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Guide to the design of thrust blocks for buried pressure pipelines

Series/doc. No Report Report R 128
Year 1994
Abstract A design guide for thrust blocks to restrain the forces generated by changes in direction of fluid flow in jointed buried pressure pipeline networks. A step by step design approach is detailed, principally for thrusts up to 1,000kN, limiting the pressure range, pipe diameter and the thrust block sizes. While the theory can be applicable to any circumstances, the design of large scale thrust blocks is not covered.
ISBN 9780860173595
Subject(s) Civil engineering, infrastructure and public utilities
Supplement Civil & Structural. To subscribe to The Construction Information Service please telephone Customer Care on +44 1344 328300
Publisher CIRIA
Publisher History CIRIA was formerly known as the Construction Industry Research and Information Association. They are a member-based research and information organisation who publish reports and technical papers covering building and civil engineering as well as transport and utilities infrastructure.
Table Of Contents
List of figures 8
List of tables 9
Glossary 10
Notation 15
1 Introduction 17
1.1 Scope 17
1.2 General principles 18
2 Design 20
2.1 Classification of design 20
2.2 Step 1 - locate position of thrust blocks 22
2.3 Step 2 - calculate the magnitude of the design force 24
2.4 Step 3 - estimate ground conditions 27
2.5 Step 4 - identify direction of the design forces 27
2.6 Step 5 - determine ground properties 28
2.7 Step 6 - determine thrust reaction factor 32
2.8 Step 7 - estimate block size for horizontal bends and calculate ultimate horizontal ground resistance 35
2.9 Step 8 - calculate thrust block size to resist horizontal forces 38
2.10 Step 9 - estimate thrust block size for upturn bends and calculate ultimate bearing resistance 38
2.11 Step 10 - calculate thrust block size to resist downward forces at upturn bends 39
2.12 Step 11 - estimate thrust block size for downturn bends and calculate the effective weight W 40
2.13 Step 12 - determine minimum thrust block size to suit pipe and excavation dimensions 41
2.14 Step 13 - review the design of each thrust block and revise as necessary 41
2.15 Step 14 - prepare dimensioned design 41
3 Construction details 42
3.1 Typical shapes for thrust blocks 42
3.2 Installation 48
4 Examples 55
4.1 Introduction 55
4.2 Example 1 55
4.3 Example 2 60
References 67
Bibliography 68
Appendices 69


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