondary panelconcretedprimary panel
secondary panel
Execution of Water-Stop System Joints in combination with Cutter excavated DW trench
Wat
er s
top
pan
el
• Additional spacers of approximately 2,5 cm shall be installed on both sides of the cutter
• The teeth of the cutter shall not touch the End-stop steel beam
• Concrete on the surface of the End-stop steel form shall be removed by a cleaning chisel
•Additional spacers shall be installed in the upper part of the frame of the cutter in order to prevent tilting W
ater
sto
p S
trip
Primary panel
Secondary panel
spac
ers
Cutter
Working sequence - 3 bites primary panel, 1 bite secondary panel
cutter
primary panelprimary panel Secondary panel
• more end-stop beams are necessary, bigger amount of joints• secondary panels shall be at least 10 cm wider than the frame of the Cutter, to avoid risk of clamping of the cutter in case the water-stop form is not perfectly vertically installed
Working sequence - 3 bite primary panel, 3 bite secondary panel
cutter
primary panelprimary panel Secondary panel
• less End-stop beams required, less joints• no risk of clamping of the cutter even if the water-stop steel form is not vertically installed
Working sequence - 3 bite panels following each other subsequently
cutter
starting panel Adjacent panel 1
• same number of joints and water-stop beams as by 3 bite primary- 3 bite secondary panel working sequence• no risk of clamping of the cutter even if the End-stop steel form is not vertically installed
Adjacent panel 2