Project Assigment

8/3/2019 Project Assigment

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AGREEMENT NO: WRM-PTC-105-08

CONSULTANCY SERVICES AGREEMENT

BETWEEN

WESTERN REGION MUNICIPALITY (WRM)

AND

TANGRAM ARCHITECTS AND DESIGNERS (TAD)

RELATING TO

STUDY, ASSESSMENT AND EVALUATION,

DESIGN AND SUPERVISION FOR

IMPROVEMENT, UPGRADING,

DEVELOPMENT AND MAINTENANCE OF THE

INFRASTRUCTURE FACILITIES AND PROJECTS

AT

GHAYATHI, SILA, THE ASSIGNED ISLANDS & COASTAL ROADS

SUBJECT: IMPROVEMENT & UPGRADE FOR GHAYATHI MAIN ROAD


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Table of Contents

List of Figures

Chapter.1: Introduction

1.1 Project Description

1.2 Study Objective

1.3 Project Stages

1.4 Adopted Methodology

Chapter.2: Data Collection

2.1 Existing Utilities

2.2 Existing Pavement Condition

2.3 Major Geometric Elements

Chapter.3: Site Visit & Main Findings

3.1 Introduction

3.2 Main Findings

3.4 Preliminary Recommended Option

3.5 Traffic Analysis

Chapter.4: Topographic Survey Works

4.1 Objective

4.2 Detailed Topographic Surveying

Chapter.5: Scope of Work & Construction Duration

5.1 Scope of Work

5.2 Construction Duration


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Chapter.6: Arrangement with relevant Authorities.

Chapter.7: Design Standards & Schematic Design

7.1 Introduction

7.2 Road Classification & Design Speed

7.4 Design Standards

7.5 Pavement Design

7.5 Attached Drawings

7.6 Construction Procedures

Chapter.8: Cost Estimations.

List of Figures

Figure 1: Existing Traffic Volumes

Figure 2: Surrounding Road NetworkFigure 3: Typical Cross SectionFigure 4: Projected Traffic Volumes (2030)Figure 5: Posted Speed 60 (KPH)Figure 6: Design Speed According to road ClassificationFigure 7: Design Control for Sag Vertical CurveFigure 8: Design Control for Crest Vertical CurveFigure 9: General Layout


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Chapter 1: Introduction

1.1 Project Description:

Tangram architects and designers (TAD) have been

contracted by the Western Region Municipality (WRM) to provide

professional engineering services through the provisions and requirements

outlined in the consultancy services agreement no. WRM-PTC-105-08. This

agreement details the principle engineering services to be provided by TAD

primarily covering the geographical areas of the towns of Ghayathi and Sila.

Other areas may be added as directed by WRM to potentially include assigned

islands and the Coastal Roads.

Ghayathi main road is considered a portion on the E15 route that links E11

with Liwa city it links Ghayathi city with Ruwais from the North Direction

and Liwa from the South Direction, this road started suffering from pavement

conditions problems resulting in reduction of level of service for the road users.

Accordingly Western Region Municipality has decided to improve and upgrade

the road so that the road will be capable to accommodate the anticipated

future increase of traffic volumes at the targeted level of service.

The following document has been referenced in the course of preparing this report:

y Road Design Manual - Roads and Bridges released from Abu Dhabi

Municipality, 2004, referred afterwards as ADRDM;

1.2 Study Objective: The main two objectives of the study are to design and supervise the

Improvement of Ghayathi Main Road for a length of 2.8 Km approximately.

Accordingly, the Consultant task is to achieve these two targets within

the optimum techno economic solution and meanwhile within the minimum

disturbance on the existing traffic flow.

This improvement would entail the following subjects:

y Adding two shoulders from both to improve safety to road users.

y Conducting consequent geometric modifications for intersections, lay bays,

road signs,

markings and street lighting.

y Relocating existing services and service reservation according to the

proposed improvements and widening.


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y Modifications of sidewalks and landscape areas near Major intersections

y Adding 3 roundabouts at stations 0+000, 0+967.505, 2+795.168.

1.3 Project Stages: The Consultancy Services for the project are divided into the following

three stages:

y Preparation of concept design report.

y Preparation of preliminary design drawings.

y Preparation of final design drawings and tender documents.

1.4 Adopted Methodology:

y To achieve the study objectives, the Consultant established his

adopted methodology as explained in the following steps:

y Initial discussions with WRM Infrastructure Sector.

y Data collection

y Data analyses, preparation of General Lay Out of Road.

y Site visit and visual inspection.

y Survey works

y Verification of collected data, preparation of Final Lay Out and

proposing

layout.

y Detailed discussions and coordination with relevant authorities.y Establishing Design Criteria.y Preparation of Schematic Preliminary Design and Design Report.

The following chapters comprise the detailed tasks conducted during each step of

the adopted methodology.


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Chapter 3: Site Visit & Main Findings

3.1 Introduction:

This chapter comprises different activities conducted during site visit. Main objectives of site

visit are:

y Verifying collected data based on the already prepared General Lay Out

drawing.

y Recording the existing cross section elements, road furniture and

characters supported with photos wherever required.

y Establishing a solid view for existing utilities.y Conducting a visual inspection for the existing pavement condition.

3.2 Main Finding:

y From Station 0+000 to station 2+795.168 existing asphalt condition is

very poor and needs to be either overlaid (milled and repaved) or totallyremoved and replaced

y Cross section elements are composed generally of a multilane dividedroad with two lanes in each direction and a landscaped median

y Few drainage inlets exists only near the major intersections that drain to

existing soak ways.

y The cross fall of carriage way drains surface water outwards

3.4 Preliminary Recommended Option

1. Widening Concept:

y Accordingly, based on site visit observation and after discussions with

WRM representatives the Preliminary Recommended Option is to widen

the existing road by adding the shoulders from both sides and maintaining

the existing median in the middle.

y Adding hard landscape strip 1.00m wide as a buffer zone between landscape area andasphalt edge.

y Adding 6.00m wide landscape area buffer between sidewalk and travelled

way

y Adding 3 roundabouts at the major intersections of the main road.

2. Existing accesses:

y Many access points are located along the main road, minor modifications

to the geometry of these accesses will be done regarding the turning radii

and width of circulating roadway.

Surrounding road network:

y Ghayathi main road in the study area is located in a comprehensive roadnetwork interconnected

y Zooming in on Ghayathi main road on the study area, the immediatesurrounding road network consists of a grid pattern that comprises the


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following:

y Eastern Road ( parallel to the main road)y Western Road (parallel to the main road)y 13st Street (from South)y 31

stStreet (from North)


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Figure 2 - Surrounding Road Network


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4. Road Section:

Proposed road section comprise of the following:

y 2 lanes in each directiony Inside shoulder 2.5m wide

y Outside shy distance 0.5my 5.00m landscaped median.y 1.00m hard landscape from both directionsy 6.00m soft landscape

Figure 3 shows typical proposed cross section


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Figure 3 - Typical Cross Section


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3.5 Traffic Analysis:

1. Introduction:

The purpose of the traffic analysis is to determine the capacity and configuration ofthe road and its adequacy over the 20 years design life. The 2030 Al Gharbiya master plan

was published 2009. Another report commissioned by WRM aComprehensiveInfrastructure Needs Analysis for the Western Region Municipality was prepared and

approved by WRM in December 2009. It complements the UPC plan and maderecommendations to achieve the Infrastructure goals aligned with master plan.

2. Modest Growth:

The Population growth in and around Ghayathi is projected to be modest, it is based on

expansion of agricultural activities and the need to provide increasing amount of food to

the Abu Dhabi emirate. Thus, Ghayathi will take an increasing role in the

production and transformation of food products. Available farm land is projected to

grow from 3,171 hec. To 3,457 hec. In 2030. The overall population is projected to

grow from 1400 to 15400 based on 1.64 persons per household and the projected jobgrowth. The projected daily trip generated based on land use is 27703.

3. Vehicle ownership:

According to Dubai Chamber of Commerce the UAE vehicle ownership is 0.54 per

capita. The comprehensive report suggested an approximate estimated ownership of7500

vehicles for Ghayathi.

4. Compound Traffic Growth:

Based on Macroeconomic factors listed above, TAD used a modest growth rate of 1% per

year(1.22 factor over 20 years).

5. Existing Traffic Volumes (2010):

15 minutes counts at different locations and at termini of the main road as it

enters and exits from Ghayathi were observed and recorded and design hourly

volumes were extracted as shown in figure 1

6. Projected Traffic Volumes (2030):

Projected traffic volumes were calculated on the basis of :

Projected Traffic volumes in 2030 = 1.22 * Current

Volume -Figure 4 shows projected traffic volumes in

2030.


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Figure 4 - Projected Traffic Volumes (2030)


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7. Conclusion and recommendations:

y As per Highway Capacity Manual Roundabout capacity variesfrom 900 to 1400 Vehicle/lane/hour.

y TAD propose to retain 2 lane on major road in each directionand 1 or 2 lanes onMinor roads

y Capacity is sufficient for analysis period; LOS (D)

was selected as a target level of

service in the project design life.

y Its recommended that major intersections of the

main road will be roundabouts

thats for capacity, safety , reserving right of

way and allowing for future expansion if needed.

y Based on observed traffic volumes and anticipated

volumes in 2030 the proposed3 R/A in the main intersections would maintain a

level of service expected to be

better than (D) in the main road corridor in the design

year (2030).


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5.1 Scope of Work

y Earthworks (Cut and/ fill up to formation level)y Laying sub gradey

Curbs at Intersectionsy Laying Sub basey Laying asphalt layers with prime and tack coat.y Installing sign boardsy Road markingy Street lightingy Storm watery Future ducty Utilities Relocation

5.2 Construction Duration

y Based on the scope of work the estimated duration for

construction would be 6 months.


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Chapter.6: Arrangements with Relevant Authorities

TAD had made correspondence with the following authorities for the provision

of existing and future utilities that are located or ought to be located in

the construction zone, and get their Non Objection Certificate regarding

the construction of the project:y General Leadership of Military Forces, Optical Fibres

Department.

y Abu Dhabi Transmission and Despatch Company (TRANSCO).y Department of Transport, Abu Dhabi, UAE.y Abu Dhabi Distribution Company, Electrical Construction sectiony Abu Dhabi Distribution Company, Water Construction Sectiony Etisalat, Head of Planning Sectiony Western Region Municipality, Town Planning Department

Hence TAD is waiting for the response from these authorities.


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Chapter 7: Design Standards & Schematic Design

7.1 Introduction:

The initial objective of the project is to improve the existing Ghayathi main road

adding two shoulders to the existing road. In view of the above mentioned, DesignStandards of the new carriage way would comply with the existing road

conditions. Regarding Intersections, the dualization will require adding new 3

roundabouts at Major Intersection points shall be kept subject to minor

modifications to match with WRM recommendation that no major utilities

relocation works are required. Eventually main aspects to be taken into consideration

are:

y All elements of Horizontal and Vertical

Alignments would follow the existingroad

Criteria.

y Cross fall of new lanes at the southern part of the

road from station 0+000 to

station 2+795.168, would have one slope

directed outwards away from the

median with the new proposed level, as shown in fig

y To conduct the required design, a Digital Terrain

Model (DTM) has been created by processing the

survey data using the specialized software.

y Based on this DTM plan and profile of existing

road has been developed so that the new designshould comply with the existing geometric

characters.

7.2: Road Classification & Design Speed:

y The existing road has been classified as an urban

frontage road collector from station 0+000 to

station 2+795.168.

y Based on the a.m., Design Speed shall be taken

initially 60 KPH and this initial

value shall be checked against existinghorizontal curves and super elevation

values to confirm the Final Design.

y Figure 5 a design speed 60 KPH for urban

frontage and stated that posted speed

is considered approximately 85% ofdesign speed

i.e. 50 KPH.


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Figure 6 - Design Speed According to road

Classification


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7.4 Design Standards:

y Road Design Manual - Roads and Bridges,

were used to extract Design Standards to be

adopted in the project:

1-Horizontal Alignment:

y Minimum Horizontal Curve: N.Ay Maximum super elevation rate(%): N.Ay Minimum super elevation transition length (m): N.Ay Axis of rotation: N.A

y Distribution of transition length: 2/3 of the

transition length will be placed on

the tangent preceding the circular curve, while 1/3of

the transition length will

be placed on the circular curve.N.A

y Use of spiral: no spiral curve will be used in thehorizontal alignment.

2-Vertical Alignment:

y Profile grade line location: The median edge of the pavementy Minimum grade: 0.2%y Maximum Grade: 3%y Minimum length of crest vertical curve : Figure 7y Minimum length of sag vertical curve: Figure 6y Absolute minimum length of vertical curve : 120m


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Figure 7 - Design Control for Sag Vertical Curve


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Figure 8 - Design Control for Crest Vertical Curve


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3- Cross Section Elements:

y Median width (m): As per ADRDM minimum width for medianin an arterial

main road is 5m, with a 22 cm high curb.y Travelled way width(m) : 7.30m for the new lanesy Shoulder Width(m): 2.50 Inside shoulder 0.50 Outer Shouldery Travelled way cross slope: 1.5%

4- Roundabouts:

y Minimum Island Diameter(m) : 40.00y Minimum width of circulating pavement(m): 12.00y Entry width(m): 9.00y Exit width(m): 9.00

5 - Intersections

Major Intersections:

Three new major Intersections are proposed to be constructed located along the study area atstations, 0+150, and 967.505, and 2+795.168 that are proposed to beroundabouts

Minor Intersections:

A number of right in /right outs are located along both sides of the road, following are the

basic consideration for the design of theses minor intersections:

y Design Vehicle: Sufficient

to cater for Buses and WB

Minimum Corner

Radii(m): 8.00

y Minimum width of right

turning roadway (m): 6.00

Deceleration Length: 40m

including taper.

y Acceleration length: 60m

including taper.

7.4 Schematic Design:

Geometric Design

y Geometric Design drawings attached to this

report comprise the following elements:

C.L:

y The existing road C.L. has been defined and drawn

along the centre of the existing

road.

y The proposed road centreline for the proposed road


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has been defined at the centre of the median.

y Road stationing has been conducted also based

on station 0+000 near Civil defence and increase

in the South direction and ends at station 2+795.168

Plan & Profiles:

Plan:

y Plan Drawings included in the drawings album

show the schematic design (plan) applying the

selected option from station 0+000 to station 2+795.

Profile:

y Based on survey works, a Digital Terrain Model

has been created and Profile of

existing pavement has been developed along

existing centre of single carriagewayroad .

y The proposed Profile Grade Line (PGL) will be at theedge of the newly constructed road.

y Elevations along the existing road were given at the

centreline of the existing road and drawn on the

profile drawings.

Cross sections

Typical Cross Section

Fig. 3 show the proposed Typical Cross Sections


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Figure 9 - General Layout


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Intersections:

Plan & Profile sheets included in the attached drawings shows the schematic

design of the new Intersections.

U-Turns:

No u-turns are allowed, it only can be done through the roundabouts at stations 0+150, 0+967.505 and at station 2+795.168 respectively

7.5 Pavement Design:

At this stage of the study it is recommended to follow the existing pavement layers

to assure simplicity of construction works especially that the existing pavement

has proved its efficiency at site conditions.

However, in the next stage (Detailed Design), the proposed layers shall be

checked based on Sub grade strength (C.B.R.) and Accumulative Standard Axle

Loads during the project Design Life.

Asphalt core test has been made to determine existing pavement layers, during

site visit it was noticed that the traffic volumes are very low, based on that

TAD has proposed a section that comprise of the following layers:

y Sub grade layer 30cm compacted in 2 layers CBR >30,compacted to 95% MDD

y Sub base layer 20cm with CBR>60, compacted to 98% MDD.y 10cm Asphaltic Concrete (A.C), Base coarsey 5cm Asphaltic concrete (A.C), Wearing coarse

7.5 Attached Drawings:

The drawings attached to the Concept Design Report can be summarized as ageneral layout out of the main road with the proposed modifications.

7.6 Construction Procedures

The construction procedures would comprise the following steps:

y Centreline setting out for the new road,y Fence Removal,y Removal of plantation such palm trees,y Utilities relocation (Etisalat lines, Lighting poles and low voltage

cables).y Lowering and adjusting the manholesy Lengthening of existing sleeves and ducts at road crossing of

utilities.

y Construction of new road.y Excavation/ ducting and cable pulling to street lightingy Installation of street lighting polesy Installation of new road signs,y Reinstatement of old signage as relevant,y Reinstatement of fencing to suit new road alignment and profile,y Road markings for the new roads and intersections


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Chapter 8: Cost Estimations:

This project will be in line with WRM 2010 capital projects approved cost.

Documents

Project Assigment