BS DD76-2(1983) : 1983
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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PRECAST CONCRETE PIPES OF COMPOSITE CONSTRUCTION - PRECAST CONCRETE PIPES STRENGTHENED BY CHOPPED ZINC-COATED STEEL FIBRES
Hardcopy , PDF
18-11-2002
English
01-01-1983
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Foreword
Committees responsible
Draft for Development
Section one. Specification
1. Scope
2. Definitions
3. Cement
4. Aggregates
5. Other concrete materials
6. Concrete
7. Chopped steel fibre
8. Nominal size (DN)
9. Manufacturing diameter and actual diameter
10. Permissible variation in the thickness of wall
11. Squareness of ends
12. Permissible deviation from straightness
13. Permissible irregularity of internal surface
14. Joints
15. Marking of units
16. Effective lengths of pipes
17. Crushing test loads for pipes
18. Bends
19. Junctions
Section two. Tests
20. Assessment and acceptance of units
21. Test requirements and recommendations
22. Type of inspection and batch size
23. Inspection procedures for units
Appendices
A. Information to be given in connection with an
enquiry and order
B. Method for measuring fibre content of mixes
C. Method of measurement of deviation from straightness
D. Tests for fibre distribution and water absorption
E. Hydrostatic test
F. Crushing strength test for pipes
G. Tests of pipe joints for angular deflection,
straight draw and shear
H. Method of measurement of surface irregularity
Tables
1. Nominal sizes and permissible tolerances for units
2. Crushing test loads
3. Minimum effective lengths and permissible angles
for bends
4. Right-angled junctions
5. Oblique-angled junctions
6. Summary of test requirements and inspection
procedures
7. Minimum angular deflection and straight draw for
joints
8. Maximum number of individual defectives in last 10
batches permitted for switching to reduced
inspection (hydrostatic or works proof load crushing
test)
9. Inspection plans for hydrostatic and works proof
load crushing tests
Figures
1. Effective length of units
2. Typical flexible joints for pipes
3. Typical bends
4. Typical junctions
5. Nominal zones where crack widths are permitted
during maximum load test
6. Joint test measurements
7. Gauge for measuring deviation from straightness
8. Testing arrangement for the crushing test
9. Dimensions of feeler gauge for measuring crack
widths
10. Loading arrangement for shear test on joints
11. Gauge for measuring surface irregularity
Describes precast concrete cylindrical pipes, bends and junctions strengthened by chopped zinc-coated steel fibres and intended to be used for the carrying, under atmospheric pressure, of sewage or surface water, and for the construction of culverts. A range of nominal sizes of units is covered, namely DN 375 to DN 1200, by increments of 75, and minimum crushing strengths, as determined by standard tests, is given for each nominal size of pipe.
| Committee |
CAB/12
|
| DocumentType |
Standard
|
| Pages |
20
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| BS 4485-4:1996 | Water cooling towers Code of practice for structural design and construction |
| BS 8005-1:1987 | Sewerage Guide to new sewerage construction |
| BS 957-2:1969 | Specification for feeler gauges Metric units |
| BS 903-A26:1969 | Physical testing of rubber Determination of hardness |
| BS 812-1:1975 | Testing aggregates Methods for determination of particle size and shape |
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