WO2011116825A1 - Système de conduites à fluide - Google Patents

Système de conduites à fluide Download PDF

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Publication number
WO2011116825A1
WO2011116825A1 PCT/EP2010/053932 EP2010053932W WO2011116825A1 WO 2011116825 A1 WO2011116825 A1 WO 2011116825A1 EP 2010053932 W EP2010053932 W EP 2010053932W WO 2011116825 A1 WO2011116825 A1 WO 2011116825A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
fluid
tendon
utility fluid
utility
Prior art date
Application number
PCT/EP2010/053932
Other languages
English (en)
Inventor
Laurent Peguret
Original Assignee
Vsl International Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vsl International Ag filed Critical Vsl International Ag
Priority to PCT/EP2010/053932 priority Critical patent/WO2011116825A1/fr
Priority to AU2010349386A priority patent/AU2010349386A1/en
Publication of WO2011116825A1 publication Critical patent/WO2011116825A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/48—Special adaptations of floors for incorporating ducts, e.g. for heating or ventilating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/12—Tube and panel arrangements for ceiling, wall, or underfloor heating
    • F24D3/14—Tube and panel arrangements for ceiling, wall, or underfloor heating incorporated in a ceiling, wall or floor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Definitions

  • the invention relates the field of ducting utility fluids through a structure.
  • the invention relates to systems for circulating fluids through a building for purposes such as heating and cooling, or to systems for conveying fluids from one part of a structure to another for purposes such as ventilation, fire prevention and the like.
  • utility fluids are understood to mean any liquids or gases which are to be circulated through a structure, or conveyed from one part of the structure to another, for purposes related to the use of the structure.
  • Utility fluids to be circulated through the structure might include heating fluids (usually air or water) or cooling or air conditioning (such as air, water or a refrigerant), or cleaning (vacuum supply, for example).
  • Fluids to be delivered from one part of a structure to another include hot and cold water supplies, ventilation (air), or fire retarding fluids (water, foam, C0 2 ), for example.
  • Fluids are generally transported through buildings and similar structures using a network of pipes or ducts, which can be fitted during the construction of the structure, or after completion of the structure. In many cases it is important that the pipework and ducting be hidden, or at least routed around certain spaces in the structure.
  • the structures which are referred to in this application may include any structure, which comprises parts maintained in compression using tensioning elements enclosed within ducts.
  • Example include buildings or civil engineering structures such as walls, bridges, roads, tunnels, runways and power stations.
  • Such structures frequently use pre-stressing or post-tensioning (PT) tendons or similar elements in tension to hold parts of the structure in compression, such as concrete beams, pillars or floor or wall slabs.
  • PT post-tensioning
  • Pre-stressed concrete is commonly used for producing beams, floors, bridges and other structural elements which require a higher strength or a longer span than ordinary reinforced concrete.
  • Pre-stressing tendons are commonly used for producing beams, floors, bridges and other structural elements which require a higher strength or a longer span than ordinary reinforced concrete.
  • the invention can be used with the types of pre-stressing, such as unbonded post-tensioning, in which the stressing tendons are free to move at least longitudinally relative to the structure they are stressing.
  • unbonded tendons are commonly positioned in ducts or channels through the concrete.
  • tendons may be coated with grease and encased in a plastic sheath before being cast in the concrete, in which case the tendon is relatively free to slide within the sheath.
  • tendons may pass through free space, in which case they will still normally be enclosed in a sheath, a duct or a coating of some kind to protect the tendons from corrosion.
  • Post-tensioning is conventionally used in addition to conventional reinforcement using rebar steel (bars or rods of reinforcing steel). Indeed rebar steel may be used to provide or reinforce anchor points for PT tendons.
  • Ducts suitable for containing tendons are often pre-formed tubes made of an impermeable substance such as plastics or metal, and these tubes may be positioned in a volume which is then filled with concrete.
  • the tendons are fed through the ducts, an anchor is attached to one end of each tendon and a hydraulic jack is attached to the other end.
  • the jack puts the tendon under a predetermined amount of tension, taking into account the elastic behaviour of the tendon.
  • another anchor is used to secure the jacked end of the tendon and the jack is then removed, leaving the tendon in tension and the concrete therefore under compression.
  • crete shall be used throughout this application as an example of a structural material which is to be held in compression.
  • the invention also applies to any other materials and structures to which tensioning elements can be added, and the term “concrete” should be understood to include such materials and structures when interpreting this text.
  • steel cables and rods are given as examples of tensioning tendons, but the terms “steel” and “tendon” should be understood to refer to any kind of material which can be tensioned to put a structure under compression.
  • references to a single tendon should also be understood to include groups or bundles of tendons.
  • the term "fluid” is understood to mean a gas or a liquid. In the case of a liquid, the term is used to refer to substances which flow readily at the temperatures at which they are normally used.
  • Heating systems, cooling systems, ventilation, hot and cold water supply, fire-prevention, suction and other fluid systems which are installed in most buildings require the installation of pipework or ducting for conveying liquids or gases around the building.
  • Other types of concrete structure may also require fluid circulation systems - roadways, bridges or runways may for example incorporate pipework for ground source heat extraction, or for low- temperature heating to remove ice or snow from the surface, or for delivery of fire-extinguishing fluids to fire-prevention access points.
  • the circulation of fluids around a building is conventionally arranged by means of pipework or ducting which is fitted to the building once the structural work has been completed.
  • Pipework for underfloor heating/cooling systems also known as radiant hydronic systems
  • Pipework for underfloor heating/cooling systems is conventionally embedded in a screed laid on top of structural concrete. It has also been proposed to embed pipework in the structural concrete itself, and even to use tubular instead of solid rebar steel in concrete, such that the rebar tubes can be used for heating or cooling.
  • PT post-tensioned
  • Another disadvantage of conventional prior art post-tensioned (PT) structures is the need for separate sets of pipes or ducts, as well as separate installation procedures, for each of the various fluid circulation systems in the structure.
  • each extra set of pipework means an increase in the quantity of materials required for installation, an increase in the time and labour required, and the amount of space taken up by the pipework.
  • Tubular rebar elements occupy a significantly extra volume of concrete when compared with the equivalent rebar steel rods, and can therefore reduce the strength in compression of the structure.
  • the object of the present invention is to provide a method and system for conveying utility liquids in a structure in which the overall amount of material used for fluid circulation elements, the total amount of space occupied by the fluid circulation elements, and/or the installation time are reduced.
  • a further object of the invention is to provide a system for stressing a structure which avoids the need for a grouting process.
  • a further object of the invention is to provide a system for stressing a structure which facilitates a non-intrusive assessment of the state of the tendons and/or removal of the tendons for inspection.
  • the invention envisages a method of conveying a utility fluid through a structure, the structure comprising a tensioning element holding at least part of the structure in compression, and a duct enclosing the tensioning element, the method including conveying the utility fluid inside the duct.
  • the invention also envisages a system for conveying a utility fluid through a structure, the structure comprising a tensioning element holding at least part of the structure in compression, and a duct enclosing the tensioning element, the system comprising a first space inside the duct for accommodating the tensioning element, and a second space inside the duct for accommodating the utility fluid, a first connecting means for enabling the utility fluid to flow into the second space, and a second connecting means enabling the utility fluid to flow out of the second space, such that the utility fluid can flow from the first to the second connecting means through the second space.
  • the utility fluid is a thermal transfer fluid for heating or cooling the structure.
  • the utility fluid is a fire- retardant or fire extinguishing fluid
  • the second connecting means comprises a means of delivering the utility fluid to a region of the structure threatened by fire.
  • the utility fluid comprises a corrosion inhibiting agent.
  • the utility fluid is a liquid.
  • the utility fluid contains a wetting agent.
  • the structure comprises concrete, and in which the duct is at least partially embedded in the concrete.
  • the structure comprises a plurality of construction modules, each construction module comprising a section of duct, the sections of duct being provided with sealing connectors for sealably connecting the sections of duct of adjacent modules.
  • the duct is shaped such that it includes at least one bend.
  • Figure 1 illustrates a prior art post-tensioning (PT) arrangement.
  • Figure 2 illustrates a post-tensioning arrangement fluid circulation system according to the invention.
  • Figure 5 illustrates a variant of the fluid circulation paths in the invention.
  • Figure 6 illustrates a modular construction using the invention.
  • the invention can be applied to all fluid circulation systems which require fluid to be circulated around a post-tensioned structure.
  • Examples include radiant hydronic heating systems, cooling and refrigeration systems, ground source or similar heat collection systems, air conditioning, hot and cold water supply, sprinkler systems, delivery of fire-combating liquids or gases, drainage systems, suction or vacuum systems. It may be that the fluid circulation is only intended to be used rarely (as in a fire-prevention system), or only for a short time - as in the case where the fluid-filled PT ducts are used to heat or cool a concrete structure while it is being cast, to influence the rate of curing of the concrete or to protect it against extremes of temperature.
  • Each tendon (3) is anchored at both ends using a tendon anchor (5).
  • fluid flow connections to the duct (2) can be arranged as channels (1 1 ) through the tendon anchors (5). Alternatively channels can be provided separately from the tendon anchors (5). This latter arrangement is not illustrated.
  • Figures 3 and 4 show alternative tendon anchors with channel and connector arrangements for carrying out the present invention.
  • the channels are formed in the anchor, and connectors are provided on the outer side of the tendon anchor for connecting pipework to the duct (2).
  • the tendon anchors (5) are positioned over the open end of the duct (2) with a seal or gasket (1 6) to prevent the escape or entry of fluid once the anchor (5) is in place, once the tendon (3) is under tension and once the space (4) is
  • connections are secured using screw-on connectors (12) or a bolted flange arrangement (13) with gasket (1 6).
  • FIG. 6 shows a further embodiment of the invention, in which the structure (1 ) to be put in compression is a modular or segmental structure, comprising a number of modules or segments (1 ').
  • module and segment are used interchangeably in this text.
  • Each module is provided with a section of duct (2'), and the sections of duct (2') are sealably joined by a connector (6).
  • This variant may be constructed with external joining pipework
  • FIG. 7 shows an embodiment of the invention in which PT tendons are used in a multi- span arrangement, where one tendon can provide compression for multiple spans.
  • Using multi-span tendons means that larger volumes of a structure (1 ) can be placed in compression more quickly, and using fewer tensioning tendons (3) and anchors (5).
  • the concrete block (1 ) might form, for example, a floor in a building, with radiant hydronic heating fluid flowing through the ducts (2).
  • Figure 8 shows how the invention can be used, for example, in fire- prevention systems.
  • the slab (1 ) could form part of the ceiling of a building, and fire-inhibiting liquids or gases can be pumped under pressure through the ducts (2) and be forced out through, for example, sprinkler valves
  • the tendons are permanently in contact with the fluid to be circulated through the tendon ducts in the present invention.
  • a corrosion inhibiting agent can be added to the liquid in order to protect the tendons against corrosion due to chemical or electrolytic effects.
  • corrosion inhibitors may include volatile components which are adsorbed on to the steel of the tendon, for example, giving the surface of the metal an extra means of corrosion prevention, even if small pockets or bubbles of air remain trapped in the liquid.
  • the liquid in the duct can be inspected and treated or replaced easily, as can the tendons themselves. Corrosion prevention is also not compromised by movement in the structure which might otherwise cause small voids between a tendon and a solid grout. Such voids are undesirable because moisture may find its way into them and remain in the voids long enough to cause corrosion.
  • Another method of inhibiting corrosion in the system of the present invention is to applying a potential difference across the liquid in the duct, with the tendon acting as one electrode, and using a second electrode in contact with the liquid.
  • a potential difference can be used either to counter corrosive electrolytic effects or to deposit and maintain a corrosion-inhibiting coating on the tendon.
  • Bleed valves can be positioned at appropriate points along the ducting, so that any gases trapped in the liquid can be bled off easily, thereby improving the thermal efficiency of the fluid circulation system and also reducing the likelihood of corrosion of the tendons.
  • any chemical or electrolytic change, such as corrosion, of the tendons is also likely to be detectable from a chemical analysis of the fluids circulated, particularly if the fluid is a liquid. This provides an easy way of monitoring the tendons for corrosion without the need to remove the tendons or even to drain the system.
  • Additives may be added to the liquid, either continuously or at predetermined monitoring periods, to enhance the sensitivity of the analysis for detecting substances in the liquid whose presence could indicate corrosion in the system or to replace corrosion inhibitors used or lost over time.
  • the chemical composition of the fluid to be circulated can be selected depending on the function which the fluid is expected to perform.
  • Refrigerants can be used for cooling systems, for example. Water, a foaming agent, or carbon dioxide could be used for fire-prevention. Other substances may also be necessary, such as anti-freeze or corrosion inhibitors.
  • Sensors can be used to monitor the level, or the pressure, or the chemical composition, or other physical or chemical parameters of the fluid inside the ducts. Such sensors can in turn be used to signal out-of-tolerance conditions such as a drop in fluid level or pressure (due, for example, to a leak), or an unexpectedly high or low temperature (caused by fire or frost), or a change in flow-rate (caused by a blockage, for example).
  • the ducts used in for the present invention can be made of any suitable material, such as metal or plastics. Exceptionally, it is also possible to implement the ducts from the concrete itself, without using a separate material, by for example using a moulding form during casting and subsequently removing the moulding form.
  • the concrete in this case should be of sufficient density and composition to be impermeable to the fluid it should contain, unless it is desired to use the duct to convey a fluid which is intended to permeate the concrete.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Bridges Or Land Bridges (AREA)
  • Building Environments (AREA)

Abstract

La présente invention concerne un procédé, un système et un dispositif qui permettent à un écoulement de fluide pour un chauffage par le sol et analogues d'être réalisé en utilisant des conduites de post-tension (PT) qui sont normalement utilisées uniquement pour enfermer et protéger des câbles de post-tension. Dans une structure en béton précontraint (1), les conduites PT (2) sont utilisées en tant que conduite pour des fluides de service public et pour le guidage et la protection des armatures de PT (3). Une variante est également décrite, et utilise les conduites de PT (2) pour distribuer des fluides de lutte contre l'incendie dans l'ensemble d'un bâtiment. Le système peut être utilisé pour des bâtiments, des routes, des ponts, des pistes de décollage, ou une quelconque structure qui subit une post-tension et qui nécessite qu'un fluide soit transporté d'une partie de la structure (1) à une autre.
PCT/EP2010/053932 2010-03-25 2010-03-25 Système de conduites à fluide WO2011116825A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2010/053932 WO2011116825A1 (fr) 2010-03-25 2010-03-25 Système de conduites à fluide
AU2010349386A AU2010349386A1 (en) 2010-03-25 2010-03-25 Fluid ducting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/053932 WO2011116825A1 (fr) 2010-03-25 2010-03-25 Système de conduites à fluide

Publications (1)

Publication Number Publication Date
WO2011116825A1 true WO2011116825A1 (fr) 2011-09-29

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ID=43332709

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PCT/EP2010/053932 WO2011116825A1 (fr) 2010-03-25 2010-03-25 Système de conduites à fluide

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AU (1) AU2010349386A1 (fr)
WO (1) WO2011116825A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR750875A (fr) 1933-02-16 1933-08-21 Procédé et installation pour chauffer des constructions en béton armé
DE695137C (de) * 1937-09-04 1940-08-17 Anversoise Fonciere Et Ind Soc Verfahren zum Spannen der Bewehrungen von Baukoerpern aus Beton o. dgl. und Bewehrungen zur Durchfuehrung dieses Verfahrens
FR1309969A (fr) 1963-03-04
US3579931A (en) 1969-09-18 1971-05-25 Du Pont Method for post-tensioning tendons
EP0875636A1 (fr) 1997-05-02 1998-11-04 Freyssinet International (Stup) Câble de précontrainte, et élément de gaine pour un tel câble
US6631596B1 (en) * 2000-10-16 2003-10-14 Felix L. Sorkin Corrosion protection tube for use on an anchor of a post-tension anchor system
EP1512805A1 (fr) 2002-02-18 2005-03-09 Max Aicher Acier d'armature cannelé tubulaire, procédé de fabrication d'un acier d'armature cannelé tubulaire et utilisation d'un acier d'armature tubulaire
DE102007010924A1 (de) * 2007-03-05 2008-09-11 Bautevent Gmbh Betondeckenkonstruktion

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1309969A (fr) 1963-03-04
FR750875A (fr) 1933-02-16 1933-08-21 Procédé et installation pour chauffer des constructions en béton armé
DE695137C (de) * 1937-09-04 1940-08-17 Anversoise Fonciere Et Ind Soc Verfahren zum Spannen der Bewehrungen von Baukoerpern aus Beton o. dgl. und Bewehrungen zur Durchfuehrung dieses Verfahrens
US3579931A (en) 1969-09-18 1971-05-25 Du Pont Method for post-tensioning tendons
EP0875636A1 (fr) 1997-05-02 1998-11-04 Freyssinet International (Stup) Câble de précontrainte, et élément de gaine pour un tel câble
US6631596B1 (en) * 2000-10-16 2003-10-14 Felix L. Sorkin Corrosion protection tube for use on an anchor of a post-tension anchor system
EP1512805A1 (fr) 2002-02-18 2005-03-09 Max Aicher Acier d'armature cannelé tubulaire, procédé de fabrication d'un acier d'armature cannelé tubulaire et utilisation d'un acier d'armature tubulaire
DE102007010924A1 (de) * 2007-03-05 2008-09-11 Bautevent Gmbh Betondeckenkonstruktion

Also Published As

Publication number Publication date
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