Schematic Design

CCCC-FHDI

July, 2011

Port Sudan SPC Flyover Engineering

Let the world more smoothly

1. Project Overview

3. Existing Problems and Suggestions

2. Scheme Introduction

Outline

1.Project overview – construction background

The project is located in a heavy traffic area near the green area of Port Sudan. After the green area constructed, the freight volume have greatly increased, which bring higher request to the existing port highway traffic capacity.

Therefore a transport junction is proposed for improving the port highway capacity

Green area

Fishing port of Port Sudan

Main road to north

Main road to south

1.Project overview – Geographic location

The project site is

adjacent to the

dispatching center of

Port Sudan railway

freight station and SPC

Port Sudan

headquarters building,

1km from fishing port,

2km from berth 1-4 of

green area, and 6.5km

from downtown bus

station.

Downtown direction Green

area

directio

n

Fishing port

direction

1.Project overview – Existing roads

There are 3 roads in project site form a five road intersection, also, there are some railroads pass the project site, two railroads are usually used, others are rarely used. Around the project site there are railway yard, clearing area, warehouse, and SPC building.

Existing roadsRailway

yard

Warehouse

Clearing area

SPC building

The existing roads are 10m wide, without isolation strip.

On both sides of the road are sundry warehouse and oil tank area

Existing roads

Project site

1.Project overview – Geographic location

1.Project overview – Improving idea

Existing traffic problemThe existing intersection is the main traffic junction connect the port, with the increasing of the port cargo-handling capacity and development of logistics industry, the traffic volume is increasing rapidly. More and more large transport vehicles and sedan cars run interference which make the traffic become confusion and congestion. And also, multiterm railroads intersect the existing road, which greatly disturb the traffic vehicle running.

let the sedan cars run in all directions, trucks can only run along the red arrows road. In future, trucks can run along the purple arrow direction, through ramp bridge going into port area.

Improving idea

Project site

1.Project overview – Main technical standard

Highway classification ： Third grade

Design speed：Mainline:40km/h; Ramp:25km/h

Road width ： 10m (dual 2 lanes)

Pavement service life ： 20 years

Bridge design load ： Highway-I

grade

Highway clearance ： 5.0m

Railroad clearance ： 5.5m

Item UnitStandard value

Design value

Highway classificationThird grade

Third grade

Design km/h 40 40

Pavement design loadHighway – I grade

Highway – I grade

Pavement cross slope % 1.5~2 2

Road width m 10 10

Road length m 1080

Horizo-ntal curve

Min. radius m 600 13000

Min. length m 70 114

Min. length of easement curve

m 35 35

Vertical curve

Min. radius of concavity vertical curve

m 700 1000

Min. radius of convexity vertical curve

m 700 1200

Max. longitudinal slow % 7 5

Min. slow length m 120 130

Min. length of vertical curve m 35 40

Pavement typeAsphalt concrete

2.Scheme introduction - Design idea

According to the

characteristics of the

intersection, we consider two

design ideas.

The first one is to maintain the

existing five road intersection

unchanged, recently through

the mainline tunnel or viaduct

to ensure the traffic smooth,

forward increase left turn ramp

bridge to separate trucks from

ground ring intersection.

The second design idea is

using the north section of

south-north direction main

line as a special channel

to trucks, sedan cars

should run through road C

connecting to the main

line.

Based on the two design

idea, tunnel and viaduct

are compared respectively

in the scheme, so, form

four scheme, and every

scheme involves recent

and forward stage

scheme.

Sedan cars runaround

way

Forward trucks special lane

Recent trucks special lane

2.Scheme introduction - Design idea

Recent stage scheme set two layers, first layer is the south-north direction tunnel under ground in connection with road A and road E

2.Scheme introduction – Scheme 1 (recent stage)

Second layer is the relief roads above two sides of the tunnel, after intersecting with the railroad, going through the roundabout into road A,B,C,G.

Fishing port

directionDowntown direction

Green

area

directio

n

2.Scheme introduction – Scheme 1 (recent stage)

In forward stage, a left turn ramp bridge D will be constructed to link road E’s west side relief road and road G, also a right turn ground ramp F will be constructed to link road E’s east side relief road and road G, achieve split-flow traffic.

Ramp bridge

D

Ground ramp F

2.Scheme introduction – Scheme 1 (forward stage)

Recent stage Scheme 2 set a mainline viaduct above ground connect road A and road E, furthermore, reserve interface with forward left turn ramp bridge D

Relief road

Mainline viaduct

Relief road

Reserved interface

2.Scheme introduction – Scheme 2(recent stage)

The ground lay is a five roads intersection, the relief roads under two sides of the viaduct, after intersecting with the railroad, going through the roundabout into road A,B,C,G.

Fishing port

directionDowntown direction

Green

area

directio

n

2.Scheme introduction – Scheme 2(recent stage)

Relief road

Relief road

In forward stage, a left turn ramp bridge D will be constructed to link road E’s west side relief road and road G.

Furthermore, we will control the traffic flow direction on the mainline viaduct to stop the northward direction vehicles running onto the viaduct. So vehicles can enter the port area by mainline viaduct, ramp bridge D and ground roads, but leave the port area only by ground roads and ramp bridge D.

Ramp bridge D

Relief road

Relief road

2.Scheme introduction – Scheme 2 (forward stage)

Scheme 3 is similar to scheme 1, the first layer is the mainline tunnel under ground in connection with road A and road E.

2.Scheme introduction – Scheme 3(recent stage)

Mainline tunnel

There are no relief roads

but only mainline tunnel

about road E, so it

became a truck special

straight-going lane for

entering port area. Sedan

cars need to go by a

runaround way.

Sedan cars runaround

way

Trucks special lane

2.Scheme introduction – Scheme 3(recent stage)

Mainline tunnel

The second layer is differently, there is no relief road beside the tunnel, so the intersection is a four roads intersection, the traffic flow can be controlled easier by using traffic signal lamps.

2.Scheme introduction – Scheme 3(recent stage)

Downtown direction Fishing port

direction

Green

area

directio

n

The third layer in forward stage is the same with scheme1, a left turn ramp bridge D will be constructed to link road E’s west side relief road and road G, also a right turn ground ramp F will be constructed to link road E’s east side relief road and road G, achieve split-flow traffic.

Ramp bridge D

Ground ramp F

2.Scheme introduction – Scheme 3 (forward stage)

Only mainline viaduct is

design as road E, with

no relief roads under

bridge, so it become a

straight direction trucks

special lane. Sedan

cars need to circumvent

by runaround way(blue

arrows).

Sedan cars runaround

way

Trucks special lane(viaduct)

2.Scheme introduction – Scheme 4(recent stage)

Mainline viaduct above ground connects road A and road E, furthermore, reserves interface with forward left turn ramp bridge D.

Mainline viaduct

Reserved interface

Cancel relief road

Relief road

There are no relief roads under the viaduct, so the intersection is a four roads intersection, traffic flow can be controlled easier by using traffic signal lamps.

2.Scheme introduction – Scheme 4(recent stage)

In forward stage, a left turn ramp bridge D will be constructed to link road E’s west side relief road and road G.

Furthermore, we will control the traffic flow direction on the mainline viaduct to stop the northward direction vehicles running onto the viaduct. So vehicles can enter the port area by mainline viaduct, ramp bridge D and ground roads, but leave the port area only by ground roads and ramp bridge D.

Ramp bridge D

Relief road

2.Scheme introduction – Scheme 4 (forward stage)

The total length of mainline tunnel is 530m, containing open section and closed section. The open sections are at the two ends, each of which is 110m long. The closed part is a single box with one cell, 310m long in the middle. The standard part is 9.6m wide, and 5m high.

2.Scheme introduction – Structure (mainline tunnel)

Forward left turn ramp bridge D is prestressed concrete continuous box girder structure. Bridge width of scheme 1 and 3 is 7m wide, of scheme 2 and 4 is 9m wide. In standard section under box girder are single pillar pier, and crotch section use Y shape plate pier. Bridge abutments are bed plate abutments and the foundations are bored piles foundations.

2.Scheme introduction – Structure (ramp bridge)

The main line viaduct is 420m long and 9m wide, the superstructure is prestressed concrete continuous box girder.In standard section under box girder are single pillar pier, and crotch section use Y shape plate pier. Bridge abutments are bed plate abutment and the foundation is bored piles foundation.

2.Scheme introduction – Structure (mainline viaduct)

Item Scheme 1 Scheme 2 Scheme 3 Scheme 4

Transportation capacity

Satisfy the intersection traffic requirements preferably

Satisfy the intersection traffic requirements very well

Satisfy the intersection traffic requirements basically, sedan cars need circumvention

Satisfy the intersection traffic requirements basically, sedan cars need circumvention

Engineering scale

900m total length,530m tunnel,ground road area is 15242 m2. forward ramp bridge deck area is 2590 m2

900m total length,420m viaduct with bridge deck area is 3780 m2

,

ground road area is 19474 m2. forward ramp bridge deck area is 1350m2

900m total length,530m tunnel,ground road area is 11178 m2, forward ramp bridge deck area is 2590 m2

900m total length,420m viaduct with bridge deck area is 3780 m2

,

ground road area is 13756 m2. forward ramp bridge deck area is 1350m2

Engineering cost

2 3 1 (highest) 4 (lowest)

Floor area 1 (most) 2 3 4 (least)

Construction technology

mature construction technology

mature construction technology

mature construction technology

mature construction technology

Influence to traffic during construction period

Less influence More influence Less influence More influence

2.Scheme introduction – Scheme comparison

By the

comprehensive

comparing of four

schemes as shown

in above sheet, we

recommend

adopting scheme 4.

Ramp bridge D

Relief road

Mainline viaduct

Ground road

2.Scheme introduction – Recommended scheme

3. After the project completion, northward traffic condition will be greatly improved, but vehicles to south area have to circumvent for a long distance, or run along road C connecting to the existing bridge, go into south area. Along with the traffic volume increasing, traffic pressure of the bridge and intersections near it will become more and more huge. So we suggest increasing westward artery in future, reconstructing road B, building a new over bay bridge connecting to the downtown, which will greatly improve the traffic environment of the whole road network.

1. With no geological information, pile diameter and pile length are all design by experience, so we suggest the owner to ascertain the geologic condition of project site especially the viaduct location, so as to deepen the design.

2. Road broaden engineering may need to adjust the railway line or influence the railway normal operating, so we suggest that coordinating work with relevant government department should be done firstly to determine the final design scheme. If the railway can be abolished, the bridge length will be more shorter, and the construction cost will be more cheaper.

4.The existing intersection is the main exit way of port area, so the traffic will be greatly influence during the project construction period. We suggest that temporary road traffic organization should be done before the project construction, make sure the normal operating traffic during the construction period.

3.Existing problems and suggestions

THANKS

Let the world more smoothly

3.Existing problems and suggestions

South-north direction main

road

3.Existing problems and suggestions

Existing bridge

Main road to south

Main road to north

3.Existing problems and suggestions

Existing bridge

South-north main road

New bridge

Road B

New road

Recent main traffic direction

Forward main traffic direction

Fishing port

Green area

3.Existing problems and suggestions