1. Diaphragm Wall Construction
Report for
Diaphragm Wall Construction
with BC 40
Jobsite Berlin Lot 1.4
May 1997
prepared by Erwin Stötzer 1

2. Cutter BC 40 2

3. Cutter Details 3 2 1 4 1 guide frame 2 mud pump
3 guide flaps cutter wheels 3

4. Diaphragm Wall Panel Distribution1 4 3 2 5
single primary panel
multiple primary panel
sequence of cutting: bite 1, bite 2, bite 3
secondary panel
primary single bite
primary three bites
primary five bites
corner detail
T - panel 4

5. Guide wall Construction
Stirrup dia 12 mm
longitudinal bars 12 mm
1200mm
700 mm
d + 20 mm
200 mm 5

6. Preexcavation of the Trench
The trench should be excavated at least 3.5m below top of the guidewall to allow the
centrifugal pump of the cutter to start pumping the slurry out of the trench
3.5m
Hydraulic excavator 6

7. Desanding system coarse screen fine screen and cyclon fine screen
remote controll
for mud pump
centrifugal mud pump
desander BE 500
trench with
cutter BC 40
desander 500 cbm/h
6” pipes
tank
centrifugal mud pump 7

8. Pipe Works for Cutter Operation
Quickcoupling dia 6 “
Return line for concreting 4”
charge line during cutting 6”
discharge line for cutting 6”
Charge line during cutting
transport of pipes 8

9. Design of Primary and Secondary elements
primary element
secondary element
cutting joint
temporary spacer for correct position of the reinforcement cage .
to be extracted after concreting the primary element 9

10. Installation of the Reinforcement cage10

11. Reinforcement Cage recesses for anchors lifting beam to unload
from the trailer
Lifting frame
marked lifting points
lifting hooks 11

12. Concreting Primary Element
hosepump HP 50
30 cbm/h
concreting with 3 truck mixer
top endplate to avoid
conrete flow into se-
condary element .To
be withdrawn after
concreting
to desander
H-beam to ensure
correct postion of
the reinforcement
during concreting,
to be withdrawn
after concreting
hose
pump
HP50
guide wall 12

13. concreting primary trench
step 1. installation of H-beam left and right
step 2: installatian cage left and H-beam middle
step3: installation cage right
step 4: remove H-beam middle
step 5: installation tremie pipe middle
step6: installation tremie left and rigth
preperation trench before concreting
3.5 m²/ tremie pipe 13

14. Preperation Primary Element before Concreting1 2 3 5 4
1 cover for trench during concreting
2 temporary spacer for reinforcement
3 fork for tremmie funnel
4 reinforcement hanging at the guide
wall
5 3 nos tremmie funnels for primary 14

15. Tremie System for Concreting
hopper for
tremie system
ball to seperate
concrete from
slurry during
concreting
hopper
tremie pipe
withconnector 15

16. Tremie System for Concreting
tremie pipe rack
hopper
liquid soap for
connector grease
connectors
connector 16

17. Quality Control Bentonite
filling marsh funnel with
bentonite
check time to empty the funnel
required time 45 to 50 sec 17

18. Quality Control Bentonite
measurement the viscosity of the bentonite by the ball harpe method 18

19. Quality Control Bentonite
measurement of the sand content 19

20. Quality Control Bentonite
settling analysis of the bentonite 20

21. Quality Control Bentonite
measurement the specific gravity of the bentonite 21