Part 2 Drainage and Highways

8/3/2019 Part 2 Drainage and Highways

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CIVL1014 Surveying and DrawingDRAWING LECTURE

Part 2: Drainage and Highways

THE UNIVERSITY OF HONG KONG

Dr. Ray SuDepartment of Civil Engineering

(office: HW 6-6, Tel. no.: 2859 2648

Email: [email protected])


2/41

Surface Drain on Podium

Grated inlet

Gutter

Sloping

floor

Fall 1 in 50-100

1

50 to 100

Drain pipes (not shown)


3/41

Surface Drain on Road

Grated inlet1 in 33

Footpath

Carriageway

Kerb

Gutter

1 in 40


4/41

Surface Drain on Slope

U-channels

Berm


5/41

U-channels and Catchpits on Slope

Catchpit

CatchpitFunctions of catchpits to connect U-

channels atdifferent levels anddirections

to catch sedimentand debris in theflowing water

U-channel

U-channel


6/41

Nullahs or Culverts for collecting stormwater only

illegal discharge ofwastewater into opennullah would causewater pollution


7/41

Manholes

Outlet

Cast

iron

steps

Manholes:- For inspection

andmaintenance ofunderground

pipes- For connectionof pipes atdifferent levelsand directions

Platform

Platform

Inlet

Inlet

Inlet


8/41

Manholes and Pipes

Pipe

ManholeManhole

PLAN

SECTION

Fall : 1 in 100 to 200


9/41

Concrete Pipes

Internal diameter of concrete pipes

range from 150mm to 2100mmSpigot & socket(s & s) connection

Y junction of pipes

Socket

end

Spigot

end


10/41

Level Define the vertical alignment of the drainage system Unit: meters above principal datum (mPD)

Pipe

Manhole

Ground Level (G.L.)

Invert Level (I.L.)

Hong Kong Principal Datum is a vertical datum first defined in 1980. Its origin is1.23m below the mean of 19 years (1965-83) observations of tide levels at NorthPoint, Victoria Harbour. Hong Kong Principal Datum is a vertical datum forengineering survey.


11/41

Chainage

Gives the horizontal reference

Measures the horizontal distance from a referencepoint Unit is in meters

CH 00

CH 10

CH 22 CH 29

CH 12CH 2310m

12m

7m

MH1 MH2

MH3

MH4

MH5 MH6

PLAN


12/41

Pipe (barrel) Installation MethodsTYPE BB

TYPE BO

Minimum protectionFor pipe below open ground

Medium protection

For pipe below pavement

This detail is applicable for both soil and rock sites

pipe

Longitudinal

section

Y1

Outer diameter of the sockettrench


13/41

TYPE AO

Maximum protection

For pipe below carriageway

Pipe (barrel) Installation Methods


14/41

PLAN

LONGITUDINAL SECTION

MANHOLE DETAILS

Inter-related


15/41

Drainage Plan

Symbol

for slopeDir.

ofthe

dip

Crest of the slope

toe of the slope

Manhole

mark

Manhole

Gutter

Enlarged

Undergrounddrain pipe 150

Dia. (see thelongitudinalsection)

Kerb

What kinds of information cannot be found

from this drawing?Flow direction of sewer, the types, sizes

and levels of pipes and manholes.

From the kerb to thecentre of manhole


16/41

Manhole Details

PLAN (MH 21) A-A

Conc. pipe

Conc. pipe

MH

Foot hole

False viewshowing the MH

entrance above

Ground surface

Ground level

I.L.

Shut off board


17/41

PLAN (MH 11) B-B

-5.855mPD

-6.050mPD (from plan)

-5.800mPD (from plan)

-4.200mPD

-4.600mPD

Ground level

Manhole Details

Th h i nt l s l (1:200) is diff nt


18/41

Longitudinal Section

Ground surface

Concrete pipe

Manhole

Surface drain pipes

Type of pipes

and type of

protection for

pipes

Horizontal reference to MHs (unit in metres)

CH 0 is defined

at MH11

Vertical position of MHs (unit in mPD)

The horizontal scale (1:200) is differentfrom the vertical scale (1:50). The mainpurpose of this drawing is to show clearlythe vertical alignments of the drainage.

Vertical position of pipes (unit in mPD)


19/41

Drainage PlanSymbol

for slopeDir.

ofdip

Crest of the slope

toe of the slope

0.000mPD Ground level

Manhole

mark

Manhole

Gutter (see the longitudinal section)

Enlarged

Undergrounddrain pipe 150

Dia.

Kerb line

G.L. -0.250mPD of the MHI.L. 3.600mPD of the pipe

G.L. -0.300mPD

I.L. 3.700mPD

G.L. -0.250mPD

I.L. 4.000mPD

I.L. 4.200mPD

G.L. -0.250mPD

I.L. 4.600mPD

G.L. 1.000mPD

I.L. 4.400mPD


20/41

CH105

CH75 CH26

CH0

CH22

49m

2

6m


21/41

Lam TsuenRiver

Example Drainage Layout Plan

Two networksmanaged byDSD:

Sewerage

(for foul water) Drainage(for stormwater)

sewerage

drainage


22/41

Highways Drawing


23/41

Street Furniture

Central

Divider

Parapet/

Barrier

Noise Barrier

Light poles

Shoulder/

Marginal Strip

Direction sign gantry

Road marks

Carriageway with 3 lanes


24/41

Setting out

Setting out line (S.O.L.)

A curved road

Direction forincreasing the

chainage numbers

CH 100

CH 200

CH 300

Chainage measured along a S.O.L.

is used to give horizontal

references/ distances of the S.O.L.

(unit in metres)


25/41

Superelevation

Horizontal line

Setting out line

Crossfall/

Superelevation

Centrifugal

force

Reaction

Weight

Superelevation

To counter balancethe centrifugal

force

Superelevation is tilting the roadway to help offset the centrifugalforce developed as the vehicle goes around a curve.


26/41

tilted road surface

A

A

Positive

crossfall (%)

horiz. ref.

S.O.L become a

point in this

sectional viewSection A-A

Setting out line (S.O.L.)

A curved road

Direction forincreasing the

chainage numbers

CH 10

CH 30

CH 50

h

x

Crossfall =(h/x)100 %

Superelevation

P t J i


27/41

Pavement

Concrete surface

Bituminous surface

Joints

longitudinal & lateral

Rigid pavement

Flexible pavement

Joints are requiredfor (1) construction

(2) Allowing movement& preventing crackingof pavements

M t J i t


28/41

Movement Joint

Movement joint


29/41

Verge

Verge

Without the verge,thesight distance can besubstantially reduced


30/41

Highway Verge

A turned road

without verge

A turned road with

verge (no blockage)

Verge

Verge can (1) increase the sight distance, (2) improve thedriving comfort, (3) enhance road safety, (4) increase thespeed limit of the road. It should be unblocked but couldprovide temporary parking space under emergency

situations

Very short

sight distance

Sight distance

can be

increased

substantially


31/41

NOTES

1. ALL DIMENSIONS ARE IN MILLIMETERS UNLESS

STATED OTHERWISE,

2. ALL COORDINATES GIVEN IN THIS DRAWING ARE

BASED ON THE 1980 GAUSS CONFORMAL COORDINATE

SYSTEM UNLESS STATED OTHERWISE.

3. ALL LEVELS ARE IN METERS ABOVE PRINCIPAL DATUM

UNLESS STATED OTHERWISE.

4. SUPERELEVATION SHALL BE APPLIED BY PIVOTING

ABOUT THE SETTING OUT LINE UNLESS NOTED

OTHERWISE.

5.

Sectional view(Looking into the paper is)


32/41

6. HORIZONTAL ALIGNMENT NOTATIONS

L = 40m => 40m SPIRAL LENGTH

LH = 400m => 400m LEFT HAND RADIUS CURVE

RH = 400m => 400m RIGHT HAND RADIUS CURVE

7. VERTICAL ALIGNMENT NOTATIONS

VIP: VERTICAL INTERSECTION POINT

20m VC => 20m LONG VERTICAL CURVE (a smooth curve)

10% : SETTING OUT LINE GRADIENT

Both angles andcurvatures are

continuous at the two

ends of the curve

Spiral curveRight hand

radius curve

Left hand

radius curve

Increase in the

chainages of the

setting out line

R=400m R=400m

PLAN VIEW

Centre is at LHS

of the SOL

3 forms of linesStraightCircular ArcSpiral

Curvature =1/R

Curvature = 0=1/ NOTES

C t Sl


33/41

Cut Slopes

S i f A Sl


34/41

Section of A Slope

Ground profile of an existing slope

New platformto be created

Soil to be excavated

Soil to be filled

Cut slope

Fill slope


35/41

Crest ofthe slopeToe of the

slope

Just a thick linein a drawing


36/41

Settingout line(S.O.L.)

Plan view Longitudinal Section

Cross Sections

Read the drawingssimultaneously

(along the S.O.L.)

Highway Plan


37/41

Highway Plan

latitude

longitude

Based onthe 1980Gaussconformalcoordinatesystem

Cut slope

Crest

BermToe

Symbolshowing thenorthdirection

Contour lines (unit:mPD) representing the

existing ground profile

Existing house which may

be affected by the roadconstruction

Chainage along theS.O.L.

Setting out line(S.O.L.)

central divider

RETAININGWALL

Cut slope

Cut slope

Cut slope

Fill slope

L n it din l S ti n ( l th tti t li )


38/41

Enlarged

Gives horiz.reference

VIP 1Elevation =36.961mPD

VC (a parabolic curve)

Enlarged

Gradient of the

SOL

=76-54

superelevation

sprial sprialRight hand radius curve

L=left carriageway

R=right carriagewayExtent of the plan

25.846

=(54+22/2)0.171+25.846(270-76+11+5)0.1+36.961=

Longitudinal Section (along the setting out line)

Existing groundprofile

Highway Plan

1:500


39/41

Highway Plan

latitude

longitude

Based onthe 1980Gaussconformalcoordinatesystem

Cut slope

Crest

BermToe

Cut slope

Cut slope

Cut slope

Retaining wallSymbolshowingthe northdirection

Contour lines (unit:mPD) representing the

existing ground profile

Existing house which may

be affected by the roadconstruction

Chainage along theS.O.L.

Setting out line(S.O.L.)

central divider

RH=45m

CH150

CH150CH170

CH170

1:500

Spiral curveLength =40m

Straight line

C i


40/41

Cross Section

Retaining wall

Railing

U-channel

U-channel

U-channel

U-channel U-channel

Cut slope

Cut slope

Left

carriageway

Right

carriageway

Crossfall 7%Crossfall 10%

Bedrock profile

Vertical level in mPD

C S i


41/41

Leftcarriageway

Rightcarriageway

Crossfall 7%Crossfall 10%

Cross Section

Documents

Part 2 Drainage and Highways