EP3543418B1 - Verfahren zum verbinden von spanngliedern von vorgefertigten segmenten und resultierende struktur - Google Patents

Verfahren zum verbinden von spanngliedern von vorgefertigten segmenten und resultierende struktur Download PDF

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Publication number
EP3543418B1
EP3543418B1 EP18305330.5A EP18305330A EP3543418B1 EP 3543418 B1 EP3543418 B1 EP 3543418B1 EP 18305330 A EP18305330 A EP 18305330A EP 3543418 B1 EP3543418 B1 EP 3543418B1
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Prior art keywords
ducts
segments
recesses
segment
uhpfrc
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EP18305330.5A
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English (en)
French (fr)
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EP3543418A1 (de
Inventor
Paul Arthur Bottomley
Boris COUSIN
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Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Priority to EP18305330.5A priority Critical patent/EP3543418B1/de
Priority to US16/361,533 priority patent/US20190292785A1/en
Publication of EP3543418A1 publication Critical patent/EP3543418A1/de
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    • 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
    • E04C5/10—Ducts
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

Definitions

  • the present invention relates to the assembly of precast construction segments (PCS) for building pre-stressed structures such as post-tensioned concrete segmental structures.
  • PCS precast construction segments
  • These segments are preferably made in accordance with a match cast method to ensure a very closely fitting joint.
  • connection of ducts at the joint of two adjacent segments is exposed to a risk of infiltrations of various corroding substances such as deicing solutions and achieving a good seal at the joint if required.
  • grout is often injected into the ducts to create a mechanical bound between the tendons and the concrete of the segments and help protect the tendons from corrosion. This grout must not escape from the ducts during injection.
  • the joint between two consecutive segments can be made according to a so-called “dry joint” process where the segments are placed side by side without any interface product or according to a so-called “glued joint” process where an adhesive such as epoxy paste is introduced between the segments.
  • dry joint process where the segments are placed side by side without any interface product
  • glued joint process where an adhesive such as epoxy paste is introduced between the segments.
  • the sealing at the junction of ducts also needs to prevent the adhesive from penetrating into the ducts and hinder the further introduction of the tendons.
  • pneumatic tests are carried out to check the quality of the sealing before installing the tendons and injecting the grout. If leaks are detected in some ducts, the injection of grout is rendered more difficult and some extra work is needed to guarantee the tendons will be preserved from corrosion.
  • Some existing duct couplers are formed of many components and are expensive and complex to use.
  • FR-A-2 596 439 discloses a device to insert between sections of pre-stressing ducts, comprising a cylindrical sleeve engaged between the openings of two adjacent sections to ensure the continuity of the ducts, and an elastic seal surrounding the cylindrical sleeve to ensure sealing and compensate for the positioning variations and dimensional deviations of the adjacent segments which are assembled against each other.
  • WO 99/043910 discloses a device to engage in the ducts to connect the adjacent sections in a sealed manner.
  • An object of the present invention is thus to propose a simple and efficient solution to the problem of achieving a duct continuity that would pass the air tightness test mentioned above with repeatability and even in situations when the tendons are inclined in the webs.
  • a further object of the invention is to provide a solution that is reliable and easy to implement.
  • the invention achieves this goal thanks to a method according to claim 1 for establishing an air-tight connection between post-tensioning tendon ducts of two consecutive precast match cast segments of a structure, each segment being cast with a recess (also called a "box-out") opening out on a jointing face of the segment leaving an access to duct ends, the method comprising:
  • air tight connection it is meant a connection that passes a pneumatic test usually performed for testing the quality of the connection for this type of structure and preferably a connection that passes the 0,1bar test referred to above.
  • the sealing material is preferably a High Performance Concrete (HPC) and most preferably an Ultra High Performance Fibre Reinforced Concrete (UHPFRC).
  • HPC High Performance Concrete
  • UHPFRC Ultra High Performance Fibre Reinforced Concrete
  • UHPFRC provides an air-tight, long term durable "coupling" between the ducts which will not crack nor allow ingress of any contaminant due to its complete lack of porosity and extreme durability.
  • the method provides a simple way to obtain the air tightness connection at a similar or lower cost compared to the use of known couplers.
  • the invention allows obtaining an air tightness connection even for tendons that are significantly deviated at the joints.
  • connection of the duct ends of a pair at step a) does not need to provide air-tightness as if suffices it prevents ingress of the UHPFRC into the ducts during filling of the recesses with that material.
  • thermo-retractable sleeve that is pre-fixed on one of the duct ends of a pair of ducts.
  • the length of such sleeve ranges for example from 70 mm to 130 mm.
  • the sleeve is slid over and sealed onto the pair of ducts before UHPFRC is poured.
  • This sleeve is a non-structural element that aims to prevent ingress of the UHPFRC into the ducts when UHPFRC is poured into the recesses.
  • the sliding and sealing of the sleeve may take place or not after the tendons are threaded into the ducts.
  • an adhesive tape wounded around the duct ends may also be used.
  • the segments are deprived of reinforcement bars protruding out into the recesses, as the use of UHPFRC negates the need to reinforce the infill concrete connection.
  • Step b) may take place concurrently with tendon threading.
  • HPC concrete is a concrete with a compressive strength equal or exceeding 70 MPa.
  • UHPRFC concrete is a concrete with a compressive strength usually exceeding 150 MPa, and of at least 120 MPa.
  • the UHPRFC comprises fibres that ensure tensile strength with a ductile behavior.
  • the UHPRFC has a relatively high content of binder, which leads to the absence of capillary porosity.
  • the UHPRFC has a dense matrix.
  • the water/binder ratio (w/b) of UHPFRC typically lies between 0,16 and 0,2.
  • the recesses are provided in a lower slab and/or an upper slab of the segments and open out into the top surface of the lower slab and/or upper slab. These recesses may be adjacent the lateral walls (also called "webs") of the segments.
  • the segments are made using match casting technique.
  • the segments may be box segments, for example one-cell box segments.
  • the method may comprise testing the air-tightness of the connection of the ducts.
  • the method comprises the following steps for casting the segments (10):
  • the reinforcing bars may be curtailed so as not to extend within the recesses.
  • a further aspect of the invention is a method according to claim 13 for building a segmental structure comprising assembling precast match cast segments, with match cast joints, in the continuity of each other, each segment comprising post-tensioning tendon ducts, the method comprising implementing the method as defined above for connecting the ducts.
  • a further aspect of the invention is a segmental structure according to claim 14, made in accordance with the method as defined above, preferably a bridge deck, comprising at least two precast match cast segments incorporating ducts in which tensioning tendons are threaded, the ducts being connected together at the joint of the segments by at least one block of a sealing material, preferably Ultra High Performance Fibre Reinforced Concrete (UHPFRC), extending around duct ends of the two adjacent segments, this block extending into adjacent recesses of the segments each opening out on a jointing face of the segments.
  • UHPFRC Ultra High Performance Fibre Reinforced Concrete
  • the joint between the two consecutive segments preferably comprise two such blocks. These blocks preferably each extend inwardly of the adjacent lateral wall (or web) of the segments, in the bottom slab. The blocks preferably open out on top of the bottom slab, in the corner thereof.
  • segmental structure 1 such as a bridge deck made of several precast segments 10 with match-cast coupling surfaces.
  • Each segment 10 is in this example a one-cell box concrete segment comprising a bottom slab 11, two symmetrically inclined lateral walls (or webs) 12 and a top slab 13 extending in cantilever fashion beyond the walls (or webs) 12 to define a width of the bridge deck.
  • each segment 10 is delimited by a rear face 14 and a front face 15.
  • the rear face 14 is intended to come into contact against the front face 15 of the previous segment installed on the structure during construction.
  • the front face 15 of each segment 10 is intended to receive the rear face 14 of the next segment 10.
  • the jointing faces 14, 15 of the adjacent segments 10 are provided with a number of interlocking reliefs 17 ensuring a good shear resistance of the joint and helping relative positioning of the segments as well when they are brought together.
  • these reliefs 17 are located on the end faces of the lateral walls (or webs) 12 of the segments 10.
  • the interlocking reliefs 17 may comprise raised keys each in the shape of a rectangular prism with tapered sides to provide mechanical interlock for accurate location and shear resistance.
  • the segments 10 are match cast, which means that when casting a segment, the jointing face is match cast against its previously cast mating segment so that this segment can act as a former or as part of the mould for this new segment.
  • Each segment 10 comprises a number of longitudinal tendon ducts 20, intended to receive post tensioning tendons. These tendons are anchored at their ends by means of any appropriate anchoring devices (not shown).
  • the ducts 20 are connected through blocks 30 of a sealing material that prevents ingress of corrosive substances and provides mechanical resistance.
  • this sealing material is UHPFRC.
  • the blocks 30 extend at the joint of two consecutive segments 10 on the bottom slab 11 near the lateral walls (or webs) 12.
  • Each segment 10 is cast with a recess 40 opening out in the jointing face of the segment 10 and in the top face of the bottom slab 11, as shown in FIG.6 .
  • an insert (not shown) with appropriate shape is placed in the mould used to cast the segment 10. This insert is preferably reusable.
  • the bottom slab 11 comprises reinforcing bars (not shown) but these bars are curtailed not to extend into the recess 40. This facilitates the casting thereof.
  • each recess 40 may taper inwardly going upward as shown in FIG.7A . This helps retain the block 30 in the bottom slab 11, as the two rear faces 43 converge upward.
  • the outer side face 44 of the recess 40 may extend in the continuity and alignment of the inner face of the adjacent wall (or web) 12, as shown in FIG.3 .
  • thermo-retractable sleeve 21 may be pre-fixed (for example threaded or installed otherwise) on one duct end of each pair, as shown, and slid over the other duct end as shown in FIG.7B . Then the sleeve 21 is sealed on the ducts 20. This connection prevents ingress of UHPFRC into the ducts 20.
  • UHPFRC is then poured into the space 47 to fill in the recesses 40 and make the block 30 extending around the duct ends 20, as shown in FIG.7C .
  • UHPFRC is expected to reach a strength of far more than 50 MPa in less than 24 hours and exhibit a stiffness at least equal to that of equivalent strength normal concrete so the stressing operation is not impacted.
  • the filling in of the recesses 40 takes place concurrently with tendon threading inside the ducts.
  • Each block 30 connects the incorporated ducts 20 in an air-tight fashion and enables the connection to pass the 0,1 bar pneumatic test defined above. Furthermore, each block 30 provides the required mechanical resistance at the junction.
  • Each block 30 may have a depth d 7 (measured along the longitudinal axis of the structure) ranging between 150 and 350 mm, for example of about 250 mm.
  • the thickness d 1 of UHPFRC extending below the ducts 20 may range from 40 to 60 mm, being for example of about 50 mm.
  • the thickness d 2 of the bottom slab 11 below each recess 40 may range from 25 to 35 mm, being for example of about 30 mm.
  • the thickness d 3 of UHPFRC above the ducts 20 where the blocks 30 are thinner, i.e. at their inner side, may range from 75 to 85 mm, being for example of about 80 mm.
  • the width d 4 of the blocks 30 may range from 750 to 1250 mm, being for example of about 1050 mm.
  • the blocks 30 may have a bottom face 41 that is inclined downwards toward the jointing face.
  • the upper edge of the face 41 may be spaced from the ducts 20 by a distance d 6 as shown in FIG.5 that ranges from 15 to 25 mm, being for example of about 20 mm.
  • the thickness d 5 of UHPFRC at the lower edge of face 41 below the ducts 20 is higher and may range from 50 to 60 mm, being for example of about 55 mm.
  • the volume of infill UHPFRC may be about 0.2 m 3 per joint and may be prepared easily on site.
  • the invention applies to other segmental structures, for example to two-cell box segments 10.
  • tendon ducts may be provided elsewhere on the segments, for example in the top slab and/or in the lateral walls (or webs).
  • the number of pairs of ducts 20 connected by each block 30 may vary.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Claims (14)

  1. Verfahren zum Aufbauen einer luftdichten Verbindung zwischen vorgespannten Spannkanälen (20) mit nachträglichem Verbund zweier aufeinanderfolgender vorgefertigter aneinanderbetonierter Segmente (10) einer Struktur, wobei das Verfahren dadurch gekennzeichnet ist, dass jedes Segment (10) mit einer Aussparung (40) betoniert ist, die sich auf einer Verbindungsseite (14; 15) des Segments öffnet, und Zugriff auf die Enden der Kanäle (20) zulässt, wobei das Verfahren Folgendes umfasst:
    a) Verbinden von Paaren jeweiliger Kanalenden (20) der zwei aufeinanderfolgenden Segmente (10) miteinander und
    b) Gießen eines Dichtungsmaterials in die Aussparungen (40) der zwei aufeinanderfolgenden Segmente um die Kanalenden (20), während verhindert wird, dass Material in den Zwischenraum der Kanäle eintritt, wodurch eine luftdichte Verbindung an der Verbindungsstelle der Kanäle ausgebildet wird.
  2. Verfahren nach Anspruch 1, wobei das Dichtungsmaterial Ultrahochleistungs-Faserbeton (UHPFRC) ist.
  3. Verfahren nach einem der Ansprüche 1 und 2, wobei die Segmente (10) keine Bewehrungsstäbe aufweisen, die in die Aussparungen (40) hinein vorstehen.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei eine thermisch einziehbare Hülse (21) an einem der Kanalenden (20) eines Kanalpaars vorfixiert ist, insbesondere damit verschraubt oder anderweitig installiert ist, wobei die Länge der Hülse (21) vorzugsweise von 70 mm bis 130 mm reicht, und wobei die Hülse (21) anschließend über das Kanalpaar (20) geschoben und damit verschweißt wird.
  5. Verfahren nach einem der Ansprüche 1 bis 3, wobei ein aufblasbarer Schlauch oder ein aufblasbarer Ball in die Kanäle eingeleitet und aufgeblasen wird, bevor das Dichtungsmaterial vergossen wird, um den inneren Teil der Verbindung zwischen den Kanälen einzuschließen.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei: Schritt b) zeitgleich mit dem Einschrauben des Spannglieds stattfindet.
  7. Verfahren nach einem der Ansprüche 1 bis 6, wobei die Aussparungen (40) in einer unteren oder oberen Platte (11) der Segmente (10) vorgesehen sind und in die Deckfläche der unteren oder oberen Platte (11) geöffnet sind.
  8. Verfahren nach Anspruch 7, wobei die Aussparungen (40) an die seitlichen Wände (12) der Segmente (10) angrenzen.
  9. Verfahren nach einem der Ansprüche 1 bis 8, wobei die Segmente (10) Kastensegmente sind.
  10. Verfahren nach einem der Ansprüche 1 bis 9, das Testen der Luftdichtigkeit der Verbindung der Kanäle umfassend.
  11. Verfahren nach einem der Ansprüche 1 bis 10, wobei das Gießen der Segmente (10) Folgendes umfasst:
    a) Anordnen in einer Form:
    o von Kanälen (20) zum Durchführen der Spannglieder,
    o von Einsätzen zum Ausbilden der Aussparungen (40), in die sich die Enden der Kanäle erstrecken,
    o von Bewehrungsstäben,
    b) Gießen von Beton in die Form.
  12. Verfahren nach Anspruch 11, wobei: die Bewehrungsstäbe gekürzt sind, um sich nicht in die Aussparungen (40) hinein zu erstrecken.
  13. Verfahren zum Bauen einer Segmentstruktur (1), das aufeinanderfolgende Montieren von vorgefertigten aneinanderbetonierten Segmenten (10) mit aneinanderbetonierten Verbindungen umfassend, wobei jedes Segment (10) vorgespannte Spannkanäle (20) mit nachträglichem Verbund umfasst, wobei das Verfahren das Umsetzen des Verfahrens nach einem der Ansprüche 1 bis 10 zum Verbinden der Kanäle (20) umfasst.
  14. Segmentstruktur (1), die nach Anspruch 13 gefertigt wurde, vorzugsweise eine Brückenfahrbahn, die mindestens zwei vorgefertigte aneinanderbetonierte Segmente (10) umfasst, die Kanäle (20) enthalten, in die Spannglieder eingeschraubt sind, wobei die Kanäle (20) an der Verbindung der Segmente (10) über mindestens einen Block (30) aus Ultrahochleistungs-Faserbeton (UHPFRC) miteinander verbunden sind, der sich um die Kanalenden (20) der zwei aneinander angrenzenden Segmente erstreckt, wobei sich der Block in angrenzende Aussparungen (40) der Segmente erstreckt, die sich auf einer Verbindungsseite (14; 15) der Segmente öffnen.
EP18305330.5A 2018-03-23 2018-03-23 Verfahren zum verbinden von spanngliedern von vorgefertigten segmenten und resultierende struktur Active EP3543418B1 (de)

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EP18305330.5A EP3543418B1 (de) 2018-03-23 2018-03-23 Verfahren zum verbinden von spanngliedern von vorgefertigten segmenten und resultierende struktur
US16/361,533 US20190292785A1 (en) 2018-03-23 2019-03-22 Method for connecting precast segments tendon ducts and resulting structure

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EP18305330.5A EP3543418B1 (de) 2018-03-23 2018-03-23 Verfahren zum verbinden von spanngliedern von vorgefertigten segmenten und resultierende struktur

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KR101989167B1 (ko) * 2018-11-23 2019-09-30 한국건설기술연구원 이중웨브를 이용한 중공형 합성보 및 그 시공방법
JP7428613B2 (ja) 2020-08-20 2024-02-06 三井住友建設株式会社 プレキャストコンクリート壁内埋設管の継手部材及びその使用方法

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