This project involves the route survey which includes:
reconnaissance survey, theodolite traversing and leveling operations as well as
soil tests which includes; plastic limit test, liquid limit tests and moisture
content determination, compaction tests and California bearing ratio tests.
This project also involves the design of the pavement and the
geometric design of the roadway.
TABLE OF CONTENTS
1.1 General Introduction
1.2 Reconnaissance survey
1.3 Geometric design
1.4 Factors influencing the choice of station
1.5 Factors which favour the selection of route or
1.6 Aim and objective of the project
1.7 Scope of the project.
2.1 Brief description of the
2.2 Theoddolite traversing
2.3 Procedure for traversing
2.4 Traversing instruments
2.5 Conversion to whole circle bearing
3.2 Longitudinal sections or profiles
3.3 Cross section
3.4 The need for sections
3.5 The purpose, uses and importance of leveling.
3.6 Instrument used in leveling
3.7 Terminologies used in leveling
3.8 Levelling procedure
3.9 Earth work computation
3.10 Volume computation
4.1 Collection of samples
4.2 Laboratory soil test
4.3 Type of laboratory test carried out
4.4 Compaction test
4.5 California bearing ratio test
4.6 Computation of CBR test result
4.7 Mechanical analysis
4.8 Atterberg limit test
4.1 Liquid limit test
4.2 Plastic limit test
4.3 Pavement design
4.4 Function of the components of a flexible road
4.5 Group index method of pavement design
4.6 Design data using CBR method.
5.2 Factors affecting the design of curves
5.3 Types of curves
5.4 Advantages of transition curves
5.5 Super elevation
5.6 Design of the horizontal curve
5.7 Criterial for the choice of the formation line.
5.8 Vertical curves
5.9 Stages of work in the actual road construction
5.10 Equipment used for the actual road construction
The relevance of road to life and its activities cannot be over
Road is as old as the origin of man and plays a vital role in the
life of the people in communities, states, countries. It is quite obvious that
life would have been very difficult without the existence of roads. Nigeria for
instance acknowledged the importance of road such that the local, state and
federal government are all involved in the development and maintenance of road
History has shown that provision of roadway is a necessary tool
for civilization. It advances prosperity increase and this bring about demand
for better and faster communication facilities especially roads.
The continuing increase in Nigeria’s population has made the daily
movement of passengers and goods an increasing complex problem.
This is a quick type of survey or a rapid examination of the
ground and its adjacent natural features usually made without survey instruments
to limit the alternative routes in terms of cost to one or two.
The following factors are normally considered in reconnaissance
cartage of goods
to road materials quarries
v Right of
way or road land
v Type of
v Number of
major and minor bridges
length and cost
along the alignment
The road under consideration (A by pass from IMT/ Federal
Secretariat road to Industrial center and Mass Communication Department) has
been graded and motor drivers and pedestrians use it. On the sides of the
proposed road are existing buildings and farm lands.
The traffic capacity of the road is low because of the poor
grading of the road.
Because the road has not been properly paved, less pedestrians use
the road and motorist prefer going through the longer way by passing through
mass communication department when going to industrial center.
When the road is properly improved, all these problems will be
eliminated and a lot of benefit will be accrued, benefit to the intending
business center as a result of more people using the road and reduction in
1.3 GEOMETRIC DESIGN
This is the aspect of the highway design that is solely meant to
take care of the road user and level of service rendered to him. The paramount
factor of consideration included expected traffic capacity, design speed and
volume. O’ Elaharty E. A in his book “Highway Traffic Planning and Engineering”
states that proper geometric design will inevitably reduce the number and
severity of highway accidents while ensuring high traffic flow with minimum
delay. He continued by saying that improper design would result in the early
obsolesce of the new highway with constant economic loss to the community.
1.4 FACTORS INFLUENCING THE CHOICE OF STATION
a. Easy Measuring Condition: Stations were chosen
to avoid obstacles during drainage or tape exercise.
b. Intervisibility: Station were chosen and placed
such that the station does not obstruct the other station line of sight.
c. Tranversing at closed Distance should avoided:
This is to avoid angular error that would be introduced there to target at
short range not be properly bisected.
1.5 FACTORS WHICH FAVOUR THE SELECTION OF ROUTE OR
There are several factors which normally favour the selection of a
route alignment for high way construction.
i. The route should be as straight as possible.
This implies less cost of construction, maintenance and operation of vehicles
as wear and tear on curves route are entirely eliminated.
ii. Vertical and horizontal elignment should be
eased out with maximum radius of curvature in relation to the design speed and
maximum route of superelevation.
iii. Good sight distance should be maintained. Sight
distance or visibility is the distance measured along the center line of the
road over which the driver can see the opposite object on the road for
necessary application of brake.
iv. Applicability of proper road drainage: Immediate
evacuation of rain water on pavements as well as embarkment of a highway is
necessary is to last till the end of the design life generally taken as 20years.
v. Availability of road building materials such as
stone, gravel, sand, laterite etc along the highways bring down the cost of the
construction as well as maintenance cost.
vi. Good formation soil should be ensured.
1.6 AIM AND OBJECTIVE OF THE PROJECT
This aims at giving student practical knowledge in the design of a
roadway in order to aid her in designing a related project in real practice in
1.7 SCOPE OF THE PROJECT
The scope of this project includes the leveling, theodolite
traversing of the road, design of the curve, soil investigation and pavement
design of the route of study.
TERMS AND CONDITIONS APPLY
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