EP3234276A1 - Element precontraint et procede de fabrication d'un element precontraint - Google Patents
Element precontraint et procede de fabrication d'un element precontraintInfo
- Publication number
- EP3234276A1 EP3234276A1 EP15820452.9A EP15820452A EP3234276A1 EP 3234276 A1 EP3234276 A1 EP 3234276A1 EP 15820452 A EP15820452 A EP 15820452A EP 3234276 A1 EP3234276 A1 EP 3234276A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- prestressed
- mold
- filling material
- prestressed element
- prestressing
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000463 material Substances 0.000 claims abstract description 95
- 239000004567 concrete Substances 0.000 claims abstract description 27
- 230000002787 reinforcement Effects 0.000 claims abstract description 27
- 239000000945 filler Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 12
- 210000002435 tendon Anatomy 0.000 claims description 7
- 239000004574 high-performance concrete Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 3
- 230000036316 preload Effects 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920006253 high performance fiber Polymers 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011374 ultra-high-performance concrete Substances 0.000 description 2
- 230000009172 bursting Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
-
- 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
Definitions
- the present invention relates to an elongate prestressed element defining two opposite ends, made in at least one filler material, in particular concrete, and through which at least one prestressing reinforcement extends between said two ends and is embedded in said filler material. .
- the present invention also relates to a method of manufacturing such a prestressed element.
- Prestressed elements such as beams, beams, lintels, etc. are generally made by molding a filler material such as concrete and are associated with prestressing reinforcements extending in their length to increase the mechanical strength properties of the concrete and in particular the flexural strength. Given their mechanical properties, these prestressed elements are particularly suitable for the realization of structures subject to significant constraints, such as bridges, buildings, and all types of structures and constructions in the field of construction. civil and building engineering. Conventionally, a prestressed element comprises prestressing reinforcements embedded in concrete to apply to this element a prestressing in the longitudinal direction of said element.
- prestressing tendons are stretched by their respective ends, for example, by means of jacks, headers, or the like.
- This is called prestressed element by "pre-tension", the tensioning of the reinforcements taking place before the concrete filling.
- the tension exerted on the prestressing tendons is released, which has the effect of constraining the molded element in its length.
- the distribution of the stress is however not uniform over the entire length of the prestressed element. More particularly, the mechanical strength is not optimal in the end zones of the prestressed element. This is explained by the fact that the prestress is transmitted gradually to the concrete.
- CN publication 102493660 B discloses an anchor tube which is traversed by an armature and which is filled with an ultra-high performance cementitious composite material.
- the armature is fixed in the tube by means of a first plate and a second plate parallel to each other and spaced apart from each other, which delimit between them a space containing the composite material.
- the present invention aims at overcoming these drawbacks by proposing a prestressed element whose mechanical strength is optimized in particular at at least one of its end zones, so as to form an anchor zone which is restricted size with respect to the length of the prestressed element and which is as short as possible to reduce the length of the prestressed element to be embedded.
- the invention relates to a prestressed element of the type indicated in the preamble, characterized in that it comprises at least one interface piece traversed by said armature and delimiting at least in part an end zone of said prestressed member by relative to a main part of said prestressed element, and in that on the one hand said end zone of said prestressed element comprises at least partly a second filling material and, on the other hand, said main part of said prestressed element comprises a first filling material, the second filling material having a higher tensile and compressive strength than the first filling material.
- the mechanical strength in the end zone is thus increased, which makes it possible to increase the mechanical strength at the end of the prestressed element.
- the second filling material having a tensile and compressive strength greater than that of the first filling material is thus used in a limited quantity which makes it possible to reduce the manufacturing cost of the prestressed element.
- it comprises an interface piece in the form of a plate disposed perpendicularly to the longitudinal axis of said prestressed member and whose section corresponds to the section of said prestressed member and delimiting said end zone of said prestressed member.
- said main portion of said prestressed member and said end portion includes said second filler material.
- the prestressed element may have a substantially parallelepipedal shape and may comprise a plurality of prestressing reinforcements which extend between said ends of the prestressed element and which are parallel to one another.
- Said plate may comprise a plurality of openings arranged to be traversed respectively by one of said prestressing frames.
- Said plate may consist of a perforated plate or a grid. According to another preferred embodiment, it comprises two interface pieces in the form of a plate disposed perpendicularly to the longitudinal axis of said prestressed element whose section corresponds to the section of said element and delimiting respectively two end zones of said prestressed element. relative to said main portion and said end regions include said second filler material. In a preferred embodiment, it comprises at least one interface piece in the form of a shrink tube extending in said at least one end zone and traversed by said frame, said hooping tube comprising said second filling material, and the first filling material coats, on the one hand, said prestressing reinforcement in said main part and, on the other hand, said hooping tube in said end zone.
- it may comprise at least one hooping frame disposed around said hooping tube.
- the hooping tube may be a cylinder and said prestressing frame and said hooping tube may be substantially coaxial.
- the shrink tube may comprise a vent and a filling orifice, and is closed at each of its ends by a plate.
- the prestressed member may comprise a plurality of parallel shrinking tubes between them and arranged along the longitudinal axis of the prestressed member and said shrinking tubes may be surrounded by a plurality of hooping frames parallel to each other and perpendicular to the longitudinal axis of the prestressed member.
- the first filling material may comprise conventional concrete and the second filling material may comprise so-called high performance concrete or so-called high performance concrete or ultra-high performance concrete.
- the second filler material may comprise fibers or at least one hooping frame.
- At least one interface piece arranged to be traversed by at least one prestressing reinforcement in the mold and defining at least one end zone of the mold with respect to a main part of the mold
- At least one prestressing reinforcement is provided in the mold through the interface piece
- a second filling material is cast at least in part into the end zone of the mold delimited by said interface piece, and a first filler material is cast at least in the main part of the mold,
- At least one interface piece in the mold is provided in the form of a plate perpendicular to the longitudinal axis of the mold and the second filling material is cast in the zone d end of the mold defined by said plate and the first filling material is cast in the main part of the mold.
- a plate which has a plurality of openings in the mold for delimiting an end zone of the mold relative to a main part of the mold
- prestressing tendons are arranged in the mold through said openings of the plate,
- a second filling material in the end zone of the mold there is at least one interface piece in the form of a shrink tube parallel to the longitudinal axis of the mold and which extends in the end zone of the mold.
- said second filling material is cast into said shrink tube through a filling orifice and said first filling material is cast on the one hand into the end zone of the mold around said shrink tube and secondly in the main part of the mold.
- FIG. 1 represents a perspective view of a prestressed element according to a first embodiment of the invention of which only one end zone is shown, and
- Figure 2 is a view similar to Figure 1 of a prestressed member according to a second embodiment of the invention of which only one end zone is shown.
- the invention relates to a prestressed element 10a, 10b according to the invention made of at least two types of filling material 2, 3 different and having at least one prestressing frame 40.
- the prestressed element 10a, 10b may consist, for example, of a beam, a post, a slab element, a lintel.
- An interface piece 50a, 50b makes it possible to delimit at least part of an end zone 11 of the prestressed element 10a, 10b of its main part 12, and is crossed by the prestressing armature 40.
- the filling materials, called the first filling material 2 and the second filling material 3 may consist of different types of concrete.
- the second filling material 3 has a mechanical strength, and in particular a higher tensile and compressive strength than that of the first filling material 2.
- the second filling material 3 may consist of a concrete said high performance or very high performance concrete or concrete said ultra-high performance.
- the second filling material 3 may also comprise fibers, for example, metal or polymeric fibers or a mixture of both. The addition of fibers makes it possible to further increase the tensile strength of the second filling material 3.
- the second filling material 3 may comprise hooping frames, which will be described later, and / or fibers to increase the tensile strength.
- the second filling material 3 may be an ultra-high performance fiber concrete comprising metal fibers.
- the first filling material 2 may consist of a so-called conventional concrete. In general, conventional or ordinary concrete forming the first filling material 2 has a compressive strength of between 16 to 80 MPa.
- the high performance, ultra high performance, high performance concretes which can form the second filling material 3 have a compressive strength of between 65 and 250 MPa.
- a high performance fiber reinforced concrete having metal fibers has a compressive strength of between 150 MPa and 250 MPa.
- the prestressing frame 40 may consist of a linear part such as a cable or a strand or a bar. It is preferably made of metal, with a high elastic limit.
- the prestressing frame 40 is arranged to be energized, by means of tensioning, for example, by means of jacks, then to be released and transmit the tension to the filling material 2, 3. It comprises two opposite ends 41 corresponding to the ends of the prestressed member and extends parallel to the longitudinal axis of said prestressed member.
- an element is prestressed by a plurality of prestressing tendons arranged parallel to each other and evenly distributed or not within the element according to the constraints to be supported.
- the interface piece may consist in a first embodiment of a plate 50a.
- the surface of the plate 50a substantially corresponds to the section of the prestressed element 10a.
- the plate 50a has a plurality of openings 51a arranged to be traversed respectively by a preload reinforcement 40.
- the plate 50a is made of a metal type expanded metal ® sparing openings 51a for the passage of four prestressing plates 40.
- the plate 50a may also consist of a perforated plate or a mesh.
- the interface piece may also consist of a hooping tube 50b which will be described below with reference to FIG. 2.
- the prestressed element 10a has a shape substantially parallelepipedic and comprises four prestressing plates 40 which extend between the ends 13 of the prestressed element 10a and are parallel to each other.
- the present invention may comprise one or a plurality of prestressing frames, and is not limited to this variant.
- the plate-shaped interface piece 50a delimits an end zone 11 of the prestressed element 10a with respect to a main portion 12.
- the plate 50a does not extend into the end zone 11 of the element prestressed. In this configuration, the end zone 11 is delimited by the end 13 of the prestressed element 10a and by the plate 50a disposed perpendicularly to the longitudinal axis of the prestressed element 10a.
- the main part 12 is delimited by the opposite end (not shown) of the prestressed element 10a and by the plate 50a.
- the prestressed element may also comprise a second plate disposed near the opposite end and which delimits a second end zone, the first plate delimiting a first end zone according to the previous variant.
- the main part is also central and is delimited on the one hand by the first plate and on the other by the second plate.
- the plate 50a has a plurality of openings 51 traversed respectively by at least one prestressing reinforcement 40.
- the main part 12 of the prestressed element 10a comprises a first filling material 2 and the end zone 11 of the prestressed element 10a comprises a second filling material 3.
- the quantity of the first filling material 2 is greater than the amount of second material 3 in the prestressed member 10a.
- the prestressed element has a first and a second end zone, these each comprise the second filler material.
- the first and second filling materials 2, 3 encase the prestressing plates 40.
- the use of a second filling material 3 in one of the end zones 11 makes it possible to increase the mechanical strength in this zone of end 11. It also makes it possible to compensate for the decrease in the prestress occurring in this end zone 11.
- the second filling material may comprise fibers or hooping frames as explained below.
- the prestressed element 10a is particularly suitable for forming a pole intended to be placed in a concrete vault foundation at its reinforced end zone 11. Indeed, the high mechanical resistance the end zone 11 of the prestressed element 10a with respect to a pre-stressed element of the prior art makes it possible to reduce the embedding height of the foundation, also contributing to reducing the costs and time of implementation.
- the prestressed element 10b also has a substantially parallelepipedal shape and comprises at least one prestressing frame 40 and in this example four, without this number being limiting, which extends between the ends 13 of the prestressed element 10b.
- the prestressing frame 40 is provided at one of its ends 41 with an interface piece in the form of a hooping tube 50b.
- FIG. 2 illustrates four hooping tubes 50b parallel to each other and arranged parallel to the longitudinal axis of the prestressed element 10b. These hooping tubes 50b delimit the end zone 11 of the prestressed member 10b with respect to its main portion 12. In addition, they extend and are incorporated in the end zone 11.
- Each hooping tube 50b is closed at each of its ends by a plate 52b which has openings 51b arranged to allow the passage of a prestressing frame 40. It further comprises a vent 53b and a filling orifice 54b arranged to allow the injection of the second material 3.
- the hooping tubes 50b are surrounded by hooping frames 55b arranged parallel to each other and perpendicular to the longitudinal axis of the element to ensure their relative positioning and their retention in the mold during the manufacture of said element.
- the hooping tubes 50b and the hooping frames 55b combined with the second filling material 3 further increase the tensile strength in the end zone 11, so that the splitting and splitting forces associated with the Introduction of the prestressing can be taken up by the second filling material 3 and the hooping tubes 50b and the hooping frames 55b. This results in an improvement in the mechanical strength of the prestressed element 10b in the end zones 11 and a decrease in the amount of second filling material 3 necessary to obtain a reasonable manufacturing cost. Possibilities of industrial application:
- the invention achieves the goals set, namely to provide a prestressed member whose mechanical strength is improved in at least one of its end zones.
- the prestressed element 10a, 10b can, for example, find an application in the field of building or civil engineering.
- a preloaded element 10a by pre-tensioning of filling material, in particular of concrete with prestressing reinforcements 40 according to the first embodiment of the present invention with reference to FIG. 1, can be obtained by implementing the following process steps:
- At least one optional reinforcement is provided (not shown) in a mold
- a plate 50a which has a plurality of openings 51a in the mold for delimiting an end zone of the mold with respect to a main part of the mold,
- prestressing plates 40 are arranged in the mold through the openings 51a of the plate 50a,
- a first filling material 2 is poured into the main part of the mold
- the pre-stressed element 10a obtained is demolded.
- a first plate which delimits a first end zone at a first end of the mold
- a second plate which delimits a second zone of end at the other end of the mold.
- the prestressed element 10b with reference to FIG. 2 can be obtained by implementing the following method steps:
- At least one reinforcement (not shown) is arranged in a mold
- hooping tubes 50b closed at their ends by plates 52b which has an opening 51b, at one end of the mold defining at least one end zone of the mold relative to a main portion of the mold,
- a hooping frame is provided around the hooping tubes 50b,
- prestressing plates 40 are arranged in the mold M through the shrinking tubes through the openings 51b of the plates 52b,
- a second filling material 3 is poured into the shrinking tubes 50b by their filling orifices 54b,
- a first filling material 2 is poured into the main part of the mold and around the hooping tubes 50b,
- the tension of the prestressing reinforcements 40 is released after the first and second filling materials 2 and 3 have hardened.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL15820452T PL3234276T3 (pl) | 2014-12-15 | 2015-12-10 | Element sprężony i sposób wytwarzania elementu sprężonego |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1462417A FR3029952B1 (fr) | 2014-12-15 | 2014-12-15 | Element precontraint et procede de fabrication d'un element precontraint |
PCT/EP2015/079220 WO2016096592A1 (fr) | 2014-12-15 | 2015-12-10 | Element precontraint et procede de fabrication d'un element precontraint |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3234276A1 true EP3234276A1 (fr) | 2017-10-25 |
EP3234276B1 EP3234276B1 (fr) | 2019-04-24 |
Family
ID=52684410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15820452.9A Active EP3234276B1 (fr) | 2014-12-15 | 2015-12-10 | Element precontraint et procede de fabrication d'un element precontraint |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3234276B1 (fr) |
FR (1) | FR3029952B1 (fr) |
PL (1) | PL3234276T3 (fr) |
WO (1) | WO2016096592A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB707144A (en) * | 1951-02-26 | 1954-04-14 | Stressed Concrete Design Ltd | Improvements in or relating to the construction of pre-stressed concrete |
DE1659131C3 (de) * | 1967-12-22 | 1974-09-05 | Intercontinentale-Technik Gesellschaft Fuer Planung Und Konstruktion Mbh, 8000 Muenchen | Spannglied verankerung für Betonbauteile und Verfahren zu ihrer Anwendung |
DE102007021690A1 (de) * | 2007-05-09 | 2008-11-27 | Viet Tue, Nguyen, Prof. Dr.-Ing.habil | Verfahren zur Herstellung neuer Verankerungen für im Verbund liegende Spannglieder beim Bauen im Bestand |
KR101146586B1 (ko) * | 2009-12-08 | 2012-05-16 | 한국건설기술연구원 | 초고성능 콘크리트를 이용한 긴장재 정착블록 및 이를 구비한 프리스트레스트 콘크리트 부재 |
CN102493660B (zh) * | 2011-12-30 | 2014-01-01 | 湖南大学 | 一种碳纤维增强复合材料预应力筋的锚固方法及锚具 |
-
2014
- 2014-12-15 FR FR1462417A patent/FR3029952B1/fr not_active Expired - Fee Related
-
2015
- 2015-12-10 WO PCT/EP2015/079220 patent/WO2016096592A1/fr active Application Filing
- 2015-12-10 PL PL15820452T patent/PL3234276T3/pl unknown
- 2015-12-10 EP EP15820452.9A patent/EP3234276B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
FR3029952B1 (fr) | 2018-03-02 |
PL3234276T3 (pl) | 2019-10-31 |
WO2016096592A1 (fr) | 2016-06-23 |
EP3234276B1 (fr) | 2019-04-24 |
FR3029952A1 (fr) | 2016-06-17 |
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