AFTHAP m4 10.03 1 Luis A. Agudo Fernández AFTHAP CONFERENCE REINFORCED AND PRESTRESSED CONCRETE...
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Transcript of AFTHAP m4 10.03 1 Luis A. Agudo Fernández AFTHAP CONFERENCE REINFORCED AND PRESTRESSED CONCRETE...
AFTHAP m4 10.031
Luis A. Agudo Fernández
AFTHAP CONFERENCE www.afthap.com
REINFORCED AND PRESTRESSED CONCRETE PIPE, STEEL CYLINDER TYPE
Module 4:Significant features
Final Summary
2AFTHAP m4 10.03
Reinforced concrete steel cylider type experiences since 1984
Year Name DiameterLength
(m)Pressure (m.w.c)
1894Outfall in
Paris1.800 mm 1.500 m 35
1895-1905
City of Paris
300 to 400 120.000 40
500 to 800 70.000 40
1.000 to 1.250
38.000 40
500 1.200 40
2.000 1.500 30
City of Nimes
800 2.500 35
Verifiable references, 4400 km since 1958› Around 3500 manufactured by AFTHAP associates
They can be reviewed on www.afthap.com
AFTHAP m4 10.03 3
Experience of AFTHAP
Specific manufacturing at the pull of the customer Adaptability to standard, use, load, installation
conditions, environment, and so.
AFTHAP m4 10.03 4
Versatility
Strength to ovalizing strains based on the pipe itself and not on extraordinary fillings
Impact and extreme temperatures strength Buoyancy almost zero (depending on diameters and
thicknesses)
AFTHAP m4 10.03 5
Robustness
AFTHAP m4 10.03 6
It does not require complicated tests of the weldings, penetrating liquids test is enough
It can bear longitudinal tractions, for examplen in the case of self anchored pieces
There is no limit to the use in pressure or diameter
It admits small bend radius, hard alignments in plan and elevation.
Possibility of using a welded joint
AFTHAP m4 10.03 7
It allows small movements, differential settlements, earthquake.
Electrical discontinuity. Really simplified joint, it avoids certified welders
and checking the joints on site. It avoids joint protections on site. It requires few equipments for the assembly. Speed of execution, less occupancy time.
Possibility of using an elastic joint
AFTHAP m4 10.03 8
They do not require preservation measures Steels are passivated with the concrete alcaline
pH. The reduction produced by the alcaline pH
prevents the reinforcements oxidation. Head loss usually decreases with time. The
concrete surface remains undisturbed and it almost always, depending on water, produces a layer of thin silt which makes it more slippery.
Durability
Very high failure critical pressure for negative pressures – It does not buckle easily
Good fatigue behavior Good behavior for variable stresses (fluttering
pressure variations) Good strength to handlings during the transport
and assembly
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Strength to transient and/or accidental strains
AFTHAP m4 10.03 10
Madrid, Plaza de Castilla, reinforced concrete, in use since 1949.Manhole making in (55 years)
Alhama, Murcia, prestressed concrete, in use since 70´s.Manhole making in 2009 (around 40 years)
Passivating
Turbulence production next to the duct wall Accurate formulas are valid (Darcy, Colebrook) The Hazen Williams formula that includes a correction
factor depending on the diameter is quite rough In all of them, the roughness factors are in the safe side,
because of their experimental determination, between 1939 and 1775, with pipes shorter and rougher than current ones
For big diameters, the pipe capacity is almost the same in any material
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Influence of roughness
AFTHAP m4 10.03 12
Madrid, Plaza de Castilla, reinforced concrete, in use since 1949.
Reduction on the head loss in time
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Alhama, Murcia, prestressed concrete, in use since 70´s.
Reduction on the head loss in time
Lower energy consumption during manufacturing Non-polluting manufacturing Very long useful life Non-polluting residue Reuse possibility (high and very high strength
concretes)› Detailed documentation on www.afthap.com,
documentation from the 2005 and 2007 seminar
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Sustainability
European standards UNE – EN › 639 Common requirements› 641 Reinforced concrete cylinder type› 642 Prestressed concrete cylinder type› 805 Systems and components outside buildings
Instruction of Eduardo Torroja Institute for reinforced or prestressed concrete pipes 2007
Certification with DIT
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Standardization
The development of a Technical Suitability Document (DIT) includes:
The preparation of a detailed manual on manufacturing and use approved by a comission of experts created for this purpose by the certification body.
Tracking with periodical controls› All the documentation is public. The one related to
reinforced and prestressed concrete pies, steel cylinder type, can be obtained from www.afthap.com
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Certification by DIT