1. Unit-IVUnit-IV
Hill Roads And DrainageHill Roads And Drainage
ByBy
Mr. Hole G.R.Mr. Hole G.R.
(Lecturer in Civil Department)(Lecturer in Civil Department)
Jayawantrao Sawant PolytechnicJayawantrao Sawant Polytechnic
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2. Unit-IV
Hill Roads And DrainageHill Roads And Drainage
Total Hrs.:-06 Hrs. Total Marks=10 Marks
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Syllabus
3. ∗ Roads constructed in mountainous region is called Hill roads.
∗ There are different considerations while designing hill roads as
compare to plain area roads.
∗ Types of curve used in hill roads is of different than plain road.
∗ All Geometric parameters will gets changes while designing hill roads
such as- Curves , Superelevation,SSD,OSD,Extra Widening etc.
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5.1 Introduction
5. ∗ Road Bed
∗ Side Drain
∗ Parapet wall
∗ Catch Water Drains
∗ Brest wall
∗ Retaining wall
∗ Cross Drains
A) Road Bed:-
The pavement potion of hill road is called Road bed.
Function: To Resist stresses developed due to moving traffic.
B) Side Drain :-
-Drain Provided on the sides of road is called side drain
- Side Drains Runs Parallel to the length of road.
Function: To collect and drain off rain water collected from camber o of road.
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Continue.
6. C) Parapet Wall:
wall which is provided above the formation level in the down side slope is called
parapet wall.
Function: Protection to the traffic against falling down the hill slope.
D) Catch Water Drain:
It is drain provided on higher slope running parallel to the length of road.
Function : To make intercept for runoff coming from top of hill and divert water in to
near by cross drains.
E) Brest wall :
The wall constructed to up side slope is called Brest wall.
Function: Protect road from sliding of up side slope.
F) Retaining Wall:
The wall constructed to down side slope of road is called retaining wall.
Function: -To Protect down side slope from sliding.
-To Resist pressure of earth fill .
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Continue.
7. G) Cross Drains:
The drains which is laid along width of road is called cross drains.
Function: To drain off rain water collected in side drains and catch drains.
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Continue.
8. 1.Length of Road:
Alignment of road should be short as possible bcoz cost will be increased as length of
road increases.
2.Geometrical Standards:
-Alignment of road should have proper geometrical standards such as
Gradient,Curves,SD,Radious of curves.
- Min. Radius of curve for hill road is allowed to 50m.
3.Existing Saddle or Pass:
Alignment of road should not pass through ridge line of hill to avoid extra cutting and
filling.
Alignment should passes through series of hills through existing saddle points.
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Factors controlling Alignment of Hill Road .
9. 4.Drainage Line:
Alignment of road should be parallel to drainage line to avoid no of cross
drainage drains.
5. Stability:
Alignment of road should passes along the stable and side having mild slope of
hill road.
6.Altitude:
-Altitude of road should not be passes through high altitude as well as low
altitude .
-High Altitude causes problem of snow falling and low altitude will increase no.
of cross drains.
-Alignment of road passes through altitude between 900 to 1500m.
-Alignment of road should faces sun and not located in windward side of hill
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Factors controlling Alignment of Hill Road .
10. 7.Cutting through Rocks:
Alignment of road should not passes through solid rocks to avoid cost of
cutting.
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Factors controlling Alignment of Hill Road .
11. Alignment of Hill roads is fixed in three stages:
1. Reconnaissance
2. Trace out
3. Detailed Survey.
1.1.Reconnaissance:Reconnaissance:
-The temporary alignment of road is fixed during reconnaissance
survey by studying topographical, geographical and metrological
maps of the area .
-Arial survey is carried out for remote area.
2.Trace out :.Trace out :
-The route selected during reconnaissance survey is translated on
ground so as to collect details from actual site.
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Alignment Survey Of Hill Road:-
12. - 1 to 1.5 m wide track is constructed so as to collect details.
3.Detailed Survey:3.Detailed Survey:
--During Detailed survey BM are fixed on ground.
-Prepare c/s Along length and along width.
-Mark the center line and boundary line of highway.
-Hydrological and soil investigation is carried out.
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Cont.
13. 1.Rock Cutting
2. Vertical Cutting (Precipice work)
3.Retaining wall
4. Foundation of Retaining wall
5.Revetment wall
6.Pavement Construction
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Construction procedure of Hill Road