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III. Manhole Constuction

all formworks ,rebars,entrance step and manhole fra
Pour concrete for manhole entrance

Uninstall formworks for manhole entrance
Backfill and Restore the road surface
Install manhole cover

Install cable racking pole for 115 KV.

Install manhole grounding



III. Manhole Constuction

all formworks ,rebars,entrance step and manhole fra
Pour concrete for manhole entrance

Uninstall formworks for manhole entrance
Backfill and Restore the road surface
Install manhole cover

Install cable racking pole for 115 KV.

Install manhole grounding

manhole cover

BEFORE

AFTER

III. Manhole Constuction

all formworks ,rebars,entrance step and manhole fra
Pour concrete for manhole entrance

Uninstall formworks for manhole entrance
Backfill and Restore the road surface
Install manhole cover

Install cable racking pole

Install manhole grounding

III. Manhole Constuction : The span between
racking pole should not exceed 1.5 m. or
other which PEA had approved

22 kv.
69,115 kv.

69,115 kv.

III. Manhole Constuction
: racking pole

III. Manhole Constuction : pillow insulator
,Cable hangersteel , round bar

22 kv. 69,115 kv.







III. Manhole Constuction

all formworks ,rebars,entrance step and manhole fra
Pour concrete for manhole entrance

Uninstall formworks for manhole entrance
Backfill and Restore the road surface
Install manhole cover

Install cable racking pole for 115 KV.

Install grounding for manhole

III. Manhole Constuction : Conductors,PVC
insulated Cu 1x50 sq.mm



DB 25 mm. @
200 mm #
SD 30 , SD 40

ป RB 6 mm. @
610 mm
SR 24

คอนกรตี ผสมเสรจ็ กาลงั รบั นา้ หนัก
fc’=180 ksc (cylinder)
fc’=240 ksc (cubic)

Trenchless methods

Typically the method is used in environments
where open trench digging is impossible or

not feasible.

IV. Horizontal Directional Drilling(HDD)

Determination of the bore line :The depth
from road surface to HDPE pipes should
exceed 3 m.

Main components of machine

aration of drill head : Calibrate the receiver and the s

ng fluid :Mix water and some bentonite in the mixing

The pilot bore:Drilling fluid flow test

The pilot bore:Entering the ground



IV. Horizontal Directional

Drilling(HDD):Method of installing HDPE
Pipe horizontally below the ground
surface.

>3 m.





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IV. Horizontal Directional Drilling(HDD)

Determination of the bore line :The depth
from road surface to HDPE pipes should
exceed 3 m.

Main components of machine

aration of drill head : Calibrate the receiver and the s

ng fluid :Mix water and some bentonite in the mixing

The pilot bore:Drilling fluid flow test

The pilot bore:Entering the ground



IV. Horizontal Directional
Drilling(HDD) : Drill Rig

IV. Horizontal Directional
Drilling(HDD) : Drill Rig

IV. Horizontal Directional
Drilling(HDD) : Power Unit

IV. Horizontal Directional
Drilling(HDD) : Mixing Module

IV. Horizontal Directional
Drilling(HDD) :

sonde housing, Drill Head, Back
Reamer

IV. Horizontal Directional Drilling(HDD) :

Receiver ,Data Sonde

IV. Horizontal Directional
Drilling(HDD) : Bentonite

ทอ่ HDPE

IV. Horizontal Directional Drilling(HDD)

Determination of the bore line :The depth
from road surface to HDPE pipes should
exceed 3 m.

Main components of machine

aration of drill head : Calibrate the receiver and the s

ng fluid :Mix water and some bentonite in the mixing

The pilot bore:Drilling fluid flow test

The pilot bore:Entering the ground





IV. Horizontal Directional Drilling(HDD)

Determination of the bore line :The depth
from road surface to HDPE pipes should
exceed 3 m.

Main components of machine

aration of drill head : Calibrate the receiver and the s

ng fluid :Mix water and some bentonite in the mixing

The pilot bore:Drilling fluid flow test

The pilot bore:Entering the ground



IV. Horizontal Directional Drilling(HDD)

Determination of the bore line :The depth
from road surface to HDPE pipes should
exceed 3 m.

Main components of machine

aration of drill head : Calibrate the receiver and the s

ng fluid :Mix water and some bentonite in the mixing

The pilot bore:Drilling fluid flow test

The pilot bore:Entering the ground



IV. Horizontal Directional Drilling(HDD)

Determination of the bore line :The depth
from road surface to HDPE pipes should
exceed 3 m.

Main components of machine

aration of drill head : Calibrate the receiver and the s

ng fluid :Mix water and some bentonite in the mixing

The pilot bore:Drilling fluid flow test

The pilot bore:Entering the ground



IV. Horizontal Directional Drilling(HDD)

t bore:Locating and directional drilling(changes of d
Back reaming:Disassembly of drill head

Back reaming:The choice of the back reamer

ulling: Immediate pipe pulling(at small backream diam
lling: Immediate pipe pulling(at larger backream dia

ling: connection between back reamer and expande



IV. Horizontal Directional
Drilling(HDD) : Show the drill

head direction

IV. Horizontal Directional
Drilling(HDD) : Show the drill

head position