Download - Road Construction Works
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BASIC KNOWLEDGE IN ROADCONSTRUCTION
Chungdu TsheringEngineer, CDB, MoWHS
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Types of Road in Bhutan
1. National Highways2. Dzongkhag Roads3. Farm Roads
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1. National Highways
a. Asian Highway (Currently the existing Phuentsholing-ThimphuHighway)
b. Primary National Highway (existing East-West Highway)c. Secondary National Highway (Currently District Roads)
Carriageway3500
Shoulder 1500
Shoulder 1500
L-Drain1000
Sub base = 190mmBase Course = 150mm
Hard Shoulder
Compacted Granular Soil Soling
Secondary National Highway
Subgrade CBR = 7%
Carriageway6500
Shoulder 1500
Shoulder 1500
L-Drain1000
Sub base = 210mmBase Course = 150mm
Hard Shoulder
Compacted Granular Soil Soling
Primary National Highway
Subgrade CBR = 7%
50mm DBM + 25mm AC
25mm PMC
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2. Dzongkhag Roads Currently feeder Roads Connects a Dzongkhag centre and a Dungkhag Centre etc.
Carriageway3500
Shoulder 500
Shoulder 500
L-Drain600
Sub base = 150mmBase Course = 150mm
Hard Shoulder
Compacted Granular Soil Soling
Dzongkhag Road
Subgrade CBR = 7%
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3. Farm Roads Roads that link farmland areas/villages.
Carriageway3500
Shoulder 500
Shoulder 500
L-Drain600
Sub base = 140mmBase Course = 120mm
Hard Shoulder
Compacted Granular Soil Soling
Farm Road
Subgrade CBR = 7%
Note: If the traffice is less than 10-15 vpd, single layer base course should sufice
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WHAT
WE DOIN ROAD CONSTRUCTION
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MAJOR ACTIVITIES
1. FORMATION CUTTIN G2. SUB-GRADE PREPARATION3. BASE COURSE & BLACK TOPPING
4. SHOULDER5. PERMANENT WORKS6. BRIDGES
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1. FORMATION CUTTING
SLOPEGRADIENTGEOMETRICDISPOSAL OF SPOIL
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2. SUB-GRADE PREPARATION
In order to maintain stable and durable sub-grade, uniformconsolidation to be incorporatedSub-grade act as a cushion for other layers i.e. In order to
achieve durable road sub-grade should be strong
.Maintain proper Camber
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SUB-GRADE PREPARATION
CAMBER
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3. BASE COURSE & BLACK TOPPING
Type I (Old) Base course = 150 + 100 = 250mm thickness 150mm = 40-63mm, (Rolling) 100mm = 20-50mm, (Rolling)
Premix = 25mm + blinding material (Rolling by applying water) Sand Seal coat Resurfacing: 20mm
Type II (New) Granular Sub-Base (GSB) coarse graded (70mm below) Wet Mix Macadam (WMM) (40 mm, 20 mm, 10 mm & Soil) mix
with water Dense Bitumen Macadam (DBM) 20mm + Bitumen Asphalt Concrete 10mm + Bitumen
Thickness depends upon the actual design for a road
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Sub-Grade Preparation
Base Course: 150mm ( 40-63mm),Rolling
Base Course: 150mm ( 20-50mm),Rolling
Premix: 10mm + bitumen, Rollingby applying water
Sand Seal Coat
Base Course & Type - I
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Sub-Grade Preparation
Granular Sub Grade ( 70mm below),rolling
Wet Mix Macadam (WMM), 10 to40mm plus soil with water & rolling
Dense Bitumen Macadam (DBM) 20mm + Bitumen
Asphalt Concrete 10mm +Bitumen
Base Course & Type - II
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TYPE - I
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TYPE - II
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4. SHOULDER:
A hard area at the side of a main road, especially amotorway, where a driver can stop if there is a seriousproblem
Shoulder should be strong enough to resist any types
of vehicle
Maintain proper compaction as per the design
Width and thickness should be as per the specification
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SHOULDER
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PERMANENT WORKS
RETAINING WALLBREAST WALLRCC WALLCULVERTDRAIN
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Breast Wall
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RCC Wall
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Culverts
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Culverts
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CATCH PITCATCH PIT
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3. BRIDGE CONSTRUCTIONRCC BRIDGESTEEL BRIDGEBAILEY BRIDGEWOODEN BRIDGE
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RCC Bridge
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Steel Bridge
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Bailey Bridge
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Wooden Bridge
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MATERIALS REQUIRED IN ROAD
CONSTN. CEMENT SAND BOULDER AGGREGATES (different sizes) STEEL MESH BITUMEN GEO-TEXTITLE RCC HUME PIPES
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CONSTRUCTED WITHOUT SPECIFICATION
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WE BUILD
GOOD & DURABLE ROAD
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WE PROVIDE TO ROAD USERS
COMFORT & SAFE RIDING LESS OPERATIONAL COST IN REASONABLE TIME
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FOR THE COUNTRY
BOOST UPCOUNTRYs SOCIO
-ECONOMYDEVELOPMENT
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