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PD CEN/TS 15223:2025 - TC Tracked Changes. Plastic piping systems. Structural design of buried thermoplastics piping systems. Procedure and guidance under various conditions of loading, 2025
- A-30479133.pdf [Go to Page]
- undefined
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviations [Go to Page]
- 4.1 Symbols
- 4.2 Abbreviations
- 5 Structural design [Go to Page]
- 5.1 General
- 5.2 Procedure
- 5.3 Design by graph [Go to Page]
- 5.3.1 Boundaries for design by graph
- Table 1 — Boundaries for structural design parameters, design graph [Go to Page]
- 5.3.2 Approach
- 5.3.3 Deflection target values after backfilling (installation phase)
- Figure 1— Structural design graph –Initial relative pipe deflection after trench backfilling [Go to Page]
- 5.3.4 The settlement phase
- Figure 2 — Structural design graph – Development of deflection during settlement phase [Go to Page]
- 5.3.5 Values for final relative deflection
- Figure 3 — Structural design graph — Long-term pipe deflection [Go to Page]
- 5.4 Design by calculation method [Go to Page]
- 5.4.1 Boundaries for design by calculation
- 5.4.2 Approach
- 5.4.3 Background
- Table 2 — Boundaries for structural design parameters, calculation [Go to Page]
- 5.4.4 Loads [Go to Page]
- 5.4.4.1 General
- 5.4.4.2 Soil load
- 5.4.4.3 Traffic loads
- Table 3 — Load Model 1: Characteristic values
- Figure 4 — Load model LM1 for road traffic, from EN 1991-2:2003
- Figure 5 — Mean value of traffic load, load case LM1 [Go to Page]
- 5.4.4.4 Railway traffic
- 5.4.4.5 Ground water load
- 5.4.5 Ring deflection [Go to Page]
- 5.4.5.1 Load distribution model
- Figure 6 — General load distribution model [Go to Page]
- 5.4.5.2 Soil modulus
- Table 4 — Constrained soil modulus, Ms [Go to Page]
- 5.4.5.3 Deflection caused by soil fill
- Table 5 — Coefficient b1 as function of the support angle at the bottom of the pipe α, and the load distribution angle at the top of the pipe, β [Go to Page]
- 5.4.5.4 Deflection caused by traffic load
- Table 6 — Estimated values for the coefficient C1 [Go to Page]
- 5.4.5.5 Long term deflection
- Table 7 — Suggested values for If, Bf and DL [Go to Page]
- 5.4.6 Ring forces [Go to Page]
- 5.4.6.1 Bending strain and bending moment
- 5.4.6.2 Ring normal force
- 5.4.6.3 Combined maximum long term strain
- 5.4.7 Buckling
- Figure 7 — Correction factor for the buckling resistance as a function of deflection
- Annex A (informative) Example structural design graph method
- A.1 Introduction
- Figure A.1 — Initial relative deflection as a function of ring stiffness and installation class
- A.2 The pipe ring stiffness to be prescribed
- Figure A.2 — Example of ring stiffness as a function of initial relative deflection and installation class
- A.3 The expected final deflection
- Figure A.3 — Example of initial relative deflection as a function of ring stiffness and installation class
- Annex B (informative) Example design by calculation method
- B.1 Introduction
- B.2 Input parameters
- B.3 Calculated data
- Annex C (informative) Time dependency of stress and strain
- Annex D (informative) Soil/pipe behaviour
- Annex E (informative) Typical limits of structural performance for non-pressure pipes
- Table E.1 — Typical limits of structural performance for non-pressure pipes
- Annex F (informative) Special conditions
- F.1 General
- F.2 Installation at depths shallower than the expected frost penetration
- Figure F.1 — Examples of thermal insulation of buried pipes
- Bibliography
- Blank Page
- 30550019.pdf [Go to Page]
- National foreword
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviations [Go to Page]
- 4.1 Symbols
- 4.2 Abbreviations
- 5 Structural design [Go to Page]
- 5.1 General
- 5.2 Procedure
- 5.3 Design by graph [Go to Page]
- 5.3.1 Boundaries for design by graph
- Table 1 — Boundaries for structural design parameters, design graph [Go to Page]
- 5.3.2 Approach
- 5.3.3 Deflection target values after backfilling (installation phase)
- Figure 1— Structural design graph –Initial relative pipe deflection after trench backfilling [Go to Page]
- 5.3.4 The settlement phase
- Figure 2 — Structural design graph – Development of deflection during settlement phase [Go to Page]
- 5.3.5 Values for final relative deflection
- Figure 3 — Structural design graph — Long-term pipe deflection [Go to Page]
- 5.4 Design by calculation method [Go to Page]
- 5.4.1 Boundaries for design by calculation
- 5.4.2 Approach
- 5.4.3 Background
- Table 2 — Boundaries for structural design parameters, calculation [Go to Page]
- 5.4.4 Loads [Go to Page]
- 5.4.4.1 General
- 5.4.4.2 Soil load
- 5.4.4.3 Traffic loads
- Table 3 — Load Model 1: Characteristic values
- Figure 4 — Load model LM1 for road traffic, from EN 1991-2:2003
- Figure 5 — Mean value of traffic load, load case LM1 [Go to Page]
- 5.4.4.4 Railway traffic
- 5.4.4.5 Ground water load
- 5.4.5 Ring deflection [Go to Page]
- 5.4.5.1 Load distribution model
- Figure 6 — General load distribution model [Go to Page]
- 5.4.5.2 Soil modulus
- Table 4 — Constrained soil modulus, Ms [Go to Page]
- 5.4.5.3 Deflection caused by soil fill
- Table 5 — Coefficient b1 as function of the support angle at the bottom of the pipe α, and the load distribution angle at the top of the pipe, β [Go to Page]
- 5.4.5.4 Deflection caused by traffic load
- Table 6 — Estimated values for the coefficient C1 [Go to Page]
- 5.4.5.5 Long term deflection
- Table 7 — Suggested values for If, Bf and DL [Go to Page]
- 5.4.6 Ring forces [Go to Page]
- 5.4.6.1 Bending strain and bending moment
- 5.4.6.2 Ring normal force
- 5.4.6.3 Combined maximum long term strain
- 5.4.7 Buckling
- Figure 7 — Correction factor for the buckling resistance as a function of deflection
- Annex A (informative) Example structural design graph method
- A.1 Introduction
- Figure A.1 — Initial relative deflection as a function of ring stiffness and installation class
- A.2 The pipe ring stiffness to be prescribed
- Figure A.2 — Example of ring stiffness as a function of initial relative deflection and installation class
- A.3 The expected final deflection
- Figure A.3 — Example of initial relative deflection as a function of ring stiffness and installation class
- Annex B (informative) Example design by calculation method
- B.1 Introduction
- B.2 Input parameters
- B.3 Calculated data
- Annex C (informative) Time dependency of stress and strain
- Annex D (informative) Soil/pipe behaviour
- Annex E (informative) Typical limits of structural performance for non-pressure pipes
- Table E.1 — Typical limits of structural performance for non-pressure pipes
- Annex F (informative) Special conditions
- F.1 General
- F.2 Installation at depths shallower than the expected frost penetration
- Figure F.1 — Examples of thermal insulation of buried pipes
- Bibliography [Go to Page]
