This presentation outlines the 16 step process for constructing a well foundation on a bridge, from geotechnical investigation to the top plug. The key steps include: 1) Conducting a geotechnical investigation to understand soil conditions. 2) Surveying and laying out the well locations. 3) Fabricating and installing the cutting edge and brackets that will form the base of the well. 4) Reinforcing and casting the well curb section below ground. 5) Sinking the well curb using a grabbing method. 6) Constructing and sinking the reinforced well steining section. 7) Pouring the bottom and top plug concrete sections to complete the well foundation.

1. CONSTRUCTION OF WELL FOUNDATION ON
CHAMBAL BRIDGE (1282/1)

2. This presentation cover the constructionof well foundation from
Geotechnical investigation to Top plug of well foundation
Step wise operation and activities as follow:-
1. Geotechnical Investigation
2. Survey work
3. Fabrication of cutting edge
4. Placing of cutting edge
5. Fabrication of brackets
6. Installation of brackets on cutting edge
7. Cutting, bending and fitting of plate
8. Reinforcement work of well curb
9. Casting of well curb
10. Sinking of well curb
11. Shuttering and Reinforcement work of well steining
12. Casting of well Steining
13. Sinking of well steining
14. Bottom plug
15. Sand filling
16. Top plug

3. Geotechnical Investigation
Geotechnical investigationwork is carried out at every pier location of bridge to
know the strata below the bed level to find Engineering propertiesof soil.

4. GEOTECHNICAL INVESTIGATION ON GROUND

5. FIELD SURVEY WORK
• The survey work is carried
out by taking reference from
existing bridge and setting the
TBM near to existing bridge .
• The center line marking of
proposed bridge using total
station.
• Control points and TBM are
marked.
• Center of each well
foundationis marked by peg
• OGL of proposed well
foundation is taken.

6. VIEW OF EXISTING BRIDGES

7. SETTING OUT LOCATION AND
LEVELING WORK
•Location of proposed
well foundation are
located by Total Station
with pre-define
coordinates.
• Original ground is level
by leveling equipment.

8. FABRICATION OF CUTTING EDGE
Cutting Edge is fabricated
in fabrication yard consist
of plate of 25mm and
angle of 150*150*16 size
and a bent plate of 12mm.
Type of welding used are
MAW and GMAW.
Cutting edge is fabricated
in 5 parts.
2 round part (D type)
2 straight
1 intermediate

9. PLACING OF CUTTING EDGE
•The location is marked by
coordinated system before placing
of cuttingedge .
•Wooden blocks are provided on
level ground.
• Cuttingedge is placed with the
help of mobile crane (hydra)on
wooden block.
• After placing on wooden blockit
is tie by temporaryarrangement by
channels.
• After fixingto exact location
welding is done on joint of
prefabricatedpart
(5 parts)of cuttingedge.

11. FABRICATION OF
BRACKETS
• Angle of size75 mmX75 mmX8 mm
are cut to required length.
• Assembling of angle is done as per
drawing.
•Welding is done on joint..
•After welding dye penetration test is
conduct.
•Final Dimension is checked then it is
transferred to site for fixing with
cutting edge .

12. INSATALATION OF BRACKET
ON CUTTING EDGE
• Prefabricated brackets of angle size
75*75*8 areinstalled on cutting edge
•After installation welding is done at
joint of cutting edge and brackets.
• Alignment and verticality of brackets
is checked at every stage.
• Spacing is also checked at every
stage.

13. CUTTING BENDING AND
FIXING OF SKIN PLATE
• Cutting of plate done on level ground
as per requirement .
• it is then bend in bending machine
to required angle .
• Then it is transfer to site where it is
fixed on cutting edge and bracket
assembly with the help of crane
•Welding is done on joint of plated by
making suitable groove.

15. TESTING ON WELDING
• Welding joint is clear by wire
brush to removeSlug and dirt.
• Cleaner is applied on welding
joint .
•After cleaner penetrator is
applied.
• After penetration of penetrator
in welding Developer is applied .
• After application of developer
pin holes are detected if any and
rectification is done the same.

16. REINFORCEMENT FIXING
WORK IN WELL CURB
• All the steel bars arecut to required cutting
length
• Hoop bars are bend in required Diameter.
• Vertical bars threaded at one end to tie it
with cutting edge as per drawing
• Initially stirrup arefixed in fabricated well
curb at required spacing .
• Then Hoop reinforcementareplaced.
• Link bars arebind with hoop reinforcement.
• Then verticals are fixed at required spacing

17. CASTING OF WELL CURB
• Casting of well curb done by M35
gradeof concrete
• Concrete is transported fromRMC
batching plant to site by transitmixer
• concrete fromtransitmixer is
pumped through concretepump to
pouring location.
•Beforepouring slump cone test
performin order to check the
workability of concrete
• Concrete laid in layer of 300mm
thickness.
• Concrete compacted through needle
vibrator.

18. SINKING OF WELL CURB
• After casting of well curb sinking
operation is proceed to sink the well
curb below bed level.
• Sinking is done by Grabing method
with dredging soil inside dredge hole .
the help of crane.
•Regular sump, tilt and Shift is checked
to maintain the stability of well.

19. SHUTTERING OF WELL STEINING
• Shuttering plate is prepared by
cleaning dust and stick material by
wirebrush.
• Shuttering oil is applied on shuttering
plate
• Joints are closed by foam.
• Plates are fixed on well curb in
required dimensions
• Alignment is check after fixing of
plate .
• After checking the dimension and
alignment plate are tied by nut bolt
system
• Wire ropes are tied around the outer
Shuttering .
• Inner D is fixed by Channel assembly
• To maintained the thickness of well
steining channels are in between inner
and outer shuttering plates .

20. REINFOREMENT WORK OF
WELL STEINING
• Reinforcementbars are cut to
required cut length.
• Vertical bars arethreaded for fixing
the mechanical splices for lapping
purpose.
• Inner and outer hoop reinforcement
are fixed with vertical bars.
• Tie bars are fixed with inner and
outer hoop reinforcementas per
drawing.

21. CASTING OF WELL
STEINING
• Casting of well steining done by M25
gradeof concrete
• Concrete is transported fromRMC
batching plant to site by transitmixer
• concrete fromtransitmixer is
pumped through concretepump to
pouring location.
•Beforepouring slump cone test
performin order to check the
workability of concrete
• Concrete laid in layer of 400 mm
thickness.
• Concrete compacted through needle
vibrator.

22. CURING OF WELL
STEINING
• After casting of well steining
deshuttering operation processed
• Then Curing is done by wrapped the
hassion cloth

23. SINKING OF WELL STEINING
• After casting of well steining sinking
operation is proceed to sink the well
below bed level.
• Beforestart of sinking gauge marking
is done on all 4 side of well
• Sinking is done by Grabbing method
with the help of cranefromdredged
hole .
•Regular sump, tilt and Shift is checked
to maintain the stability of well.
• If tilt and shift is out of limit then
rectification is also operated .

24. COORECTION OF TILT AND
SHIFT
• Due to sinking operation sometime
tilt and shift get out of permissible limt
• Then correctivemeasuretaken on
the well by providing suitable
arrangement
• In our project well P8 get rectified by
apply kantledge load on well in one
side and supportof prefabricated
compositesection on another side by
laid PCC below it.
• By this method excess tilt get
rectified .

25. BOTTOM PLUG OF WELL
FOUNDATON
• After sinking of well till required
depth i.e. uptp founding level bottom
plug is done upto a hieght of 300.mm
abovethe top of well curb
•In bottomplug grade of concrete used
is M20
• For preparation of bottom plug the
loose soil is dregdeout fromwell and
sump is checked below FDL.
• In bottom plug tremie pipe is used
to pour the concretein each D
• In bottom plug extra 10 % cement is
used for under water concrete

26. SAND FILLING OF WELL
FOUNDATION
•After bottomplug next step is to fill
the remaining dregde hole by sand .
• Sand filled in well is free fromorganic
material
•Itshould be clean and washed
• water to be poured to achieve full
compaction

27. TOP PLUG
•Top plug is done after sand filling in
dregdehole .
• Beforetop plug we haveto ensure
that sand filled is fully saturated so full
compaction can be achieved of sand.
• Height of top plug is 500 mmabove
sand filled
• In top plug gradeof concreteis M20

28. THANKYOU
Dilip Patidar
Site Engineer /RVNL