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, 70´s,
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


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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

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Bounded elastic joint
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Special pipes

3200 mm inside pipe,
reinforced concrete,
steel-cylinder
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
Fittings
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Special pipes


Self-supporting pipe
Palmones 1986
Surge tank
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
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 40´s.

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Inside coating keeps its properties without
degrading

Pipe from Plaza de
Castilla in Madrid, late
40´s
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
Pipes of the CAT, 80´s
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Tradition
Francia 1894, 1200 mm

Con acierto se ha dicho que, en el hormigón
1947 (Canal
II 1946-1950
Report)
armado, el aceroMadrid,
da fibra
a la Isabel
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)
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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

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