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CHAPTER 3

Civil engineering and building works

1Introduction

2Geotechnical investigations

2.1General and desk studies

2.2Geophysical investigations

2.3Trial excavations and boreholes

2.4In-situ tests

2.5Groundwater investigations

2.6Ground description and classification

2.7Laboratory tests

2.8Factual reports

2.9Interpretation of site investigations

3Seismic hazard assessment

3.1Geology

3.2Earthquakes

3.3Crustal dynamics

3.4Ground motion hazard

3.5Ground rupture hazard

4Types of foundations

4.1Isolated column foundations

4.2Strip foundations

4.3Raft foundations

4.4Cellular raft foundations

4.5Piled foundations 4.5.1 Displacement piles

4.5.2 Replacement piles

»

4.6Caisson foundations

4.7Anti-seismic foundations

5Foundations design and construction

5.1Concrete

5.2Bearing pressures and settlement

5.2.1Consolidation settlement

5.2.2Plastic settlement

5.2.3Settlement due to changes of conditions

5.3Test piling

6Foundations for main and secondary structures

6.1Boiler house foundations

6.2Turbine hall foundations

6.3Turbine-generator blocks

6.4Basement of ground floor

6.5Track hoppers

6.6Chimney foundations

6.7Cooling tower foundations

6.7.1The cooling tower shell and shell support columns

6.7.2The packing support structure

6.7.3The pond floor

6.7.4The distribution culvert

6.8Reactor foundations

7General site works

7.1Flood embankments

7.2Roads

7.3Drainage

7.4Railways

7.5Coal storage

7.6Oil tank compounds

7.7Ash disposal areas

8Methods of construction

8.1Site clearance, access roads and construction offices

8.2Underground construction

8.2.1Cofferdams

8.2.2Compressed air or pneumatic caissons

8.2.3Monoliths

8.3Groundwater lowering

8.4Excavating machinery

8.4.1Dragline

8.4.2Backacter

8.4.3Face shovel

8.4.4Grab

8.4.5Excavator

8.4.6Tractor shovel and loader

8.4.7Scraper

8.5Construction by diaphragm walling techniques

8.6Formwork and reinforcement

8.7Mixing and placing of concrete

9Direct cooled circulating water systems

9.1Civil engineering structures in direct cooling systems

9.2Culverts

9.3Pumphouse and screen chamber intake

9.4Cooling water tunnels

9.5Submersible cooling water structures

9.6Maintenance considerations

10Harbours and jetties

10.1General

10.2Types of harbours and jetties

10.3Construction of harbours and jetties

11Loadings

11.1Definitions

11.2Imposed loads due to plant

11.3Distributed imposed loads

11.4Cranes

11.5Wind and snow loads

11.6Reduced loadings in main beams and columns

11.7Design loadings

. 11.8 Extreme loadings for nuclear stations

12Steel frames

12.1Steelwork

12.2Design of members

12.3Connections

12.4Protection of steelwork

13Reinforced concrete

13.1General

13.2 Formwork .

_______ .........................

13.3Reinforcement

13.4Design of reinforced concrete

13.4.1Non-seismic-resistant design

13.4.2Seismic-resistant design

13.5Movement joints

13.6Curing

13.7Precast concrete '

14Prestressed concrete

14.1Prestressing

14.2Prestressed piling

178

14.3 Prestressed concrete pressure vessels and containments

Brickwork and blockwork

15.1General

15.2Bricks

15.3Mortar

15.4Brickwork

15.5Blocks

15.6Blockwork

15.7Damp-proof courses

15.8Openings

Lightweight walling systems

16.1Sheeting

16.2Insulation

16.3Fixings

16.4Durability

Roofing

17.1Structural elements

17.2Insulation and weatherproofing layers

17.3Application to power stations

17.4Durability

17.5Rainwater disposal

Finishes

18.1Floor finish considerations

18.2Types of floor finish

18.3Finishes to walls and ce' igs

18.4Wall tiling and other special finishes

18.5Internal painting

18.6External painting

I Turbine hall and boiler house construction

19.1General

19.2Structural considerations

19.3Erection of steelwork

19.4Cladding

19.5Ventilation

19.6Floor and wall finishes

) Reactor construction

20.1Reactors

20.2Reactor buildings

I Ancillary buildings

21.1General

21.2Control room building

21.3Gas turbine house

21.4CW pumphouse

21.5Coal, dust and ash plant buildings

21.6Workshops and stores

21.7Offices, welfare blocks, laboratories and similar buildings

22Chimneys, cooling towers and precipitators

22.1Chimneys

22.2Cooling towers

22.3Precipitators

23Architecture and landscape

23.1General power station architecture

23.2Landscape considerations

23.3Preparatory works

23.4Landscape layout

24Regulations

24.1Government instruments

24.2Factories Act

24.3Health and Safety at Work Act, 1974

24.4Building regulations

24.5Nuclear station licensing

24.6Offices, Shops and Railway Premises Act

25Civil, engineering contracts

25.1Special aspects of civil engineering contracts

25.2Forms of contract

25.2.1Turnkey contracts

25.2.2Lump sum contracts

25.2.3Remeasurement contracts

25.2.4Target/cost contracts

25.2.5Cost reimbursable contracts

25.3Contract strategy

25.3.1Extent of civil engineering work

25.3.2Type of contract

25.3.3Extent of contract

25.4Contract placing'

25.4.1Programme

25.4.2Invitation to tender

25.4.3Tender documentation

25.4.4Return of tenders

.' 25.4.5 Tender appraisal

25.4.6Tender acceptance

25.5Contract administration

25.5.1General

25.5.2Specific quality

25.5.3Programme requirements

25.6Budgetary approval and control

25.6.1General

25.6.2Changes in design

25.6.3Design development

25.6.4Site instructions

25.6.5Additional costs

26 References

Appendix

A Estimation of the carrying capacity of piles

Introduction

 

sometimes at, but more materially below, ground level.

 

Firstly, methods of soil and rock investigation are

 

 

he construction of a power station can be divided

reviewed and then there are basic descriptions of foun-

anvenicntly into two components. These are construc-

• dation types in general use. This leads to a discussion

on below ground level — foundations, and construc-

with examples of reinforced concrete foundations of

on above ground level — superstructure. Accordingly

typical main and secondary structures. Section 7 con­

lis chapter has been split likewise.

 

siders other works which are not strictly classified as

Sections 2 to 10 of this chapter are devoted to matters

foundations but are encompassed by civil engineering

;lated to foundations and some structures which are

and are often of a site preparatory nature. In Section 8

holly or primarily below ground while Sections 11 to

primary construction methods are discussed for land

2 relate to superstructures and construction

above

sited works.

round level. Let us define those matters which

are to

River and sea works normally associated with coolirtg

e covered under foundations. These structures and

water systems are considered in Section 9, followed by

instructions are very often in reinforced concrete.

 

an outline of the works and methods of construction

179

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