Chapter 5 DESIGN STANDARDS AND SPECIFICATIONS
Chapter 5
DESIGN STANDARDS AND SPECIFICATIONS
KD5: Final Feasibility Report including Schedules
Consultancy Services for Preparation of Feasibility Report for Construction of Bridges including Approaches on Tamu ? Kyigone ? Kalewa Road Section from km 0.00 to km 149.70 in Myanmar
5. DESIGN STANDARDS AND SPECIFICATIONS
Design standards for this project will conform with "Manual of Standard & Specifications for two laning of State Highways (IRC: SP:73-2007)", "Specification for Road and Bridge Work" by Government of India, MORTH and various relevant IRC Standards and BIS Standards. Also "Geometric Design Standards for Highways" published by Ministry of Construction, Public Works, Myanmar, also reviewed for understanding. For comparison, design standards of Myanmar also summarised below, however Indian Standards has been adopted for the project.
5.1 GENERAL CONSIDERATIONS FOR ROAD/ BRIDGE APPROACHES
a) This section lays down the standards for Geometric Design and general features for existing Bridge approaches/ existing road to two-lane with shoulders.
b) The Geometric Design of the Project Highway will conform to the standards set out in this chapter as a minimum.
c) Existing Horizontal Curves which are found deficient in radius, layout, transition lengths or super-elevation will be corrected to the specified standards. Similarly deficiencies in the vertical alignment will also be corrected.
Standards which will be used for this project are summarised in Table 5.1
Table 5.1: Design Standards
Sl. Design Specification Unit
No.
Plain
IRC Standards Terrain
Rolling Hilly
Steep
Design Speed 1 i) Ruling
ii) Minimum
Km/
hr
100
80
80
50
40
65
40
30
ROW
2 i) Built-up areas
m
30
30
30
30
ii) Open areas
70
70
70
70
3
Bridge Cross section (With Footpath)
Overall Width
m
14.8
14.8
12.0
12.0
Carriageway on Bridge Section
Crash Barrier
m
10.5
10.5
7.5
7.5
0.9 (2x0.45)
0.9
0.9
0.9
(2x0.45) (2x0.45) (2x0.45)
Foot Path
m
3 (2x1.5) 3 (2x1.5) 1.5
1.5
MEA
5-1
KD5: Final Feasibility Report including Schedules
Consultancy Services for Preparation of Feasibility Report for Construction of Bridges including Approaches on Tamu ? Kyigone ? Kalewa Road Section from km 0.00 to km 149.70 in Myanmar
Sl.
No.
Design Specification
Railing Safety Kerbs
IRC Standards
Unit
Terrain
Plain
Rolling Hilly Steep
m
0.4 (2x0.20)
0.4
0.6
0.6
(2x0.20) (2x0.30) (2x0.30)
m
-
-
-
-
4
Bridge Cross section (Without Footpath)
Overall Width
m
12.9
12.9
10.0
10.0
Carriageway on Bridge Section
Crash Barrier
Foot Path
m
10.5
10.5
7.5
7.5
0.9 (2x0.45)
0.9
0.9
0.9
(2x0.45) (2x0.45) (2x0.45)
m
-
-
-
-
Railing Safety Kerbs 5 Road cross section
m
-
-
-
-
1.5
1.6
1.6
1.5 (2x0.75) (2x0.75) (2x0.8) (2x0.8)
Width of Carriageway for
Road section
m
7.0
7.0
7.0
7.0
Width of Shoulder for road section
6 i) Open Country areas
m
2x2.5
2x2.5
Hill Side ? 1.0m Valley Side ? 2.0 m
ii) Built-up areas
2x2.5
2x2.5
Hill Side ? 1.0m Valley Side ? 2.0 m
Minimum Radii of Horizontal curve 7 i) Desirable
m 360
230
90
60
ii) Minimum
230
155
60
30
Camber/ crossfall
8 i) Bituminous
2.5
2.5
2.5
2.5
ii) Cement Concrete
%
2.0
2.0
2.0
2.0
iii) Metal/ Gravel
2.5
2.5
2.5
2.5
iv) Earthen
4.0
4.0
4.0
4.0
MEA
5-2
KD5: Final Feasibility Report including Schedules
Consultancy Services for Preparation of Feasibility Report for Construction of Bridges including Approaches on Tamu ? Kyigone ? Kalewa Road Section from km 0.00 to km 149.70 in Myanmar
Sl.
No.
Design Specification
Unit
Plain
IRC Standards Terrain
Rolling Hilly
Steep
9 Superelevation (Max.)
m
7.0
7.0
7.0
7.0
Gradient 10
i) Ruling
ii) Limiting
Sight Distance
i) Stopping 11
ii) Intermediate
ii) Overtaking
12 Roadway Width
%
3.3
%
5.0
3.3
5.0
6.0
5.0
6.0
7.0
180 m
360
120
60
45
240
120
90
640
470
235
165
m
12.0
10.0 m (exclusive of parapets and drain)
"Geometric Design Standards for Highways" published by Ministry of Construction, Public Works, Myanmar, are summarised in Table 5.2
Table 5.2: Geometric Design Standards for Highways, Myanmar
Sl. Design Specification
No.
Design Speed (mile/hour) a) Flat Country
1 b) Rolling Country c) Mountainous Country
2 Number of Lanes
3 Width of Lane (feet)
4 Right of Way (feet)
Minimum width of shoulder (feet)
a) Flat Country
5
b) Rolling Country
c) Mountainous Country
Minimum width of Formation (feet) 6
a) Flat Country
Myanmar Standards
60 50 40 2 11 (min.) 12 (desirable) 100 (min.) 150 (desirable)
8 8 6
40
MEA
5-3
KD5: Final Feasibility Report including Schedules
Consultancy Services for Preparation of Feasibility Report for Construction of Bridges including Approaches on Tamu ? Kyigone ? Kalewa Road Section from km 0.00 to km 149.70 in Myanmar
Sl. No.
Design Specification
b) Rolling Country c) Mountainous Country Earth Slope a) Flat or Rolling Country b) Mountainous Country 7
i) Cut height - 0-4 feet ii) Cut height - 4-20 feet iii) Cut height - Over 20 feet Maximum Grades (%) a) Flat Country 8 b) Rolling Country c) Mountainous Country 9 Maximum Superelevation
10 Bridges:- kerb to Kerb Width (feet)
11 Width of Culverts
Myanmar Standards
40 36
2:1
2:1 13/4:1 11/2:1
3 4 6 10 26 (min.) 30 (desirable) Full Shoulder Width
5.2 PROPOSED TYPICAL CROSS SECTIONS
The geometric standard as given in IRC:SP:73-2007 will be followed. The cross section for major/ minor bridges coming over project road will be as per MORTH notification on "Width of bridges on 2 lane National Highways (with and without Footpath) letter No. RW/NH/33044/2/88S&R(B) dated 24th March 2009 and "Width of bridges on 2 lane National Highways on Hills (with and without Footpath) letter no. RW/NH/33044/2/88-S&R(B) dated 21st Oct 2009 and IRC:SP:73-2007 are as under:-
i)
Bridge Section 1- Two lane carriageway with footpath in Plain and Rolling Terrain
ii) Bridge Section 2-Two lane carriageway without footpath in Plain and Rolling Terrain
iii) Bridge Section 3-Two lane carriageway without footpath in Hill Terrain
iv) TCS-1 : 2-lane Bridge approaches ? Both side fill slope (Plain and Rolling Terrain)
v) TCS-1A : 2-lane Bridge approaches ? Both side fill slope (New Alignment)
vi) TCS-2 : 2-lane Bridge approaches ? Both side cut slope (Plain and Rolling Terrain)
vii) TCS-3 : 2-lane Bridge approaches ? Both side fill slope (Hilly Terrain)
viii) TCS-4 : 2-lane Bridge approaches ? Left side cut and right side fill slope (Hilly Terrain)
MEA
5-4
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