Post on 16-Jul-2015
8Th November 2008
U Kyaw Linn
Managing Director
Public Works
Ministry of Construction
Desanding
• တြင္းူးြ ူးး ပ ူးလ ိုအပ္ေးသာအနက္ေးရာက္လ ွ်င္ တြင္းူးြ ူးး ငင္းူးလိုပငနန္းူးက ို
1:30ငန္႕ ရပာ္ူးး ပ ူး bentonite း ဖင္း ထ ိုင္ေးေနသာအနယ ွ်ာူးး ကိုး
ေးး ဖူးညင္းူးစ ာငပယူရမည္။ ထ ိုေ႕နာက္ကြ င္ငြင္းူးထရဲ း bentonite
အနယ ွ်ာူး်ားႏး င္း သြဲ ို႕က ို desanding း ပဳ လိုပ္း ငင္းူးး ဖင္း
ငစဲးထိုြ္ေးပူးရမည္။
• Desanding း ပဳလိုပး္ ငင္းူးဆ ိုသည လာ desander
က္း ဖင္း တြင္းူးအတြင္းူးမ bentonite
း်ားႏး င း္ေးရာေးး်ားႏး းာေးေနသာသ်ဲားႏး င း္ အနညအ်ားႏး ွ်ာူးက ို ငစဲးထိုြက သန္႕ င္
တသာူးေးသာ bentonite က ိုတြင္းူးအတြင္းူးသ ို႕ ပန္ထည္း ေးပူးး ပ ူး
သ်ဲားႏး င း္အနညအ်ားႏး ္ မွ်ာူးက ို အ ပင္ ို႕စ န္႕ထိုြ္ေးပူးး ငင္းူးး ဖ ္ည္။
သ ို႕မ သာ တကန္ကရ ္ေးလာင္းူး ေးသာအငါ ေးအာက္ေးး ငတြင္
သ်ဲားႏး င း္အနညအ်ားႏး ွ်ာူးကင္းူးေးးူးေး ပါမည္။
Desanding
Copressed Air
Disposal material, sand
and other impurities
Desander
Air compressor
Purified bentonite
To minimum damage to cages
during reinforcement fitting it is
necessary to follow the procedure
indicated in Fig.
1. used of a purpose-made lifting
beam
2. welding of 25 mm steel lifting
lugs to the top of the cage cages
and
3.welding of at least of 3 binders
within the cage to each main bar
The reinforcement cages should be
prepared as shown in Fig.
-Check the spacing bar are sufficient to ensure
minimum concrete to steel and that the cage is
correctly dimensioned (100 mm cover)
-Lower the c age un t i l i t s top s tee l i s
approximately 1 m above the top of the casing.
-Put two short 3 m length steel beams such as
rail through reinforcement beneath a binder hoop
of the cage to rest across the top of the casing.
-Lower the cage onto the beams and ensure that
the support is strong and secure.
-Remove the lifting beam and cut off lifting lug
f r o m t h e i n s t a l l e d c a g e .
-Lower the next cage onto the installed cage.
-Ensure overlap is 45 times the main bar
diameter.
-Weld together a min imum of 10 main
(longitudinal) bars, each 200 mm length.
-Lift joined caged sections to take out of the
supporting beams.
-Lower to correct level or to 1 meter below the
top of the next cage for next installing sequence.
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2 Nos. Of Rail 2.5 m long
Stiffener ring
With thin sheet rounded
Hook
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Tremie Pipe
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q i f N y D ; T r e m i e p i p e r s m ; u d k
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uGma&mufatmifcHay;&rnf/
Platform
Tremie Pipe
Hopper
Platform
Tremie Pipe
CEMENT TEST RESULT
PROJECT - BRIDGE
TYPE OF CEMENT - ORDINARY PORTLAND CEMENT
CEMENT BRAND - HORSE - HEAD BRAND
Sr No Test Information Test ResultsStandard Specification
BS: 12:1958 BS : 12: 1978
1 Setting Time
(a) Initial Setting Time 1 hr : 25 min < 45 min < 45 min
(b) Final Setting Time 3 hrs > 10 hrs > 10 hrs
2 Compressive Strength
(motar Cube)
at 3 days (average) 2480 p.s.i min : 2200 p.s.i min : 2200 p.s.i
at 7 days (average) 3685 p.s.i min : 3400 p.s.i
3 Fineness
Retained on B.S Sieve 6% max : 10% max : 10%
No. 170 (average)
Sieve
(mm)
9.52
4.76
2.40
1.20
0.60
0.30
0.15
Grading Requirements for F/A (A.S.T.M Standard C 33.92 a)
Percentage by weight passing sieve
Test Grading
Grading Requirements
100.00 99.7
95-100 97.7
80-100 80.0
50-58 47.8
2-10 -
25-60 13.2
10-30 3.2
Sr Specification
No BS. 3148/1980
1 pH 6-8
2 Turbidity (NTU)
3 Chloride (as NaCL) > 500 ppm
(ppm)
4 Alkali Carbonate > 1000 ppm
(as CaCo3) (ppm)
5 Alkali Bicarbonate > 1000 ppm
(as HCO3) (ppm)
6 Sulphate > 1000 ppm
(as SO4) (ppm)
7 Dissolved Solid > 1000 ppm
(ppm)
8 Ca Content (ppm) -
9 Mg Content (ppm) -
Apperance
Water Specification
Cube Test
Ready to start
Sonic Integrity Test
Concreting
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a v m i f ; r D T r e m i e p i p e
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onfa&ay:odkUay:vmvsif?Tremie pipe
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C o n c r e t e a v m i f ; v m í T r e m i e
pipewpfqifYtm;jzKwf&efvdktyfvmyguTremie
Pipe atmufajconf ConcretetxJütenf;qHk;1.5 m
& S d a e a t m i f q G J x k w f N y D ; r S w p f
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Not less than 0.5 meter
Plastic Ball
Insert of tremie pipe is atleast 1.5m
Concrete bucket
Tremie pipe hopper
Plat Form
Pulled Out Of Stand Pipe
ESKwfaomtcg Boom ESifY Vibrohammer rxdap&yg
Vibrohammer jzifY Stand pipe tm; concrete
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When stand pipe rest on the bed
Cut off here
Pull Out Of Stand Pipe
Vibrohammer
Advantages Of R.C.D
• Perform speedily
• Low noise and low vibration
• Pile diameter is large and a deep pile is performable
• Suitable to under water performance too
• The rotary table and main body are separately opera
tables
Disadvantages Of R.C.D
• May be unsuitable for a case where is cobble stone are biggest than
drill pipe
• Poor management of performance causes collapse of hole wall
• Loosened foundation at pile tip
• Loosened ground around pile
• Lowered quality of concrete due to poor management
• Lowered bearing power due to imperfect removal of saline (Salary)
• Difficult disposition to mud–water and waste soil
But,
These disadvantage are controlled by the quality of
performance management
Drill Bit
Drilling pipe
Jet pipe(Jet nozzle)
Air pipe
Stand pipeExcavated material
Kelly bar Delivery hose
Air hose
Rotary table
Injected Air
Excavated Material
Air Lift Type
S 320
Air Compressor
Air HoseWorking Bench
Crane
This method is applicable when the drilling rig is used as air lift drill. Air is
injected from a compressor through a swivel joint. (An air drill pipe and jet nozzle are
used). The S 320 main body uses a hydraulic pump for driving the rotary table without
employing a suction pump, vacuum pump, etc.
Water is drained directly from the swivel joint to the water tank.
Water tank
Pump Suction
Submersible pump
Water tankS 320
Hose
Rotary table
Working bench
Crane
This method is general used. There is no wall surface breakage due to
vibration of rotary table. The water tank is connected with the stand pipe through
a hose. Water is supplied with a submersible pump. The water level in the stand
pipe can be adjust easily by submersible pump in water tank.
Air Swivel
Kelly Bar
Rotary TableStagging
Bentonite In Put Pipe
Delivery hose
Air Hose
Tremie Pipes
Deposited material and
bentonite are delivered to
sentimental tank
Working bench
Thank You!
For Your Attention
U Kyaw Linn
Managing Director
Public Works
Ministry of Construction