J.3A-Earthworks_drawings.pdf

TYPICAL CROSS SECTION, PAVEMENT

& LONGITUDINAL DRAINAGE DRAWINGS

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Junction Layout Plan for Access RCP Culverts

CENTRE LINE OF MAIN ROAD

JUNCTION LAYOUT TYPE 2

Access CulvertStop Sign (Where Provided for)

Minor Road

Main Road

CENTRE LINE OF MAIN ROAD

JUNCTION LAYOUT TYPE 1

Access CulvertStop Sign (Where Provided for)

Minor Road

Main Road

CENTRE LINE OF MAIN ROAD

JUNCTION LAYOUT

Access CulvertStop Sign (Where Provided for)

Minor Road

Main Road

CENTRE LINE OF MAIN ROAD

JUNCTION LAYOUT

Stop Sign (Where Provided for) Minor Road Main Road

JUNCTION LAYOUT TYPE 4JUNCTION LAYOUT TYPE 3

JUNCTION LAYOUTS SHOWING POSITION OF ACCESS CULVERTS

EW001

7 %7 %

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Laterite thickness, t = 150mm

Wc

W

Ws Ws

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws Min H (mm) n b a d t

2 - 20 - 50 VPD 5000 1000 7000 500 1 1000 150

3 - <20 VPD 4500 1000 6500 400 1 800 150

ROAD FORMATION OR RESHAPING WITH LINED DRAINS ON EVEN GROUND

CROSSECTION E1

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Varies

50mm PVC Pipe Drain at 5m intervals

CL

DETAIL L: LINED TRAPEZOIDAL CONCRETE CHANNEL

H

H H 100 100

1 100

Max 1:1, Min 3:1

Varies

Detail L

Cement Stabilised Backfill.

(1:4 Cement: Soil Mix)

Road Formation & Reshaping Cross Sections With Lined Drains

EW016

1 - Over 50 VPD 5500 - 6000 1000 7500 - 8000 500 1 1000 150

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Laterite thickness, t = 150mm

Wc

W

Ws Ws

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws Min H (mm) n b a d t

2 - 20 - 50 VPD 5000 1000 7000 500 1 1000 150

3 - <20 VPD 4500 1000 6500 400 1 800 150

ROAD FORMATION/RESHAPING WITH LINED DRAINS ON SLOPING GROUND

ROAD FORMATION/RESHAPING ON SLOPING GROUND: CROSSECTION E2

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Note: All commencing surfaces must be scarified to atleast 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course.

Varies

50mm PVC Pipe Drain at 5m intervals

CL

DETAIL L: LINED TRAPEZOIDAL CONCRETE CHANNEL

H

H H 100 100

1 100

Max 1:1, Min 3:1

Detail L

Cement Stabilised Backfill.

(1:4 Cement: Soil Mix)

EW015

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Ws Wc Ws

W

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws Hf Rw Fw n t

1 - Over 50 VPD 5500 - 6000 500 6500 - 7000 Varies Varies Varies 2 200

2 - 20 - 50 VPD 5500 500 6500 Varies Varies Varies 2 200

3 - <20 VPD 5000 500 6000 Varies Varies Varies 2 200

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width W - Shoulder to Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted) Hf - Height of Embarkment Fill

Embarkment Fill BoQ Item 3.1.2

Wearing Course BoQ Item 3.2.1

1 : n

Fw

Existing Road Surface Before Site Clearance.

However Removal/Stripping of Unsuitable Material do be done Prior to Commencement of Filling Works.

The Site clearance is paid under Bill Item 2.2

Earth Works: Embarkment Filling Cross sections

Laterite thickness, t = 200mm

Note;

1. The existing road bed surface has to be stripped of any vegetation, organic material and any unsuitable material, and thereafter compacted to the specified density, prior to commencement of embarkment filling.

2. Embarkment filling has to be done in form of several compacted layers not exceeding 200mm thickness, and each layer should be appropriately moistened and compacted to the specified density or compaction.

Average Fill Height, Hf

EMBANKMENT FILLING WITH EVEN CAMBER

CROSSECTION A1

EW007

7 %

1 : n max 1 : 1 and min. 3 : 1

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

7 %

1 : n max 1 :1 and min. 3 :1 d

W

Wc Ws

W

Ws b

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws H n b a d t

1 - Over 50 VPD 5500 - 6000 500 6500 - 7000 500 2 1000 150

2 - 20 - 50 VPD 5000 500 6000 500 2 1000 150

3 - <20 VPD 4500 250 5000 400 2 800 150

Earth Works: Superelevation Cross Sections

Laterite thickness, t = 150mm

Laterite thickness, t = 150mm

Road Centre Line

Road Centre Line

Ws d ab WcWs a

H = Min 3000

H =Min 300

ROAD FORMATION or RESHAPING WITH SUPERELEVATION

CROSSECTION D1

CROSSECTION D2

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width W - Shoulder to Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Existing Ground /Commencing Surface

Ordinary Fill, BoQ Item 3.1.2

Existing Ground /Commencing Surface

Ordinary Fill, BoQ Item 3.1.2

Wearing Course BoQ Item 3.2.1

Wearing Course BoQ Item 3.2.1

Note: All commencing surfaces must be scarified to atleast 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course.

EW013

Natural ground profile with freefall of runoff

1 : n max 1:1 and min. 3:1

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

7 %7 %

Natural ground profile with freefall of runoff

1 : n max 1:1 and min. 3:1

W

Ws d d ba aW

Ws Wc

Wc

Laterite thickness, t = 150mm

Laterite thickness, t = 150mm

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws H n b a d t

1 - Over 50 VPD 5500 - 6000 500 6500 - 7000 500 2 1000 150

2 - 20 - 50 VPD 5000 500 6000 500 2 1000 150

3 - <20 VPD 4500 250 5000 400 2 800 150

H

Ws

Ws

H

ROAD FORMATION or RESHAPING CROSS SECTIONS

CROSSECTION B1

CROSSECTION B2

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Note: All commencing surfaces must be scarified to at least 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course. Road Formation or Reshaping Cross Sections

EW009

max 1:1 and min. 3:1

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Laterite thickness, t = 150mm

7 %7 %

1 : n max 1:1 and min. 3:1

Wc

W

Ws b a Wc ba

W

Laterite thickness, t = 150mm

Ws

Ws dd

Ws

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws H n b a d t

1 - Over 50 VPD 5500 - 6000 500 6500 - 7000 500 2 1000 150

2 - 20 - 50 VPD 5000 500 6000 500 2 1000 150

3 - <20 VPD 4500 250 5000 400 2 800 150

H

H

ROAD FORMATION or RESHAPING CROSS SECTIONS

CROSS SECTION C1

CROSS SECTION C2

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Note: All commencing surfaces must be scarified to at least 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course.

Road Formation or Reshaping Cross

EW011

CUT TO CART AWAY FOLLOWED BY ROAD FORMATION ON EVEN GROUND

Back Sloping Width, Bw1Back Sloping Width, Bw2

7 %7 %

1 : n dd

STAGE 2: HEAVY GRADING/ROAD FORMATION (BoQ ITEM 3.1.3)

7 %7 %

1 : n

Laterite thickness, t = 150mm

Wc

W

Ws Ws dd

STAGE 3: GRAVELLING (BoQ ITEM 3.2.1) - CROSS SECTION E1

Road Formation Width (Ditch to Ditch)

W 500

Road Formation Width (Ditch to Ditch)

Existing/Natural Ground Road Surface

Residual Surface After Excavation in Cut

Excavation in Cut (BoQ Item 3.1.1)

Slope 3:1 Min or 1:1 Max

Commencing Road Surface Shaped & Compacted Road Bed (BoQ Item 3.1.3)

STAGE 1: EXCAVATION IN CUT (BoQ ITEM 3.1.1)

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted) Bw - Backsloping width

Heavy Earthworks (Cut to Cart Away & Heavy Grading)

EW015

CROSS FILL & ROAD FORMATION IN CUT SECTION ON SLOPING GROUND

Back Sloping Width, Bw1

7 %7 % d

STAGE 2: HEAVY GRADING/ROAD FORMATION (BoQ ITEM 3.1.3)

7 %7 %

Laterite thickness, t = 150mm

Wc Ws d

STAGE 3: GRAVELLING (BoQ ITEM 3.2.1) - CROSS SECTION E1

Existing/Natural Ground Road Surface

Residual Surface After Cross Fill (Item 3.1.2a )

Excavation Area

Slope 3:1 Min or 1:1 Max

Commencing Road Surface Shaped & Compacted Road Bed (BoQ Item 3.1.3)

STAGE 1: CROSS FILL (BoQ ITEM 3.1.2a)

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted) Bw - Backsloping Width

Road Formation Width

Road Formation Width

W

W

Ws (widened)

Fill Area Using Cut Material (BoQ Item 3.1.2a)

Shaped & Compacted Laterite (BoQ Item 3.2.1)

Slope 3:1 Min or 1:1 Max

Slope 3:1 Min or 1:1 Max

Minimum Average Cut Height is 300mm, Otherwise Works at the Section are Paid under Heavy Grading

Slope 1:n

Heavy Earthworks (Cross Fill & Heavy Shaping)

EW005

Benched Surface

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Ws

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws Rw Fw n t

1 - Over 50 VPD 5500 - 6000 500 6500 - 7000 Varies Varies 2 200

2 - 20 - 50 VPD 5500 500 6500 Varies Varies 2 200

3 - <20 VPD 5000 500 6000 Varies Varies 2 200

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width W - Shoulder to Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted) Hf - Height of Embarkment Fill

Embarkment Fill BoQ Item 3.1.2

Wearing Course BoQ Item 3.2.1

1 : n

Fw

Earth Works: Embarkment Filling with Superelevation (Cross Sections)

Laterite thickness, t = 200mm

Note;

1. The existing road bed survafe has to be stripped of any vegetation, organic material and any unsuitable material, and thereafter compacted to the specified density, prior to commencement of embarkment filling.

2. Embarkment filling has to be done in form of several compacted layers not exceeding 200mm thickness, and each layer should be appropriately moistened and compacted to the specified density or compaction.

EMBANKMENT FILLING WITH SUPERELEVATION

CROSSECTION A2

Ws

W

Existing Road Surface Before Site Clearance.

However Removal/Stripping of Unsuitable Material do be done Prior to Commencement of Filling Works.

The Site clearance is paid under Bill Item 2.2

EW008

max 1 : 1 and min. 3 :1

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

7 %

1 : n max 1 :1 and min. 3 :1 d

W

W b

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band W H n b a d t

1 - Over 50 VPD 6500 - 7000 500 2 1000 150

2 - 20 - 50 VPD 6000 500 2 1000 150

3 - <20 VPD 5000 400 2 800 150

Earth Works: Superelevation Cross Sections

Road Centre Line

Road Centre Line d ab a

H = Min 3000

H =Min 300

ROAD FORMATION or RESHAPING WITH SUPERELEVATION ON INSITU GRAVEL/LATERITE

CROSSECTION D3

CROSSECTION D4

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width W - Shoulder to Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Existing Ground /Commencing Surface

Laterite Fill, BoQ Item 3.2.1

Existing Ground /Commencing Surface

Laterite Fill, BoQ Item 3.2.1

Note: All commencing surfaces must be scarified to atleast 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course.

EW014

Natural ground profile with freefall of runoff

1 : n max 1:1 and min. 3:1

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

7 %7 %

Natural ground profile with freefall of runoff

1 : n max 1:1 and min. 3:1

Wd d ba aW

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band W H n b a d t

1 - Over 50 VPD 6500 - 7000 500 2 1000 150

2 - 20 - 50 VPD 6000 500 2 1000 150

3 - <20 VPD 5000 400 2 800 150

H

H

ROAD FORMATION or RESHAPING ON INSITU GRAVEL/LATERITE

CROSSECTION B3

CROSSECTION B4

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Note: All commencing surfaces must be scarified to at least 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course. Road Formation or Reshaping Cross

EW010

max 1:1 and min. 3:1

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

7 %7 %

1 : n max 1:1 and min. 3:1

W b a ba

W dd

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band W H n b a d t

1 - Over 50 VPD 6500 - 7000 500 2 1000 150

2 - 20 - 50 VPD 6000 500 2 1000 150

3 - <20 VPD 5000 400 2 800 150

H

H

ROAD FORMATION OR RESHAPING CROSS SECTIONS

CROSS SECTION C3

CROSS SECTION C4

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Note: All commencing surfaces must be scarified to at least 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course. Road Formation or Reshaping Cross

EW012

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Mi n 5

Min 1000

CULVERT OUTLET CHANNEL IN ACTIVE STREAMS

DRAIN TYPE E 2

Slope 1: 2

Min 500

Min 3000 from Road Side Drain

Slope 1:1

TYPICAL CATCH WATER DRAIN ON SLOPING GROUND

DRAIN TYPE E 1

Mi n 5

Min 500

CULVERT OUTLET CHANNEL FOR RELIEF CULVERTS & MITRE DRAINS

DRAIN TYPE E3

Slope 1: 1

Drainage Detail: Earth Water Drains

Excavated Material

500 1000

400 800

ROAD SIDE DRAINS

DRAIN TYPE S1

ROAD SIDE DRAINS

DRAIN TYPE S2

TYPICAL EARTH DRAINS TYPES & DETAILS

ED001

DB10@200 C/C

DB10@150 C/C

CL

SECTION THROUGH LINED TRAPEZOIDAL CONCRETE

CHANNEL (REINFORCEMENT DETAIL)

H

H H 100 100

CONSTRUCTION JOINT DETAIL IN LINED

TRAPEZOIDAL CONCRETE DRAIN

DB10@200 C/C TIE BAR - DB12@500 C/C

1000mm Long

Class 20 Concrete

TYPICAL REINFORCEMENT STEEL ARRANGEMENT FOR

LINED CHANNEL DRAIN (REINFORCEMENT DETAIL)

DB10 Steel as detailed in structural drawing detail

Expansion Joints at 22,500 Spacing

Expansion Joint

50mm Mass Concrete Blinding

50mm PVC Pipe Drain at 5m intervals

CL

DETAIL L: LINED TRAPEZOIDAL CONCRETE CHANNEL

DRAIN TYPE L1

H

H H 100 100

1 100

Cement Stabilised Backfill.

(1:4 Cement: Soil Mix)

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Drainage Detail: Lined Water Drains

1. All dimension are in millimeters unless otherwise specified

2. H for Lined Drains Varies from Min 400mm - 600mm but the decision on the H depth to use rests entirely with the engineer. The engineer will advise on the appropriate H in the form of a site instruction.

However as a guide H is a function of the Slope of the water channel, Flow Rate Q and roughness.

Flatter channels will tend to have bigger H size than Steeper Channels.

50mm PVC Pipe Drain at 5m intervals

CL

DETAIL L: LINED TRAPEZOIDAL GROUTED STONE

CHANNEL DRAIN TYPE L2

H

H H 100 100

1 200

Cement Stabilised Backfill.

(1:4 Cement: Soil Mix)

TYPICAL LINED DRAINS TYPES & DETAILS

50mm PVC Pipe Drain at 5m intervals

CL

DETAIL L: LINED TRAPEZOIDAL GROUTED STONE

CHANNEL DRAIN TYPE L3

H

H H 100 100

Cement Stabilised Backfill.

(1:4 Cement: Soil Mix)

LD001

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Erosion Control: Scour Check Details

1. All dimension are in millimeters unless otherwise specified

TYPICAL EROSION CONTROL SCOUR CHECKS

400125250125

PLAN OF WOODEN SCOUR CHECKS

CROSS SECTION C-C:

PLAN OF WOODEN SCOUR CHECKS CROSS SECTION D-D:

PLAN OF GROUTED STONE SCOUR CHECKS

PLAN OF GROUTED STONE SCOUR CHECKS

D C

300 300

Existing Side Drain Profile

Scour Check Spacing

LONGITUDINAL CROSS SECTION

THROUGH WOODEN STICK SCOUR CHECKS

PERSPECTIVE VIEW AFTER

SCOUR CHECK CONSTRUCTION

Scour Check Spacing

Scour Check Spacing

EP001

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

Laterite thickness, t = 150mm

Wc

W

Ws Ws

Conversion Factor: 1 ft = 0.3048m = 304.8mm

Feeder Road Traffic Band Wc Ws W = Wc + 2Ws Min H (mm) n b a d t

2 - 20 - 50 VPD 5000 1000 7000 500 1 1000 150

3 - <20 VPD 4500 1000 6500 400 1 800 150

ROAD FORMATION/RESHAPING WITH LINED DRAINS ON SLOPING GROUND

ROAD FORMATION/RESHAPING ON SLOPING GROUND: CROSSECTION E2

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted)

Note: All commencing surfaces must be scarified to atleast 150mm and moistened prior to shaping, and the same procedure repeated prior to placement of gravel wearing course.

Varies

50mm PVC Pipe Drain at 5m intervals

CL

DETAIL L: LINED TRAPEZOIDAL CONCRETE CHANNEL

H

H H 100 100

1 100

Max 1:1, Min 3:1

Detail L

Cement Stabilised Backfill.

(1:4 Cement: Soil Mix)

EW015

Road Formation/Reshaping with Lined Drains on Sloping Ground

CUT TO CART AWAY FOLLOWED BY ROAD FORMATION ON EVEN GROUND

Back Sloping Width, Bw1Back Sloping Width, Bw2

7 %7 %

1 : n dd

STAGE 2: HEAVY GRADING/ROAD FORMATION (BoQ ITEM 3.1.3)

7 %7 %

1 : n

Laterite thickness, t = 150mm

Wc

W

Ws Ws dd

STAGE 3: GRAVELLING (BoQ ITEM 3.2.1) - CROSS SECTION E1

Road Formation Width (Ditch to Ditch)

W 500

Road Formation Width (Ditch to Ditch)

Existing/Natural Ground Road Surface

Residual Surface After Excavation in Cut

Excavation in Cut (BoQ Item 3.1.1)

Slope 3:1 Min or 1:1 Max

Commencing Road Surface Shaped & Compacted Road Bed (BoQ Item 3.1.3)

STAGE 1: EXCAVATION IN CUT (BoQ ITEM 3.1.1)

Scale:Sheet No:

Revision No:

Drawn by:

Approved by:

Drawing Title & Detail:

Designed by:

Checked by:

Road Name: & Location

Date:

Client:

Drawing No: Date:

Ministry of Public Works, GOL.

Funded by: USAID Liberia

Ministry of Public Works, Liberia.

Do Not Scale __ of __

GENERAL NOTES

Engineering Services for Rural Road Rehabilitation Project

1. All dimension are in millimeters unless otherwise specified

2. Selection of typical cross section shall be specified by the design engineer

3. Dimensions of typical cross section may vary due to site condition

4. Wc and W shall be determined depending on design class of the road.

5. Preferably ( 1:n ) is ( 1:2 )

6. Abbreviations Rw - Right of Way (Usually 15m) Fw - Road Formation Width Wc - Wearing Course Width Ws - Shoulder Width d - Side Drain Width 1:n Rise:Horizontal run t - Gravel/Laterite thickness (Compacted) Bw - Backsloping width

Heavy Earthworks (Cut to Cart Away & Heavy Grading)

EW017