Plastic bellows for prestressed concrete bridge
1 Scope
This standard specifies the classification, structure, specifications, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage of plastic bellow products for prestressed concrete bridge.
This standard is applicable to plastic bellows used in post-tensioned prestressed concrete bridge structures, and may be used as a reference for plastic bellows used in other prestressed concrete structures.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8804.3 Thermoplastic pipes — Determination of tensile properties — Part 3: Polyolefin pipes
GB/T 8806 Plastics piping systems — Plastics components — Determination of dimensions
GB/T 9345.1 Plastics — Determination of ash — Part 1: General methods
GB/T 9647 Thermoplastics pipes — Determination of ring stiffness
GB/T 10802 General flexible polyether polyurethane cellular plastics
GB/T 11115 Polyethylene (PE) resin
GB/T 14152 Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method
GB/T 15820 Test of resistance to pull out of joints between polyethylene (PE) pressure pipes and fittings
GB/T 18742.1 Polypropylene (PP) piping systems for hot and cold water installations — Part 1: General
GB/T 19466.6 Plastics—Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)
GB/T 19472.1 Polyethylene structure wall pipeline system for underground usage — Part 1: Polyethylene double wall corrugated pipes
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
ring stiffness
pressure per unit area of pipe wall
3.2
flexibility
property of an object, which is not easy to be broken after being deformed by force
3.3
ash content
non-combustible substances left after burning under specified conditions
3.4
oxidation induction time (OIT)
time of the sample begins the autocatalytic oxidation reaction under the condition of high-temperature oxygen
3.5
true impact rate
ratio of the number of impact failures to total impacts, expressed as a percentage
4 Classification, structure and specifications
4.1 Classification
4.1.1 According to the cross-section shapes of plastic bellow sections, they are divided into:
a) circular bellow section, code C;
b) flat bellow section, code F.
4.1.2 According to the bellow joints of plastic bellows, they are divided into:
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification, structure and specifications
5 Technical requirements
6 Test method
7 Inspection rules
8 Marking, packaging, transportation and storage
Annex A (Normative) Specification of the bellow joint of plastic bellows
