JORNADA T

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AFTHAP CONFERENCE www.afthap.com
REINFORCED AND PRESTRESSED CONCRETE PIPE, STEEL
CYLINDER TYPE
Module 1 Description Regulations
Luis A. Agudo Fernández
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design

• The pipe is custom-designed, for the pressure and
  installation conditions along the longitudinal
  section of the pipeline.
• The structural condition of rigid pipe simplifies
  the trenches filling, allowing easy to achieve
  filling materials.
• The design is adapted to the compacting factor
  decided by the designer.

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Rating
The reinforcement of every stretch is adapted to
its conditions. That reduces the cost and
improves the coefficient of sustainability.
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Prestressed pipe, Alhama de Murcia, 70s, 0 36
atm
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Rigid pipe

• The design can be adjusted to the desired
  bedding and compacting factor.
• The filling material is not very demanding. The
  material from the excavation can be used as
  filling, except for special cases.

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Versatility to adjust to soil and alignment

• Adaja (Ávila), sandy soil, flooding compaction
• Curved alignment

• Siphon pipe of Casteleiro, heterogeneous soil
• High sloped alignment

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Different typologies for different circumstances

• Reinforced concrete, with steel cylinder

• Prestressed concrete, with steel cylinder
• Embedded-cylinder type
• Lined-cylinder type

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Different typologies for different circumstances

• Welded joint

• Bounded elastic joint

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Special pipes

• 3200 mm inside pipe, reinforced concrete,
  steel-cylinder

• Fittings

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Special pipes

• Self-supporting pipe Palmones 1986
• Surge tank

• Uderwater outfall
• Cogeneration plant

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Pipe for jacking
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Durability

• The concrete passivates the reinforcements and
  provides an efficient protection of the steel in
  the long term
• Pipes of the Canal de Isabel II in use since late
  40s.

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Inside coating keeps its properties without
degrading

• Pipe from Plaza de Castilla in Madrid, late 40s

• Pipes of the CAT, 80s

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Tradition
Francia 1894, 1200 mm

• Con acierto se ha dicho que, en el hormigón
  armado, el acero da fibra a la piedra mientras el
  hormigón da masa al acero. Es, por eso, el más
  técnico de todos y el único al que verdaderamente
  puede aplicarse el título de adecuo-resistente
• (Razón y ser de los tipos estructurales, Eduardo
  Torroja)

Madrid, 1947 (Canal Isabel II 1946-1950 Report)
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AFTHAP references since 1958
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AFTHAP references since 1958
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Regulations

• UNE-EN European Stantards
• 639 Common requirements
• 641 Reinforced concrete pipe, steel-cylinder type
• 642 Prestressed concrete pipe, steel-cylinder
  type
• 805 Requirements for system and components
  outside buildings
• Instruction of Eduardo Torroja Institute for
  reinforced and prestressed concrete pipes 2007

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Instruction of Eduardo Torroja Institute for
reinforced or prestressed concrete pipes

• It includes and broadens the UNE EN European
  Standards
• Updated in 2007 by the IETCC and CEDEX is one of
  the most modern and complete
• It meets all the conditions of the European
  standard and exceeds its requirements in some
  points
• The current manufacturing allows to meet and even
  exceed widely the requirements of the standards
  in some points

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STANDARDIZATION

• AFTHAP pipes have the DIT seal certified by the
  IETCC
• The DIT seal ranks with an EN seal, is applied
  when there is not product UNE standard, even
  though is more complete (includes use control in
  addition to manufacturing control)
• The documentation of the DIT is public, and can
  be consulted on our web www.afthap.com