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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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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C o n c r e t e a v m i f ; v m í T r e m i e

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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

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Vibrohammer jzifY Stand pipe tm; concrete

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oGm;vsif Stand pipe

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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